gnu-social/classes/File_redirection.php

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<?php
/*
2009-08-25 23:14:12 +01:00
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2008, 2009, StatusNet, Inc.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
if (!defined('GNUSOCIAL')) { exit(1); }
/**
* Table Definition for file_redirection
*/
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class File_redirection extends Managed_DataObject
{
###START_AUTOCODE
/* the code below is auto generated do not remove the above tag */
public $__table = 'file_redirection'; // table name
public $urlhash; // varchar(64) primary_key not_null
public $url; // text
public $file_id; // int(4)
public $redirections; // int(4)
public $httpcode; // int(4)
public $modified; // timestamp() not_null default_CURRENT_TIMESTAMP
/* the code above is auto generated do not remove the tag below */
###END_AUTOCODE
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public static function schemaDef()
{
return array(
'fields' => array(
'urlhash' => array('type' => 'varchar', 'length' => 64, 'not null' => true, 'description' => 'sha256 hash of the URL'),
'url' => array('type' => 'text', 'description' => 'short URL (or any other kind of redirect) for file (id)'),
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'file_id' => array('type' => 'int', 'description' => 'short URL for what URL/file'),
'redirections' => array('type' => 'int', 'description' => 'redirect count'),
'httpcode' => array('type' => 'int', 'description' => 'HTTP status code (20x, 30x, etc.)'),
'modified' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date this record was modified'),
),
'primary key' => array('urlhash'),
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'foreign keys' => array(
'file_redirection_file_id_fkey' => array('file' => array('file_id' => 'id')),
),
);
}
static public function getByUrl($url)
{
return self::getByPK(array('urlhash' => File::hashurl($url)));
}
static function _commonHttp($url, $redirs) {
$request = new HTTPClient($url);
$request->setConfig(array(
'connect_timeout' => 10, // # seconds to wait
'max_redirs' => $redirs, // # max number of http redirections to follow
'follow_redirects' => true, // Follow redirects
'store_body' => false, // We won't need body content here.
));
return $request;
}
/**
* Check if this URL is a redirect and return redir info.
*
* Most code should call File_redirection::where instead, to check if we
* already know that redirection and avoid extra hits to the web.
*
* The URL is hit and any redirects are followed, up to 10 levels or until
* a protected URL is reached.
*
* @param string $in_url
* @return mixed one of:
* string - target URL, if this is a direct link or can't be followed
* array - redirect info if this is an *unknown* redirect:
* associative array with the following elements:
* code: HTTP status code
* redirects: count of redirects followed
* url: URL string of final target
* type (optional): MIME type from Content-Type header
* size (optional): byte size from Content-Length header
* time (optional): timestamp from Last-Modified header
*/
static function lookupWhere($short_url, $redirs = 10, $protected = false) {
if ($redirs < 0) return false;
if(strpos($short_url,'://') === false){
return $short_url;
}
try {
$request = self::_commonHttp($short_url, $redirs);
// Don't include body in output
$request->setMethod(HTTP_Request2::METHOD_HEAD);
$response = $request->send();
if (405 == $response->getStatus() || 204 == $response->getStatus()) {
// HTTP 405 Unsupported Method
// Server doesn't support HEAD method? Can this really happen?
// We'll try again as a GET and ignore the response data.
//
// HTTP 204 No Content
// YFrog sends 204 responses back for our HEAD checks, which
// seems like it may be a logic error in their servers. If
// we get a 204 back, re-run it as a GET... if there's really
// no content it'll be cheap. :)
$request = self::_commonHttp($short_url, $redirs);
$response = $request->send();
}
} catch (Exception $e) {
// Invalid URL or failure to reach server
common_log(LOG_ERR, "Error while following redirects for $short_url: " . $e->getMessage());
return $short_url;
}
if ($response->getRedirectCount() && File::isProtected($response->getUrl())) {
// Bump back up the redirect chain until we find a non-protected URL
return self::lookupWhere($short_url, $response->getRedirectCount() - 1, true);
}
$ret = array('code' => $response->getStatus()
, 'redirects' => $response->getRedirectCount()
, 'url' => $response->getUrl());
$type = $response->getHeader('Content-Type');
if ($type) $ret['type'] = $type;
if ($protected) $ret['protected'] = true;
$size = $response->getHeader('Content-Length'); // @fixme bytes?
if ($size) $ret['size'] = $size;
$time = $response->getHeader('Last-Modified');
if ($time) $ret['time'] = strtotime($time);
return $ret;
}
/**
* Check if this URL is a redirect and return redir info.
* If a File record is present for this URL, it is not considered a redirect.
* If a File_redirection record is present for this URL, the recorded target is returned.
*
* If no File or File_redirect record is present, the URL is hit and any
* redirects are followed, up to 10 levels or until a protected URL is
* reached.
