/
class_http.php
408 lines (373 loc) · 14.2 KB
/
class_http.php
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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
<?php
/*
* Filename.......: class_http.php
* Author.........: Troy Wolf [troy@troywolf.com]
* Last Modified..: Date: 2006/03/06 10:15:00
* Description....: Screen-scraping class with caching. Includes image_cache.php
companion script. Includes static methods to extract data
out of HTML tables into arrays or XML. Now supports sending
XML requests and custom verbs with support for making
WebDAV requests to Microsoft Exchange Server.
*/
class http {
var $log;
var $dir;
var $name;
var $filename;
var $url;
var $port;
var $verb;
var $status;
var $header;
var $body;
var $ttl;
var $headers;
var $postvars;
var $xmlrequest;
var $connect_timeout;
var $data_ts;
/*
The class constructor. Configure defaults.
*/
function http() {
$this->log = "New http() object instantiated.<br />\n";
/*
Seconds to attempt socket connection before giving up.
*/
$this->connect_timeout = 30;
/*
Set the 'dir' property to the directory where you want to store the cached
content. I suggest a folder that is not web-accessible.
End this value with a "/".
*/
$this->dir = realpath("./")."/"; //Default to current dir.
$this->clean();
return true;
}
/*
fetch() method to get the content. fetch() will use 'ttl' property to
determine whether to get the content from the url or the cache.
*/
function fetch($url="", $ttl=0, $name="", $user="", $pwd="", $verb="GET") {
$this->log .= "--------------------------------<br />fetch() called<br />\n";
$this->log .= "url: ".$url."<br />\n";
$this->status = "";
$this->header = "";
$this->body = "";
if (!$url) {
$this->log .= "OOPS: You need to pass a URL!<br />";
return false;
}
$this->url = $url;
$this->ttl = $ttl;
$this->name = $name;
$need_to_save = false;
if ($this->ttl == "0") {
if (!$fh = $this->getFromUrl($url, $user, $pwd, $verb)) {
return false;
}
} else {
if (strlen(trim($this->name)) == 0) { $this->name = MD5($url); }
$this->filename = $this->dir."http_".$this->name;
$this->log .= "Filename: ".$this->filename."<br />";
$this->getFile_ts();
if ($this->ttl == "daily") {
if (date('Y-m-d',$this->data_ts) != date('Y-m-d',time())) {
$this->log .= "cache has expired<br />";
if (!$fh = $this->getFromUrl($url, $user, $pwd, $verb)) {
return false;
}
$need_to_save = true;
if ($this->getFromUrl()) { return $this->saveToCache(); }
} else {
if (!$fh = $this->getFromCache()) {
return false;
}
}
} else {
if ((time() - $this->data_ts) >= $this->ttl) {
$this->log .= "cache has expired<br />";
if (!$fh = $this->getFromUrl($url, $user, $pwd)) {
return false;
}
$need_to_save = true;
} else {
if (!$fh = $this->getFromCache()) {
return false;
}
}
}
}
/*
Get response header.
*/
$this->header = fgets($fh, 1024);
$this->status = substr($this->header,9,3);
while ((trim($line = fgets($fh, 1024)) != "") && (!feof($fh))) {
$this->header .= $line;
if ($this->status=="401" and strpos($line,"WWW-Authenticate: Basic realm=\"")===0) {
fclose($fh);
$this->log .= "Could not authenticate<br />\n";
return FALSE;
}
}
/*
Get response body.
*/
while (!feof($fh)) {
$this->body .= fgets($fh, 1024);
}
fclose($fh);
if ($need_to_save) { $this->saveToCache(); }
return $this->status;
}
/*
PRIVATE getFromUrl() method to scrape content from url.
