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Decode and encode Telegram bot API file IDs!

This library was initially created for MadelineProto, an async PHP client API for the telegram MTProto protocol.

Install

composer require danog/tg-file-decoder

Examples:

Decoding bot API file IDs

use danog\Decoder\FileId;
use danog\Decoder\UniqueFileId;

$fileId = FileId::fromBotAPI('CAACAgQAAxkDAAJEsl44nl3yxPZ8biI8uhaA7rbQceOSAAKtAQACsTisUXvMEbVnTuQkGAQ');

$version = $fileId->version; // bot API file ID version, usually 4
$subVersion = $fileId->subVersion; // bot API file ID subversion, equivalent to a specific tdlib version

$dcId = $fileId->dcId; // On which datacenter is this file stored

$type = $fileId->type; // File type

$id = $fileId->id;
$accessHash = $fileId->accessHash;

$fileReference = $fileId->fileReference; // File reference, https://core.telegram.org/api/file_reference
$url = $fileId->url; // URL, file IDs with encoded webLocation

// You can also use hasFileReference and hasUrl
$fileIdReencoded = $fileId->getBotAPI(); // CAACAgQAAxkDAAJEsl44nl3yxPZ8biI8uhaA7rbQceOSAAKtAQACsTisUXvMEbVnTuQkGAQ
$fileIdReencoded = (string) $fileId; // CAACAgQAAxkDAAJEsl44nl3yxPZ8biI8uhaA7rbQceOSAAKtAQACsTisUXvMEbVnTuQkGAQ

// For photos, thumbnails if ($fileId->getType() <= FileIdType::PHOTO->value)
$volumeId = $fileId->volumeId;
$localId = $fileId->localId;

$photoSizeSource = $fileId->photoSizeSource; // PhotoSizeSource object
$photoSizeSource->dialogId;
$photoSizeSource->stickerSetId;

// And more, depending on photosize source

The bot API subversion, present since file IDs v4, is equivalent to the version of tdlib used server-side in the bot API.

For file types, see file types. For photosize source, see here.

Decoding bot API unique file IDs

$uniqueFileId = UniqueFileId::fromUniqueBotAPI('AgADrQEAArE4rFE');

$type = $fileId->type; // Unique file type

$id = $uniqueFileId->id;
$url = $uniqueFileId->url; // URL, for unique file IDs with encoded webLocation

// For photos
$volumeId = $uniqueFileId->volumeId;
$localId = $uniqueFileId->localId;

For unique file types, see unique types.

Extracting unique file IDs from full file IDs

$full = 'CAACAgQAAxkDAAJEsl44nl3yxPZ8biI8uhaA7rbQceOSAAKtAQACsTisUXvMEbVnTuQkGAQ';
$unique = 'AgADrQEAArE4rFE';

$fileId = FileId::fromBotAPI($full);
$uniqueFileId = UniqueFileId::fromUniqueBotAPI($unique);
$uniqueFileIdExtracted1 = UniqueFileId::fromBotAPI($full);

$uniqueFileIdExtracted2 = $fileId->getUniqueBotAPI();

var_dump(((string) $uniqueFileId) === ((string) $uniqueFileIdExtracted1)); // true, always AgADrQEAArE4rFE!
var_dump(((string) $uniqueFileId) === ((string) $uniqueFileIdExtracted2)); // true, always AgADrQEAArE4rFE!

Photosize source

$fileId = FileId::fromString('CAACAgQAAxkDAAJEsl44nl3yxPZ8biI8uhaA7rbQceOSAAKtAQACsTisUXvMEbVnTuQkGAQ');

$photoSizeSource = $fileId->photoSizeSource; // PhotoSizeSource object

$sourceType = $photoSizeSource->type;

// If $sourceType === PHOTOSIZE_SOURCE_DIALOGPHOTO_SMALL|PHOTOSIZE_SOURCE_DIALOGPHOTO_SMALL or 
// If $photoSizeSource instanceof PhotoSizeSourceDialogPhoto
$dialogId = $photoSizeSource->dialogId;
$dialogId = $photoSizeSource->sticketSetId;

The PhotoSizeSource abstract base class indicates the source of a specific photosize from a chat photo, photo, stickerset thumbnail, file thumbnail.

Click here » to view the full list of PhotoSizeSource types.

Building custom file IDs

$fileId = new FileId(
 type: FileIdType::STICKER,
 id: $id,
 accessHash: $accessHash,
 // and so on...
);

$encoded = (string) $fileId; // CAACAgQAAxkDAAJEsl44nl3yxPZ8biI8uhaA7rbQceOSAAKtAQACsTisUXvMEbVnTuQkGAQ, or something

Bot API file ID types

The file type is a PHP enum indicating the type of file, danog\Decoder\FileIdType.

Click here » to view the full list of file ID types.

The enum also offers a FileIdType::from method that can be used to obtain the correct case, from a string version of the file type, typically the one used in bot API file objects.

Bot API unique file ID types

The unique file type is a PHP enum uniquely indicating the unique file, danog\Decoder\UniqueFileIdType.

Click here » to view the full list of file ID types.

Full API documentation

Click here » to view the full API documentation.