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import re
from aiogram import Bot
from aiogram.exceptions import TelegramBadRequest
from aiogram.types import (
FSInputFile,
InlineKeyboardButton,
InlineKeyboardMarkup,
)
from helpers.errors import format_error
from helpers.print_style import PrintStyle
_UNSET = object() # sentinel: "not provided" (lets Bot default apply)
# Text messages
MAX_MESSAGE_LENGTH: int = 4096 # Telegram message length limit
async def send_text(
bot: Bot,
chat_id: int,
text: str,
reply_to_message_id: int | None = None,
parse_mode: object = _UNSET,
) -> int | None:
"""Send text message, splitting if too long. Returns last message_id or None on error.
parse_mode behaviour:
- _UNSET (default): omitted from send_message → Bot's DefaultBotProperties applies.
- None: explicitly no formatting.
- "HTML"/"Markdown"/etc.: that specific mode.
"""
try:
chunks = _split_text(text, MAX_MESSAGE_LENGTH)
last_msg_id = None
pm_kwargs: dict = {} if parse_mode is _UNSET else {"parse_mode": parse_mode}
for chunk in chunks:
try:
msg = await bot.send_message(
chat_id=chat_id,
text=chunk,
reply_to_message_id=reply_to_message_id,
**pm_kwargs,
)
last_msg_id = msg.message_id
except TelegramBadRequest:
# Retry as plain text, stripping HTML tags
plain = re.sub(r"<[^>]+>", "", chunk)
msg = await bot.send_message(
chat_id=chat_id,
text=plain,
reply_to_message_id=reply_to_message_id,
parse_mode=None,
)
last_msg_id = msg.message_id
return last_msg_id
except Exception as e:
PrintStyle.error(f"Telegram send_text failed: {format_error(e)}")
return None
# Files and images
async def send_file(
bot: Bot,
chat_id: int,
file_path: str,
caption: str = "",
reply_to_message_id: int | None = None,
) -> int | None:
"""Send a file from local path. Returns message_id or None on error."""
try:
if not os.path.isfile(file_path):
PrintStyle.error(f"Telegram: file not found: {file_path}")
return None
input_file = FSInputFile(file_path)
msg = await bot.send_document(
chat_id=chat_id,
document=input_file,
caption=caption[:1024] if caption else None,
reply_to_message_id=reply_to_message_id,
)
return msg.message_id
except Exception as e:
PrintStyle.error(f"Telegram send_file failed: {format_error(e)}")
return None
async def send_photo(
bot: Bot,
chat_id: int,
photo_path: str,
caption: str = "",
reply_to_message_id: int | None = None,
) -> int | None:
"""Send a photo from local path. Returns message_id or None on error."""
try:
if not os.path.isfile(photo_path):
PrintStyle.error(f"Telegram: photo not found: {photo_path}")
return None
input_file = FSInputFile(photo_path)
msg = await bot.send_photo(
chat_id=chat_id,
photo=input_file,
caption=caption[:1024] if caption else None,
reply_to_message_id=reply_to_message_id,
)
return msg.message_id
except Exception as e:
PrintStyle.error(f"Telegram send_photo failed: {format_error(e)}")
return None
# Inline keyboards
def build_inline_keyboard(
buttons: list[list[dict]],
) -> InlineKeyboardMarkup:
"""Build inline keyboard from a list of rows.
Each row is a list of dicts with keys: text, callback_data or url.
"""
rows = []
for row in buttons:
row_buttons = []
for btn in row:
if "url" in btn:
row_buttons.append(InlineKeyboardButton(
text=btn["text"], url=btn["url"],
))
else:
row_buttons.append(InlineKeyboardButton(
text=btn["text"],
callback_data=btn.get("callback_data", btn["text"]),
))
rows.append(row_buttons)
return InlineKeyboardMarkup(inline_keyboard=rows)
async def send_text_with_keyboard(
bot: Bot,
chat_id: int,
text: str,
buttons: list[list[dict]],
reply_to_message_id: int | None = None,
parse_mode: object = _UNSET,
) -> int | None:
"""Send text with inline keyboard buttons."""
try:
keyboard = build_inline_keyboard(buttons)
pm_kwargs: dict = {} if parse_mode is _UNSET else {"parse_mode": parse_mode}
msg = await bot.send_message(
chat_id=chat_id,
text=text,
reply_markup=keyboard,
reply_to_message_id=reply_to_message_id,
**pm_kwargs,
)
return msg.message_id
except Exception as e:
PrintStyle.error(f"Telegram send_text_with_keyboard failed: {format_error(e)}")
return None
# Typing indicator
async def send_typing(bot: Bot, chat_id: int):
"""Send 'typing...' action to chat."""
try:
await bot.send_chat_action(chat_id=chat_id, action="typing")
except Exception:
pass
# File download
async def download_file(
bot: Bot,
file_id: str,
destination: str,
) -> str | None:
"""Download a file by file_id to destination path. Returns path or None on error."""
