Message Logger: show logged edits and deletions from telegram-panel [no bump]

Keeps deleted messages (75% opacity, red icon-pack trash icon), restores
logged messages deleted while away, reports deletions, and shows edit
history as a mock chat (Edit history in the message menu, Open topic).
Message links and history open as any signed-in account with access.
Per-master API tokens; chat state synced per checked range with an hour's
validity, cached in SQLite with a configurable lifetime.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -1,4 +1,40 @@
-# exteraGram Plugin Base
+# Message Logger (exteraGram plugin)
+
+Shows what a [telegram-panel](../../telegram-panel) message logger saved, natively in chats:
+
+- messages others delete stay (the delete updates are dropped), at 75% opacity with a red trash
+  icon (from the active icon pack) in the time row, and are reported to the server;
+- logged messages deleted while the app was closed (or never seen deleted by the server, e.g.
+  bot-logged chats) are confirmed with Telegram, reported, and restored from the logger copy;
+- *Edit history* in the message menu (right above Forward, for edited messages) opens every
+  version as a mock chat — also on the logger groups' own posts — with an *Open topic* button
+  for the history topic in the activity group. Versions and their media are read from the activity group through
+  a signed-in account that can (the current one, the master, or any member); otherwise the
+  server's text is shown and media are marked unavailable;
+- message links into a chat the current account isn't in (e.g. a log post's "Message" link)
+  open that chat as a signed-in account that is in it; going back returns to your account.
+  Every signed-in account's chats are cached client-side for this.
+
+The server only points at copies (logger/activity group message ids); the client reads them
+through its own session, so the account must be a member of those groups.
+
+The server is asked about a chat only when needed: when it wasn't checked within the last hour
+(from the oldest loaded message on; the answer replaces the chat's cached marks), when older
+history is loaded past the checked range (that part only), or after an edit/delete event in the
+chat. Answers hold at most 100 marks (edited/deleted) and 100 missing ids, newest first. Marks
+are cached per chat in the plugin's SQLite (`state.db`, no size cap), so a chat opened again —
+even offline — shows them at once, and deleted messages are restored from the cache. An expired
+chat keeps its cache until the next successful check, which replaces it and starts over. Cached
+answers older than *Cache lifetime* (1/7/30/90/365 days or never; 30 by default) are removed,
+checked once a day (from local midnight) and when the setting changes.
+
+Setup: in the panel create a token per master — the account owning the logger groups —
+(Settings → API Tokens); in the plugin settings enter the panel URL and the tokens (separated by
+spaces), then *Test connection*. Any Telegram account can use a token. Diagnostics: see `docs/sdk-notes.md` (gotchas section).
+
+The rest of this README describes the build toolchain this repo came from (pluginBase).
+
+## Plugin base toolchain
 
 A build toolchain and ADB automation for writing [exteraGram](https://exteragram.app) plugins
 as ordinary multi-file Python projects instead of hand-maintaining one giant `.py` file.

docs/sdk-notes.md

@@ -112,3 +112,42 @@ The official structured plugin format (Elyx/ElyxBuilder) is a real alternative t
 This repo's bundler instead compiles a normal multi-file `src/` project down to the one
 `.plugin` file the base engine already knows how to load, so the dev-server write/reload loop
 works from the first deploy with no extra on-device engine.
+
+## Gotchas found on exteraGram 12.10.6 (message_logger)
+
+- **Java number boxing.** A Python `int` passed where Java takes `Object`, or to an overloaded
+  method, becomes a `Long` — even the result of `Integer.valueOf()`. Use `java.jint` /
+  `jfloat` explicitly: `ArrayList<Integer>` for `TL_*_getMessages.id` (a `Long` there fails
+  serialization on the network thread and the request silently never answers),
+  `Paint.setColor` (an `int` otherwise picks the `setColor(long)` ColorSpace overload),
+  reflective `Method.invoke` arguments, and replacing `param.args[i]` in hooks.
+- **Requests.** `client_utils.send_request` did not invoke the callback for these requests;
+  `ConnectionsManager.getInstance(account).sendRequest(req, RequestDelegate)` with a
+  `dynamic_proxy(RequestDelegate)` kept strongly referenced works (`src/tg.py`).
+- **Logs.** This device's logcat is silenced; `src/diag.py` mirrors to
+  `…/files/exteraGram/exteraGram Files/message_logger/diag.log` (readable over `adb shell cat`).
+- **Deploys.** `devclient.py deploy --enable` only enables; an already enabled plugin needs a
+  deploy without `--enable` (which reloads) to pick up a new build.
+- **Adding messages to an open chat.** Inserting into `ChatActivity.messages` directly (not in
+  `messagesDict`) breaks later arrivals in that chat; the private
+  `ChatActivity.processNewMessages(ArrayList, boolean)` places messages (also older ones) and
+  keeps the app's dicts and adapter consistent.
+- **Cell height.** Changing a `ChatMessageCell`'s measured height grows its bubble; after the
+  state behind it changes, `forceLayout()` the cell and `chatAdapter.notifyItemChanged(...)`,
+  or the list keeps stale positions. Item animators reset cell alpha: scale it in a
+  `setAlpha` before-hook instead of setting it once.
+- **Icon packs.** exteraGram applies icon packs through the activity's `ExteraResources`
+  (`getDrawableForDensity`); the application context's plain `Resources` and
+  `ColoredImageSpan(int)` give stock icons. Load drawables from
+  `get_last_fragment().getParentActivity().getResources()`.
+- **Another account's chat.** `BaseFragment.setCurrentAccount(slot)` before `presentFragment`
+  opens e.g. a `ChatActivity` as another signed-in account without switching accounts.
+- **Links.** Tapped links go through `org.telegram.messenger.browser.Browser.openUrl` (8 overloads,
+  the second argument a `Uri` or `String`); `adb shell am start -d URL` needs `-p <package>`.
+- **Message menu rows.** `MenuItemData` items land in the menu's Plugins folder, and options
+  added to `ChatActivity.fillMessageMenu`'s lists are dropped by exteraGram. A row in the main
+  menu is an `ActionBarMenuSubItem` inserted into the built popup after `createMenu` (whose
+  overloads call one another: insert once); `selectedObject` is the message.
+- **Topics as another account.** `ForumUtilities.openTopic` uses the presenting fragment's
+  account; do its steps yourself (`TopicsController.findTopic`/`loadTopic`, `ChatActivity`
+  with `setCurrentAccount` then `setThreadMessages`) — see `src/views/open_as.py`.

plugin.json

@@ -1,11 +1,11 @@
 {
-  "id": "hello_bundle",
+  "id": "message_logger",
-  "name": "Hello Bundle",
+  "name": "Message Logger",
-  "description": "Multi-file exteraGram plugin built by tools/bundle.py",
+  "description": "Shows deleted and edited messages and their edit history from your telegram-panel message logger.",
-  "author": "@yourhandle",
+  "author": "@lyuksovannyy",
-  "version": "1.0.0",
+  "version": "0.1.0",
   "icon": "exteraPlugins/1",
   "app_version": ">=12.5.1",
   "sdk_version": ">=1.4.4.3",
-  "requirements": []
+  "requirements": ["requests"]
 }

src/accounts.py

@@ -0,0 +1,162 @@
+"""Every signed-in account and the chats it has, cached client-side, to find
+an account that can open a chat the current one isn't in.
+
+Each account's dialogs come from its own database (`dialogs` table, read on
+its storage queue); membership is confirmed against the chat itself before
+use, since a dialog can outlive leaving a channel.
+"""
+
+import threading
+import time
+
+import diag
+
+_REFRESH_SECONDS = 600
+_lock = threading.Lock()
+_dialogs = {}  # account slot -> set of dialog ids
+_loaded_at = 0.0
+_Query = []
+
+
+def signed_in():
+    """[(slot, telegram user id)] of every signed-in account."""
+    from org.telegram.messenger import UserConfig
+
+    out = []
+    for slot in range(UserConfig.MAX_ACCOUNT_COUNT):
+        config = UserConfig.getInstance(slot)
+        if config.isClientActivated():
+            out.append((slot, int(config.getClientUserId())))
+    return out
+
+
+def current_slot():
+    from client_utils import get_last_fragment
+    from org.telegram.messenger import UserConfig
+
+    fragment = get_last_fragment()
+    if fragment is not None:
+        return int(fragment.getCurrentAccount())
+    return int(UserConfig.selectedAccount)
+
+
+def slot_of(tg_id):
+    """The slot signed in as Telegram user `tg_id`, else None."""
+    for slot, user_id in signed_in():
+        if tg_id and user_id == int(tg_id):
+            return slot
+    return None
+
+
+def name_of(slot):
+    from org.telegram.messenger import UserConfig, UserObject
+
+    user = UserConfig.getInstance(slot).getCurrentUser()
+    return UserObject.getUserName(user) if user is not None else f"account {slot + 1}"
+
+
+def _query_class():
+    if not _Query:
+        from java import dynamic_proxy
+        from java.lang import Runnable
+
+        class Query(dynamic_proxy(Runnable)):
+            def __init__(self, storage, done):
+                super().__init__()
+                self.storage = storage
+                self.done = done
+
+            def run(self):
+                found = set()
+                try:
+                    cursor = self.storage.getDatabase().queryFinalized(
+                        "SELECT did FROM dialogs"
+                    )
+                    while cursor.next():
+                        found.add(int(cursor.longValue(0)))
+                    cursor.dispose()
+                except Exception as exc:
+                    diag.error("accounts.query", exc)
+                self.done(found)
+
+        _Query.append(Query)
+    return _Query[0]
+
+
+def refresh(wait=False):
+    """Re-reads every account's dialogs (blocking when `wait`; never call
+    that from the UI or a storage thread)."""
+    global _loaded_at
+    from org.telegram.messenger import MessagesStorage
+
+    pending = []
+    for slot, _user in signed_in():
+        event = threading.Event()
+
+        def done(found, slot=slot, event=event):
+            with _lock:
+                _dialogs[slot] = found
+            event.set()
+
+        storage = MessagesStorage.getInstance(slot)
+        storage.getStorageQueue().postRunnable(_query_class()(storage, done))
+        pending.append(event)
+    _loaded_at = time.monotonic()
+    if wait:
+        for event in pending:
+            event.wait(5)
+
+
+def _fresh():
+    if time.monotonic() - _loaded_at > _REFRESH_SECONDS:
+        refresh()
+
+
+def has_access(slot, dialog_id):
+    """Whether `slot` can open the dialog (a member, for groups/channels)."""
+    from org.telegram.messenger import ChatObject, MessagesController
+
+    dialog_id = int(dialog_id)
+    controller = MessagesController.getInstance(slot)
+    if dialog_id > 0:
+        return dialog_id in _dialogs.get(slot, ()) or (
+            controller.dialogs_dict.get(dialog_id) is not None
+        )
+    import tg
+
+    chat = tg.channel_chat(slot, -dialog_id)
+    return chat is not None and not ChatObject.isNotInChat(chat)
+
+
+def with_access(dialog_id, prefer=()):
+    """Signed-in slots that can open the dialog: `prefer` first, then any
+    whose chats include it."""
+    _fresh()
+    with _lock:
+        cached = [s for s, d in _dialogs.items() if int(dialog_id) in d]
+    order = [s for s in prefer if s is not None] + cached
+    seen, out = set(), []
+    for slot in order:
+        if slot in seen:
+            continue
+        seen.add(slot)
+        try:
+            if has_access(slot, dialog_id):
+                out.append(slot)
+        except Exception as exc:
+            diag.error("accounts.has_access", exc)
+    return out
+
+
+def resolve_username(username):
+    """Dialog id of a username known to any signed-in account, else None."""
+    from org.telegram.messenger import MessagesController
+    from org.telegram.tgnet import TLRPC
+
+    for slot, _user in signed_in():
+        found = MessagesController.getInstance(slot).getUserOrChat(username)
+        if isinstance(found, TLRPC.User):
+            return int(found.id)
+        if isinstance(found, TLRPC.Chat):
+            return -int(found.id)
+    return None

