Updated to v0.2.0

- Removed `_check_and_remove_html`. Using `_process_html_text` instead
- Added method for file uploading `_upload_file`
- Added method for raw bytes uploading `_upload_provider`
- Added method for thumbnail uploading `_upload_thumbnail`
- Added method that sends `content` JSON to the room using `m.room.message` type
- Fixed `self._debug_event_callback` not being called in `_callback_filter_router`
- Fixed type hints in `add_event_callback`
- Removed `kwargs` from `send_text_to_room`
- Added `send_image_to_room`
- Added `send_video_to_room`
- Added `auto_ffprobe` and `auto_ffmpeg` to `MatrixBotConfig`
- Added `VideoFileProperties` dataclass

.gitignore

@@ -1,4 +1,5 @@
 __pycache__/
+*.vscode
 .venv/
 dist/
 *.egg-info/

README.md

@@ -16,24 +16,26 @@ python -m pip install git+https://git.tyukalov.su/nikita/mab
 
 ## Basic usage
 
-This is the most simple bot you can create
+This is the most simple bot you can create. It would respond to any message
+that starts with `!test`, `!hello` or `!hi`.
 
 ```python
 import asyncio
 from mab import MatrixBot, MatrixBotConfig
+from mab import TextCommandFilter
+
 from nio import MatrixRoom, MatrixMessageText
 
 bot: MatrixBot
 
-async def on_room_message_text(room: MatrixRoom, event: RoomMessageText) -> None:
+async def on_valid_command(room: MatrixRoom, event: RoomMessageText) -> None:
     global bot
     # do not respond to ourselves
     if event.sender == bot.get_client().user_id:
         return
-    text = f"You message contains {len(event.body)} symbols"
+    text = f"Your message contains {len(event.body)} symbols"
     await bot.send_text_to_room(room.room_id, text)
 
-
 async def main() -> None:
     global bot
     # create and start the bot
@@ -43,6 +45,10 @@ async def main() -> None:
         storage_directory=Path("storage_nagibator666")
     )
     bot = MatrixBot(matrix_bot_config)
+    bot.add_event_callback(
+        on_valid_command,
+        TextCommandFilter(["test", "hello", "hi"])
+    )
     bot.start()
     # wait for Ctrl+C
     try:

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "mab"
-version = "0.0.1"
+version = "0.2.0"
 authors = [
     { name = "Tyukalov Nikita", email = "nikita@tyukalov.su" }
 ]
@@ -47,6 +47,8 @@ dependencies = [
     "unpaddedbase64==2.1.0",
     "vodozemac==0.10.0",
     "yarl==1.24.5",
+    "python-magic==0.4.27",
+    "pillow==12.3.0"
 ]
 
 [project.urls]

src/mab/__init__.py

@@ -5,6 +5,9 @@ from .types import MatrixBotConfig
 
 from .bot import MatrixBot
 
+from .filters.base import *
+from .filters.text import *
+
 __all__ = [
     # module names
     "bot",
@@ -14,5 +17,16 @@ __all__ = [
     "MatrixBotConfig",
 
     # .bot
-    "MatrixBot"
+    "MatrixBot",
+
+    # .filters.base
+    "BaseEventFilter",
+
+    # .filters.text
+    "TextFilter",
+    "FormattedTextFilter",
+    "TextContainsFilter",
+    "TextStartsWithFilter",
+    "TextEndsWithFilter",
+    "TextCommandFilter",
 ]

src/mab/bot.py

@@ -1,5 +1,5 @@
 import asyncio
-import aiofiles
+import aiofiles, aiofiles.os
 import aioconsole
 import traceback
 import logging
@@ -7,23 +7,31 @@ import time
 import json
 import os
 import re
+import io
+import magic
 from html.parser import HTMLParser
 from urllib.parse import urlparse
 from typing import Any, Callable, Awaitable
 
+from PIL import Image
+
 from nio import AsyncClient, AsyncClientConfig, SyncResponse
 from nio import LoginResponse, LoginError, WhoamiResponse, WhoamiError
 
 from nio import RoomSendResponse, RoomSendError
+from nio import UploadResponse, UploadError
 
 from nio import OlmUnverifiedDeviceError
 
 from nio import MatrixInvitedRoom, InviteMemberEvent
 from nio import JoinResponse
 
-import nio.events
+from .filters.base import BaseEventFilter
+
+from nio.events.room_events import Event as RoomEvemt
 
 from .types import *
+from .utils import Utils
 
 
 class MatrixBot:
@@ -106,30 +114,58 @@ class MatrixBot:
         return f"@{localpart}:{homeserver_name}"
 
     @staticmethod
-    def _check_and_remove_html(text_to_check: str) -> tuple[bool, str]:
-        """Checks if `text_to_check` is HTML and sanitizes it.