*
* @param string $in_url
* @param boolean $discover true to attempt dereferencing the redirect if we don't know it already
* @return mixed one of:
* string - target URL, if this is a direct link or a known redirect
* array - redirect info if this is an *unknown* redirect:
* associative array with the following elements:
* code: HTTP status code
* redirects: count of redirects followed
* url: URL string of final target
* type (optional): MIME type from Content-Type header
* size (optional): byte size from Content-Length header
* time (optional): timestamp from Last-Modified header
*/
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static function where($in_url, $discover=true) {
// let's see if we know this...
try {
$a = File::getByUrl($in_url);
// this is a direct link to $a->url
return $a->url;
} catch (NoResultException $e) {
try {
$b = File_redirection::getByUrl($in_url);
// this is a redirect to $b->file_id
$a = File::getByID($b->file_id);
return $a->url;
} catch (NoResultException $e) {
// Oh well, let's keep going
}
}
if ($discover) {
$ret = File_redirection::lookupWhere($in_url);
return $ret;
}
// No manual dereferencing; leave the unknown URL as is.
return $in_url;
}
/**
* Shorten a URL with the current user's configured shortening
* options, if applicable.
*
* If it cannot be shortened or the "short" URL is longer than the
* original, the original is returned.
*
* If the referenced item has not been seen before, embedding data
* may be saved.
*
* @param string $long_url
* @param User $user whose shortening options to use; defaults to the current web session user
* @return string
*/
function makeShort($long_url, $user=null)
Give users more control over URL shortening Users and administrators can set how long an URL can be before it's shortened, and how long a notice can be before all its URLs are shortened. They can also turn off shortening altogether. Squashed commit of the following: commit d136b390115829c4391b3666bb1967f190a0de35 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:39:00 2010 -0400 use site and user settings to determine when to shorten URLs commit 1e1c851ff3cb2da5e0dc3a0b06239a9d9c618488 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:38:40 2010 -0400 add a method to force shortening URLs commit 4d29ca0b91201f6df42940297ed5b64b070efe49 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:41 2010 -0400 static method for getting best URL shortening service commit a9c6a3bace0af44bcf38d1c790425a7be9c72147 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:11 2010 -0400 allow 0 in numeric entries in othersettings commit 767ff2f7ecfd7e76e8418fc79d45e61898f09382 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:36:46 2010 -0400 allow 0 or blank string in inputs commit 1e21af42a685f600f4a53f49a194013e78b12f20 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:01:11 2010 -0400 add more URL-shortening options to othersettings commit 869a6be0f5779aff69018d02f9ac0273946040d9 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:22:51 2010 -0400 move url shortener superclass to lib from plugin commit 9c0c9863d532942b99184f14e923fc3c050f8177 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:20:28 2010 -0400 documentation and whitespace on UrlShortenerPlugin commit 7a1dd5798f0fcf2c03d1257a18ddcb9008879de0 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:05:46 2010 -0400 add defaults for URL shortening commit d259c37ad231ca0010c60e5cfd397bb1732874a4 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 13:40:10 2010 -0400 Add User_urlshortener_prefs Add a table for URL shortener prefs, a corresponding class, and the correct mumbo-jumbo in statusnet.ini to make everything work.
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{
$canon = File_redirection::_canonUrl($long_url);
$short_url = File_redirection::_userMakeShort($canon, $user);
// Did we get one? Is it shorter?
Give users more control over URL shortening Users and administrators can set how long an URL can be before it's shortened, and how long a notice can be before all its URLs are shortened. They can also turn off shortening altogether. Squashed commit of the following: commit d136b390115829c4391b3666bb1967f190a0de35 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:39:00 2010 -0400 use site and user settings to determine when to shorten URLs commit 1e1c851ff3cb2da5e0dc3a0b06239a9d9c618488 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:38:40 2010 -0400 add a method to force shortening URLs commit 4d29ca0b91201f6df42940297ed5b64b070efe49 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:41 2010 -0400 static method for getting best URL shortening service commit a9c6a3bace0af44bcf38d1c790425a7be9c72147 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:11 2010 -0400 allow 0 in numeric entries in othersettings commit 767ff2f7ecfd7e76e8418fc79d45e61898f09382 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:36:46 2010 -0400 allow 0 or blank string in inputs commit 1e21af42a685f600f4a53f49a194013e78b12f20 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:01:11 2010 -0400 add more URL-shortening options to othersettings commit 869a6be0f5779aff69018d02f9ac0273946040d9 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:22:51 2010 -0400 move url shortener superclass to lib from plugin commit 9c0c9863d532942b99184f14e923fc3c050f8177 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:20:28 2010 -0400 documentation and whitespace on UrlShortenerPlugin commit 7a1dd5798f0fcf2c03d1257a18ddcb9008879de0 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:05:46 2010 -0400 add defaults for URL shortening commit d259c37ad231ca0010c60e5cfd397bb1732874a4 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 13:40:10 2010 -0400 Add User_urlshortener_prefs Add a table for URL shortener prefs, a corresponding class, and the correct mumbo-jumbo in statusnet.ini to make everything work.
