Add GoogleProvider plugin

Author: pmuens

provider/googleProvider.js

@@ -0,0 +1,97 @@
+'use strict';
+
+const BbPromise = require('bluebird');
+const _ = require('lodash');
+
+const constants = {
+  providerName: 'google',
+};
+
+class GoogleProvider {
+  static getProviderName() {
+    return constants.providerName;
+  }
+
+  constructor(serverless) {
+    this.serverless = serverless;
+    this.provider = this; // only load plugin in a Google service context
+    this.serverless.setProvider(constants.providerName, this);
+
+    /* eslint-disable global-require */
+    const GoogleCloud = require('google-cloud')({
+      projectId: this.serverless.service.provider.project,
+      keyFilename: this.serverless.service.provider.credentials,
+    });
+
+    const Google = require('googleapis');
+    /* eslint-enable global-require */
+
+    this.sdk = {
+      Google,
+      GoogleCloud,
+    };
+  }
+
+  request(service, method, params) {
+    // use googleapis for functions because it's not supported in the SDK right now
+    if (service === 'functions') {
+      return this.googleCloudFunctionsWrapper(method, params);
+    }
+
+    const googleCloudService = this.sdk.GoogleCloud[service]();
+
+    return new BbPromise((resolve, reject) => {
+      googleCloudService[method](params, (error, data) => {
+        if (error) {
+          reject(new this.serverless.classes.Error(error.message, error.statusCode));
+        } else {
+          resolve(data);
+        }
+      });
+    });
+  }
+
+  /* eslint-disable no-shadow */
+  googleCloudFunctionsWrapper(method, params) {
+    const discoveryURL = 'https://cloudfunctions.googleapis.com/$discovery/rest?version=v1beta2';
+    // eslint-disable-next-line global-require
+    const key = require(this.serverless.service.provider.credentials);
+
+    return new BbPromise((resolve, reject) => {
+      const authClient = new this.sdk.Google.auth.JWT(
+        key.client_email,
+        null,
+        key.private_key,
+        ['https://www.googleapis.com/auth/cloud-platform'],
+        null
+      );
+
+      this.sdk.Google.discoverAPI(discoveryURL, (error, functions) => {
+        authClient.authorize((error) => {
+          if (error) {
+            reject(new this.serverless.classes.Error(error.message, error.statusCode));
+          }
+
+          const auth = authClient;
+          const functionParams = {
+            auth,
+          };
+
+          // merge the params from the request call into the base functionParams
+          _.merge(functionParams, params);
+
+          functions.projects.locations.functions[method](functionParams, (error, body) => {
+            if (error) {
+              reject(new this.serverless.classes.Error(error.message, error.statusCode));
+            } else {
+              resolve(body);
+            }
+          });
+        });
+      });
+    });
+  }
+  /* eslint-enable no-shadow */
+}
+
+module.exports = GoogleProvider;