Upload image using Amazon PreSigned URL gives status code 400 everytime iOS - ios

Question

Point :
I am working on uploading image using Amazon Pre-Signed URL in my iOS App
Now the issue is i am getting status code 400 everytime when i upload it
It should give 204 status code if it works well
Pre-Signed URL works well while testing on Postman but not working on App side.
Here is the implementation :
- (void)doUploadURL {
UIImage *myimage = [UIImage imageNamed:#"testimage.png"];
NSData *imageData = UIImagePNGRepresentation(myimage);
NSString *boundary = #"---011000010111000001101001";
NSMutableData *body = [NSMutableData data];
// AcL parameter
[body appendData:[[NSString stringWithFormat:#"--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"acl\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strAcL dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// Content-Type parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"Content-Type\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strContentType dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// key parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"key\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strKey dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// x-amz-meta-filename parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"x-amz-meta-filename\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strMetaFilename dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// X-Amz-Credential parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"X-Amz-Credential\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strCredential dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// X-Amz-Algorithm parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"X-Amz-Algorithm\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strAlgorithm dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// X-Amz-Date parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"X-Amz-Date\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strAmzDate dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// Policy parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"Policy\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strPolicy dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// X-Amz-Signature parameter
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"X-Amz-Signature\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[strSignature dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// file
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[#"Content-Disposition: attachment; name=\"file\"; filename=\"testimage.png\"\\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[#"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
NSDictionary *headers = #{ #"content-type": #"multipart/form-data"};
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://visual-showcase.s3-ap-southeast-2.amazonaws.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:3600.0];
[request setHTTPMethod:#"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:body];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
NSLog(#" Final Response : %d",httpResponse.statusCode);
if (error) {
NSLog(#"Error :  %#", error);
dispatch_async(dispatch_get_main_queue(), ^{
[[[UIAlertView alloc] initWithTitle:#"Alert" message:#"Failed to upload" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil] show];
return;
});
} else {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
NSError *err = nil;
NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&err];
}
}];
[dataTask resume];
}
Response code :
<NSHTTPURLResponse: 0x7d10e2c0> { status code: 400, headers {
Connection = close;
"Content-Type" = "application/xml";
Date = "Thu, 02 Feb 2017 07:20:18 GMT";
Server = AmazonS3;
"Transfer-Encoding" = Identity;
"x-amz-id-2" = "HIFhwBaj/ejjGoCgD2vacG2AtoxEFDXxSr6eulZtzUbuLoTcLT+AA9k6093Jyv5OIuK2wpi7+9c=";
"x-amz-request-id" = C221CD8DA2D80BCD;
} }
Question :
My question is, is there anything we need to set while uploading files using Amazon Pre-Signed URL ? Or we can just implement it like normal API calls ?
As per my knowledge & it should be implemented similar way like normal APIs
Please do let me get any hint or if something wrong i am doing in request format
Thanks in Advance.

Answer 1

Finally resolved the issue by changing the request parameters format. Below is the working code.
- (void)doUploadURL {
UIImage *myimage = [UIImage imageNamed:#"testimage.png"];
NSData *imageData = UIImagePNGRepresentation(myimage);
NSString *boundary = #"------VohpleBoundary4QuqLuM1cE5lMwCy";
NSMutableData *body = [NSMutableData data];
//Populate a dictionary with all the regular values you would like to send.
NSMutableDictionary *parameters = [[NSMutableDictionary alloc] init];
[parameters setValue:strAcL forKey:#"acl"];
[parameters setValue:strContentType forKey:#"Content-Type"];
[parameters setValue:strKey forKey:#"key"];
[parameters setValue:strMetaFilename forKey:#"x-amz-meta-filename"];
[parameters setValue:strCredential forKey:#"X-Amz-Credential"];
[parameters setValue:strAlgorithm forKey:#"X-Amz-Algorithm"];
[parameters setValue:strAmzDate forKey:#"X-Amz-Date"];
[parameters setValue:strPolicy forKey:#"Policy"];
[parameters setValue:strSignature forKey:#"X-Amz-Signature"];
// add params (all params are strings)
for (NSString *param in parameters) {
[body appendData:[[NSString stringWithFormat:#"--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"%#\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"%#\r\n", [parameters objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];
}
// Upload image
[body appendData:[[NSString stringWithFormat:#"--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"file\"; filename=\"testimage.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[#"Content-Type:image/png\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:#"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
//Close off the request with the boundary
[body appendData:[[NSString stringWithFormat:#"--%#--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"APIURL"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:3600.0];
[request setHTTPMethod:#"POST"];
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:#"multipart/form-data; boundary=%#", boundary];
[request setValue:contentType forHTTPHeaderField: #"Content-Type"];
[request setHTTPBody:body];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
if (error) {
NSLog(#"Error :  %#", error);
dispatch_async(dispatch_get_main_queue(), ^{
[[[UIAlertView alloc] initWithTitle:#"Alert" message:#"Failed to upload" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil] show];
return;
});
} else {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
NSError *err = nil;
NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&err];
}
}];
[dataTask resume];
}
Hope it will help guiding someone.