feat: 添加跨平台媒体下载功能

- 新增Media抽象类定义文件下载接口
- 在工厂类中添加createMedia方法
- 实现MediaTT类支持字节跳动小程序文件下载
- 实现MediaWeApp类支持微信小程序文件下载
- 统一代码格式，修复空格和缩进问题

src/platforms/core.ts

@@ -165,3 +165,8 @@ export abstract class UserInfo {
   abstract login(): Promise<ILogin>;
   abstract checkSession(): Promise<ICheckSession>;
 }
+
+
+export abstract class Media {
+  abstract downloadFile(url: string): Promise<void>;
+}

src/platforms/factory.ts

@@ -1,6 +1,6 @@
-import { RewardedVideoAdTT, UserInfoTT } from "./tt";
-import { RewardedVideoAd, UserInfo } from "./core";
-import { RewardedVideoAdWeApp, UserInfoWeApp } from "./weapp";
+import { MediaTT, RewardedVideoAdTT, UserInfoTT } from "./tt";
+import { Media, RewardedVideoAd, UserInfo } from "./core";
+import { MediaWeApp, RewardedVideoAdWeApp, UserInfoWeApp } from "./weapp";
 
 /**
  * 小程序平台全局对象类型声明
@@ -58,6 +58,24 @@ export class PlatformFactory {
   }
 
 
+  createMedia(): Media {
+    switch (this.platform) {
+      case 'tt':
+        return new MediaTT();
+      case 'weapp':
+        throw new MediaWeApp();
+      case 'alipay':
+        throw new Error(`支付宝小程序平台暂未实现`);
+      case 'swan':
+        throw new Error(`百度智能小程序平台暂未实现`);
+      case 'qq':
+        throw new Error(`QQ 小程序平台暂未实现`);
+      default:
+        throw new Error(`不支持的平台类型: ${this.platform}`);
+    }
+  }
+
+
   createUserInfo(): UserInfo {
     switch (this.platform) {
       case 'tt':

src/platforms/tt.ts

@@ -6,7 +6,8 @@ import {
   RewardedVideoAdOptions,
   UserInfo,
   IUserProfile,
-  ICheckSession
+  ICheckSession,
+  Media
 } from "./core";
 
 /**
@@ -240,3 +241,18 @@ export class UserInfoTT extends UserInfo {
     })
   }
 }
+
+
+export class MediaTT extends Media {
+  downloadFile(url: string): Promise<void> {
+    return new Promise((resolve, reject) => {
+      tt.downloadFile({
+        url, success: (res: any) => {
+          resolve(res)
+        }, fail: (res: any) => {
+          reject(res)
+        }
+      })
+    })
+  }
+}

src/platforms/weapp.ts

@@ -6,7 +6,8 @@ import {
     RewardedVideoAdOptions,
     UserInfo,
     IUserProfile,
-    ICheckSession
+    ICheckSession,
+    Media
 } from "./core";
 
 /**
@@ -239,3 +240,18 @@ export class UserInfoWeApp extends UserInfo {
         })
     }
 }
+
+
+export class MediaWeApp extends Media {
+    downloadFile(url: string): Promise<void> {
+        return new Promise((resolve, reject) => {
+            wx.downloadFile({
+                url, success: (res: any) => {
+                    resolve(res)
+                }, fail: (res: any) => {
+                    reject(res)
+                }
+            })
+        })
+    }
+}