init

dmtp/client/lib/auth.ts

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+/**
+ * Authentication utilities for wallet-based auth
+ */
+
+export class AuthService {
+    private static readonly AUTH_EXPIRY_MS = 5 * 60 * 1000; // 5 minutes, matching server
+
+    /**
+     * Check if user is authenticated with valid credentials
+     */
+    static isAuthenticated(): boolean {
+        if (typeof window === 'undefined') return false;
+
+        const walletAddress = localStorage.getItem('walletAddress');
+        const signature = localStorage.getItem('signature');
+        const timestamp = localStorage.getItem('timestamp');
+
+        if (!walletAddress || !signature || !timestamp) {
+            return false;
+        }
+
+        // Check if timestamp is still valid
+        const authTimestamp = parseInt(timestamp);
+        const now = Date.now();
+        const age = now - authTimestamp;
+
+        return age <= this.AUTH_EXPIRY_MS;
+    }
+
+    /**
+     * Clear authentication data
+     */
+    static clearAuth(): void {
+        if (typeof window === 'undefined') return;
+
+        localStorage.removeItem('walletAddress');
+        localStorage.removeItem('signature');
+        localStorage.removeItem('message');
+        localStorage.removeItem('timestamp');
+    }
+
+    /**
+     * Get stored wallet address
+     */
+    static getWalletAddress(): string | null {
+        if (typeof window === 'undefined') return null;
+        return localStorage.getItem('walletAddress');
+    }
+
+    /**
+     * Store authentication data
+     */
+    static storeAuth(
+        walletAddress: string,
+        signature: string,
+        message: string,
+        timestamp: number
+    ): void {
+        if (typeof window === 'undefined') return;
+
+        localStorage.setItem('walletAddress', walletAddress);
+        localStorage.setItem('signature', signature);
+        localStorage.setItem('message', message);
+        localStorage.setItem('timestamp', timestamp.toString());
+    }
+
+    /**
+     * Generate authentication message for signing
+     */
+    static generateAuthMessage(walletAddress: string, timestamp: number): string {
+        return `Sign this message to authenticate with Celo Task Marketplace.\n\nWallet: ${walletAddress}\nTimestamp: ${timestamp}\n\nThis request will not trigger a blockchain transaction or cost any gas fees.`;
+    }
+}