+    def _process_html_text(text: str, is_html: bool | None) -> dict:
+        """Processes `text` and `is_html` arguments of `send_*` functions and
+           prepares `content` keys related to text data inside the message.
+        
+            Args:
+                text - `text` as passed to the `send_*` function
+                is_html - `is_html` as passed to the `send_*` function
             
             Returns:
-        tuple[bool, str] where the first element is True if `text_to_check` contains
-        valid HTML, and the second element is text without HTML (or just copy of
-        `text_to_check` if it does not contain HTML)
+                `dict` that contains keys required for the text message to be
+                displayed correctly.
         """
+        # text w/ and w/o HTML
+        text_w_html: str | None = None
+        text_wo_html: str | None = None
+        # check if HTML is present
+        if is_html or is_html is None:
+            # will be True if `text` contains HTML tags
             has_tags = False
+            # text fragments without tags
             text_fragments = []
+            # temporary extractor class
             class Extractor(HTMLParser):
                 def handle_starttag(self, tag, attrs):
                     nonlocal has_tags
                     has_tags = True
                 def handle_data(self, data):
                     text_fragments.append(data)
+            # parse
             parser = Extractor(convert_charrefs=True)
-        parser.feed(text_to_check)
             try:
-            if has_tags:
-                return (True, " ".join("".join(text_fragments).split()))
+                parser.feed(text)
             except:
                 traceback.print_exc()
-        return (False, text_to_check)
+                text_wo_html = text
+            is_html = has_tags
+            if is_html:
+                text_wo_html = " ".join(text_fragments)
+                text_w_html = text
+        if not is_html:
+            text_wo_html = text
+        # return the content
+        if text_w_html:
+            return {
+                "body": text_wo_html,
+                "format": "org.matrix.custom.html",
+                "formatted_body": text_w_html
+            }
+        else:
+            return {
+                "body": text_wo_html
+            }
     
     @staticmethod
     async def _wait_for_task_and_stop_event(payload_task: asyncio.Task, stop_wait_task: asyncio.Task, print_exc: bool = False) -> Any:
@@ -178,6 +214,7 @@ class MatrixBot:
             traceback.print_exc()
 
 
+
     async def _write_next_batch(self, next_batch: str) -> None:
         """Writes `next_batch` value to disk."""
         path = self._config.storage_directory / "next_batch"
@@ -213,6 +250,154 @@ class MatrixBot:
             j = json.loads(await f.read())
         return j
 
+    async def _upload_file(self, path: Path | str, mime_type: str, *, filename: str | None = None) -> tuple[UploadResponse, dict, int]:
+        """Uploads the file with encryption enabled. UploadError will be raised
+           as RuntimeError.
+        
+            Args:
+                path - path to the file to upload
+                mime_type - mime-type to use
+                filename - filename to use (base name of the `path` will be used if not set)
+            
+            Returns:
+                1. UploadResponse as returned by `_upload_binary_data(...)`
+                2. dict as returned by `_upload_binary_data(...)`
+                3. file size in bytes
+        """
+        # get basic file info
+        file_info = await aiofiles.os.stat(path)
+        if not filename:
+            filename = os.path.basename(path)
+        # upload
+        async with aiofiles.open(path, "r+b") as f:
+            response, keys = await self._upload_provider(
+                f,
+                mime_type,
+                filename=filename,
+                filesize=file_info.st_size
+            )
+            return response, keys, file_info.st_size
+
+    async def _upload_provider(self, provider: Any, mime_type: str, *, filename: str, filesize: int) -> tuple[UploadResponse, dict]:
+        """Uploads the file with encryption enabled. UploadError will be raised
+           as RuntimeError.
+        
+            Args:
+                provider - data provider as described in `AsyncClient.upload(...)` docs
+                mime_type - mime-type to use
+                filename - filename to use
+            
+            Returns:
+                1. UploadResponse as returned by `AsyncClient.upload(...)`
+                2. dict as returned by `AsyncClient.upload(...)`
+        """
+        # upload
+        response, keys = await self._client.upload(
+            provider,
+            content_type=mime_type,
+            filename=filename,
+            encrypt=True,
+            monitor=None,
+            filesize=filesize
+        )
+        if isinstance(response, UploadError):
+            raise RuntimeError(response.message, response)
+        if not isinstance(response, UploadResponse):
+            raise RuntimeError(
+                "Upload result must be `UploadRespond`, but it's not",
+                response
+            )
+        return response, keys # type: ignore
+
+    async def _upload_thumbnail(self, thumbnail: Path | str | bytes | None) -> dict:
+        """Upload thumbnail and return fields required to use it for video.
