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Use builtin base64.urlsafe_b64decode and fix docstring

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This commit is contained in:
Lonami Exo 2018-08-02 13:59:27 +02:00
parent 2ca8ddbfb4
commit 3612652f39
1 changed files with 13 additions and 18 deletions
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31
telethon/utils.py
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@ -761,23 +761,18 @@ def _rle_decode(data):
def _decode_telegram_base64(string): def _decode_telegram_base64(string):
""" """
Decodes an url-safe base64-encoded string into its bytes. Decodes an url-safe base64-encoded string into its bytes
by first adding the stripped necessary padding characters.
This is the way Telegram shares binary data as strings, This is the way Telegram shares binary data as strings,
such as Bot API-style file IDs or invite links. such as Bot API-style file IDs or invite links.
Returns ``None`` if the input string was not valid.
""" """
try: try:
data = string.encode('ascii') return base64.urlsafe_b64decode(string + '=' * (len(string) % 4))
except (UnicodeEncodeError, AttributeError): except (binascii.Error, ValueError, TypeError):
return None return None # not valid base64, not valid ascii, not a string
data = data.replace(b'-', b'+').replace(
b'_', b'/') + b'=' * (len(data) % 4)
try:
return base64.b64decode(data)
except binascii.Error:
return None
def resolve_bot_file_id(file_id): def resolve_bot_file_id(file_id):
@ -850,16 +845,16 @@ def resolve_bot_file_id(file_id):
def resolve_invite_link(link): def resolve_invite_link(link):
""" """
Resolves the given invite link. Returns a tuple of Resolves the given invite link. Returns a tuple of
``(creator user id, global chat id, random int)``. ``(link creator user id, global chat id, random int)``.
Note that for broadcast channels, the creator user Note that for broadcast channels, the link creator
ID will be zero to protect their identity. Normal user ID will be zero to protect their identity.
chats and megagroup channels will have creator ID. Normal chats and megagroup channels will have such ID.
Note that the chat ID may not be accurate for chats Note that the chat ID may not be accurate for chats
with a link that were upgraded to megagroup, since with a link that were upgraded to megagroup, since
the link can remain the same, but the ID will be the link can remain the same, but the chat ID will
correct once a new link is generated. be correct once a new link is generated.
""" """
link_hash, is_link = parse_username(link) link_hash, is_link = parse_username(link)
if not is_link: if not is_link: