refactor [cdnjs] integration

lib/all-badge-examples.js

@@ -739,14 +739,6 @@ const allBadgeExamples = [
       name: 'Version'
     },
     examples: [
-      {
-        title: 'CDNJS',
-        previewUri: '/cdnjs/v/jquery.svg',
-        keywords: [
-          'cdn',
-          'cdnjs'
-        ]
-      },
       {
         title: 'npm',
         previewUri: '/npm/v/npm.svg',

lib/error-helper.js

@@ -39,7 +39,7 @@ async function asJson({ buffer, res }) {
   try {
     return JSON.parse(buffer);
   } catch (err) {
-    throw new InvalidResponse();
+    throw new InvalidResponse(undefined, err);
   }
 };
 

server.js

@@ -1609,39 +1609,6 @@ cache(function(data, match, sendBadge, request) {
   });
 }));
 
-// CDNJS version integration
-camp.route(/^\/cdnjs\/v\/(.*)\.(svg|png|gif|jpg|json)$/,
-cache(function(data, match, sendBadge, request) {
-  const library = encodeURIComponent(match[1]);  // eg, "express" or "@user/express"
-  const format = match[2];
-  const apiUrl = 'https://api.cdnjs.com/libraries/' + library + '?fields=version';
-  const badgeData = getBadgeData('cdnjs', data);
-  request(apiUrl, function(err, res, buffer) {
-    if (err != null) {
-      badgeData.text[1] = 'inaccessible';
-      sendBadge(format, badgeData);
-      return;
-    }
-    try {
-      const json = JSON.parse(buffer);
-      if (Object.keys(json).length === 0) {
-        /* Note the 'not found' response from cdnjs is:
-           status code = 200, body = {} */
-        badgeData.text[1] = 'not found';
-        sendBadge(format, badgeData);
-        return;
-      }
-      const version = json.version || 0;
-      badgeData.text[1] = versionText(version);
-      badgeData.colorscheme = versionColor(version);
-      sendBadge(format, badgeData);
-    } catch(e) {
-      badgeData.text[1] = 'invalid';
-      sendBadge(format, badgeData);
-    }
-  });
-}));
-
 // npm weekly download integration.
 mapNpmDownloads({ camp, cache }, 'dw', 'last-week');
 

services/cdnjs/cdnjs.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const BaseService = require('../base');
+const {
+  checkErrorResponse,
+  asJson,
+} = require('../../lib/error-helper');
+const { NotFound } = require('../errors');
+const { addv: versionText } = require('../../lib/text-formatters');
+const { version: versionColor} = require('../../lib/color-formatters');
+
+module.exports = class Cdnjs extends BaseService {
+  async handle({library}) {
+    const apiUrl = 'https://api.cdnjs.com/libraries/' + library + '?fields=version';
+    const json = await this._sendAndCacheRequest(apiUrl, {
+      headers: { 'Accept': 'application/json' }
+    }).then(checkErrorResponse.asPromise())
+      .then(asJson);
+
+    if (Object.keys(json).length === 0) {
+      /* Note the 'not found' response from cdnjs is:
+         status code = 200, body = {} */
+      throw new NotFound();
+    }
+    const version = json.version || 0;
+
+    return {
+      message: versionText(version),
+      color: versionColor(version)
+    };
+  }
+
+  // Metadata
+  static get defaultBadgeData() {
+    return { label: 'cdnjs' };
+  }
+
+  static get category() {
+    return 'version';
+  }
+
+  static get url() {
+    return {
+      base: 'cdnjs/v',
+      format: '(.*)',
+      capture: ['library']
+    };
+  }
+
+  static get examples() {
+    return [
+      {
+        previewUrl: 'jquery',
+        keywords: [
+          'cdn',
+          'cdnjs'
+        ]
+      }
+    ];
+  }
+};