feat: add AuthWeakPasswordError (#817)

Throws an `AuthWeakPasswordError` on non-200 JSON reponses that have the
`weak_password` property as defined in:

-
https://github.com/supabase/gotrue/blob/master/internal/api/password.go
-
https://github.com/supabase/gotrue/blob/master/internal/api/errors.go#L244

src/lib/errors.ts

@@ -124,3 +124,25 @@ export class AuthRetryableFetchError extends CustomAuthError {
 export function isAuthRetryableFetchError(error: unknown): error is AuthRetryableFetchError {
   return isAuthError(error) && error.name === 'AuthRetryableFetchError'
 }
+
+/**
+ * This error is thrown on certain methods when the password used is deemed
+ * weak. Inspect the reasons to identify what password strength rules are
+ * inadequate.
+ */
+export class AuthWeakPasswordError extends CustomAuthError {
+  /**
+   * Reasons why the password is deemed weak.
+   */
+  reasons: ('length' | 'characters' | 'pwned' | string)[]
+
+  constructor(message: string, status: number, reasons: string[]) {
+    super(message, 'AuthWeakPasswordError', status)
+
+    this.reasons = reasons
+  }
+}
+
+export function isAuthWeakPasswordError(error: unknown): error is AuthWeakPasswordError {
+  return isAuthError(error) && error.name === 'AuthWeakPasswordError'
+}

src/lib/fetch.ts

@@ -7,7 +7,12 @@ import {
   User,
   UserResponse,
 } from './types'
-import { AuthApiError, AuthRetryableFetchError, AuthUnknownError } from './errors'
+import {
+  AuthApiError,
+  AuthRetryableFetchError,
+  AuthWeakPasswordError,
+  AuthUnknownError,
+} from './errors'
 
 export type Fetch = typeof fetch
 
@@ -46,6 +51,22 @@ async function handleError(error: unknown) {
     throw new AuthUnknownError(_getErrorMessage(e), e)
   }
 
+  if (
+    typeof data === 'object' &&
+    data &&
+    typeof data.weak_password === 'object' &&
+    data.weak_password &&
+    Array.isArray(data.weak_password.reasons) &&
+    data.weak_password.reasons.length &&
+    data.weak_password.reduce((a: boolean, i: any) => a && typeof i === 'string', true)
+  ) {
+    throw new AuthWeakPasswordError(
+      _getErrorMessage(data),
+      error.status,
+      data.weak_password.reasons
+    )
+  }
+
   throw new AuthApiError(_getErrorMessage(data), error.status || 500)
 }
 

src/lib/helpers.ts

@@ -290,8 +290,11 @@ function base64urlencode(str: string) {
 }
 
 export async function generatePKCEChallenge(verifier: string) {
-  const hasCryptoSupport = typeof crypto !== 'undefined' && typeof crypto.subtle !== 'undefined' && typeof TextEncoder !== 'undefined';
-
+  const hasCryptoSupport =
+    typeof crypto !== 'undefined' &&
+    typeof crypto.subtle !== 'undefined' &&
+    typeof TextEncoder !== 'undefined'
+
   if (!hasCryptoSupport) {
     console.warn(
       'WebCrypto API is not supported. Code challenge method will default to use plain instead of sha256.'