9a515b9234
Avoid the use of deprecated MariaDB "zero dates" globally. If they're present as attribute defaults somewhere, they will be replaced with NULL implicitly. The existing "zero dates" in MariaDB storage will be left intact and this should not present any issues. The "timestamp" type in table definitions now corresponds to DATETIME in MariaDB with "DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP", which should be close enough to the original behaviour for compatibility purposes. It is now the recommended type for "modified" attributes, because of the update trigger on MariaDB. But there is no such trigger implemented on PostgreSQL as of this moment.
488 lines
18 KiB
PHP
488 lines
18 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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defined('GNUSOCIAL') || die();
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/**
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* Table Definition for file_redirection
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*/
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class File_redirection extends Managed_DataObject
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{
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###START_AUTOCODE
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/* the code below is auto generated do not remove the above tag */
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public $__table = 'file_redirection'; // table name
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public $urlhash; // varchar(64) primary_key not_null
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public $url; // text
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public $file_id; // int(4)
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public $redirections; // int(4)
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public $httpcode; // int(4)
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public $modified; // timestamp() not_null default_CURRENT_TIMESTAMP
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/* the code above is auto generated do not remove the tag below */
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###END_AUTOCODE
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protected $file; /* Cache the associated file sometimes */
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public static function schemaDef()
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{
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return array(
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'fields' => array(
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'urlhash' => array('type' => 'varchar', 'length' => 64, 'not null' => true, 'description' => 'sha256 hash of the URL'),
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'url' => array('type' => 'text', 'description' => 'short URL (or any other kind of redirect) for file (id)'),
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'file_id' => array('type' => 'int', 'description' => 'short URL for what URL/file'),
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'redirections' => array('type' => 'int', 'description' => 'redirect count'),
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'httpcode' => array('type' => 'int', 'description' => 'HTTP status code (20x, 30x, etc.)'),
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'modified' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date this record was modified'),
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),
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'primary key' => array('urlhash'),
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'foreign keys' => array(
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'file_redirection_file_id_fkey' => array('file', array('file_id' => 'id')),
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),
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);
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}
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public static function getByUrl($url)
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{
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return self::getByPK(array('urlhash' => File::hashurl($url)));
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}
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public static function _commonHttp($url, $redirs)
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{
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$request = new HTTPClient($url);
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$request->setConfig(array(
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'connect_timeout' => 10, // # seconds to wait
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'max_redirs' => $redirs, // # max number of http redirections to follow
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'follow_redirects' => false, // We follow redirects ourselves in lib/httpclient.php
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'store_body' => false, // We won't need body content here.
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));
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return $request;
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}
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/**
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* Check if this URL is a redirect and return redir info.
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*
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* Most code should call File_redirection::where instead, to check if we
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* already know that redirection and avoid extra hits to the web.
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*
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* The URL is hit and any redirects are followed, up to 10 levels or until
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* a protected URL is reached.
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*
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* @param string $in_url
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* @return mixed one of:
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* string - target URL, if this is a direct link or can't be followed
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* array - redirect info if this is an *unknown* redirect:
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* associative array with the following elements:
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* code: HTTP status code
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* redirects: count of redirects followed
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* url: URL string of final target
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* type (optional): MIME type from Content-Type header
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* size (optional): byte size from Content-Length header
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* time (optional): timestamp from Last-Modified header
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*/
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public static function lookupWhere($short_url, $redirs = 10, $protected = false)
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{
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if ($redirs < 0) {
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return false;
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}
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if (strpos($short_url, '://') === false) {
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return $short_url;
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}
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try {
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$request = self::_commonHttp($short_url, $redirs);
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// Don't include body in output
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$request->setMethod(HTTP_Request2::METHOD_HEAD);
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$response = $request->send();
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if (405 == $response->getStatus() || 204 == $response->getStatus()) {
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// HTTP 405 Unsupported Method
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// Server doesn't support HEAD method? Can this really happen?
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// We'll try again as a GET and ignore the response data.
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//
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// HTTP 204 No Content
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// YFrog sends 204 responses back for our HEAD checks, which
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// seems like it may be a logic error in their servers. If
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// we get a 204 back, re-run it as a GET... if there's really
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// no content it'll be cheap. :)
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$request = self::_commonHttp($short_url, $redirs);
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$response = $request->send();
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} elseif (400 == $response->getStatus()) {
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throw new Exception('Got error 400 on HEAD request, will not go further.');
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}
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} catch (Exception $e) {
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// Invalid URL or failure to reach server
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common_log(LOG_ERR, "Error while following redirects for $short_url: " . $e->getMessage());
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return $short_url;
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}
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// if last url after all redirections is protected,
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// use the url before it in the redirection chain
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if ($response->getRedirectCount() && File::isProtected($response->getEffectiveUrl())) {
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$return_url = $response->redirUrls[$response->getRedirectCount() - 1];
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} else {
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$return_url = $response->getEffectiveUrl();
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}
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$ret = array('code' => $response->getStatus()
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, 'redirects' => $response->getRedirectCount()
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, 'url' => $return_url);
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$type = $response->getHeader('Content-Type');
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if ($type) {
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$ret['type'] = $type;
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}
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if ($protected) {
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$ret['protected'] = true;
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}
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$size = $response->getHeader('Content-Length'); // @fixme bytes?
