目录
1. 服务端API
1.1 生成签名
1.1.1 步骤
第一步：获取签名算法
第二步：查看函数输入输出
第三步：nodejs 实现功能
1.1.2 验证签名
小结
1.2 Rest API 调用
1.2.1 签名介绍
1.2.2 腾讯接口
生成管理员 administrator 签名
包装一个 post 请求函数
查询账号
导入单个账号
导入多个账号，一次最多导入 100 个账号
设置用户资料
获取群详细资料
删除群聊
在群组中发送系统通知
小结
1.3 第三方回调
1.3.1 场景举例
1.3.2 回调命令列表
在线状态
资料关系链
单聊消息
群组系统
1.3.3 配置回调
第一步：配置回调服务器
第二步：第三方回调配置
小结
2. IM 用户登录
2.1 类结构设计
2.1.1 正文
类架构图
类设计说明
2.1.2 小结
2.2 工具类 IMManager
重要说明
2.2.1 步骤
常量 Constants
状态枚举，类
SDK 初始化
事件监听 Listener
用户 User
会话 Conversasion
消息 Message
群组 Group
小结
2.3 服务 IMService
2.3.1 关系结构
2.3.2 步骤
创建 IMService
导包
加入 TIM 管理器
初始化 init
SDK
用户
消息
群聊
会话
小结
2.4 断线重连处理
2.4.1 知识点
断线重连
技术处理
2.4.2 步骤
全局初始 IMService
启动 APP 连接成功
断开网络
恢复网络自动断线重连
小结
2.5 用户登录，登出
2.5.1 用户管理
2.5.2 步骤
保存令牌
用户登录
离线用户登录
用户退出
http 401 授权错误
腾讯后台账号管理
小结
2.6 用户登录过期
2.6.1 知识点
令牌过期
2.6.2 处理过程
2.6.3 步骤
处理 V2TIMListener -> onUserSigExpired 过期回调
小结
2.7 多端登录踢下线
2.7.1 步骤
腾讯云后台配置
i18n 多语言
处理 oKickedOffline 回调
效果
小结
2.8 会话响应 IM 状态
2.8.1 步骤
多语言 i18n
会话首页
浮动提示栏组件
IMService 服务器，用户状态
IM 登录
监听服务器离线
小结
3. 聊天用户选取
3.1 用户列表
3.1.1 步骤
搜索用户 api
控制器翻页拉取用户
视图页刷新控制
会话页面发起选择用户
小结
3.2 选择用户
3.2.1 步骤
选取用户控制器
选取用户视图
会话界面接收选中列表数据
小结
4. 单聊功能
4.1 聊天界面布局
4.1.1 步骤
创建聊天业务
导包
聊天控制器
进入聊天
小结
4.2 底部聊天栏位
4.2.1 步骤
聊天栏 ChaBarWidget
聊天 Chat 控制器
聊天 Chat 视图
小结
4.3 发送文字消息
4.3.1 知识点
SDK 函数和类型
V2TimMessage.tatus 消息状态
V2TimMessage.elemType 消息类型
4.3.2 步骤
聊天控制器
聊天视图
小结
4.4 接收显示文字消息
4.4.1 SDK API 接口
getC2CHistoryMessageList 获取单聊历史消息
getGroupHistoryMessageList 获取群组历史消息
4.4.2 类结构
4.4.3 步骤
聊天控制器
聊天视图
IMService 服务
小结
4.5 发送失败消息处理
4.5.1 步骤
i18n多语言
删除不合规消息
重新发送消息
显示错误信息
小结
5. 会话管理
5.1 会话列表
5.1.1 会话接口说明
5.1.2 步骤
会话控制器
会话视图
小结
5.2 更新会话
5.2.1 步骤
会话控制器
会话视图
IM 工具类
IM 会话监听更新
小结
6. 群聊功能
6.1 创建群聊
6.1.1 createGroup 接口说明
6.1.2 步骤
会话控制器
聊天控制器
小结
6.2 群本地消息
insertGroupMessageToLocalStorage 接口说明
V2TimMessage.elemType 消息类型
步骤
消息枚举定义
IMService 服务
