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[Embed] Review and port v2 code

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This commit is contained in:
Hugo Sales 2021-04-27 20:56:50 +00:00
parent c6389c63b8
commit 72cd2e7a30
3 changed files with 125 additions and 391 deletions
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220
plugins/Embed/Embed.php
View File

@ -39,15 +39,20 @@ namespace Plugin\Embed;
use App\Core\Cache;
use App\Core\DB\DB;
use App\Core\Event;
use App\Core\GSFile;
use App\Core\HTTPClient;
use App\Core\Log;
use App\Core\Modules\Plugin;
use App\Core\Router\RouteLoader;
use App\Core\Router\Router;
use App\Core\Security;
use App\Entity\Attachment;
use App\Entity\AttachmentThumbnail;
use App\Util\Common;
use App\Util\Exception\DuplicateFoundException;
use App\Util\Exception\NotFoundException;
use Plugin\Embed\Entity\FileEmbed;
use App\Util\TemporaryFile;
use Embed\Embed as LibEmbed;
use Symfony\Component\HttpFoundation\Request;
/**
@ -65,8 +70,7 @@ class Embed extends Plugin
*/
public $domain_allowlist = [
// hostname => service provider
'^i\d*\.ytimg\.com$' => 'YouTube',
'^i\d*\.vimeocdn\.com$' => 'Vimeo',
'.*' => '', // Default to allowing any host
];
/**
@ -86,67 +90,6 @@ class Embed extends Plugin
return Event::next;
}
/**
* This event executes when GNU social encounters a remote URL we then decide
* to interrogate for metadata. Embed gloms onto it to see if we have an
* oEmbed endpoint or image to try to represent in the post.
*
* @param $url string the remote URL we're looking at
* @param $dom DOMDocument the document we're getting metadata from
* @param $metadata stdClass class representing the metadata
*
* @return bool true if successful, the exception object if it isn't.
*/
public function onGetRemoteUrlMetadataFromDom(string $url, DOMDocument $dom, stdClass &$metadata)
{
try {
common_log(LOG_INFO, "Trying to find Embed data for {$url} with 'oscarotero/Embed'");
$info = self::create($url);
$metadata->version = '1.0'; // Yes.
$metadata->provider_name = $info->authorName;
$metadata->title = $info->title;
$metadata->html = common_purify($info->description);
$metadata->type = $info->type;
$metadata->url = $info->url;
$metadata->thumbnail_height = $info->imageHeight;
$metadata->thumbnail_width = $info->imageWidth;
if (substr($info->image, 0, 4) === 'data') {
// Inline image
$imgData = base64_decode(substr($info->image, stripos($info->image, 'base64,') + 7));
list($filename) = $this->validateAndWriteImage($imgData);
// Use a file URI for images, as file_embed can't store a filename
$metadata->thumbnail_url = 'file://' . File_thumbnail::path($filename);
} else {
$metadata->thumbnail_url = $info->image;
}
} catch (Exception $e) {
common_log(LOG_INFO, "Failed to find Embed data for {$url} with 'oscarotero/Embed'" .
', got exception: ' . get_class($e));
}
if (isset($metadata->thumbnail_url)) {
// sometimes sites serve the path, not the full URL, for images
// let's "be liberal in what you accept from others"!
// add protocol and host if the thumbnail_url starts with /
if ($metadata->thumbnail_url[0] == '/') {
$thumbnail_url_parsed = parse_url($metadata->url);
$metadata->thumbnail_url = "{$thumbnail_url_parsed['scheme']}://" .
"{$thumbnail_url_parsed['host']}$metadata->thumbnail_url";
}
// some wordpress opengraph implementations sometimes return a white blank image
// no need for us to save that!
if ($metadata->thumbnail_url == 'https://s0.wp.com/i/blank.jpg') {
$metadata->thumbnail_url = null;
}
// FIXME: this is also true of locally-installed wordpress so we should watch out for that.
