tg-file-decoder

Decode Telegram bot API file IDs.

Install

composer require danog/tg-file-decoder

On 32-bit systems, phpseclib is also required.

Examples:

Decoding bot API file IDs

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

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

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

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

$type = $fileId->getType(); // File type
$typeName = $fileId->getTypeName(); // File type (as string)

$id = $fileId->getId();
$accessHash = $fileId->getAccessHash();

$fileReference = $fileId->getFileReference(); // File reference, https://core.telegram.org/api/file_reference
$url = $fileId->getUrl(); // 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() <= PHOTO)
$volumeId = $fileId->getVolumeID();
$localId = $fileId->getLocalID();

// if $fileId->hasPhotoSizeSource()
$photoSizeSource = $fileId->getPhotoSizeSource(); // PhotoSizeSource object
$photoSizeSource->getDialogId();
$photoSizeSource->getStickerSetId();

// 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->getType(); // Unique file type
$typeName = $fileId->getTypeName(); // Unique file type (as string)

$id = $uniqueFileId->getId();
$accessHash = $uniqueFileId->getAccessHash();
$url = $uniqueFileId->getUrl(); // URL, for unique file IDs with encoded webLocation
// You can also use hasUrl

// For photos
$volumeId = $uniqueFileId->getVolumeID();
$localId = $uniqueFileId->getLocalID();

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->getPhotoSizeSource(); // PhotoSizeSource object

$sourceType = $photoSizeSource->getType();

// If $sourceType === PHOTOSIZE_SOURCE_DIALOGPHOTO_SMALL|PHOTOSIZE_SOURCE_DIALOGPHOTO_SMALL or 
// If $photoSizeSource instanceof PhotoSizeSourceDialogPhoto
$dialogId = $photoSizeSource->getDialogId();
$dialogId = $photoSizeSource->getStickerSetId();

The PhotoSizeSource abstract base class indicates the source of a specific photosize from a chat photo, photo, stickerset thumbnail, file thumbnail. Each photosize type (getType) is mapped to a specific subclass of the PhotoSizeSource abstract class, returned when calling getPhotoSizeSource. The photosize type is one of:

const PHOTOSIZE_SOURCE_LEGACY = 0 - Legacy, used for file IDs with the deprecated secret field, returns PhotoSizeSourceLegacy class.
const PHOTOSIZE_SOURCE_THUMBNAIL = 1 - Used for document and photo thumbnail, returns PhotoSizeSourceThumbnail class.
const PHOTOSIZE_SOURCE_DIALOGPHOTO_SMALL = 2 - Used for dialog photos, returns PhotoSizeSourceDialogPhoto class.
const PHOTOSIZE_SOURCE_DIALOGPHOTO_BIG = 3 - Used for dialog photos, returns PhotoSizeSourceDialogPhoto class.
const PHOTOSIZE_SOURCE_STICKERSET_THUMBNAIL = 4 - Used for document and photo thumbnails, returns PhotoSizeSourceThumbnail class.

Building custom file IDs

$fileId = new FileId;

$fileId->setType(STICKER);
$fileId->setId($id);
$fileId->setAccessHash($customHash);

// You get it...

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

All classes, from FileId, to UniqueFileID, to PhotoSizeSource can be built using set methods for each and every field.

Bot API file ID types

The file type is a numeric constant indicating the type of file, (the constant is always in the danog\Decoder namespace). The file type name is a string version of the file type, typically the one used in bot API file objects.

The TYPES array contains a file type => file type name map. The TYPES_IDS array contains a file type name => file type map.

const CONSTANTNAME = value - Description (type name)

const THUMBNAIL = 0 - Thumbnail (thumbnail)
const PROFILE_PHOTO = 1 - Profile photo; used for users, supergroups and channels, chat photos are normal PHOTOs (profile_photo)
const PHOTO = 2 - Photo (photo)
const VOICE = 3 - Voice message (voice)
const VIDEO = 4 - Video (video)
const DOCUMENT = 5 - Document (document)
const ENCRYPTED = 6 - Secret chat document (encrypted)
const TEMP = 7 - Temp document (temp)
const STICKER = 8 - Sticker (sticker)
const AUDIO = 9 - Music (audio)
const ANIMATION = 10 - GIF (animation)
const ENCRYPTED_THUMBNAIL = 11 - Thumbnail of secret chat document (encrypted_thumbnail)
const WALLPAPER = 12 - Wallpaper (wallpaper)
const VIDEO_NOTE = 13 - Round video (video_note)
const SECURE_RAW = 14 - Passport raw file (secure_raw)
const SECURE = 15 - Passport file (secure)
const WALLPAPER = 16 - Background (background)
const WALLPAPER = 17 - Size (size)
const NONE = 18 -

Bot API unique file ID types

The unique file type is a numeric constant indicating the type of the unique file ID, (the constant is always in the danog\Decoder namespace). The unique file type name is a string version of the unique file type, typically the one used in bot API file objects.

The UNIQUE_TYPES array contains a unique file type => unique file type name map. The UNIQUE_TYPES_IDS array contains a unique file type name => unique file type map. The FULL_UNIQUE_MAP array contains a full file type => unique file type map.

const UNIQUE_WEB = 0 - Used for web files (all file types that have a URL (hasUrl))
const UNIQUE_PHOTO = 1 - Used for photos and similar (getType() <= PHOTO)
const UNIQUE_DOCUMENT = 2 - Used for all other types of files (documents, audio, video, voice, sticker, animation, video note)
const UNIQUE_SECURE = 3 - Used for passport files
const UNIQUE_ENCRYPTED = 4 - Used for secret chat files
const UNIQUE_TEMP = 5 - Used for temp files

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