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(C) (using AWS Signature Version 2) Streaming Download to FileThe main purpose of this example is to demonstrate how to use the older Signature Version 2 authentication w/ S3. It uses V2 authentication to download a file.
#include <C_CkRest.h> #include <C_CkAuthAws.h> #include <C_CkStream.h> void ChilkatSample(void) { HCkRest rest; BOOL bTls; int port; BOOL bAutoReconnect; BOOL success; HCkAuthAws authAws; int responseStatusCode; HCkStream bodyStream; const char *errResponse; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest = CkRest_Create(); // Connect to the Amazon AWS REST server. bTls = TRUE; port = 443; bAutoReconnect = TRUE; // The file is located in the bucket named "chilkat100", which becomes part of the domain: success = CkRest_Connect(rest,"chilkat100.s3.amazonaws.com",port,bTls,bAutoReconnect); // Provide AWS credentials for the REST call. authAws = CkAuthAws_Create(); CkAuthAws_putAccessKey(authAws,"AWS_ACCESS_KEY"); CkAuthAws_putSecretKey(authAws,"AWS_SECRET_KEY"); CkAuthAws_putServiceName(authAws,"s3"); // For AWS Signature Version 2, the following two properties need to be set: CkAuthAws_putSignatureVersion(authAws,2); // See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement CkAuthAws_putCanonicalizedResourceV2(authAws,"/chilkat100/starfish.jpg"); success = CkRest_SetAuthAws(rest,authAws); // Send the request to download the JPG. success = CkRest_SendReqNoBody(rest,"GET","/starfish.jpg"); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkAuthAws_Dispose(authAws); return; } // Read the response header. responseStatusCode = CkRest_ReadResponseHeader(rest); if (responseStatusCode < 0) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkAuthAws_Dispose(authAws); return; } printf("Response status code = %d\n",responseStatusCode); // We expect a 200 response status if the JPG data is coming. // Otherwise, we'll get a string response body with an error message(or no response body). if (responseStatusCode == 200) { bodyStream = CkStream_Create(); // The stream's sink will be a file. CkStream_putSinkFile(bodyStream,"qa_output/starfish.jpg"); // Read the response body to the stream. Given that we've // set the stream's sink to a file, it will stream directly // to the file. success = CkRest_ReadRespBodyStream(rest,bodyStream,TRUE); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkRest_Dispose(rest); CkAuthAws_Dispose(authAws); CkStream_Dispose(bodyStream); return; } printf("Successfully received the JPG file.\n"); } else { errResponse = CkRest_readRespBodyString(rest); if (CkRest_getLastMethodSuccess(rest) != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); } else { printf("%s\n",errResponse); } } CkRest_Dispose(rest); CkAuthAws_Dispose(authAws); CkStream_Dispose(bodyStream); } |
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