Merge pull request DIRACGrid#7901 from fstagni/cherry-pick-2-6504d155…

…a-integration

[sweep:integration] Standard naming for TokenManager service classes

src/DIRAC/FrameworkSystem/ConfigTemplate.cfg

@@ -25,6 +25,20 @@ Services
       storeHostInfo = Operator
     }
   }
+  ##BEGIN TokenManager:
+  # Section to describe TokenManager system
+  TokenManager
+  {
+    Port = 9181
+    # Description of rules for access to methods
+    Authorization
+    {
+      # Settings by default:
+      Default = authenticated
+      getUsersTokensInfo = ProxyManagement
+    }
+  }
+  ##END
   ##BEGIN TornadoTokenManager:
   # Section to describe TokenManager system
   TornadoTokenManager

src/DIRAC/FrameworkSystem/Service/TokenManagerHandler.py

@@ -0,0 +1,286 @@
+"""TokenManager service is responsible for token management, namely storing, updating,
+requesting new tokens for DIRAC components that have the appropriate permissions.
+
+.. literalinclude:: ../ConfigTemplate.cfg
+    :start-after: ##BEGIN TokenManager:
+    :end-before: ##END
+    :dedent: 2
+    :caption: TokenManager options
+
+The most common use of this service is to obtain tokens with certain scope to return to the user for its purposes,
+or to provide to the DIRAC service to perform asynchronous tasks on behalf of the user.
+This is mainly about the :py:meth:`export_getToken` method.
+
+.. image:: /_static/Systems/FS/TokenManager_getToken.png
+    :alt: https://dirac.readthedocs.io/en/integration/_images/TokenManager_getToken.png (source https://github.com/TaykYoku/DIRACIMGS/raw/main/TokenManagerService_getToken.ai)
+
+The client has a mechanism for caching the received tokens.
+This helps reduce the number of requests to both the service and the Identity Provider (IdP).
+
+If the client has a valid **access token** in the cache, it is used until it expires.
+After that you need to update. The client can update it independently if on the server where it is in ``dirac.cfg``
+``client_id`` and ``client_secret`` of the Identity Provider client are registered.
+
+Otherwise, the client makes an RPC call to the **TornadoManager** service.
+The ``refresh token`` from :py:class:`TokenDB <DIRAC.FrameworkSystem.DB.TokenDB.TokenDB>`
+is taken and the **exchange token** request to Identity Provider is made.
+"""
+
+import pprint
+
+from DIRAC import S_ERROR, S_OK
+from DIRAC.ConfigurationSystem.Client.Helpers import Registry
+from DIRAC.Core.DISET.RequestHandler import RequestHandler
+from DIRAC.Core.Security import Properties
+from DIRAC.FrameworkSystem.DB.TokenDB import TokenDB
+from DIRAC.FrameworkSystem.Utilities.TokenManagementUtilities import (
+    getCachedKey,
+    getIdProviderClient,
+)
+from DIRAC.Resources.IdProvider.IdProviderFactory import IdProviderFactory
+
+
+class TokenManagerHandlerMixin:
+    DEFAULT_AUTHORIZATION = ["authenticated"]
+
+    @classmethod
+    def initializeHandler(cls, *args):
+        """Initialization
+
+        :return: S_OK()/S_ERROR()
+        """
+
+        # The service plays an important OAuth 2.0 role, namely it is an Identity Provider client.
+        # This allows you to manage tokens without the involvement of their owners.
+        cls.idps = IdProviderFactory()
+
+        # Let's try to connect to the database
+        try:
+            cls.__tokenDB = TokenDB(parentLogger=cls.log)
+        except Exception as e:
+            cls.log.exception(e)
+            return S_ERROR(f"Could not connect to the database {repr(e)}")
+
+        return S_OK()
+
+    auth_getUserTokensInfo = ["authenticated"]
+    types_getUserTokensInfo = []
+
+    def export_getUserTokensInfo(self):
+        """Generate information dict about user tokens
+
+        :return: dict
+        """
+        tokensInfo = []
+        credDict = self.getRemoteCredentials()
+        result = Registry.getDNForUsername(credDict["username"])
+        if not result["OK"]:
+            return result
+        for dn in result["Value"]:
+            result = Registry.getIDFromDN(dn)
+            if result["OK"]:
+                result = self.__tokenDB.getTokensByUserID(result["Value"])
+                if not result["OK"]:
+                    return result
+                tokensInfo += result["Value"]
+        return S_OK(tokensInfo)
+
+    auth_getUsersTokensInfo = [Properties.PROXY_MANAGEMENT]
