add [PUB] downloads badge (#10745)

* add PUB downloads badge

* test PUB downloads badge

* add PUB monthly downloads badge

* test PUB monthly downloads badge

* revert color override

services/pub/pub-downloads.service.js

@@ -0,0 +1,53 @@
+import Joi from 'joi'
+import { BaseJsonService, pathParams } from '../index.js'
+import { renderDownloadsBadge } from '../downloads.js'
+import { nonNegativeInteger } from '../validators.js'
+import { baseDescription } from './pub-common.js'
+
+const description = `${baseDescription}
+  <p>This badge shows a measure of how many developers have downloaded a package monthly.</p>`
+
+const schema = Joi.object({
+  downloadCount30Days: nonNegativeInteger,
+}).required()
+
+export default class PubDownloads extends BaseJsonService {
+  static category = 'downloads'
+
+  static route = { base: 'pub/dm', pattern: ':packageName' }
+
+  static openApi = {
+    '/pub/dm/{packageName}': {
+      get: {
+        summary: 'Pub Monthly Downloads',
+        description,
+        parameters: pathParams({
+          name: 'packageName',
+          example: 'analysis_options',
+        }),
+      },
+    },
+  }
+
+  static defaultBadgeData = { label: 'downloads' }
+
+  static render({ downloadCount30Days }) {
+    return renderDownloadsBadge({
+      downloads: downloadCount30Days,
+      interval: 'month',
+    })
+  }
+
+  async fetch({ packageName }) {
+    return this._requestJson({
+      schema,
+      url: `https://pub.dev/api/packages/${packageName}/score`,
+    })
+  }
+
+  async handle({ packageName }) {
+    const score = await this.fetch({ packageName })
+    const downloadCount30Days = score.downloadCount30Days
+    return this.constructor.render({ downloadCount30Days })
+  }
+}

services/pub/pub-downloads.tester.js

@@ -0,0 +1,28 @@
+import { isMetricOverTimePeriod } from '../test-validators.js'
+import { createServiceTester } from '../tester.js'
+
+export const t = await createServiceTester()
+
+t.create('pub monthly downloads (valid)')
+  .get('/analysis_options.json')
+  .expectBadge({
+    label: 'downloads',
+    message: isMetricOverTimePeriod,
+    color: 'green',
+  })
+
+t.create('pub monthly downloads (not found)')
+  .get('/analysisoptions.json')
+  .expectBadge({
+    label: 'downloads',
+    message: 'not found',
+    color: 'red',
+  })
+
+t.create('pub monthly downloads (invalid)')
+  .get('/analysis-options.json')
+  .expectBadge({
+    label: 'downloads',
+    message: 'invalid',
+    color: 'lightgrey',
+  })