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rss-bridge/bridges/TelegramBridge.php

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<?php
class TelegramBridge extends BridgeAbstract
{
const NAME = 'Telegram Bridge';
const URI = 'https://t.me';
const DESCRIPTION = 'Returns newest posts from a *public* Telegram channel';
const MAINTAINER = 'VerifiedJoseph';
const PARAMETERS = [[
'username' => [
'name' => 'Username',
'type' => 'text',
'required' => true,
'exampleValue' => '@rssbridge',
]
]
];
const TEST_DETECT_PARAMETERS = [
'https://t.me/s/rssbridge' => ['username' => 'rssbridge'],
'https://t.me/rssbridge' => ['username' => 'rssbridge'],
'http://t.me/rssbridge' => ['username' => 'rssbridge'],
'https://telegram.me/s/rssbridge' => ['username' => 'rssbridge'],
'https://telegram.me/rssbridge' => ['username' => 'rssbridge'],
'http://telegram.me/rssbridge' => ['username' => 'rssbridge'],
'http://rssbridge.t.me/' => ['username' => 'rssbridge'],
'https://rssbridge.t.me/' => ['username' => 'rssbridge'],
];
const CACHE_TIMEOUT = 60 * 15; // 15 mins
private $feedName = '';
private $enclosures = [];
private $itemTitle = '';
private const BACKGROUND_IMAGE_REGEX = "/background-image:url\('(.*)'\)/";
public function collectData()
{
$html = getSimpleHTMLDOM($this->getURI());
$channelTitle = $html->find('div.tgme_channel_info_header_title span', 0)->plaintext ?? '';
$channelTitle = htmlspecialchars_decode($channelTitle, ENT_QUOTES);
$this->feedName = $channelTitle . ' (@' . $this->normalizeUsername() . ')';
$posts = $html->find('div.tgme_widget_message_wrap.js-widget_message_wrap');
if (!$channelTitle && !$posts) {
throw new \Exception('Unable to find channel. The channel is non-existing or non-public.');
}
foreach ($posts as $messageDiv) {
$this->itemTitle = '';
$this->enclosures = [];
$item = [];
$item['uri'] = $messageDiv->find('a.tgme_widget_message_date', 0)->href;
$item['content'] = $this->processContent($messageDiv);
$item['title'] = $this->itemTitle;
$item['timestamp'] = $messageDiv->find('span.tgme_widget_message_meta', 0)->find('time', 0)->datetime;
$item['enclosures'] = $this->enclosures;
$messageOwner = $messageDiv->find('a.tgme_widget_message_owner_name', 0);
if ($messageOwner) {
$item['author'] = html_entity_decode(trim($messageOwner->plaintext), ENT_QUOTES);
}
$this->items[] = $item;
}
$this->items = array_reverse($this->items);
}
private function processContent($messageDiv)
{
$message = '';
$notSupported = $messageDiv->find('div.message_media_not_supported_wrap', 0);
if ($notSupported) {
// For unknown reasons, the telegram preview page omits the content of this post
$message = 'RSS-Bridge was unable to find the content of this post.<br><br>' . $notSupported->innertext;
}
if ($messageDiv->find('div.tgme_widget_message_forwarded_from', 0)) {
$message .= $messageDiv->find('div.tgme_widget_message_forwarded_from', 0)->innertext . '<br><br>';
}
if ($messageDiv->find('a.tgme_widget_message_reply', 0)) {
$message .= $this->processReply($messageDiv);
}
if ($messageDiv->find('div.tgme_widget_message_sticker_wrap', 0)) {
$message .= $this->processSticker($messageDiv);
}
if ($messageDiv->find('div.tgme_widget_message_poll', 0)) {
$message .= $this->processPoll($messageDiv);
}
if ($messageDiv->find('video', 0)) {
$message .= $this->processVideo($messageDiv);
}
if ($messageDiv->find('a.tgme_widget_message_photo_wrap', 0)) {
$message .= $this->processPhoto($messageDiv);
}
if ($messageDiv->find('a.not_supported', 0)) {
$message .= $this->processNotSupported($messageDiv);
}
if ($messageDiv->find('div.tgme_widget_message_text.js-message_text', 0)) {
$message .= $messageDiv->find('div.tgme_widget_message_text.js-message_text', 0);
$this->itemTitle = $this->ellipsisTitle(
$messageDiv->find('div.tgme_widget_message_text.js-message_text', 0)->plaintext
