Overview

This document provides an overview of SDK code samples related to generating pre-signed object URLs.

SDK API Reference

For the parameters and method descriptions of all the APIs in the SDK, see Api Documentation.

Generating a Pre-Signed Object URL

Sample 1. Generating a pre-signed upload URL

try
{
 PreSignatureStruct preSignatureStruct = new PreSignatureStruct();
 preSignatureStruct.appid = "1250000000";// APPID of your Tencent Cloud account
 preSignatureStruct.region = "COS_REGION"; // Bucket region
 preSignatureStruct.bucket = "examplebucket-1250000000"; // Bucket
 preSignatureStruct.key = "exampleobject"; // Object key
 preSignatureStruct.httpMethod = "PUT"; // HTTP request method
 preSignatureStruct.isHttps = true; // Generate an HTTPS request URL
 preSignatureStruct.signDurationSecond = 600; //The duration of a request signature is 600 s
 preSignatureStruct.headers = null;// Headers to verify in the signature
 preSignatureStruct.queryParameters = null; // URL request parameters to verify in the signature
  // A pre-signed URL for upload (calculated with your permanent key)
 string requestSignURL = cosXml.GenerateSignURL(preSignatureStruct);
  string srcPath = @"temp-source-file";// Absolute path to the local file
 PutObjectRequest request = new PutObjectRequest(null, null, srcPath);
 // Set the pre-signed URL for upload requests
 request.RequestURLWithSign = requestSignURL;
 // Set progress callback
 request.SetCosProgressCallback(delegate (long completed, long total)
 {
   Console.WriteLine(String.Format("progress = {0:##.##}%", completed * 100.0 / total));
 });
 // Execute the request
 PutObjectResult result = cosXml.PutObject(request);
 // Request succeeded
 Console.WriteLine(result.GetResultInfo());
}
catch (COSXML.CosException.CosClientException clientEx)
{
 // Request failed
 Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
 // Request failed
 Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}

Note：

For the complete sample, go to GitHub.

Sample 2. Generating a pre-signed download URL

try
{
 PreSignatureStruct preSignatureStruct = new PreSignatureStruct();
 preSignatureStruct.appid = "1250000000";// APPID of your Tencent Cloud account
 preSignatureStruct.region = "COS_REGION"; // Bucket region
 preSignatureStruct.bucket = "examplebucket-1250000000"; // Bucket
 preSignatureStruct.key = "exampleobject"; // Object key
 preSignatureStruct.httpMethod = "GET"; // HTTP request method
 preSignatureStruct.isHttps = true; // Generate an HTTPS request URL
 preSignatureStruct.signDurationSecond = 600; //The duration of a request signature is 600 s
 preSignatureStruct.headers = null;// Headers to verify in the signature
 preSignatureStruct.queryParameters = null; // URL request parameters to verify in the signature
  string requestSignURL = cosXml.GenerateSignURL(preSignatureStruct); 
  // Pre-signed URL for download requests (calculated with your permanent key)
 string localDir = System.IO.Path.GetTempPath();// Local file directory
 string localFileName = "my-local-temp-file"; // Specify the name of the file to be saved locally
 GetObjectRequest request = new GetObjectRequest(null, null, localDir, localFileName);
 // Set the pre-signed URL for download requests
 request.RequestURLWithSign = requestSignURL;
 // Set progress callback
 request.SetCosProgressCallback(delegate (long completed, long total)
 {
   Console.WriteLine(String.Format("progress = {0:##.##}%", completed * 100.0 / total));
 });
 // Execute the request
 GetObjectResult result = cosXml.GetObject(request);
 // Request succeeded
 Console.WriteLine(result.GetResultInfo());
}
catch (COSXML.CosException.CosClientException clientEx)
{
 // Request failed
 Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
 // Request failed
 Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}

Note：

For the complete sample, go to GitHub.