src/api.py

@@ -0,0 +1,141 @@
+"""telegram-panel client API (`/api/v1/client/message-logger`).
+
+Each token reads one master's logs (the account owning the logger groups);
+the plugin holds one per master. A chat's state merges every master's answer;
+a single message is looked up master by master.
+
+Calls are blocking: run them off the UI thread (`jutil.in_background`).
+"""
+
+import re
+import time
+
+import diag
+from config import API_TOKEN, HTTP_TIMEOUT_SECONDS, SERVER_URL
+
+# A token the server refuses (403: unbound, no permission) is skipped this long.
+_REFUSED_SECONDS = 600
+
+
+class ApiError(Exception):
+    pass
+
+
+class Api:
+    def __init__(self, plugin):
+        self.plugin = plugin
+        self._refused = {}  # token -> monotonic time to retry at
+
+    @property
+    def configured(self):
+        return bool(self._base() and self.tokens())
+
+    def _base(self):
+        url = str(self.plugin.get_setting(SERVER_URL, "") or "").strip().rstrip("/")
+        return url + "/api/v1/client/message-logger" if url else ""
+
+    def tokens(self):
+        raw = str(self.plugin.get_setting(API_TOKEN, "") or "")
+        return [t for t in re.split(r"[\s,;]+", raw) if t]
+
+    def _call(self, token, method, path, **kwargs):
+        import requests
+
+        if not self._base():
+            raise ApiError("Server URL is not set")
+        try:
+            response = requests.request(
+                method,
+                self._base() + path,
+                headers={"Authorization": "Bearer " + token},
+                timeout=HTTP_TIMEOUT_SECONDS,
+                **kwargs,
+            )
+        except requests.RequestException as exc:
+            raise ApiError(f"Server unreachable: {exc}") from exc
+        if response.status_code == 404:
+            return None
+        if response.status_code >= 400:
+            try:
+                detail = response.json().get("detail")
+            except Exception:
+                detail = response.text[:200]
+            raise ApiError(f"{response.status_code}: {detail}")
+        return response.json()
+
+    def _each(self, method, path, **kwargs):
+        """(token, result) for every usable token; a refused one is skipped."""
+        for token in self.tokens():
+            if time.monotonic() < self._refused.get(token, 0):
+                continue
+            try:
+                yield token, self._call(token, method, path, **kwargs)
+            except ApiError as exc:
+                if str(exc).startswith(("401", "403")):
+                    diag.log(f"token {token[:10]}… refused: {exc}")
+                    self._refused[token] = time.monotonic() + _REFUSED_SECONDS
+                    continue
+                raise
+
+    def _first(self, method, path, **kwargs):
+        for _token, result in self._each(method, path, **kwargs):
+            if result is not None:
+                return result
+        return None
+
+    def me(self):
+        """[(token prefix, /me or the error)] for every token."""
+        out = []
+        for token in self.tokens():
+            try:
+                out.append((token[:10], self._call(token, "GET", "/me")))
+            except ApiError as exc:
+                out.append((token[:10], exc))
+        return out
+
+    def sync(self, account_id, chat_id, min_id, max_id, present_ids):
+        body = {
+            "account_id": account_id,
+            "chat_id": chat_id,
+            "min_id": min_id,
+            "max_id": max_id,
+            "present_ids": list(present_ids)[:1000],
+        }
+        states, missing, any_result = {}, set(), False
+        for _token, result in self._each("POST", "/sync", json=body):
+            if result is None:
+                continue
+            any_result = True
+            for state in result.get("states") or []:
+                states.setdefault(int(state["message_id"]), state)
+            missing.update(int(i) for i in result.get("missing") or [])
+        if not any_result:
+            return None
+        return {"states": list(states.values()), "missing": sorted(missing)}
+
+    def message(self, account_id, chat_id, message_id):
+        return self._first(
+            "GET",
+            f"/messages/{chat_id}/{message_id}",
+            params={"account_id": account_id},
+        )
+
+    def versions(self, account_id, chat_id, message_id):
+        return self._first(
+            "GET",
+            f"/messages/{chat_id}/{message_id}/versions",
+            params={"account_id": account_id},
+        )
+
+    def deletions(self, account_id, chat_id, message_ids):
+        ids = sorted(set(int(i) for i in message_ids))
+        marked = 0
+        for start in range(0, len(ids), 500):
+            body = {
+                "account_id": account_id,
+                "chat_id": chat_id,
+                "message_ids": ids[start : start + 500],
+            }
+            for _token, result in self._each("POST", "/deletions", json=body):
+                marked += int((result or {}).get("marked", 0))
+        return marked

src/config.py

@@ -0,0 +1,36 @@
+"""Setting keys and defaults."""
+
+SERVER_URL = "server_url"
+API_TOKEN = "api_token"
+KEEP_DELETED = "keep_deleted"
+RESTORE_MISSING = "restore_missing"
+REPORT_DELETIONS = "report_deletions"
+DELETED_ALPHA = "deleted_alpha"
+CACHE_DAYS = "cache_days"
+
+DEFAULTS = {
+    SERVER_URL: "",
+    API_TOKEN: "",
+    KEEP_DELETED: True,
+    RESTORE_MISSING: True,
+    REPORT_DELETIONS: True,
+    DELETED_ALPHA: 0,  # index into ALPHA_CHOICES
+    CACHE_DAYS: 2,  # index into CACHE_DAYS_CHOICES
+}
+
+# Opacity of deleted messages: well visible, marked by the trash icon.
+ALPHA_CHOICES = [("75%", 0.75), ("90%", 0.9), ("50%", 0.5)]
+
+# A chat's checked range of message ids stays valid this long: within it the
+# server is asked again only after an edit/delete event in the chat.
+COVERAGE_SECONDS = 3600
+# Cached server answers older than this are removed (checked once a day).
+CACHE_DAYS_CHOICES = [
+    ("1 day", 1),
+    ("7 days", 7),
+    ("30 days", 30),
+    ("90 days", 90),
+    ("365 days", 365),
+    ("Never", None),
+]
+HTTP_TIMEOUT_SECONDS = 15

src/diag.py

@@ -0,0 +1,54 @@
+"""Diagnostics mirrored to a file, since this device's logcat surfaces neither
+Chaquopy stdout nor android_utils.log output.
+
+The file lives under `get_files_dir()` (app external storage), so it is
+readable over adb:
+  adb shell cat "/sdcard/Android/data/com.exteragram.messenger/files/exteraGram/exteraGram Files/message_logger/diag.log"
+"""
+
+import os
+import time
+import traceback
+
+_MAX_BYTES = 256 * 1024
+_path = None
+
+
+def _file():
+    global _path
+    if _path is None:
+        try:
+            from file_utils import get_files_dir
+
+            directory = os.path.join(get_files_dir(), "message_logger")
+            os.makedirs(directory, exist_ok=True)
+            _path = os.path.join(directory, "diag.log")
+        except Exception:
+            _path = ""
+    return _path
+
+
+def log(message):
+    line = time.strftime("%H:%M:%S ") + str(message)
+    try:
+        from android_utils import log as android_log
+
+        android_log("[message_logger] " + line)
+    except Exception:
+        pass
+    path = _file()
+    if not path:
+        return
+    try:
+        mode = "a"
+        if os.path.exists(path) and os.path.getsize(path) > _MAX_BYTES:
+            mode = "w"
+        with open(path, mode, encoding="utf-8") as handle:
+            handle.write(line + "\n")
+    except Exception:
+        pass
+
+
+def error(where, exc=None):
+    detail = traceback.format_exc() if exc is not None else ""
+    log(f"ERROR {where}: {exc!r}\n{detail}")

src/greeting/__init__.py

@@ -1 +0,0 @@
-from .template import render, TemplateError

src/greeting/template.py

@@ -1,13 +0,0 @@
-from textutil import normalize
-
-
-class TemplateError(ValueError):
-    pass
-
-
-def render(template: str, name: str) -> str:
-    normalized = normalize(name)
-    try:
-        return template.format(name=normalized)
-    except (KeyError, IndexError, ValueError):
-        raise TemplateError(f"unsupported placeholder in {template!r}")

src/header.py

@@ -0,0 +1,41 @@
+"""The logger's saved copy starts with a header (From, links, deletion
+marker...) separated from the body by a divider, which plain messages render
+as a blank line (telegram-panel render.compose / to_basic_html). Restored
+messages show only the body.
+
+Pure Python, so tools/verify_bundle.py can test it offline.
+"""
+
+_FIRST_LINE = ("✉️ From:", "✉ From:")
+
+
+def utf16_len(text):
+    return len(text.encode("utf-16-le")) // 2
+
+
+def body_start(text):
+    """UTF-16 offset where the body begins, or 0 when there is no header."""
+    if not text or not text.startswith(_FIRST_LINE):
+        return 0
+    cut = text.find("\n\n")
+    if cut < 0:
+        return utf16_len(text)  # header only (e.g. media without caption)
+    return utf16_len(text[: cut + 2])
+
+
+def strip(text, entities):
+    """`text` without its header, and `entities` [(offset, length, value)]
+    moved to match; entities inside the header are dropped."""
+    start = body_start(text)
+    if start == 0:
+        return text, list(entities)
+    units = text.encode("utf-16-le")
+    body = units[start * 2 :].decode("utf-16-le")
+    kept = []
+    for offset, length, value in entities:
+        end = offset + length
+        if end <= start:
+            continue
+        new_offset = max(offset, start) - start
+        kept.append((new_offset, end - max(offset, start), value))
+    return body, kept