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if (!empty($short_url)) {
return $short_url;
} else {
return $long_url;
}
}
/**
* Shorten a URL with the current user's configured shortening
* options, if applicable.
*
* If it cannot be shortened or the "short" URL is longer than the
* original, the original is returned.
*
* If the referenced item has not been seen before, embedding data
* may be saved.
*
* @param string $long_url
* @return string
*/
function forceShort($long_url, $user)
Give users more control over URL shortening Users and administrators can set how long an URL can be before it's shortened, and how long a notice can be before all its URLs are shortened. They can also turn off shortening altogether. Squashed commit of the following: commit d136b390115829c4391b3666bb1967f190a0de35 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:39:00 2010 -0400 use site and user settings to determine when to shorten URLs commit 1e1c851ff3cb2da5e0dc3a0b06239a9d9c618488 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:38:40 2010 -0400 add a method to force shortening URLs commit 4d29ca0b91201f6df42940297ed5b64b070efe49 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:41 2010 -0400 static method for getting best URL shortening service commit a9c6a3bace0af44bcf38d1c790425a7be9c72147 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:11 2010 -0400 allow 0 in numeric entries in othersettings commit 767ff2f7ecfd7e76e8418fc79d45e61898f09382 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:36:46 2010 -0400 allow 0 or blank string in inputs commit 1e21af42a685f600f4a53f49a194013e78b12f20 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:01:11 2010 -0400 add more URL-shortening options to othersettings commit 869a6be0f5779aff69018d02f9ac0273946040d9 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:22:51 2010 -0400 move url shortener superclass to lib from plugin commit 9c0c9863d532942b99184f14e923fc3c050f8177 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:20:28 2010 -0400 documentation and whitespace on UrlShortenerPlugin commit 7a1dd5798f0fcf2c03d1257a18ddcb9008879de0 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:05:46 2010 -0400 add defaults for URL shortening commit d259c37ad231ca0010c60e5cfd397bb1732874a4 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 13:40:10 2010 -0400 Add User_urlshortener_prefs Add a table for URL shortener prefs, a corresponding class, and the correct mumbo-jumbo in statusnet.ini to make everything work.
2010-04-26 07:40:36 +01:00
{
$canon = File_redirection::_canonUrl($long_url);
$short_url = File_redirection::_userMakeShort($canon, $user, true);
Give users more control over URL shortening Users and administrators can set how long an URL can be before it's shortened, and how long a notice can be before all its URLs are shortened. They can also turn off shortening altogether. Squashed commit of the following: commit d136b390115829c4391b3666bb1967f190a0de35 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:39:00 2010 -0400 use site and user settings to determine when to shorten URLs commit 1e1c851ff3cb2da5e0dc3a0b06239a9d9c618488 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:38:40 2010 -0400 add a method to force shortening URLs commit 4d29ca0b91201f6df42940297ed5b64b070efe49 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:41 2010 -0400 static method for getting best URL shortening service commit a9c6a3bace0af44bcf38d1c790425a7be9c72147 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:37:11 2010 -0400 allow 0 in numeric entries in othersettings commit 767ff2f7ecfd7e76e8418fc79d45e61898f09382 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:36:46 2010 -0400 allow 0 or blank string in inputs commit 1e21af42a685f600f4a53f49a194013e78b12f20 Author: Evan Prodromou <evan@status.net> Date: Mon Apr 26 02:01:11 2010 -0400 add more URL-shortening options to othersettings commit 869a6be0f5779aff69018d02f9ac0273946040d9 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:22:51 2010 -0400 move url shortener superclass to lib from plugin commit 9c0c9863d532942b99184f14e923fc3c050f8177 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:20:28 2010 -0400 documentation and whitespace on UrlShortenerPlugin commit 7a1dd5798f0fcf2c03d1257a18ddcb9008879de0 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 14:05:46 2010 -0400 add defaults for URL shortening commit d259c37ad231ca0010c60e5cfd397bb1732874a4 Author: Evan Prodromou <evan@status.net> Date: Sat Apr 24 13:40:10 2010 -0400 Add User_urlshortener_prefs Add a table for URL shortener prefs, a corresponding class, and the correct mumbo-jumbo in statusnet.ini to make everything work.
