Fix: admin client (#13699)

### What problem does this PR solve?

Define a crypt function in admin directory, remove import from
api.utils. And move requests-toolbelt to dependency.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

admin/client/pyproject.toml

@@ -11,13 +11,13 @@ dependencies = [
     "beartype>=0.20.0,<1.0.0",
     "pycryptodomex>=3.10.0",
     "lark>=1.1.0",
+    "requests-toolbelt>=1.0.0",
 ]
 
 [dependency-groups]
 test = [
     "pytest>=8.3.5",
     "requests>=2.32.3",
-    "requests-toolbelt>=1.0.0",
 ]
 
 [tool.setuptools]

admin/client/user.py

@@ -26,7 +26,19 @@ class AuthException(Exception):
 
 def encrypt_password(password_plain: str) -> str:
     try:
-        from api.utils.crypt import crypt
+        import base64
+        from Cryptodome.PublicKey import RSA
+        from Cryptodome.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5
+        def crypt(line):
+            """
+            decrypt(crypt(input_string)) == base64(input_string), which frontend and ragflow_cli use.
+            """
+            pub = "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArq9XTUSeYr2+N1h3Afl/z8Dse/2yD0ZGrKwx+EEEcdsBLca9Ynmx3nIB5obmLlSfmskLpBo0UACBmB5rEjBp2Q2f3AG3Hjd4B+gNCG6BDaawuDlgANIhGnaTLrIqWrrcm4EMzJOnAOI1fgzJRsOOUEfaS318Eq9OVO3apEyCCt0lOQK6PuksduOjVxtltDav+guVAA068NrPYmRNabVKRNLJpL8w4D44sfth5RvZ3q9t+6RTArpEtc5sh5ChzvqPOzKGMXW83C95TxmXqpbK6olN4RevSfVjEAgCydH6HN6OhtOQEcnrU97r9H0iZOWwbw3pVrZiUkuRD1R56Wzs2wIDAQAB\n-----END PUBLIC KEY-----"
+            rsa_key = RSA.importKey(pub)
+            cipher = Cipher_pkcs1_v1_5.new(rsa_key)
+            password_base64 = base64.b64encode(line.encode('utf-8')).decode("utf-8")
+            encrypted_password = cipher.encrypt(password_base64.encode())
+            return base64.b64encode(encrypted_password).decode('utf-8')
     except Exception as exc:
         raise AuthException(
             "Password encryption unavailable; install pycryptodomex (uv sync --python 3.12 --group test)."