Created
November 30, 2022 01:50
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Strategy Patterns
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interface Strategy { | |
authenticate(args: any[]): boolean; | |
} | |
class Authenticator { | |
strategies: Record<string, Strategy> = {}; | |
use(name: string, strategy: Strategy) { | |
this.strategies[name] = strategy; | |
} | |
authenticate(name: string, ...args: any) { | |
if (!this.strategies[name]) { | |
console.error("Authentication policy has not been set!"); | |
return false; | |
} | |
return this.strategies[name].authenticate.apply(null, args); | |
} | |
} | |
class WechatStrategy implements Strategy { | |
authenticate(args: any[]) { | |
const [token] = args; | |
if (token !== "wc123456") { | |
console.error("Wechat account authentication failed!"); | |
return false; | |
} | |
console.log("Wechat account authentication succeeded!"); | |
return true; | |
} | |
} | |
class LocalStrategy implements Strategy { | |
authenticate(args: any[]) { | |
const [username, password] = args; | |
if (username !== "semlinker" || password !== "888") { | |
console.log("Incorrect username or password!"); | |
return false; | |
} | |
console.log("Account and password authentication succeeded!"); | |
return true; | |
} | |
} | |
const auth = new Authenticator(); | |
auth.use("wechat", new WechatStrategy()); | |
auth.use("local", new LocalStrategy()); | |
function login(mode: string, ...args: any) { | |
return auth.authenticate(mode, args); | |
} | |
login("wechat", "wc123"); | |
login("local", "semlinker", "666"); |
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