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An example of Rackspace Cloud Files Temp URL.
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Everett Toews committed Feb 27, 2013
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/**
* Licensed to jclouds, Inc. (jclouds) under one or more
* contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. jclouds licenses this file
* to you 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.
*/
package org.jclouds.examples.rackspace.cloudfiles;

import static com.google.common.io.Closeables.closeQuietly;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;

import org.jclouds.ContextBuilder;
import org.jclouds.blobstore.BlobStore;
import org.jclouds.blobstore.BlobStoreContext;
import org.jclouds.blobstore.domain.Blob;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.HttpResponseException;
import org.jclouds.util.Strings2;

import com.google.common.base.Charsets;
import com.google.common.io.Files;

/**
* The Temporary URL feature (TempURL) allows you to create limited-time Internet addresses which allow you to grant
* limited access to your Cloud Files account. Using TempURL, you may allow others to retrieve or place objects in
* your Cloud Files account for as long or as short a time as you wish. Access to the TempURL is independent of
* whether or not your account is CDN-enabled. And even if you don't CDN-enable a directory, you can still grant
* temporary public access through a TempURL.
*
* This feature is useful if you want to allow a limited audience to download a file from your Cloud Files account or
* website. You can give out the TempURL and know that after a specified time, no one will be able to access your
* object through the address. Or, if you want to allow your audience to upload objects into your Cloud Files account,
* you can give them a TempURL. After the specified time expires, no one will be able to upload to the address.
*
* Additionally, you need not worry about time running out when someone downloads a large object. If the time expires
* while a file is being retrieved, the download will continue until it is finished. Only the link will expire.
*
* @author Everett Toews
*/
public class GenerateTempURL implements Closeable {
private static final String FILENAME = "object.txt";
private static final int TEN_MINUTES = 10 * 60;

private BlobStore storage;
private BlobStoreContext storageContext;

/**
* To get a username and API key see http://www.jclouds.org/documentation/quickstart/rackspace/
*
* The first argument (args[0]) must be your username
* The second argument (args[1]) must be your API key
*/
public static void main(String[] args) {
GenerateTempURL generateTempURL = new GenerateTempURL();

try {
generateTempURL.init(args);
generateTempURL.generatePutTempURL();
generateTempURL.generateGetTempURL();
generateTempURL.generateDeleteTempURL();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
generateTempURL.close();
}
}

private void init(String[] args) {
// The provider configures jclouds To use the Rackspace Cloud (US)
// To use the Rackspace Cloud (UK) set the provider to "cloudfiles-uk"
String provider = "cloudfiles-us";

String username = args[0];
String apiKey = args[1];

storageContext = ContextBuilder.newBuilder(provider)
.credentials(username, apiKey)
.buildView(BlobStoreContext.class);
storage = storageContext.getBlobStore();
}

private void generatePutTempURL() throws IOException {
System.out.println("Generate PUT Temp URL");

String payload = "This object will be public for 10 minutes.";
Blob blob = storage.blobBuilder(FILENAME).payload(payload).contentType("text/plain").build();
HttpRequest request = storageContext.getSigner().signPutBlob(Constants.CONTAINER, blob, TEN_MINUTES);

System.out.println(" " + request.getMethod() + " " + request.getEndpoint());

// PUT the file using jclouds
HttpResponse response = storageContext.utils().http().invoke(request);
int statusCode = response.getStatusCode();

if (statusCode >= 200 && statusCode < 299) {
System.out.println(" PUT Success (" + statusCode + ")");
}
else {
throw new HttpResponseException(null, response);
}
}

private void generateGetTempURL() throws IOException {
System.out.println("Generate GET Temp URL");

HttpRequest request = storageContext.getSigner().signGetBlob(Constants.CONTAINER, FILENAME, TEN_MINUTES);

System.out.println(" " + request.getMethod() + " " + request.getEndpoint());

// GET the file using jclouds
File file = File.createTempFile(FILENAME, ".tmp");
String content = Strings2.toString(storageContext.utils().http().invoke(request).getPayload());
Files.write(content, file, Charsets.UTF_8);

System.out.println(" GET Success (" + file.getAbsolutePath() + ")");
}

private void generateDeleteTempURL() throws IOException {
System.out.println("Generate DELETE Temp URL");

HttpRequest request = storageContext.getSigner().signRemoveBlob(Constants.CONTAINER, FILENAME);

System.out.println(" " + request.getMethod() + " " + request.getEndpoint());

// DELETE the file using jclouds
HttpResponse response = storageContext.utils().http().invoke(request);
int statusCode = response.getStatusCode();

if (statusCode >= 200 && statusCode < 299) {
System.out.println(" DELETE Success (" + statusCode + ")");
}
else {
throw new HttpResponseException(null, response);
}
}

/**
* Always close your service when you're done with it.
*/
public void close() {
closeQuietly(storage.getContext());
}
}

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