}
return true;
}
/**
* Insert oembed and opengraph tags in all HTML head elements
*/
@ -195,20 +138,16 @@ class Embed extends Plugin
if (!is_null($attachment->getRemoteUrl()) || (!is_null($mimetype = $attachment->getMimetype()) && (('text/html' === substr($mimetype, 0, 9) || 'application/xhtml+xml' === substr($mimetype, 0, 21))))) {
try {
$embed_data = EmbedHelper::getEmbed($attachment->getRemoteUrl());
dd($embed_data);
if ($embed_data === false) {
throw new Exception("Did not get Embed data from URL {$attachment->url}");
}
$attachment->setTitle($embed_data['title']);
$embed_data = $this->getEmbed($attachment->getRemoteUrl(), $attachment);
$embed_data['attachment_id'] = $attachment->getId();
DB::persist(Entity\AttachmentEmbed::create($embed_data));
DB::flush();
} catch (Exception $e) {
Log::warning($e);
return true;
return Event::next;
}
FileEmbed::saveNew($embed_data, $attachment->getId());
}
return true;
return Event::next;
}
/**
@ -297,7 +236,7 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
*/
protected function checkAllowlist(string $url)
{
if (!$this->check_allowlist) {
if ($this->check_allowlist ?? false) {
return false; // indicates "no check made"
}
@ -333,7 +272,7 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
$headers = $head->getHeaders();
$headers = array_change_key_case($headers, CASE_LOWER);
}
return $headers['content-length'] ?? false;
return $headers['content-length'][0] ?? false;
} catch (Exception $e) {
Loog::error($e);
return false;
@ -361,7 +300,7 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
$headers = $head->getHeaders();
$headers = array_change_key_case($headers, CASE_LOWER);
}
return !empty($headers['content-type']) && GSFile::mimetypeMajor($headers['content-type']) === 'image';
return !empty($headers['content-type']) && GSFile::mimetypeMajor($headers['content-type'][0]) === 'image';
} catch (Exception $e) {
Loog::error($e);
return false;
@ -380,34 +319,32 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
$file = new TemporaryFile();
$file->write($imgData);
if (array_key_exists('content-disposition', $headers) && preg_match('/^.+; filename="(.+?)"$/', $headers['content-disposition'], $matches) === 1) {
$original_name = $matches[1];
}
$mimetype = $headers['content-type'][0];
Event::handle('AttachmentValidation', [&$file, &$mimetype]);
$mimetype = $headers['content-type'];
Event::handle('AttachmentValidation', [$file, &$mimetype]);
$hash = hash_file(Attachment::FILEHASH_ALGO, $file->getPathname());
Event::handle('HashFile', [$file->getPathname(), &$hash]);
$filename = Common::config('attachments', 'dir') . "embed/{$hash}";
$file->commit($filename);
unset($file);
return [$filename, $width, $height, $original_name, $mimetype];
if (array_key_exists('content-disposition', $headers) && preg_match('/^.+; filename="(.+?)"$/', $headers['content-disposition'][0], $matches) === 1) {
$original_name = $matches[1];
}
$info = getimagesize($filename);
$width = $info[0];
$height = $info[1];
return [$filename, $width, $height, $original_name ?? null, $mimetype];
}
/**
* Function to create and store a thumbnail representation of a remote image
*
* @param $thumbnail FileThumbnail object containing the file thumbnail
*
* @return bool true if it succeeded, the exception if it fails, or false if it
* is limited by system limits (ie the file is too large.)
* Create and store a thumbnail representation of a remote image
*/
protected function storeRemoteThumbnail(Attachment $attachment): bool
protected function storeRemoteThumbnail(Attachment $attachment): array | bool
{
$path = $attachment->getPath();
if (file_exists($path)) {
throw new AlreadyFulfilledException(_m('A thumbnail seems to already exist for remote file with id=={id}', ['id' => $attachment->id]));
if ($attachment->haveFilename() && file_exists($attachment->getPath())) {
throw new AlreadyFulfilledException(_m('A thumbnail seems to already exist for remote file with id=={id}', ['id' => $attachment->getId()]));
}
$url = $attachment->getRemoteUrl();
@ -430,8 +367,7 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
$file_size = $this->getRemoteFileSize($url, $headers);
$max_size = Common::config('attachments', 'file_quota');
if (($file_size != false) && ($file_size > $max_size)) {
Log::debug("Wanted to store remote thumbnail of size {$file_size} but the upload limit is {$max_size} so we aborted.");
return false;
throw new \Exception("Wanted to store remote thumbnail of size {$file_size} but the upload limit is {$max_size} so we aborted.");
}
} else {
return false;
@ -442,9 +378,9 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
}
// First we download the file to memory and test whether it's actually an image file
Log::debug("Downloading remote thumbnail for file id=={$attachment->id} with thumbnail URL: {$url}");
Log::debug('Downloading remote thumbnail for file id==' . $attachment->getId() . " with thumbnail URL: {$url}");
try {
$imgData = HTTPClient::get($url);
$imgData = HTTPClient::get($url)->getContent();
if (isset($imgData)) {
[$filename, $width, $height, $original_name, $mimetype] = $this->validateAndWriteImage($imgData, $url, $headers);
} else {
@ -457,10 +393,92 @@ END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]
}
}
DB::persist(AttachmentThumbnail::create(['attachment_id' => $attachment->id, 'width' => $width, 'height' => $height]));
DB::persist(AttachmentThumbnail::create(['attachment_id' => $attachment->getId(), 'width' => $width, 'height' => $height]));
$attachment->setFilename($filename);
DB::flush();
return true;
return [$filename, $width, $height, $original_name, $mimetype];
}
/**
* Perform an oEmbed or OpenGraph lookup for the given $url.
