Refactored so endpoint details are managed in-controller

This changes the setup of things so that controllers manage meta-details
like the endpoint category name and the methods provided, rather than
those being managed in other parts of the app.
This prevents the need of managing references of these details across
other files in the app, since these details can be accessed dynamically
and programatically via the controllers.
An Endpoints class handles references to all controllers and the high
level actions to access the information of these.

Author: ssddanbrown

lib/controller/api_controller.dart

@@ -0,0 +1,11 @@
+import '../service/endpoints.dart';
+
+abstract class ApiController {
+  /// Get details of the endpoints within this controller.
+  EndpointControllerInfo info();
+
+  /// Placeholder endpoint function for not-yet-supported endpoints
+  Future<String> notImplemented() async{
+    return "THIS METHOD IS CURRENTLY NOT SUPPORTED";
+  }
+}

lib/controller/attachments.dart

@@ -1,8 +1,21 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
 
-class Attachments {
+class Attachments extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Attachments', endpoints: {
+      'list': list,
+      'create': create,
+      'read': read,
+      'update': update,
+      'delete': delete,
+    });
+  }
 
   Future<String> list() async{
     print('Trying List');

lib/controller/books.dart

@@ -1,8 +1,25 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
 
-class Books {
+class Books extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Books', endpoints: {
+      'list': list,
+      'create': create,
+      'read': read,
+      'update': update,
+      'delete': delete,
+      'export-html': exportHtml,
+      'export-pdf': exportPdf,
+      'export-plain-text': exportPlain,
+      'export-markdown': exportMarkdown,
+    });
+  }
 
   Future<String> list() async{
     print('Trying List');

lib/controller/chapters.dart

@@ -1,8 +1,25 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
 
-class Chapters {
+class Chapters extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Chapters', endpoints: {
+      'list': list,
+      'create': create,
+      'read': read,
+      'update': update,
+      'delete': delete,
+      'export-html': exportHtml,
+      'export-pdf': exportPdf,
+      'export-plain-text': exportPlain,
+      'export-markdown': exportMarkdown,
+    });
+  }
 
   Future<String> list() async{
     String url = '$urlFull/api/image-gallery';

lib/controller/content_permissions.dart

@@ -1,8 +1,17 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
-import 'dart:convert';
 
-class ContentPermissions {
+class ContentPermissions extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Content Permissions', endpoints: {
+      'read': read,
+      'update': notImplemented,
+    });
+  }
 
   Future<String> read() async{
     String contentType = 'page';

lib/controller/image_gallery.dart

@@ -1,11 +1,21 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
-import 'dart:convert';
 import 'dart:io';
 
-import 'package:http_parser/http_parser.dart';
-
-class image_gallery {
+class ImageGallery extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Image Gallery', endpoints: {
+      'list': list,
+      'create': create,
+      'read': read,
+      'update': update,
+      'delete': delete,
+    });
+  }
 
   Future<String> list() async{
     String url = '$urlFull/api/image-gallery';

lib/controller/methodshandler.dart

@@ -1,8 +1,25 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
 
-class Pages {
+class Pages extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Pages', endpoints: {
+      'list': list,
+      'create': create,
+      'read': read,
+      'update': update,
+      'delete': delete,
+      'export-html': exportHtml,
+      'export-pdf': exportPdf,
+      'export-plain-text': exportPlain,
+      'export-markdown': exportMarkdown,
+    });
+  }
 
   Future<String> list() async{
     String url = '$urlFull/api/pages';

lib/controller/pages.dart

@@ -1,8 +1,18 @@
+import '../service/endpoints.dart';
+import 'api_controller.dart';
 import 'server_info.dart';
 import 'package:http/http.dart' as http;
-import 'dart:convert';
 
-class RecycleBin {
+class RecycleBin extends ApiController {
+
+  @override
+  EndpointControllerInfo info() {
+    return EndpointControllerInfo(label: 'Recycle Bin', endpoints: {
+      'list': list,
+      'restore': notImplemented,
+      'destroy': destroy,
+    });
+  }
 
   Future<String> list() async{
     print('Trying List');
@@ -12,15 +22,6 @@ class RecycleBin {
     return response.body;
   }
 
-  Future<String> restore() async{
-
-    String deletionID= '121';
-
-    String url = '$urlFull/api/recycle-bin/$deletionID';
-    var response = await http.get(Uri.parse(url), headers: headers);
-    return response.body;
-  }
-
 
   Future<String> destroy() async{