msw: Implement GET /api/v1/crates/:name/:version/downloads request handler

Author: Turbo87

packages/crates-io-msw/handlers/versions.js

@@ -1,5 +1,6 @@
 import dependencies from './versions/dependencies.js';
+import downloads from './versions/downloads.js';
 import getVersion from './versions/get.js';
 import listVersions from './versions/list.js';
 
-export default [listVersions, getVersion, dependencies];
+export default [listVersions, getVersion, dependencies, downloads];

packages/crates-io-msw/handlers/versions/downloads.js

@@ -0,0 +1,30 @@
+import { http, HttpResponse } from 'msw';
+
+import { db } from '../../index.js';
+import { notFound } from '../../utils/handlers.js';
+
+export default http.get('/api/v1/crates/:name/:version/downloads', async ({ params }) => {
+  let crate = db.crate.findFirst({ where: { name: { equals: params.name } } });
+  if (!crate) return notFound();
+
+  let version = db.version.findFirst({
+    where: {
+      crate: { id: { equals: crate.id } },
+      num: { equals: params.version },
+    },
+  });
+  if (!version) {
+    let errorMessage = `crate \`${crate.name}\` does not have a version \`${params.version}\``;
+    return HttpResponse.json({ errors: [{ detail: errorMessage }] }, { status: 404 });
+  }
+
+  let downloads = db.versionDownload.findMany({ where: { version: { id: { equals: version.id } } } });
+
+  return HttpResponse.json({
+    version_downloads: downloads.map(download => ({
+      date: download.date,
+      downloads: download.downloads,
+      version: download.version.id,
+    })),
+  });
+});

packages/crates-io-msw/handlers/versions/downloads.test.js

@@ -0,0 +1,58 @@
+import { assert, test } from 'vitest';
+
+import { db } from '../../index.js';
+
+test('returns 404 for unknown crates', async function () {
+  let response = await fetch('/api/v1/crates/foo/1.0.0/downloads');
+  assert.strictEqual(response.status, 404);
+  assert.deepEqual(await response.json(), { errors: [{ detail: 'Not Found' }] });
+});
+
+test('returns 404 for unknown versions', async function () {
+  db.crate.create({ name: 'rand' });
+
+  let response = await fetch('/api/v1/crates/rand/1.0.0/downloads');
+  assert.strictEqual(response.status, 404);
+  assert.deepEqual(await response.json(), { errors: [{ detail: 'crate `rand` does not have a version `1.0.0`' }] });
+});
+
+test('empty case', async function () {
+  let crate = db.crate.create({ name: 'rand' });
+  db.version.create({ crate, num: '1.0.0' });
+
+  let response = await fetch('/api/v1/crates/rand/1.0.0/downloads');
+  assert.strictEqual(response.status, 200);
+  assert.deepEqual(await response.json(), {
+    version_downloads: [],
+  });
+});
+
+test('returns a list of version downloads belonging to the specified crate version', async function () {
+  let crate = db.crate.create({ name: 'rand' });
+  let version = db.version.create({ crate, num: '1.0.0' });
+  db.versionDownload.create({ version, date: '2020-01-13' });
+  db.versionDownload.create({ version, date: '2020-01-14' });
+  db.versionDownload.create({ version, date: '2020-01-15' });
+
+  let response = await fetch('/api/v1/crates/rand/1.0.0/downloads');
+  assert.strictEqual(response.status, 200);
+  assert.deepEqual(await response.json(), {
+    version_downloads: [
+      {
+        date: '2020-01-13',
+        downloads: 7035,
+        version: 1,
+      },
+      {
+        date: '2020-01-14',
+        downloads: 14_070,
+        version: 1,
+      },
+      {
+        date: '2020-01-15',
+        downloads: 21_105,
+        version: 1,
+      },
+    ],
+  });
+});