src/hooks/chat.py

@@ -0,0 +1,501 @@
+"""Per open chat: sync the loaded window with the server, confirm and report
+messages that vanished, and put deleted messages back from the logger.
+
+ChatActivity (12.10.6, probed): updateMessagesVisiblePart(boolean) runs on
+every scroll/load; `messages` is the loaded ArrayList<MessageObject>, newest
+first; `chatListView`, `chatAdapter`.
+
+The server is asked about a chat only when needed (store.coverage keeps the
+range of ids already checked, per chat, for COVERAGE_SECONDS):
+- the chat wasn't checked within the hour: everything loaded, from the oldest
+  loaded message on, and the answer replaces the chat's cached marks;
+- history older than the checked range was loaded: that older part only;
+- an edit or delete event in the chat (or a deletion this client reported):
+  the check is expired, so the next look asks again.
+Answers hold at most 100 marks and 100 missing ids, newest first; a capped
+answer covers down to its oldest mark, the rest is asked for next.
+
+Restored messages go through ChatActivity.processNewMessages, like messages
+that just arrived: the app places them and keeps `messagesDict` and its
+adapter consistent (inserting into `messages` directly broke later arrivals),
+and deleting one removes it the usual way.
+"""
+
+import time
+
+from base_plugin import MethodHook
+
+import diag
+import header
+import peers
+import store
+import tg
+from api import ApiError
+from config import COVERAGE_SECONDS, REPORT_DELETIONS, RESTORE_MISSING
+from jutil import field, hook_methods, in_background, java_class, java_list, on_ui
+
+CHAT = "org.telegram.ui.ChatActivity"
+_DEBOUNCE_MS = 700
+# The server logs an edit asynchronously; sync after it had time to.
+_EDIT_DELAY_MS = 4000
+EDIT_UPDATES = ("TL_updateEditMessage", "TL_updateEditChannelMessage")
+
+
+def _epoch(iso):
+    if not iso:
+        return 0
+    from datetime import datetime
+
+    try:
+        return int(datetime.fromisoformat(iso).timestamp())
+    except ValueError:
+        return 0
+
+
+_MAX_ID = 2**31 - 1
+
+
+def _end_reached(fragment, name):
+    """ChatActivity.endReached / forwardEndReached: boolean[2], index 0 is
+    the chat itself (1 is the merged migrated chat)."""
+    flags = field(fragment, name)
+    try:
+        return bool(flags[0])
+    except Exception:
+        return False
+
+
+_process = []
+
+
+def _process_new_messages():
+    """ChatActivity.processNewMessages(ArrayList, boolean) (private)."""
+    if not _process:
+        from java.lang import Boolean
+
+        method = java_class(CHAT).getDeclaredMethod(
+            "processNewMessages", java_class("java.util.ArrayList"), Boolean.TYPE
+        )
+        method.setAccessible(True)
+        _process.append(method)
+    return _process[0]
+
+
+def _plan(coverage, low, high, now):
+    """(low, high, fresh) to ask the server about, or None when the loaded
+    range [low, high] is already checked."""
+    if coverage is None or now - coverage[2] >= COVERAGE_SECONDS:
+        return low, high, True
+    covered_low, covered_high, _at = coverage
+    if low < covered_low:
+        return low, covered_low - 1, False  # older history was loaded
+    if high > covered_high:
+        return covered_high + 1, high, False  # newer messages were loaded
+    return None
+
+
+def _cover(account, dialog_id, low, high, fresh):
+    """Records [low, high] as checked: a fresh check starts the hour, a
+    partial one extends the range it belongs to."""
+    current = store.coverage(account, dialog_id)
+    if fresh or current is None:
+        store.set_coverage(account, dialog_id, low, high, time.time())
+        return
+    covered_low, covered_high, at = current
+    store.set_coverage(
+        account, dialog_id, min(covered_low, low), max(covered_high, high), at
+    )
+
+
+def _loaded(fragment, message_id):
+    """Whether the app itself has `message_id` in this chat (messagesDict[0])."""
+    try:
+        return field(fragment, "messagesDict")[0].get(int(message_id)) is not None
+    except Exception:
+        return False
+
+
+def _android_peer_id(marked):
+    """Telethon sender id -> Android peer id (channels are -id)."""
+    marked = int(marked)
+    if marked <= -peers.CHANNEL_OFFSET:
+        return -(-marked - peers.CHANNEL_OFFSET)
+    return marked
+
+
+def _strip_rich_header(rich):
+    """A rich copy is header paragraphs, a divider, then the body
+    (telegram-panel render.compose): drop everything up to the divider."""
+    blocks = rich.blocks
+    for index in range(min(blocks.size(), 12)):
+        if blocks.get(index).getClass().getSimpleName() == "pageBlockDivider":
+            for _ in range(index + 1):
+                blocks.remove(0)
+            return
+
+
+def _rich_text(node):
+    """Plain text of a TL_iv RichText tree (textPlain/textConcat/styles...)."""
+    if node is None:
+        return ""
+    value = getattr(node, "text", None)
+    if isinstance(value, str):
+        return value
+    texts = getattr(node, "texts", None)
+    if texts is not None and hasattr(texts, "size"):
+        return "".join(_rich_text(t) for t in java_list(texts))
+    return _rich_text(value)
+
+
+def _rich_plain_text(rich):
+    """The body as plain text when it is only text paragraphs, else None."""
+    blocks = java_list(rich.blocks)
+    if not blocks or any(
+        b.getClass().getSimpleName() != "pageBlockParagraph" for b in blocks
+    ):
+        return None
+    return "\n".join(_rich_text(b.text) for b in blocks)
+
+
+class ChatSync:
+    def __init__(self, plugin, api):
+        self.plugin = plugin
+        self.api = api
+        self.handles = []
+        self._scheduled = set()
+        self._inflight = set()  # (account, dialog) with a sync running
+        self._exists = {}  # (account, dialog) -> ids Telegram still has
+        self._restoring = set()  # (account, dialog, id) in flight
+        self._fragments = {}  # (account, dialog) -> last ChatActivity seen
+
+    def install(self):
+        for name in EDIT_UPDATES:
+            self.plugin.add_hook(name)
+        sync = self
+
+        class AfterVisible(MethodHook):
+            def after_hooked_method(self, param):
+                try:
+                    sync.schedule(param.thisObject)
+                except Exception as exc:
+                    diag.error("chat.schedule", exc)
+
+        self.handles += hook_methods(
+            self.plugin, CHAT, "updateMessagesVisiblePart", AfterVisible()
+        )
+
+    def uninstall(self):
+        for name in EDIT_UPDATES:
+            try:
+                self.plugin.remove_hook(name)
+            except Exception:
+                pass
+        for handle in self.handles:
+            try:
+                self.plugin.unhook_method(handle)
+            except Exception:
+                pass
+        self.handles = []
+
+    # collecting the window (UI thread)
+
+    def schedule(self, fragment):
+        if not self.api.configured:
+            return
+        guid = int(fragment.getClassGuid())
+        if guid in self._scheduled:
+            return
+        self._scheduled.add(guid)
+        on_ui(lambda: self._collect(fragment, guid), _DEBOUNCE_MS)
+
+    def _collect(self, fragment, guid):
+        self._scheduled.discard(guid)
+        self.plugin.purge_cache()  # once a day
+        account = int(fragment.getCurrentAccount())
+        dialog_id = int(fragment.getDialogId())
+        chat_id = peers.marked_chat_id(account, dialog_id)
+        if chat_id is None:
+            return
+        key = (account, dialog_id)
+        self._fragments[key] = fragment
+        if key in self._inflight:
+            return
+        ids = [
+            int(m.getId())
+            for m in java_list(field(fragment, "messages"))
+            if m is not None and int(m.getId()) > 0
+        ]
+        if not ids:
+            return
+        # The oldest loaded message bounds every request; an end of the chat
+        # that is loaded is open (deleted past it still belongs to it).
+        low = 1 if _end_reached(fragment, "endReached") else min(ids)
+        high = _MAX_ID if _end_reached(fragment, "forwardEndReached") else max(ids)
+        request = _plan(store.coverage(account, dialog_id), low, high, time.time())
+        if request is None:
+            # Checked within the hour: deleted messages come back from the
+            # cached answers (they were never in the app's own database).
+            if self.plugin.get_setting(RESTORE_MISSING, True):
+                present = set(ids)
+                gone = [
+                    s
+                    for s in store.cached_deleted(account, dialog_id, low, high)
+                    if int(s["message_id"]) not in present
+                ]
+                if gone:
+                    me = peers.own_user_id(account)
+                    in_background(
+                        lambda: self._restore(
+                            fragment, account, dialog_id, chat_id, me, gone
+                        )
+                    )
+            return
+        present = {i for i in ids if request[0] <= i <= request[1]}
+        self._inflight.add(key)
+        in_background(
+            lambda: self._sync(fragment, account, dialog_id, chat_id, request, present)
+        )
+
+    # server round trip (background)
+
+    def _sync(self, fragment, account, dialog_id, chat_id, request, present):
+        key = (account, dialog_id)
+        try:
+            self._sync_range(fragment, account, dialog_id, chat_id, request, present)
+        finally:
+            self._inflight.discard(key)
+
+    def _sync_range(self, fragment, account, dialog_id, chat_id, request, present):
+        low, high, fresh = request
+        me = peers.own_user_id(account)
+        started = time.monotonic()
+        try:
+            result = self.api.sync(me, chat_id, low, high, sorted(present))
+        except ApiError as exc:
+            diag.log(f"sync {chat_id}: {exc}")
+            return
+        if not result:
+            return
+        states = result.get("states") or []
+        capped = len(states) >= 100
+        diag.log(
+            f"sync {chat_id} [{low}..{high}]{' fresh' if fresh else ''} "
+            f"loaded={len(present)} marks={len(states)} "
+            f"missing={len(result.get('missing') or [])} "
+            f"{int((time.monotonic() - started) * 1000)}ms"
+        )
+        dropped = store.replace_window(
+            account, dialog_id, low, high, states, capped, full=fresh
+        )
+        # A capped answer is complete from its oldest mark up only.
+        covered_low = max(low, min(int(s["message_id"]) for s in states)) if capped else low
+        _cover(account, dialog_id, covered_low, high, fresh)
+        changed = {int(s["message_id"]) for s in states} | set(dropped)
+        if changed:
+            on_ui(lambda: self.refresh(fragment, changed))
+        known = self._exists.setdefault((account, dialog_id), set())
+        missing = [int(i) for i in result.get("missing") or [] if int(i) not in known]
+        if missing:
+            self._confirm(fragment, account, dialog_id, chat_id, me, missing[:100])
+        if self.plugin.get_setting(RESTORE_MISSING, True):
+            gone = [
+                s
+                for s in states
+                if s.get("deleted_at") and int(s["message_id"]) not in present
+            ]
+            if gone:
+                self._restore(fragment, account, dialog_id, chat_id, me, gone)
+
+    def _confirm(self, fragment, account, dialog_id, chat_id, me, ids):
+        """Ask Telegram about ids the server has and the client lacks; those
+        it no longer has were deleted while we were away."""
+        from org.telegram.tgnet import TLRPC
+
+        def done(found, error):
+            if found is None:
+                diag.log(f"confirm {chat_id}: {error}")
+                return
+            gone = [
+                i
+                for i in ids
+                if found.get(i) is None or isinstance(found[i], TLRPC.TL_messageEmpty)
+            ]
+            self._exists.setdefault((account, dialog_id), set()).update(
+                set(ids) - set(gone)
+            )
+            if not gone:
+                return
+            diag.log(f"confirmed deleted in {chat_id}: {gone}")
+            store.mark_deleted(account, dialog_id, gone)
+            if self.plugin.get_setting(REPORT_DELETIONS, True):
+                in_background(lambda: self._report(account, dialog_id, chat_id, me, gone))
+
+        tg.get_messages(account, dialog_id, ids, done)
+
+    def _report(self, account, dialog_id, chat_id, me, ids):
+        try:
+            marked = self.api.deletions(me, chat_id, ids)
+            diag.log(f"reported {len(ids)} deletions in {chat_id}, marked {marked}")
+        except ApiError as exc:
+            diag.log(f"report {chat_id}: {exc}")
+            return
+        # Sync again for the server's new state (and the logged copies).
+        self.changed(account, dialog_id)
+
+    # restoring (background -> UI)
+
+    def _restore(self, fragment, account, dialog_id, chat_id, me, states):
+        for state in states:
+            message_id = int(state["message_id"])
+            key = (account, dialog_id, message_id)
+            if key in self._restoring:
+                continue
+            pointer, strip = self._source(me, chat_id, message_id, state)
+            if pointer is None:
+                continue
+            self._restoring.add(key)
+            self._fetch_copy(fragment, account, dialog_id, message_id, state, pointer, strip)
+
+    def _source(self, me, chat_id, message_id, state):
+        """Where to read the deleted message from: its last version (no
+        header) when it was edited, else the saved copy (header stripped)."""
+        if int(state.get("edit_count") or 0) > 0:
+            try:
+                versions = self.api.versions(me, chat_id, message_id)
+            except ApiError as exc:
+                diag.log(f"versions {chat_id}/{message_id}: {exc}")
+                versions = None
+            if versions and versions.get("chat_id") and versions.get("versions"):
+                last = versions["versions"][-1]
+                return {"chat_id": versions["chat_id"], "message_id": last["message_id"]}, False
+        return state.get("logged"), True
+
+    def _fetch_copy(self, fragment, account, dialog_id, message_id, state, pointer, strip):
+        channel_id = peers.channel_id_from_marked(pointer["chat_id"])
+        copy_id = int(pointer["message_id"])
+
+        def done(found, error):
+            copy = (found or {}).get(copy_id)
+            if copy is None or getattr(copy, "message", None) is None and getattr(copy, "media", None) is None:
+                self._restoring.discard((account, dialog_id, message_id))
+                diag.log(f"copy {pointer} unavailable: {error}")
+                return
+            on_ui(lambda: self._insert(fragment, account, dialog_id, message_id, state, copy, strip))
+
+        tg.get_messages(account, -channel_id, [copy_id], done)
+
+    def _build(self, account, dialog_id, message_id, state, copy, strip):
+        from java.util import ArrayList
+        from org.telegram.messenger import MessageObject, MessagesController
+        from org.telegram.tgnet import TLRPC
+
+        controller = MessagesController.getInstance(account)
+        msg = TLRPC.TL_message()
+        msg.id = message_id
+        msg.dialog_id = dialog_id
+        msg.peer_id = controller.getPeer(dialog_id)
+        sender = state.get("sender_id")
+        msg.from_id = (
+            controller.getPeer(_android_peer_id(sender)) if sender else msg.peer_id
+        )
+        msg.flags |= 256
+        msg.date = _epoch(state.get("source_date")) or int(copy.date)
+        if int(state.get("edit_count") or 0) > 0:
+            msg.edit_date = _epoch(state.get("edit_date")) or msg.date
+            msg.flags |= 32768  # edited: the app draws its pencil
+        text = copy.message or ""
+        entities = [(int(e.offset), int(e.length), e) for e in java_list(copy.entities)]
+        if strip:
+            text, entities = header.strip(text, entities)
+        msg.message = text
+        msg.entities = ArrayList()
+        for offset, length, entity in entities:
+            entity.offset = offset
+            entity.length = length
+            msg.entities.add(entity)
+        media = getattr(copy, "media", None)
+        if media is not None and not isinstance(media, TLRPC.TL_messageMediaEmpty):
+            msg.media = media
+            msg.flags |= 512
+        rich = getattr(copy, "rich_message", None)
+        if rich is not None:
+            if strip:
+                _strip_rich_header(rich)
+            plain = _rich_plain_text(rich)
+            if plain is not None:
+                # Text only: a normal bubble, as the original was.
+                msg.message = plain
+                msg.entities = ArrayList()
+            else:
+                msg.rich_message = rich
+                msg.flags2 |= 1 << 12
+        own = peers.own_user_id(account)
+        msg.out = sender is not None and int(sender) == own
+        msg.unread = False
+        return MessageObject(account, msg, True, True)
+
+    def _insert(self, fragment, account, dialog_id, message_id, state, copy, strip):
+        """Hands the rebuilt message to the chat the way new messages arrive
+        (ChatActivity.processNewMessages), so the app places it and keeps its
+        own dicts and adapter consistent."""
+        self._restoring.discard((account, dialog_id, message_id))
+        messages = field(fragment, "messages")
+        if messages is None:
+            return
+        if _loaded(fragment, message_id) or any(
+            m is not None and int(m.getId()) == message_id for m in java_list(messages)
+        ):
+            return
+        from java import jboolean
+        from java.util import ArrayList
+
+        obj = self._build(account, dialog_id, message_id, state, copy, strip)
+        store.mark_deleted(account, dialog_id, [message_id])
+        batch = ArrayList()
+        batch.add(obj)
+        _process_new_messages().invoke(fragment, batch, jboolean(False))
+        diag.log(f"restored {dialog_id}/{message_id}")
+
+    # cells (UI thread)
+
+    def refresh(self, fragment, ids):
+        """Rebind the rows of `ids`: their alpha or pill (and so their height)
+        changed, which only a relayout of the list places correctly."""
+        messages = field(fragment, "messages")
+        adapter = field(fragment, "chatAdapter")
+        if messages is None or adapter is None:
+            return
+        # A rebind alone reuses the cached measure: flag the cells for layout.
+        list_view = field(fragment, "chatListView")
+        if list_view is not None:
+            for i in range(list_view.getChildCount()):
+                child = list_view.getChildAt(i)
+                message = child.getMessageObject() if hasattr(child, "getMessageObject") else None
+                if message is not None and int(message.getId()) in ids:
+                    child.forceLayout()
+        start = int(adapter.messagesStartRow)
+        for index, m in enumerate(java_list(messages)):
+            if m is not None and int(m.getId()) in ids:
+                m.forceUpdate = True  # rebinding lays the cell out again (time row)
+                adapter.notifyItemChanged(start + index)
+
+    def on_edited(self, account, message):
+        """An edit arrived: sync that chat again once the server logged it."""
+        from org.telegram.messenger import MessageObject
+
+        self.changed(
+            int(account), int(MessageObject.getDialogId(message)), _EDIT_DELAY_MS
+        )
+
+    def changed(self, account, dialog_id, delay_ms=0):
+        """An edit/delete event in a chat: its check is expired, and the chat
+        synced again (after `delay_ms`) when it is open."""
+        store.expire_coverage(account, dialog_id)
+        fragment = self._fragments.get((account, dialog_id))
+        if fragment is not None:
+            on_ui(lambda: self.schedule(fragment), delay_ms)
+
+    def refresh_dialog(self, account, dialog_id, ids):
+        fragment = self._fragments.get((account, dialog_id))
+        if fragment is not None:
+            on_ui(lambda: self.refresh(fragment, set(int(i) for i in ids)))

