Added Dex support, improved OAuth flow

Author: epiclen

lib/functions/oauth_providers/dex.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * TestLink Open Source Project - http://testlink.sourceforge.net/ 
+ * This script is distributed under the GNU General Public License 2 or later. 
+ *
+ * @filesource  dex.php
+ *
+ * Dex OAUTH API (authentication)
+ *
+ * @internal revisions
+ * @since 1.9.20
+ *
+ */
+
+// Get token
+function oauth_get_token($authCfg, $code) {
+
+  $result = new stdClass();
+  $result->status = array('status' => tl::OK, 'msg' => null);
+
+  // Params to get token
+  $oauthParams = array(
+     'code'          => $code,
+     'client_id'     => $authCfg['oauth_client_id'],
+     'client_secret' => $authCfg['oauth_client_secret'],
+     'grant_type'    => $authCfg['oauth_grant_type']
+  );
+
+  $oauthParams['redirect_uri'] = $authCfg['redirect_uri'];  
+  if( isset($_SERVER['HTTPS']) ) {
+    $oauthParams['redirect_uri'] = 
+      str_replace('http://', 'https://', $oauthParams['redirect_uri']);  
+  }
+
+  // Step #1 - Get the token
+  $curl = curl_init();
+  curl_setopt($curl, CURLOPT_URL, $authCfg['token_url']);
+  curl_setopt($curl, CURLOPT_POST, 1);
+  curl_setopt($curl, CURLOPT_HTTPHEADER, array('Accept: application/json'));
+  curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($oauthParams));
+  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+  curl_setopt($curl, CURLOPT_COOKIESESSION, true);
+  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
+  $result_curl = curl_exec($curl);
+
+  if( $result_curl === false ) {
+    echo 'Curl error: ' . curl_error($curl);
+    echo '<pre>';
+    var_dump(curl_getinfo($curl));
+    echo '</pre>';
+    return false;
+  }
+  curl_close($curl);
+  $tokenInfo = json_decode($result_curl);
+
+  // If token is received start session
+  if (isset($tokenInfo->access_token)) {
+
+    $tokens = explode('.', $tokenInfo->id_token);
+    if (count($tokens) != 3)
+      return false;
+
+    $base64payload = $tokens[1];
+
+    $payload = json_decode(base64_decode($base64payload));
+    if ($payload==false){
+      return false;
+    }
+
+    $result->options = new stdClass();
+    $result->options->givenName = $payload->name;
+    $result->options->familyName = $payload->name;
+    $result->options->user = $payload->email;
+    $result->options->auth = 'oauth';
+    return $result;
+  }
+  $result->status['msg'] = 'An error occurred during getting token';
+  $result->status['status'] = tl::ERROR;
+
+  return $result;
+}