Twitter-compatible API - Error handling that better matches Twitter's

darcs-hash:20080720070905-ca946-dda57dd92210461361fd58b7a3244bf24c01e801.gz

actions/api.php

@@ -46,8 +46,6 @@ class ApiAction extends Action {
 			$this->content_type = strtolower($cmdext[1]);
 		}
 								
-		# common_debug("apiaction = $this->api_action, method = $this->api_method, argument = $this->api_arg, ctype = $this->content_type");
-						
 		# XXX Maybe check to see if the command actually exists first?
 		if($this->requires_auth()) {
 			if (!isset($_SERVER['PHP_AUTH_USER'])) {
@@ -56,7 +54,7 @@ class ApiAction extends Action {
 				header('WWW-Authenticate: Basic realm="Laconica API"');
 				
 				# if the user hits cancel -- bam!
-				common_show_basic_auth_error();		
+				$this->show_basic_auth_error();		
 			} else {
 				$nickname = $_SERVER['PHP_AUTH_USER'];
 				$password = $_SERVER['PHP_AUTH_PW'];
@@ -67,7 +65,7 @@ class ApiAction extends Action {
 					$this->process_command();
 				} else {
 					# basic authentication failed
-					common_show_basic_auth_error();		
+					$this->show_basic_auth_error();		
 				}			
 			}
 		} else {
@@ -124,4 +122,11 @@ class ApiAction extends Action {
 		}
 	}
 	
+	function show_basic_auth_error() {
+	  	header('HTTP/1.1 401 Unauthorized');
+		header('Content-type: text/plain');
+	   	print("Could not authenticate you."); # exactly what Twitter says - no \n
+		exit();
+	}
+		
 }

actions/twitapifriendships.php

@@ -31,7 +31,7 @@ class TwitapifriendshipsAction extends TwitterapiAction {
 		$other = $this->get_user($id);
 
 		if (!$other) {
-			$this->client_error(_('No such user'));
+			$this->client_error(_('Could not follow user: User not found.'), 403, $apidata['content-type']);
 			exit();
 			return;
 		}
@@ -39,7 +39,7 @@ class TwitapifriendshipsAction extends TwitterapiAction {
 		$user = $apidata['user'];
 		
 		if ($user->isSubscribed($other)) {
-			$this->client_error(_('Already subscribed.'));
+			$this->client_error("Could not follow user: $other->nickname is already on your list.", 403, $apidata['content-type']);
 			exit();
 			return;
 		}
@@ -55,7 +55,7 @@ class TwitapifriendshipsAction extends TwitterapiAction {
 		$result = $sub->insert();
 
 		if (!$result) {
-			$this->server_error(_('Could not subscribe'));
+			$this->client_error("Could not follow user: $other->nickname.", 400, $apidata['content-type']);			
 			exit();
 			return;
 		}
@@ -101,7 +101,7 @@ class TwitapifriendshipsAction extends TwitterapiAction {
 			$sub->delete();
 			$sub->query('COMMIT');
 		} else {
-			$this->client_error(_('Not subscribed'));
+			$this->client_error(_('You are not friends with the specified user.'), 403, $apidata['content-type']);			
 			exit();
 		}
 
@@ -127,14 +127,21 @@ class TwitapifriendshipsAction extends TwitterapiAction {
 	
 	function exists($args, $apidata) {
 		parent::handle($args);
+		
+		
 		$user_a_id = $this->trimmed('user_a');
 		$user_b_id = $this->trimmed('user_b');
+		
 		$user_a = $this->get_profile($user_a_id);
 		$user_b = $this->get_profile($user_b_id);
 		
+		if($user_a) { print "got user a profile";}
+		if($user_b) { print "got user b profile";}
+		
+		
 		if (!$user_a || !$user_b) {
-			$this->client_error(_('No such user'));
+			$this->client_error(_('Two user ids or screen_names must be supplied.'), 400, $apidata['content-type']);
-			return;
+			exit();
 		}
 		
 		if ($user_a->isSubscribed($user_b)) {
@@ -151,13 +158,13 @@ class TwitapifriendshipsAction extends TwitterapiAction {
 			break;
 		 case 'json':
 			print json_encode($result);
-			print "\n";
 			break;
 		 default:
 			print $result;
 			break;
 		}
 		
+		exit();
 	}
 
 	function get_profile($id) {

lib/twitterapi.php

@@ -281,6 +281,53 @@ class TwitterapiAction extends Action {
 		}
 	}
 		
+	function client_error($msg, $code = 400, $content_type = 'json') {
+		
+		static $status = array(400 => 'Bad Request',
+							   401 => 'Unauthorized',
+							   402 => 'Payment Required',
+							   403 => 'Forbidden',
+							   404 => 'Not Found',
+							   405 => 'Method Not Allowed',
+							   406 => 'Not Acceptable',
+							   407 => 'Proxy Authentication Required',
+							   408 => 'Request Timeout',
+							   409 => 'Conflict',
+							   410 => 'Gone',
+							   411 => 'Length Required',
+							   412 => 'Precondition Failed',
+							   413 => 'Request Entity Too Large',
+							   414 => 'Request-URI Too Long',
+							   415 => 'Unsupported Media Type',
+							   416 => 'Requested Range Not Satisfiable',
+							   417 => 'Expectation Failed');
+		
+		$action = $this->trimmed('action');
+		
+		common_debug("User error '$code' on '$action': $msg", __FILE__);
+		
+		if (!array_key_exists($code, $status)) {
+			$code = 400;
+		}
+
+		$status_string = $status[$code];
+		header('HTTP/1.1 '.$code.' '.$status_string);
+						
+		if ($content_type == 'xml') {
+			common_start_xml();
+			common_element_start('hash');
+			common_element('error', NULL, $msg);
+			common_element('request', NULL, $_SERVER['REQUEST_URI']);
+			common_element_end('hash');
+			common_end_xml();
+		} else {
+			$error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
+			print(json_encode($error_array));			
+		}
+		
+		exit();
+	}
+
 	function init_twitter_rss() {
 		common_start_xml();
 		common_element_start('rss', array('version' => '2.0'));

lib/util.php

@@ -223,14 +223,6 @@ function common_show_header($pagetitle, $callable=NULL, $data=NULL, $headercall=
 	common_element_start('div', array('id' => 'content'));
 }
 
-# XXX: Refactor w/common_user_error() ?
-function common_show_basic_auth_error() {
-  	header('HTTP/1.1 401 Unauthorized');
-	header('Content-type: text/plain');
-   	print("Could not authenticate you."); # exactly what Twitter says - no \n
-	exit();
-}
-
 function common_show_footer() {
 	global $xw, $config;
 	common_element_end('div'); # content div