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Generate Pre-signed Object URL using AWS SDK for .NET
The following tasks guide you through using the .NET classes to generate a pre-signed URL.
Downloading Objects
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1 |
Create an instance of the |
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2 |
Execute the You provide information including a bucket name, an object key, and an expiration
date by creating an instance of the
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The following C# code sample demonstrates the preceding tasks.
static AmazonS3 client;
client = Amazon.AWSClientFactory.CreateAmazonS3Client(
accessKeyID, secretAccessKeyID);
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest();
request.WithBucketName(bucketName);
request.WithKey(objectKey);
request.Verb = HttpVerb.GET; // Default.
request.WithExpires(DateTime.Now.AddMinutes(5));
string url = s3Client.GetPreSignedURL(request);Example
The following C# code example generates a pre-signed URL for a specific object. For instructions about how to create and test a working sample, see Testing the .NET Code Examples
using System;
using System.Configuration;
using System.Collections.Specialized;
using Amazon.S3;
using Amazon.S3.Model;
namespace s3.amazon.com.docsamples.presignedurl
{
class S3Sample
{
static string bucketName = "*** Provide a bucket name ***";
static string objectKey = "*** Provide an object name ***";
static AmazonS3 s3Client;
public static void Main(string[] args)
{
NameValueCollection appConfig = ConfigurationManager.AppSettings;
string accessKeyID = appConfig["AWSAccessKey"];
string secretAccessKeyID = appConfig["AWSSecretKey"];
using (s3Client = Amazon.AWSClientFactory.CreateAmazonS3Client(
accessKeyID, secretAccessKeyID))
{
GeneratePreSignedURL();
}
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
static void GeneratePreSignedURL()
{
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest();
request.WithBucketName(bucketName);
request.WithKey(objectKey);
request.WithExpires(DateTime.Now.AddMinutes(5));
try
{
string url = s3Client.GetPreSignedURL(request);
}
catch (AmazonS3Exception amazonS3Exception)
{
if (amazonS3Exception.ErrorCode != null &&
(amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId")
||
amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
{
Console.WriteLine("Check the provided AWS Credentials.");
Console.WriteLine(
"To sign up for service, go to http://aws.amazon.com/s3");
}
else
{
Console.WriteLine(
"Error occurred. Message:'{0}' when listing objects",
amazonS3Exception.Message);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
}