src/hooks/deletes.py

@@ -0,0 +1,145 @@
+"""Keeps messages others delete: the delete updates are dropped (the message
+stays in the app's cache and chat) and the ids are remembered as deleted.
+
+Deletions the user makes here go through MessagesController.deleteMessages
+(both overloads start `(messages, randoms, encryptedChat, dialogId, ...)`);
+those ids are let through when their echo update arrives.
+
+TL_updateDeleteMessages (private chats, basic groups) carries no chat: ids
+are per account, so the dialog is looked up in the app's own database on the
+storage queue.
+"""
+
+from base_plugin import HookResult, HookStrategy, MethodHook
+
+import diag
+import peers
+import store
+from api import ApiError
+from config import KEEP_DELETED, REPORT_DELETIONS
+from jutil import field, hook_methods, in_background, java_ints
+
+UPDATES = ("TL_updateDeleteMessages", "TL_updateDeleteChannelMessages")
+
+
+class Deletes:
+    def __init__(self, plugin, api, chats):
+        self.plugin = plugin
+        self.api = api
+        self.chats = chats
+        self.handles = []
+
+    def install(self):
+        for name in UPDATES:
+            self.plugin.add_hook(name)
+        deletes = self
+
+        class BeforeDelete(MethodHook):
+            def before_hooked_method(self, param):
+                try:
+                    deletes.on_own_delete(param)
+                except Exception as exc:
+                    diag.error("deletes.own", exc)
+
+        self.handles += hook_methods(
+            self.plugin,
+            "org.telegram.messenger.MessagesController",
+            "deleteMessages",
+            BeforeDelete(),
+        )
+
+    def uninstall(self):
+        for name in UPDATES:
+            try:
+                self.plugin.remove_hook(name)
+            except Exception:
+                pass
+        for handle in self.handles:
+            try:
+                self.plugin.unhook_method(handle)
+            except Exception:
+                pass
+        self.handles = []
+
+    def on_own_delete(self, param):
+        args = list(param.args or [])
+        if len(args) < 4:
+            return
+        ids = [i for i in java_ints(args[0]) if i > 0]
+        if not ids:
+            return
+        account = int(field(param.thisObject, "currentAccount") or 0)
+        dialog_id = int(args[3] or 0)
+        store.note_own_deletion(account, ids)
+        store.forget_deleted(account, dialog_id, ids)
+
+    def on_update(self, name, account, update):
+        ids = java_ints(update.messages)
+        others = [i for i in ids if not store.is_own_deletion(account, i)]
+        if not others:
+            return HookResult()
+        if name == "TL_updateDeleteChannelMessages":
+            self._deleted(account, -int(update.channel_id), others)
+        else:
+            self._resolve_dialogs(account, others)
+        if not self.plugin.get_setting(KEEP_DELETED, True):
+            return HookResult()
+        diag.log(f"kept {name} {others}")
+        if len(others) == len(ids):
+            return HookResult(strategy=HookStrategy.CANCEL)
+        from java import jint
+        from java.util import ArrayList
+
+        own = ArrayList()
+        for i in ids:
+            if i not in others:
+                own.add(jint(i))  # a plain int would be boxed as Long
+        update.messages = own
+        return HookResult(strategy=HookStrategy.MODIFY, update=update)
+
+    def _deleted(self, account, dialog_id, ids):
+        store.mark_deleted(account, dialog_id, ids)
+        self.chats.refresh_dialog(account, dialog_id, ids)
+        # Check the chat again once the server had the report.
+        self.chats.changed(account, dialog_id, 3000)
+        if self.plugin.get_setting(REPORT_DELETIONS, True) and self.api.configured:
+            in_background(lambda: self._report(account, dialog_id, ids))
+
+    def _report(self, account, dialog_id, ids):
+        chat_id = peers.marked_chat_id(account, dialog_id)
+        if chat_id is None:
+            return
+        try:
+            self.api.deletions(peers.own_user_id(account), chat_id, ids)
+        except ApiError as exc:
+            diag.log(f"report {chat_id}: {exc}")
+
+    def _resolve_dialogs(self, account, ids):
+        """Dialogs of per-account message ids, from the app's database."""
+        from java import dynamic_proxy
+        from java.lang import Runnable
+        from org.telegram.messenger import MessagesStorage
+
+        storage = MessagesStorage.getInstance(account)
+        deletes = self
+
+        class Lookup(dynamic_proxy(Runnable)):
+            def run(self):
+                try:
+                    found = {}
+                    query = "SELECT mid, uid FROM messages_v2 WHERE mid IN (%s)" % (
+                        ",".join(str(int(i)) for i in ids)
+                    )
+                    cursor = storage.getDatabase().queryFinalized(query)
+                    while cursor.next():
+                        uid = int(cursor.longValue(1))
+                        if uid < 0 and peers.is_channel_dialog(account, uid):
+                            continue  # channel ids are numbered per channel
+                        found.setdefault(uid, []).append(int(cursor.intValue(0)))
+                    cursor.dispose()
+                    for dialog_id, mids in found.items():
+                        deletes._deleted(account, dialog_id, mids)
+                except Exception as exc:
+                    diag.error("deletes.resolve", exc)
+
+        storage.getStorageQueue().postRunnable(Lookup())

src/hooks/links.py

@@ -0,0 +1,112 @@
+"""Message links into chats the current account isn't in (the logger's
+"Message" links, mostly) open as a signed-in account that is (see
+views/open_as.py).
+
+Browser.openUrl (all overloads, Uri or String) is where tapped links go.
+"""
+
+import re
+
+from base_plugin import MethodHook
+
+import accounts
+import diag
+from jutil import hook_methods, on_ui
+from views import open_as
+
+BROWSER = "org.telegram.messenger.browser.Browser"
+
+_PRIVATE = re.compile(
+    r"^(?:https?://)?(?:www\.)?(?:t|telegram)\.me/c/(\d+)/(?:(\d+)/)?(\d+)", re.I
+)
+_PUBLIC = re.compile(
+    r"^(?:https?://)?(?:www\.)?(?:t|telegram)\.me/([A-Za-z0-9_]{4,32})/(\d+)(?:[/?#]|$)",
+    re.I,
+)
+_TG_PRIVATE = re.compile(r"^tg://privatepost\?(.*)$", re.I)
+_TG_RESOLVE = re.compile(r"^tg://resolve\?(.*)$", re.I)
+
+
+def _query(text):
+    out = {}
+    for part in text.split("&"):
+        key, _, value = part.partition("=")
+        out[key] = value
+    return out
+
+
+def parse(url):
+    """(dialog id, message id) of a message link, else None."""
+    url = url.strip()
+    match = _PRIVATE.match(url)
+    if match:
+        return -int(match.group(1)), int(match.group(3))
+    match = _TG_PRIVATE.match(url)
+    if match:
+        q = _query(match.group(1))
+        if q.get("channel", "").isdigit() and q.get("post", "").isdigit():
+            return -int(q["channel"]), int(q["post"])
+        return None
+    username, post = None, None
+    match = _PUBLIC.match(url)
+    if match:
+        username, post = match.group(1), match.group(2)
+    else:
+        match = _TG_RESOLVE.match(url)
+        if match:
+            q = _query(match.group(1))
+            username, post = q.get("domain"), q.get("post")
+    if not username or not post or not post.isdigit():
+        return None
+    dialog_id = accounts.resolve_username(username)
+    return (dialog_id, int(post)) if dialog_id is not None else None
+
+
+class Links:
+    def __init__(self, plugin):
+        self.plugin = plugin
+        self.handles = []
+
+    def install(self):
+        links = self
+
+        class BeforeOpen(MethodHook):
+            def before_hooked_method(self, param):
+                try:
+                    if links.open(param.args[1]):
+                        param.setResult(None)
+                except Exception as exc:
+                    diag.error("links.open", exc)
+
+        self.handles += hook_methods(self.plugin, BROWSER, "openUrl", BeforeOpen())
+
+    def uninstall(self):
+        for handle in self.handles:
+            try:
+                self.plugin.unhook_method(handle)
+            except Exception:
+                pass
+        self.handles = []
+
+    def open(self, uri):
+        """Opens the link as another account when needed; True if handled."""
+        if uri is None:
+            return False
+        target = parse(str(uri))
+        if target is None:
+            return False
+        dialog_id, message_id = target
+        from client_utils import get_last_fragment
+
+        fragment = get_last_fragment()
+        if fragment is None:
+            return False
+        current = int(fragment.getCurrentAccount())
+        if accounts.has_access(current, dialog_id):
+            return False
+        others = [s for s in accounts.with_access(dialog_id) if s != current]
+        if not others:
+            return False
+        slot = others[0]
+        on_ui(lambda: open_as.open_chat(fragment, slot, dialog_id, message_id))
+        return True

src/hooks/menu.py

@@ -0,0 +1,129 @@
+""""Edit history" in the message menu itself, right above Forward.
+
+Plugin menu items (MenuItemData) only go into the menu's Plugins folder, and
+exteraGram drops option ids it doesn't know from fillMessageMenu's lists, so
+the row is added to the built popup instead: after ChatActivity.createMenu,
+an ActionBarMenuSubItem styled like the Forward row (found by its localized
+text) is inserted above it, or first in the list when Forward is an icon of
+the bottom action bar (groups). ChatActivity.selectedObject is the message.
+"""
+
+from base_plugin import MethodHook
+
+import diag
+import store
+from jutil import field, hook_methods, java_class
+
+CHAT = "org.telegram.ui.ChatActivity"
+_LABEL = "Edit history"
+
+
+def _worth_it(message):
+    """Messages that may have a logged history: edited ones (the app's own
+    flag or the server's state), which logger posts are once their header
+    was refreshed."""
+    if message is None or int(message.getId()) <= 0:
+        return False
+    if int(getattr(message.messageOwner, "edit_date", 0) or 0):
+        return True
+    return store.is_edited(
+        int(message.currentAccount), int(message.getDialogId()), int(message.getId())
+    )
+
+
+def _first_item(view):
+    """The first ActionBarMenuSubItem under `view` (the main page comes
+    before the swipe-back pages), else None."""
+    if view.getClass().getSimpleName() == "ActionBarMenuSubItem":
+        return view
+    if hasattr(view, "getChildCount"):
+        for index in range(view.getChildCount()):
+            found = _first_item(view.getChildAt(index))
+            if found is not None:
+                return found
+    return None
+
+
+def _find_item(view, text):
+    """The ActionBarMenuSubItem showing `text` under `view`, else None."""
+    if view.getClass().getSimpleName() == "ActionBarMenuSubItem":
+        label = view.getTextView()
+        return view if label is not None and str(label.getText()) == text else None
+    if hasattr(view, "getChildCount"):
+        for index in range(view.getChildCount()):
+            found = _find_item(view.getChildAt(index), text)
+            if found is not None:
+                return found
+    return None
+
+
+class Menu:
+    def __init__(self, plugin, open_history):
+        self.plugin = plugin
+        self.open_history = open_history
+        self.handles = []
+        self._close = None
+
+    def install(self):
+        menu = self
+
+        class AfterCreate(MethodHook):
+            def after_hooked_method(self, param):
+                try:
+                    menu.add_item(param.thisObject)
+                except Exception as exc:
+                    diag.error("menu.add", exc)
+
+        self.handles += hook_methods(self.plugin, CHAT, "createMenu", AfterCreate())
+
+    def uninstall(self):
+        for handle in self.handles:
+            try:
+                self.plugin.unhook_method(handle)
+            except Exception:
+                pass
+        self.handles = []
+
+    def add_item(self, chat):
+        message = field(chat, "selectedObject")
+        popup = field(chat, "scrimPopupWindow")
+        if popup is None or not _worth_it(message):
+            return
+        # The createMenu overloads call one another: add the row once.
+        if _find_item(popup.getContentView(), _LABEL) is not None:
+            return
+        from org.telegram.messenger import LocaleController, R
+
+        content = popup.getContentView()
+        # Forward is a row in some chats and an icon in the bottom action bar
+        # in others (groups): then the row goes first in the list.
+        anchor = _find_item(
+            content, str(LocaleController.getString(R.string.Forward))
+        ) or _first_item(content)
+        if anchor is None:
+            diag.log("menu: no row to place Edit history by")
+            return
+        forward = anchor
+        from android_utils import OnClickListener
+        from org.telegram.ui.ActionBar import ActionBarMenuSubItem
+
+        parent = forward.getParent()
+        item = ActionBarMenuSubItem(forward.getContext(), False, False)
+        item.setTextAndIcon(_LABEL, R.drawable.msg_edit)
+        color = forward.getTextView().getCurrentTextColor()
+        item.setColors(color, color)
+        item.setMinimumWidth(forward.getMinimumWidth())
+
+        def chosen(_view):
+            self._close_menu(chat)
+            self.open_history(message)
+
+        item.setOnClickListener(OnClickListener(chosen))
+        parent.addView(item, parent.indexOfChild(forward), forward.getLayoutParams())
+
+    def _close_menu(self, chat):
+        if self._close is None:
+            method = java_class(CHAT).getDeclaredMethod("closeMenu")
+            method.setAccessible(True)
+            self._close = method
+        self._close.invoke(chat)

