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184 lines (145 loc) · 5.86 KB
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# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2020 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 collections import OrderedDict
from html.parser import HTMLParser
from typing import Union
import pyrogram
from pyrogram.api import types
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.BaseClient"):
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 = types.MessageEntityBold
elif tag in ["i", "em"]:
entity = types.MessageEntityItalic
elif tag == "u":
entity = types.MessageEntityUnderline
elif tag in ["s", "del", "strike"]:
entity = types.MessageEntityStrike
elif tag == "blockquote":
entity = types.MessageEntityBlockquote
elif tag == "code":
entity = types.MessageEntityCode
elif tag == "pre":
entity = types.MessageEntityPre
extra["language"] = ""
elif tag == "a":
url = attrs.get("href", "")
mention = Parser.MENTION_RE.match(url)
if mention:
entity = types.InputMessageEntityMentionName
extra["user_id"] = int(mention.group(1))
else:
entity = 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.warning("Unmatched closing tag </{}> at line {}:{}".format(tag, 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: Union["pyrogram.BaseClient", None]):
self.client = client
def parse(self, text: str):
# Strip whitespace characters from the end of the message, but preserve closing tags
text = re.sub(r"\s*(</[\w\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("<{}> (x{})".format(tag, len(entities)))
log.warning("Unclosed tags: {}".format(", ".join(unclosed_tags)))
entities = []
for entity in parser.entities:
if isinstance(entity, types.InputMessageEntityMentionName):
try:
if self.client is not None:
entity.user_id = self.client.resolve_peer(entity.user_id)
except PeerIdInvalid:
continue
entities.append(entity)
# TODO: OrderedDict to be removed in Python 3.6
return OrderedDict([
("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", "strike"):
start_tag = "<{}>".format(entity_type[0])
end_tag = "</{}>".format(entity_type[0])
elif entity_type in ("code", "pre", "blockquote"):
start_tag = "<{}>".format(entity_type)
end_tag = "</{}>".format(entity_type)
elif entity_type == "text_link":
url = entity.url
start_tag = '<a href="{}">'.format(url)
end_tag = "</a>"
elif entity_type == "text_mention":
user = entity.user
start_tag = '<a href="tg://user?id={}">'.format(user.id)
end_tag = "</a>"
else:
continue
entities_offsets.append((start_tag, start,))
entities_offsets.append((end_tag, end,))
# sorting by offset (desc)
entities_offsets.sort(key=lambda x: -x[1])
for entity, offset in entities_offsets:
text = text[:offset] + entity + text[offset:]
return utils.remove_surrogates(text)