+        
+            Args:
+                thumbnail - path to the thumbnail file or raw `bytes` of the image.
+                            You can actually pass `None`, empty dict will be returned
+                            in this case.  
+            
+            Returns:
+                `dict` you should embed into your `content["info"]`
+        """
+        if thumbnail is None:
+            return {}
+        # raw data
+        raw_bytes_io: io.BytesIO | None = None
+        if type(thumbnail) is bytes:
+            thumb_mime = magic.from_buffer(thumbnail, mime=True)
+            raw_bytes_io = io.BytesIO(thumbnail)
+        # file path
+        else:
+            thumb_mime = magic.from_file(thumbnail, mime=True)
+        # check if invalid MIME
+        if not thumb_mime.startswith("image/"):
+            raise RuntimeError(f"Thumbnail MIME is not image: `{thumb_mime}`")
+        # get thumbnail size
+        with Image.open(raw_bytes_io or thumbnail) as f:
+            width, height = f.size
+        # seek BytesIO to zero so we can reuse it
+        if raw_bytes_io is not None:
+            raw_bytes_io.seek(0)
+        # upload
+        if type(thumbnail) is bytes:
+            thumb_size = len(thumbnail)
+            thumb_resp, thumb_keys = await self._upload_provider(
+                raw_bytes_io,
+                thumb_mime,
+                filename=f"preview.{thumb_mime.split("/")[-1]}",
+                filesize=thumb_size
+            )
+        else:
+            thumb_resp, thumb_keys, thumb_size = await self._upload_file(
+                thumbnail, # type: ignore
+                mime_type=thumb_mime,
+                filename=os.path.basename(str(thumbnail))
+            )
+        # return the result
+        return {
+            "thumbnail_file": {
+                "url": thumb_resp.content_uri,
+                "mimetype": thumb_mime,
+                **thumb_keys
+            },
+            "thumbnail_info": {
+                "w": width,
+                "h": height,
+                "size": thumb_size,
+                "mimetype": thumb_mime
+            }
+        }
+
+    async def _send_content_to_room(self, room_id: str, content: dict) -> RoomSendResponse:
+        """Sends `m.room.message` event to the room. Returns RoomSendResponse
+           as returned by `AsyncClient.room_send(...)`. Automatically verifies
+           all devices if this feature is enabled. Return values other than
+           `RoomSendResponse` are raised as `RuntimeError`."""
+        # try to send the message
+        try:
+            result = await self._client.room_send(
+                room_id=room_id,
+                message_type="m.room.message",
+                content=content
+            )
+        except OlmUnverifiedDeviceError:
+            if self._config.auto_verify_all_known_devices:
+                if not self.verify_all_known_devices():
+                    raise
+                return await self._send_content_to_room(room_id, content)
+            else:
+                raise
+        # success
+        if type(result) is RoomSendResponse:
+            return result
+        # error
+        elif type(result) is RoomSendError:
+            raise RuntimeError(result)
+        # unknown error
+        else:
+            raise RuntimeError("Unknown error has occured", result)
+
     #
     # CALLBACKS
     #
@@ -244,13 +429,34 @@ class MatrixBot:
         except:
             self._logger.error(traceback.format_exc())
 
+    async def _callback_filter_router(self, *args, **kwargs):
+        if len(args) != 2:
+            self._logger.debug("Can't process the event, not enough positional args")
+            await self._debug_event_callback(*args, **kwargs)
+            return
+        room = args[0]
+        event = args[1]
+        for filter in self._filters:
+            filter_object = filter[0]
+            filter_callback = filter[1]
+            filter_stop_after_this = filter[2]
+            if filter_object(room, event):
+                self._logger.debug(f"Filter {repr(filter_object)} matched")
+                try:
+                    await filter_callback(room, event)
+                except:
+                    self._logger.error(traceback.format_exc())
+                if filter_stop_after_this:
+                    self._logger.debug(f"Filter {repr(filter_object)} stops matching")
+                    break
+
     #
     # LIFECYCLE
     #
     def _setup_client_callbacks(self) -> None:
         """Setup internal client callbacks"""
         self._client.add_response_callback(self._callback_sync, SyncResponse) # type: ignore
-