src/hooks/render.py

@@ -0,0 +1,176 @@
+"""Chat cell decoration of deleted messages: translucent, with a red trash icon
+(from the active icon pack) in the time row like the app's own "edited" pencil.
+
+ChatMessageCell (exteraGram 12.10.6, probed on device): setMessageObject
+(5 and 6 args), setAlpha(float), measureTime(MessageObject), and the private
+`currentTimeString` (SpannableStringBuilder), `timeTextWidth`, `timeWidth`,
+`timeLayout`. The pencil is a ColoredImageSpan on a leading "\\u200d " whose
+width (Layout.getDesiredWidth with Theme.chat_timePaint) the time widths
+include; the trash icon is added the same way, before the bubble is laid out.
+"""
+
+from base_plugin import MethodHook
+
+import diag
+import store
+from config import ALPHA_CHOICES, DELETED_ALPHA
+from jutil import field, hook_methods
+
+CELL = "org.telegram.ui.Cells.ChatMessageCell"
+_ICON = "\u200d "
+
+
+def _dp(value):
+    from org.telegram.messenger import AndroidUtilities
+
+    return AndroidUtilities.dp(value)
+
+
+def _message(cell):
+    try:
+        return cell.getMessageObject()
+    except Exception:
+        return None
+
+
+def _key(message):
+    """(account, dialog_id, message_id) of a real message, else None."""
+    if message is None:
+        return None
+    message_id = int(message.getId())
+    if message_id <= 0:
+        return None
+    return int(message.currentAccount), int(message.getDialogId()), message_id
+
+
+def _deleted(message):
+    key = _key(message)
+    return key is not None and store.is_deleted(*key)
+
+
+def _trash_drawable(res_id):
+    """The trash icon of the active icon pack: the activity's resources are
+    exteraGram's ExteraResources, which apply it (the application context's
+    plain Resources give the stock icon)."""
+    from client_utils import get_last_fragment
+
+    fragment = get_last_fragment()
+    activity = fragment.getParentActivity() if fragment is not None else None
+    if activity is not None:
+        resources = activity.getResources()
+    else:
+        from org.telegram.messenger import ApplicationLoader
+
+        resources = ApplicationLoader.applicationContext.getResources()
+    return resources.getDrawable(res_id, None).mutate()
+
+
+def _set_int(cell, name, value):
+    from hook_utils import set_private_field
+    from java import jint
+
+    set_private_field(cell, name, jint(int(value)))
+
+
+class Render:
+    def __init__(self, plugin):
+        self.plugin = plugin
+        self.handles = []
+
+    def _alpha(self):
+        index = int(self.plugin.get_setting(DELETED_ALPHA, 0) or 0)
+        return ALPHA_CHOICES[max(0, min(index, len(ALPHA_CHOICES) - 1))][1]
+
+    def install(self):
+        plugin = self.plugin
+        render = self
+
+        class AfterBind(MethodHook):
+            def after_hooked_method(self, param):
+                try:
+                    render.apply_alpha(param.thisObject)
+                except Exception as exc:
+                    diag.error("render.bind", exc)
+
+        class BeforeAlpha(MethodHook):
+            def before_hooked_method(self, param):
+                try:
+                    render.scale_alpha(param)
+                except Exception as exc:
+                    diag.error("render.alpha", exc)
+
+        class AfterMeasureTime(MethodHook):
+            def after_hooked_method(self, param):
+                try:
+                    render.add_trash(param.thisObject, param.args[0])
+                except Exception as exc:
+                    diag.error("render.time", exc)
+
+        self.handles += hook_methods(plugin, CELL, "setMessageObject", AfterBind())
+        self.handles += hook_methods(plugin, CELL, "setAlpha", BeforeAlpha())
+        self.handles += hook_methods(plugin, CELL, "measureTime", AfterMeasureTime())
+
+    def uninstall(self):
+        for handle in self.handles:
+            try:
+                self.plugin.unhook_method(handle)
+            except Exception:
+                pass
+        self.handles = []
+
+    # opacity
+
+    def apply_alpha(self, cell):
+        """Re-applies the cell's alpha through setAlpha (scaled below)."""
+        cell.setAlpha(1.0)
+
+    def scale_alpha(self, param):
+        """Deleted messages stay translucent whatever alpha the list's item
+        animators set: every setAlpha on their cell is scaled."""
+        if not _deleted(_message(param.thisObject)):
+            return
+        from java import jfloat
+
+        param.args[0] = jfloat(float(param.args[0]) * self._alpha())
+
+    # trash icon
+
+    def add_trash(self, cell, message):
+        if not _deleted(message):
+            return
+        # measureTime builds the string afresh: the icon goes in once, before
+        # the edited pencil if there is one.
+        text = field(cell, "currentTimeString")
+        if text is None:
+            return
+        from android.text import Layout, Spanned, StaticLayout
+        from org.telegram.messenger import R
+        from org.telegram.ui.ActionBar import Theme
+        from org.telegram.ui.Components import ColoredImageSpan
+
+        paint = Theme.chat_timePaint
+        before = Layout.getDesiredWidth(text, paint)
+        from java import jint
+
+        span = ColoredImageSpan(_trash_drawable(R.drawable.msg_delete))
+        span.setSize(_dp(13))
+        span.setTranslateX(-3.0)
+        span.setOverrideColor(jint(Theme.getColor(Theme.key_text_RedBold)))
+        text.insert(0, _ICON)
+        text.setSpan(span, 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
+        added = int(Layout.getDesiredWidth(text, paint) - before + 0.999)
+        _set_int(cell, "timeTextWidth", int(field(cell, "timeTextWidth") or 0) + added)
+        _set_int(cell, "timeWidth", int(field(cell, "timeWidth") or 0) + added)
+        if field(cell, "timeLayout") is not None:
+            from hook_utils import set_private_field
+
+            layout = StaticLayout(
+                text,
+                paint,
+                int(field(cell, "timeTextWidth")) + _dp(100),
+                Layout.Alignment.ALIGN_NORMAL,
+                1.0,
+                0.0,
+                False,
+            )
+            set_private_field(cell, "timeLayout", layout)

src/jutil.py

@@ -0,0 +1,92 @@
+"""Chaquopy/Java helpers shared by the hooks."""
+
+import diag
+
+
+def java_list(items):
+    """A java.util.List as a Python list (Java lists aren't iterable here)."""
+    if items is None:
+        return []
+    return [items.get(i) for i in range(items.size())]
+
+
+def java_ints(items):
+    return [int(v) for v in java_list(items)]
+
+
+def java_class(name):
+    """The real java.lang.Class: find_class returns a Chaquopy wrapper whose
+    getClass() is the Class (see chatSummaries/hooks/unread_hook.py)."""
+    from hook_utils import find_class
+
+    wrapper = find_class(name)
+    if wrapper is None:
+        return None
+    try:
+        return wrapper.getClass()
+    except Exception:
+        return wrapper
+
+
+def methods_named(class_name, name):
+    cls = java_class(class_name)
+    if cls is None:
+        diag.log(f"class not found: {class_name}")
+        return []
+    return [m for m in cls.getDeclaredMethods() if m.getName() == name]
+
+
+def hook_methods(plugin, class_name, name, hook, arity=None):
+    """Hooks every overload of `class_name.name` (or those with `arity`
+    parameters); returns the unhook handles."""
+    handles = []
+    for method in methods_named(class_name, name):
+        if arity is not None and len(method.getParameterTypes()) != arity:
+            continue
+        try:
+            handle = plugin.hook_method(method, hook)
+            if handle is not None:
+                handles.append(handle)
+        except Exception as exc:
+            diag.error(f"hook {class_name}.{name}", exc)
+    if not handles:
+        diag.log(f"nothing hooked for {class_name}.{name}")
+    return handles
+
+
+def field(obj, name):
+    """A (possibly private) field of a Java object."""
+    value = getattr(obj, name, None)
+    if value is not None:
+        return value
+    try:
+        from hook_utils import get_private_field
+
+        return get_private_field(obj, name)
+    except Exception:
+        return None
+
+
+def on_ui(fn, delay_ms=0):
+    from android_utils import run_on_ui_thread
+
+    def run():
+        try:
+            fn()
+        except Exception as exc:
+            diag.error("ui task", exc)
+
+    run_on_ui_thread(run, delay_ms)
+
+
+def in_background(fn):
+    """Runs `fn` off the UI thread; exceptions are logged, not lost."""
+    import threading
+
+    def run():
+        try:
+            fn()
+        except Exception as exc:
+            diag.error("background task", exc)
+
+    threading.Thread(target=run, daemon=True).start()

src/main.py

@@ -1,50 +1,159 @@
-from base_plugin import BasePlugin, HookResult, HookStrategy
+from base_plugin import BasePlugin, HookResult
-from android_utils import log
+from ui.settings import Header, Input, Selector, Switch, Text
-from ui.settings import Header, Input, Text
-from greeting import render, TemplateError
 
-DEFAULT_TEMPLATE = "Hello, {name}!"
+import accounts
+import diag
+from api import Api
+from config import (
+    ALPHA_CHOICES,
+    API_TOKEN,
+    DEFAULTS,
+    CACHE_DAYS,
+    CACHE_DAYS_CHOICES,
+    DELETED_ALPHA,
+    KEEP_DELETED,
+    REPORT_DELETIONS,
+    RESTORE_MISSING,
+    SERVER_URL,
+)
+from hooks.chat import EDIT_UPDATES, ChatSync
+from hooks.deletes import UPDATES, Deletes
+from hooks.links import Links
+from hooks.menu import Menu
+from hooks.render import Render
+from jutil import in_background, on_ui
+from views.history import History
 
 
-class HelloPlugin(BasePlugin):
+def _bulletin(text, error=False):
+    def show():
+        from ui.bulletin import BulletinHelper
+
+        (BulletinHelper.show_error if error else BulletinHelper.show_info)(text)
+
+    on_ui(show)
+
+
+class MessageLoggerPlugin(BasePlugin):
     def on_plugin_load(self):
-        log("hello_bundle loaded")
+        self.api = Api(self)
-        self.add_on_send_message_hook()
+        self.history = History(self, self.api)
+        self.render = Render(self)
+        self.chats = ChatSync(self, self.api)
+        self.deletes = Deletes(self, self.api, self.chats)
+        self.links = Links(self)
+        self.menu = Menu(self, self.history.open)
+        for part in (self.render, self.chats, self.deletes, self.links, self.menu):
+            try:
+                part.install()
+            except Exception as exc:
+                diag.error(f"install {type(part).__name__}", exc)
+        in_background(accounts.refresh)
+        in_background(self.purge_cache)
+        diag.log("loaded")
+
+    def purge_cache(self, force=False):
+        """Removes cached answers older than the configured lifetime; at most
+        once a day (the day turns at local midnight) unless `force`."""
+        import store
+
+        index = int(self.get_setting(CACHE_DAYS, DEFAULTS[CACHE_DAYS]) or 0)
+        index = max(0, min(index, len(CACHE_DAYS_CHOICES) - 1))
+        store.purge_old(CACHE_DAYS_CHOICES[index][1], force=force)
 
     def on_plugin_unload(self):
-        log("hello_bundle unloaded")
+        for part in ("render", "chats", "deletes", "links", "menu"):
+            if hasattr(self, part):
+                getattr(self, part).uninstall()
+        diag.log("unloaded")
+
+    def on_update_hook(self, update_name, account, update):
+        if update_name in EDIT_UPDATES:
+            try:
+                self.chats.on_edited(account, update.message)
+            except Exception as exc:
+                diag.error("on_update_hook edit", exc)
+            return HookResult()
+        if update_name in UPDATES:
+            try:
+                return self.deletes.on_update(update_name, account, update)
+            except Exception as exc:
+                diag.error("on_update_hook", exc)
+        return HookResult()
+
+    # settings
+
+    def _test_connection(self, _view=None):
+        def run():
+            if not self.api.configured:
+                _bulletin("Message Logger: set the server URL and API tokens", True)
+                return
+            lines, failed = [], False
+            for prefix, me in self.api.me():
+                if isinstance(me, dict):
+                    lines.append(f"{me.get('master_name')} ✓")
+                else:
+                    failed = True
+                    lines.append(f"{prefix}…: {me}")
+            _bulletin("Masters: " + "; ".join(lines), failed)
+
+        in_background(run)
 
     def create_settings(self):
         return [
-            Header(text="Hello Bundle"),
+            Header(text="Server"),
             Input(
-                key="template",
+                key=SERVER_URL,
-                text="Greeting template",
+                text="telegram-panel URL",
-                default=DEFAULT_TEMPLATE,
+                default=DEFAULTS[SERVER_URL],
-                subtext="Use {name} as placeholder.",
+                subtext="e.g. https://panel.example.com",
-                icon="msg_edit",
+                icon="msg_link",
             ),
-            Text(
+            Input(
-                text="Example",
+                key=API_TOKEN,
-                subtext=".hello alice smith -> Hello, Alice Smith!",
+                text="API tokens",
-                icon="msg_info",
+                default=DEFAULTS[API_TOKEN],
+                subtext="One per master, separated by spaces (panel: Settings → API Tokens)",
+                icon="msg_permissions",
+            ),
+            Text(text="Test connection", icon="msg_info", on_click=self._test_connection),
+            Header(text="Deleted messages"),
+            Switch(
+                key=KEEP_DELETED,
+                text="Keep deleted messages",
+                default=DEFAULTS[KEEP_DELETED],
+                subtext="Messages others delete stay in the chat",
+                icon="msg_delete",
+            ),
+            Switch(
+                key=RESTORE_MISSING,
+                text="Restore from logger",
+                default=DEFAULTS[RESTORE_MISSING],
+                subtext="Bring back logged messages deleted while the app was closed",
+                icon="msg_retry",
+            ),
+            Switch(
+                key=REPORT_DELETIONS,
+                text="Report deletions",
+                default=DEFAULTS[REPORT_DELETIONS],
+                subtext="Tell the server about deletions this client sees",
+                icon="msg_sync",
+            ),
+            Selector(
+                key=CACHE_DAYS,
+                text="Cache lifetime",
+                default=DEFAULTS[CACHE_DAYS],
+                items=[label for label, _ in CACHE_DAYS_CHOICES],
+                icon="msg_clear",
+                on_change=lambda _index: in_background(
+                    lambda: self.purge_cache(force=True)
+                ),
+            ),
+            Selector(
+                key=DELETED_ALPHA,
+                text="Deleted message opacity",
+                default=DEFAULTS[DELETED_ALPHA],
+                items=[label for label, _ in ALPHA_CHOICES],
+                icon="msg_hide",
             ),
         ]
-
-    def on_send_message_hook(self, account, params):
-        message = getattr(params, "message", None)
-        if not isinstance(message, str):
-            return HookResult()
-        stripped = message.strip()
-        if not stripped.startswith(".hello"):
-            return HookResult()
-        parts = stripped.split(" ", 1)
-        name = parts[1] if len(parts) > 1 else ""
-        if not name.strip():
-            params.message = "Usage: .hello <name>"
-        else:
-            try:
-                params.message = render(self.get_setting("template", DEFAULT_TEMPLATE), name)
-            except TemplateError as exc:
-                params.message = "Bad template: " + str(exc)
-        return HookResult(strategy=HookStrategy.MODIFY, params=params)

src/peers.py

@@ -0,0 +1,47 @@
+"""Telegram Android dialog ids <-> the server's marked (Telethon) chat ids.
+
+Android: users are positive, basic groups and channels both `-id`.
+Telethon: users positive, basic groups `-id`, channels `-(10**12 + id)`.
+"""
+
+CHANNEL_OFFSET = 10**12
+
+
+def _controller(account):
+    from org.telegram.messenger import MessagesController
+
+    return MessagesController.getInstance(account)
+
+
+def is_channel_dialog(account, dialog_id):
+    if dialog_id >= 0:
+        return False
+    from org.telegram.messenger import ChatObject
+
+    chat = _controller(account).getChat(-dialog_id)
+    return chat is not None and ChatObject.isChannel(chat)
+
+
+def marked_chat_id(account, dialog_id):
+    """The server's chat id for a dialog, or None (secret chats etc.)."""
+    from org.telegram.messenger import DialogObject
+
+    dialog_id = int(dialog_id)
+    if DialogObject.isEncryptedDialog(dialog_id):
+        return None
+    if dialog_id > 0:
+        return dialog_id
+    if is_channel_dialog(account, dialog_id):
+        return -(CHANNEL_OFFSET + -dialog_id)
+    return dialog_id
+
+
+def channel_id_from_marked(chat_id):
+    """Channel id of a marked `-100…` chat id."""
+    return -int(chat_id) - CHANNEL_OFFSET
+
+
+def own_user_id(account):
+    from org.telegram.messenger import UserConfig
+
+    return int(UserConfig.getInstance(account).getClientUserId())

