def encode(self, *, major: int = None, minor: int = None):
major = major if major is not None else self.MAJOR
minor = minor if minor is not None else self.MINOR
buffer = BytesIO()
file_type = self.file_type
if self.url:
file_type |= WEB_LOCATION_FLAG
if self.file_reference:
file_type |= FILE_REFERENCE_FLAG
buffer.write(struct.pack("<ii", file_type, self.dc_id))
if self.url:
buffer.write(String(self.url))
if self.file_reference:
buffer.write(Bytes(self.file_reference))
buffer.write(struct.pack("<qq", self.media_id, self.access_hash))
if self.file_type in PHOTO_TYPES:
buffer.write(struct.pack("<q", self.volume_id))
if major >= 4:
buffer.write(struct.pack("<i", self.thumbnail_source))
if self.thumbnail_source == ThumbnailSource.LEGACY:
buffer.write(struct.pack("<qi", self.secret, self.local_id))
elif self.thumbnail_source == ThumbnailSource.THUMBNAIL:
buffer.write(struct.pack(
"<iii",
self.thumbnail_file_type,
ord(self.thumbnail_size),
self.local_id
))
elif self.thumbnail_source in (ThumbnailSource.CHAT_PHOTO_SMALL, ThumbnailSource.CHAT_PHOTO_BIG):
buffer.write(struct.pack(
"<qqi",
self.chat_id,
self.chat_access_hash,
self.local_id
))
elif self.thumbnail_source == ThumbnailSource.STICKER_SET_THUMBNAIL:
buffer.write(struct.pack(
"<qqi",
self.sticker_set_id,
self.sticker_set_access_hash,
self.local_id
))
elif file_type in DOCUMENT_TYPES:
buffer.write(struct.pack("<ii", minor, major))
buffer.write(struct.pack("<bb", minor, major))
return b64_encode(rle_encode(buffer.getvalue()))
def decode(file_id: str):
decoded = rle_decode(b64_decode(file_id))
# region read version
# File id versioning. Major versions lower than 4 don't have a minor version
major = decoded[-1]
if major < 4:
minor = 0
buffer = BytesIO(decoded[:-1])
else:
minor = decoded[-2]
buffer = BytesIO(decoded[:-2])
# endregion
file_type, dc_id = struct.unpack("<ii", buffer.read(8))
# region media type flags
# Check for flags existence
has_web_location = bool(file_type & WEB_LOCATION_FLAG)
has_file_reference = bool(file_type & FILE_REFERENCE_FLAG)
# Remove flags to restore the actual type id value
file_type &= ~WEB_LOCATION_FLAG
file_type &= ~FILE_REFERENCE_FLAG
# endregion
try:
file_type = FileType(file_type)
except ValueError:
raise ValueError(
f"Unknown file_type {file_type} of file_id {file_id}")
if has_web_location:
url = String.read(buffer)
access_hash, = struct.unpack("<q", buffer.read(8))
return FileId(major=major,
minor=minor,
file_type=file_type,
dc_id=dc_id,
url=url,
access_hash=access_hash)
file_reference = Bytes.read(buffer) if has_file_reference else b""
media_id, access_hash = struct.unpack("<qq", buffer.read(16))
if file_type in PHOTO_TYPES:
volume_id, = struct.unpack("<q", buffer.read(8))
thumbnail_source, = (0, ) if major < 4 else struct.unpack(
"<i", buffer.read(4))
try:
thumbnail_source = ThumbnailSource(thumbnail_source)
except ValueError:
raise ValueError(
f"Unknown thumbnail_source {thumbnail_source} of file_id {file_id}"
)
if thumbnail_source == ThumbnailSource.LEGACY:
secret, local_id = struct.unpack("<qi", buffer.read(12))
return FileId(major=major,
minor=minor,
file_type=file_type,
dc_id=dc_id,
file_reference=file_reference,
media_id=media_id,
access_hash=access_hash,
volume_id=volume_id,
thumbnail_source=thumbnail_source,
secret=secret,
local_id=local_id)
if thumbnail_source == ThumbnailSource.THUMBNAIL:
thumbnail_file_type, thumbnail_size, local_id = struct.unpack(
"<iii", buffer.read(12))
thumbnail_size = chr(thumbnail_size)
return FileId(major=major,
minor=minor,
file_type=file_type,
dc_id=dc_id,
file_reference=file_reference,
media_id=media_id,
access_hash=access_hash,
volume_id=volume_id,
thumbnail_source=thumbnail_source,
thumbnail_file_type=thumbnail_file_type,
thumbnail_size=thumbnail_size,
local_id=local_id)
if thumbnail_source in (ThumbnailSource.CHAT_PHOTO_SMALL,
ThumbnailSource.CHAT_PHOTO_BIG):
chat_id, chat_access_hash, local_id = struct.unpack(
"<qqi", buffer.read(20))
return FileId(major=major,
minor=minor,
file_type=file_type,
dc_id=dc_id,
file_reference=file_reference,
media_id=media_id,
access_hash=access_hash,
volume_id=volume_id,
thumbnail_source=thumbnail_source,
chat_id=chat_id,
chat_access_hash=chat_access_hash,
local_id=local_id)
if thumbnail_source == ThumbnailSource.STICKER_SET_THUMBNAIL:
sticker_set_id, sticker_set_access_hash, local_id = struct.unpack(
"<qqi", buffer.read(20))
return FileId(major=major,
minor=minor,
file_type=file_type,
dc_id=dc_id,
file_reference=file_reference,
media_id=media_id,
access_hash=access_hash,
volume_id=volume_id,
thumbnail_source=thumbnail_source,
sticker_set_id=sticker_set_id,
sticker_set_access_hash=sticker_set_access_hash,
local_id=local_id)
if file_type in DOCUMENT_TYPES:
return FileId(major=major,
minor=minor,
file_type=file_type,
dc_id=dc_id,
file_reference=file_reference,
media_id=media_id,
access_hash=access_hash)