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moodle/lib/libcurlemu/libcurlnative.inc.php

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<?php
/* CURL Extension Emulation Library (Native PHP)
* Copyright 2004-2005, Steve Blinch
* http://code.blitzaffe.com
* ============================================================================
*
* DESCRIPTION
*
* Provides a pure-PHP implementation of the PHP CURL extension, for use on
* systems which do not already have the CURL extension installed. It emulates
* all of the curl_* functions normally provided by the CURL extension itself,
* and uses an internal, native-PHP HTTP library to make requests.
*
* This library will automatically detect whether or not the "real" CURL
* extension is installed, and if so, it will not interfere. Thus, it can be
* used to ensure that, one way or another, the CURL functions are available
* for use.
*
* Note that this is only a *rough* emulation of CURL; it is not exact, and
* many of CURL's options are not implemented. For a more precise emulation of
* CURL, you may want to try our other libcurlexternal library which is based on
* the CURL console binary (and is virtually identical to the CURL extension).
*
*
* USAGE
*
* Please see the PHP documentation under the "CURL, Client URL Library
* Functions" section for information about using this library. Almost all of
* the documentation and examples in the PHP manual should work with this
* library.
*
*
* LICENSE
*
* This script is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This script 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with this script; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// if the real CURL PHP extension is installed, exit without doing anything;
// if libcurlemu is installed and providing a wrapper for the CURL binary,
// exit without doing anything
if (!extension_loaded("curl") && !function_exists("curl_init")) {
// if the CURL binary was not found, do one of the following:
// - if CURLNAT_MISSING_ABORT was defined, then exit without
// implementing the CURL functions
// - otherwise, raise a fatal error and halt the script
if (!class_exists("HTTPRetriever")) {
if (is_readable(dirname(__FILE__)."/class_HTTPRetriever.php")) {
define("HTTPR_NO_REDECLARE_CURL",true);
require_once(dirname(__FILE__)."/class_HTTPRetriever.php");
} else {
if (defined("CURLNAT_MISSING_ABORT") && CURLNAT_MISSING_ABORT) {
return;
} else {
trigger_error("CURL extension is not loaded, libcurlemu is not loaded, and the HTTPRetriever class is unavailable",E_USER_ERROR);
}
}
}
define("CURLNAT_VERSION","1.0.0");
define('CURLOPT_NOTHING',0);
define('CURLOPT_FILE',10001);
define('CURLOPT_URL',10002);
define('CURLOPT_PORT',3);
define('CURLOPT_PROXY',10004);
define('CURLOPT_USERPWD',10005);
define('CURLOPT_PROXYUSERPWD',10006);
define('CURLOPT_RANGE',10007);
define('CURLOPT_INFILE',10009);
define('CURLOPT_ERRORBUFFER',10010);
define('CURLOPT_WRITEFUNCTION',20011);
define('CURLOPT_READFUNCTION',20012);
define('CURLOPT_TIMEOUT',13);
define('CURLOPT_INFILESIZE',14);
define('CURLOPT_POSTFIELDS',10015);
define('CURLOPT_REFERER',10016);
define('CURLOPT_FTPPORT',10017);
define('CURLOPT_USERAGENT',10018);
define('CURLOPT_LOW_SPEED_LIMIT',19);
define('CURLOPT_LOW_SPEED_TIME',20);
define('CURLOPT_RESUME_FROM',21);
define('CURLOPT_COOKIE',10022);
define('CURLOPT_HTTPHEADER',10023);
define('CURLOPT_HTTPPOST',10024);
