$value )
$req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
// Cut the last '&'
$req=substr($req,0,strlen($req)-1);
return $req;
}
/**
* Submits an HTTP POST to a solvemedia server
* @param string $host
* @param string $path
* @param array $data
* @param int port
* @return array response
*/
function _adcopy_http_post($host, $path, $data, $port = 80) {
$req = _adcopy_qsencode ($data);
$http_request = "POST $path HTTP/1.0\r\n";
$http_request .= "Host: $host\r\n";
$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
$http_request .= "Content-Length: " . strlen($req) . "\r\n";
$http_request .= "User-Agent: solvemedia/PHP\r\n";
$http_request .= "\r\n";
$http_request .= $req;
$response = '';
if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
die ('Could not open socket');
}
fwrite($fs, $http_request);
while ( !feof($fs) )
$response .= fgets($fs, 1024); // One TCP-IP packet [sic]
fclose($fs);
$response = explode("\r\n\r\n", $response, 2);
return $response;
}
/**
* Gets the challenge HTML (javascript and non-javascript version).
* This is called from the browser, and the resulting solvemedia HTML widget
* is embedded within the HTML form it was called from.
* @param string $pubkey A public key for solvemedia
* @param string $error The error given by solvemedia (optional, default is null)
* @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
* @return string - The HTML to be embedded in the user's form.
*/
function solvemedia_get_html ($pubkey, $error = null, $use_ssl = false)
{
if ($pubkey == null || $pubkey == '') {
die ("To use solvemedia you must get an API key from " . ADCOPY_SIGNUP . "");
}
if ($use_ssl) {
$server = ADCOPY_API_SECURE_SERVER;
} else {
$server = ADCOPY_API_SERVER;
}
$errorpart = "";
if ($error) {
$errorpart = ";error=1";
}
return '
';
}
/**
* A SolveMediaResponse is returned from solvemedia_check_answer()
*/
class SolveMediaResponse {
var $is_valid;
var $error;
}
/**
* Calls an HTTP POST function to verify if the user's guess was correct
* @param string $privkey
* @param string $remoteip
* @param string $challenge
* @param string $response
* @param string $hashkey
* @return SolveMediaResponse
*/
function solvemedia_check_answer ($privkey, $remoteip, $challenge, $response, $hashkey = '' )
{
if ($privkey == null || $privkey == '') {
die ("To use solvemedia you must get an API key from " . ADCOPY_SIGNUP . "");
}
if ($remoteip == null || $remoteip == '') {
die ("For security reasons, you must pass the remote ip to solvemedia");
}
//discard spam submissions
if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
$adcopy_response = new SolveMediaResponse();
$adcopy_response->is_valid = false;
$adcopy_response->error = 'incorrect-solution';
return $adcopy_response;
}
$response = _adcopy_http_post (ADCOPY_VERIFY_SERVER, "/papi/verify",
[
'privatekey' => $privkey,
'remoteip' => $remoteip,
'challenge' => $challenge,
'response' => $response,
],
);
$answers = explode ("\n", $response [1]);
$adcopy_response = new SolveMediaResponse();
if( strlen($hashkey) ){
# validate message authenticator
$hash = sha1( $answers[0] . $challenge . $hashkey );
if( $hash != $answers[2] ){
$adcopy_response->is_valid = false;
$adcopy_response->error = 'hash-fail';
return $adcopy_response;
}
}
if (trim ($answers [0]) == 'true') {
$adcopy_response->is_valid = true;
}
else {
$adcopy_response->is_valid = false;
$adcopy_response->error = $answers [1];
}
return $adcopy_response;
}
/**
* gets a URL where the user can sign up for solvemedia. If your application
* has a configuration page where you enter a key, you should provide a link
* using this function.
* @param string $domain The domain where the page is hosted
* @param string $appname The name of your application
*/
function solvemedia_get_signup_url ($domain = null, $appname = null) {
return ADCOPY_SIGNUP . "?" . _adcopy_qsencode ( ['domain' => $domain, 'app' => $appname]);
}
/**
* Calls an HTTP POST function to verify if the user's response was correct
* @param string $privkey
* @param string $$verifycode
* @return SolveMediaResponse
*/
function solvemedia_precheck_response ($privkey, $verifycode)
{
//discard spam submissions
if ($verifycode == null || strlen($verifycode) == 0 ) {
$adcopy_response = new SolveMediaResponse();
$adcopy_response->is_valid = false;
$adcopy_response->error = 'incorrect-solution';
return $adcopy_response;
}
$response = _adcopy_http_post (ADCOPY_VERIFY_SERVER, "/papi/verify.precheck.server",
[
'privatekey' => $privkey,
'verify_code' => $verifycode,
],
);
$answers = explode ("\n", $response [1]);
$adcopy_response = new SolveMediaResponse();
if (trim ($answers [0]) == 'true') {
$adcopy_response->is_valid = true;
}
else {
$adcopy_response->is_valid = false;
$adcopy_response->error = $answers [1];
}
return $adcopy_response;
}