fix: docker image check endpoint and gitlab authn

components/renku_data_services/authn/gitlab.py

@@ -46,13 +46,14 @@ async def authenticate(self, access_token: str, request: Request) -> base_models
     async def _get_gitlab_api_user(self, access_token: str, headers: Header) -> base_models.APIUser:
         """Get and validate a Gitlab API User."""
         client = gitlab.Gitlab(self.gitlab_url, oauth_token=access_token)
-        try:
+        with suppress(gitlab.GitlabAuthenticationError):
             client.auth()  # needed for the user property to be set
-        except gitlab.GitlabAuthenticationError:
-            raise errors.UnauthorizedError(message="User not authorized with Gitlab")
+        if client.user is None:
+            # The user is not authenticated with Gitlab so we send out an empty APIUser
+            # Anonymous Renku users will not be able to authenticate with Gitlab
+            return base_models.APIUser()
+
         user = client.user
-        if user is None:
-            raise errors.UnauthorizedError(message="User not authorized with Gitlab")
 
         if user.state != "active":
             raise errors.ForbiddenError(message="User isn't active in Gitlab")

components/renku_data_services/notebooks/api/classes/image.py

@@ -7,10 +7,10 @@
 from pathlib import PurePosixPath
 from typing import Any, Optional, Self, cast
 
-import requests
+import httpx
 from werkzeug.datastructures import WWWAuthenticate
 
-from ...errors.user import ImageParseError
+from renku_data_services.errors import errors
 
 
 class ManifestTypes(Enum):
@@ -29,16 +29,18 @@ class ImageRepoDockerAPI:
 
     hostname: str
     oauth2_token: Optional[str] = field(default=None, repr=False)
+    # NOTE: We need to follow redirects so that we can authenticate with the image repositories properly.
+    client: httpx.AsyncClient = httpx.AsyncClient(timeout=10, follow_redirects=True)
 
-    def _get_docker_token(self, image: "Image") -> Optional[str]:
+    async def _get_docker_token(self, image: "Image") -> Optional[str]:
         """Get an authorization token from the docker v2 API.
 
         This will return the token provided by the API (or None if no token was found).
         """
         image_digest_url = f"https://{self.hostname}/v2/{image.name}/manifests/{image.tag}"
         try:
-            auth_req = requests.get(image_digest_url, timeout=10)
-        except requests.ConnectionError:
+            auth_req = await self.client.get(image_digest_url)
+        except httpx.ConnectError:
             auth_req = None
         if auth_req is None or not (auth_req.status_code == 401 and "Www-Authenticate" in auth_req.headers):
             # the request status code and header are not what is expected
@@ -54,56 +56,55 @@ def _get_docker_token(self, image: "Image") -> Optional[str]:
         if self.oauth2_token:
             creds = base64.urlsafe_b64encode(f"oauth2:{self.oauth2_token}".encode()).decode()
             headers["Authorization"] = f"Basic {creds}"
-        token_req = requests.get(realm, params=params, headers=headers, timeout=10)
+        token_req = await self.client.get(realm, params=params, headers=headers)
         return str(token_req.json().get("token"))
 
-    def get_image_manifest(self, image: "Image") -> Optional[dict[str, Any]]:
+    async def get_image_manifest(self, image: "Image") -> Optional[dict[str, Any]]:
         """Query the docker API to get the manifest of an image."""
         if image.hostname != self.hostname:
-            raise ImageParseError(
-                f"The image hostname {image.hostname} does not match " f"the image repository {self.hostname}"
+            raise errors.ValidationError(
+                message=f"The image hostname {image.hostname} does not match " f"the image repository {self.hostname}"
             )
-        token = self._get_docker_token(image)
+        token = await self._get_docker_token(image)
         image_digest_url = f"https://{image.hostname}/v2/{image.name}/manifests/{image.tag}"
         headers = {"Accept": ManifestTypes.docker_v2.value}
         if token:
             headers["Authorization"] = f"Bearer {token}"
-        res = requests.get(image_digest_url, headers=headers, timeout=10)
+        res = await self.client.get(image_digest_url, headers=headers)
         if res.status_code != 200:
             headers["Accept"] = ManifestTypes.oci_v1.value
-            res = requests.get(image_digest_url, headers=headers, timeout=10)
+            res = await self.client.get(image_digest_url, headers=headers)
         if res.status_code != 200:
             return None
         return cast(dict[str, Any], res.json())
 
-    def image_exists(self, image: "Image") -> bool:
+    async def image_exists(self, image: "Image") -> bool:
         """Check the docker repo API if the image exists."""
-        return self.get_image_manifest(image) is not None
+        return await self.get_image_manifest(image) is not None
 
-    def get_image_config(self, image: "Image") -> Optional[dict[str, Any]]:
+    async def get_image_config(self, image: "Image") -> Optional[dict[str, Any]]:
         """Query the docker API to get the configuration of an image."""
-        manifest = self.get_image_manifest(image)
+        manifest = await self.get_image_manifest(image)
         if manifest is None:
             return None
         config_digest = manifest.get("config", {}).get("digest")
         if config_digest is None:
             return None
-        token = self._get_docker_token(image)
-        res = requests.get(
+        token = await self._get_docker_token(image)
+        res = await self.client.get(
             f"https://{image.hostname}/v2/{image.name}/blobs/{config_digest}",
             headers={
                 "Accept": "application/json",
                 "Authorization": f"Bearer {token}",
             },
-            timeout=10,
         )
         if res.status_code != 200:
             return None
         return cast(dict[str, Any], res.json())
 
