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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
# include <iostream>
# include <fstream>
# include <aws/core/Aws.h>
# include <aws/core/http/HttpClient.h>
# include <aws/core/client/AWSUrlPresigner.h>
# include <aws/core/client/RetryStrategy.h>
# include <aws/s3/S3Client.h>
# include <aws/s3/model/PutObjectRequest.h>
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# include "s3_examples.h"
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// The libcurl must be installed to test the pre-signed URL returned in this example.
// See, https://curl.se/libcurl/c/libcurl.html.
# if HAS_CURL
# include <curl/curl.h>
# endif
/**
* Before running this C++ code example, set up your development environment, including your credentials.
*
* For more information, see the following documentation topic:
*
* https://docs.aws.amazon.com/sdk-for-cpp/v1/developer-guide/getting-started.html
*
* For information on the structure of the code examples and how to build and run the examples, see
* https://docs.aws.amazon.com/sdk-for-cpp/v1/developer-guide/getting-started-code-examples.html.
*
**/
// snippet-start:[cpp.example_code.s3.presigned.GetObject]
//! Routine which demonstrates creating a pre-signed URL to download an object from an
//! Amazon Simple Storage Service (Amazon S3) bucket.
/*!
\param bucketName: Name of the bucket.
\param key: Name of an object key.
\param expirationSeconds: Expiration in seconds for pre-signed URL.
\param clientConfig: Aws client configuration.
\return Aws::String: A pre-signed URL.
*/
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Aws : : String AwsDoc : : S3 : : generatePreSignedGetObjectUrl ( const Aws : : String & bucketName ,
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const Aws : : String & key ,
uint64_t expirationSeconds ,
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const Aws : : S3 : : S3ClientConfiguration & clientConfig ) {
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Aws : : S3 : : S3Client client ( clientConfig ) ;
return client . GeneratePresignedUrl ( bucketName , key , Aws : : Http : : HttpMethod : : HTTP_GET ,
expirationSeconds ) ;
}
// snippet-end:[cpp.example_code.s3.presigned.GetObject]
# if HAS_CURL
// snippet-start:[cpp.example_code.s3.presigned.GetObjectDownload]
static size_t myCurlWriteBack ( char * buffer , size_t size , size_t nitems , void * userdata ) {
Aws : : StringStream * str = ( Aws : : StringStream * ) userdata ;
if ( nitems > 0 ) {
str - > write ( buffer , size * nitems ) ;
}
return size * nitems ;
}
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//! Utility routine to test getObject with a pre-signed URL.
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/*!
\param presignedURL: A pre-signed URL to get an object from a bucket.
\param resultString: A string to hold the result.
\return bool: Function succeeded.
*/
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bool AwsDoc : : S3 : : getObjectWithPresignedObjectUrl ( const Aws : : String & presignedURL ,
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Aws : : String & resultString ) {
CURL * curl = curl_easy_init ( ) ;
CURLcode result ;
std : : stringstream outWriteString ;
result = curl_easy_setopt ( curl , CURLOPT_WRITEDATA , & outWriteString ) ;
if ( result ! = CURLE_OK ) {
std : : cerr < < " Failed to set CURLOPT_WRITEDATA " < < std : : endl ;
return false ;
}
result = curl_easy_setopt ( curl , CURLOPT_WRITEFUNCTION , myCurlWriteBack ) ;
if ( result ! = CURLE_OK ) {
std : : cerr < < " Failed to set CURLOPT_WRITEFUNCTION " < < std : : endl ;
return false ;
}
result = curl_easy_setopt ( curl , CURLOPT_URL , presignedURL . c_str ( ) ) ;
if ( result ! = CURLE_OK ) {
std : : cerr < < " Failed to set CURLOPT_URL " < < std : : endl ;
return false ;
}
result = curl_easy_perform ( curl ) ;
if ( result ! = CURLE_OK ) {
std : : cerr < < " Failed to perform CURL request " < < std : : endl ;
return false ;
}
resultString = outWriteString . str ( ) ;
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if ( resultString . find ( " <?xml " ) = = 0 ) {
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std : : cerr < < " Failed to get object, response: \n " < < resultString < < std : : endl ;
return false ;
}
return true ;
}
// snippet-end:[cpp.example_code.s3.presigned.GetObjectDownload]
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# endif // HAS_CURL
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/*
*
* main function
*
* Prerequisites: An existing bucket with an object.
*
* Usage: 'run_presigned_get_object <bucket_name> <object_key>'
*
*/
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# ifndef EXCLUDE_MAIN_FUNCTION
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int main ( int argc , char * * argv ) {
if ( argc ! = 3 ) {
std : : cout < < R " (
Usage :
run_presigned_get_object < bucket_name > < object_key >
Where :
bucket_name - Name of S3 bucket .
< object_key > - An object key .
) " << std::endl;
return 1 ;
}
Aws : : SDKOptions options ;
Aws : : InitAPI ( options ) ;
{
Aws : : String bucketName ( argv [ 1 ] ) ;
Aws : : String objectKey ( argv [ 2 ] ) ;
uint64_t presignedSecondsTimeout = 10 * 60 ;
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Aws : : S3 : : S3ClientConfiguration clientConfig ;
Aws : : String presignedUrl = AwsDoc : : S3 : : generatePreSignedGetObjectUrl ( bucketName ,
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objectKey ,
presignedSecondsTimeout ,
clientConfig ) ;
std : : cout < < " Presigned URL: \n " < < presignedUrl < < std : : endl ;
# if HAS_CURL
Aws : : String resultString ;
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AwsDoc : : S3 : : getObjectWithPresignedObjectUrl ( presignedUrl , resultString ) ;
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std : : cout < < " Result: \n " < < resultString < < std : : endl ;
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# endif // HAS_CURL
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}
ShutdownAPI ( options ) ;
return 0 ;
}
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# endif // EXCLUDE_MAIN_FUNCTION
