Using a Temporary URL for Authorized Access

If you have any questions during development, post them on the Issues page of GitHub. For details about parameters and usage of each API, see the API Reference.

Use the Method parameter to specify the HTTP request method, the Expires parameter to specify the validity period (in seconds) of the URL, the Headers parameter to specify the request headers, the SpecialParam parameter to specify the special operators, and the QueryParams parameter to specify the query parameters.

ObsClient allows you to create a URL whose Query parameters are carried with authentication information by specifying the AK and SK, HTTP method, and request parameters. You can provide other users with this URL for temporary access. When generating a URL, you need to specify the validity period of the URL to restrict the access duration of visitors.

If you want to grant other users the permission to perform other operations on buckets or objects (for example, upload or download objects), generate a URL with the corresponding request (for example, to upload an object using the URL that generates the PUT request) and provide the URL for other users.

The following table lists operations can be performed through a signed URL.

Operation	HTTP Request Method	Special Operator (Sub-resource)	Bucket Name Required	Object Name Required
PUT Bucket	PUT	N/A	Yes	No
GET Buckets	GET	N/A	No	No
DELETE Bucket	DELETE	N/A	Yes	No
GET Objects	GET	N/A	Yes	No
GET Object versions	GET	versions	Yes	No
List Multipart uploads	GET	uploads	Yes	No
Obtain Bucket Metadata	HEAD	N/A	Yes	No
GET Bucket location	GET	location	Yes	No
GET Bucket storageinfo	GET	storageinfo	Yes	No
PUT Bucket quota	PUT	quota	Yes	No
GET Bucket quota	GET	quota	Yes	No
Set Bucket storagePolicy	PUT	storagePolicy	Yes	No
GET Bucket storagePolicy	GET	storagePolicy	Yes	No
PUT Bucket acl	PUT	acl	Yes	No
GET Bucket acl	GET	acl	Yes	No
PUT Bucket logging	PUT	logging	Yes	No
GET Bucket logging	GET	logging	Yes	No
PUT Bucket policy	PUT	policy	Yes	No
GET Bucket policy	GET	policy	Yes	No
DELETE Bucket policy	DELETE	policy	Yes	No
PUT Bucket lifecycle	PUT	lifecycle	Yes	No
GET Bucket lifecycle	GET	lifecycle	Yes	No
DELETE Bucket lifecycle	DELETE	lifecycle	Yes	No
PUT Bucket website	PUT	website	Yes	No
GET Bucket website	GET	website	Yes	No
DELETE Bucket website	DELETE	website	Yes	No
PUT Bucket versioning	PUT	versioning	Yes	No
GET Bucket versioning	GET	versioning	Yes	No
PUT Bucket cors	PUT	cors	Yes	No
GET Bucket cors	GET	cors	Yes	No
DELETE Bucket cors	DELETE	cors	Yes	No
PUT Bucket tagging	PUT	tagging	Yes	No
GET Bucket tagging	GET	tagging	Yes	No
DELETE Bucket tagging	DELETE	tagging	Yes	No
PUT Object	PUT	N/A	Yes	Yes
Append Object	POST	append	Yes	Yes
GET Object	GET	N/A	Yes	Yes
PUT Object - Copy	PUT	N/A	Yes	Yes
DELETE Object	DELETE	N/A	Yes	Yes
DELETE Objects	POST	delete	Yes	Yes
Obtain Object Metadata	HEAD	N/A	Yes	Yes
PUT Object acl	PUT	acl	Yes	Yes
GET Object acl	GET	acl	Yes	Yes
Initiate Multipart Upload	POST	uploads	Yes	Yes
PUT Part	PUT	N/A	Yes	Yes
PUT Part - Copy	PUT	N/A	Yes	Yes
List Parts	GET	N/A	Yes	Yes
Complete Multipart Upload	POST	N/A	Yes	Yes
DELETE Multipart upload	DELETE	N/A	Yes	Yes
POST Object restore	POST	restore	Yes	Yes

To access OBS using a temporary URL generated by the OBS Node.js SDK, perform the following steps:

Call ObsClient.createSignedUrlSync to generate a signed URL.
Use any HTTP library to make an HTTP/HTTPS request to OBS.

If a CORS or signature mismatch error occurs, refer to the following steps to troubleshoot the issue:

If CORS is not configured, you need to configure CORS rules on OBS Console. For details, see Configuring CORS.
If the signatures do not match, check whether signature parameters are correct by referring to Authentication of Signature in a URL. For example, during an object upload, the backend uses Content-Type to calculate the signature and generate an authorized URL, but if Content-Type is not set or set incorrectly when the frontend uses the authorized URL, a CORS error occurs. To avoid this issue, ensure that Content-Type fields at both the frontend and backend are kept consistent.