src/store.py

@@ -0,0 +1,339 @@
+"""What the plugin knows per message: server state (edits, deletion, copy
+pointers) and deletions this client saw itself.
+
+Both are cached in SQLite and loaded per chat on first use: a chat opened
+again shows its marks at once, before (or without) the server, and a
+message the plugin kept on screen still looks deleted after a restart.
+
+Per chat the range of message ids already checked with the server (and
+when) is kept too (`coverage`): see hooks/chat.py for when it is extended,
+renewed or expired. An expired chat keeps its cache (shown meanwhile) until
+the next successful check replaces it. Independently, cached answers older
+than the configured number of days are removed, checked once a day
+(`purge_old`).
+"""
+
+import json
+import os
+import sqlite3
+import threading
+import time
+
+import diag
+
+
+class State:
+    __slots__ = (
+        "edit_count",
+        "deleted",
+        "logged",
+        "history",
+        "source_date",
+        "sender_id",
+        "raw",
+    )
+
+    def __init__(self):
+        self.edit_count = 0
+        self.deleted = False
+        self.logged = None  # {"chat_id", "message_id", "topic_id"}
+        self.history = None
+        self.source_date = None  # ISO string
+        self.sender_id = None
+        self.raw = None  # the server's answer for it
+
+    @classmethod
+    def from_server(cls, data):
+        state = cls()
+        state.edit_count = int(data.get("edit_count") or 0)
+        state.deleted = data.get("deleted_at") is not None
+        state.logged = data.get("logged")
+        state.history = data.get("history")
+        state.source_date = data.get("source_date")
+        state.sender_id = data.get("sender_id")
+        state.raw = data
+        return state
+
+
+_lock = threading.RLock()
+# (account, dialog_id) -> {message_id: State}
+_states = {}
+# (account, dialog_id) -> set of message ids deleted while we watched
+_local = {}
+_loaded = set()
+# (account, message_id) -> monotonic time the user deleted it here
+_own = {}
+# (account, dialog_id) -> (low, high, checked_at)
+_coverage = {}
+_purged_on = None  # local date of the last age purge
+_db = None
+_OWN_TTL = 120
+
+
+def _conn():
+    global _db
+    if _db is None:
+        from file_utils import get_files_dir
+
+        directory = os.path.join(get_files_dir(), "message_logger")
+        os.makedirs(directory, exist_ok=True)
+        _db = sqlite3.connect(
+            os.path.join(directory, "state.db"), check_same_thread=False
+        )
+        _db.execute(
+            "CREATE TABLE IF NOT EXISTS deleted ("
+            "account INTEGER, dialog_id INTEGER, message_id INTEGER, at REAL, "
+            "PRIMARY KEY (account, dialog_id, message_id))"
+        )
+        _db.execute(
+            "CREATE TABLE IF NOT EXISTS states ("
+            "account INTEGER, dialog_id INTEGER, message_id INTEGER, data TEXT, "
+            "at REAL, PRIMARY KEY (account, dialog_id, message_id))"
+        )
+        _db.execute("CREATE TABLE IF NOT EXISTS meta (key TEXT PRIMARY KEY, value TEXT)")
+        _db.execute(
+            "CREATE TABLE IF NOT EXISTS coverage ("
+            "account INTEGER, dialog_id INTEGER, low INTEGER, high INTEGER, at REAL, "
+            "PRIMARY KEY (account, dialog_id))"
+        )
+        _db.commit()
+    return _db
+
+
+def _local_ids(account, dialog_id):
+    """Local deletions of a chat; its cached states are loaded alongside."""
+    key = (account, dialog_id)
+    if key not in _loaded:
+        _loaded.add(key)
+        try:
+            db = _conn()
+            rows = db.execute(
+                "SELECT message_id FROM deleted WHERE account=? AND dialog_id=?",
+                key,
+            ).fetchall()
+            _local.setdefault(key, set()).update(r[0] for r in rows)
+            states = _states.setdefault(key, {})
+            for message_id, data in db.execute(
+                "SELECT message_id, data FROM states WHERE account=? AND dialog_id=?",
+                key,
+            ).fetchall():
+                states.setdefault(message_id, State.from_server(json.loads(data)))
+            row = db.execute(
+                "SELECT low, high, at FROM coverage WHERE account=? AND dialog_id=?",
+                key,
+            ).fetchone()
+            if row is not None:
+                _coverage.setdefault(key, tuple(row))
+        except Exception as exc:
+            diag.error("store.load", exc)
+    return _local.setdefault(key, set())
+
+
+def get(account, dialog_id, message_id):
+    with _lock:
+        local = _local_ids(account, dialog_id)  # loads the chat's cache
+        state = _states.get((account, dialog_id), {}).get(message_id)
+        if message_id in local:
+            if state is None:
+                state = State()
+                _states.setdefault((account, dialog_id), {})[message_id] = state
+            state.deleted = True
+        return state
+
+
+def is_deleted(account, dialog_id, message_id):
+    state = get(account, dialog_id, message_id)
+    return state is not None and state.deleted
+
+
+def is_edited(account, dialog_id, message_id):
+    state = get(account, dialog_id, message_id)
+    return state is not None and state.edit_count > 0
+
+
+def put_server_states(account, dialog_id, items):
+    """Server state of messages (sync, lookups), kept and cached."""
+    if not items:
+        return
+    with _lock:
+        _local_ids(account, dialog_id)  # load the chat's cache first
+        states = _states.setdefault((account, dialog_id), {})
+        for data in items:
+            states[int(data["message_id"])] = State.from_server(data)
+        now = time.time()
+        try:
+            db = _conn()
+            db.executemany(
+                "INSERT OR REPLACE INTO states VALUES (?, ?, ?, ?, ?)",
+                [
+                    (account, dialog_id, int(d["message_id"]), json.dumps(d), now)
+                    for d in items
+                ],
+            )
+            db.commit()
+        except Exception as exc:
+            diag.error("store.put_server_states", exc)
+
+
+def cached_deleted(account, dialog_id, low, high):
+    """Cached server answers of deleted messages with a logged copy in
+    [low, high] (what a restore needs, without asking the server again)."""
+    with _lock:
+        _local_ids(account, dialog_id)
+        return [
+            state.raw
+            for message_id, state in _states.get((account, dialog_id), {}).items()
+            if low <= message_id <= high
+            and state.raw is not None
+            and state.raw.get("deleted_at")
+            and state.raw.get("logged")
+        ]
+
+
+def coverage(account, dialog_id):
+    """(low, high, checked_at) of the ids already checked, else None."""
+    with _lock:
+        _local_ids(account, dialog_id)
+        return _coverage.get((account, dialog_id))
+
+
+def set_coverage(account, dialog_id, low, high, at):
+    with _lock:
+        _coverage[(account, dialog_id)] = (int(low), int(high), float(at))
+        try:
+            db = _conn()
+            db.execute(
+                "INSERT OR REPLACE INTO coverage VALUES (?, ?, ?, ?, ?)",
+                (account, dialog_id, int(low), int(high), float(at)),
+            )
+            db.commit()
+        except Exception as exc:
+            diag.error("store.set_coverage", exc)
+
+
+def expire_coverage(account, dialog_id):
+    """An edit/delete happened in the chat: check it again on next look."""
+    current = coverage(account, dialog_id)
+    if current is not None:
+        set_coverage(account, dialog_id, current[0], current[1], 0.0)
+
+
+def replace_window(account, dialog_id, low, high, items, capped, full=False):
+    """A sync's answer for messages [low, high]: cached marks it no longer
+    reports there are dropped (and returned) — all of the chat's when `full`
+    (a fresh check replaces the old cache). A capped answer (the newest marks
+    only) is complete from its oldest mark up."""
+    if capped and items:
+        low = max(low, min(int(d["message_id"]) for d in items))
+    keep = {int(d["message_id"]) for d in items}
+    with _lock:
+        _local_ids(account, dialog_id)
+        states = _states.setdefault((account, dialog_id), {})
+        stale = [
+            i for i in states if (full or low <= i <= high) and i not in keep
+        ]
+        for i in stale:
+            del states[i]
+        try:
+            db = _conn()
+            db.executemany(
+                "DELETE FROM states WHERE account=? AND dialog_id=? AND message_id=?",
+                [(account, dialog_id, i) for i in stale],
+            )
+            db.commit()
+        except Exception as exc:
+            diag.error("store.replace_window", exc)
+    put_server_states(account, dialog_id, items)
+    return stale
+
+
+def mark_deleted(account, dialog_id, message_ids):
+    """Deletions this client saw (kept on screen or confirmed missing)."""
+    ids = [int(i) for i in message_ids]
+    with _lock:
+        _local_ids(account, dialog_id).update(ids)
+        now = time.time()
+        try:
+            db = _conn()
+            db.executemany(
+                "INSERT OR IGNORE INTO deleted VALUES (?, ?, ?, ?)",
+                [(account, dialog_id, i, now) for i in ids],
+            )
+            db.commit()
+        except Exception as exc:
+            diag.error("store.mark_deleted", exc)
+
+
+def forget_deleted(account, dialog_id, message_ids):
+    """The user deleted kept messages themselves: stop tracking them."""
+    ids = [int(i) for i in message_ids]
+    with _lock:
+        _local_ids(account, dialog_id).difference_update(ids)
+        states = _states.get((account, dialog_id), {})
+        for i in ids:
+            states.pop(i, None)
+        try:
+            db = _conn()
+            for table in ("deleted", "states"):
+                db.executemany(
+                    f"DELETE FROM {table} WHERE account=? AND dialog_id=? AND message_id=?",
+                    [(account, dialog_id, i) for i in ids],
+                )
+            db.commit()
+        except Exception as exc:
+            diag.error("store.forget_deleted", exc)
+
+
+def note_own_deletion(account, message_ids):
+    now = time.monotonic()
+    with _lock:
+        for key in [k for k, at in _own.items() if now - at > _OWN_TTL]:
+            del _own[key]
+        for i in message_ids:
+            _own[(account, int(i))] = now
+
+
+def is_own_deletion(account, message_id):
+    with _lock:
+        return (account, int(message_id)) in _own
+
+
+def purge_old(days, force=False):
+    """Removes cached server answers (marks, checked ranges) older than
+    `days` (None: never), at most once per local calendar day unless
+    `force`. Local deletion records are kept: they are what this client saw,
+    not a copy of the server."""
+    import datetime
+
+    global _purged_on
+    today = datetime.date.today().isoformat()
+    if not force and _purged_on == today:
+        return 0
+    with _lock:
+        try:
+            db = _conn()
+            row = db.execute("SELECT value FROM meta WHERE key='purged_on'").fetchone()
+            if not force and row is not None and row[0] == today:
+                _purged_on = today
+                return 0
+            removed = 0
+            if days is not None:
+                cutoff = time.time() - days * 86400
+                removed = db.execute("DELETE FROM states WHERE at < ?", (cutoff,)).rowcount
+                db.execute("DELETE FROM coverage WHERE at < ?", (cutoff,))
+            db.execute(
+                "INSERT OR REPLACE INTO meta VALUES ('purged_on', ?)", (today,)
+            )
+            db.commit()
+            _purged_on = today
+        except Exception as exc:
+            diag.error("store.purge_old", exc)
+            return 0
+        if removed:
+            # Reload chats from the database on next use.
+            _states.clear()
+            _coverage.clear()
+            _loaded.clear()
+            _local.clear()
+        diag.log(f"cache purge (older than {days} days): {removed} marks removed")
+        return removed

src/textutil.py

@@ -1,2 +0,0 @@
-def normalize(name: str) -> str:
-    return " ".join(w[:1].upper() + w[1:] for w in name.split())

src/tg.py

@@ -0,0 +1,128 @@
+"""Telegram requests through the client's own session.
+
+Sent with ConnectionsManager.sendRequest and a Java RequestDelegate proxy,
+kept strongly referenced until it fires: on 12.10.6 the SDK's send_request
+never invoked the callback for these requests.
+"""
+
+import threading
+
+import diag
+from jutil import java_list
+
+_pending = set()
+_lock = threading.Lock()
+
+
+_Delegate = None
+
+
+def _delegate_class():
+    """A Java RequestDelegate calling a Python function (created once)."""
+    global _Delegate
+    if _Delegate is None:
+        from java import dynamic_proxy
+        from org.telegram.tgnet import RequestDelegate
+
+        class Delegate(dynamic_proxy(RequestDelegate)):
+            def __init__(self, fn):
+                super().__init__()
+                self.fn = fn
+
+            def run(self, response, error):
+                self.fn(response, error)
+
+        _Delegate = Delegate
+    return _Delegate
+
+
+def _send(account, request, callback):
+    from org.telegram.tgnet import ConnectionsManager
+
+    box = []
+
+    def done(response, error):
+        with _lock:
+            for proxy in box:
+                _pending.discard(proxy)
+        try:
+            callback(response, error)
+        except Exception as exc:
+            diag.error("tg callback", exc)
+
+    delegate = _delegate_class()(done)
+    box.append(delegate)
+    with _lock:
+        _pending.add(delegate)
+    ConnectionsManager.getInstance(account).sendRequest(request, delegate)
+
+
+def _message_ids(ids):
+    """getMessages ids: ArrayList<Integer>. `jint` forces Integer boxing;
+    a plain Python int (even from Integer.valueOf) is boxed as Long, which
+    fails serialization on the network thread without any callback."""
+    from java import jint
+    from java.util import ArrayList
+
+    items = ArrayList()
+    for i in ids:
+        items.add(jint(int(i)))
+    return items
+
+
+def channel_chat(account, channel_id):
+    """The cached TLRPC.Chat of a channel, loading it from storage if needed."""
+    from org.telegram.messenger import MessagesController, MessagesStorage
+
+    controller = MessagesController.getInstance(account)
+    chat = controller.getChat(int(channel_id))
+    if chat is None:
+        try:
+            chat = MessagesStorage.getInstance(account).getChatSync(int(channel_id))
+            if chat is not None:
+                controller.putChat(chat, True)
+        except Exception as exc:
+            diag.error("tg.channel_chat", exc)
+    return chat
+
+
+def get_messages(account, dialog_id, ids, callback):
+    """Fetches `ids` of a dialog (a channel when `dialog_id` is one).
+
+    `callback(messages, error_text)`: messages by id (TL_messageEmpty for
+    deleted ones), or None and an error.
+    """
+    from org.telegram.messenger import ChatObject, MessagesController
+    from org.telegram.tgnet import TLRPC
+
+    controller = MessagesController.getInstance(account)
+    dialog_id = int(dialog_id)
+    chat = channel_chat(account, -dialog_id) if dialog_id < 0 else None
+    if chat is not None and ChatObject.isChannel(chat):
+        request = TLRPC.TL_channels_getMessages()
+        request.channel = controller.getInputChannel(chat)
+        if request.channel is None or getattr(request.channel, "access_hash", 0) == 0:
+            callback(None, "not a member of that chat")
+            return
+    elif dialog_id < 0 and chat is None:
+        callback(None, "chat not found (not a member?)")
+        return
+    else:
+        request = TLRPC.TL_messages_getMessages()
+    request.id = _message_ids(ids)
+
+    def done(response, error):
+        if error is not None or response is None:
+            callback(None, getattr(error, "text", None) or "request failed")
+            return
+        try:
+            controller.putUsers(response.users, False)
+            controller.putChats(response.chats, False)
+        except Exception:
+            pass
+        found = {}
+        for message in java_list(response.messages):
+            found[int(message.id)] = message
+        callback(found, None)
+
+    _send(account, request, done)