+        self._client.add_event_callback(self._callback_filter_router, RoomEvemt) # type: ignore
         if self._config.auto_join_any_room_on_invite:
             self._client.add_event_callback(self._callback_autojoin, InviteMemberEvent) # type: ignore
 
@@ -263,6 +469,7 @@ class MatrixBot:
             user_id=username,
             **session_data
         )
+        self._client.load_store()
         result = await self._client.whoami()
         if type(result) is WhoamiError:
             self._logger.error(f"Can't log in using stored session data: '{result.message}'")
@@ -369,7 +576,8 @@ class MatrixBot:
         sync_task = asyncio.create_task(
             self._client_cancellable_sync_forever(
                 timeout=self.MATRIX_SYNC_PERIOD,
-                since=(await self._read_next_batch())
+                since=(await self._read_next_batch()),
+                full_state=True
             )
         )
         try:
@@ -387,6 +595,8 @@ class MatrixBot:
     #
     def __init__(self, config: MatrixBotConfig) -> None:
         # check if config is valid
+        if type(config.storage_directory) is str:
+            config.storage_directory = Path(config.storage_directory)
         self._validate_bot_config(config) # may raise an Exception
         # save the config
         self._config: MatrixBotConfig = config
@@ -402,6 +612,7 @@ class MatrixBot:
         self._last_next_batch_dump: float = 0.0
         self._last_next_batch: str | None = None
         self._cb_password = self._default_password_callback
+        self._filters = []
 
     def start(self) -> None:
         """Start the bot.
@@ -449,18 +660,17 @@ class MatrixBot:
                 result = True
         return result
 
-    def add_event_callback(self, callback: Callable[[Any], Awaitable[None]] | None, event_class: nio.events.Event) -> None:
-        """Added event callback for events of specified class.
-            Use `None` instead of callback to print parameter types you need to use in your callback."""
+    def add_event_callback(self, callback: Callable[..., Awaitable[None]] | None, filter: BaseEventFilter, stop_after_this: bool = True) -> None:
+        """Add event callback for events that pass the filter."""
         if callback is None:
             callback = self._debug_event_callback
-        self._client.add_event_callback(callback, event_class) # type: ignore
+        self._filters.append((filter, callback, stop_after_this))
 
     def get_client(self) -> AsyncClient:
         """Get AsyncClient in use"""
         return self._client
 
-    async def send_text_to_room(self, room_id: str, text: str, is_html: bool | None = None, **kwargs) -> str:
+    async def send_text_to_room(self, room_id: str, text: str, is_html: bool | None = None) -> str:
         """Sends a text message to the room and handle HTML as specified.
         
         Args:
@@ -471,42 +681,147 @@ class MatrixBot:
         Returns:
             event_id of the message on success. Raises an exception on error.
         """
-        original_text = text
-        # guess if text is HTML
-        if is_html is None:
-            is_html, text = self._check_and_remove_html(text)
-        # text is HTML
-        elif is_html:
-            _, text = self._check_and_remove_html(text)
-        # create `content` for `room_send()`
+        text_data = self._process_html_text(text, is_html)
         content = {
             "msgtype": "m.text",
-            "body": text,
-            **kwargs
+            **text_data
         }
-        if is_html:
-            content["format"] = "org.matrix.custom.html"
-            content["formatted_body"] = original_text
-        # try to send the message
-        try:
-            result = await self._client.room_send(
-                room_id=room_id,
-                message_type="m.room.message",
-                content=content
+        return (await self._send_content_to_room(room_id, content)).event_id
+
+    async def send_image_to_room(self,
+                                room_id: str,
+                                path: Path | str,
+                                caption: str | None = None,
+                                is_html: bool | None = None) -> str:
+        """Send an image to the room.
+        
+            This method sends specified image file to the specified room. It
+            will use mime-type deduced using `magic` module. Image dimension is
+            deduced using Pillow. The file is read asynchronously, so this
+            method won't block your event loop.
+
+            Please note that HTML is incorrectly interpreted for images in
+            some clients (as of September 6th, 2026).