*
* Some known hosts are allowlisted with API endpoints where we
* know they exist but autodiscovery data isn't available.
*
* Throws exceptions on failure.
*
* @param string $url
*
* @throws EmbedHelper_BadHtmlException
* @throws HTTP_Request2_Exception
*
* @return object
*/
public function getEmbed(string $url, Attachment $attachment): array
{
Log::info('Checking for remote URL metadata for ' . $url);
try {
Log::info("Trying to find Embed data for {$url} with 'oscarotero/Embed'");
$embed = new LibEmbed();
$info = $embed->get($url);
$metadata['title'] = $info->title;
$metadata['html'] = Security::sanitize($info->description);
$metadata['url'] = $info->url;
$metadata['author_name'] = $info->authorName;
$metadata['author_url'] = $info->authorUrl;
$metadata['provider_name'] = $info->providerName;
$metadata['provider_url'] = $info->providerUrl;
if (!is_null($info->image)) {
if (substr($info->image, 0, 4) === 'data') {
// Inline image
$imgData = base64_decode(substr($info->image, stripos($info->image, 'base64,') + 7));
[$filename, $width, $height, $original_name, $mimetype] = $this->validateAndWriteImage($imgData);
} else {
$attachment->setRemoteUrl((string) $info->image);
[$filename, $width, $height, $original_name, $mimetype] = $this->storeRemoteThumbnail($attachment);
}
$metadata['width'] = $height;
$metadata['height'] = $width;
$metadata['mimetype'] = $mimetype;
}
} catch (Exception $e) {
Log::info("Failed to find Embed data for {$url} with 'oscarotero/Embed', got exception: " . get_class($e));
}
$metadata = self::normalize($metadata);
$attachment->setTitle($metadata['title']);
return $metadata;
}
/**
* Normalize fetched info.
*/
public static function normalize(array $data): array
{
if (isset($metadata['url'])) {
// sometimes sites serve the path, not the full URL, for images
// let's "be liberal in what you accept from others"!
// add protocol and host if the thumbnail_url starts with /
if ($metadata['url'][0] == '/') {
$thumbnail_url_parsed = parse_url($metadata['url']);
$metadata['url'] = "{$thumbnail_url_parsed['scheme']}://{$thumbnail_url_parsed['host']}{$metadata['url']}";
}
// Some wordpress opengraph implementations sometimes return a white blank image
// no need for us to save that!
if ($metadata['url'] == 'https://s0.wp.com/i/blank.jpg') {
$metadata['url'] = null;
}
if (!isset($data['width'])) {
$data['width'] = Common::config('thumbnail', 'width');
$data['height'] = Common::config('thumbnail', 'height');
}
}
return $data;
}
}

191
plugins/Embed/EmbedHelper.php
View File

@ -1,191 +0,0 @@
<?php
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
/**
* OembedPlugin implementation for GNU social
*
* @package GNUsocial
*
* @author Mikael Nordfeldth
* @author hannes
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @author Hugo Sales <hugo@hsal.es>
* @copyright 2019, 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
namespace Plugin\Embed;
use App\Core\Event;
use App\Core\HTTPClient;
use App\Core\Log;
/**
* Utility class to wrap basic embed lookups.
*
* Denylisted hosts will use an alternate lookup method.
* Allowlisted hosts will use known embed API endpoints.
