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# Pyrogram - Telegram MTProto API Client Library for Python

# This file is part of Pyrogram.

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

import html

import logging

import re

from html.parser import HTMLParser

from typing import Optional

import pyrogram

from pyrogram import raw

from pyrogram.errors import PeerIdInvalid

from . import utils

log = logging.getLogger(__name__)

class Parser(HTMLParser):

MENTION_RE = re.compile(r"tg://user\?id=(\d+)")

def __init__(self, client: "pyrogram.Client"):

super().__init__()

self.client = client

self.text = ""

self.entities = []

self.tag_entities = {}

def handle_starttag(self, tag, attrs):

attrs = dict(attrs)

extra = {}

if tag in ["b", "strong"]:

entity = raw.types.MessageEntityBold

elif tag in ["i", "em"]:

entity = raw.types.MessageEntityItalic

elif tag == "u":

entity = raw.types.MessageEntityUnderline

elif tag in ["s", "del", "strike"]:

entity = raw.types.MessageEntityStrike

elif tag == "blockquote":

entity = raw.types.MessageEntityBlockquote

elif tag == "code":

entity = raw.types.MessageEntityCode

elif tag == "pre":

entity = raw.types.MessageEntityPre

extra["language"] = ""

elif tag == "spoiler":

entity = raw.types.MessageEntitySpoiler

elif tag == "a":

url = attrs.get("href", "")

mention = Parser.MENTION_RE.match(url)

if mention:

entity = raw.types.InputMessageEntityMentionName

extra["user_id"] = int(mention.group(1))

else:

entity = raw.types.MessageEntityTextUrl

extra["url"] = url

else:

return

if tag not in self.tag_entities:

self.tag_entities[tag] = []

self.tag_entities[tag].append(entity(offset=len(self.text), length=0, **extra))

def handle_data(self, data):

data = html.unescape(data)

for entities in self.tag_entities.values():

for entity in entities:

entity.length += len(data)

self.text += data

def handle_endtag(self, tag):

try:

self.entities.append(self.tag_entities[tag].pop())

except (KeyError, IndexError):

line, offset = self.getpos()

offset += 1

log.debug(f"Unmatched closing tag </{tag}> at line {line}:{offset}")

else:

if not self.tag_entities[tag]:

self.tag_entities.pop(tag)

def error(self, message):

pass

class HTML:

def __init__(self, client: Optional["pyrogram.Client"]):

self.client = client

async def parse(self, text: str):

# Strip whitespace characters from the end of the message, but preserve closing tags

text = re.sub(r"\s*(</[\w</>]*>)\s*$", r"\1", text)

parser = Parser(self.client)

parser.feed(utils.add_surrogates(text))

parser.close()

if parser.tag_entities:

unclosed_tags = []

for tag, entities in parser.tag_entities.items():

unclosed_tags.append(f"<{tag}> (x{len(entities)})")

log.warning(f"Unclosed tags: {', '.join(unclosed_tags)}")

entities = []

for entity in parser.entities:

if isinstance(entity, raw.types.InputMessageEntityMentionName):

try:

if self.client is not None:

entity.user_id = await self.client.resolve_peer(entity.user_id)

except PeerIdInvalid:

continue

entities.append(entity)

return {

"message": utils.remove_surrogates(parser.text),

"entities": sorted(entities, key=lambda e: e.offset)

}

@staticmethod

def unparse(text: str, entities: list):

text = utils.add_surrogates(text)

entities_offsets = []

for entity in entities:

entity_type = entity.type

start = entity.offset

end = start + entity.length

if entity_type in ("bold", "italic", "underline", "strikethrough"):

start_tag = f"<{entity_type[0]}>"

end_tag = f"</{entity_type[0]}>"

elif entity_type in ("code", "pre", "blockquote", "spoiler"):

start_tag = f"<{entity_type}>"

end_tag = f"</{entity_type}>"

elif entity_type == "text_link":

url = entity.url

start_tag = f'<a href="{url}">'

end_tag = "</a>"

elif entity_type == "text_mention":

user = entity.user

start_tag = f'<a href="tg://user?id={user.id}">'

end_tag = "</a>"

else:

continue

entities_offsets.append((start_tag, start,))

entities_offsets.append((end_tag, end,))

entities_offsets = map(

lambda x: x[1],

sorted(

enumerate(entities_offsets),

key = lambda x: (x[1][1], x[0]),

reverse = True

)

for entity, offset in entities_offsets:

text = text[:offset] + entity + text[offset:]

return utils.remove_surrogates(text)

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