+
+            Args:
+                room_id - room_id to send the image to
+                path - path to the image file
+                caption - caption to use (will be hidden if it is the same as file basename)
+                is_html - whether the caption is HTML (autodetected if None)
+            
+            Returns:
+                event_id
+        """
+        # caption must not actually be empty
+        if caption is None or not caption.strip():
+            caption = os.path.basename(path)
+            is_html = False
+        # check if the file is image
+        mime_type: str = magic.from_file(path, mime=True)
+        if not mime_type.startswith("image/"):
+            raise RuntimeError(f"File {path} has non-image mime-type")
+        # get image size
+        with Image.open(path) as image:
+            width, height = image.size
+        # upload
+        response, keys, filesize = await self._upload_file(path, mime_type)
+        # prepare the content
+        content = {
+            "msgtype": "m.image",
+            "filename": os.path.basename(path),
+            **self._process_html_text(caption, is_html),
+            "file": {
+                "url": response.content_uri,
+                "mimetype": mime_type,
+                **keys
+            },
+            "info": {
+                "mimetype": mime_type,
+                "size": filesize,
+                "w": width,
+                "h": height
+            }
+        }
+        # send
+        return (await self._send_content_to_room(room_id, content)).event_id
+
+    async def send_video_to_room(self,
+                                room_id: str,
+                                path: Path | str,
+                                props: VideoFileProperties | None = None,
+                                caption: str | None = None,
+                                is_html: bool | None = None) -> str:
+        """Send a video to the room.
+        
+            This method sends specified video file to the specified room. It
+            will use mime-type deduced using `magic` module. Most video
+            properties must be passed using `props` argument.
+            
+            If you pass `None` as `props` then system `ffprobe` will be called
+            to get video dimensions and duration. You can disable this behavior
+            by disabling `auto_ffprobe` in `MatrixBotConfig`.
+
+            If you pass `None` as `props.thumbnail_path` then thumbnail will be
+            generated automatically. You can disable this behavior by disabling
+            `auto_ffmpeg` in `MatrixBotConfig`.
+
+            Please note that HTML is incorrectly interpreted for videos in
+            some clients (as of September 6th, 2026).
+
+            Args:
+                room_id - room_id to send the video to
+                path - path to the video file
+                props - video properties
+                caption - caption to use (will be hidden if it is the same as file basename)
+                is_html - whether the caption is HTML (autodetected if None)
+            
+            Returns:
+                event_id
+        """
+        # caption must not actually be empty
+        if caption is None or not caption.strip():
+            caption = os.path.basename(path)
+            is_html = False
+        # check if the file is video
+        mime_type: str = magic.from_file(path, mime=True)
+        if not mime_type.startswith("video/"):
+            raise RuntimeError(f"File {path} has non-video mime-type")
+        # properties must not be empty
+        if props is None:
+            if not self._config.auto_ffprobe:
+                raise RuntimeError("No `props` are supplied and `auto_ffprobe` is disabled")
+            props = await Utils.get_video_props_using_ffprobe(path)
+        # thumbnail data to use
+        thumbnail_data = {}
+        # autogenerate thumbnail if allowed
+        if not props.thumbnail and self._config.auto_ffmpeg:
+            props.thumbnail = await Utils.get_video_thumbnail(
+                path,
+                timestamp=props.duration_ms / 1000 / 2,
+                max_size=400
             )
-        except OlmUnverifiedDeviceError:
-            if self._config.auto_verify_all_known_devices:
-                if not self.verify_all_known_devices():
-                    raise
-                return await self.send_text_to_room(room_id, original_text, is_html, **kwargs)
-            else:
-                raise
-        # success
-        if type(result) is RoomSendResponse:
-            return result.event_id
-        # error
-        elif type(result) is RoomSendError:
-            raise RuntimeError(result)
-        # unknown error
-        else:
-            raise RuntimeError("Unknown error has occured", result)
+        # upload the thumbnail if specified
+        thumbnail_data = await self._upload_thumbnail(props.thumbnail)
+        # upload
+        response, keys, filesize = await self._upload_file(path, mime_type)
+        # prepare the content
+        content = {
+            "msgtype": "m.video",
+            "filename": os.path.basename(path),
+            **self._process_html_text(caption, is_html),
+            "file": {
+                "url": response.content_uri,
+                "mimetype": mime_type,
+                **keys
+            },
+            "info": {
+                "duration": props.duration_ms,
+                "mimetype": mime_type,
+                "size": filesize,
+                "w": props.width_px,
+                "h": props.height_px,
+                **thumbnail_data
+            }
+        }
+        # send
+        return (await self._send_content_to_room(room_id, content)).event_id

src/mab/filters/base.py

@@ -0,0 +1,139 @@
+from abc import ABC, abstractmethod
+import logging
+
+from nio import MatrixRoom, Event
+
+class BaseEventFilter(ABC):
+    """Base class for all message filters"""
+    _logger = logging.Logger("EventFilter")
+
+    # AND
+    def __and__(self, other):
+        if not isinstance(other, BaseEventFilter):
+            raise TypeError(f"BaseEventFilter can't be ANDed against {type(other)}")
+        return CompoundEventFilter(
+            CompoundEventFilter.OPERATOR_AND,
+            [self, other]
+        )
+
+    def __rand__(self, other):
+        return self.__and__(other)
+
+    # OR
+    def __or__(self, other):
+        if not isinstance(other, BaseEventFilter):
+            raise TypeError(f"BaseEventFilter can't be ORed against {type(other)}")
+        return CompoundEventFilter(
+            CompoundEventFilter.OPERATOR_OR,
+            [self, other]
+        )
+
+    def __ror__(self, other):
+        return self.__ror__(other)
+
+    # XOR
+    def __xor__(self, other):
+        if not isinstance(other, BaseEventFilter):
+            raise TypeError(f"BaseEventFilter can't be XORed against {type(other)}")
+        return CompoundEventFilter(
+            CompoundEventFilter.OPERATOR_XOR,
+            [self, other]
+        )
+
+    def __rxor__(self, other):
+        return self.__xor__(other)
+
+    # INVERT
+    def __invert__(self):
+        return CompoundEventFilter(
+            CompoundEventFilter.OPERATOR_INVERT,
+            [self]
+        )
+
+    # PAYLOAD
+    @abstractmethod
+    def __repr__(self) -> str:
+        """This method must be redefined in derived classes to improve
+           debugging experience.
