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Accessing OBS Using a Temporary URL

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

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 (Value in OBS Java SDK)	Special Operator (Value in OBS Java SDK)	Bucket Name Required	Object Name Required
PUT Bucket	HttpMethodEnum.PUT	N/A	Yes	No
GET Buckets	HttpMethodEnum.GET	N/A	No	No
DELETE Bucket	HttpMethodEnum.DELETE	N/A	Yes	No
GET Objects	HttpMethodEnum.GET	N/A	Yes	No
GET Object versions	HttpMethodEnum.GET	SpecialParamEnum.VERSIONS	Yes	No
List Multipart uploads	HttpMethodEnum.GET	SpecialParamEnum.UPLOADS	Yes	No
Obtain Bucket Metadata	HttpMethodEnum.HEAD	N/A	Yes	No
GET Bucket location	HttpMethodEnum.GET	SpecialParamEnum.LOCATION	Yes	No
GET Bucket storageinfo	HttpMethodEnum.GET	SpecialParamEnum.STORAGEINFO	Yes	No
PUT Bucket quota	HttpMethodEnum.PUT	SpecialParamEnum.QUOTA	Yes	No
GET Bucket quota	HttpMethodEnum.GET	SpecialParamEnum.QUOTA	Yes	No
PUT Bucket storagePolicy	HttpMethodEnum.PUT	SpecialParamEnum.STORAGEPOLICY	Yes	No
GET Bucket storagePolicy	HttpMethodEnum.GET	SpecialParamEnum.STORAGEPOLICY	Yes	No
PUT Bucket acl	HttpMethodEnum.PUT	SpecialParamEnum.ACL	Yes	No
GET Bucket acl	HttpMethodEnum.GET	SpecialParamEnum.ACL	Yes	No
PUT Bucket logging	HttpMethodEnum.PUT	SpecialParamEnum.LOGGING	Yes	No
GET Bucket logging	HttpMethodEnum.GET	SpecialParamEnum.LOGGING	Yes	No
PUT Bucket policy	HttpMethodEnum.PUT	SpecialParamEnum.POLICY	Yes	No
GET Bucket policy	HttpMethodEnum.GET	SpecialParamEnum.POLICY	Yes	No
DELETE Bucket policy	HttpMethodEnum.DELETE	SpecialParamEnum.POLICY	Yes	No
PUT Bucket lifecycle	HttpMethodEnum.PUT	SpecialParamEnum.LIFECYCLE	Yes	No
GET Bucket lifecycle	HttpMethodEnum.GET	SpecialParamEnum.LIFECYCLE	Yes	No
DELETE Bucket lifecycle	HttpMethodEnum.DELETE	SpecialParamEnum.LIFECYCLE	Yes	No
PUT Bucket website	HttpMethodEnum.PUT	SpecialParamEnum.WEBSITE	Yes	No
GET Bucket website	HttpMethodEnum.GET	SpecialParamEnum.WEBSITE	Yes	No
DELETE Bucket website	HttpMethodEnum.DELETE	SpecialParamEnum.WEBSITE	Yes	No
PUT Bucket versioning	HttpMethodEnum.PUT	SpecialParamEnum.VERSIONING	Yes	No
GET Bucket versioning	HttpMethodEnum.GET	SpecialParamEnum.VERSIONING	Yes	No
PUT Bucket cors	HttpMethodEnum.PUT	SpecialParamEnum.CORS	Yes	No
GET Bucket cors	HttpMethodEnum.GET	SpecialParamEnum.CORS	Yes	No
DELETE Bucket cors	HttpMethodEnum.DELETE	SpecialParamEnum.CORS	Yes	No
PUT Bucket notification	HttpMethodEnum.PUT	SpecialParamEnum.NOTIFICATION	Yes	No
GET Bucket notification	HttpMethodEnum.GET	SpecialParamEnum.NOTIFICATION	Yes	No
PUT Bucket tagging	HttpMethodEnum.PUT	SpecialParamEnum.TAGGING	Yes	No
GET Bucket tagging	HttpMethodEnum.GET	SpecialParamEnum.TAGGING	Yes	No
DELETE Bucket tagging	HttpMethodEnum.DELETE	SpecialParamEnum.TAGGING	Yes	No
PUT Object	HttpMethodEnum.PUT	N/A	Yes	Yes
Append Object	HttpMethodEnum.POST	SpecialParamEnum.APPEND	Yes	Yes
GET Object	HttpMethodEnum.GET	N/A	Yes	Yes
PUT Object - Copy	HttpMethodEnum.PUT	N/A	Yes	Yes
DELETE Object	HttpMethodEnum.DELETE	N/A	Yes	Yes
DELETE Objects	HttpMethodEnum.POST	SpecialParamEnum.DELETE	Yes	Yes
Obtain Object Metadata	HttpMethodEnum.HEAD	N/A	Yes	Yes
PUT Object acl	HttpMethodEnum.PUT	SpecialParamEnum.ACL	Yes	Yes
GET Object acl	HttpMethodEnum.GET	SpecialParamEnum.ACL	Yes	Yes
Initiate Multipart Upload	HttpMethodEnum.POST	SpecialParamEnum.UPLOADS	Yes	Yes
PUT Part	HttpMethodEnum.PUT	N/A	Yes	Yes
PUT Part - Copy	HttpMethodEnum.PUT	N/A	Yes	Yes
List Parts	HttpMethodEnum.GET	N/A	Yes	Yes
Complete Multipart Upload	HttpMethodEnum.POST	N/A	Yes	Yes
DELETE Multipart Upload	HttpMethodEnum.DELETE	N/A	Yes	Yes
POST Object restore	HttpMethodEnum.POST	SpecialParamEnum.RESTORE	Yes	Yes

