(Feat) pass through vertex - allow using credentials defined on litellm router for vertex pass through (#8100)

* test_add_vertex_pass_through_deployment

* VertexPassThroughRouter

* fix use_in_pass_through

* VertexPassThroughRouter

* fix vertex_credentials

* allow using _initialize_deployment_for_pass_through

* test_add_vertex_pass_through_deployment

* _set_default_vertex_config

* fix verbose_proxy_logger

* fix use_in_pass_through

* fix _get_token_and_url

* test_get_vertex_location_from_url

* test_get_vertex_credentials_none

* run pt unit testing again

* fix add_vertex_credentials

* test_adding_deployments.py

* rename file

litellm/proxy/vertex_ai_endpoints/vertex_passthrough_router.py

@@ -0,0 +1,120 @@
+import json
+import re
+from typing import Dict, Optional
+
+from litellm._logging import verbose_proxy_logger
+from litellm.proxy.vertex_ai_endpoints.vertex_endpoints import (
+    VertexPassThroughCredentials,
+)
+
+
+class VertexPassThroughRouter:
+    """
+    Vertex Pass Through Router for Vertex AI pass-through endpoints
+
+
+    - if request specifies a project-id, location -> use credentials corresponding to the project-id, location
+    - if request does not specify a project-id, location -> use credentials corresponding to the DEFAULT_VERTEXAI_PROJECT, DEFAULT_VERTEXAI_LOCATION
+    """
+
+    def __init__(self):
+        """
+        Initialize the VertexPassThroughRouter
+        Stores the vertex credentials for each deployment key
+        ```
+        {
+            "project_id-location": VertexPassThroughCredentials,
+            "adroit-crow-us-central1": VertexPassThroughCredentials,
+        }
+        ```
+        """
+        self.deployment_key_to_vertex_credentials: Dict[
+            str, VertexPassThroughCredentials
+        ] = {}
+        pass
+
+    def get_vertex_credentials(
+        self, project_id: Optional[str], location: Optional[str]
+    ) -> VertexPassThroughCredentials:
+        """
+        Get the vertex credentials for the given project-id, location
+        """
+        from litellm.proxy.vertex_ai_endpoints.vertex_endpoints import (
+            default_vertex_config,
+        )
+
+        deployment_key = self._get_deployment_key(
+            project_id=project_id,
+            location=location,
+        )
+        if deployment_key is None:
+            return default_vertex_config
+        if deployment_key in self.deployment_key_to_vertex_credentials:
+            return self.deployment_key_to_vertex_credentials[deployment_key]
+        else:
+            return default_vertex_config
+
+    def add_vertex_credentials(
+        self,
+        project_id: str,
+        location: str,
+        vertex_credentials: str,
+    ):
+        """
+        Add the vertex credentials for the given project-id, location
+        """
+        from litellm.proxy.vertex_ai_endpoints.vertex_endpoints import (
+            _set_default_vertex_config,
+        )
+
+        deployment_key = self._get_deployment_key(
+            project_id=project_id,
+            location=location,
+        )
+        if deployment_key is None:
+            verbose_proxy_logger.debug(
+                "No deployment key found for project-id, location"
+            )
+            return
+        vertex_pass_through_credentials = VertexPassThroughCredentials(
+            vertex_project=project_id,
+            vertex_location=location,
+            vertex_credentials=vertex_credentials,
+        )
+        self.deployment_key_to_vertex_credentials[deployment_key] = (
+            vertex_pass_through_credentials
+        )
+        verbose_proxy_logger.debug(
+            f"self.deployment_key_to_vertex_credentials: {json.dumps(self.deployment_key_to_vertex_credentials, indent=4, default=str)}"
+        )
+        _set_default_vertex_config(vertex_pass_through_credentials)
+
+    def _get_deployment_key(
+        self, project_id: Optional[str], location: Optional[str]
+    ) -> Optional[str]:
+        """
+        Get the deployment key for the given project-id, location
+        """
+        if project_id is None or location is None:
+            return None
+        return f"{project_id}-{location}"
+
+    @staticmethod
+    def _get_vertex_project_id_from_url(url: str) -> Optional[str]:
+        """
+        Get the vertex project id from the url
+
+        `https://${LOCATION}-aiplatform.googleapis.com/v1/projects/${PROJECT_ID}/locations/${LOCATION}/publishers/google/models/${MODEL_ID}:streamGenerateContent`
+        """
+        match = re.search(r"/projects/([^/]+)", url)
+        return match.group(1) if match else None
+
+    @staticmethod
+    def _get_vertex_location_from_url(url: str) -> Optional[str]:
+        """
+        Get the vertex location from the url
+
+        `https://${LOCATION}-aiplatform.googleapis.com/v1/projects/${PROJECT_ID}/locations/${LOCATION}/publishers/google/models/${MODEL_ID}:streamGenerateContent`
+        """
+        match = re.search(r"/locations/([^/]+)", url)
+        return match.group(1) if match else None