*/
function getFromUrl($url, $user="", $pwd="", $verb="GET") {
$this->log .= "getFromUrl() called<br />";
preg_match("~([a-z]*://)?([^:^/]*)(:([0-9]{1,5}))?(/.*)?~i", $url, $parts);
$protocol = $parts[1];
$server = $parts[2];
$port = $parts[4];
$path = $parts[5];
if ($port == "") {
if (strtolower($protocol) == "https://") {
$port = "443";
} else {
$port = "80";
}
}
if ($path == "") { $path = "/"; }
if (!$sock = @fsockopen(((strtolower($protocol) == "https://")?"ssl://":"").$server, $port, $errno, $errstr, $this->connect_timeout)) {
$this->log .= "Could not open connection. Error "
.$errno.": ".$errstr."<br />\n";
return false;
}
$this->headers["Host"] = $server.":".$port;
if ($user != "" && $pwd != "") {
$this->log .= "Authentication will be attempted<br />\n";
$this->headers["Authorization"] = "Basic ".base64_encode($user.":".$pwd);
}
if (count($this->postvars) > 0) {
$this->log .= "Variables will be POSTed<br />\n";
$request = "POST ".$path." HTTP/1.0\r\n";
$post_string = "";
foreach ($this->postvars as $key=>$value) {
$post_string .= "&".urlencode($key)."=".urlencode($value);
}
$post_string = substr($post_string,1);
$this->headers["Content-Type"] = "application/x-www-form-urlencoded";
$this->headers["Content-Length"] = strlen($post_string);
} elseif (strlen($this->xmlrequest) > 0) {
$this->log .= "XML request will be sent<br />\n";
$request = $verb." ".$path." HTTP/1.0\r\n";
$this->headers["Content-Length"] = strlen($this->xmlrequest);
} else {
$request = $verb." ".$path." HTTP/1.0\r\n";
}
#echo "<br />request: ".$request;
if (fwrite($sock, $request) === FALSE) {
fclose($sock);
$this->log .= "Error writing request type to socket<br />\n";
return false;
}
foreach ($this->headers as $key=>$value) {
if (fwrite($sock, $key.": ".$value."\r\n") === FALSE) {
fclose($sock);
$this->log .= "Error writing headers to socket<br />\n";
return false;
}
}
if (fwrite($sock, "\r\n") === FALSE) {
fclose($sock);
$this->log .= "Error writing end-of-line to socket<br />\n";
return false;
}
#echo "<br />post_string: ".$post_string;
if (count($this->postvars) > 0) {
if (fwrite($sock, $post_string."\r\n") === FALSE) {
fclose($sock);
$this->log .= "Error writing POST string to socket<br />\n";
return false;
}
} elseif (strlen($this->xmlrequest) > 0) {
if (fwrite($sock, $this->xmlrequest."\r\n") === FALSE) {
fclose($sock);
$this->log .= "Error writing xml request string to socket<br />\n";
return false;
}
}
return $sock;
}
/*
PRIVATE clean() method to reset the instance back to mostly new state.
*/
function clean()
{
$this->status = "";
$this->header = "";
$this->body = "";
$this->headers = array();
$this->postvars = array();
/*
Try to use user agent of the user making this request. If not available,
default to IE6.0 on WinXP, SP1.
*/
if (isset($_SERVER['HTTP_USER_AGENT'])) {
$this->headers["User-Agent"] = $_SERVER['HTTP_USER_AGENT'];
} else {
$this->headers["User-Agent"] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)";
}
/*
Set referrer to the current script since in essence, it is the referring
page.
*/
if (substr($_SERVER['SERVER_PROTOCOL'],0,5) == "HTTPS") {
$this->headers["Referer"] = "https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
} else {
$this->headers["Referer"] = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
}
}
/*
PRIVATE getFromCache() method to retrieve content from cache file.
*/
function getFromCache() {
$this->log .= "getFromCache() called<br />";
//create file pointer
if (!$fp=@fopen($this->filename,"r")) {
$this->log .= "Could not open ".$this->filename."<br />";
return false;
}
return $fp;
}
/*
PRIVATE saveToCache() method to save content to cache file.
*/
function saveToCache() {
$this->log .= "saveToCache() called<br />";
//create file pointer
if (!$fp=@fopen($this->filename,"w")) {
$this->log .= "Could not open ".$this->filename."<br />";
return false;
}
//write to file
if (!@fwrite($fp,$this->header."\r\n".$this->body)) {
$this->log .= "Could not write to ".$this->filename."<br />";
fclose($fp);
return false;
}
//close file pointer
fclose($fp);
return true;
}
/*
PRIVATE getFile_ts() method to get cache file modified date.