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

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

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

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, expireSeconds);
request.setBucketName("bucketname");
TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
System.out.println("Creating bucket using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());

Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}
// Make a PUT request to create a bucket.
String location = "your bucket location";
Request httpRequest = builder.url(response.getSignedUrl()).put(RequestBody.create(null, "<CreateBucketConfiguration><Location>" + location + "</Location></CreateBucketConfiguration>".getBytes())).build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Uploading an Object

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

Map<String, String> headers = new HashMap<String, String>();
String contentType = "text/plain";
headers.put("Content-Type", contentType);

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");
request.setHeaders(headers);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("Creating object using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());
Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

//Make a PUT request to upload an object.
Request httpRequest = builder.url(response.getSignedUrl()).put(RequestBody.create(MediaType.parse(contentType), "Hello OBS".getBytes("UTF-8"))).build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Downloading an Object

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;


TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("Getting object using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());
Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

//Make a GET request to download an object.
Request httpRequest = builder.url(response.getSignedUrl()).get().build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Listing Objects

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;


TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
request.setBucketName("bucketname");

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("Getting object list using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());
Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

//Make a GET request to obtain the object list.
Request httpRequest = builder.url(response.getSignedUrl()).get().build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Deleting an Object

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;


TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.DELETE, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("Deleting object using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());
Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

//Make a DELETE request to delete an object.
Request httpRequest = builder.url(response.getSignedUrl()).delete().build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Initiating Multipart Upload

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.POST, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");
request.setSpecialParam(SpecialParamEnum.UPLOADS);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("initiate multipart upload using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());

Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

// POST a request to initialize a multipart upload.
Request httpRequest = builder.url(response.getSignedUrl()).post(RequestBody.create(null, "")).build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Uploading Parts

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");

Map<String, Object> queryParams = new HashMap<String, Object>();
// Set the partNumber parameter, for example, queryParams.put("partNumber", "1").
queryParams.put("partNumber", "partNumber");
queryParams.put("uploadId", "your uploadId");

request.setQueryParams(queryParams);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("upload part using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());

Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

// PUT a request to upload object parts.
Request httpRequest = builder.url(response.getSignedUrl()).put(RequestBody.create(null, new byte[6 * 1024 * 1024])).build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Listing Uploaded Parts

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");

Map<String, Object> queryParams = new HashMap<String, Object>();
queryParams.put("uploadId", "your uploadId");
request.setQueryParams(queryParams);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("list parts using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());

Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

// Make a GET request to list uploaded parts.
Request httpRequest = builder.url(response.getSignedUrl()).get().build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Merging Uploaded Parts

