1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
<?php
/**
* ownCloud - News app
*
* @author Alessandro Cosentino
* Copyright (c) 2012 - Alessandro Cosentino <cosenal@gmail.com>
*
* This file is licensed under the Affero General Public License version 3 or later.
* See the COPYING-README file
*
*/
namespace OCA\News;
// load SimplePie library
//TODO: is this a suitable place for the following require?
require_once 'news/3rdparty/SimplePie/autoloader.php';
class Utils {
/**
* @brief Transform a date from UNIX timestamp format to MDB2 timestamp format
* @param dbtimestamp
* @returns
*/
public static function unixtimeToDbtimestamp($unixtime) {
$dt = \DateTime::createFromFormat('U', $unixtime);
return $dt->format('Y-m-d H:i:s');
}
/**
* @brief Transform a date from MDB2 timestamp format to UNIX timestamp format
* @param dbtimestamp
* @returns
*/
public static function dbtimestampToUnixtime($dbtimestamp) {
$dt = \DateTime::createFromFormat('Y-m-d H:i:s', $dbtimestamp);
return $dt->format('U');
}
/**
* @brief Fetch a feed from remote
* @param url remote url of the feed
* @returns an instance of OC_News_Feed
*/
public static function fetch($url) {
$spfeed = new \SimplePie_Core();
$spfeed->set_feed_url( $url );
$spfeed->enable_cache( false );
if (!$spfeed->init()) {
return null;
}
//temporary try-catch to bypass SimplePie bugs
try {
$spfeed->handle_content_type();
$title = $spfeed->get_title();
$items = array();
if ($spitems = $spfeed->get_items()) {
foreach($spitems as $spitem) {
$itemUrl = $spitem->get_permalink();
$itemTitle = $spitem->get_title();
$itemGUID = $spitem->get_id();
$itemBody = $spitem->get_content();
$item = new Item($itemUrl, $itemTitle, $itemGUID, $itemBody);
$spAuthor = $spitem->get_author();
if ($spAuthor !== null) {
$item->setAuthor($spAuthor->get_name());
}
//date in Item is stored in UNIX timestamp format
$itemDate = $spitem->get_date('U');
$item->setDate($itemDate);
$items[] = $item;
}
}
$feed = new Feed($url, $title, $items);
$favicon = $spfeed->get_image_url();
if ($favicon !== null && self::checkFavicon($favicon)) { // use favicon from feed
$feed->setFavicon($favicon);
}
else { // try really hard to find a favicon
$webFavicon = self::discoverFavicon($url);
if ($webFavicon !== null) {
$feed->setFavicon($webFavicon);
}
}
return $feed;
}
catch (Exception $e) {
return null;
}
}
/**
* Perform a "slim" fetch of a feed from remote.
* Differently from Utils::fetch(), it doesn't retrieve items nor a favicon
*
* @param url remote url of the feed
* @returns an instance of OC_News_Feed
*/
public static function slimFetch($url) {
$spfeed = new \SimplePie_Core();
$spfeed->set_feed_url( $url );
$spfeed->enable_cache( false );
$spfeed->set_stupidly_fast( true );
if (!$spfeed->init()) {
return null;
}
//temporary try-catch to bypass SimplePie bugs
try {
$title = $spfeed->get_title();
$feed = new Feed($url, $title);
return $feed;
}
catch (Exception $e) {
return null;
}
}
public static function checkFavicon($favicon) {
if ($favicon === null || $favicon == false)
return false;
$file = new \SimplePie_File($favicon);
// size in bytes
$filesize = strlen($file->body);
if($file->success && $filesize > 0 && $filesize < 50000) { //bigger files are not considered favicons
$sniffer = new \SimplePie_Content_Type_Sniffer($file);
if(substr($sniffer->get_type(), 0, 6) === 'image/') {
$imgsize = getimagesize($favicon);
if ($imgsize['0'] <= 32 && $imgsize['1'] <= 32) { //bigger images are not considered favicons
return true;
}
}
}
return false;
}
public static function discoverFavicon($url) {
//try webroot favicon
$favicon = \SimplePie_Misc::absolutize_url('/favicon.ico', $url);
if(self::checkFavicon($favicon))
return $favicon;
//try to extract favicon from web page
$absoluteUrl = \SimplePie_Misc::absolutize_url('/', $url);
$handle = \curl_init ( );
\curl_setopt ( $handle, CURLOPT_URL, $absoluteUrl );
\curl_setopt ( $handle, CURLOPT_RETURNTRANSFER, 1 );
\curl_setopt ( $handle, CURLOPT_FOLLOWLOCATION, TRUE );
\curl_setopt ( $handle, CURLOPT_MAXREDIRS, 10 );
if ( FALSE!==($page=curl_exec($handle)) ) {
preg_match ( '/<[^>]*link[^>]*(rel=["\']icon["\']|rel=["\']shortcut icon["\']) .*href=["\']([^>]*)["\'].*>/iU', $page, $match );
if (1<sizeof($match)) {
// the specified uri might be an url, an absolute or a relative path
// we have to turn it into an url to be able to display it out of context
$favicon = htmlspecialchars_decode ( $match[2] );
// test for an url
if (parse_url($favicon,PHP_URL_SCHEME)) {
if(self::checkFavicon($favicon))
return $favicon;
}
}
}
return null;
}
}
|
