我正在尝试为Google云存储中的私人存储文件创建签名;这样我就可以分发一个有时间限制的链接。
目前正在这样做,它的签名太短了......我哪里错了?
var crypto = require("crypto");
var ttl = new Date().getTime() + 3600;
var id = 'the_target_file.txt';
var bucketName = 'bucket_name';
var POLICY_JSON = "GET\n" + "\n" + "\n" + ttl + "\n" + '/' + bucketName + '/' + id;
// stringify and encode the policy
var stringPolicy = JSON.stringify(POLICY_JSON);
var base64Policy = Buffer(stringPolicy, "utf-8").toString("base64");
// sign the base64 encoded policy
var privateKey = "MY_PRIVATE_KEY";
var sha256 = crypto.createHmac("sha256", privateKey);
var signature = sha256.update(new Buffer(base64Policy, "utf-8")).digest("base64");
console.log ( signature );
答案 0 :(得分:17)
意识到我做错了什么......我正在对策略字符串进行哈希处理而不是签名。 下面的代码现在给我正确的输出。
var crypto = require("crypto");
var fs = require("fs");
var expiry = new Date().getTime() + 3600;
var key = 'the_target_file';
var bucketName = 'bucket_name';
var accessId = 'my_access_id';
var stringPolicy = "GET\n" + "\n" + "\n" + expiry + "\n" + '/' + bucketName + '/' + key;
var privateKey = fs.readFileSync("gcs.pem","utf8");
var signature = encodeURIComponent(crypto.createSign('sha256').update(stringPolicy).sign(privateKey,"base64"));
var signedUrl = "https://" + bucketName + ".commondatastorage.googleapis.com/" + key +"?GoogleAccessId=" + accessId + "&Expires=" + expiry + "&Signature=" + signature;
console.log(signedUrl);
为了完整性......这是一个PHP版本,它做同样的事情,我用来检查我的结果
$expiry = time() + 3600;
$key = 'the_target_file';
$bucketName = 'bucket_name';
$accessId = 'my_access_id';
$stringPolicy = "GET\n\n\n".$expiry."\n/".$bucketName."/".$key;
$fp = fopen('gcs.pem', 'r');
$priv_key = fread($fp, 8192);
fclose($fp);
$pkeyid = openssl_get_privatekey($priv_key,"password");
if (openssl_sign( $stringPolicy, $signature, $pkeyid, 'sha256' )) {
$signature = urlencode( base64_encode( $signature ) );
echo 'https://'.$bucketName.'.commondatastorage.googleapis.com/'.
$key.'?GoogleAccessId='.$accessId.'&Expires='.$expiry.'&Signature='.$signature;
}
答案 1 :(得分:8)
现在有一个用于获取签名网址的API /模块。
模块:https://www.npmjs.com/package/@google-cloud/storage
API文档:https://cloud.google.com/nodejs/docs/reference/storage/1.6.x/File#getSignedUrl
实施例
var storage = require('@google-cloud/storage')();
var myBucket = storage.bucket('my-bucket');
var file = myBucket.file('my-file');
//-
// Generate a URL that allows temporary access to download your file.
//-
var request = require('request');
var config = {
action: 'read',
expires: '03-17-2025'
};
file.getSignedUrl(config, function(err, url) {
if (err) {
console.error(err);
return;
}
// The file is now available to read from this URL.
request(url, function(err, resp) {
// resp.statusCode = 200
});
});
答案 2 :(得分:1)
如果 nodejs @google-cloud/storage
库已经是您项目的一部分,那么最好的方法是使用它。下面的代码是由 google storage sdk docs for nodejs Link here
npm install @google-cloud/storage
function main(bucketName = 'you_bucket_name', filename = 'your_file_path_without_bucket_name') {
const {Storage} = require('@google-cloud/storage');
// Creates a client (Parameters not required if you are already in GCP environment)
const storage = new Storage({
projectId: 'your_project_id',
keyFilename: './json_key_path_for_some_service_account.json'
});
async function generateV4ReadSignedUrl() {
// These options will allow temporary read access to the file
const options = {
version: 'v4',
action: 'read',
expires: Date.now() + 15 * 60 * 1000, // 15 minutes
};
// Get a v4 signed URL for reading the file
const [url] = await storage
.bucket(bucketName)
.file(filename)
.getSignedUrl(options);
console.log('Generated GET signed URL:');
console.log(url);
console.log('You can use this URL with any user agent, for example:');
console.log(`curl '${url}'`);
}
generateV4ReadSignedUrl().catch(console.error);
// [END storage_generate_signed_url_v4]
}
main(...process.argv.slice(2));
答案 3 :(得分:0)
假设此问题是对由Google bucket后端支持的CDN URL进行签名,那么这里对我有用(上面的代码对我无效)。
调用选项和签名功能:
const signUrlOptions = {
expires: '' + new Date().getTime() + 3600, // one hour
keyName: '_SIGNING_KEY_NAME_', // URL signing key name (the one one you created in the CDN backend bucket)
keyBase64: '_SIGNING_KEY_BASE64_', // the URL signing key base64 content (base64-encoded, 128-bit value, ~24 characters)
baseUrl: '_CDN_BASE_URL_' // your base CDN URL (can be IP http://123.... when dev env or https://cdn_dns_name or https dns name)
}
const signedUrl = signCdnUrl('demo.png', signedUrlOptions);
签名功能:
import { createHmac } from 'crypto';
const BASE64_REPLACE = { '+': '-', '/': '_', '=': '' };
export function signCdnUrl(fileName, opts) {
// URL to sign
const urlToSign = `${opts.baseUrl}/${fileName}?Expires=${opts.expires}&KeyName=${opts.keyName}`;
// Compute signature
const keyBuffer = Buffer.from(opts.keyBase64, 'base64');
let signature = createHmac('sha1', keyBuffer).update(urlToSign).digest('base64');
signature = signature.replace(/[+/=]/g, c => (<any>BASE64_REPLACE)[c]); // might be a better way
// Add signature to urlToSign and return signedUrl
return urlToSign + `&Signature=${signature}`;
}
希望这会有所帮助。谷歌云文档以某种方式没有nodejs示例,并且file.getSignedUrl()给混合添加了混乱,因为它似乎与CDN URL签名无关。
注意:
注意:可能想将bases->缓冲工作作为opts.keyBuffer移至调用方