ztr/TelegramPWA
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Sticker Picker: Fix missing some covers on iOS (#1083)

Browse Source
This commit is contained in:
Alexander Zinchuk 2021-05-12 15:28:31 +03:00
parent ce3b908464
commit b5cd16643d
1 changed files with 35 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
src/api/gramjs/methods/media.ts
View File

@ -157,12 +157,12 @@ async function download(
return { mimeType, data, fullSize };
} else if (entityType === 'stickerSet') {
const data = await client.downloadStickerSetThumb(entity);
const mimeType = mediaFormat === ApiMediaFormat.Lottie ? 'application/json' : 'image/jpeg';
const mimeType = mediaFormat === ApiMediaFormat.Lottie ? 'application/json' : getMimeType(data);
return { mimeType, data };
} else {
const data = await client.downloadProfilePhoto(entity, mediaMatch[1] === 'profile');
const mimeType = 'image/jpeg';
const mimeType = getMimeType(data);
return { mimeType, data };
}
@ -218,3 +218,36 @@ function prepareMedia(mediaData: ApiParsedMedia): ApiPreparedMedia {
return mediaData;
}
function getMimeType(data: Uint8Array, fallbackMimeType = 'image/jpeg') {
if (data.length < 4) {
return fallbackMimeType;
}
let type = fallbackMimeType;
const signature = data.subarray(0, 4).reduce((result, byte) => result + byte.toString(16), '');
// https://en.wikipedia.org/wiki/List_of_file_signatures
switch (signature) {
case '89504e47':
type = 'image/png';
break;
case '47494638':
type = 'image/gif';
break;
case 'ffd8ffe0':
case 'ffd8ffe1':
case 'ffd8ffe2':
case 'ffd8ffe3':
case 'ffd8ffe8':
type = 'image/jpeg';
break;
case '52494646':
// In our case only webp is expected
type = 'image/webp';
break;
}
return type;
}