+    types_getUserTokensInfo = [list]
+
+    def export_getUsersTokensInfo(self, users: list):
+        """Get the info about the user tokens in the database
+
+        :param users: user names
+
+        :return: S_OK(list) -- return list of tokens dictionaries
+        """
+        tokensInfo = []
+        for user in users:
+            # Find the user ID among his DNs
+            result = Registry.getDNForUsername(user)
+            if not result["OK"]:
+                return result
+            for dn in result["Value"]:
+                uid = Registry.getIDFromDN(dn).get("Value")
+                if uid:
+                    result = self.__tokenDB.getTokensByUserID(uid)
+                    if not result["OK"]:
+                        self.log.error(result["Message"])
+                    else:
+                        for tokenDict in result["Value"]:
+                            if tokenDict not in tokensInfo:
+                                # The database does not contain a username,
+                                # as it is a unique user ID exclusively for DIRAC
+                                # and is not associated with a token.
+                                tokenDict["username"] = user
+                                tokensInfo.append(tokenDict)
+        return S_OK(tokensInfo)
+
+    types_updateToken = [dict, str, str, int]
+
+    def export_updateToken(self, token: dict, userID: str, provider: str, rt_expired_in: int = 24 * 3600):
+        """Using this method, you can transfer user tokens for storage in the TokenManager.
+
+        It is important to note that TokenManager saves only one token per user and, accordingly,
+        the Identity Provider from which it was issued. So when a new token is delegated,
+        keep in mind that the old token will be deleted.
+
+        :param token: token
+        :param userID: user ID
+        :param provider: provider name
+        :param rt_expired_in: refresh token expires time (in seconds)
+
+        :return: S_OK(list)/S_ERROR() -- list contain uploaded tokens info as dictionaries
+        """
+        self.log.verbose(f"Update {userID} user token issued by {provider}:\n", pprint.pformat(token))
+        # prepare the client instance of the appropriate IdP to revoke the old tokens
+        result = self.idps.getIdProvider(provider)
+        if not result["OK"]:
+            return result
+        idPObj = result["Value"]
+        # overwrite old tokens with new ones
+        result = self.__tokenDB.updateToken(token, userID, provider, rt_expired_in)
+        if not result["OK"]:
+            return result
+        # revoke the old tokens
+        for oldToken in result["Value"]:
+            if "refresh_token" in oldToken and oldToken["refresh_token"] != token["refresh_token"]:
+                self.log.verbose("Revoke old refresh token:\n", pprint.pformat(oldToken))
+                idPObj.revokeToken(oldToken["refresh_token"])
+        # Let's return to the current situation with the storage of user tokens
+        return self.__tokenDB.getTokensByUserID(userID)
+
+    def __checkProperties(self, requestedUserDN: str, requestedUserGroup: str):
+        """Check the properties and return if they can only download limited tokens if authorized
+
+        :param requestedUserDN: user DN
+        :param requestedUserGroup: DIRAC group
+
+        :return: S_OK(bool)/S_ERROR()
+        """
+        credDict = self.getRemoteCredentials()
+        if Properties.FULL_DELEGATION in credDict["properties"]:
+            return S_OK(False)
+        if Properties.LIMITED_DELEGATION in credDict["properties"]:
+            return S_OK(True)
+        if Properties.PRIVATE_LIMITED_DELEGATION in credDict["properties"]:
+            if credDict["DN"] != requestedUserDN:
+                return S_ERROR("You are not allowed to download any token")
+            if Properties.PRIVATE_LIMITED_DELEGATION not in Registry.getPropertiesForGroup(requestedUserGroup):
+                return S_ERROR("You can't download tokens for that group")
+            return S_OK(True)
+        # Not authorized!
+        return S_ERROR("You can't get tokens!")
+
+    types_getToken = [None, None, None, None, None]
+
+    def export_getToken(
+        self,
+        username: str = None,
