How to upload the image to amazon bucket in swift3? - ios

Question

I want to post the customer signature image to amazon s3 bucket_type server with an api...I am referring with different tutorials...I didn't get enough information from any of tutorials...I am trying with following code but I am getting nil result...
funcUpload(service:String,imagedata:Data,completion:#escaping (_ result:NSDictionary?,_ error:AnyObject?) -> ()){
let boundaryConstant = "----------V2y2HFg03eptjbaKO0j1"
let urlpath:String = "http:myurl" + service
let url:NSURL = NSURL(string:urlpath)!
let request = NSMutableURLRequest(url: url as URL)
request.httpMethod = "P0ST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData
request.httpShouldHandleCookies = false
let contentType = "multipart/form-data; boundary=\(boundaryConstant)"
request.setValue(contentType, forHTTPHeaderField: "Content-Type"
let body = NSMutableData()
if imagedata != nil{
body.append("--\(boundaryConstant)\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Disposition: form-data; name=\"\("universalapparealproduct")\" ; filename=\"image.jpg\"\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Type: \("universalapparealproduct")\r\n\r\n".data(using: String.Encoding.utf8)!)
body.append(imagedata)
body.append("\r\n".data(using: String.Encoding.utf8)!)
}
body.append("--\(boundaryConstant)--\r\n".data(using: String.Encoding.utf8)!)
request.httpBody = body as Data
let config = URLSessionConfiguration.ephemeral
self.session = URLSession(configuration: config)
let task = session.dataTask(with: request as URLRequest) { (data, response, error) -> Void in
if let receivedData = data
{
do
{let resultDic = try JSONSerialization.jsonObject(with: receivedData, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
completion(resultDic!,nil)
}
catch let error
{
NSLog("\(error)")
}
}
else if let errorMessage = error
{
completion(nil,errorMessage as AnyObject?)
}
self.session.invalidateAndCancel()
}
task.resume()
}
}
Please can any one help me to resolve this issue.
Thanks in advance.

Answer 1

let urlpath:String = "http:myurl" + service looks like a typo.
I assume that the service variable contain a url with pre-signed credentials that you can upload to. Make sure that is correct. If not you have to have a server serve you pre-signed credentials.
use PUT not POST
I would expect that the body of the request would just be the imageData, but you seem to be adding a lot of stuff to body. I don't know what kind of file you want to upload but you are making a weird file. If that is your intent is fine, but just we aware that is what you are doing. If indenting to upload a custom file type, I would move all of that code to a different function and then have another function that just uploads the data.
the only HTTPHeader field that you have to set is Content-Length. It must be set to the size of the body that you send.
The expected result of the request is data with a length of 0 and no error. So your JSONSerialization in the response block in wrong.

Answer 2

func imageUpload(service:String,token:String,imagedata:Data,completion:#escaping (_ result:NSDictionary?,_ error:AnyObject?) -> ())
{
let boundaryConstant = "----------V2y2HFg03eptjbaKO0j1"
let params = NSMutableDictionary()
let bucket_name = "userspecifiedbucketname"
params.setObject("(bucket_name)", forKey:"bucket_type" as NSCopying)
let urlpath:String = "http://\(myurladdress)/" + service
let url:NSURL = NSURL(string:urlpath)!
print("URL:\(url)")
var request = URLRequest(url: url as URL)
request.httpMethod = "POST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData
let contentType = "multipart/form-data; boundary=\(boundaryConstant)"
request.setValue(contentType, forHTTPHeaderField: "Content-Type")
if token != ""
{
request.setValue("\(token)", forHTTPHeaderField: "Authorization")
}
let body = NSMutableData()
for param in params {
body.append("--\(boundaryConstant)\r\n" .data(using: String.Encoding.utf8,allowLossyConversion: false)! )
body.append("Content-Disposition: form-data; name=\"\(param.key)\"\r\n\r\n" .data(using: String.Encoding.utf8,allowLossyConversion: false)!)
body.append("\(param.value)\r\n" .data(using: String.Encoding.utf8,allowLossyConversion: false)!)
}
body.append("--\(boundaryConstant)\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
body.append("Content-Disposition: form-data; name=\"\("file")\" ; filename=\"image.jpg\"\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
body.append("Content-Type: image/jpeg\r\n\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
body.append(imagedata)
body.append("\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
// image end
body.append("--\(boundaryConstant)--\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
request.httpBody = body as Data
let postLength = "\(body.length)"
request.setValue(postLength, forHTTPHeaderField: "Content-Length")
}
NOTE: (Here bucket_name should be same as server side bucket_name )