I am developing an application in Swift language. I set up a backend service with amazon s3 service and fast api. I want to save an image with .png extension to this backend service. I am getting 422 "422 Unprocessable Entity" error from the server while sending the photo. I know this error occurs because the format is wrong but I couldn't fix the problem. I am sharing the part of the code I wrote in swift and the fast-api screenshot.
format
inputs
`func uploadImage2(paramName: String, fileName: String, image: UIImage, uid: String) {
let urlString = ""
let url = NSURL(string: urlString)!
let requestURL = NSMutableURLRequest(url: url as URL)
requestURL.httpMethod = "POST"
requestURL.addValue("multipart/form-data", forHTTPHeaderField: "Content-Type")
let body = NSMutableData()
body.append("file=#\(image)".data(using: String.Encoding.utf8)!)
body.append("type=image/png".data(using: String.Encoding.utf8)!)
requestURL.httpBody = body as Data
let task = URLSession.shared.dataTask(with: requestURL as URLRequest){ data,response,error in
if let data = data {
let sendedData = String(data: data, encoding: .utf8)
print("Succesful + \(String(describing: sendedData))")
} else {
print("Error: \(String(describing: error))")
}
}
task.resume()
}`
I'm having trouble uploading photos to the server.
Related
Im trying to send an image to the server and it keeps throwing me a 400 error. My guess is its in the body. However the postman requests gets success.
Postman Request
My Code as bellow
/*****Multipart Upload*********/
func uploadImage(paramName: String, fileType: String, image: UIImage,id:String,comepletion:#escaping ()->Void,failure:#escaping (String)->Void) {
let url = URL(string: "https:someURL")
let boundary = UUID().uuidString
let session = URLSession.shared
var urlRequest = URLRequest(url: url!)
urlRequest.httpMethod = "POST"
urlRequest.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
urlRequest.setValue(id, forHTTPHeaderField: "some_id")
// Add the image data to the raw http request data
data.append("\r\n--\(boundary)\r\n".data(using: .utf8)!)
//I guess the issue is in the bellow line since I'm
// supposed to send a param called "files" as per the postman screenshot
data.append("Content-Disposition: form-data; name=\"\(paramName)\"; filename=\"\(fileType)\"\r\n".data(using: .utf8)!)//Issue is here
data.append("Content-Type: image/png\r\n\r\n".data(using: .utf8)!)
data.append(image.pngData()!)
data.append("\r\n--\(boundary)--\r\n".data(using: .utf8)!)
// Send a POST request to the URL, with the data we created earlier
session.uploadTask(with: urlRequest, from: data, completionHandler: { responseData, response, error in
if error == nil {
let jsonData = try? JSONSerialization.jsonObject(with: responseData!, options: .allowFragments)
if let json = jsonData as? [String: Any] {
print(json)
}
// comepletion()
}else {
failure(error?.localizedDescription ?? "")
}
}).resume()
}
Seem you lost set Content Length for urlRequest
try add:
urlRequest.setValue(String(data.count), forHTTPHeaderField: "Content-Length")
I'm building an iOS application and I need to access the information on a website. I've located the API endpoint, and was able to get a result in Postman
screenshot of API header and form data
So far I have this code which can allow me to make the request, but how do I parse the response(which is an HTML form, then display response in app
var urlRequest = URLRequest(url: url!)
urlRequest.setValue("application/form-data",forHTTPHeaderField: "Content-Type")
urlRequest.httpMethod = "POST"
let postString = "year=2021&season=Outdoor&province=ON&age_group=OPEN&age_sub_group_masters=ALL&age_sub_group_para=ALL&rankings_event=100m&best_by_athlete=1&rankings_event_spec_num=1&is_relay_EVENT=0&page=1"
urlRequest.httpBody = postString.data(using: .utf8)
urlRequest = .init(url: url!)```
I actually found a great resources that showed how to send POST Request with post body, and how to read the response
How To send POST Request
Now it's just a matter of parsing the HTML that is returned, and displaying it in app.
let url = URL(string: Constants.rankingAPI)
guard let requestUrl = url else {
fatalError()
}
var request = URLRequest(url: requestUrl)
request.httpMethod = "POST"
let postString = "year=2021&season=Outdoor&province=ON&age_group=OPEN&age_sub_group_masters=ALL&age_sub_group_para=ALL&rankings_event=100m&best_by_athlete=1&rankings_event_spec_num=1&is_relay_EVENT=0&page=1"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
// Check for Error
if let error = error {
print("Error took place \(error)")
return
}
// Convert HTTP Response Data to a String
if let data = data, let dataString = String(data: data, encoding: .utf8) {
print("Response data string:\n \(dataString.htmlToString)")
}
}
task.resume()
}
I have an app allow user upload a photo from photo library, first the app convert the image to base64 string and then pass the string to server through web service (C#.net).
