Add DLP image redaction sample (Take 2) (#441)

* Add DLP image redaction sample

* Fix lint

dlp/redact.js

@@ -64,6 +64,59 @@ function redactString (string, replaceString, minLikelihood, infoTypes) {
   // [END redact_string]
 }
 
+function redactImage (filepath, minLikelihood, infoTypes, outputPath) {
+  // [START redact_image]
+  // Imports required Node.js libraries
+  const mime = require('mime');
+  const fs = require('fs');
+
+  // Imports the Google Cloud Data Loss Prevention library
+  const DLP = require('@google-cloud/dlp');
+
+  // Instantiates a client
+  const dlp = DLP();
+
+  // The path to a local file to inspect. Can be a JPG or PNG image file.
+  // const fileName = 'path/to/image.png';
+
+  // The minimum likelihood required before redacting a match
+  // const minLikelihood = LIKELIHOOD_UNSPECIFIED;
+
+  // The infoTypes of information to redact
+  // const infoTypes = ['EMAIL_ADDRESS', 'PHONE_NUMBER'];
+
+  // The local path to save the resulting image to.
+  // const outputPath = 'result.png';
+
+  const fileItems = [{
+    type: mime.lookup(filepath) || 'application/octet-stream',
+    data: Buffer.from(fs.readFileSync(filepath)).toString('base64')
+  }];
+
+  const imageRedactionConfigs = infoTypes.map((infoType) => {
+    return { infoType: infoType };
+  });
+
+  const request = {
+    inspectConfig: {
+      minLikelihood: minLikelihood
+    },
+    imageRedactionConfigs: imageRedactionConfigs,
+    items: fileItems
+  };
+
+  dlp.redactContent(request)
+    .then((response) => {
+      const image = response[0].items[0].data;
+      fs.writeFileSync(outputPath, image);
+      console.log(`Saved image redaction results to path: ${outputPath}`);
+    })
+    .catch((err) => {
+      console.log(`Error in redactImage: ${err.message || err}`);
+    });
+  // [END redact_image]
+}
+
 const cli = require(`yargs`)
   .demand(1)
   .command(
@@ -72,6 +125,12 @@ const cli = require(`yargs`)
     {},
     (opts) => redactString(opts.string, opts.replaceString, opts.minLikelihood, opts.infoTypes)
   )
+  .command(
+    `image <filepath> <outputPath>`,
+    `Redact sensitive data from an image using the Data Loss Prevention API.`,
+    {},
+    (opts) => redactImage(opts.filepath, opts.minLikelihood, opts.infoTypes, opts.outputPath)
+  )
   .option('m', {
     alias: 'minLikelihood',
     default: 'LIKELIHOOD_UNSPECIFIED',
@@ -96,6 +155,7 @@ const cli = require(`yargs`)
     })
   })
   .example(`node $0 string "My name is Gary" "REDACTED" -t US_MALE_NAME`)
+  .example(`node $0 image resources/test.png redaction_result.png -t US_MALE_NAME`)
   .wrap(120)
   .recommendCommands()
   .epilogue(`For more information, see https://cloud.google.com/dlp/docs. Optional flags are explained at https://cloud.google.com/dlp/docs/reference/rest/v2beta1/content/inspect#InspectConfig`);

dlp/system-test/redact.test.js

@@ -17,20 +17,24 @@
 
 const path = require('path');
 const test = require('ava');
+const fs = require('fs');
 const tools = require('@google-cloud/nodejs-repo-tools');
 
 const cmd = 'node redact';
 const cwd = path.join(__dirname, `..`);
 
+const testImage = 'resources/test.png';
+const testResourcePath = 'system-test/resources';
+
 test.before(tools.checkCredentials);
 
 // redact_string
-test(`should redact sensitive data from a string`, async (t) => {
+test(`should redact multiple sensitive data types from a string`, async (t) => {
   const output = await tools.runAsync(`${cmd} string "I am Gary and my phone number is (123) 456-7890." REDACTED -t US_MALE_NAME PHONE_NUMBER`, cwd);
   t.is(output, 'I am REDACTED and my phone number is REDACTED.');
 });
 
-test(`should ignore unspecified type names when redacting from a string`, async (t) => {
+test(`should redact a single sensitive data type from a string`, async (t) => {
   const output = await tools.runAsync(`${cmd} string "I am Gary and my phone number is (123) 456-7890." REDACTED -t PHONE_NUMBER`, cwd);
   t.is(output, 'I am Gary and my phone number is REDACTED.');
 });
@@ -40,6 +44,34 @@ test(`should report string redaction handling errors`, async (t) => {
   t.regex(output, /Error in redactString/);
 });
 
+// redact_image
+test(`should redact a single sensitive data type from an image`, async (t) => {
+  const testName = `redact-multiple-types`;
+  const output = await tools.runAsync(`${cmd} image ${testImage} ${testName}.result.png -t PHONE_NUMBER EMAIL_ADDRESS`, cwd);
+
+  t.true(output.includes(`Saved image redaction results to path: ${testName}.result.png`));
+
+  const correct = fs.readFileSync(`${testResourcePath}/${testName}.correct.png`);
+  const result = fs.readFileSync(`${testName}.result.png`);
+  t.deepEqual(correct, result);
+});
+
+test(`should redact multiple sensitive data types from an image`, async (t) => {
+  const testName = `redact-single-type`;
+  const output = await tools.runAsync(`${cmd} image ${testImage} ${testName}.result.png -t PHONE_NUMBER`, cwd);
+
+  t.true(output.includes(`Saved image redaction results to path: ${testName}.result.png`));
+
+  const correct = fs.readFileSync(`${testResourcePath}/${testName}.correct.png`);
+  const result = fs.readFileSync(`${testName}.result.png`);
+  t.deepEqual(correct, result);
+});
+
+test(`should report image redaction handling errors`, async (t) => {
+  const output = await tools.runAsync(`${cmd} image ${testImage} nonexistent.result.png -t BAD_TYPE`, cwd);
+  t.regex(output, /Error in redactImage/);
+});
+
 // CLI options
 test(`should have a minLikelihood option`, async (t) => {
   const promiseA = tools.runAsync(`${cmd} string "My phone number is (123) 456-7890." REDACTED -t PHONE_NUMBER -m VERY_LIKELY`, cwd);