Converts widget conflicts state data to GraphQL

Moves the state data used in the conflicts widget state
over to GraphQL.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/235712

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.vue

 <script>
 import $ from 'jquery';
 import { escape } from 'lodash';
-import { GlButton, GlModalDirective } from '@gitlab/ui';
+import { GlButton, GlModalDirective, GlSkeletonLoader } from '@gitlab/ui';
 import { s__, sprintf } from '~/locale';
 import { mouseenter, debouncedMouseleave, togglePopover } from '~/shared/popover';
+import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
+import mergeRequestQueryVariablesMixin from '../../mixins/merge_request_query_variables';
 import StatusIcon from '../mr_widget_status_icon.vue';
+import userPermissionsQuery from '../../queries/permissions.query.graphql';
+import conflictsStateQuery from '../../queries/states/conflicts.query.graphql';
 
 export default {
   name: 'MRWidgetConflicts',
   components: {
+    GlSkeletonLoader,
     StatusIcon,
     GlButton,
   },
   directives: {
     GlModalDirective,
   },
+  mixins: [glFeatureFlagMixin(), mergeRequestQueryVariablesMixin],
+  apollo: {
+    userPermissions: {
+      query: userPermissionsQuery,
+      skip() {
+        return !this.glFeatures.mergeRequestWidgetGraphql;
+      },
+      variables() {
+        return this.mergeRequestQueryVariables;
+      },
+      update: data => data.project.mergeRequest.userPermissions,
+    },
+    stateData: {
+      query: conflictsStateQuery,
+      skip() {
+        return !this.glFeatures.mergeRequestWidgetGraphql;
+      },
+      variables() {
+        return this.mergeRequestQueryVariables;
+      },
+      update: data => data.project.mergeRequest,
+    },
+  },
   props: {
     /* TODO: This is providing all store and service down when it
       only needs a few props */
@@ -24,21 +52,72 @@ export default {
       default: () => ({}),
     },
   },
+  data() {
+    return {
+      userPermissions: {},
+      stateData: {},
+    };
+  },
   computed: {
+    isLoading() {
+      return (
+        this.glFeatures.mergeRequestWidgetGraphql &&
+        this.$apollo.queries.userPermissions.loading &&
+        this.$apollo.queries.stateData.loading
+      );
+    },
+    canPushToSourceBranch() {
+      if (this.glFeatures.mergeRequestWidgetGraphql) {
+        return this.userPermissions.pushToSourceBranch;
+      }
+
+      return this.mr.canPushToSourceBranch;
+    },
+    canMerge() {
+      if (this.glFeatures.mergeRequestWidgetGraphql) {
+        return this.userPermissions.canMerge;
+      }
+
+      return this.mr.canMerge;
+    },
+    shouldBeRebased() {
+      if (this.glFeatures.mergeRequestWidgetGraphql) {
+        return this.stateData.shouldBeRebased;
+      }
+
+      return this.mr.shouldBeRebased;
+    },
+    sourceBranchProtected() {
+      if (this.glFeatures.mergeRequestWidgetGraphql) {
+        return this.stateData.sourceBranchProtected;
+      }
+
+      return this.mr.sourceBranchProtected;
+    },
     popoverTitle() {
       return s__(
         'mrWidget|This feature merges changes from the target branch to the source branch. You cannot use this feature since the source branch is protected.',
       );
     },
     showResolveButton() {
-      return this.mr.conflictResolutionPath && this.mr.canPushToSourceBranch;
+      return this.mr.conflictResolutionPath && this.canPushToSourceBranch;
     },
     showPopover() {
-      return this.showResolveButton && this.mr.sourceBranchProtected;
+      return this.showResolveButton && this.sourceBranchProtected;
     },
   },
-  mounted() {
-    if (this.showPopover) {
+  watch: {
+    showPopover: {
+      handler(newVal) {
+        if (newVal) {
+          this.$nextTick(this.initPopover);
+        }
+      },
+      immediate: true,
+    },
+  },
+  methods: {
+    initPopover() {
       const $el = $(this.$refs.popover);
 
       $el
@@ -68,7 +147,7 @@ export default {
         .on('show.bs.popover', () => {
           window.addEventListener('scroll', togglePopover.bind($el, false), { once: true });
         });
-    }
+    },
   },
 };
 </script>
@@ -76,34 +155,41 @@ export default {
   <div class="mr-widget-body media">
     <status-icon :show-disabled-button="true" status="warning" />
 
