feat: add [GitlabLanguageCount] service (#8377)

* feat: add gitlab language count service

* fix testr

* fix

Signed-off-by: guoxudong <guoxd@jihulab.com>

Signed-off-by: guoxudong <guoxd@jihulab.com>
Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

services/gitlab/gitlab-languages-count.service.js

@@ -0,0 +1,68 @@
+import Joi from 'joi'
+import { optionalUrl } from '../validators.js'
+import { metric } from '../text-formatters.js'
+import { documentation, errorMessagesFor } from './gitlab-helper.js'
+import GitLabBase from './gitlab-base.js'
+
+/*
+We're expecting a response like { "Ruby": 67.13, "JavaScript": 19.66 }
+The keys could be anything and {} is a valid response (e.g: for an empty project)
+*/
+const schema = Joi.object().pattern(/./, Joi.number().min(0).max(100))
+
+const queryParamSchema = Joi.object({
+  gitlab_url: optionalUrl,
+}).required()
+
+export default class GitlabLanguageCount extends GitLabBase {
+  static category = 'analysis'
+
+  static route = {
+    base: 'gitlab/languages/count',
+    pattern: ':project+',
+    queryParamSchema,
+  }
+
+  static examples = [
+    {
+      title: 'GitLab language count',
+      namedParams: {
+        project: 'gitlab-org/gitlab',
+      },
+      queryParams: { gitlab_url: 'https://gitlab.com' },
+      staticPreview: {
+        label: 'languages',
+        message: '5',
+      },
+      documentation,
+    },
+  ]
+
+  static defaultBadgeData = { label: 'languages' }
+
+  static render({ languagesCount }) {
+    return {
+      message: metric(languagesCount),
+      color: 'blue',
+    }
+  }
+
+  async fetch({ project, baseUrl }) {
+    // https://docs.gitlab.com/ee/api/projects.html#languages
+    return super.fetch({
+      schema,
+      url: `${baseUrl}/api/v4/projects/${encodeURIComponent(
+        project
+      )}/languages`,
+      errorMessages: errorMessagesFor('project not found'),
+    })
+  }
+
+  async handle({ project }, { gitlab_url: baseUrl = 'https://gitlab.com' }) {
+    const data = await this.fetch({
+      project,
+      baseUrl,
+    })
+    return this.constructor.render({ languagesCount: Object.keys(data).length })
+  }
+}

services/gitlab/gitlab-languages-count.tester.js

@@ -0,0 +1,25 @@
+import { isMetric } from '../test-validators.js'
+import { createServiceTester } from '../tester.js'
+
+export const t = await createServiceTester()
+
+t.create('language count').get('/gitlab-org/gitlab.json').expectBadge({
+  label: 'languages',
+  message: isMetric,
+  color: 'blue',
+})
+
+t.create('language count (self-managed)')
+  .get('/gitlab-cn/gitlab.json?gitlab_url=https://jihulab.com')
+  .expectBadge({
+    label: 'languages',
+    message: isMetric,
+    color: 'blue',
+  })
+
+t.create('language count (project not found)')
+  .get('/open/guoxudong.io/shields-test/do-not-exist.json')
+  .expectBadge({
+    label: 'languages',
+    message: 'project not found',
+  })