Add Cloud Speech sample.

Author: jmdobry

README.md

@@ -13,6 +13,7 @@ This repository holds Node.js samples used throughout [cloud.google.com]().
 * [Google Cloud Functions](#google-cloud-functions)
 * [Google Cloud Logging](#google-cloud-logging)
 * [Google Cloud Pub/Sub](#google-cloud-pubsub)
+* [Google Cloud Speech](#google-cloud-speech)
 * [Google Cloud Storage](#google-cloud-storage)
 * [Google Cloud Vision](#google-cloud-vision)
 * [Google Prediction API](#google-prediction-api)
@@ -103,6 +104,10 @@ __Other Examples__
 - Subscriber/Publisher sample - [Source code][pubsub_subscriber_1] | [Documentation][pubsub_subscriber_2]
 - IAM sample - [Source code][pubsub_iam_1] | [Documentation][pubsub_iam_2]
 
+## Google Cloud Speech
+
+- Recognition sample - [Source code][speech_1] | [Documentation][speech_2]
+
 ## Google Cloud Storage
 
 - Auth sample - [Source code][storage_1] | [Documentation][storage_2]
@@ -309,6 +314,9 @@ See [LICENSE](https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/ma
 [pubsub_iam_1]: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/pubsub/iam.js
 [pubsub_iam_2]: https://cloud.google.com/pubsub/access_control
 
+[speech_1]: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/speech/recognize.js
+[speech_2]: https://cloud.google.com/speech
+
 [storage_1]: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/storage/authSample.js
 [storage_2]: https://cloud.google.com/storage/docs/authentication#acd-examples
 

package.json

@@ -33,6 +33,7 @@
     "report-html": "nyc report --reporter=html",
     "deps_gce": "cd computeengine; npm i; cd ../",
     "deps_bigquery": "cd bigquery; npm i; cd ../",
+    "deps_speech": "cd speech; npm i; cd ../",
     "deps_datastore": "cd datastore; npm i; cd ../",
     "deps_pubsub": "cd pubsub; npm i; cd ../",
     "deps_monitoring": "cd monitoring; npm i; cd ../",
@@ -42,7 +43,7 @@
     "deps_vision": "cd vision; npm i; cd ../",
     "deps_functions": "cd functions/uuid; npm i; cd ../..",
     "pretest_geddy": "cd appengine/geddy; npm i geddy; GEDDY_SECRET=config/secrets.json; [[ -f $GEDDY_SECRET ]] || echo '{}' > $GEDDY_SECRET && node node_modules/.bin/geddy gen secret; cd ../..;",
-    "pretest": "npm run deps_vision; npm run deps_gce; npm run deps_bigquery; npm run deps_datastore; npm run deps_monitoring; npm run deps_storage; npm run deps_pubsub; npm run deps_prediction; npm run deps_logging; npm run deps_functions; npm run pretest_geddy",
+    "pretest": "npm run deps_vision; npm run deps_gce; npm run deps_bigquery; npm run deps_datastore; npm run deps_monitoring; npm run deps_storage; npm run deps_pubsub; npm run deps_prediction; npm run deps_logging; npm run deps_functions; npm run deps_speech; npm run pretest_geddy;",
     "test": "npm run jshint && npm run cover"
   },
   "ava": {

speech/README.md

@@ -0,0 +1,23 @@
+## Cloud Speech API samples
+
+These samples require two environment variables to be set:
+
+- `GOOGLE_APPLICATION_CREDENTIALS` - Path to a service account file. You can
+download one from your Google project's "credentials" page.
+- `GCLOUD_PROJECT` - ID of your Google project.
+
+See [gcloud-node authentication][auth] for more details.
+
+[auth]: https://googlecloudplatform.github.io/gcloud-node/#/docs/guides/authentication
+
+## Run a sample
+
+Install dependencies first:
+
+    npm install
+
+### Recognition sample
+
+Execute the sample:
+
+    node recognize "/path/to/audio.file"