-    <div class="media-body space-children">
-      <span v-if="mr.shouldBeRebased" class="bold">
+    <div v-if="isLoading" class="gl-ml-4 gl-w-full mr-conflict-loader">
+      <gl-skeleton-loader :width="334" :height="30">
+        <rect x="0" y="7" width="150" height="16" rx="4" />
+        <rect x="158" y="7" width="84" height="16" rx="4" />
+        <rect x="250" y="7" width="84" height="16" rx="4" />
+      </gl-skeleton-loader>
+    </div>
+    <div v-else class="media-body space-children">
+      <span v-if="shouldBeRebased" class="bold">
         {{
           s__(`mrWidget|Fast-forward merge is not possible.
-To merge this request, first rebase locally.`)
+  To merge this request, first rebase locally.`)
         }}
       </span>
       <template v-else>
         <span class="bold">
-          {{ s__('mrWidget|There are merge conflicts') }}<span v-if="!mr.canMerge">.</span>
-          <span v-if="!mr.canMerge">
+          {{ s__('mrWidget|There are merge conflicts') }}<span v-if="!canMerge">.</span>
+          <span v-if="!canMerge">
             {{
               s__(`mrWidget|Resolve these conflicts or ask someone
-            with write access to this repository to merge it locally`)
+              with write access to this repository to merge it locally`)
             }}
           </span>
         </span>
         <span v-if="showResolveButton" ref="popover">
           <gl-button
-            :href="mr.conflictResolutionPath"
-            :disabled="mr.sourceBranchProtected"
+            :href="!sourceBranchProtected && mr.conflictResolutionPath"
+            :disabled="sourceBranchProtected"
             class="js-resolve-conflicts-button"
           >
             {{ s__('mrWidget|Resolve conflicts') }}
           </gl-button>
         </span>
         <gl-button
-          v-if="mr.canMerge"
+          v-if="canMerge"
           v-gl-modal-directive="'modal-merge-info'"
           class="js-merge-locally-button"
         >

app/assets/javascripts/vue_merge_request_widget/queries/permissions.query.graphql

+query userPermissionsQuery($projectPath: ID!, $iid: String!) {
+  project(fullPath: $projectPath) {
+    mergeRequest(iid: $iid) {
+      userPermissions {
+        canMerge
+        pushToSourceBranch
+      }
+    }
+  }
+}

app/assets/javascripts/vue_merge_request_widget/queries/states/conflicts.query.graphql

+query workInProgressQuery($projectPath: ID!, $iid: String!) {
+  project(fullPath: $projectPath) {
+    mergeRequest(iid: $iid) {
+      shouldBeRebased
+      sourceBranchProtected
+    }
+  }
+}

app/assets/stylesheets/pages/merge_requests.scss

@@ -1039,3 +1039,11 @@ $mr-widget-min-height: 69px;
 .diff-file-row.is-active {
   background-color: $gray-50;
 }
+
+.mr-conflict-loader {
+  max-width: 334px;
+
+  > svg {
+    vertical-align: middle;
+  }
+}

app/graphql/types/merge_request_type.rb

@@ -49,6 +49,8 @@ module Types
           description: 'ID of the merge request target project'
     field :source_branch, GraphQL::STRING_TYPE, null: false,
           description: 'Source branch of the merge request'
+    field :source_branch_protected, GraphQL::BOOLEAN_TYPE, null: false, calls_gitaly: true,
+          description: 'Indicates if the source branch is protected'
     field :target_branch, GraphQL::STRING_TYPE, null: false,
           description: 'Target branch of the merge request'
     field :work_in_progress, GraphQL::BOOLEAN_TYPE, method: :work_in_progress?, null: false,
@@ -194,6 +196,10 @@ module Types
     def commit_count
       object&.metrics&.commits_count
     end
+
+    def source_branch_protected
+      object.source_project.present? && ProtectedBranch.protected?(object.source_project, object.source_branch)
+    end
   end
 end
 Types::MergeRequestType.prepend_if_ee('::EE::Types::MergeRequestType')

doc/api/graphql/reference/gitlab_schema.graphql

@@ -12780,6 +12780,11 @@ type MergeRequest implements CurrentUserTodos & Noteable {
   """
   sourceBranchExists: Boolean!
 
+  """
+  Indicates if the source branch is protected
+  """
+  sourceBranchProtected: Boolean!
+
   """
   Source project of the merge request
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -35042,6 +35042,24 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "sourceBranchProtected",
+              "description": "Indicates if the source branch is protected",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Boolean",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "sourceProject",
               "description": "Source project of the merge request",

doc/api/graphql/reference/index.md

@@ -1950,6 +1950,7 @@ Autogenerated return type of MarkAsSpamSnippet.
 | `shouldRemoveSourceBranch` | Boolean | Indicates if the source branch of the merge request will be deleted after merge |
 | `sourceBranch` | String! | Source branch of the merge request |
 | `sourceBranchExists` | Boolean! | Indicates if the source branch of the merge request exists |
+| `sourceBranchProtected` | Boolean! | Indicates if the source branch is protected |
 | `sourceProject` | Project | Source project of the merge request |
 | `sourceProjectId` | Int | ID of the merge request source project |
 | `state` | MergeRequestState! | State of the merge request |

spec/graphql/types/merge_request_type_spec.rb

@@ -27,7 +27,7 @@ RSpec.describe GitlabSchema.types['MergeRequest'] do
       upvotes downvotes head_pipeline pipelines task_completion_status
       milestone assignees participants subscribed labels discussion_locked time_estimate
       total_time_spent reference author merged_at commit_count current_user_todos
-      conflicts auto_merge_enabled approved_by
+      conflicts auto_merge_enabled approved_by source_branch_protected
     ]
 
     if Gitlab.ee?