Add GFM component for generic security reports

First pass at GFM component

Add Markdown compnent

* Add unit tests

Apply reviewer feedback

* Refactor component and unit tests

Rework API call

* Move to rest_api dir

Refactor query to use async/await

*  Remove computed props

app/assets/javascripts/api/markdown_api.js

+import axios from '../lib/utils/axios_utils';
+import { buildApiUrl } from './api_utils';
+
+const MARKDOWN_PATH = '/api/:version/markdown';
+
+export function getMarkdown(options) {
+  const url = buildApiUrl(MARKDOWN_PATH);
+  return axios.post(url, {
+    ...options,
+  });
+}

app/assets/javascripts/rest_api.js

 export * from './api/groups_api';
 export * from './api/projects_api';
 export * from './api/user_api';
+export * from './api/markdown_api';
 
 // Note: It's not possible to spy on methods imported from this file in
 // Jest tests. See https://stackoverflow.com/a/53307822/1063392.

ee/app/assets/javascripts/vulnerabilities/components/generic_report/types/constants.js

@@ -11,6 +11,7 @@ export const REPORT_TYPES = {
   fileLocation: 'file-location',
   table: 'table',
   code: 'code',
+  markdown: 'markdown',
 };
 
 const REPORT_TYPE_TO_COMPONENT_MAP = {
@@ -24,6 +25,7 @@ const REPORT_TYPE_TO_COMPONENT_MAP = {
   [REPORT_TYPES.fileLocation]: () => import('./file_location.vue'),
   [REPORT_TYPES.table]: () => import('./table.vue'),
   [REPORT_TYPES.code]: () => import('./code.vue'),
+  [REPORT_TYPES.markdown]: () => import('./markdown.vue'),
 };
 
 export const getComponentNameForType = (reportType) =>

ee/app/assets/javascripts/vulnerabilities/components/generic_report/types/markdown.vue

+<script>
+import { GlSkeletonLoader, GlSafeHtmlDirective as SafeHtml } from '@gitlab/ui';
+import * as Sentry from '@sentry/browser';
+import { getMarkdown } from '~/rest_api';
+
+export default {
+  components: { GlSkeletonLoader },
+  directives: {
+    SafeHtml,
+  },
+  inheritAttrs: false,
+  props: {
+    value: {
+      type: String,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      markdown: '',
+      loading: true,
+      error: false,
+    };
+  },
+  mounted() {
+    this.renderMarkdown();
+  },
+  methods: {
+    async renderMarkdown() {
+      this.loading = true;
+
+      try {
+        const { data } = await getMarkdown({ text: this.value, gfm: true });
+        this.markdown = data.html;
+      } catch (e) {
+        Sentry.captureException(e);
+        this.error = true;
+      }
+
+      this.loading = false;
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <gl-skeleton-loader v-if="loading" :width="200" :lines="2" />
+    <div v-if="markdown" v-safe-html="markdown" data-testid="markdown"></div>
+  </div>
+</template>

ee/spec/frontend/vulnerabilities/generic_report/report_item_spec.js

@@ -34,6 +34,10 @@ const TEST_DATA = {
     lineStart: '1',
     lineEnd: '2',
   },
+  [REPORT_TYPES.markdown]: {
+    name: 'Markdown:',
+    value: 'Checkout [GitLab](http://gitlab.com)',
+  },
 };
 
 describe('ee/vulnerabilities/components/generic_report/report_item.vue', () => {

ee/spec/frontend/vulnerabilities/generic_report/types/markdown_spec.js

+import { GlSkeletonLoader } from '@gitlab/ui';
+import { shallowMount } from '@vue/test-utils';
+import MockAdapter from 'axios-mock-adapter';
+import Markdown from 'ee/vulnerabilities/components/generic_report/types/markdown.vue';
+import { buildApiUrl } from '~/api/api_utils';
+import axios from '~/lib/utils/axios_utils';
+import httpStatusCodes from '~/lib/utils/http_status';
+
+const MARKDOWN_PATH = '/api/:version/markdown';
+
+// Original markdown
+const MARKDOWN = 'Checkout [GitLab](http://gitlab.com) "><script>alert(1)</script>';
+// HTML returned from /api/v4/markdown
+const RENDERED_MARKDOWN =
+  '\u003cp data-sourcepos="1:1-1:79" dir="auto"\u003eCheckout \u003ca href="http://gitlab.com"\u003eGitLab\u003c/a\u003e Hello! Welcome "\u0026gt;\u003c/p\u003e';
+// HTML with v-safe-html
+const HTML_SAFE_RENDERED_MARKDOWN =
+  '\u003cp dir="auto" data-sourcepos="1:1-1:79"\u003eCheckout \u003ca href="http://gitlab.com"\u003eGitLab\u003c/a\u003e Hello! Welcome "\u0026gt;\u003c/p\u003e';
+
+describe('ee/vulnerabilities/components/generic_report/types/markdown.vue', () => {
+  let wrapper;
+  let mock;
+
+  const createWrapper = () => {
+    return shallowMount(Markdown, {
+      propsData: {
+        value: MARKDOWN,
+      },
+    });
+  };
+
+  const findSkeletonLoader = () => wrapper.findComponent(GlSkeletonLoader);
+  const findMarkdown = () => wrapper.find('[data-testid="markdown"]');
+
+  const setUpMockMarkdown = () => {
+    const url = buildApiUrl(MARKDOWN_PATH);
+    mock
+      .onPost(url, {
+        text: MARKDOWN,
+        gfm: true,
+      })
+      .replyOnce(httpStatusCodes.OK, { html: RENDERED_MARKDOWN });
+  };
+
+  beforeEach(() => {
+    mock = new MockAdapter(axios);
+
+    setUpMockMarkdown();
+
+    wrapper = createWrapper();
+  });
+
+  afterEach(() => {
+    mock.restore();
+    wrapper.destroy();
+  });
+
+  describe('when loading', () => {
+    it('shows the loading icon', () => {
+      expect(findSkeletonLoader().exists()).toBe(true);
+    });
+  });
+
+  describe('when loaded', () => {
+    it('shows markdown', async () => {
+      await axios.waitForAll();
+      expect(findSkeletonLoader().exists()).toBe(false);
+      expect(findMarkdown().element.innerHTML).toBe(HTML_SAFE_RENDERED_MARKDOWN);
+    });
+  });
+});