Implement 3 endpoints and add 1 model

endpoints:
* createPostLike
* getSite
* getFollowedCommunities

model:
* FullSiteView

lib/client/models/site.dart

@@ -1,5 +1,7 @@
 import 'package:json_annotation/json_annotation.dart';
 
+import '../models/user.dart';
+
 part 'site.g.dart';
 
 /// based on https://github.com/LemmyNet/lemmy/blob/464ea862b10fa7b226b2550268e40d8e685a939c/server/lemmy_db/src/site_view.rs#L31
@@ -60,3 +62,26 @@ class SiteView {
   factory SiteView.fromJson(Map<String, dynamic> json) =>
       _$SiteViewFromJson(json);
 }
+
+@JsonSerializable(fieldRename: FieldRename.snake, createToJson: false)
+class FullSiteView {
+  /// can be null
+  final SiteView site;
+  final List<UserView> admins;
+  final List<UserView> banned;
+  final int online;
+  final String version;
+  final UserView myUser;
+
+  FullSiteView({
+    this.site,
+    this.admins,
+    this.banned,
+    this.online,
+    this.version,
+    this.myUser,
+  });
+
+  factory FullSiteView.fromJson(Map<String, dynamic> json) =>
+      _$FullSiteViewFromJson(json);
+}

lib/client/models/site.g.dart

@@ -32,3 +32,24 @@ SiteView _$SiteViewFromJson(Map<String, dynamic> json) {
     numberOfCommunities: json['number_of_communities'] as int,
   );
 }
+
+FullSiteView _$FullSiteViewFromJson(Map<String, dynamic> json) {
+  return FullSiteView(
+    site: json['site'] == null
+        ? null
+        : SiteView.fromJson(json['site'] as Map<String, dynamic>),
+    admins: (json['admins'] as List)
+        ?.map((e) =>
+            e == null ? null : UserView.fromJson(e as Map<String, dynamic>))
+        ?.toList(),
+    banned: (json['banned'] as List)
+        ?.map((e) =>
+            e == null ? null : UserView.fromJson(e as Map<String, dynamic>))
+        ?.toList(),
+    online: json['online'] as int,
+    version: json['version'] as String,
+    myUser: json['my_user'] == null
+        ? null
+        : UserView.fromJson(json['my_user'] as Map<String, dynamic>),
+  );
+}

lib/client/v1/community_endpoint.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/foundation.dart' show required;
-import 'package:lemmur/client/models/community.dart';
 
+import '../models/community.dart';
 import 'main.dart';
 
 extension CommunityEndpoint on V1 {
@@ -57,4 +57,17 @@ extension CommunityEndpoint on V1 {
 
     return CommunityView.fromJson(res['community']);
   }
+
+  /// GET /user/followed_communities
+  /// https://dev.lemmy.ml/docs/contributing_websocket_http_api.html#get-followed-communities
+  Future<List<CommunityFollowerView>> getFollowedCommunities({
+    @required String auth,
+  }) async {
+    final res = await get('/user/followed_communities', {
+      'auth': auth,
+    });
+    final List<dynamic> communities = res['communities'];
+
+    return communities.map((e) => CommunityFollowerView.fromJson(e)).toList();
+  }
 }

lib/client/v1/main.dart

@@ -7,6 +7,7 @@ import '../models/search.dart';
 export 'comment_endpoint.dart';
 export 'community_endpoint.dart';
 export 'post_endpoint.dart';
+export 'site_endpoint.dart';
 export 'user_endpoint.dart';
 
 class V1 with HttpHelper {

lib/client/v1/post_endpoint.dart

@@ -70,12 +70,18 @@ extension PostEndpoint on V1 {
     @required int postId,
     @required Vote score,
     @required String auth,
-  }) {
+  }) async {
     assert(postId != null);
     assert(score != null);
     assert(auth != null);
 
-    throw UnimplementedError();
+    var res = await post('/post/like', {
+      'post_id': postId,
+      'score': score.value,
+      'auth': auth,
+    });
+
+    return PostView.fromJson(res);
   }
 
   /// PUT /post

lib/client/v1/site_endpoint.dart

@@ -0,0 +1,21 @@
+import '../models/site.dart';
+import '../v1/main.dart';
+
+extension SiteEndpoint on V1 {
+  /// GET /site
+  /// https://dev.lemmy.ml/docs/contributing_websocket_http_api.html#get-site
+  Future<FullSiteView> getSite({String auth}) async {
+    var res = await get('/site', {
+      if (auth != null) 'auth': auth,
+    });
+
+    return FullSiteView.fromJson(res);
+  }
+
+  /// GET /site/config
+  /// https://dev.lemmy.ml/docs/contributing_websocket_http_api.html#get-site-config
+  /// admin stuff
+  Future<String> getSiteConfig() {
+    throw UnimplementedError();
+  }
+}