Enhance API error handling, add lastError tracking, and implement admin home template

api/api.php

@@ -16,6 +16,7 @@ class gbAPI {
     private $config;
     private $internal;
     private $response;
+    private $lastError;
 
     private function b64url_encode($data) {
         return rtrim(strtr(base64_encode($data), "+/", "-_"), "=");
@@ -40,6 +41,8 @@ class gbAPI {
                     "error_text" => "Authentication failed."
                 ];
 
+                $this->lastError = $data;
+
                 $this->answer($status, $data, true);
             }
         }
@@ -52,17 +55,25 @@ class gbAPI {
             try {
                 $input = json_decode(file_get_contents("php://input"), true);
             } catch (JsonException $error) {
-                $this->answer(400, [
+                $error_payload = [
                     "error" => "invalid_body",
                     "error_text" => "Can not read request body: " . $error
-                ]);
+                ];
+
+                $this->lastError = $error_payload;
+
+                $this->answer(400, $error_payload, true);
             }
             return $input;
         }else{
-            $this->answer(400, [
+            $error_payload = [
                 "error" => "false_request_method",
                 "error_text" => "Only POST allowed"
-            ], true);
+            ];
+
+            $this->lastError = $error_payload;
+
+            $this->answer(400, $error_payload, true);
         }
     }
 
@@ -191,6 +202,14 @@ class gbAPI {
         }
     }
 
+    function returnLastError() {
+        if (isset($this->lastError)) {
+            return $this->lastError;
+        }else{
+            return NULL;
+        }
+    }
+
     function getAnswer() {
         if (!isset($this->response)) {
             $error = [
@@ -199,6 +218,8 @@ class gbAPI {
                 "error_text" => "API Returned nothing."
             ];
 
+            $this->lastError = $error;
+
             return $error;
         }
 
@@ -218,17 +239,25 @@ class gbAPI {
             $db_path = APP_PATH . $db_name;
 
             if (!is_file($db_path)) {
-                $api->answer(500, [
+                $error_payload = [
                     "error" => "database_not_found",
                     "error_text" => "The Database was not found."
-                ], true);
+                ];
+
+                $this->lastError = $error_payload;
+
+                $api->answer(500, $error_payload, true);
             }
 
             if (!is_writeable($db_path)) {
-                $this->answer(500, [
+                $error_payload = [
                     "error" => "database_not_writeable",
                     "error_text" => "The Database is not writeable."
-                ]);
+                ];
+
+                $this->lastError = $error_payload;
+
+                $this->answer(500, $error_payload, true);
                 return;
             }
 
@@ -250,11 +279,14 @@ class gbAPI {
         $command = "SELECT name, value FROM settings WHERE name = :name";
 
         $value = $this->dbCommand($command, true, true, [":name" => $key]);
-
+        
         if (isset($value[0]["value"])) {
             return $value[0]["value"];
         }else{
-            return;
+            $this->answer(500, [
+                "error" => "query_returned_nothing",
+                "error_text" => "The SQL Query Returned nothing usable. Check Database Permissions."
+            ]);
         }
     }
 }