define('CURLOPT_SSLCERT',10025);
define('CURLOPT_SSLCERTPASSWD',10026);
define('CURLOPT_SSLKEYPASSWD',10026);
define('CURLOPT_CRLF',27);
define('CURLOPT_QUOTE',10028);
define('CURLOPT_WRITEHEADER',10029);
define('CURLOPT_COOKIEFILE',10031);
define('CURLOPT_SSLVERSION',32);
define('CURLOPT_TIMECONDITION',33);
define('CURLOPT_TIMEVALUE',34);
define('CURLOPT_HTTPREQUEST',10035);
define('CURLOPT_CUSTOMREQUEST',10036);
define('CURLOPT_STDERR',10037);
define('CURLOPT_POSTQUOTE',10039);
define('CURLOPT_WRITEINFO',10040);
define('CURLOPT_VERBOSE',41);
define('CURLOPT_HEADER',42);
define('CURLOPT_NOPROGRESS',43);
define('CURLOPT_NOBODY',44);
define('CURLOPT_FAILONERROR',45);
define('CURLOPT_UPLOAD',46);
define('CURLOPT_POST',47);
define('CURLOPT_FTPLISTONLY',48);
define('CURLOPT_FTPAPPEND',50);
define('CURLOPT_NETRC',51);
define('CURLOPT_FOLLOWLOCATION',52);
define('CURLOPT_FTPASCII',53);
define('CURLOPT_TRANSFERTEXT',53);
define('CURLOPT_PUT',54);
define('CURLOPT_MUTE',55);
define('CURLOPT_PROGRESSFUNCTION',20056);
define('CURLOPT_PROGRESSDATA',10057);
define('CURLOPT_AUTOREFERER',58);
define('CURLOPT_PROXYPORT',59);
define('CURLOPT_POSTFIELDSIZE',60);
define('CURLOPT_HTTPPROXYTUNNEL',61);
define('CURLOPT_INTERFACE',10062);
define('CURLOPT_KRB4LEVEL',10063);
define('CURLOPT_SSL_VERIFYPEER',64);
define('CURLOPT_CAINFO',10065);
define('CURLOPT_PASSWDFUNCTION',20066);
define('CURLOPT_PASSWDDATA',10067);
define('CURLOPT_MAXREDIRS',68);
define('CURLOPT_FILETIME',10069);
define('CURLOPT_TELNETOPTIONS',10070);
define('CURLOPT_MAXCONNECTS',71);
define('CURLOPT_CLOSEPOLICY',72);
define('CURLOPT_CLOSEFUNCTION',20073);
define('CURLOPT_FRESH_CONNECT',74);
define('CURLOPT_FORBID_REUSE',75);
define('CURLOPT_RANDOM_FILE',10076);
define('CURLOPT_EGDSOCKET',10077);
define('CURLOPT_CONNECTTIMEOUT',78);
define('CURLOPT_HEADERFUNCTION',20079);
define('CURLOPT_HTTPGET',80);
define('CURLOPT_SSL_VERIFYHOST',81);
define('CURLOPT_COOKIEJAR',10082);
define('CURLOPT_SSL_CIPHER_LIST',10083);
define('CURLOPT_HTTP_VERSION',84);
define('CURLOPT_FTP_USE_EPSV',85);
define('CURLOPT_SSLCERTTYPE',10086);
define('CURLOPT_SSLKEY',10087);
define('CURLOPT_SSLKEYTYPE',10088);
define('CURLOPT_SSLENGINE',10089);
define('CURLOPT_SSLENGINE_DEFAULT',90);
define('CURLOPT_DNS_USE_GLOBAL_CACHE',91);
define('CURLOPT_DNS_CACHE_TIMEOUT',92);
define('CURLOPT_PREQUOTE',10093);
define('CURLOPT_RETURNTRANSFER', 19913);//moodlefix
define('CURLINFO_EFFECTIVE_URL',1);
define('CURLINFO_HTTP_CODE',2);
define('CURLINFO_FILETIME',14);
define('CURLINFO_TOTAL_TIME',3);
define('CURLINFO_NAMELOOKUP_TIME',4);
define('CURLINFO_CONNECT_TIME',5);
define('CURLINFO_PRETRANSFER_TIME',6);
define('CURLINFO_STARTTRANSFER_TIME',17);
define('CURLINFO_REDIRECT_TIME',19);
define('CURLINFO_REDIRECT_COUNT',20);
define('CURLINFO_SIZE_UPLOAD',7);
define('CURLINFO_SIZE_DOWNLOAD',8);
define('CURLINFO_SPEED_DOWNLOAD',9);
define('CURLINFO_SPEED_UPLOAD',10);
define('CURLINFO_HEADER_SIZE',11);
define('CURLINFO_REQUEST_SIZE',12);
define('CURLINFO_SSL_VERIFYRESULT',13);
define('CURLINFO_CONTENT_LENGTH_DOWNLOAD',15);
define('CURLINFO_CONTENT_LENGTH_UPLOAD',16);
define('CURLINFO_CONTENT_TYPE',18);
define("TIMECOND_ISUNMODSINCE",1);
define("TIMECOND_IFMODSINCE",2);
function _curlopt_name($curlopt) {
foreach (get_defined_constants() as $k=>$v) {
if ( (substr($k,0,8)=="CURLOPT_") && ($v==$curlopt)) return $k;
}
return false;
}
// Initialize a CURL emulation session
function curl_init($url=false) {
