Add [Modrinth] total downloads badge (#7132)

* Add [Modrinth] total downloads badge

* Check that [Modrinth] downloads value is non-negative

* Remove unnecessary test for negative downloads value

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

services/modrinth/modrinth.service.js

@@ -0,0 +1,47 @@
+import Joi from 'joi'
+import { BaseJsonService } from '../index.js'
+import { metric } from '../text-formatters.js'
+import { downloadCount as downloadCountColor } from '../color-formatters.js'
+import { nonNegativeInteger } from '../validators.js'
+
+const schema = Joi.object({
+  downloads: nonNegativeInteger,
+}).required()
+
+export default class Modrinth extends BaseJsonService {
+  static category = 'downloads'
+
+  static route = {
+    base: 'modrinth/dt',
+    pattern: ':modId',
+  }
+
+  static examples = [
+    {
+      title: 'Modrinth',
+      namedParams: { modId: 'AANobbMI' },
+      staticPreview: this.render({ downloads: 120000 }),
+    },
+  ]
+
+  static defaultBadgeData = { label: 'downloads' }
+
+  static render({ downloads }) {
+    return {
+      message: metric(downloads),
+      color: downloadCountColor(downloads),
+    }
+  }
+
+  async fetch({ modId }) {
+    return this._requestJson({
+      schema,
+      url: `https://api.modrinth.com/api/v1/mod/${modId}`,
+    })
+  }
+
+  async handle({ modId }) {
+    const { downloads } = await this.fetch({ modId })
+    return this.constructor.render({ downloads })
+  }
+}

services/modrinth/modrinth.tester.js

@@ -0,0 +1,12 @@
+import { createServiceTester } from '../tester.js'
+import { isMetric } from '../test-validators.js'
+
+export const t = await createServiceTester()
+
+t.create('Downloads')
+  .get('/AANobbMI.json')
+  .expectBadge({ label: 'downloads', message: isMetric })
+
+t.create('Downloads (not found)')
+  .get('/not-existing.json')
+  .expectBadge({ label: 'downloads', message: 'not found', color: 'red' })