The following content provides examples of accessing OBS using a temporary URL, including bucket creation, as well as object upload, download, listing, and deletion.

Creating a Bucket

// Import the OBS library.
// Use npm to install the client.
var ObsClient = require('esdk-obs-nodejs');
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');
var https = require('https');
var urlLib = require('url');
var crypto = require('crypto');

// Create an ObsClient instance.
var obsClient = new ObsClient({
       //Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
       //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
       access_key_id: process.env.ACCESS_KEY_ID,
       secret_access_key: process.env.SECRET_ACCESS_KEY,
       server : 'https://your-endpoint'
});

let bucketName = 'bucketname';
let method = 'PUT';
let res = obsClient.createSignedUrlSync({Method : method, Bucket : bucketName});
let location = 'your-location';
let content  = `<CreateBucketConfiguration><LocationConstraint>${location}</LocationConstraint></CreateBucketConfiguration>`;

// Make a PUT request to create a bucket.
var url = urlLib.parse(res.SignedUrl);
var req = https.request({
       method : method,
       host : url.hostname,
       port : url.port,
       path : url.path,
       rejectUnauthorized : false,
       headers : res.ActualSignedRequestHeaders || {}
});


console.log('Creating bucket using url:' + res.SignedUrl);

req.on('response',   (serverback) => {
       var buffers = [];
       serverback.on('data', (data) => {
              buffers.push(data);
       }).on('end', () => {
              
              if(serverback.statusCode < 300){
                     console.log('Creating bucket using temporary signature succeed.');
              }else{
                     console.log('Creating bucket using temporary signature failed!');
                     console.log('status:' + serverback.statusCode);
                     console.log('\n');
              }
              buffers = Buffer.concat(buffers);
              if(buffers.length > 0){
                     console.log(buffers.toString());
              }
              console.log('\n');
       });
}).on('error',(err) => {
       console.log('Creating bucket using temporary signature failed!');
       console.log(err);
       console.log('\n');
});

if(content){
       req.write(content);
}
req.end();

Uploading an Object

// Import the OBS library.
// Use npm to install the client.
var ObsClient = require('esdk-obs-nodejs');
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');
var https = require('https');
var urlLib = require('url');
var crypto = require('crypto');

// Create an ObsClient instance.
var obsClient = new ObsClient({
       //Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
       //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
       access_key_id: process.env.ACCESS_KEY_ID,
       secret_access_key: process.env.SECRET_ACCESS_KEY,
       server : 'https://your-endpoint'
});

let bucketName = 'bucketname';
let objectKey = 'objectname';
let method = 'PUT';
let res = obsClient.createSignedUrlSync({Method : method, Bucket : bucketName, Key: objectKey, Expires: 3600});
let content  = 'Hello OBS';

//Make a PUT request to upload an object.
var url = urlLib.parse(res.SignedUrl);
var req = https.request({
       method : method,
       host : url.hostname,
       port : url.port,
       path : url.path,
       rejectUnauthorized : false,
       headers : res.ActualSignedRequestHeaders || {}
});


console.log('Creating object using url:' + res.SignedUrl);

req.on('response',   (serverback) => {
       var buffers = [];
       serverback.on('data', (data) => {
              buffers.push(data);
       }).on('end', () => {
              
              if(serverback.statusCode < 300){
                     console.log('Creating object using temporary signature succeed.');
              }else{
                     console.log('Creating object using temporary signature failed!');
                     console.log('status:' + serverback.statusCode);
                     console.log('\n');
              }
              buffers = Buffer.concat(buffers);
              if(buffers.length > 0){
                     console.log(buffers.toString());
              }
              console.log('\n');
       });
}).on('error',(err) => {
       console.log('Creating object using temporary signature failed!');
       console.log(err);
       console.log('\n');
});

if(content){
       req.write(content);
}
req.end();

Downloading an Object

// Import the OBS library.
// Use npm to install the client.
var ObsClient = require('esdk-obs-nodejs');
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');
var https = require('https');
var urlLib = require('url');
var crypto = require('crypto');

// Create an ObsClient instance.
var obsClient = new ObsClient({
       //Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
       //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
       access_key_id: process.env.ACCESS_KEY_ID,
       secret_access_key: process.env.SECRET_ACCESS_KEY,
       server : 'https://your-endpoint'
});

let bucketName = 'bucketname';
let objectKey = 'objectname';
let method = 'GET';
let res = obsClient.createSignedUrlSync({Method : method, Bucket : bucketName, Key: objectKey, Expires: 3600});