if(!isset($GLOBALS["_CURLNAT_OPT"])) {//moodlefix
$GLOBALS["_CURLNAT_OPT"] = array();//moodlefix
$GLOBALS["_CURLNAT_OPT"]["index"] = 0;//moodlefix
}//moodlefix
$i = $GLOBALS["_CURLNAT_OPT"]["index"]++;
$GLOBALS["_CURLNAT_OPT"][$i] = array("url"=>$url, "fail_on_error"=>false);//moodlefix
$GLOBALS["_CURLNAT_OPT"][$i]["http"] = &new HTTPRetriever();
$GLOBALS["_CURLNAT_OPT"][$i]["include_body"] = true;
$GLOBALS["_CURLNAT_OPT"][$i]["args"] = array();//moodlefix
$GLOBALS["_CURLNAT_OPT"][$i]["settings"] = array();//moodlefix
return $i;
}
// Set an option for a CURL emulation transfer
function curl_setopt($ch,$option,$value) {
$opt = &$GLOBALS["_CURLNAT_OPT"][$ch];
$args = &$opt["args"];
$settings = &$opt["settings"];
$http = &$opt["http"];
switch($option) {
case CURLOPT_URL:
$opt["url"] = $value;
break;
case CURLOPT_CUSTOMREQUEST:
$opt["method"] = $value;
break;
case CURLOPT_REFERER:
$http->headers["Referer"] = $value;
break;
case CURLOPT_NOBODY:
$opt["include_body"] = $value==0;
break;
case CURLOPT_FAILONERROR:
$opt["fail_on_error"] = $value>0;
break;
case CURLOPT_USERAGENT:
$http->headers["User-Agent"] = $value;
break;
case CURLOPT_HEADER:
$opt["include_headers"] = $value>0;
break;
case CURLOPT_RETURNTRANSFER:
$opt["return_transfer"] = $value>0;
break;
case CURLOPT_TIMEOUT:
$opt["max-time"] = (int) $value;
break;
case CURLOPT_HTTPHEADER:
reset($value);
foreach ($value as $k=>$header) {
list($headername,$headervalue) = explode(":",$header);
$http->headers[$headername] = ltrim($headervalue);
}
break;
case CURLOPT_POST:
$opt["post"] = $value>0;
break;
case CURLOPT_POSTFIELDS:
$opt["postdata"] = $value;
break;
case CURLOPT_MUTE:
// we're already mute, no?
break;
case CURLOPT_FILE:
if (is_resource($value)) {
$opt["output_handle"] = $value;
} else {
trigger_error("CURLOPT_FILE must specify a valid file resource",E_USER_WARNING);
}
break;
case CURLOPT_WRITEHEADER:
if (is_resource($value)) {
$opt["header_handle"] = $value;
} else {
trigger_error("CURLOPT_WRITEHEADER must specify a valid file resource",E_USER_WARNING);
}
break;
case CURLOPT_STDERR:
// not implemented for now - not really relevant
break;
case CURLOPT_SSL_VERIFYPEER:
case CURLOPT_SSL_VERIFYHOST:
// these are automatically disabled using ssl:// anyway
break;
case CURLOPT_USERPWD:
list($curl_user,$curl_pass) = explode(':',$value,2);
$http->auth_username = $curl_user;
$http->auth_password = $curl_pass;
break;
// Important stuff not implemented (as it's not yet supported by HTTPRetriever)
case CURLOPT_PUT:
case CURLOPT_INFILE:
case CURLOPT_FOLLOWLOCATION:
case CURLOPT_PROXYUSERPWD:
case CURLOPT_COOKIE:
case CURLOPT_COOKIEFILE:
case CURLOPT_PROXY:
case CURLOPT_RANGE:
case CURLOPT_RESUME_FROM:
// Things that cannot (reasonably) be implemented here
case CURLOPT_LOW_SPEED_LIMIT:
case CURLOPT_LOW_SPEED_TIME:
case CURLOPT_KRB4LEVEL:
case CURLOPT_SSLCERT:
case CURLOPT_SSLCERTPASSWD:
case CURLOPT_SSLVERSION:
case CURLOPT_INTERFACE:
case CURLOPT_CAINFO:
case CURLOPT_TIMECONDITION:
case CURLOPT_TIMEVALUE:
// FTP stuff not implemented
case CURLOPT_QUOTE:
case CURLOPT_POSTQUOTE:
case CURLOPT_UPLOAD:
case CURLOPT_FTPLISTONLY:
case CURLOPT_FTPAPPEND:
case CURLOPT_FTPPORT:
// Other stuff not implemented
case CURLOPT_VERBOSE:
case CURLOPT_NETRC:
default:
trigger_error("CURL emulation does not implement CURL option "._curlopt_name($option),E_USER_WARNING);
break;
}
}
// Perform a CURL emulation session
function curl_exec($ch) {
