Move legacy services from server.js into services/ (#1958)

This builds on the work of #1931 by moving the legacy services into `services/`.

services/sourcegraph/sourcegraph.service.js

@@ -0,0 +1,35 @@
+'use strict'
+
+const LegacyService = require('../legacy-service')
+const { makeBadgeData: getBadgeData } = require('../../lib/badge-data')
+
+module.exports = class Sourcegraph extends LegacyService {
+  static registerLegacyRouteHandler({ camp, cache }) {
+    camp.route(
+      /^\/sourcegraph\/rrc\/([\s\S]+)\.(svg|png|gif|jpg|json)$/,
+      cache((data, match, sendBadge, request) => {
+        const repo = match[1]
+        const format = match[2]
+        const apiUrl =
+          'https://sourcegraph.com/.api/repos/' + repo + '/-/shield'
+        const badgeData = getBadgeData('used by', data)
+        request(apiUrl, (err, res, buffer) => {
+          if (err != null) {
+            badgeData.text[1] = 'inaccessible'
+            sendBadge(format, badgeData)
+            return
+          }
+          try {
+            badgeData.colorscheme = 'brightgreen'
+            const data = JSON.parse(buffer)
+            badgeData.text[1] = data.value
+            sendBadge(format, badgeData)
+          } catch (e) {
+            badgeData.text[1] = 'invalid'
+            sendBadge(format, badgeData)
+          }
+        })
+      })
+    )
+  }
+}