会话控制器创建本地消息
聊天控制器
聊天视图
小结
6.3 群提示消息
6.3.1 接口说明
消息内容
V2TimGroupTipsElem.type 群Tips类型
6.3.2 步骤
定义消息枚举
消息类型转字符串
聊天界面显示提示
小结
6.4 群管理侧栏
6.4.1 步骤
群设置组件
聊天控制器
聊天视图
小结
6.5 修改群资料
6.5.1 接口说明
入参
6.5.2 步骤
聊天控制器
群设置侧栏组件
IM 工具类
IMService 群消息处理
小结
6.6 邀请加入
6.6.1 接口说明
入参
返回值
6.6.2 步骤
聊天控制器
群聊侧栏管理组件
小结
6.7 踢出群聊
6.7.1 kickGroupMember 接口说明
入参
6.7.2 步骤
聊天控制器
侧栏视图
IMService 服务
聊天界面系统消息
小结
6.8 退出群聊
6.8.1 quitGroup 接口说明
入参
6.8.2 步骤
im 工具类
imservice
聊天控制器
聊天侧栏
聊天视图
小结
6.9 解散群聊
6.9.1 解散群逻辑
6.9.2 接口说明
FLUTTER SDK dismissGroup 接口
服务器端 destroy_group 接口
6.9.3 步骤
IM 工具类
IMService
聊天控制器
聊天侧栏
会话控制器
小结
7. 信息提示
7.1 未读信息提示
7.1.1 步骤
IMService
main 主视图
IM Manager
聊天控制器
小结
7.2 APP 内提示
7.2.1步骤
overlay_support 插件安装
IM 工具类
IMService
小结
7.3 本机提示
7.3.1 步骤
flutter_local_notifications 包
ios 配置
android 配置
本地消息服务
IM 工具类
ConfigService 配置服务
IMService 腾讯聊天服务类
main 控制器
main 视图
小结
博主wx：yuanlai45_csdn 博主qq：2777137742
后期会创建粉丝群，为同学们提供分享交流平台以及提供官方发送的福利奖品~
PS：重新清理依赖，在拷贝新项目的时候用得上
flutter clean
flutter pub get
1. 服务端API
1.1 生成签名
与腾讯通讯时需要带上 UserSig 签名参数，这个是标识这个用户访问被允许，所以这是必须要做的事情。
签名的方式有两种，一个是客户端签名，这种方式缺点容易被反编译后复制出密钥。
另一种方式是服务端签名，虽然消耗点服务器资源，但是这种比较安全。这是推荐的方式。
本文将会以 nodejs 作为后端，来说明签名过程。毕竟 js 语法大家容易理解。
1.1.1 步骤
第一步：获取签名算法
资料 即时通信 IM 生成 UserSig-服务端 API-文档中心-腾讯云
采用服务端计算 UserSig，可以最大限度地保障计算 UserSig 所用的密钥信息不被泄露。您只需将计算代码部署在您的服务器上，并提供面向 App 的服务端接口，在需要 UserSig 时由您的 App 向业务服务器发起请求获取动态 UserSig。 为了简化实现过程，我们提供了下列语言或平台的 UserSig 计算源码，您可以直接下载并集成到您的服务端。
| 语言版本 | 关键函数 | 下载链接 |
|---|---|---|
| Java | HMAC-SHA256 | genSig |
| GO | HMAC-SHA256 | GenSig |
| PHP | HMAC-SHA256 | genSig |
| Nodejs(这个) | HMAC-SHA256 | genSig |
| Python | HMAC-SHA256 | gen_sig |
| C# | HMAC-SHA256 | GenSig |
| C++ | HMAC-SHA256 | gen_sig |
第二步：查看函数输入输出
资料 tls-sig-api-v2-node/TLSSigAPIv2.js at master · tencentyun/tls-sig-api-v2-node · GitHub
初始化签名对象，传入 appid, key 密钥
...
