Version 3 starter

frontend/src/modules/AuthStore.ts

@@ -0,0 +1,84 @@
+import { TokenResponse } from "api/npm";
+
+export const TOKEN_KEY = "authentications";
+
+export class AuthStore {
+	// Get all tokens from stack
+	get tokens() {
+		const t = localStorage.getItem(TOKEN_KEY);
+		let tokens = [];
+		if (t !== null) {
+			try {
+				tokens = JSON.parse(t);
+			} catch (e) {
+				// do nothing
+			}
+		}
+		return tokens;
+	}
+
+	// Get last token from stack
+	get token() {
+		const t = this.tokens;
+		if (t.length) {
+			return t[t.length - 1];
+		}
+		return null;
+	}
+
+	// Get expires from last token
+	get expires() {
+		const t = this.token;
+		if (t && typeof t.expires !== "undefined") {
+			const expires = Number(t.expires);
+			if (expires && !isNaN(expires)) {
+				return expires;
+			}
+		}
+		return null;
+	}
+
+	// Filter out invalid tokens and return true if we find one that is valid
+	hasActiveToken() {
+		const t = this.tokens;
+		if (!t.length) {
+			return false;
+		}
+
+		const now = Math.round(new Date().getTime() / 1000);
+		const oneMinuteBuffer = 60;
+		for (let i = t.length - 1; i >= 0; i--) {
+			const valid = t[i].expires - oneMinuteBuffer > now;
+			if (valid) {
+				return true;
+			} else {
+				this.drop();
+			}
+		}
+		return false;
+	}
+
+	// Set a single token on the stack
+	set({ token, expires }: TokenResponse) {
+		localStorage.setItem(TOKEN_KEY, JSON.stringify([{ token, expires }]));
+	}
+
+	// Add a token to the stack
+	add({ token, expires }: TokenResponse) {
+		const t = this.tokens;
+		t.push({ token, expires });
+		localStorage.setItem(TOKEN_KEY, t);
+	}
+
+	// Drop a token from the stack
+	drop() {
+		const t = this.tokens;
+		localStorage.setItem(TOKEN_KEY, t.splice(-1, 1));
+	}
+
+	clear() {
+		localStorage.removeItem(TOKEN_KEY);
+	}
+}
+
+export default new AuthStore();