首先新建文件夹命名koa-server,npm init,相关包的安装就不说了,这是我的package.json
新建index.js文件,编码如下,config全局配置不用管,redis是一个简单的get和set操作的封装,也不用管
const bodyParser = require("koa-bodyParser"); const Koa = require("koa"); const koaStatic = require("koa-static"); const path = require("path"); const cors = require("koa2-cors"); const koaJwt = require('koa-jwt'); // const const token = require("./model/paytoken") const constroller = require("./controller"); const config = require("./model/config"); const db = require("./model/redis"); const app = new Koa(); //全局配置 global.config = config; global.db = db; global.secret = "tokensecret"; //设置静态目录 app.use(koaStatic(path.resolve(__dirname,"./public"))); //跨域 app.use(cors()); //post 参数解析 app.use(bodyParser()); //token验证是否过期或失效 app.use(token); //容错处理 app.use((ctx,next)=>{ return next().catch((error)=>{ if(error.status === 401){ ctx.status = 401; ctx.body = { code:-1, msg:"token error 401" } } else{ throw error; } }); }); //token过滤规则 app.use(koaJwt({secret:global.secret}).unless({ path:[ /^/api/login/, /^/api/register/, /^((?!/api).)*$/ ] })); //导入controller middleware app.use(constroller()); //启动 app.listen(config.port); console.log(`server start at 3000`);
其中paytoken是token的解析与验证,在这里可以获取加密的相关信息,如userid等,这里保存到ctx上下文,保证是本次请求,命名token_data
const jwt = require('jsonwebtoken'); async function verify(ctx,next){ let url = ctx.request.url; let authorization = ctx.request.headers["authorization"]; if(authorization){ let token = authorization.split(" ")[1]; let payload = jwt.verify(token,global.secret,(error,decoded)=>{ if(error){ ctx.body = { status:-1, msg:"登陆失效" }; } else{ ctx.token_data = decoded; return next(); } }); } else{ return next(); } } module.exports = verify;
controller是路由控制,主要用于路由自动解析,原理是扫描controllers文件夹下的所有js文件,同时对其require导出,规则是必须导出前缀为"PSOT "或"GET "的路由,用于api接口的访问
const fs = require("fs"); function addMapping(router,mapping){ for(let url in mapping){ if(url.startsWith('GET')){ //如果url类似get xxx let path = url.substring(4); router.get(path,mapping[url]); } else if(url.startsWith("POST")){ //如果url 类似post xxx let path = url.substring(5); router.post(path,mapping[url]); } else{ console.log(`invalid URL:${url}`); } } } function addControllers(router,dir){ let files = fs.readdirSync(__dirname + "/" + dir); //过滤js文件 let js_files = files.filter((f)=>{ return f.endsWith(".js"); }); //处理每个js文件 for(let f of js_files){ let mapping = require(__dirname + '/controllers/' + f); addMapping(router,mapping); } } module.exports = function(dir){ let controllers_dir = dir || "controllers"; let router = require("koa-router")(); addControllers(router,controllers_dir); return router.routes(); }
controllers文件夹下新建sign.js文件,处理login和register
const jwt = require('jsonwebtoken'); const db = global.db; //注册路由 let register_func = async (ctx,next)=>{ let name = ctx.request.body.userName; let password = ctx.request.body.password; let userdata = {name,password}; let body; if(!name || !password){ body = { code:-1, msg:"用户名或密码不能为空" } } else if(name.length < 4){ body = { code:-1, msg:"用户名长度必须大于等于4" } } else if(password.length < 8){ body = { code:-1, msg:"密码至少为8位" } } else{ let data = await db.getKey(name); if(data){ body = { code:-1, msg:"用户名重复", } } else{ let result = await db.setKey(name,JSON.stringify(userdata)); if(result == "OK"){ body = { code:0, msg:"注册成功", token:jwt.sign(userdata,global.secret,{expiresIn:'4h'}) } } else{ body = { code:-1, msg:"注册失败,原因未知" } } } } ctx.body = body; } //登录路由 let login_func = async (ctx,next)=>{ let name = ctx.request.body.userName || ""; let password = ctx.request.body.password || ""; if(!name || !password){ ctx.body = { code:-1, msg:"用户名或密码错误" } } else{ let result = await db.getKey(name); let body; if(!result){ body = { code:-1, msg:"用户不存在" } } else{ let data = JSON.parse(result); if(data.password === password){ body = { code:0, msg:"登录成功", token:jwt.sign({name,password},global.secret,{expiresIn:'4h'}) } } else{ body = { code:-1, msg:"密码错误" } } } ctx.body = body; } } module.exports = { "POST /api/login":login_func, "POST /api/register":register_func }
其中生成签名token代码如下
jwt.sign(userdata,global.secret,{expiresIn:'4h'})
接下来post请求/api/login,传入参数成功则生成token返回给客户端,否则失败,注意redis数据库必须有数据
或者/api/register注册,存一个新的
验证token只需要新建一个js,比如排行榜rank.js,如果前端没有在header中设置token或者token设置为不存在的,则会返回401,token error
前端附加token必须是(以vue、axios为例)
大胆尝试是进步的主力,如果连尝试都不去,那什么也做不成,就像有钱人的儿子都很有钱一样,你穷并不是因为你代码写的不好,而是因为世界是不和平的,所以活出自己吧!