*
* Sites that provide discovery links will use them directly; a bug
* in use of discovery links with query strings is worked around.
*
* Others will fall back to oohembed (unless disabled).
* The API endpoint can be configured or disabled through config
* as 'oohembed'/'endpoint'.
*
* @copyright 2019, 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class EmbedHelper
{
/**
* Perform or fake an oEmbed lookup for the given $url.
*
* Some known hosts are allowlisted with API endpoints where we
* know they exist but autodiscovery data isn't available.
*
* A few hosts are denylisted due to known problems with oohembed,
* in which case we'll look up the info another way and return
* equivalent data.
*
* Throws exceptions on failure.
*
* @param string $url
*
* @throws EmbedHelper_BadHtmlException
* @throws HTTP_Request2_Exception
*
* @return object
*/
public static function getEmbed(string $url)
{
Log::info('Checking for remote URL metadata for ' . $url);
$metadata = new \stdClass();
if (Event::handle('GetRemoteUrlMetadata', [$url, &$metadata])) {
// If that event didn't return anything, try downloading the body and parse it
$response = HTTPClient::get($url);
$body = $response->getBody();
// DOMDocument::loadHTML may throw warnings on unrecognized elements,
// and notices on unrecognized namespaces.
$old = error_reporting(error_reporting() & ~(E_WARNING | E_NOTICE));
// DOMDocument assumes ISO-8859-1 per HTML spec
// use UTF-8 if we find any evidence of that encoding
$utf8_evidence = false;
$unicode_check_dom = new DOMDocument();
$ok = $unicode_check_dom->loadHTML($body);
if (!$ok) {
throw new EmbedHelper_BadHtmlException();
}
$metaNodes = $unicode_check_dom->getElementsByTagName('meta');
foreach ($metaNodes as $metaNode) {
// case in-sensitive since Content-type and utf-8 can be written in many ways
if (stristr($metaNode->getAttribute('http-equiv'), 'content-type')
&& stristr($metaNode->getAttribute('content'), 'utf-8')) {
$utf8_evidence = true;
break;
} elseif (stristr($metaNode->getAttribute('charset'), 'utf-8')) {
$utf8_evidence = true;
break;
}
}
unset($unicode_check_dom);
// The Content-Type HTTP response header overrides encoding metatags in DOM
if (stristr($response->getHeader('Content-Type'), 'utf-8')) {
$utf8_evidence = true;
}
// add utf-8 encoding prolog if we have reason to believe this is utf-8 content
// DOMDocument('1.0', 'UTF-8') does not work!
$utf8_tag = $utf8_evidence ? '<?xml encoding="utf-8" ?>' : '';
$dom = new DOMDocument();
$ok = $dom->loadHTML($utf8_tag . $body);
unset($body); // storing the DOM in memory is enough...
error_reporting($old);
if (!$ok) {
throw new EmbedHelper_BadHtmlException();
}
Event::handle('GetRemoteUrlMetadataFromDom', [$url, $dom, &$metadata]);
}
return self::normalize($metadata);
}
/**
* Normalize oEmbed format.
*
* @param stdClass $data
*
* @throws Exception
*
* @return object
*/
public static function normalize(stdClass $data)
{
if (empty($data->type)) {
throw new Exception('Invalid oEmbed data: no type field.');
}
if ($data->type == 'image') {
// YFrog does this.
$data->type = 'photo';
}
if (isset($data->thumbnail_url)) {
if (!isset($data->thumbnail_width)) {
// !?!?!
