refactor new file download functions to new file

utils/protectedRouteHandler.ts

@@ -0,0 +1,58 @@
+import sha256 from 'crypto-js/sha256'
+import siteConfig from '../config/site.json'
+
+// Hash password token with SHA256
+function encryptToken(token: string): string {
+  return sha256(token).toString()
+}
+
+// Fetch stored token from localStorage and encrypt with SHA256
+export function getStoredToken(path: string): string | null {
+  const storedToken =
+    typeof window !== 'undefined' ? JSON.parse(localStorage.getItem(matchProtectedRoute(path)) as string) : ''
+  return storedToken ? encryptToken(storedToken) : null
+}
+
+/**
+ * Compares the hash of .password and od-protected-token header
+ * @param odTokenHeader od-protected-token header (sha256 hashed token)
+ * @param dotPassword non-hashed .password file
+ * @returns whether the two hashes are the same
+ */
+export function compareHashedToken({
+  odTokenHeader,
+  dotPassword,
+}: {
+  odTokenHeader: string
+  dotPassword: string
+}): boolean {
+  return encryptToken(dotPassword.trim()) === odTokenHeader
+}
+/**
+ * Match the specified route against a list of predefined routes
+ * @param route directory path
+ * @returns whether the directory is protected
+ */
+
+export function matchProtectedRoute(route: string): string {
+  const protectedRoutes: string[] = siteConfig.protectedRoutes
+  let authTokenPath = ''
+
+  for (const r of protectedRoutes) {
+    // protected route array could be empty
+    if (r) {
+      if (
+        route.startsWith(
+          r
+            .split('/')
+            .map(p => encodeURIComponent(p))
+            .join('/')
+        )
+      ) {
+        authTokenPath = r
+        break
+      }
+    }
+  }
+  return authTokenPath
+}