Add [dependabot] SemVer compatibility badge (badges#1734)

* Add [dependabot] SemVer compatibility badge

* Add dependabot logo

* Clean up and additional tests

lib/all-badge-examples.js

@@ -2221,6 +2221,10 @@ const allBadgeExamples = [
       {
         title: 'Sourcegraph for Repo Reference Count',
         previewUri: '/sourcegraph/rrc/github.com/gorilla/mux.svg'
+      },
+      {
+        title: 'SemVer Compatibility',
+        previewUri: '/dependabot/semver/bundler/puma.svg'
       }
     ]
   }

server.js

@@ -7889,6 +7889,38 @@ cache(function (data, match, sendBadge, request) {
   });
 }));
 
+// Dependabot SemVer compatibility integration
+camp.route(/^\/dependabot\/semver\/([^/]+)\/(.+)\.(svg|png|gif|jpg|json)$/,
+cache(function(data, match, sendBadge, request) {
+  const packageManager = match[1];
+  const dependencyName = match[2];
+  const format = match[3];
+  const options = {
+    method: 'GET',
+    headers: { 'Accept': 'application/json' },
+    uri: `https://api.dependabot.com/badges/compatibility_score?package-manager=${packageManager}&dependency-name=${dependencyName}&version-scheme=semver`
+  };
+  const badgeData = getBadgeData('semver compatibility', data);
+  badgeData.links = [`https://dependabot.com/compatibility-score.html?package-manager=${packageManager}&dependency-name=${dependencyName}&version-scheme=semver`];
+  badgeData.logo = getLogo('dependabot', data);
+  request(options, function(err, res) {
+    if (checkErrorResponse(badgeData, err, res)) {
+      sendBadge(format, badgeData);
+      return;
+    }
+    try {
+      const dependabotData = JSON.parse(res['body']);
+      badgeData.text[1] = dependabotData.status;
+      badgeData.colorscheme = dependabotData.colour;
+      sendBadge(format, badgeData);
+    } catch(e) {
+      badgeData.text[1] = 'invalid';
+      badgeData.colorscheme = 'red';
+      sendBadge(format, badgeData);
+    }
+  });
+}));
+
 // Any badge.
 camp.route(/^\/(:|badge\/)(([^-]|--)*?)-(([^-]|--)*)-(([^-]|--)+)\.(svg|png|gif|jpg)$/,
 function(data, match, end, ask) {

services/dependabot/dependabot.tester.js

@@ -0,0 +1,57 @@
+'use strict';
+
+const Joi = require('joi');
+const ServiceTester = require('../service-tester');
+const { isIntegerPercentage } = require('../test-validators');
+const { invalidJSON } = require('../response-fixtures');
+const colorscheme = require('../../lib/colorscheme.json');
+const mapValues = require('lodash.mapvalues');
+const colorsB = mapValues(colorscheme, 'colorB');
+
+const t = new ServiceTester({ id: 'dependabot', title: 'Dependabot' });
+module.exports = t;
+
+t.create('semver compatibility (valid)')
+  .get('/semver/bundler/puma.json?style=_shields_test')
+  .expectJSONTypes(Joi.object().keys({
+    name: 'semver compatibility',
+    value: isIntegerPercentage,
+    link: 'https://dependabot.com/compatibility-score.html?dependency-name=puma&package-manager=bundler&version-scheme=semver',
+    colorB: Joi.equal(colorsB.brightgreen, colorsB.orange).required()
+  }));
+
+t.create('semver compatibility (connection error)')
+  .get('/semver/bundler/puma.json?style=_shields_test')
+  .networkOff()
+  .expectJSONTypes(Joi.object().keys({
+    name: 'semver compatibility',
+    value: 'inaccessible',
+    colorB: colorsB.red
+  }));
+
+t.create('semver compatibility (invalid error)')
+  .get('/semver/invalid-manager/puma.json?style=_shields_test')
+  .expectJSONTypes(Joi.object().keys({
+    name: 'semver compatibility',
+    value: 'invalid',
+    colorB: colorsB.lightgrey
+  }));
+
+t.create('semver compatibility (invalid JSON response)')
+  .get('/semver/bundler/puma.json')
+  .intercept(nock => nock('https://api.dependabot.com')
+     .get('/badges/compatibility_score?package-manager=bundler&dependency-name=puma&version-scheme=semver')
+     .reply(invalidJSON)
+   )
+  .expectJSONTypes(Joi.object().keys({
+    name: 'semver compatibility',
+    value: 'invalid'
+  }));
+
+t.create('semver compatibility (missing dependency)')
+  .get('/semver/bundler/some-random-missing-dependency.json?style=_shields_test')
+  .expectJSONTypes(Joi.object().keys({
+    name: 'semver compatibility',
+    value: 'unknown',
+    colorB: colorsB.lightgrey
+  }));