$data->thumbnail_width = Common::config('thumbnail', 'width');
$data->thumbnail_height = Common::config('thumbnail', 'height');
}
}
return $data;
}
}
class EmbedHelper_Exception extends \Exception
{
public function __construct($message = '', $code = 0, $previous = null)
{
parent::__construct($message, $code, $previous);
}
}
class EmbedHelper_BadHtmlException extends EmbedHelper_Exception
{
public function __construct($previous = null)
{
return parent::__construct('Bad HTML in discovery data.', 0, $previous);
}
}
class EmbedHelper_DiscoveryException extends EmbedHelper_Exception
{
public function __construct($previous = null)
{
return parent::__construct('No oEmbed discovery data.', 0, $previous);
}
}

105
plugins/Embed/Entity/AttachmentEmbed.php
View File

@ -35,13 +35,15 @@ namespace Plugin\Embed\Entity;
use App\Core\Entity;
/**
* Table Definition for file_embed
* Table Definition for attachment_embed
*
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
* @author Hugo Sales <hugo@hsal.es>
* @copyright 2019, 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class AttachmentEmbed extends Entity
{
// {{{ Autocode
public $attachment_id; // int(4) primary_key not_null
public $version; // varchar(20)
public $type; // varchar(20)
@ -56,6 +58,7 @@ class AttachmentEmbed extends Entity
public $author_url; // varchar(191) not 255 because utf8mb4 takes more space
public $url; // varchar(191) not 255 because utf8mb4 takes more space
public $modified; // timestamp() not_null default_CURRENT_TIMESTAMP
// }}} Autocode
public static function schemaDef()
{
@ -63,8 +66,6 @@ class AttachmentEmbed extends Entity
'name' => 'attachment_embed',
'fields' => [
'attachment_id' => ['type' => 'int', 'not null' => true, 'description' => 'oEmbed for that URL/file'],
'version' => ['type' => 'varchar', 'length' => 20, 'description' => 'oEmbed spec. version'],
'type' => ['type' => 'varchar', 'length' => 20, 'description' => 'oEmbed type: photo, video, link, rich'],
'mimetype' => ['type' => 'varchar', 'length' => 50, 'description' => 'mime type of resource'],
'provider' => ['type' => 'text', 'description' => 'name of this oEmbed provider'],
'provider_url' => ['type' => 'text', 'description' => 'URL of this oEmbed provider'],
@ -79,102 +80,8 @@ class AttachmentEmbed extends Entity
],
'primary key' => ['attachment_id'],
'foreign keys' => [
'file_embed_file_id_fkey' => ['file', ['file_id' => 'id']],
'attachment_embed_attachment_id_fkey' => ['attachment', ['attachment_id' => 'id']],
],
];
}
/**
* Fetch an entry by using a File's id
*/
public static function getByFile(File $file)
{
$fo = new File_embed();
$fo->file_id = $file->id;
if (!$fo->find(true)) {
throw new NoResultException($fo);
}
return $fo;
}
public function getUrl()
{
return $this->url;
}
/**
* Save embedding info for a new file.
*
* @param object $data Services_oEmbed_Object_*
* @param int $file_id
*/
public static function saveNew($data, $file_id)
{
$file_embed = new File_embed;
$file_embed->file_id = $file_id;
if (!isset($data->version)) {
common_debug('Embed: data->version undefined in variable $data: ' . var_export($data, true));
}
$file_embed->version = $data->version;
$file_embed->type = $data->type;
if (!empty($data->provider)) {
$file_embed->provider = $data->provider;
}
if (!empty($data->provider_name)) {
$file_embed->provider = $data->provider_name;
}
if (!empty($data->provider_url)) {
$file_embed->provider_url = $data->provider_url;
}
if (!empty($data->width)) {
$file_embed->width = (int) ($data->width);
}
if (!empty($data->height)) {
$file_embed->height = (int) ($data->height);
}
if (!empty($data->html)) {
$file_embed->html = $data->html;
}
if (!empty($data->title)) {
$file_embed->title = $data->title;
}
if (!empty($data->author_name)) {
$file_embed->author_name = $data->author_name;
}
if (!empty($data->author_url)) {
$file_embed->author_url = $data->author_url;
}
if (!empty($data->url)) {
$file_embed->url = $data->url;
$given_url = File_redirection::_canonUrl($file_embed->url);
if (!empty($given_url)) {
try {
$file = File::getByUrl($given_url);
$file_embed->mimetype = $file->mimetype;
} catch (NoResultException $e) {
// File_redirection::where argument 'discover' is false to avoid loops
$redir = File_redirection::where($given_url, false);
if (!empty($redir->file_id)) {
$file_id = $redir->file_id;
}
}
}
}
$result = $file_embed->insert();
if ($result === false) {
throw new ServerException('Failed to insert File_embed data into database!');
}
if (!empty($data->thumbnail_url) || ($data->type == 'photo')) {
$ft = File_thumbnail::getKV('file_id', $file_id);
if ($ft instanceof File_thumbnail) {
common_log(
LOG_WARNING,
"Strangely, a File_thumbnail object exists for new file {$file_id}",
__FILE__
);
} else {
File_thumbnail::saveNew($data, $file_id);
}
}
}
}