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1 | <?php |
2 | /** | |
3 | * SimplePie | |
4 | * | |
5 | * A PHP-Based RSS and Atom Feed Framework. | |
6 | * Takes the hard work out of managing a complete RSS/Atom solution. | |
7 | * | |
8 | * Copyright (c) 2004-2009, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without modification, are | |
12 | * permitted provided that the following conditions are met: | |
13 | * | |
14 | * * Redistributions of source code must retain the above copyright notice, this list of | |
15 | * conditions and the following disclaimer. | |
16 | * | |
17 | * * Redistributions in binary form must reproduce the above copyright notice, this list | |
18 | * of conditions and the following disclaimer in the documentation and/or other materials | |
19 | * provided with the distribution. | |
20 | * | |
21 | * * Neither the name of the SimplePie Team nor the names of its contributors may be used | |
22 | * to endorse or promote products derived from this software without specific prior | |
23 | * written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS | |
26 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | |
27 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS | |
28 | * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
30 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
32 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
33 | * POSSIBILITY OF SUCH DAMAGE. | |
34 | * | |
35 | * @package SimplePie | |
36 | * @version 1.3-dev | |
37 | * @copyright 2004-2010 Ryan Parman, Geoffrey Sneddon, Ryan McCue | |
38 | * @author Ryan Parman | |
39 | * @author Geoffrey Sneddon | |
40 | * @author Ryan McCue | |
41 | * @link http://simplepie.org/ SimplePie | |
42 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License | |
43 | * @todo phpDoc comments | |
44 | */ | |
45 | ||
46 | ||
47 | /** | |
48 | * Content-type sniffing | |
49 | * | |
50 | * Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06 | |
51 | * @package SimplePie | |
52 | */ | |
53 | class SimplePie_Content_Type_Sniffer | |
54 | { | |
55 | /** | |
56 | * File object | |
57 | * | |
58 | * @var SimplePie_File | |
59 | */ | |
60 | var $file; | |
61 | ||
62 | /** | |
63 | * Create an instance of the class with the input file | |
64 | * | |
65 | * @param SimplePie_Content_Type_Sniffer $file Input file | |
66 | */ | |
67 | public function __construct($file) | |
68 | { | |
69 | $this->file = $file; | |
70 | } | |
71 | ||
72 | /** | |
73 | * Get the Content-Type of the specified file | |
74 | * | |
75 | * @return string Actual Content-Type | |
76 | */ | |
77 | public function get_type() | |
78 | { | |
79 | if (isset($this->file->headers['content-type'])) | |
80 | { | |
81 | if (!isset($this->file->headers['content-encoding']) | |
82 | && ($this->file->headers['content-type'] === 'text/plain' | |
83 | || $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1' | |
84 | || $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1' | |
85 | || $this->file->headers['content-type'] === 'text/plain; charset=UTF-8')) | |
86 | { | |
87 | return $this->text_or_binary(); | |
88 | } | |
89 | ||
90 | if (($pos = strpos($this->file->headers['content-type'], ';')) !== false) | |
91 | { | |
92 | $official = substr($this->file->headers['content-type'], 0, $pos); | |
93 | } | |
94 | else | |
95 | { | |
96 | $official = $this->file->headers['content-type']; | |
97 | } | |
98 | $official = trim(strtolower($official)); | |
99 | ||
100 | if ($official === 'unknown/unknown' | |
101 | || $official === 'application/unknown') | |
102 | { | |
103 | return $this->unknown(); | |
104 | } | |
105 | elseif (substr($official, -4) === '+xml' | |
106 | || $official === 'text/xml' | |
107 | || $official === 'application/xml') | |
108 | { | |
109 | return $official; | |
110 | } | |
111 | elseif (substr($official, 0, 6) === 'image/') | |
112 | { | |
113 | if ($return = $this->image()) | |
114 | { | |
115 | return $return; | |
116 | } | |
117 | else | |
118 | { | |
119 | return $official; | |
120 | } | |
121 | } | |
122 | elseif ($official === 'text/html') | |
123 | { | |
124 | return $this->feed_or_html(); | |
125 | } | |
126 | else | |
127 | { | |
128 | return $official; | |
129 | } | |
130 | } | |
131 | else | |
132 | { | |
133 | return $this->unknown(); | |
134 | } | |
135 | } | |
136 | ||
137 | /** | |
138 | * Sniff text or binary | |
139 | * | |
140 | * @return string Actual Content-Type | |
141 | */ | |
142 | public function text_or_binary() | |
143 | { | |
144 | if (substr($this->file->body, 0, 2) === "\xFE\xFF" | |
145 | || substr($this->file->body, 0, 2) === "\xFF\xFE" | |
146 | || substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF" | |
147 | || substr($this->file->body, 0, 3) === "\xEF\xBB\xBF") | |