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.POST, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");

Map<String, String> headers = new HashMap<String, String>();
String contentType = "application/xml";
headers.put("Content-Type", contentType);
request.setHeaders(headers);

Map<String, Object> queryParams = new HashMap<String, Object>();
queryParams.put("uploadId", "your uploadId");
request.setQueryParams(queryParams);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("complete multipart upload using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());

Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

// The following content is an example code. You need to assemble the following content by listing the response results of the uploaded parts.
String content = "<CompleteMultipartUpload>";
content += "<Part>";
content += "<PartNumber>1</PartNumber>";
content += "<ETag>da6a0d097e307ac52ed9b4ad551801fc</ETag>";
content += "</Part>";
content += "<Part>";
content += "<PartNumber>2</PartNumber>";
content += "<ETag>da6a0d097e307ac52ed9b4ad551801fc</ETag>";
content += "</Part>";
content += "</CompleteMultipartUpload>";

// POST a request to merge uploaded parts.
Request httpRequest = builder.url(response.getSignedUrl()).post(RequestBody.create(MediaType.parse(contentType), content.getBytes("UTF-8"))).build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

Obtains the download link of image processing.

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;


TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");

// Set the parameters for image processing.

Map<String,Object> queryParams = new HashMap<String, Object>();
queryParams.put("x-image-process", "image/resize,m_fixed,w_100,h_100/rotate,100");
request.setQueryParams(queryParams);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
// Obtain the download link that supports image processing.
System.out.println("Getting object using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());
res.close();

Downloading an SSE-C Encrypted Object

String endPoint = "http://your-endpoint";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

ObsConfiguration config = new ObsConfiguration();
config.setSocketTimeout(30000);
config.setConnectionTimeout(10000);
config.setEndPoint(endPoint);
// Create an instance of ObsClient.
ObsClient obsClient = new ObsClient(ak, sk, config);
// Specify the validity period of the URL to 3600 seconds.
long expireSeconds = 3600L;

TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.GET, expireSeconds);
request.setBucketName("bucketname");
request.setObjectKey("objectname");
// Set SSE-C encryption headers.
Map<String, String> headers = new HashMap<String, String>();
headers.put("x-obs-server-side-encryption-customer-algorithm", "AES256");
// Set the encryption key. This header is a 256-bit key with Base64 encoding.
headers.put("x-obs-server-side-encryption-customer-key", "your base64 sse-c key generated by AES-256 algorithm");
// Set the MD5 value of the encryption key. This header is a 128-bit MD5 value with Base64 encoding.
headers.put("x-obs-server-side-encryption-customer-key-MD5", "the md5 value of your sse-c key");
request.setHeaders(headers);

TemporarySignatureResponse response = obsClient.createTemporarySignature(request);

System.out.println("Getting object using temporary signature url:");
System.out.println("\t" + response.getSignedUrl());
Request.Builder builder = new Request.Builder();
for (Map.Entry<String, String> entry : response.getActualSignedRequestHeaders().entrySet()) {
       builder.header(entry.getKey(), entry.getValue());
}

//Make a GET request to download an object.
Request httpRequest = builder.url(response.getSignedUrl()).get().build();
OkHttpClient httpClient = new OkHttpClient.Builder().followRedirects(false).retryOnConnectionFailure(false)
              .cache(null).build();

Call c = httpClient.newCall(httpRequest);
Response res = c.execute();
System.out.println("\tStatus:" + res.code());
if (res.body() != null) {
       System.out.println("\tContent:" + res.body().string() + "\n");
}
res.close();

HttpMethodEnum is an enumeration function defined in OBS Java SDK, whose value indicates the request method types.

For details about the encryption key algorithm, see How Do I Generate an SSE-C Encryption Key?.

Parent topic: Temporarily Authorized Access

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Help Center

Accessing OBS Using a Temporary URL

Creating a Bucket

Uploading an Object

Downloading an Object

Listing Objects

Deleting an Object

Initiating Multipart Upload

Uploading Parts

Listing Uploaded Parts

Merging Uploaded Parts

Obtains the download link of image processing.

Downloading an SSE-C Encrypted Object