feat: support apiEndpoint override

package.json

@@ -35,7 +35,7 @@
     "predocs-test": "npm run docs"
   },
   "dependencies": {
-    "@google-cloud/common": "^1.0.0",
+    "@google-cloud/common": "^2.0.0",
     "@google-cloud/paginator": "^1.0.0",
     "@google-cloud/projectify": "^1.0.0",
     "@google-cloud/promisify": "^1.0.0",
@@ -54,15 +54,15 @@
     "eslint-config-prettier": "^4.0.0",
     "eslint-plugin-node": "^9.0.0",
     "eslint-plugin-prettier": "^3.0.0",
-    "jsdoc-baseline": "^0.1.0",
     "intelli-espower-loader": "^1.0.1",
     "jsdoc": "^3.6.2",
+    "jsdoc-baseline": "^0.1.0",
+    "linkinator": "^1.4.2",
     "mocha": "^6.0.0",
     "nyc": "^14.0.0",
     "power-assert": "^1.5.0",
     "prettier": "^1.13.5",
     "proxyquire": "^2.0.1",
-    "uuid": "^3.2.1",
-    "linkinator": "^1.1.2"
+    "uuid": "^3.2.1"
   }
 }

src/index.js

@@ -58,6 +58,7 @@ const Image = require('./image.js');
  *     attempted before returning the error.
  * @property {Constructor} [promise] Custom promise module to use instead of
  *     native Promises.
+ * @property {string} [apiEndpoint] The API endpoint of the service used to make requests. Defaults to `www.googleapis.com`
  */
 /**
  * @see [What is Google Compute Engine?]{@link https://cloud.google.com/compute/docs}
@@ -78,10 +79,11 @@ const Image = require('./image.js');
  * });
  */
 class Compute extends common.Service {
-  constructor(options) {
-    options = options || {};
+  constructor(options = {}) {
+    options.apiEndpoint = options.apiEndpoint || 'www.googleapis.com';
     const config = {
-      baseUrl: 'https://www.googleapis.com/compute/v1',
+      apiEndpoint: options.apiEndpoint,
+      baseUrl: `https://${options.apiEndpoint}/compute/v1`,
       scopes: ['https://www.googleapis.com/auth/compute'],
       packageJson: require('../package.json'),
     };

src/service.js

@@ -286,7 +286,7 @@ class Service extends common.ServiceObject {
   getHealth(group, callback) {
     if (!is.string(group)) {
       group = format('{baseUrl}/projects/{p}/zones/{z}/instanceGroups/{n}', {
-        baseUrl: 'https://www.googleapis.com/compute/v1',
+        baseUrl: `https://${this.compute.apiEndpoint}/compute/v1`,
         p: this.parent.projectId,
         z: group.zone.name || group.zone,
         n: group.name,

src/snapshot.js

@@ -124,10 +124,12 @@ class Snapshot extends common.ServiceObject {
        */
       getMetadata: true,
     };
+    const compute = isDisk ? scope.zone.compute : scope;
     const config = {
       parent: scope,
-      baseUrl:
-        'https://www.googleapis.com/compute/v1/projects/{{projectId}}/global/snapshots',
+      baseUrl: `https://${
+        compute.apiEndpoint
+      }/compute/v1/projects/{{projectId}}/global/snapshots`,
       /**
        * @name Snapshot#id
        * @type {string}
@@ -174,7 +176,7 @@ class Snapshot extends common.ServiceObject {
      * @name Snapshot#compute
      * @type {Compute}
      */
-    this.compute = isDisk ? scope.zone.compute : scope;
+    this.compute = compute;
     /**
      * @name Snapshot#name
      * @type {string}

src/vm.js

@@ -240,7 +240,7 @@ class VM extends common.ServiceObject {
     this.hasActiveWaiters = false;
     this.waiters = [];
     this.url = format('{base}/{project}/zones/{zone}/instances/{name}', {
-      base: 'https://www.googleapis.com/compute/v1/projects',
+      base: `https://${this.zone.compute.apiEndpoint}/compute/v1/projects`,
       project: zone.compute.projectId,
       zone: zone.name,
       name: this.name,
@@ -422,7 +422,7 @@ class VM extends common.ServiceObject {
         }
         const diskName = replaceProjectIdToken(disk.formattedName, projectId);
         let deviceName;
-        const baseUrl = 'https://www.googleapis.com/compute/v1/';
+        const baseUrl = `https://${self.zone.compute.apiEndpoint}/compute/v1/`;
         const disks = metadata.disks || [];
         // Try to find the deviceName by matching the source of the attached disks
         // to the name of the disk provided by the user.

test/service.js

@@ -46,6 +46,7 @@ describe('Service', function() {
   const COMPUTE = {
     projectId: 'project-id',
     createService: util.noop,
+    apiEndpoint: 'www.googleapis.com',
   };
 
   before(function() {

test/snapshot.js

@@ -41,7 +41,9 @@ describe('Snapshot', function() {
   let Snapshot;
   let snapshot;
 
-  const COMPUTE = {};
+  const COMPUTE = {
+    apiEndpoint: 'www.googleapis.com',
+  };
   const SNAPSHOT_NAME = 'snapshot-name';
 
   before(function() {

test/vm.js

@@ -62,6 +62,7 @@ describe('VM', function() {
       },
     },
     projectId: 'project-id',
+    apiEndpoint: 'www.googleapis.com',
   };
   const ZONE = {
     compute: COMPUTE,