148 | { | |
149 | return 'text/plain'; | |
150 | } | |
151 | elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body)) | |
152 | { | |
153 | return 'application/octect-stream'; | |
154 | } | |
155 | else | |
156 | { | |
157 | return 'text/plain'; | |
158 | } | |
159 | } | |
160 | ||
161 | /** | |
162 | * Sniff unknown | |
163 | * | |
164 | * @return string Actual Content-Type | |
165 | */ | |
166 | public function unknown() | |
167 | { | |
168 | $ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20"); | |
169 | if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html' | |
170 | || strtolower(substr($this->file->body, $ws, 5)) === '<html' | |
171 | || strtolower(substr($this->file->body, $ws, 7)) === '<script') | |
172 | { | |
173 | return 'text/html'; | |
174 | } | |
175 | elseif (substr($this->file->body, 0, 5) === '%PDF-') | |
176 | { | |
177 | return 'application/pdf'; | |
178 | } | |
179 | elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-') | |
180 | { | |
181 | return 'application/postscript'; | |
182 | } | |
183 | elseif (substr($this->file->body, 0, 6) === 'GIF87a' | |
184 | || substr($this->file->body, 0, 6) === 'GIF89a') | |
185 | { | |
186 | return 'image/gif'; | |
187 | } | |
188 | elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") | |
189 | { | |
190 | return 'image/png'; | |
191 | } | |
192 | elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") | |
193 | { | |
194 | return 'image/jpeg'; | |
195 | } | |
196 | elseif (substr($this->file->body, 0, 2) === "\x42\x4D") | |
197 | { | |
198 | return 'image/bmp'; | |
199 | } | |
200 | elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") | |
201 | { | |
202 | return 'image/vnd.microsoft.icon'; | |
203 | } | |
204 | else | |
205 | { | |
206 | return $this->text_or_binary(); | |
207 | } | |
208 | } | |
209 | ||
210 | /** | |
211 | * Sniff images | |
212 | * | |
213 | * @return string Actual Content-Type | |
214 | */ | |
215 | public function image() | |
216 | { | |
217 | if (substr($this->file->body, 0, 6) === 'GIF87a' | |
218 | || substr($this->file->body, 0, 6) === 'GIF89a') | |
219 | { | |
220 | return 'image/gif'; | |
221 | } | |
222 | elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") | |
223 | { | |
224 | return 'image/png'; | |
225 | } | |
226 | elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") | |
227 | { | |
228 | return 'image/jpeg'; | |
229 | } | |
230 | elseif (substr($this->file->body, 0, 2) === "\x42\x4D") | |
231 | { | |
232 | return 'image/bmp'; | |
233 | } | |
234 | elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") | |
235 | { | |
236 | return 'image/vnd.microsoft.icon'; | |
237 | } | |
238 | else | |
239 | { | |
240 | return false; | |
241 | } | |
242 | } | |
243 | ||
244 | /** | |
245 | * Sniff HTML | |
246 | * | |
247 | * @return string Actual Content-Type | |
248 | */ | |
249 | public function feed_or_html() | |
250 | { | |
251 | $len = strlen($this->file->body); | |
252 | $pos = strspn($this->file->body, "\x09\x0A\x0D\x20"); | |
253 | ||
254 | while ($pos < $len) | |
255 | { | |
256 | switch ($this->file->body[$pos]) | |
257 | { | |
258 | case "\x09": | |
259 | case "\x0A": | |
260 | case "\x0D": | |
261 | case "\x20": | |
262 | $pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos); | |
263 | continue 2; | |
264 | ||
265 | case '<': | |
266 | $pos++; | |
267 | break; | |
268 | ||
269 | default: | |
270 | return 'text/html'; | |
271 | } | |
272 | ||
273 | if (substr($this->file->body, $pos, 3) === '!--') | |
274 | { | |
275 | $pos += 3; | |
276 | if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false) | |
277 | { | |
278 | $pos += 3; | |
279 | } | |
280 | else | |
281 | { | |
282 | return 'text/html'; | |
283 | } | |
284 | } | |
285 | elseif (substr($this->file->body, $pos, 1) === '!') | |
286 | { | |
287 | if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false) | |
288 | { | |
289 | $pos++; | |
290 | } | |
291 | else | |
292 | { | |
293 | return 'text/html'; | |
294 | } | |
295 | } | |
296 | elseif (substr($this->file->body, $pos, 1) === '?') | |
297 | { | |
298 | if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false) | |
299 | { | |
300 | $pos += 2; | |
301 | } | |
302 | else | |
303 | { | |
304 | return 'text/html'; | |
305 | } | |
306 | } | |
307 | elseif (substr($this->file->body, $pos, 3) === 'rss' | |
308 | || substr($this->file->body, $pos, 7) === 'rdf:RDF') | |
309 | { | |
310 | return 'application/rss+xml'; | |
311 | } | |
312 | elseif (substr($this->file->body, $pos, 4) === 'feed') | |
313 | { | |
314 | return 'application/atom+xml'; | |
315 | } | |
316 | else | |
317 | { | |
318 | return 'text/html'; | |
319 | } | |
320 | } | |
321 | ||
322 | return 'text/html'; | |
323 | } | |
324 | } | |
325 |