);
}
if ($messageDiv->find('div.tgme_widget_message_document', 0)) {
$message .= $this->processAttachment($messageDiv);
}
if ($messageDiv->find('a.tgme_widget_message_link_preview', 0)) {
$message .= $this->processLinkPreview($messageDiv);
}
if ($messageDiv->find('a.tgme_widget_message_location_wrap', 0)) {
$message .= $this->processLocation($messageDiv);
}
return $message;
}
public function getURI()
{
$username = $this->getInput('username');
if ($username) {
return self::URI . '/s/' . $this->normalizeUsername();
}
return parent::getURI();
}
public function getName()
{
if ($this->feedName) {
return $this->feedName . ' - Telegram';
}
return parent::getName();
}
private function processReply($messageDiv)
{
$reply = $messageDiv->find('a.tgme_widget_message_reply', 0);
$author = $reply->find('span.tgme_widget_message_author_name', 0)->plaintext;
$text = '';
if ($reply->find('div.tgme_widget_message_metatext', 0)) {
$text = $reply->find('div.tgme_widget_message_metatext', 0)->innertext;
}
if ($reply->find('div.tgme_widget_message_text', 0)) {
$text = $reply->find('div.tgme_widget_message_text', 0)->innertext;
}
return <<<EOD
<blockquote>{$author}<br>
{$text}
<a href="{$reply->href}">{$reply->href}</a></blockquote><hr>
EOD;
}
private function processSticker($messageDiv)
{
if (!$this->itemTitle) {
$this->itemTitle = '@' . $this->normalizeUsername() . ' posted a sticker';
}
$stickerDiv = $messageDiv->find('div.tgme_widget_message_sticker_wrap', 0);
if ($stickerDiv->find('picture', 0)) {
$stickerDiv->find('picture', 0)->find('div', 0)->style = '';
$stickerDiv->find('picture', 0)->style = '';
return $stickerDiv;
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}
$var = $stickerDiv->find('i', 0);
if ($var) {
$style = $var->style;
if (preg_match(self::BACKGROUND_IMAGE_REGEX, $style, $sticker)) {
return <<<EOD
<a href="{$stickerDiv->children(0)->herf}"><img src="{$sticker[1]}"></a>
EOD;
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}
}
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return '';
}
private function processPoll($messageDiv)
{
$poll = $messageDiv->find('div.tgme_widget_message_poll', 0);
$title = $poll->find('div.tgme_widget_message_poll_question', 0)->plaintext;
$type = $poll->find('div.tgme_widget_message_poll_type', 0)->plaintext;
if (!$this->itemTitle) {
$this->itemTitle = $title;
}
$pollOptions = '<ul>';
foreach ($poll->find('div.tgme_widget_message_poll_option') as $option) {
$pollOptions .= '<li>' . $option->children(0)->plaintext . ' - ' .
$option->find('div.tgme_widget_message_poll_option_text', 0)->plaintext . '</li>';
}
$pollOptions .= '</ul>';
return <<<EOD
{$title}<br><small>$type</small><br>{$pollOptions}
EOD;
}
private function processLinkPreview($messageDiv)
{
$image = '';
$title = '';
$site = '';
$description = '';
$preview = $messageDiv->find('a.tgme_widget_message_link_preview', 0);
if (trim($preview->innertext) === '') {
return '';
}
if (
$preview->find('i', 0) &&
preg_match(self::BACKGROUND_IMAGE_REGEX, $preview->find('i', 0)->style, $photo)
) {
$image = '<img src="' . $photo[1] . '"/>';
}
if ($preview->find('div.link_preview_title', 0)) {
$title = $preview->find('div.link_preview_title', 0)->plaintext;
}
if ($preview->find('div.link_preview_site_name', 0)) {
$site = $preview->find('div.link_preview_site_name', 0)->plaintext;
}
if ($preview->find('div.link_preview_description', 0)) {
$description = $preview->find('div.link_preview_description', 0)->plaintext;
}
return <<<EOD
<blockquote><a href="{$preview->href}">{$image}</a><br><a href="{$preview->href}">
{$title} - {$site}</a><br>{$description}</blockquote>
EOD;
}
private function processVideo($messageDiv)
{
if (!$this->itemTitle) {
$this->itemTitle = '@' . $this->normalizeUsername() . ' posted a video';
}
if ($messageDiv->find('i.tgme_widget_message_video_thumb')) {