var Api = function (sdkappid, key) {this.sdkappid = sdkappid;this.key = key;
};
...签名函数，传入 userid 用户编号，expire 过期时间秒，userBuf 默认 null 只有在音视频时才用上
Api.prototype.genSig = function (userid, expire, userBuf) {var currTime = Math.floor(Date.now() / 1000);var sigDoc = {'TLS.ver': "2.0",'TLS.identifier': "" + userid,'TLS.sdkappid': Number(this.sdkappid),'TLS.time': Number(currTime),'TLS.expire': Number(expire)};var sig = '';if (null != userBuf) {var base64UserBuf = base64encode(userBuf);sigDoc['TLS.userbuf'] = base64UserBuf;sig = this._hmacsha256(userid, currTime, expire, base64UserBuf);} else {sig = this._hmacsha256(userid, currTime, expire, null);}sigDoc['TLS.sig'] = sig;var compressed = zlib.deflateSync(newBuffer(JSON.stringify(sigDoc))).toString('base64');return base64url.escape(compressed);
}第三步：nodejs 实现功能
配置环境变量 env
.env
# tim
tim_server=console.tim.qq.com
tim_appid=1400803542
tim_key=密钥xxxxxxxxxxxxxxxxxx初始签名对象
// 腾讯 tim
const tim = new TLSSigAPIv2.Api(config.tim_appid, config.tim_key);
fastify.decorate("tim", tim);生成 UserSig 签名
// tim 签名
const im_sign_expire = 31536000; // 365天
const im_sign = await this.tim.genSig(username, im_sign_expire);使用 apifox 来测试
下载链接Apifox - API 文档、调试、Mock、测试一体化协作平台。拥有接口文档管理、接口调试、Mock、自动化测试等功能，接口开发、测试、联调效率，提升 10 倍。最好用的接口文档管理工具，接口自动化测试工具。
调用 /users/me 接口
客户端保存好你的 im_sign 。
1.1.2 验证签名
登录 - 腾讯云
输入 userid, 签名 sig, 点击开始校验，输出签名信息查看。
果然有效期是 365 天
小结
本节讲了腾讯签名令牌的后端实现方式，业务里面放在了获取用户资料的接口里面，因为我本来就要用 userid 去查询下数据库，这样就一起返回数据了。
如果发现不能登录、提示签名错误的，可以在腾讯后台点击开始校验看下是否签名正确。
apifox接口——可直接在项目设置选择apifix格式导入
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Rest API 调用
腾讯提供了一系列的 api 接口，方便我们维护聊天业务功能，本文会对常见接口做一个介绍。
后面涉及到服务端调用问题不再重复。
用到的接口有用户、聊天群、消息推送。
1.2.1 签名介绍
即时通信 IM REST API 简介-服务端 API-文档中心-腾讯云
REST API 的 URL 格式如下：
https://xxxxxx/$ver/$servicename/$command?sdkappid=$SDKAppID&identifier=$identifier&usersig=$usersig&random=99999999&contenttype=json
其中各个参数的含义以及取值如下（参数名称及其取值均区分大小写）：
| 参数 | 含义 | 取值 |
|---|---|---|
| https | 请求协议 | 请求协议为 HTTPS，请求方式为 POST |
| xxxxxx | 专属域名 | 中国：console.tim.qq.com新加坡：adminapisgp.im.qcloud.com首尔： adminapikr.im.qcloud.com法兰克福：adminapiger.im.qcloud.com孟买：adminapiind.im.qcloud.com硅谷：adminapiusa.im.qcloud.com |
| ver | 协议版本号 | 固定为v4 |
| servicename | 内部服务名，不同的 servicename 对应不同的服务类型 | 示例：v4/im_open_login_svc/account_import，其中im_open_login_svc为servicename更多详情请参见 REST API 接口列表 |
| command | 命令字，与 servicename 组合用来标识具体的业务功能 | 示例：v4/im_open_login_svc/account_import，其中account_import为command更多详情请参见 REST API 接口列表 |
| sdkappid | App 在即时通信 IM 控制台获取的应用标识 | 在申请接入时获得 |
| identifier | 用户名，调用 REST API 时必须为 App 管理员帐号 | 参见 App 管理员 |
| usersig | 用户名对应的密码 | 参见 生成 UserSig |
| random | 标识当前请求的随机数参数 | 32位无符号整数随机数，取值范围0 - 4294967295 |
| contenttype | 请求格式 | 固定值为json |
1.2.2 腾讯接口
生成管理员 administrator 签名
登录 - 腾讯云
进入后台 辅助工具->UserSig生成&校验
配置到项目的 env 中
# tim
tim_server=console.tim.qq.com tim_appid=1400803542 tim_key=4d461a6e470248ffeeb75484xxxxxsssss7ee5b27126c5a728 tim_admin_sig=eJwtzEELgkAUxxxsssszexVNhkrV9VgTbMthZ3JxXBx8n-n7NjRVNn6-Z9weliDXv
包装一个 post 请求函数
async _post(path, jsonValue) {// 随机的32位无符号整数const random = Math.floor(Math.random() * 4294967295)const url = `https://${config.tim_server}/${path}?sdkappid=${config.tim_appid}&identifier=administrator&usersig=${config.tim_admin_sig}&random=${random}&contenttype=json`const res = await superagent.post(url).send(jsonValue).set('accept', 'json')const json = JSON.parse(res.text)return json}查询账号
即时通信 IM 查询账号-服务端 API-文档中心-腾讯云
用于查询自有帐号是否已导入即时通信 IM，支持批量查询。
async queryUser(username) {const req = {CheckItem: [{UserID: username}]}const res = await this._post('v4/im_open_login_svc/account_check', req)if (res.ActionStatus != 'OK') {throw new Error(res)}return res}