*/
function getFile_ts() {
$this->log .= "getFile_ts() called<br />";
if (!file_exists($this->filename)) {
$this->data_ts = 0;
$this->log .= $this->filename." does not exist<br />";
return false;
}
$this->data_ts = filemtime($this->filename);
return true;
}
/*
Static method table_into_array()
Generic function to return data array from HTML table data
rawHTML: the page source
needle: optional string to start parsing source from
needle_within: 0 = needle is BEFORE table, 1 = needle is within table
allowed_tags: list of tags to NOT strip from data, e.g. "<a><b>"
*/
function table_into_array($rawHTML,$needle="",$needle_within=0,$allowed_tags="") {
$upperHTML = strtoupper($rawHTML);
$idx = 0;
if (strlen($needle) > 0) {
$needle = strtoupper($needle);
$idx = strpos($upperHTML,$needle);
if ($idx === false) { return false; }
if ($needle_within == 1) {
$cnt = 0;
while(($cnt < 100) && (substr($upperHTML,$idx,6) != "<TABLE")) {
$idx = strrpos(substr($upperHTML,0,$idx-1),"<");
$cnt++;
}
}
}
$aryData = array();
$rowIdx = 0;
/* If this table has a header row, it may use TD or TH, so
check special for this first row. */
$tmp = strpos($upperHTML,"<TR",$idx);
if ($tmp === false) { return false; }
$tmp2 = strpos($upperHTML,"</TR>",$tmp);
if ($tmp2 === false) { return false; }
$row = substr($rawHTML,$tmp,$tmp2-$tmp);
$pattern = "/<TH>|<TH\ |<TD>|<TD\ /";
preg_match($pattern,strtoupper($row),$matches);
$hdrTag = $matches[0];
while ($tmp = strpos(strtoupper($row),$hdrTag) !== false) {
$tmp = strpos(strtoupper($row),">",$tmp);
if ($tmp === false) { return false; }
$tmp++;
$tmp2 = strpos(strtoupper($row),"</T");
$aryData[$rowIdx][] = trim(strip_tags(substr($row,$tmp,$tmp2-$tmp),$allowed_tags));
$row = substr($row,$tmp2+5);
preg_match($pattern,strtoupper($row),$matches);
$hdrTag = $matches[0];
}
$idx = strpos($upperHTML,"</TR>",$idx)+5;
$rowIdx++;
/* Now parse the rest of the rows. */
$tmp = strpos($upperHTML,"<TR",$idx);
if ($tmp === false) { return false; }
$tmp2 = strpos($upperHTML,"</TABLE>",$idx);
if ($tmp2 === false) { return false; }
$table = substr($rawHTML,$tmp,$tmp2-$tmp);
while ($tmp = strpos(strtoupper($table),"<TR") !== false) {
$tmp2 = strpos(strtoupper($table),"</TR");
if ($tmp2 === false) { return false; }
$row = substr($table,$tmp,$tmp2-$tmp);
while ($tmp = strpos(strtoupper($row),"<TD") !== false) {
$tmp = strpos(strtoupper($row),">",$tmp);
if ($tmp === false) { return false; }
$tmp++;
$tmp2 = strpos(strtoupper($row),"</TD");
$aryData[$rowIdx][] = trim(strip_tags(substr($row,$tmp,$tmp2-$tmp),$allowed_tags));
$row = substr($row,$tmp2+5);
}
$table = substr($table,strpos(strtoupper($table),"</TR>")+5);
$rowIdx++;
}
return $aryData;
}
/*
Static method table_into_xml()
Generic function to return xml dataset from HTML table data
rawHTML: the page source
needle: optional string to start parsing source from
allowedTags: list of tags to NOT strip from data, e.g. "<a><b>"
*/
function table_into_xml($rawHTML,$needle="",$needle_within=0,$allowedTags="") {
if (!$aryTable = http::table_into_array($rawHTML,$needle,$needle_within,$allowedTags)) { return false; }
$xml = "<?xml version=\"1.0\" standalone=\"yes\" \?\>\n";
$xml .= "<TABLE>\n";
$rowIdx = 0;
foreach ($aryTable as $row) {
$xml .= "\t<ROW id=\"".$rowIdx."\">\n";
$colIdx = 0;
foreach ($row as $col) {
$xml .= "\t\t<COL id=\"".$colIdx."\">".trim(utf8_encode(htmlspecialchars($col)))."</COL>\n";
$colIdx++;
}
$xml .= "\t</ROW>\n";
$rowIdx++;
}
$xml .= "</TABLE>";
return $xml;
}
}
?>