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190 lines (151 loc) · 5.95 KB
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# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-present Dan <https://github.com/delivrance>
#
# 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)