/
generateV4SignedPolicy.js
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generateV4SignedPolicy.js
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// Copyright 2020 Google LLC
//
// 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.
/**
* This application demonstrates how to perform basic operations on files with
* the Google Cloud Storage API.
*
* For more information, see the README.md under /storage and the documentation
* at https://cloud.google.com/storage/docs.
*/
function main(bucketName = 'my-bucket', filename = 'test.txt') {
// [START storage_generate_post_policy_url_v4]
/**
* TODO(developer): Uncomment the following lines before running the sample.
*/
// const bucketName = 'Name of a bucket, e.g. my-bucket';
// const filename = 'File to access, e.g. file.txt';
// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');
// Creates a client
const storage = new Storage();
async function generateV4SignedPolicy() {
const bucket = storage.bucket(bucketName);
const file = bucket.file(filename);
// These options will allow temporary uploading of a file
// through an HTML form.
const expires = Date.now() + 10 * 60 * 1000; // 10 minutes
const options = {
expires,
fields: {'x-goog-meta-test': 'data'},
};
// Get a v4 signed policy for uploading file
const [response] = await file.generateSignedPostPolicyV4(options);
// Create an HTML form with the provided policy
let output = `<form action='${response.url}' method='POST' enctype="multipart/form-data">\n`;
// Include all fields returned in the HTML form as they're required
for (const name of Object.keys(response.fields)) {
const value = response.fields[name];
output += ` <input name='${name}' value='${value}' type='hidden'/>\n`;
}
output += " <input type='file' name='file'/><br />\n";
output +=
" <input type='submit' value='Upload File' name='submit'/><br />\n";
output += '</form>';
console.log(output);
}
generateV4SignedPolicy().catch(console.error);
// [END storage_generate_post_policy_url_v4]
}
main(...process.argv.slice(2));