try:
file = await bot.get_file(file_id)
if not file.file_path:
return None
os.makedirs(os.path.dirname(destination), exist_ok=True)
await bot.download_file(file.file_path, destination)
return destination
except Exception as e:
PrintStyle.error(f"Telegram download failed: {format_error(e)}")
return None
# Helpers
def _split_text(text: str, max_len: int) -> list[str]:
if len(text) <= max_len:
return [text]
chunks = []
while text:
if len(text) <= max_len:
chunks.append(text)
break
# Try to split at newline
split_at = text.rfind("\n", 0, max_len)
if split_at == -1 or split_at < max_len // 2:
split_at = max_len
chunks.append(text[:split_at])
text = text[split_at:].lstrip("\n")
return chunks
_IMAGE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp"}
def is_image_file(path: str) -> bool:
_, ext = os.path.splitext(path.lower())
return ext in _IMAGE_EXTENSIONS
def md_to_telegram_html(text: str) -> str:
"""Convert Markdown to Telegram-compatible HTML."""
stash: list[str] = []
def _put(html: str) -> str:
stash.append(html)
return f"\x00B{len(stash) - 1}\x00"
def _esc(t: str) -> str:
return t.replace("&", "&").replace("<", "<").replace(">", ">")
# Stash code blocks & inline code
def _code_block(m):
lang, body = m.group(1), m.group(2).rstrip("\n")
if lang:
return _put(f'<pre><code class="language-{lang}">{_esc(body)}</code></pre>')
return _put(f"<pre>{_esc(body)}</pre>")
text = re.sub(r"(?:```|~~~)(\w*)\n?(.*?)(?:```|~~~)", _code_block, text, flags=re.DOTALL)
text = re.sub(r"`([^`]+)`", lambda m: _put(f"<code>{_esc(m.group(1))}</code>"), text)
# Strip unsupported syntax
text = _strip_tables(text)
text = re.sub(r"^[ \t]*[-*_=]{3,}[ \t]*$", "", text, flags=re.MULTILINE)
text = re.sub(r"!\[([^\]]*)\]\(([^)]+)\)", r"[\1](\2)", text)
# Stash links
text = re.sub(
r"\[([^\]]+)\]\(([^)]+)\)",
lambda m: _put(
f'<a href="{m.group(2).replace("&", "&").replace(chr(34), """)}">{_esc(m.group(1))}</a>'
),
text,
)
# Escape HTML & apply inline formatting
text = _esc(text)
text = re.sub(r"\*\*\*(.+?)\*\*\*", r"<b><i>\1</i></b>", text)
text = re.sub(r"\*\*(.+?)\*\*", r"<b>\1</b>", text)
text = re.sub(r"__(.+?)__", r"<b>\1</b>", text)
text = re.sub(r"(?<!\w)\*([^*]+?)\*(?!\w)", r"<i>\1</i>", text)
text = re.sub(r"(?<!\w)_([^_]+?)_(?!\w)", r"<i>\1</i>", text)
text = re.sub(r"~~(.+?)~~", r"<s>\1</s>", text)
text = re.sub(r"^#{1,6}\s+(.+)$", r"<b>\1</b>", text, flags=re.MULTILINE)
# Block-level formatting
text = _convert_blockquotes(text)
text = _convert_lists(text)
# Restore stash
for i, block in enumerate(stash):
text = text.replace(f"\x00B{i}\x00", block)
return text
_TABLE_RE = re.compile(r"^\|(.+)\|$")
_TABLE_SEP = re.compile(r"^[\s|:-]+$")
def _strip_tables(text: str) -> str:
"""Strip Markdown table pipe syntax, keeping cell content as plain text."""
out: list[str] = []
for line in text.split("\n"):
stripped = line.strip()
if _TABLE_SEP.match(stripped):
continue
m = _TABLE_RE.match(stripped)
if m:
out.append(" ".join(c.strip() for c in m.group(1).split("|")))
else:
out.append(line)
return "\n".join(out)
_LIST_RE = re.compile(r"^( *)([-*+]|\d+\.)\s+(.*)$")
_BULLETS = ("\u2022", "\u25e6", "\u25aa")
def _convert_lists(text: str) -> str:
"""Convert Markdown list markers to Unicode bullets."""
out: list[str] = []
for line in text.split("\n"):
m = _LIST_RE.match(line)
if m:
depth = len(m.group(1)) // 2
marker, content = m.group(2), m.group(3)
px = " " * depth
if marker.rstrip(".").isdigit():
out.append(f"{px}{marker} {content}")
else:
out.append(f"{px}{_BULLETS[min(depth, len(_BULLETS) - 1)]} {content}")
else:
out.append(line)
return "\n".join(out)
def _convert_blockquotes(text: str) -> str:
"""Convert Markdown blockquotes to Telegram <blockquote> tags."""
out: list[str] = []
buf: list[str] = []
def _flush():
if buf:
out.append("<blockquote>" + "\n".join(buf) + "</blockquote>")
buf.clear()
for line in text.split("\n"):
m = re.match(r"^>\s?(.*)", line)
if m:
buf.append(m.group(1))
else:
_flush()
out.append(line)
_flush()
return "\n".join(out)
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