src/views/history.py

@@ -0,0 +1,368 @@
+"""Edit history as a mock chat: every version of a message drawn as a native
+message bubble, in a bottom sheet over the chat wallpaper.
+
+The versions live in the logger's activity group, re-posted without a header.
+Only a member can read them (and load their media): the master account owning
+the logger groups, or another account in that group. When one is signed in on
+this device, the versions are fetched and drawn through it (the account viewing
+the history if it can); otherwise the server's text is shown and each media is
+marked unavailable. Posts of the logger groups themselves (saved posts, history
+messages) open the history of the message they belong to.
+"""
+
+import accounts
+import diag
+import peers
+import tg
+from api import ApiError
+from jutil import in_background, on_ui
+
+_MEDIA_NAMES = {
+    "photo": "Photo",
+    "video": "Video",
+    "animation": "GIF",
+    "audio": "Audio",
+    "voice": "Voice message",
+    "video_note": "Video message",
+    "sticker": "Sticker",
+    "document": "File",
+}
+
+
+def _bulletin(text, error=False):
+    def show():
+        from ui.bulletin import BulletinHelper
+
+        (BulletinHelper.show_error if error else BulletinHelper.show_info)(text)
+
+    on_ui(show)
+
+
+def _when(iso):
+    if not iso:
+        return ""
+    from datetime import datetime
+
+    try:
+        return datetime.fromisoformat(iso).astimezone().strftime("%d %b %Y, %H:%M")
+    except ValueError:
+        return iso
+
+
+def _epoch(iso):
+    if not iso:
+        return 0
+    from datetime import datetime
+
+    try:
+        return int(datetime.fromisoformat(iso).timestamp())
+    except ValueError:
+        return 0
+
+
+def _entities(items):
+    """Telethon entity dicts (server) -> TLRPC entities."""
+    from java.util import ArrayList
+    from org.telegram.tgnet import TLRPC
+
+    out = ArrayList()
+    for item in items:
+        name = str(item.get("_", ""))
+        cls = getattr(TLRPC, "TL_" + name[:1].lower() + name[1:], None) if name else None
+        if cls is None:
+            continue
+        entity = cls()
+        entity.offset = int(item["offset"])
+        entity.length = int(item["length"])
+        for key in ("url", "language", "document_id"):
+            if item.get(key) is not None and hasattr(entity, key):
+                setattr(entity, key, item[key])
+        out.add(entity)
+    return out
+
+
+def _utf16(text):
+    return len(text.encode("utf-16-le")) // 2
+
+
+class History:
+    def __init__(self, plugin, api):
+        self.plugin = plugin
+        self.api = api
+
+    def open(self, message):
+        """Shows the edit history of a MessageObject."""
+        if message is None:
+            return
+        if not self.api.configured:
+            _bulletin("Message Logger: set the server URL and API token first", True)
+            return
+        account = int(message.currentAccount)
+        chat_id = peers.marked_chat_id(account, int(message.getDialogId()))
+        if chat_id is None or int(message.getId()) <= 0:
+            _bulletin("No edit history for this message")
+            return
+        in_background(lambda: self._load(message, account, chat_id))
+
+    def _load(self, original, account, chat_id):
+        try:
+            result = self.api.versions(
+                peers.own_user_id(account), chat_id, int(original.getId())
+            )
+        except ApiError as exc:
+            _bulletin(f"Message Logger: {exc}", True)
+            return
+        versions = (result or {}).get("versions") or []
+        if len(versions) < 2:
+            _bulletin("No edits logged for this message")
+            return
+        ids = [int(v["message_id"]) for v in versions if v.get("message_id")]
+        if not result.get("chat_id") or not ids:
+            on_ui(lambda: self._show(original, versions, None, {}, None))
+            return
+        channel_id = peers.channel_id_from_marked(result["chat_id"])
+        # Whoever can read the activity group: this account, the master, or
+        # any other signed-in member.
+        readers = accounts.with_access(
+            -channel_id, prefer=(account, accounts.slot_of(result.get("master_tg_id")))
+        )
+        if not readers:
+            on_ui(lambda: self._show(original, versions, None, {}, None))
+            return
+        reader = readers[0]
+        # The history topic, at its newest version.
+        topic = (channel_id, result.get("topic_id"), ids[-1])
+
+        def done(found, error):
+            if found is None:
+                diag.log(f"history: activity group unreadable: {error}")
+                found = {}
+            on_ui(lambda: self._show(original, versions, reader, found, topic))
+
+        tg.get_messages(reader, -channel_id, ids, done)
+
+    # building the mock messages
+
+    def _base(self, original, version):
+        from org.telegram.tgnet import TLRPC
+
+        owner = original.messageOwner
+        msg = TLRPC.TL_message()
+        # Its own (negative) id: the original's would give the bubbles the
+        # original's marks (a deleted message's trash icon and opacity).
+        msg.id = -(int(version.get("version") or 0) + 1)
+        msg.dialog_id = int(original.getDialogId())
+        msg.peer_id = owner.peer_id
+        msg.from_id = owner.from_id
+        msg.flags |= 256
+        msg.out = bool(owner.out)
+        msg.date = _epoch(version.get("edit_date")) or int(owner.date)
+        return msg
+
+    def _from_copy(self, original, version, copy):
+        from org.telegram.tgnet import TLRPC
+
+        msg = self._base(original, version)
+        msg.message = copy.message or ""
+        msg.entities = copy.entities
+        media = getattr(copy, "media", None)
+        if media is not None and not isinstance(media, TLRPC.TL_messageMediaEmpty):
+            msg.media = media
+            msg.flags |= 512
+        rich = getattr(copy, "rich_message", None)
+        if rich is not None:
+            msg.rich_message = rich
+            msg.flags2 |= 1 << 12
+        return msg
+
+    def _from_text(self, original, version):
+        """The server's text; each media marked unavailable after it."""
+        from org.telegram.tgnet import TLRPC
+
+        msg = self._base(original, version)
+        text = version.get("text") or ""
+        entities = _entities(version.get("entities") or [])
+        notes = [
+            f"🚫 {_MEDIA_NAMES.get(kind, 'Media')} unavailable"
+            for kind in version.get("media") or []
+        ]
+        if notes:
+            note = "\n".join(notes) + "\n(sign in an account of the logger's groups to load media)"
+            start = _utf16(text) + (2 if text else 0)
+            text = (text + "\n\n" if text else "") + note
+            italic = TLRPC.TL_messageEntityItalic()
+            italic.offset = start
+            italic.length = _utf16(note)
+            entities.add(italic)
+        msg.message = text or "(empty)"
+        msg.entities = entities
+        return msg
+
+    def _message_object(self, account, original, msg):
+        from org.telegram.messenger import MessageObject, MessagesController
+
+        viewer = int(original.currentAccount)
+        if account != viewer:
+            # The bubble is drawn as the reading account (media); names come
+            # from the viewer's cache.
+            source = MessagesController.getInstance(viewer)
+            target = MessagesController.getInstance(account)
+            sender = original.getFromChatId()
+            if sender > 0 and source.getUser(sender) is not None:
+                target.putUser(source.getUser(sender), True)
+            elif sender < 0 and source.getChat(-sender) is not None:
+                target.putChat(source.getChat(-sender), True)
+        return MessageObject(account, msg, True, True)
+
+    # the sheet
+
+    def _show(self, original, versions, reader, found, topic):
+        from android.view import Gravity
+        from android.widget import LinearLayout, ScrollView, TextView
+        from client_utils import get_last_fragment
+        from java import jint
+        from org.telegram.messenger import AndroidUtilities
+        from org.telegram.ui.ActionBar import BottomSheet, Theme
+
+        fragment = get_last_fragment()
+        context = fragment.getParentActivity() if fragment is not None else None
+        if context is None:
+            return
+        dp = AndroidUtilities.dp
+        column = LinearLayout(context)
+        column.setOrientation(LinearLayout.VERTICAL)
+        column.setPadding(0, dp(8), 0, dp(12))
+        last = len(versions) - 1
+        for index, version in enumerate(versions):
+            label = "Original" if version["version"] == 0 else f"Edit {version['version']}"
+            if index == last:
+                label += " · current"
+            when = _when(version.get("edit_date"))
+            column.addView(self._service(context, f"{label} · {when}" if when else label))
+            copy = found.get(int(version.get("message_id") or 0)) if reader is not None else None
+            if copy is not None and not isinstance(copy, _message_empty()):
+                msg, account = self._from_copy(original, version, copy), reader
+            else:
+                msg, account = self._from_text(original, version), int(original.currentAccount)
+            try:
+                column.addView(
+                    self._bubble(context, account, self._message_object(account, original, msg), version)
+                )
+            except Exception as exc:
+                diag.error("history.bubble", exc)
+
+        scroll = ScrollView(context)
+        scroll.addView(column)
+        wallpaper = Theme.getCachedWallpaper()
+        if wallpaper is not None:
+            scroll.setBackground(wallpaper)
+        else:
+            scroll.setBackgroundColor(Theme.getColor(Theme.key_windowBackgroundGray))
+
+        root = LinearLayout(context)
+        root.setOrientation(LinearLayout.VERTICAL)
+        header = LinearLayout(context)
+        header.setOrientation(LinearLayout.HORIZONTAL)
+        header.setGravity(Gravity.CENTER_VERTICAL)
+        title = TextView(context)
+        title.setText("Edit history" + ("" if reader is not None else " · media unavailable"))
+        title.setTextSize(17)
+        title.setTextColor(jint(Theme.getColor(Theme.key_dialogTextBlack)))
+        title.setPadding(dp(20), dp(14), dp(12), dp(12))
+        header.addView(title, LinearLayout.LayoutParams(0, -2, 1.0))
+        sheet = BottomSheet(context, False)
+        if reader is not None and topic is not None and topic[1]:
+            header.addView(self._topic_button(context, sheet, fragment, reader, topic))
+        root.addView(header)
+        root.addView(
+            scroll,
+            LinearLayout.LayoutParams(-1, int(AndroidUtilities.displaySize.y * 0.7)),
+        )
+
+        sheet.setCustomView(root)
+        sheet.show()
+
+    def _topic_button(self, context, sheet, fragment, reader, topic):
+        """Opens the history topic of the activity group, as `reader` (an
+        account that can read it) when the current one can't."""
+        from android.widget import TextView
+        from android_utils import OnClickListener
+        from java import jint
+        from org.telegram.messenger import AndroidUtilities
+        from org.telegram.ui.ActionBar import Theme
+
+        from views import open_as
+
+        dp = AndroidUtilities.dp
+        button = TextView(context)
+        button.setText("Open topic")
+        button.setTextSize(15)
+        button.setTextColor(jint(Theme.getColor(Theme.key_dialogTextBlue2)))
+        button.setPadding(dp(12), dp(14), dp(20), dp(12))
+        channel_id, topic_id, message_id = topic
+
+        def open_topic(_view):
+            sheet.dismiss()
+            open_as.open_topic(fragment, reader, channel_id, topic_id, message_id)
+
+        button.setOnClickListener(OnClickListener(open_topic))
+        return button
+
+    def _service(self, context, text):
+        """A date-like service pill above each version."""
+        from android.view import Gravity
+        from android.widget import FrameLayout, TextView
+        from java import jint
+        from org.telegram.messenger import AndroidUtilities
+        from org.telegram.ui.ActionBar import Theme
+
+        dp = AndroidUtilities.dp
+        pill = TextView(context)
+        pill.setText(text)
+        pill.setTextSize(13)
+        pill.setTextColor(jint(Theme.getColor(Theme.key_chat_serviceText)))
+        pill.setPadding(dp(10), dp(3), dp(10), dp(4))
+        pill.setBackground(
+            Theme.createRoundRectDrawable(
+                dp(12), jint(Theme.getColor(Theme.key_chat_serviceBackground))
+            )
+        )
+        holder = FrameLayout(context)
+        holder.setPadding(0, dp(10), 0, dp(4))
+        params = FrameLayout.LayoutParams(-2, -2)
+        params.gravity = Gravity.CENTER_HORIZONTAL
+        holder.addView(pill, params)
+        return holder
+
+    def _bubble(self, context, account, message_object, version):
+        """A ChatMessageCell for the version, under a layer taking its touches
+        (no chat delegate behind it); long-press copies the text."""
+        from android.view import View
+        from android.widget import FrameLayout
+        from android_utils import OnClickListener, OnLongClickListener, copy_to_clipboard
+        from org.telegram.ui.Cells import ChatMessageCell
+
+        cell = ChatMessageCell(context, account)
+        cell.setMessageObject(message_object, None, False, False, False)
+        holder = FrameLayout(context)
+        holder.addView(cell, FrameLayout.LayoutParams(-1, -2))
+        shield = View(context)
+        text = str(message_object.messageOwner.message or version.get("text") or "")
+
+        def copy(_view):
+            if text:
+                copy_to_clipboard(text)
+                _bulletin("Copied")
+            return True
+
+        shield.setOnClickListener(OnClickListener(lambda _view: None))
+        shield.setOnLongClickListener(OnLongClickListener(copy))
+        holder.addView(shield, FrameLayout.LayoutParams(-1, -1))
+        return holder
+
+
+def _message_empty():
+    from org.telegram.tgnet import TLRPC
+
+    return TLRPC.TL_messageEmpty
+

