feat(pipeline): Add OrganizationPipelineEndpoint for API-driven pipelines

Add a new REST endpoint that allows driving integration pipelines via
JSON API requests instead of the legacy redirect-based flow. The
endpoint supports initializing a pipeline (POST with action=initialize),
retrieving the current step info (GET), and advancing through steps
(POST with step-specific data).

Uses ControlSiloOrganizationEndpoint as the base class since integration
models live in the control silo, requiring the RPC service layer to
resolve organizations from slugs.

The endpoint rejects pipelines that don't support API mode with a 400,
and returns structured errors for invalid providers, missing sessions,
and unsupported pipeline names.

Refs VDY-36

Author: evanpurkhiser

src/sentry/api/endpoints/organization_pipeline.py

@@ -0,0 +1,125 @@
+from __future__ import annotations
+
+import logging
+
+from rest_framework.request import Request
+from rest_framework.response import Response
+
+from sentry.api.api_owners import ApiOwner
+from sentry.api.api_publish_status import ApiPublishStatus
+from sentry.api.base import control_silo_endpoint
+from sentry.api.bases.organization import (
+    ControlSiloOrganizationEndpoint,
+    OrganizationPermission,
+)
+from sentry.exceptions import NotRegistered
+from sentry.identity.pipeline import IdentityPipeline
+from sentry.integrations.pipeline import (
+    IntegrationPipeline,
+    IntegrationPipelineError,
+    initialize_integration_pipeline,
+)
+from sentry.organizations.services.organization.model import RpcOrganization
+from sentry.pipeline.base import Pipeline
+from sentry.pipeline.types import PipelineStepAction
+
+logger = logging.getLogger(__name__)
+
+# All pipeline classes that can be driven via the API. The endpoint tries each
+# in order and uses whichever one has a valid session for the request.
+PIPELINE_CLASSES = (IntegrationPipeline, IdentityPipeline)
+
+
+class PipelinePermission(OrganizationPermission):
+    scope_map = {
+        "GET": ["org:read", "org:write", "org:admin", "org:integrations"],
+        "POST": ["org:write", "org:admin", "org:integrations"],
+    }
+
+
+def _get_api_pipeline(
+    request: Request, organization: RpcOrganization, pipeline_name: str
+) -> Response | Pipeline:
+    """Look up an active API-ready pipeline from the session, or return an error Response."""
+    try:
+        pipeline_cls = next(cls for cls in PIPELINE_CLASSES if cls.pipeline_name == pipeline_name)
+    except StopIteration:
+        return Response({"detail": "Invalid pipeline type"}, status=404)
+
+    pipeline = pipeline_cls.get_for_request(request._request)
+    if not pipeline or not pipeline.organization:
+        return Response({"detail": "No active pipeline session."}, status=404)
+
+    if not pipeline.is_valid() or pipeline.organization.id != organization.id:
+        return Response({"detail": "Invalid pipeline state."}, status=404)
+
+    if not pipeline.is_api_ready():
+        return Response({"detail": "Pipeline does not support API mode."}, status=400)
+
+    return pipeline
+
+
+@control_silo_endpoint
+class OrganizationPipelineEndpoint(ControlSiloOrganizationEndpoint):
+    owner = ApiOwner.ENTERPRISE
+    publish_status = {
+        "GET": ApiPublishStatus.EXPERIMENTAL,
+        "POST": ApiPublishStatus.EXPERIMENTAL,
+    }
+    permission_classes = (PipelinePermission,)
+
+    def get(
+        self, request: Request, organization: RpcOrganization, pipeline_name: str, **kwargs: object
+    ) -> Response:
+        result = _get_api_pipeline(request, organization, pipeline_name)
+        if isinstance(result, Response):
+            return result
+        return Response(result.get_current_step_info())
+
+    def post(
+        self, request: Request, organization: RpcOrganization, pipeline_name: str, **kwargs: object
+    ) -> Response:
+        if request.data.get("action") == "initialize":
+            return self._initialize_pipeline(request, organization, pipeline_name)
+
+        result = _get_api_pipeline(request, organization, pipeline_name)
+        if isinstance(result, Response):
+            return result
+        pipeline = result
+
+        step_result = pipeline.api_advance(request._request, request.data)
+
+        response_data = step_result.serialize()
+        if step_result.action == PipelineStepAction.ADVANCE:
+            response_data.update(pipeline.get_current_step_info())
+
+        if step_result.action == PipelineStepAction.ERROR:
+            return Response(response_data, status=400)
+
+        return Response(response_data)
+
+    def _initialize_pipeline(
+        self, request: Request, organization: RpcOrganization, pipeline_name: str
+    ) -> Response:
+        if pipeline_name != IntegrationPipeline.pipeline_name:
+            return Response(
+                {"detail": "Initialization not supported for this pipeline."}, status=400
+            )
+
+        provider_id = request.data.get("provider")
+        if not provider_id:
+            return Response({"detail": "provider is required."}, status=400)
+
+        try:
+            pipeline = initialize_integration_pipeline(request._request, organization, provider_id)
+        except NotRegistered:
+            return Response({"detail": f"Unknown provider: {provider_id}"}, status=404)
+        except IntegrationPipelineError as e:
+            return Response({"detail": str(e)}, status=404 if e.not_found else 400)
+
+        if not pipeline.is_api_ready():
+            return Response({"detail": "Pipeline does not support API mode."}, status=400)
+
+        pipeline.set_api_mode()
+
+        return Response(pipeline.get_current_step_info())

src/sentry/api/urls.py

@@ -19,6 +19,7 @@
 from sentry.api.endpoints.organization_insights_tree import OrganizationInsightsTreeEndpoint
 from sentry.api.endpoints.organization_intercom_jwt import OrganizationIntercomJwtEndpoint
 from sentry.api.endpoints.organization_missing_org_members import OrganizationMissingMembersEndpoint
+from sentry.api.endpoints.organization_pipeline import OrganizationPipelineEndpoint
 from sentry.api.endpoints.organization_plugin_deprecation_info import (
     OrganizationPluginDeprecationInfoEndpoint,
 )
@@ -2038,6 +2039,11 @@ def create_group_urls(name_prefix: str) -> list[URLPattern | URLResolver]:
         ExternalUserDetailsEndpoint.as_view(),
         name="sentry-api-0-organization-external-user-details",
     ),
+    re_path(
+        r"^(?P<organization_id_or_slug>[^/]+)/pipeline/(?P<pipeline_name>[^/]+)/$",
+        OrganizationPipelineEndpoint.as_view(),
+        name="sentry-api-0-organization-pipeline",
+    ),
     re_path(
         r"^(?P<organization_id_or_slug>[^/]+)/integration-requests/$",
         OrganizationIntegrationRequestEndpoint.as_view(),