preg_match(self::BACKGROUND_IMAGE_REGEX, $messageDiv->find('i.tgme_widget_message_video_thumb', 0)->style, $photo);
} elseif ($messageDiv->find('i.link_preview_video_thumb')) {
preg_match(self::BACKGROUND_IMAGE_REGEX, $messageDiv->find('i.link_preview_video_thumb', 0)->style, $photo);
} elseif ($messageDiv->find('i.tgme_widget_message_roundvideo_thumb')) {
preg_match(self::BACKGROUND_IMAGE_REGEX, $messageDiv->find('i.tgme_widget_message_roundvideo_thumb', 0)->style, $photo);
} else {
// Not all videos have a poster image
$photo = [null, null];
}
$this->enclosures[] = $photo[1];
// Intentionally omitting preload="none" on <video>
return <<<EOD
<video controls="" poster="{$photo[1]}" style="max-width:100%;">
<source src="{$messageDiv->find('video', 0)->src}" type="video/mp4">
</video>
EOD;
}
private function processPhoto($messageDiv)
{
if (!$this->itemTitle) {
$this->itemTitle = '@' . $this->normalizeUsername() . ' posted a photo';
}
$photos = '';
foreach ($messageDiv->find('a.tgme_widget_message_photo_wrap') as $photoWrap) {
preg_match(self::BACKGROUND_IMAGE_REGEX, $photoWrap->style, $photo);
$photos .= <<<EOD
<a href="{$photoWrap->href}"><img src="{$photo[1]}"/></a><br>
EOD;
}
return $photos;
}
private function processNotSupported($messageDiv)
{
if (!$this->itemTitle) {
$this->itemTitle = '@' . $this->normalizeUsername() . ' posted a video';
}
if ($messageDiv->find('i.tgme_widget_message_video_thumb')) {
preg_match(self::BACKGROUND_IMAGE_REGEX, $messageDiv->find('i.tgme_widget_message_video_thumb', 0)->style, $photo);
} elseif ($messageDiv->find('i.link_preview_video_thumb')) {
preg_match(self::BACKGROUND_IMAGE_REGEX, $messageDiv->find('i.link_preview_video_thumb', 0)->style, $photo);
} else {
// Unsupported content ususally don't have a preview image
$photo = [null, null];
}
return <<<EOD
<a href="{$messageDiv->find('a.not_supported', 0)->href}">
{$messageDiv->find('div.message_media_not_supported_label', 0)->innertext}<br><br>
{$messageDiv->find('span.message_media_view_in_telegram', 0)->innertext}<br><br>
<img src="{$photo[1]}"/></a>
EOD;
}
private function processAttachment($messageDiv)
{
$attachments = 'File attachments:<br>';
if (!$this->itemTitle) {
$this->itemTitle = '@' . $this->normalizeUsername() . ' posted an attachment';
}
foreach ($messageDiv->find('div.tgme_widget_message_document') as $document) {
$attachments .= <<<EOD
{$document->find('div.tgme_widget_message_document_title', 0)->plaintext} -
{$document->find('div.tgme_widget_message_document_extra', 0)->plaintext}<br>
EOD;
}
return $attachments;
}
private function processLocation($messageDiv)
{
if (!$this->itemTitle) {
$this->itemTitle = '@' . $this->normalizeUsername() . ' posted a location';
}
preg_match(self::BACKGROUND_IMAGE_REGEX, $messageDiv->find('div.tgme_widget_message_location', 0)->style, $image);
$link = $messageDiv->find('a.tgme_widget_message_location_wrap', 0)->href;
return <<<EOD
<a href="{$link}"><img src="{$image[1]}"></a>
EOD;
}
// todo: extract truncate
private function ellipsisTitle($text)
{
$length = 100;
if (strlen($text) > $length) {
$text = explode('<br>', wordwrap($text, $length, '<br>'));
return $text[0] . '...';
}
return $text;
}
private function normalizeUsername()
{
// todo: can be replaced with ltrim($username, '@');
$username = $this->getInput('username');
if (substr($username, 0, 1) === '@') {
return substr($username, 1);
}
return $username;
}
public function detectParameters($url)
{
$detectParamsRegex = '/^https?:\/\/(?:(?:t|telegram)\.me\/(?:s\/)?([\w]+)|([\w]+)\.t\.me\/?)$/';
$params = [];
if (preg_match($detectParamsRegex, $url, $matches) > 0) {
if ($matches[1] !== '') {
$params['username'] = $matches[1];
}
if (isset($matches[2]) && $matches[2] !== '') {
$params['username'] = $matches[2];
}
return $params;
}
return null;
}
}