$opt = &$GLOBALS["_CURLNAT_OPT"][$ch];
$url = $opt["url"];
$http = &$opt["http"];
$http->disable_curl = true; // avoid problems with recursion, since we *ARE* CURL
$http->error = false;//moodlefix
// set time limits if requested
if (!empty($opt["max-time"])) {//moodlefix
$http->connect_timeout = $opt["max-time"];
$http->max_time = $opt["max-time"];
}
if (!empty($opt["post"])) {//moodlefix
$res = $http->post($url,$opt["postdata"]);
} elseif (!empty($opt["method"])) {
$res = $http->custom($opt["method"],$url,$opt["postdata"]);
} else {
$res = $http->get($url);
}
// check for errors
$opt["errno"] = (!$res && $http->error) ? 1 : 0;
if ($opt["errno"]) $opt["error"] = $http->error;
// die if CURLOPT_FAILONERROR is set and the HTTP result code is greater than 300
if ($opt["fail_on_error"]) {
if ($http->result_code>300) die;
}
if ($res === false) {//moodlefix
return false;//moodlefix
}//moodlefix
$opt["stats"] = $http->stats;
$headers = "";
foreach ($http->response_headers as $k=>$v) {
$headers .= "$k: $v\r\n";
}
// if a file handle was provided for header output, extract the headers
// and write them to the handle
if (isset($opt["header_handle"])) {
fwrite($opt["header_handle"],$headers);
}
$output = ($opt["include_headers"] ? $headers."\r\n" : "") . ($opt["include_body"] ? $http->response : "");
// if a file handle was provided for output, write the output to it
if (isset($opt["output_handle"])) {
fwrite($opt["output_handle"],$output);
// if the caller requested that the response be returned, return it
} elseif ($opt["return_transfer"]) {
return $output;
// otherwise, just echo the output to stdout
} else {
echo $output;
}
return true;
}
function curl_close($ch) {
$opt = &$GLOBALS["_CURLNAT_OPT"][$ch];
if ($opt["settings"]) {
$settings = &$opt["settings"];
// if the user used CURLOPT_INFILE to specify a file to upload, remove the
// temporary file created for the CURL binary
if ($settings["upload-file"]["value"] && file_exists($settings["upload-file"]["value"])) unlink($settings["upload-file"]["value"]);
}
unset($GLOBALS["_CURLNAT_OPT"][$ch]);
}
function curl_errno($ch) {
return (int) $GLOBALS["_CURLNAT_OPT"][$ch]["errno"];
}
function curl_error($ch) {
return $GLOBALS["_CURLNAT_OPT"][$ch]["error"];
}
function curl_getinfo($ch,$opt=NULL) {
if ($opt) {
$curlinfo_tags = array(
CURLINFO_EFFECTIVE_URL=>"url",
CURLINFO_CONTENT_TYPE=>"content_type",
CURLINFO_HTTP_CODE=>"http_code",
CURLINFO_HEADER_SIZE=>"header_size",
CURLINFO_REQUEST_SIZE=>"request_size",
CURLINFO_FILETIME=>"filetime",
CURLINFO_SSL_VERIFYRESULT=>"ssl_verify_result",
CURLINFO_REDIRECT_COUNT=>"redirect_count",
CURLINFO_TOTAL_TIME=>"total_time",
CURLINFO_NAMELOOKUP_TIME=>"namelookup_time",
CURLINFO_CONNECT_TIME=>"connect_time",
CURLINFO_PRETRANSFER_TIME=>"pretransfer_time",
CURLINFO_SIZE_UPLOAD=>"size_upload",
CURLINFO_SIZE_DOWNLOAD=>"size_download",
CURLINFO_SPEED_DOWNLOAD=>"speed_download",
CURLINFO_SPEED_UPLOAD=>"speed_upload",
CURLINFO_CONTENT_LENGTH_DOWNLOAD=>"download_content_length",
CURLINFO_CONTENT_LENGTH_UPLOAD=>"upload_content_length",
CURLINFO_STARTTRANSFER_TIME=>"starttransfer_time",
CURLINFO_REDIRECT_TIME=>"redirect_time"
);
$key = $curlinfo_tags[$opt];
return $GLOBALS["_CURLNAT_OPT"][$ch]["stats"][$key];
} else {
return $GLOBALS["_CURLNAT_OPT"][$ch]["stats"];
}
}
function curl_version() {
return "libcurlemu/".CURLNAT_VERSION."-nat";
}
}
?>
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