Merge branch 'sessionidparam' into 0.9.x

Conflicts:
	lib/command.php

lib/util.php

@@ -171,15 +171,27 @@ function common_ensure_session()
         if (common_config('sessions', 'handle')) {
             Session::setSaveHandler();
         }
+	if (array_key_exists(session_name(), $_GET)) {
+	    $id = $_GET[session_name()];
+	    common_log(LOG_INFO, 'Setting session from GET parameter: '.$id);
+	} else if (array_key_exists(session_name(), $_COOKIE)) {
+	    $id = $_COOKIE[session_name()];
+	    common_log(LOG_INFO, 'Setting session from COOKIE: '.$id);
+	}
+	if (isset($id)) {
+	    session_id($id);
+	    setcookie(session_name(), $id);
+	}
         @session_start();
         if (!isset($_SESSION['started'])) {
             $_SESSION['started'] = time();
-            if (!empty($c)) {
+            if (!empty($id)) {
                 common_log(LOG_WARNING, 'Session cookie "' . $_COOKIE[session_name()] . '" ' .
                            ' is set but started value is null');
             }
         }
     }
+    common_debug("Session ID = " . session_id());
 }
 
 // Three kinds of arguments:
@@ -825,9 +837,39 @@ function common_path($relative, $ssl=false)
         }
     }
 
+    $relative = common_inject_session($relative, $serverpart);
+    
     return $proto.'://'.$serverpart.'/'.$pathpart.$relative;
 }
 
+function common_inject_session($url, $serverpart = null)
+{
+    if (common_have_session()) {
+
+	if (empty($serverpart)) {
+	    $serverpart = parse_url($url, PHP_URL_HOST);
+	}
+	
+        $currentServer = $_SERVER['HTTP_HOST'];
+
+        // Are we pointing to another server (like an SSL server?)
+
+        if (!empty($currentServer) &&
+            0 != strcasecmp($currentServer, $serverpart)) {
+            // Pass the session ID as a GET parameter
+            $sesspart = session_name() . '=' . session_id();
+            $i = strpos($url, '?');
+            if ($i === false) { // no GET params, just append
+                $url .= '?' . $sesspart;
+            } else {
+                $url = substr($url, 0, $i + 1).$sesspart.'&'.substr($url, $i + 1);
+            }
+        }
+    }
+    
+    return $url;
+}
+
 function common_date_string($dt)
 {
     // XXX: do some sexy date formatting