Add ability to fetch DastSiteProfile via GraphQL

Adds new field to project and associated tests.

doc/api/graphql/reference/gitlab_schema.graphql

@@ -11115,6 +11115,16 @@ type Project {
     last: Int
   ): DastScannerProfileConnection
 
+  """
+  DAST Site Profile associated with the project
+  """
+  dastSiteProfile(
+    """
+    ID of the site profile
+    """
+    id: DastSiteProfileID!
+  ): DastSiteProfile
+
   """
   DAST Site Profiles associated with the project
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -33320,6 +33320,33 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "dastSiteProfile",
+              "description": "DAST Site Profile associated with the project",
+              "args": [
+                {
+                  "name": "id",
+                  "description": "ID of the site profile",
+                  "type": {
+                    "kind": "NON_NULL",
+                    "name": null,
+                    "ofType": {
+                      "kind": "SCALAR",
+                      "name": "DastSiteProfileID",
+                      "ofType": null
+                    }
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "DastSiteProfile",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "dastSiteProfiles",
               "description": "DAST Site Profiles associated with the project",

doc/api/graphql/reference/index.md

@@ -1717,6 +1717,7 @@ Autogenerated return type of PipelineRetry
 | `containerExpirationPolicy` | ContainerExpirationPolicy | The container expiration policy of the project |
 | `containerRegistryEnabled` | Boolean | Indicates if the project stores Docker container images in a container registry |
 | `createdAt` | Time | Timestamp of the project creation |
+| `dastSiteProfile` | DastSiteProfile | DAST Site Profile associated with the project |
 | `description` | String | Short description of the project |
 | `descriptionHtml` | String | The GitLab Flavored Markdown rendering of `description` |
 | `environment` | Environment | A single environment of the project |

ee/app/graphql/ee/types/project_type.rb

@@ -77,6 +77,16 @@ module EE
               description: 'Find iterations',
               resolver: ::Resolvers::IterationsResolver
 
+        field :dast_site_profile,
+              ::Types::DastSiteProfileType,
+              null: true,
+              resolve: -> (obj, args, _ctx) do
+                DastSiteProfilesFinder.new(project_id: obj.id, id: args[:id].model_id).execute.first
+              end,
+              description: 'DAST Site Profile associated with the project' do
+                argument :id, ::Types::GlobalIDType[::DastSiteProfile], required: true, description: 'ID of the site profile'
+              end
+
         field :dast_site_profiles,
               ::Types::DastSiteProfileType.connection_type,
               null: true,

ee/changelogs/unreleased/dast-site-profile-graphql-query.yml

+---
+title: Add ability to fetch DastSiteProfile via GraphQL
+merge_request: 38380
+author:
+type: added

ee/spec/requests/api/graphql/project/dast_site_profile_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Query.project(fullPath).dastSiteProfile' do
+  include GraphqlHelpers
+
+  let_it_be(:dast_site_profile) { create(:dast_site_profile) }
+  let_it_be(:project) { dast_site_profile.project }
+  let_it_be(:current_user) { create(:user) }
+
+  let(:query) do
+    %(
+      query project($fullPath: ID!, $id: DastSiteProfileID!) {
+        project(fullPath: $fullPath) {
+          dastSiteProfile(id: $id) {
+            id
+            profileName
+            targetUrl
+            validationStatus
+          }
+        }
+      }
+    )
+  end
+
+  let(:project_response) { subject.dig('project') }
+  let(:dast_site_profile_response) { project_response.dig('dastSiteProfile') }
+
+  subject do
+    post_graphql(
+      query,
+      current_user: current_user,
+      variables: {
+        fullPath: project.full_path,
+        id: dast_site_profile.to_global_id.to_s
+      }
+    )
+    graphql_data
+  end
+
+  before do
+    stub_licensed_features(security_on_demand_scans: true)
+  end
+
+  context 'when a user does not have access to the project' do
+    it 'returns a null project' do
+      expect(project_response).to be_nil
+    end
+  end
+
+  context 'when a user does not have access to dast_site_profiles' do
+    it 'returns a null dast_site_profile' do
+      project.add_guest(current_user)
+
+      expect(dast_site_profile_response).to be_nil
+    end
+  end
+
+  context 'when a user has access to dast_site_profiles' do
+    before do
+      project.add_developer(current_user)
+    end
+
+    it 'returns a dast_site_profile' do
+      expect(dast_site_profile_response['id']).to eq(dast_site_profile.to_global_id.to_s)
+    end
+
+    context 'when the wrong type of global id is supplied' do
+      it 'returns a null dast_site_profile' do
+        post_graphql(
+          query,
+          current_user: current_user,
+          variables: {
+            fullPath: project.full_path,
+            id: project.to_global_id.to_s
+          }
+        )
+
+        expected_message = 'Variable $id of type DastSiteProfileID! was provided invalid value'
+
+        expect(graphql_errors[0]).to include('message' => expected_message)
+      end
+    end
+
+    context 'when on demand scan feature flag is disabled' do
+      it 'returns a null dast_site_profile' do
+        stub_feature_flags(security_on_demand_scans_feature_flag: false)
+
+        expect(dast_site_profile_response).to be_nil
+      end
+    end
+
+    context 'when on demand scan licensed feature is not available' do
+      it 'returns a null dast_site_profile' do
+        stub_licensed_features(security_on_demand_scans: false)
+
+        expect(dast_site_profile_response).to be_nil
+      end
+    end
+  end
+end