-    def image_workdir(self, image: "Image") -> Optional[PurePosixPath]:
+    async def image_workdir(self, image: "Image") -> Optional[PurePosixPath]:
         """Query the docker API to get the workdir of an image."""
-        config = self.get_image_config(image)
+        config = await self.get_image_config(image)
         if config is None:
             return None
         nested_config = config.get("config", {})
@@ -204,9 +205,9 @@ def build_re(*parts: str) -> re.Pattern:
         if len(matches) == 1:
             return cls(matches[0]["hostname"], matches[0]["image"], matches[0]["tag"])
         elif len(matches) > 1:
-            raise ImageParseError(f"Cannot parse the image {path}, too many interpretations {matches}")
+            raise errors.ValidationError(message=f"Cannot parse the image {path}, too many interpretations {matches}")
         else:
-            raise ImageParseError(f"Cannot parse the image {path}")
+            raise errors.ValidationError(message=f"Cannot parse the image {path}")
 
     def repo_api(self) -> ImageRepoDockerAPI:
         """Get the docker API from the image."""

components/renku_data_services/notebooks/blueprints.py

@@ -315,15 +315,15 @@ async def launch_notebook_helper(
             # A specific image was requested
             parsed_image = Image.from_path(image)
             image_repo = parsed_image.repo_api()
-            image_exists_publicly = image_repo.image_exists(parsed_image)
+            image_exists_publicly = await image_repo.image_exists(parsed_image)
             image_exists_privately = False
             if (
                 not image_exists_publicly
                 and parsed_image.hostname == nb_config.git.registry
                 and internal_gitlab_user.access_token
             ):
                 image_repo = image_repo.with_oauth2_token(internal_gitlab_user.access_token)
-                image_exists_privately = image_repo.image_exists(parsed_image)
+                image_exists_privately = await image_repo.image_exists(parsed_image)
             if not image_exists_privately and not image_exists_publicly:
                 using_default_image = True
                 image = nb_config.sessions.default_image
@@ -349,7 +349,7 @@ async def launch_notebook_helper(
             image_repo = parsed_image.repo_api()
             if is_image_private and internal_gitlab_user.access_token:
                 image_repo = image_repo.with_oauth2_token(internal_gitlab_user.access_token)
-            if not image_repo.image_exists(parsed_image):
+            if not await image_repo.image_exists(parsed_image):
                 raise errors.MissingResourceError(
                     message=(
                         f"Cannot start the session because the following the image {image} does not "
@@ -413,7 +413,7 @@ async def launch_notebook_helper(
         if lfs_auto_fetch is not None:
             parsed_server_options.lfs_auto_fetch = lfs_auto_fetch
 
-        image_work_dir = image_repo.image_workdir(parsed_image) or PurePosixPath("/")
+        image_work_dir = await image_repo.image_workdir(parsed_image) or PurePosixPath("/")
         mount_path = image_work_dir / "work"
 
         server_work_dir = mount_path / gl_project_path
@@ -767,7 +767,7 @@ async def _check_docker_image(
             image_repo = parsed_image.repo_api()
             if parsed_image.hostname == self.nb_config.git.registry and internal_gitlab_user.access_token:
                 image_repo = image_repo.with_oauth2_token(internal_gitlab_user.access_token)
-            if image_repo.image_exists(parsed_image):
+            if await image_repo.image_exists(parsed_image):
                 return HTTPResponse(status=200)
             else:
                 return HTTPResponse(status=404)
@@ -1125,3 +1125,24 @@ async def _handler(
             return json(apispec.SessionLogsResponse.model_validate(logs).model_dump(exclude_none=True))
 
         return "/sessions/<session_id>/logs", ["GET"], _handler
+
+    def check_docker_image(self) -> BlueprintFactoryResponse:
+        """Return the availability of the docker image."""
+
+        @authenticate_2(self.authenticator, self.internal_gitlab_authenticator)
+        async def _check_docker_image(
+            request: Request, user: AnonymousAPIUser | AuthenticatedAPIUser, internal_gitlab_user: APIUser
+        ) -> HTTPResponse:
+            image_url = request.get_args().get("image_url")
+            if not isinstance(image_url, str):
+                raise ValueError("required string of image url")
+            parsed_image = Image.from_path(image_url)
+            image_repo = parsed_image.repo_api()
+            if parsed_image.hostname == self.nb_config.git.registry and internal_gitlab_user.access_token:
+                image_repo = image_repo.with_oauth2_token(internal_gitlab_user.access_token)
+            if await image_repo.image_exists(parsed_image):
+                return HTTPResponse(status=200)
+            else:
+                return HTTPResponse(status=404)
+
+        return "/sessions/images", ["GET"], _check_docker_image