2010-04-26 07:40:36 +01:00
// Did we get one? Is it shorter?
if (!empty($short_url)) {
return $short_url;
} else {
return $long_url;
}
}
static function _userMakeShort($long_url, User $user=null, $force = false) {
$short_url = common_shorten_url($long_url, $user, $force);
if (!empty($short_url) && $short_url != $long_url) {
$short_url = (string)$short_url;
// store it
$file = File::getKV('url', $long_url);
if ($file instanceof File) {
$file_id = $file->getID();
} else {
// Check if the target URL is itself a redirect...
$redir_data = File_redirection::where($long_url);
if (is_array($redir_data)) {
// We haven't seen the target URL before.
// Save file and embedding data about it!
$file = File::saveNew($redir_data, $long_url);
$file_id = $file->getID();
} else if (is_string($redir_data)) {
// The file is a known redirect target.
$file = File::getKV('url', $redir_data);
if (empty($file)) {
// @fixme should we save a new one?
// this case was triggering sometimes for redirects
// with unresolvable targets; found while fixing
// "can't linkify" bugs with shortened links to
// SSL sites with cert issues.
return null;
}
$file_id = $file->getID();
}
}
$file_redir = File_redirection::getKV('url', $short_url);
if (!$file_redir instanceof File_redirection) {
$file_redir = new File_redirection;
$file_redir->urlhash = File::hashurl($short_url);
$file_redir->url = $short_url;
$file_redir->file_id = $file_id;
$file_redir->insert();
}
return $short_url;
}
return null;
}
/**
* Basic attempt to canonicalize a URL, cleaning up some standard variants
* such as funny syntax or a missing path. Used internally when cleaning
* up URLs for storage and following redirect chains.
*
* Note that despite being on File_redirect, this function DOES NOT perform
* any dereferencing of redirects.
*
* @param string $in_url input URL
* @param string $default_scheme if given a bare link; defaults to 'http://'
* @return string
*/
static function _canonUrl($in_url, $default_scheme = 'http://') {
if (empty($in_url)) return false;
$out_url = $in_url;
$p = parse_url($out_url);
if (empty($p['host']) || empty($p['scheme'])) {
list($scheme) = explode(':', $in_url, 2);
switch (strtolower($scheme)) {
case 'fax':
case 'tel':
$out_url = str_replace('.-()', '', $out_url);
break;
case 'mailto':
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case 'magnet':
case 'aim':
case 'jabber':
case 'xmpp':
// don't touch anything
break;
default:
$out_url = $default_scheme . ltrim($out_url, '/');
$p = parse_url($out_url);
if (empty($p['scheme'])) return false;
break;
}
}
if (('ftp' == $p['scheme']) || ('ftps' == $p['scheme']) || ('http' == $p['scheme']) || ('https' == $p['scheme'])) {
if (empty($p['host'])) return false;
if (empty($p['path'])) {
$out_url .= '/';
}
}
return $out_url;
}
static function saveNew($data, $file_id, $url) {
$file_redir = new File_redirection;
$file_redir->urlhash = File::hashurl($short_url);
$file_redir->url = $url;
$file_redir->file_id = $file_id;
$file_redir->redirections = intval($data['redirects']);
$file_redir->httpcode = intval($data['code']);
$file_redir->insert();
}
static public function beforeSchemaUpdate()
{
$table = strtolower(get_called_class());
$schema = Schema::get();
$schemadef = $schema->getTableDef($table);
// 2015-02-19 We have to upgrade our table definitions to have the urlhash field populated
if (isset($schemadef['fields']['urlhash']) && in_array('urlhash', $schemadef['primary key'])) {
// We already have the urlhash field, so no need to migrate it.
return;
}
echo "\nFound old $table table, upgrading it to contain 'urlhash' field...";
// We have to create a urlhash that is _not_ the primary key,
// transfer data and THEN run checkSchema
$schemadef['fields']['urlhash'] = array (
'type' => 'varchar',
'length' => 64,
'not null' => true,
'description' => 'sha256 hash of the URL',
);
$schemadef['fields']['url'] = array (
'type' => 'text',
'description' => 'short URL (or any other kind of redirect) for file (id)',
);
unset($schemadef['primary key']);
$schema->ensureTable($table, $schemadef);
echo "DONE.\n";
$classname = ucfirst($table);
$tablefix = new $classname;
// urlhash is hash('sha256', $url) in the File table
echo "Updating urlhash fields in $table table...";
// Maybe very MySQL specific :(
$tablefix->query(sprintf('UPDATE %1$s SET %2$s=%3$s;',
$schema->quoteIdentifier($table),
'urlhash',
// The line below is "result of sha256 on column `url`"
'SHA2(url, 256)'));
echo "DONE.\n";
echo "Resuming core schema upgrade...";
}
}