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if ($size) {
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$ret['size'] = $size;
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}
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$time = $response->getHeader('Last-Modified');
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if ($time) {
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$ret['time'] = strtotime($time);
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}
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return $ret;
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}
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/**
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* Check if this URL is a redirect and return redir info.
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* If a File record is present for this URL, it is not considered a redirect.
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* If a File_redirection record is present for this URL, the recorded target is returned.
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*
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* If no File or File_redirect record is present, the URL is hit and any
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* redirects are followed, up to 10 levels or until a protected URL is
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* reached.
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*
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* @param string $in_url
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* @param boolean $discover true to attempt dereferencing the redirect if we don't know it already
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* @return File_redirection
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*/
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public static function where($in_url, $discover = true)
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{
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$redir = new File_redirection();
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$redir->url = $in_url;
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$redir->urlhash = File::hashurl($redir->url);
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$redir->redirections = 0;
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try {
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$r = File_redirection::getByUrl($in_url);
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try {
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$f = File::getByID($r->file_id);
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$r->file = $f;
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$r->redir_url = $f->url;
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} catch (NoResultException $e) {
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// Invalid entry, delete and run again
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common_log(
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LOG_ERR,
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'Could not find File with id=' . $r->file_id . ' referenced in File_redirection, deleting File redirection entry and and trying again...'
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);
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$r->delete();
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return self::where($in_url);
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}
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// File_redirecion and File record found, return both
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return $r;
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} catch (NoResultException $e) {
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// File_redirecion record not found, but this might be a direct link to a file
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try {
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$f = File::getByUrl($in_url);
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$redir->file_id = $f->id;
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$redir->file = $f;
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return $redir;
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} catch (NoResultException $e) {
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// nope, this was not a direct link to a file either, let's keep going
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}
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}
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if ($discover) {
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// try to follow redirects and get the final url
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$redir_info = File_redirection::lookupWhere($in_url);
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if (is_string($redir_info)) {
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$redir_info = array('url' => $redir_info);
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}
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// the last url in the redirection chain can actually be a redirect!
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// this is the case with local /attachment/{file_id} links
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// in that case we have the file id already
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try {
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$r = File_redirection::getByUrl($redir_info['url']);
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$f = File::getKV('id', $r->file_id);
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if ($f instanceof File) {
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$redir->file = $f;
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$redir->redir_url = $f->url;
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} else {
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// Invalid entry in File_redirection, delete and run again
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common_log(
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LOG_ERR,
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'Could not find File with id=' . $r->file_id . ' referenced in File_redirection, deleting File_redirection entry and trying again...'
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);
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$r->delete();
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return self::where($in_url);
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}
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} catch (NoResultException $e) {
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// save the file now when we know that we don't have it in File_redirection
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try {
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$redir->file = File::saveNew($redir_info, $redir_info['url']);
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} catch (ServerException $e) {
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common_log(LOG_ERR, $e);
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}
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}
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// If this is a redirection and we have a file to redirect to, save it
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// (if it doesn't exist in File_redirection already)
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if ($redir->file instanceof File && $redir_info['url'] != $in_url) {
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try {
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$file_redir = File_redirection::getByUrl($in_url);
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} catch (NoResultException $e) {
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$file_redir = new File_redirection();
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$file_redir->urlhash = File::hashurl($in_url);
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$file_redir->url = $in_url;
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$file_redir->file_id = $redir->file->getID();
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$file_redir->insert();
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$file_redir->redir_url = $redir->file->url;
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}
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$file_redir->file = $redir->file;
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return $file_redir;
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}
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}
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return $redir;
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}
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/**
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* Shorten a URL with the current user's configured shortening
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* options, if applicable.
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*
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* If it cannot be shortened or the "short" URL is longer than the
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* original, the original is returned.
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*
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* If the referenced item has not been seen before, embedding data
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* may be saved.
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*
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* @param string $long_url
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* @param User $user whose shortening options to use; defaults to the current web session user
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* @return string
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*/
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public static function makeShort($long_url, $user = null)
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{
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$canon = File_redirection::_canonUrl($long_url);
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$short_url = File_redirection::_userMakeShort($canon, $user);
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// Did we get one? Is it shorter?
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return !empty($short_url) ? $short_url : $long_url;
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}
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/**
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* Shorten a URL with the current user's configured shortening
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* options, if applicable.
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*
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* If it cannot be shortened or the "short" URL is longer than the
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* original, the original is returned.
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*
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* If the referenced item has not been seen before, embedding data
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* may be saved.
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*
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* @param string $long_url
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* @return string
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*/
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public static function forceShort($long_url, $user)
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{
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$canon = File_redirection::_canonUrl($long_url);
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$short_url = File_redirection::_userMakeShort($canon, $user, true);
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// Did we get one? Is it shorter?