+        """
+        pass
+
+    @abstractmethod
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        """This abstract method must be redefined in derived classes so that
+           the filter operates according to its description. This method must
+           not raise exceptions. In case of exception it should log it using
+           `self._logger` and return False
+           
+            Args:
+                event - the event to check againts this filter
+            
+            Returns:
+                True if the event satisfies this filter
+                False if the event does not satisfy this filter
+        """
+        pass
+
+class CompoundEventFilter(BaseEventFilter):
+    """Event filter that consists of multiple filters"""
+    OPERATOR_AND = "and"
+    OPERATOR_OR = "or"
+    OPERATOR_XOR = "xor"
+    OPERATOR_INVERT = "invert"
+
+    @staticmethod
+    def _is_operator_valid(op: str) -> bool:
+        """Returns True if operator `op` is a valid operator"""
+        return op in [
+            CompoundEventFilter.OPERATOR_AND,
+            CompoundEventFilter.OPERATOR_OR,
+            CompoundEventFilter.OPERATOR_XOR,
+            CompoundEventFilter.OPERATOR_INVERT
+        ]
+
+    @staticmethod
+    def _is_elements_count_valid(op: str, count: int) -> bool:
+        """Returns True if operator `op` may take `count` arguments"""
+        return count in {
+            CompoundEventFilter.OPERATOR_AND: [2],
+            CompoundEventFilter.OPERATOR_OR: [2],
+            CompoundEventFilter.OPERATOR_XOR: [2],
+            CompoundEventFilter.OPERATOR_INVERT: [1],
+        }[op]
+
+    def __init__(self, operator: str, arguments: list[BaseEventFilter]):
+        super().__init__()
+        if not self._is_operator_valid(operator):
+            raise RuntimeError(f"Invalid operator `{operator}`")
+        if not self._is_elements_count_valid(operator, len(arguments)):
+            raise RuntimeError(f"Operator `{operator}` does not take `{len(arguments)}` arguments")
+        self._operator = operator
+        self._arguments = list(arguments)
+
+    def __repr__(self) -> str:
+        expression = "False"
+        reprs = [repr(a) for a in self._arguments]
+        if self._operator == CompoundEventFilter.OPERATOR_AND:
+            expression = " & ".join(reprs)
+        elif self._operator == CompoundEventFilter.OPERATOR_OR:
+            expression = " | ".join(reprs)
+        elif self._operator == CompoundEventFilter.OPERATOR_XOR:
+            expression = " ^ ".join(reprs)
+        elif self._operator == CompoundEventFilter.OPERATOR_INVERT:
+            expression = f"~{reprs[0]}"
+        return f"({expression})"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        evaluated = [arg(room, event) for arg in self._arguments]
+        if self._operator == self.OPERATOR_AND:
+            return all(evaluated)
+        elif self._operator == self.OPERATOR_OR:
+            return any(evaluated)
+        elif self._operator == self.OPERATOR_XOR:
+            result = evaluated[0]
+            for v in evaluated[1:]:
+                result ^= v
+            return result
+        elif self._operator == self.OPERATOR_INVERT:
+            return not evaluated[0]
+        return False

src/mab/filters/text.py

@@ -0,0 +1,164 @@
+from .base import BaseEventFilter
+
+from nio import MatrixRoom, Event
+
+class TextFilter(BaseEventFilter):
+    """
+        This filter returns True if the event contains `body` attribute.