+        userGroup: str = None,
+        scope: list[str] = None,
+        audience: str = None,
+        identityProvider: str = None,
+        requiredTimeLeft: int = 0,
+    ):
+        """Get an access token for a user/group.
+
+        * Properties:
+            * FullDelegation <- permits full delegation of tokens
+            * LimitedDelegation <- permits downloading only limited tokens
+            * PrivateLimitedDelegation <- permits downloading only limited tokens for one self
+
+        :param username: user name
+        :param userGroup: user group
+        :param scope: requested scope
+        :param audience: requested audience
+        :param identityProvider: Identity Provider name
+        :param requiredTimeLeft: requested minimum life time
+
+        :return: S_OK(dict)/S_ERROR()
+        """
+        # Get an IdProvider Client instance
+        result = getIdProviderClient(userGroup, identityProvider)
+        if not result["OK"]:
+            return result
+        idpObj = result["Value"]
+
+        # getCachedKey is just used here to resolve the default scopes
+        _, scope, *_ = getCachedKey(idpObj, username, userGroup, scope, audience)
+
+        # A client token is requested
+        if not username:
+            result = self.__checkProperties("", "")
+            if not result["OK"]:
+                return result
+
+            # Get the client token with requested scope and audience
+            result = idpObj.fetchToken(grant_type="client_credentials", scope=scope, audience=audience)
+            # DEncode can not encode OAuth2Token object
+            if result["OK"]:
+                result["Value"] = dict(result["Value"])
+
+            return result
+
+        # A user token is requested
+        err = []
+        # No luck so far, let's refresh the token stored in the database
+        result = Registry.getDNForUsername(username)
+        if not result["OK"]:
+            return result
+        for dn in result["Value"]:
+            # For backward compatibility, the user ID is written as DN. So let's check if this DN contains a user ID
+            result = Registry.getIDFromDN(dn)
+            if result["OK"]:
+                uid = result["Value"]
+                # To do this, first find the refresh token stored in the database with the maximum scope
+                result = self.__tokenDB.getTokenForUserProvider(uid, idpObj.name)
+                if result["OK"] and result["Value"]:
+                    tokens = result["Value"]
+                    result = self.__checkProperties(dn, userGroup)
+                    if result["OK"]:
+                        # refresh token with requested scope
+                        result = idpObj.refreshToken(tokens.get("refresh_token"), group=userGroup, scope=scope)
+                        if result["OK"]:
+                            return result
+                # Did not find any token associated with the found user ID
+                err.append(result.get("Message", f"No token found for {uid}"))
+        # Collect all errors when trying to get a token, or if no user ID is registered
+        return S_ERROR("; ".join(err or [f"No user ID found for {username}"]))
+
+    types_deleteToken = [str]
+
+    def export_deleteToken(self, userDN: str):
+        """Delete a token from the DB
+
+        :param userDN: user DN
+
+        :return: S_OK()/S_ERROR()
+        """
+
+        # temporary ugly stuff to make it compliant with proxy management
+        userDN = f"/O=DIRAC/CN={userDN}"
+
+        # Delete it from cache
+        credDict = self.getRemoteCredentials()
+        if Properties.PROXY_MANAGEMENT not in credDict["properties"]:
+            if userDN != credDict["DN"]:
+                return S_ERROR("You aren't allowed!")
+        result = Registry.getIDFromDN(userDN)
+        return self.__tokenDB.removeToken(user_id=result["Value"]) if result["OK"] else result
+
+    types_getTokensByUserID = [str]
+
+    def export_getTokensByUserID(self, userID: str):
+        """Retrieve a token from the DB
+
+        :param userID: user's token id
+
+        :return: S_OK(list)/S_ERROR() token row in dict format
+        """
+        return self.__tokenDB.getTokensByUserID(userID)
+
+
+class TokenManagerHandler(TokenManagerHandlerMixin, RequestHandler):
+    pass