Torch Object Storage
Torch Object Storage
Torch Object Storage
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Signature Mechanism
The header contains a signature
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01-SERVICE_ERROR
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- Documentation
Torch Object StorageSDK ReferenceC++Pre-signature MechanismPre-signed POST Form (C++ SDK)
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Download PDFPre-signature Mechanism
Pre-signed POST Form (C++ SDK)
Copy pageDownload PDFPre-signed POST Form (C++ SDK)
TOS supports browser-based POST object upload requests, enabling you to upload content directly to TOS. When uploading an object using POST, you must include signature information in the form.
Pre-signed POST form with basic parameters
The following code is used for POST form-based pre-signed object uploads that include only basic parameters.
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void)
{
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
std::string objectName = "exampledir/exampleobject.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
int64_t expires = 86400;
PreSignedPostSignatureInput input(bucketName,objectName, expires);
auto output = client.preSignedPostSignature(input);
if(!output.isSuccess()){
std::cout << "GeneratePreSignedUrl failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
auto res = output.result();
std::cout << "GeneratePreSignedUrl Success:" << "\n"
<< "Policy: " << res.getPolicy() << "\n"
<< "Algorithm: " << res.getAlgorithm() << "\n"
<< "Credential: " << res.getCredential() << "\n"
<< "Date: " << res.getDate() << "\n"
<< "OriginPolicy: " << res.getOriginPolicy() << "\n"
<< "Signature: " << res.getSignature() << "\n";
CloseClient();
return 0;
}
Pre-signed POST with multiple form fields
The following code is an example of uploading objects with multiple form fields.
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void)
{
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
std::string objectName = "exampledir/exampleobject.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
int64_t expires = 86400;
PreSignedPostSignatureInput input(bucketName,objectName, expires);
input.setConditions(
{PostSignatureCondition("x-tos-acl", "public-read"),
PostSignatureCondition("key", "sdktest", std::make_shared<std::string>("starts-with"))});
input.setContentLengthRange(std::make_shared<ContentLengthRange>(50, 1025));
auto output = client.preSignedPostSignature(input);
if(!output.isSuccess()){
std::cout << "GeneratePreSignedUrl failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
auto res = output.result();
std::cout << "GeneratePreSignedUrl Success:" << "\n"
<< "Policy: " << res.getPolicy() << "\n"
<< "Algorithm: " << res.getAlgorithm() << "\n"
<< "Credential: " << res.getCredential() << "\n"
<< "Date: " << res.getDate() << "\n"
<< "OriginPolicy: " << res.getOriginPolicy() << "\n"
<< "Signature: " << res.getSignature() << "\n";
CloseClient();
return 0;
}
Relevant Documentation
For detailed information about POST form presigning, see Including a signature in browser-based upload forms.
Last updated: 2025.09.25 14:22:44
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