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* Copyright 2016 Google Inc. All Rights Reserved.
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for t`he specific language governing permissions and
* limitations under the License.
'use strict';
const functions = require('firebase-functions');
const mkdirp = require('mkdirp-promise');
const gcs = require('@google-cloud/storage')();
const vision = require('@google-cloud/vision')();
const spawn = require('child-process-promise').spawn;
const path = require('path');
const os = require('os');
const fs = require('fs');
* When an image is uploaded we check if it is flagged as Adult or Violence by the Cloud Vision
* API and if it is we blur it using ImageMagick.
exports.blurOffensiveImages = => {
const file = gcs.bucket(object.bucket).file(;
// Check the image content using the Cloud Vision API.
return vision.detectSafeSearch(file).then((data) => {
const safeSearch = data[0];
console.log('SafeSearch results on image', safeSearch);
if ( || safeSearch.violence) {
return blurImage(, object.bucket, object.metadata);
return null;
* Blurs the given image located in the given bucket using ImageMagick.
function blurImage(filePath, bucketName, metadata) {
const tempLocalFile = path.join(os.tmpdir(), filePath);
const tempLocalDir = path.dirname(tempLocalFile);
const bucket = gcs.bucket(bucketName);
// Create the temp directory where the storage file will be downloaded.
return mkdirp(tempLocalDir).then(() => {
console.log('Temporary directory has been created', tempLocalDir);
// Download file from bucket.
return bucket.file(filePath).download({destination: tempLocalFile});
}).then(() => {
console.log('The file has been downloaded to', tempLocalFile);
// Blur the image using ImageMagick.
return spawn('convert', [tempLocalFile, '-channel', 'RGBA', '-blur', '0x8', tempLocalFile]);
}).then(() => {
console.log('Blurred image created at', tempLocalFile);
// Uploading the Blurred image.
return bucket.upload(tempLocalFile, {
destination: filePath,
metadata: {metadata: metadata}, // Keeping custom metadata.
}).then(() => {
console.log('Blurred image uploaded to Storage at', filePath);
return console.log('Deleted local file', filePath);