+        `body` attribute contains unformatted text, string.
+    """
+    def __init__(self):
+        super().__init__()
+
+    def __repr__(self):
+        return "TextFilter()"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        return hasattr(event, "body") and type(event.body) is str # type: ignore
+
+class FormattedTextFilter(BaseEventFilter):
+    """
+        This filter returns True if the event contains valid `formatted_body`
+        attribute. `formatted_body` attribute contains formatted text, string.
+    """
+    def __init__(self):
+        super().__init__()
+
+    def __repr__(self):
+        return "FormattedTextFilter()"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        return hasattr(event, "formatted_body") and type(event.formatted_body) is str # type: ignore
+
+class TextContainsFilter(BaseEventFilter):
+    """
+        This filter returns True if the `event.body` contains `needle`
+        substring (or any of neddle from the list). The check will be case
+        insensetive if `any_case` is True.
+    """
+    def __init__(self, needle: str | list[str], *, any_case: bool = True):
+        super().__init__()
+        if type(needle) is str:
+            needle = [needle]
+        self._any_case = any_case
+        if self._any_case:
+            self._needle = [s.lower() for s in needle]
+        else:
+            self._needle = list(needle)
+
+    def __repr__(self):
+        return f"TextContainsFilter({repr(self._needle)}, any_case={repr(self._any_case)})"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        try:
+            body = event.body.lower() if self._any_case else event.body # type: ignore
+            for n in self._needle:
+                if n in body:
+                    return True
+            return False
+        except:
+            return False
+
+class TextStartsWithFilter(BaseEventFilter):
+    """
+        This filter returns True if the `event.body` starts with `substring` (or
+        any of substrings from the list). The check will be case insensetive if
+        `any_case` is True.
+    """
+    def __init__(self, substring: str | list[str], *, any_case: bool = True):
+        super().__init__()
+        if type(substring) is str:
+            substring = [substring]
+        self._any_case = any_case
+        if self._any_case:
+            self._substring = [s.lower() for s in substring]
+        else:
+            self._substring = list(substring)
+
+    def __repr__(self):
+        return f"TextStartsWithFilter({repr(self._substring)}, any_case={repr(self._any_case)})"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        try:
+            body = event.body.lower() if self._any_case else event.body # type: ignore
+            for s in self._substring:
+                if body.startswith(s):
+                    return True
+            return False
+        except:
+            return False
+        
+class TextEndsWithFilter(BaseEventFilter):
+    """
+        This filter returns True if the `event.body` ends with `substring` (or
+        any of substrings from the list). The check will be case insensetive if
+        `any_case` is True.
+    """
+    def __init__(self, substring: str | list[str], *, any_case: bool = True):
+        super().__init__()
+        if type(substring) is str:
+            substring = [substring]
+        self._any_case = any_case
+        if self._any_case:
+            self._substring = [s.lower() for s in substring]
+        else:
+            self._substring = list(substring)
+
+    def __repr__(self):
+        return f"TextEndsWithFilter({repr(self._substring)}, any_case={repr(self._any_case)})"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        try:
+            body = event.body.lower() if self._any_case else event.body # type: ignore
+            for s in self._substring:
+                if body.endswith(s):
+                    return True
+            return False
+        except:
+            return False
+
+class TextCommandFilter(BaseEventFilter):
+    """
+        This filter returns True if all conditions are True:
+        1. `event.body` contains at least `min_args + 1` words after split()
+        2. `event.body` conrains at most `max_args + 1` words after split()
+        3. First element of splitted `event.body` starts with `prefix`
+        4. First element of splitted `event.body` (after stripping `prefix`)
+           starts with any of strings in `verbs` list (case-insensitive)
+        
+        Remarks:
+        - If this filter is satified, then it will set a new attribute for the
+          event: `event.command_args: list[str]`. You may use this attribute in
+          your callback for this event.