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return !empty($short_url) ? $short_url : $long_url;
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}
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public static function _userMakeShort($long_url, User $user = null, $force = false)
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{
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$short_url = common_shorten_url($long_url, $user, $force);
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if (!empty($short_url) && $short_url != $long_url) {
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$short_url = (string)$short_url;
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// store it
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try {
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$file = File::getByUrl($long_url);
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} catch (NoResultException $e) {
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// Check if the target URL is itself a redirect...
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// This should already have happened in processNew in common_shorten_url()
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$redir = File_redirection::where($long_url);
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$file = $redir->file;
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}
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// Now we definitely have a File object in $file
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try {
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$file_redir = File_redirection::getByUrl($short_url);
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} catch (NoResultException $e) {
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$file_redir = new File_redirection();
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$file_redir->urlhash = File::hashurl($short_url);
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$file_redir->url = $short_url;
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$file_redir->file_id = $file->getID();
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$file_redir->insert();
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}
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return $short_url;
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}
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return null;
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}
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/**
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* Basic attempt to canonicalize a URL, cleaning up some standard variants
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* such as funny syntax or a missing path. Used internally when cleaning
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* up URLs for storage and following redirect chains.
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*
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* Note that despite being on File_redirect, this function DOES NOT perform
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* any dereferencing of redirects.
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*
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* @param string $in_url input URL
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* @param string $default_scheme if given a bare link; defaults to 'http://'
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* @return string
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*/
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public static function _canonUrl($in_url, $default_scheme = 'http://')
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{
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if (empty($in_url)) {
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return false;
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}
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$out_url = $in_url;
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$p = parse_url($out_url);
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if (empty($p['host']) || empty($p['scheme'])) {
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list($scheme) = explode(':', $in_url, 2);
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switch (strtolower($scheme)) {
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case 'fax':
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case 'tel':
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$out_url = str_replace('.-()', '', $out_url);
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break;
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// non-HTTP schemes, so no redirects
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case 'bitcoin':
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case 'mailto':
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case 'aim':
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case 'jabber':
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case 'xmpp':
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// don't touch anything
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break;
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// URLs without domain name, so no redirects
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case 'magnet':
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// don't touch anything
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break;
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// URLs with coordinates, not browsable domain names
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case 'geo':
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// don't touch anything
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break;
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default:
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$out_url = $default_scheme . ltrim($out_url, '/');
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$p = parse_url($out_url);
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if (empty($p['scheme'])) {
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return false;
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}
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break;
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}
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}
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if (('ftp' == $p['scheme']) || ('ftps' == $p['scheme']) || ('http' == $p['scheme']) || ('https' == $p['scheme'])) {
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if (empty($p['host'])) {
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return false;
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}
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if (empty($p['path'])) {
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$out_url .= '/';
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}
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}
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return $out_url;
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}
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public static function saveNew($data, $file_id, $url)
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{
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$file_redir = new File_redirection;
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$file_redir->urlhash = File::hashurl($url);
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$file_redir->url = $url;
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$file_redir->file_id = $file_id;
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$file_redir->redirections = intval($data['redirects']);
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$file_redir->httpcode = intval($data['code']);
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$file_redir->insert();
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}
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public static function beforeSchemaUpdate()
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{
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$table = strtolower(get_called_class());
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$schema = Schema::get();
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$schemadef = $schema->getTableDef($table);
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// 2015-02-19 We have to upgrade our table definitions to have the urlhash field populated
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if (isset($schemadef['fields']['urlhash']) && in_array('urlhash', $schemadef['primary key'])) {
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// We already have the urlhash field, so no need to migrate it.
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return;
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}
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echo "\nFound old $table table, upgrading it to contain 'urlhash' field...";
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// We have to create a urlhash that is _not_ the primary key,
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// transfer data and THEN run checkSchema
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$schemadef['fields']['urlhash'] = [
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'type' => 'varchar',
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'length' => 64,
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'not null' => true,
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'description' => 'sha256 hash of the URL',
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];
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$schemadef['fields']['url'] = [
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'type' => 'text',
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'description' => 'short URL (or any other kind of redirect) for file (id)',
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];
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unset($schemadef['primary key']);
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$schema->ensureTable($table, $schemadef);
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echo "DONE.\n";
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$classname = ucfirst($table);
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$tablefix = new $classname;
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// urlhash is hash('sha256', $url) in the File table
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echo "Updating urlhash fields in $table table...";
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switch (common_config('db', 'type')) {
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case 'pgsql':
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$url_sha256 = 'encode(sha256(CAST("url" AS bytea)), \'hex\')';
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break;
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case 'mysql':
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$url_sha256 = 'sha2(`url`, 256)';
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break;
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default:
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throw new ServerException('Unknown DB type selected.');
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}
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$tablefix->query(sprintf(
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'UPDATE %1$s SET urlhash = %2$s;',
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$tablefix->escapedTableName(),
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$url_sha256
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));
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echo "DONE.\n";
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echo "Resuming core schema upgrade...";
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}
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public function getFile()
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{
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if (!$this->file instanceof File) {
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$this->file = File::getByID($this->file_id);
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}
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return $this->file;
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}
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}
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