There are more AWS SDK examples available in the [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub repo.

# Create signed URLs and cookies using an AWS SDK
<a name="cloudfront_example_cloudfront_CloudFrontUtilities_section"></a>

The following code example shows how to create signed URLs and cookies that allow access to restricted resources.

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#### [ Java ]

**SDK for Java 2.x**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/cloudfront#code-examples). 
Use the [CannedSignerRequest](https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/cloudfront/model/CannedSignerRequest.html) class to sign URLs or cookies with a *canned* policy.  

```
import software.amazon.awssdk.services.cloudfront.model.CannedSignerRequest;

import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Instant;
import java.time.temporal.ChronoUnit;

public class CreateCannedPolicyRequest {

    public static CannedSignerRequest createRequestForCannedPolicy(String distributionDomainName,
            String fileNameToUpload,
            String privateKeyFullPath, String publicKeyId) throws Exception {
        String protocol = "https";
        String resourcePath = "/" + fileNameToUpload;

        String cloudFrontUrl = new URL(protocol, distributionDomainName, resourcePath).toString();
        Instant expirationDate = Instant.now().plus(7, ChronoUnit.DAYS);
        Path path = Paths.get(privateKeyFullPath);

        return CannedSignerRequest.builder()
                .resourceUrl(cloudFrontUrl)
                .privateKey(path)
                .keyPairId(publicKeyId)
                .expirationDate(expirationDate)
                .build();
    }
}
```
Use the [CustomSignerRequest](https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/cloudfront/model/CustomSignerRequest.html) class to sign URLs or cookies with a *custom* policy. The `activeDate` and `ipRange` are optional methods.  

```
import software.amazon.awssdk.services.cloudfront.model.CustomSignerRequest;

import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Instant;
import java.time.temporal.ChronoUnit;

public class CreateCustomPolicyRequest {

    public static CustomSignerRequest createRequestForCustomPolicy(String distributionDomainName,
            String fileNameToUpload,
            String privateKeyFullPath, String publicKeyId) throws Exception {
        String protocol = "https";
        String resourcePath = "/" + fileNameToUpload;

        String cloudFrontUrl = new URL(protocol, distributionDomainName, resourcePath).toString();
        Instant expireDate = Instant.now().plus(7, ChronoUnit.DAYS);
        // URL will be accessible tomorrow using the signed URL.
        Instant activeDate = Instant.now().plus(1, ChronoUnit.DAYS);
        Path path = Paths.get(privateKeyFullPath);

        return CustomSignerRequest.builder()
                .resourceUrl(cloudFrontUrl)
                // .resourceUrlPattern("https://*.example.com/*")  // Optional.
                .privateKey(path)
                .keyPairId(publicKeyId)
                .expirationDate(expireDate)
                .activeDate(activeDate) // Optional.
                // .ipRange("192.168.0.1/24") // Optional.
                .build();
    }
}
```
The following example demonstrates the use of the [CloudFrontUtilities](https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/cloudfront/CloudFrontUtilities.html) class to produce signed cookies and URLs. [View](https://github.com/awsdocs/aws-doc-sdk-examples/blob/main/javav2/example_code/cloudfront/src/main/java/com/example/cloudfront/SigningUtilities.java) this code example on GitHub.  

```
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.services.cloudfront.CloudFrontUtilities;
import software.amazon.awssdk.services.cloudfront.cookie.CookiesForCannedPolicy;
import software.amazon.awssdk.services.cloudfront.cookie.CookiesForCustomPolicy;
import software.amazon.awssdk.services.cloudfront.model.CannedSignerRequest;
import software.amazon.awssdk.services.cloudfront.model.CustomSignerRequest;
import software.amazon.awssdk.services.cloudfront.url.SignedUrl;

public class SigningUtilities {
    private static final Logger logger = LoggerFactory.getLogger(SigningUtilities.class);
    private static final CloudFrontUtilities cloudFrontUtilities = CloudFrontUtilities.create();

    public static SignedUrl signUrlForCannedPolicy(CannedSignerRequest cannedSignerRequest) {
        SignedUrl signedUrl = cloudFrontUtilities.getSignedUrlWithCannedPolicy(cannedSignerRequest);
        logger.info("Signed URL: [{}]", signedUrl.url());
        return signedUrl;
    }

    public static SignedUrl signUrlForCustomPolicy(CustomSignerRequest customSignerRequest) {
        SignedUrl signedUrl = cloudFrontUtilities.getSignedUrlWithCustomPolicy(customSignerRequest);
        logger.info("Signed URL: [{}]", signedUrl.url());
        return signedUrl;
    }

    public static CookiesForCannedPolicy getCookiesForCannedPolicy(CannedSignerRequest cannedSignerRequest) {
        CookiesForCannedPolicy cookiesForCannedPolicy = cloudFrontUtilities
                .getCookiesForCannedPolicy(cannedSignerRequest);
        logger.info("Cookie EXPIRES header [{}]", cookiesForCannedPolicy.expiresHeaderValue());
        logger.info("Cookie KEYPAIR header [{}]", cookiesForCannedPolicy.keyPairIdHeaderValue());
        logger.info("Cookie SIGNATURE header [{}]", cookiesForCannedPolicy.signatureHeaderValue());
        return cookiesForCannedPolicy;
    }

    public static CookiesForCustomPolicy getCookiesForCustomPolicy(CustomSignerRequest customSignerRequest) {
        CookiesForCustomPolicy cookiesForCustomPolicy = cloudFrontUtilities
                .getCookiesForCustomPolicy(customSignerRequest);
        logger.info("Cookie POLICY header [{}]", cookiesForCustomPolicy.policyHeaderValue());
        logger.info("Cookie KEYPAIR header [{}]", cookiesForCustomPolicy.keyPairIdHeaderValue());
        logger.info("Cookie SIGNATURE header [{}]", cookiesForCustomPolicy.signatureHeaderValue());
        return cookiesForCustomPolicy;
    }
}
```
+  For API details, see [CloudFrontUtilities](https://docs.aws.amazon.com/goto/SdkForJavaV2/cloudfront-2020-05-31/CloudFrontUtilities) in *AWS SDK for Java 2.x API Reference*. 

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