+    """
+    def __init__(self, verbs: str | list[str], min_args: int = 0, max_args: int | None = None, prefix: str = "!"):
+        super().__init__()
+        if type(verbs) is str:
+            verbs = [verbs]
+        verbs = [v.lower() for v in verbs]
+        self._verbs = verbs
+        self._min_args = min_args
+        self._max_args = max_args
+        self._prefix = prefix
+
+    def __repr__(self):
+        return f"TextCommandFilter({repr(self._verbs)}, {repr(self._min_args)}, {repr(self._max_args)}, {repr(self._prefix)})"
+
+    def __call__(self, room: MatrixRoom, event: Event) -> bool:
+        try:
+            parts = [p.strip() for p in event.body.split() if p.strip()] # type: ignore
+            args_count = len(parts) - 1
+            if args_count < self._min_args:
+                return False
+            if self._max_args is not None and args_count > self._max_args:
+                return False
+            if not parts[0].startswith(self._prefix):
+                return False
+            cmd = parts[0][len(self._prefix):].lower()
+            for verb in self._verbs:
+                if cmd == verb:
+                    setattr(event, "command_args", parts[1:])
+                    return True
+            return False
+        except:
+            return False

src/mab/types.py

@@ -21,3 +21,25 @@ class MatrixBotConfig:
 
     auto_join_any_room_on_invite: bool = True
     """Enable automatic join for invites (implemented by automatically adding internal callback on bot creation)"""
+
+    auto_ffprobe: bool = True
+    """Enable automatic `ffprobe` execution to get some media properties"""
+
+    auto_ffmpeg: bool = True
+    """Enabled automatic `ffmpeg` execution to generate some media (e.g. thumbnails)"""
+
+@dataclass
+class VideoFileProperties:
+    """Properties of the video for sending"""
+
+    width_px: int
+    """Width in pixels"""
+
+    height_px: int
+    """Height in pixels"""
+
+    duration_ms: int
+    """Duration in milliseconds"""
+
+    thumbnail: Path | str | bytes | None = None
+    """Path to the thumbnail or the raw JPEG thumbnail data"""

src/mab/utils.py

@@ -0,0 +1,98 @@
+"""Utility things"""
+
+import asyncio
+import json
+from pathlib import Path
+
+from .types import *
+
+class Utils:
+    @staticmethod
+    async def get_video_props_using_ffprobe(path: Path | str) -> VideoFileProperties:
+        """Returns video properties for file at `path`.
+
+        Consider using `asyncio.timeout` to prevent deadlocking.
+        """
+        # prepare arguments for ffprobe
+        args = [
+            "ffprobe",
+            "-v", "error",
+            "-select_streams", "v:0",
+            "-show_entries", "stream=width,height:format=duration",
+            "-of", "json",
+            str(path)
+        ]
+        # start the process
+        proc = await asyncio.create_subprocess_exec(
+            *args,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        # communicate `stdout` and `stderr`
+        try:
+            stdout, stderr = await proc.communicate()
+        except asyncio.CancelledError:
+            if proc.returncode is None:
+                proc.kill()
+            await proc.wait()
+            raise
+        # error
+        if proc.returncode != 0:
+            raise RuntimeError(f"`ffprobe` exits with code {proc.returncode}: {stderr.decode(errors="replace")}")
+        # success
+        result = json.loads(stdout)
+        return VideoFileProperties(
+            width_px=int(result["streams"][0]["width"]),
+            height_px=int(result["streams"][0]["height"]),
+            duration_ms=int(float(result["format"]["duration"]) * 1000)
+        )
+
+    @staticmethod
+    async def get_video_thumbnail(path: Path | str, *, timestamp: float = 0, max_size: int = 300) -> bytes:
+        """Generates video thumbnail for file at `path`.
+
+            Args:
+                - path - path to the video
+                - timestamp - timestamp to use as the thumbnail
+                - max_size - max width/height
+            
+            Returns:
+                Raw bytes of JPEG thumbnail
+        """
+        # prepare arguments for ffmpeg
+        args = [
+            "ffmpeg",
+            "-v", "error",
+            "-ss", "%.2f" % timestamp,
+            "-i", str(path),
+            "-map", "0:v:0",
+            "-vf",
+            (
+                f"scale='min(iw,{max_size})':'min(ih,{max_size})':"
+                "force_original_aspect_ratio=decrease"
+            ),
+            "-frames:v", "1",
+            "-q:v", "3",
+            "-f", "image2pipe",
+            "-vcodec", "mjpeg",
+            "pipe:1"
+        ]
+        # start the process
+        proc = await asyncio.create_subprocess_exec(
+            *args,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        # communicate `stdout` and `stderr`
+        try:
+            stdout, stderr = await proc.communicate()
+        except asyncio.CancelledError:
+            if proc.returncode is None:
+                proc.kill()
+            await proc.wait()
+            raise
+        # error
+        if proc.returncode != 0 or not stdout:
+            raise RuntimeError(f"`ffmpeg` exits with code {proc.returncode}: {stderr.decode(errors="replace")}", args)
+        # success
+        return stdout