424 lines
16 KiB
PHP
424 lines
16 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2008, 2009, StatusNet, Inc.
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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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 $file; /* Cache the associated file sometimes */
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public static function schemaDef()
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{
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return array(
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'fields' => array(
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'urlhash' => array('type' => 'varchar', 'length' => 64, 'not null' => true, 'description' => 'sha256 hash of the URL'),
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'url' => array('type' => 'text', 'description' => 'short URL (or any other kind of redirect) for file (id)'),
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'file_id' => array('type' => 'int', 'description' => 'short URL for what URL/file'),
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'redirections' => array('type' => 'int', 'description' => 'redirect count'),
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'httpcode' => array('type' => 'int', 'description' => 'HTTP status code (20x, 30x, etc.)'),
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'modified' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date this record was modified'),
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),
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'primary key' => array('urlhash'),
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'foreign keys' => array(
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'file_redirection_file_id_fkey' => array('file' => array('file_id' => 'id')),
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),
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);
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}
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static public function getByUrl($url)
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{
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return self::getByPK(array('urlhash' => File::hashurl($url)));
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}
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static function _commonHttp($url, $redirs) {
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$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 $in_url
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* @return mixed one of:
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* string - target URL, if this is a direct link or can't be followed
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* array - redirect info if this is an *unknown* redirect:
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* associative array with the following elements:
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* code: HTTP status code
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* redirects: count of redirects followed
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* url: URL string of final target
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* type (optional): MIME type from Content-Type header
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* size (optional): byte size from Content-Length header
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* time (optional): timestamp from Last-Modified header
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*/
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static function lookupWhere($short_url, $redirs = 10, $protected = false) {
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if ($redirs < 0) return false;
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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) $ret['type'] = $type;
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if ($protected) $ret['protected'] = true;
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$size = $response->getHeader('Content-Length'); // @fixme bytes?
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if ($size) $ret['size'] = $size;
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$time = $response->getHeader('Last-Modified');
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if ($time) $ret['time'] = strtotime($time);
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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 $discover true to attempt dereferencing the redirect if we don't know it already
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* @return File_redirection
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*/
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static function where($in_url, $discover=true) {
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$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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if($r instanceof File_redirection) {
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try {
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$f = File::getKV('id',$r->file_id);
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$r->file = $f;
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$r->redir_url = $f->url;
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} catch (NoResultException $e) {
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// Invalid entry, delete and run again
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common_log(LOG_ERR, "Could not find File with id=".$r->file_id." referenced in File_redirection, deleting File redirection entry and creating new File and File_redirection entries.");
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$r->delete();
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return self::where($in_url);
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}
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return $r;
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}
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} catch (NoResultException $e) {
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try {
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$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 $e) {
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// Oh well, let's keep going
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}
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}
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if ($discover) {
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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' => $redir_info);
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}
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// Save the file if we don't have it already
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$redir->file = File::saveNew($redir_info,$redir_info['url']);
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// If this is a redirection, save it
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// (if it hasn't been saved yet by some other process while we we
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// were running lookupWhere())
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if($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 $user whose shortening options to use; defaults to the current web session user
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* @return string
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*/
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static function makeShort($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 $long_url
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* @return string
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*/
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static function forceShort($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 : $long_url;
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}
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static function _userMakeShort($long_url, User $user=null, $force = false) {
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$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 $default_scheme if given a bare link; defaults to 'http://'
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* @return string
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*/
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static function _canonUrl($in_url, $default_scheme = 'http://') {
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if (empty($in_url)) return false;
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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('.-()', '', $out_url);
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break;
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// non-HTTP schemes, so no redirects
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case 'bitcoin':
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case 'mailto':
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case 'aim':
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case 'jabber':
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case 'xmpp':
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// don't touch anything
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break;
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// URLs without domain name, so no redirects
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case 'magnet':
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// don't touch anything
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break;
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default:
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$out_url = $default_scheme . ltrim($out_url, '/');
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$p = parse_url($out_url);
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if (empty($p['scheme'])) return false;
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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'])) return false;
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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 $out_url;
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}
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static function saveNew($data, $file_id, $url) {
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$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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static public 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'] = array (
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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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$schemadef['fields']['url'] = array (
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'type' => 'text',
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'description' => 'short URL (or any other kind of redirect) for file (id)',
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);
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unset($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 $table table...";
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// Maybe very MySQL specific :(
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$tablefix->query(sprintf('UPDATE %1$s SET %2$s=%3$s;',
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$schema->quoteIdentifier($table),
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'urlhash',
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// The line below is "result of sha256 on column `url`"
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'SHA2(url, 256)'));
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echo "DONE.\n";
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echo "Resuming core schema upgrade...";
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}
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public function getFile() {
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if(empty($this->file) && $this->file_id) {
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$this->file = File::getKV('id', $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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