src/views/open_as.py

@@ -0,0 +1,100 @@
+"""Open a chat or a forum topic as a given signed-in account, on top of the
+current screen: BaseFragment.setCurrentAccount before presenting, so going
+back returns to the current account untouched.
+
+A topic is opened the way ForumUtilities.openTopic does it (which always uses
+the presenting fragment's account): its start message through
+setThreadMessages, the topic loaded through that account's TopicsController
+when not cached.
+"""
+
+import accounts
+import diag
+from jutil import on_ui
+
+
+def _opened_as(chat, slot):
+    from ui.bulletin import BulletinHelper
+
+    if slot == accounts.current_slot():
+        return
+    name = accounts.name_of(slot)
+    on_ui(lambda: BulletinHelper.show_info(f"Opened as {name}", chat), 300)
+
+
+def open_chat(fragment, slot, dialog_id, message_id=0):
+    """Presents a dialog (at `message_id`) as account `slot`. UI thread."""
+    from android.os import Bundle
+    from org.telegram.ui import ChatActivity
+
+    args = Bundle()
+    if dialog_id > 0:
+        args.putLong("user_id", int(dialog_id))
+    else:
+        args.putLong("chat_id", -int(dialog_id))
+    if message_id:
+        args.putInt("message_id", int(message_id))
+    chat = ChatActivity(args)
+    chat.setCurrentAccount(int(slot))
+    fragment.presentFragment(chat)
+    _opened_as(chat, slot)
+
+
+def open_topic(fragment, slot, channel_id, topic_id, message_id=0):
+    """Presents a forum topic (at `message_id`) as account `slot`; falls back
+    to the group at `message_id` when the topic can't be loaded. UI thread."""
+    from java import dynamic_proxy
+    from java.lang import Runnable
+    from org.telegram.messenger import MessagesController
+
+    topics = MessagesController.getInstance(int(slot)).getTopicsController()
+    topic = topics.findTopic(int(channel_id), int(topic_id))
+    if topic is not None and topic.topicStartMessage is not None:
+        _present_topic(fragment, slot, channel_id, topic, message_id)
+        return
+
+    class Loaded(dynamic_proxy(Runnable)):
+        def run(self):
+            def show():
+                found = topics.findTopic(int(channel_id), int(topic_id))
+                if found is not None and found.topicStartMessage is not None:
+                    _present_topic(fragment, slot, channel_id, found, message_id)
+                else:
+                    diag.log(f"topic {channel_id}/{topic_id} not loadable: opening the group")
+                    open_chat(fragment, slot, -int(channel_id), message_id)
+
+            on_ui(show)
+
+    _keep.append(Loaded())
+    topics.loadTopic(int(channel_id), int(topic_id), _keep[-1])
+
+
+_keep = []  # Runnables handed to Java, kept alive until called
+
+
+def _present_topic(fragment, slot, channel_id, topic, message_id):
+    from android.os import Bundle
+    from java.util import ArrayList
+    from org.telegram.messenger import MessageObject, MessagesController
+    from org.telegram.ui import ChatActivity
+
+    args = Bundle()
+    args.putLong("chat_id", int(channel_id))
+    if message_id:
+        args.putInt("message_id", int(message_id))
+    args.putInt("unread_count", int(topic.unread_count))
+    args.putBoolean("historyPreloaded", False)
+    chat = ChatActivity(args)
+    chat.setCurrentAccount(int(slot))
+    start = ArrayList()
+    start.add(MessageObject(int(slot), topic.topicStartMessage, False, False))
+    chat.setThreadMessages(
+        start,
+        MessagesController.getInstance(int(slot)).getChat(int(channel_id)),
+        int(topic.id),
+        int(topic.read_inbox_max_id),
+        int(topic.read_outbox_max_id),
+        topic,
+    )
+    fragment.presentFragment(chat)
+    _opened_as(chat, slot)

tools/verify_bundle.py

@@ -42,6 +42,27 @@ class HookStrategy(Enum):
 class HookResult:
     strategy: HookStrategy = HookStrategy.DEFAULT
     params: object = None
+    update: object = None
+
+
+class MenuItemType(Enum):
+    MESSAGE_CONTEXT_MENU = auto()
+
+
+@dataclass
+class MenuItemData:
+    menu_type: MenuItemType
+    text: str
+    on_click: object
+    item_id: object = None
+    icon: object = None
+    subtext: object = None
+    condition: object = None
+    priority: int = 0
+
+
+class MethodHook:
+    pass
 
 
 LOG_LINES: list[str] = []
@@ -84,6 +105,9 @@ def install_fakes() -> None:
     base_plugin_mod.BasePlugin = BasePlugin
     base_plugin_mod.HookResult = HookResult
     base_plugin_mod.HookStrategy = HookStrategy
+    base_plugin_mod.MenuItemData = MenuItemData
+    base_plugin_mod.MenuItemType = MenuItemType
+    base_plugin_mod.MethodHook = MethodHook
     sys.modules["base_plugin"] = base_plugin_mod
 
     android_utils_mod = types.ModuleType("android_utils")
@@ -94,18 +118,20 @@ def install_fakes() -> None:
     ui_mod.__path__ = []
     sys.modules["ui"] = ui_mod
 
+    import tempfile
+
+    file_utils_mod = types.ModuleType("file_utils")
+    _files = tempfile.mkdtemp(prefix="ml-verify-")
+    file_utils_mod.get_files_dir = lambda: _files
+    sys.modules["file_utils"] = file_utils_mod
+
     ui_settings_mod = types.ModuleType("ui.settings")
-    for cls_name in ("Header", "Input", "Text", "Switch"):
+    for cls_name in ("Header", "Input", "Text", "Switch", "Selector"):
         setattr(ui_settings_mod, cls_name, type(cls_name, (_SettingsRow,), {}))
     sys.modules["ui.settings"] = ui_settings_mod
     ui_mod.settings = ui_settings_mod
 
 
-class SimpleParams:
-    def __init__(self, message):
-        self.message = message
-
-
 KEY_TO_DUNDER = {
     "id": "__id__",
     "name": "__name__",
@@ -147,7 +173,7 @@ def main(argv=None) -> int:
     source = bundle_path.read_text(encoding="utf-8")
 
     modules_before = set(sys.modules)
-    ns = {"__name__": "hello_bundle"}
+    ns = {"__name__": "message_logger"}
     exec(compile(source, str(bundle_path), "exec"), ns)
     new_modules = set(sys.modules) - modules_before
 
@@ -194,63 +220,114 @@ def main(argv=None) -> int:
         )
 
         plugin = plugin_cls()
-        LOG_LINES.clear()
+        keys = {getattr(row, "key", None) for row in plugin.create_settings()}
-        plugin.on_plugin_load()
         check(
-            "on_plugin_load emits load log line",
+            "settings expose server URL and API token",
-            any("hello_bundle loaded" in line for line in LOG_LINES),
+            {"server_url", "api_token"} <= keys,
-            f"log lines: {LOG_LINES}",
+            f"keys: {keys}",
         )
 
-        params = SimpleParams(".hello   alice smith")
+    load = ns.get("_bundle_load")
-        result = plugin.on_send_message_hook(account=0, params=params)
+    check("bundle exposes its module loader", load is not None)
+    if load is not None:
+        header = load("header")
+        text = "✉️ From: Bob\n      ⤷ 💬 Message\n🗑 Deleted at x\n\nHi 😀 there"
+        end = header.utf16_len(text)
+        body, entities = header.strip(text, [(0, 4, "from"), (end - 5, 5, "bold")])
+        check("header stripped from logged copy", body == "Hi 😀 there", repr(body))
         check(
-            "'.hello   alice smith' renders greeting",
+            "entities shifted past the header (UTF-16)",
-            params.message == "Hello, Alice Smith!",
+            entities == [(6, 5, "bold")],
-            f"got {params.message!r}",
+            repr(entities),
         )
         check(
-            "on_send_message_hook returns MODIFY strategy",
+            "text without a header is kept",
-            result.strategy == HookStrategy.MODIFY,
+            header.strip("plain", [(0, 5, "x")]) == ("plain", [(0, 5, "x")]),
-            f"got {result.strategy}",
         )
 
-        plugin.set_setting("template", "{nope}")
+        peers = load("peers")
-        params2 = SimpleParams(".hello someone")
-        plugin.on_send_message_hook(account=0, params=params2)
         check(
-            "bad template produces 'Bad template:' message",
+            "marked channel id -> channel id",
-            params2.message.startswith("Bad template:"),
+            peers.channel_id_from_marked(-1000000001234) == 1234,
-            f"got {params2.message!r}",
+        )
+        chat = load("hooks.chat")
+        check(
+            "Telethon sender ids -> Android peer ids",
+            chat._android_peer_id(-1000000001234) == -1234 and chat._android_peer_id(42) == 42,
         )
 
-    # main.py imports `render`/`TemplateError` by name, so they live directly
+        links = load("hooks.links")
-    # in the executed namespace — call render() directly to inspect the raised
-    # traceback (proves linecache registration for bundled, non-file modules).
-    render = ns.get("render")
-    template_error = ns.get("TemplateError")
-    traceback_text = ""
-    if render is not None and template_error is not None:
-        try:
-            render("{nope}", "x")
-        except template_error:
-            traceback_text = traceback.format_exc()
         check(
-        "render() traceback names src/greeting/template.py",
+            "private message links parse (with and without topic)",
-        "src/greeting/template.py" in traceback_text,
+            links.parse("https://t.me/c/123/45") == (-123, 45)
-        f"traceback:\n{traceback_text}",
+            and links.parse("t.me/c/123/7/45") == (-123, 45)
+            and links.parse("tg://privatepost?channel=123&post=45") == (-123, 45),
+        )
+        check("non-message links are left alone", links.parse("https://t.me/c/123") is None)
+
+        plan, hour = chat._plan, 3600
+        check(
+            "sync plan: fresh when unchecked or older than an hour",
+            plan(None, 50, 2**31 - 1, 10_000) == (50, 2**31 - 1, True)
+            and plan((50, 2**31 - 1, 10_000 - hour), 50, 2**31 - 1, 10_000)
+            == (50, 2**31 - 1, True),
         )
         check(
-        "traceback includes the raising source line text",
+            "sync plan: nothing while the loaded range is checked",
-        "unsupported placeholder" in traceback_text,
+            plan((40, 2**31 - 1, 9_000), 50, 2**31 - 1, 10_000) is None,
-        f"traceback:\n{traceback_text}",
+        )
+        check(
+            "sync plan: only the older history loaded since",
+            plan((40, 2**31 - 1, 9_000), 10, 2**31 - 1, 10_000) == (10, 39, False)
+            and plan((40, 100, 9_000), 50, 120, 10_000) == (101, 120, False),
         )
 
-    check(
+        store = load("store")
-        "sys.modules gained no entry for bundled module names",
+        store.put_server_states(
-        not ({"greeting", "textutil", "main"} & new_modules),
+            0, -5, [{"message_id": i, "edit_count": 1} for i in range(1, 1201)]
-        f"leaked: {({'greeting', 'textutil', 'main'} & new_modules)}",
         )
+        (cached,) = store._conn().execute(
+            "SELECT count(*) FROM states WHERE account=0 AND dialog_id=-5"
+        ).fetchone()
+        check("cache has no per-chat cap", cached == 1200, f"{cached}")
+        check(
+            "a full check replaces the chat's cached marks",
+            store.replace_window(0, -5, 1, 10, [{"message_id": 5, "edit_count": 2}], False, full=True)
+            is not None
+            and store._conn().execute(
+                "SELECT count(*) FROM states WHERE account=0 AND dialog_id=-5"
+            ).fetchone()[0]
+            == 1,
+        )
+
+        store._conn().execute("UPDATE states SET at = at - 40 * 86400")
+        store._conn().commit()
+        store.put_server_states(0, -6, [{"message_id": 1, "edit_count": 1}])
+        removed = store.purge_old(30, force=True)
+        left = store._conn().execute("SELECT dialog_id FROM states").fetchall()
+        check(
+            "age purge drops answers older than the lifetime only",
+            removed == 1 and left == [(-6,)],
+            f"removed={removed} left={left}",
+        )
+        check("age purge runs once a day", store.purge_old(1) == 0)
+        for name in ("cached_deleted", "coverage", "set_coverage", "expire_coverage", "replace_window"):
+            check(f"store.{name} exists", callable(getattr(store, name, None)))
+
+        api = load("api")
+        client = api.Api(BasePlugin())
+        check("API unconfigured without URL and token", not client.configured)
+        client.plugin.set_setting("server_url", "https://panel.example/ ")
+        client.plugin.set_setting("api_token", "tlp_x, tlp_y\ntlp_z")
+        check("several tokens, any separator", client.tokens() == ["tlp_x", "tlp_y", "tlp_z"])
+        check(
+            "API base URL",
+            client._base() == "https://panel.example/api/v1/client/message-logger",
+            client._base(),
+        )
+
+    leaked = {"main", "header", "api", "store", "peers", "hooks", "views"} & new_modules
+    check("sys.modules gained no entry for bundled module names", not leaked, f"leaked: {leaked}")
 
     if _FAILURES:
         print(f"\n{len(_FAILURES)} check(s) failed: {', '.join(_FAILURES)}", file=sys.stderr)