refactor：重构github请求封装

lib/api/github_api.dart

@@ -1,7 +1,56 @@
-class GithubApi {
+import 'dart:convert';
+import 'package:dio/dio.dart';
+import 'package:flutter_picgo/model/github_config.dart';
+import 'package:flutter_picgo/resources/pb_type_keys.dart';
+import 'package:flutter_picgo/utils/image_upload.dart';
+import 'package:flutter_picgo/utils/net.dart';
+import 'package:flutter_picgo/utils/strings.dart';
 
+class GithubApi {
   static const String BASE_URL = 'https://api.github.com/';
 
-  static const String CONTENTS = 'repos/:owner/:repo/contents/:path'; //PUT DELETE GET
+  static const String CONTENTS =
+      'repos/:owner/:repo/contents/:path'; //PUT DELETE GET
 
-}
+  static Future testToken() async {
+    Response res = await NetUtils.getInstance().get(BASE_URL);
+    return res.data;
+  }
+
+  static Future putContent(String url, data) async {
+    var op = await oAuth();
+    Response res = await NetUtils.getInstance()
+        .put(BASE_URL + url ?? '', data: data, options: op);
+    return res.data;
+  }
+
+  static Future deleteContent(String url, data) async {
+    var op = await oAuth();
+    Response res = await NetUtils.getInstance()
+        .delete(BASE_URL + url, data: data, options: op);
+    return res.data;
+  }
+
+  static Future getContents(String url, Map<String, dynamic> params) async {
+    var op = await oAuth();
+    Response res = await NetUtils.getInstance()
+        .get(BASE_URL + url, queryParameters: params, options: op);
+    return res.data;
+  }
+
+  /// 获取配置中的Token
+  static Future<Options> oAuth() async {
+    try {
+      String configStr = await ImageUploadUtils.getPBConfig(PBTypeKeys.github);
+      if (!isBlank(configStr)) {
+        GithubConfig config = GithubConfig.fromJson(json.decode(configStr));
+        if (config != null && config.token != null && config.token != '') {
+          return Options(headers: {"Authorization": 'Token ${config.token}'});
+        }
+      }
+      return null;
+    } catch (e) {
+      return null;
+    }
+  }
+}