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Namespace: Amazon.S3
Assembly: AWSSDK.dll
Version: (assembly version)
public abstract String GetPreSignedURL( GetPreSignedUrlRequest request )
The GetPreSignedUrlRequest that defines the parameters of the operation.
| Exception | Condition |
|---|---|
| System.ArgumentException | |
| System.ArgumentNullException |
When using query string authentication you create a query, specify an expiration time for the query, sign it with your signature, place the data in an HTTP request, and distribute the request to a user or embed the request in a web page.
A PreSigned URL can be generated for GET, PUT, DELETE and HEAD operations on your bucketName, keys, and versions.
The following examples show how to create various different pre-signed URLs.
The code sample shows a GetContents function. This will be referred to in subsequent samples to test out the generated URL.
public static string GetContents(string path)
{
HttpWebRequest request = HttpWebRequest.Create(path) as HttpWebRequest;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
using (Stream stream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(stream))
{
return reader.ReadToEnd();
}
}
The first example creates a URL that will allow a third party to retrieve an object from S3 for a period of 5 minutes.
// Create a client
AmazonS3Client client = new AmazonS3Client();
// Create a CopyObject request
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest
{
BucketName = "SampleBucket",
Key = "Item1",
Expires = DateTime.Now.AddMinutes(5)
};
// Get path for request
string path = client.GetPreSignedURL(request);
// Test by getting contents
string contents = GetContents(path);
The following example creates a URL that will allow a third party to retrieve an object from S3 for a period of 5 minutes, and it also sets the headers to specific content, caching and encoding values.
// Create a client
AmazonS3Client client = new AmazonS3Client();
// Create a CopyObject request
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest
{
BucketName = "SampleBucket",
Key = "Item1",
Expires = DateTime.Now.AddMinutes(5)
};
request.ResponseHeaderOverrides.ContentType = "text/xml+zip";
request.ResponseHeaderOverrides.ContentDisposition = "attachment; filename=dispName.pdf";
request.ResponseHeaderOverrides.CacheControl = "No-cache";
request.ResponseHeaderOverrides.ContentLanguage = "mi, en";
request.ResponseHeaderOverrides.Expires = "Thu, 01 Dec 1994 16:00:00 GMT";
request.ResponseHeaderOverrides.ContentEncoding = "x-gzip";
// Get path for request
string path = client.GetPreSignedURL(request);
// Test by getting contents
string contents = GetContents(path);
This example creates a URL that will allow a third party to list
all objects in a specific bucket. This URL will also expire in 5 minutes.
The URL response will be the XML response for a ListBucket request.
// Create a client
AmazonS3Client client = new AmazonS3Client();
// Create a CopyObject request
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest
{
BucketName = "SampleBucket",
Expires = DateTime.Now.AddMinutes(5)
};
// Get path for request
string path = client.GetPreSignedURL(request);
// Retrieve objects
string allObjects = GetContents(path);
This example creates a URL that will allow a third party to list
all of the owner's buckets. This URL will also expire in 5 minutes.
The URL response will be the XML response for a ListBuckets request.
// Create a client
AmazonS3Client client = new AmazonS3Client();
// Create a CopyObject request
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest
{
Expires = DateTime.Now.AddMinutes(5)
};
// Get path for request
string path = client.GetPreSignedURL(request);
// Retrieve buckets
string allBuckets = GetContents(path);
This final example creates a URL that allows a third party to put an object, then uses it to upload sample content. The URL is set to expire in 10 days.
// Create a client
AmazonS3Client client = new AmazonS3Client();
// Create a CopyObject request
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest
{
BucketName = "SampleBucket",
Key = "Item1",
Verb = HttpVerb.PUT,
Expires = DateTime.Now.AddDays(10)
};
// Get path for request
string path = client.GetPreSignedURL(request);
// Prepare data
byte[] data = UTF8Encoding.UTF8.GetBytes("Sample text.");
// Configure request
HttpWebRequest httpRequest = WebRequest.Create(path) as HttpWebRequest;
httpRequest.Method = "PUT";
httpRequest.ContentLength = data.Length;
// Write data to stream
Stream requestStream = httpRequest.GetRequestStream();
requestStream.Write(data, 0, data.Length);
requestStream.Close();
// Issue request
HttpWebResponse response = httpRequest.GetResponse() as HttpWebResponse;
.NET Framework:
Supported in: 4.5, 4.0, 3.5
.NET for Windows Store apps:
Supported in: Windows 8.1, Windows 8
.NET for Windows Phone:
Supported in: Windows Phone 8.1, Windows Phone 8