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# Hydrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2023 Dan <https://github.com/delivrance>
# Copyright (C) 2023-present Hydrogram <https://hydrogram.org>
#
# This file is part of Hydrogram.
#
# Hydrogram 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.
#
# Hydrogram 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 Hydrogram. If not, see <http://www.gnu.org/licenses/>.
import html
import logging
import re
from html.parser import HTMLParser
from typing import Optional
import hydrogram
from hydrogram import raw
from hydrogram.enums import MessageEntityType
from hydrogram.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: "hydrogram.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"] = attrs.get("language", "")
elif tag == "spoiler":
entity = raw.types.MessageEntitySpoiler
elif tag == "a":
url = attrs.get("href", "")
if mention := Parser.MENTION_RE.match(url):
entity = raw.types.InputMessageEntityMentionName
extra["user_id"] = int(mention.group(1))
else:
entity = raw.types.MessageEntityTextUrl
extra["url"] = url
elif tag == "emoji":
entity = raw.types.MessageEntityCustomEmoji
custom_emoji_id = int(attrs.get("id"))
extra["document_id"] = custom_emoji_id
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("Unmatched closing tag </%s> at line %s:%s", 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: Optional["hydrogram.Client"]):
self.client = client
async def parse(self, text: str):
# Strip whitespaces from the beginning and the end, but preserve closing tags
text = re.sub(r"^\s*(<[\w<>=\s\"]*>)\s*", r"\1", text)
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.info("Unclosed tags: %s", ", ".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)
# Remove zero-length entities
entities = list(filter(lambda x: x.length > 0, entities))
return {
"message": utils.remove_surrogates(parser.text),
"entities": sorted(entities, key=lambda e: e.offset) or None,
}
@staticmethod
def unparse(text: str, entities: list):
def parse_one(entity):
"""
Parses a single entity and returns (start_tag, start), (end_tag, end)
"""
entity_type = entity.type
start = entity.offset
end = start + entity.length
if entity_type in {
MessageEntityType.BOLD,
MessageEntityType.ITALIC,
MessageEntityType.UNDERLINE,
MessageEntityType.STRIKETHROUGH,
}:
name = entity_type.name[0].lower()
start_tag = f"<{name}>"
end_tag = f"</{name}>"
elif entity_type == MessageEntityType.PRE:
name = entity_type.name.lower()
language = getattr(entity, "language", "") or ""
start_tag = f'<{name} language="{language}">' if language else f"<{name}>"
end_tag = f"</{name}>"
elif entity_type in {
MessageEntityType.CODE,
MessageEntityType.BLOCKQUOTE,
MessageEntityType.SPOILER,
}:
name = entity_type.name.lower()
start_tag = f"<{name}>"
end_tag = f"</{name}>"
elif entity_type == MessageEntityType.TEXT_LINK:
url = entity.url
start_tag = f'<a href="{url}">'
end_tag = "</a>"
elif entity_type == MessageEntityType.TEXT_MENTION:
user = entity.user
start_tag = f'<a href="tg://user?id={user.id}">'
end_tag = "</a>"
elif entity_type == MessageEntityType.CUSTOM_EMOJI:
custom_emoji_id = entity.custom_emoji_id
start_tag = f'<emoji id="{custom_emoji_id}">'
end_tag = "</emoji>"
else:
return None
return (start_tag, start), (end_tag, end)
def recursive(entity_i: int) -> int:
"""
Takes the index of the entity to start parsing from, returns the number of parsed entities inside it.
Uses entities_offsets as a stack, pushing (start_tag, start) first, then parsing nested entities,
and finally pushing (end_tag, end) to the stack.
No need to sort at the end.
"""
this = parse_one(entities[entity_i])
if this is None:
return 1
(start_tag, start), (end_tag, end) = this
entities_offsets.append((start_tag, start))
internal_i = entity_i + 1
# while the next entity is inside the current one, keep parsing
while internal_i < len(entities) and entities[internal_i].offset < end:
internal_i += recursive(internal_i)
entities_offsets.append((end_tag, end))
return internal_i - entity_i
text = utils.add_surrogates(text)
entities_offsets = []
# probably useless because entities are already sorted by telegram
entities.sort(key=lambda e: (e.offset, -e.length))
# main loop for first-level entities
i = 0
while i < len(entities):
i += recursive(i)
if entities_offsets:
last_offset = entities_offsets[-1][1]
# no need to sort, but still add entities starting from the end
for entity, offset in reversed(entities_offsets):
text = (
text[:offset]
+ entity
+ html.escape(text[offset:last_offset])
+ text[last_offset:]
)
last_offset = offset
return utils.remove_surrogates(text)
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