speech/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "nodejs-docs-samples-speech",
+  "description": "Node.js samples for Google Cloud Speech API.",
+  "version": "0.0.1",
+  "private": true,
+  "license": "Apache Version 2.0",
+  "author": "Google Inc.",
+  "engines": {
+    "node": ">=0.10.x"
+  },
+  "scripts": {
+    "recognize": "node recognize"
+  },
+  "dependencies": {
+    "googleapis": "^6.1.0"
+  },
+  "devDependencies": {
+    "async": "^1.5.0"
+  }
+}

speech/recognize.js

@@ -0,0 +1,123 @@
+// Copyright 2015-2016, Google, Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// [START import_libraries]
+var google = require('googleapis');
+var async = require('async');
+var fs = require('fs');
+// [END import_libraries]
+
+// Url to discovery doc file
+// [START discovery_doc]
+var url = 'https://speech.googleapis.com/$discovery/rest';
+// [END discovery_doc]
+
+// [START authenticating]
+function auth(callback) {
+  google.auth.getApplicationDefault(function (err, authClient) {
+    if (err) {
+      return callback(err);
+    }
+
+    // The createScopedRequired method returns true when running on GAE or a
+    // local developer machine. In that case, the desired scopes must be passed
+    // in manually. When the code is  running in GCE or a Managed VM, the scopes
+    // are pulled from the GCE metadata server.
+    // See https://cloud.google.com/compute/docs/authentication for more
+    // information.
+    if (authClient.createScopedRequired && authClient.createScopedRequired()) {
+      // Scopes can be specified either as an array or as a single,
+      // space-delimited string.
+      authClient = authClient.createScoped([
+        'https://www.googleapis.com/auth/cloud-platform'
+      ]);
+    }
+    callback(null, authClient);
+  });
+}
+
+function getSpeechService(authClient, callback) {
+  google.discoverAPI({
+    url: url,
+    version: 'v1',
+    auth: authClient
+  }, callback);
+}
+// [END authenticating]
+
+// [START construct_request]
+function main(inputFile, callback) {
+  var authClient, audioFile;
+
+  async.waterfall([
+    function (cb) {
+      auth(cb);
+    },
+    function (_authClient, cb) {
+      authClient = _authClient;
+      readFile(inputFile, cb);
+      fs.readFile(inputFile, function (err, audioFile) {
+        if (err) {
+          return cb(err);
+        }
+        console.log('Got audio file!');
+        return cb(null, audioFile);
+      });
+    },
+    function (_audioFile, cb) {
+      audioFile = _audioFile;
+      console.log('Loading speech service...');
+      getSpeechService(authClient, cb);
+    },
+    function (speechService, cb) {
+
+      var encoded = new Buffer(audioFile).toString('base64');
+
+      console.log('Analyzing speech...');
+      speechService.speech.recognize({
+        auth: authClient,
+        resource: {
+          initialRequest: {
+            encoding: 'LINEAR16',
+            sampleRate: 16000
+          },
+          audioRequest: {
+            content: encoded
+          }
+        }
+      }, cb);
+    }
+  ], function (err, result) {
+    if (err) {
+      return callback(err);
+    }
+    console.log('result:', JSON.stringify(result, null, 2));
+    callback(null, result);
+  });
+}
+// [END construct_request]
+
+exports.main = main;
+
+// [START run_application]
+if (module === require.main) {
+  if (process.argv.length < 3) {
+    console.log('Usage: node recognize <inputFile>');
+    process.exit();
+  }
+  var inputFile = process.argv[3];
+  main(inputFile, console.log);
+}
+// [END run_application]

speech/resources/audio.raw

@@ -0,0 +1,32 @@
+// Copyright 2016, Google, Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+var test = require('ava');
+var path = require('path');
+var recognizeExample = require('../../speech/recognize');
+
+test.cb('should list entries', function (t) {
+  recognizeExample.main(
+    path.resolve('../../speech/resources/audio.raw'),
+    function (err, result) {
+      t.ifError(err);
+      t.ok(result);
+      t.ok(result.responses);
+      t.is(result.responses.length, 1);
+      t.ok(result.responses[0].results);
+      t.end();
+    }
+  );
+});