//Make a GET request to download an object.
var url = urlLib.parse(res.SignedUrl);
var req = https.request({
       method : method,
       host : url.hostname,
       port : url.port,
       path : url.path,
       rejectUnauthorized : false,
       headers : res.ActualSignedRequestHeaders || {}
});


console.log('Creating object using url:' + res.SignedUrl);

req.on('response',   (serverback) => {
       var buffers = [];
       serverback.on('data', (data) => {
              buffers.push(data);
       }).on('end', () => {
              
              if(serverback.statusCode < 300){
                     console.log('Getting object using temporary signature succeed.');
              }else{
                     console.log('Getting object using temporary signature failed!');
                     console.log('status:' + serverback.statusCode);
                     console.log('\n');
              }
              buffers = Buffer.concat(buffers);
              if(buffers.length > 0){
                     console.log(buffers.toString());
              }
              console.log('\n');
       });
}).on('error',(err) => {
       console.log('Getting object using temporary signature failed!');
       console.log(err);
       console.log('\n');
});

req.end();

Listing Objects

// Import the OBS library.
// Use npm to install the client.
var ObsClient = require('esdk-obs-nodejs');
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');
var https = require('https');
var urlLib = require('url');
var crypto = require('crypto');

// Create an ObsClient instance.
var obsClient = new ObsClient({
       //Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
       //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
       access_key_id: process.env.ACCESS_KEY_ID,
       secret_access_key: process.env.SECRET_ACCESS_KEY,
       server : 'https://your-endpoint'
});

let bucketName = 'bucketname';
let method = 'GET';
let res = obsClient.createSignedUrlSync({Method : method, Bucket : bucketName, Expires: 3600});

// Make a GET request to obtain the object list.
var url = urlLib.parse(res.SignedUrl);
var req = https.request({
       method : method,
       host : url.hostname,
       port : url.port,
       path : url.path,
       rejectUnauthorized : false,
       headers : res.ActualSignedRequestHeaders || {}
});


console.log('Listing object using url:' + res.SignedUrl);

req.on('response',   (serverback) => {
       var buffers = [];
       serverback.on('data', (data) => {
              buffers.push(data);
       }).on('end', () => {
              
              if(serverback.statusCode < 300){
                     console.log('Listing object using temporary signature succeed.');
              }else{
                     console.log('Listing object using temporary signature failed!');
                     console.log('status:' + serverback.statusCode);
                     console.log('\n');
              }
              buffers = Buffer.concat(buffers);
              if(buffers.length > 0){
                     console.log(buffers.toString());
              }
              console.log('\n');
       });
}).on('error',(err) => {
       console.log('Listing object using temporary signature failed!');
       console.log(err);
       console.log('\n');
});

req.end();

Deleting an Object

// Import the OBS library.
// Use npm to install the client.
var ObsClient = require('esdk-obs-nodejs');
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');
var https = require('https');
var urlLib = require('url');
var crypto = require('crypto');

// Create an ObsClient instance.
var obsClient = new ObsClient({
       //Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
       //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
       access_key_id: process.env.ACCESS_KEY_ID,
       secret_access_key: process.env.SECRET_ACCESS_KEY,
       server : 'https://your-endpoint'
});

let bucketName = 'bucketname';
let objectKey = 'objectname';
let method = 'DELETE';
let res = obsClient.createSignedUrlSync({Method : method, Bucket : bucketName, Key: objectKey, Expires: 3600});

// Make a DELETE request to delete the object.
var url = urlLib.parse(res.SignedUrl);
var req = https.request({
       method : method,
       host : url.hostname,
       port : url.port,
       path : url.path,
       rejectUnauthorized : false,
       headers : res.ActualSignedRequestHeaders || {}
});


console.log('Deleting object using url:' + res.SignedUrl);

req.on('response',   (serverback) => {
       var buffers = [];
       serverback.on('data', (data) => {
              buffers.push(data);
       }).on('end', () => {
              
              if(serverback.statusCode < 300){
                     console.log('Deleting object using temporary signature succeed.');
              }else{
                     console.log('Deleting object using temporary signature failed!');
                     console.log('status:' + serverback.statusCode);
                     console.log('\n');
              }
              buffers = Buffer.concat(buffers);
              if(buffers.length > 0){
                     console.log(buffers.toString());
              }
              console.log('\n');
       });
}).on('error',(err) => {
       console.log('Deleting object using temporary signature failed!');
       console.log(err);
       console.log('\n');
});

req.end();

Parent topic: Temporarily Authorized Access

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