Finally it is only work on some simple photos (e.g. black & white photos, small photos) but failed if color photos, I am not sure but i guess the base64 string truncated when passing to web server. (May be the string too long). Is it any problem on my code below?
func UploadPhoto(img: UIImage){
let strBase64 = img.jpegData(compressionQuality: 1)?.base64EncodedString() ?? ""
var request = URLRequest(url: URL(string: "https://xxxxx/uploadimg.asmx/UploadFile")!)
request.httpMethod = "POST"
let postString = "Base64String=" + strBase64
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request)
{
data, response, error in
if error == nil && data!.count > 0, let _ = data {
do
{
print ("API UploadFile Finished")
}
catch let error as NSError
{
print("UploadFile error")
print(error)
}
}
}
task.resume()
}
I am building an app using Swift 3.0 for study purpose.
One of the functions is to fetch and save data from(to) SQL Server database tables. One of the columns is to store IMAGE(photo) in table: data type in table is Image (system.Byte[]) in SQL Server.
I can get the photo column through web api and show it in Image component like this:
let encodedImageData = My web api url
let imageData = NSData(base64EncodedString: encodedImageData options: .allZeros)
let image = UIImage(data: imageData)
let imageView.image = image
I had problem to save the Image to the database through web api (can save other columns, but had problem with Image column).
I tried this:
let data = UIImagePNGRepresentation(image) as NSData?
but failed.
my web api and invoke as below:
func post(parameters : Dictionary<String, String>, urlString : String) {
var request = URLRequest(url: URL(string: urlString)!)
let session = URLSession.shared
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.httpBody = try! JSONSerialization.data(withJSONObject: parameters)
let task = session.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print("error: \(error)")
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any] {
let success = json["success"] as? Int // Okay, the `json` is here, let's get the value for 'success' out of it
print("Success: \(success)")
} else {
let jsonStr = String(data: data, encoding: .utf8) // No error thrown, but not dictionary
print("Error could not parse JSON: \(jsonStr)")
}
} catch let parseError {
print(parseError) // Log the error thrown by `JSONObjectWithData`
let jsonStr = String(data: data, encoding: .utf8)
print("Error could not parse JSON: '\(jsonStr)'")
}
}
task.resume()
}
#IBAction func insert(){
let imageData = UIImagePNGRepresentation(myimageview.image!) as NSData?
post(parameters: ["Name": nametxt.text!,"Address": addresstxt.text!,"photoname": photonametxt.text!,"photo": String(describing: imageData),"url": urltxt.text! ], urlString: "http://XXXXXXX/api/myfavorites")
}
Can someone help me have a look at image save method to database table in Swift?
I think you are using the wrong data structure for your image. Instead of using NSData and String(describing:) (which definitely does not do what you want), you should directly use a base64 encoded string, like the following code:
#IBAction func insert(){
let imageBase64String = UIImagePNGRepresentation(myimageview.image!)?.base64EncodedString()
post(parameters: ["Name": nametxt.text!,"Address": addresstxt.text!,"photoname": photonametxt.text!,"photo": imageBase64String,"url": urltxt.text! ], urlString: "http://XXXXXXX/api/myfavorites")
}
Problem
I would like to use the MailGun service to send emails from a pure Swift app.
Research So Far
As I understand it, there are two methods to send an email via MailGun. One is to email MailGun with the emails, and MailGun will redirect it (See Send via SMTP). That will, as I understand it, not work, as iOS cannot programatically automatically send mail, and must use methods that require user intervention. As such, I should use the API directly. As I understand it, I need to open a URL to do this, and so I should use some form of NSURLSession, as per this SO answer
Code
MailGun provides documentation for Python, which is as follows:
def send_simple_message():
return requests.post(
"https://api.mailgun.net/v3/sandbox(Personal info).mailgun.org/messages",
auth=("api", "key-(Personal info)"),
data={"from": "Excited User <(Personal info)>",
"to": ["bar#example.com", "(Personal info)"],
"subject": "Hello",
"text": "Testing some Mailgun awesomness!"})
with (Personal info) being substituted for keys/information/emails.
Question
How do I do that in Swift?
Thanks!
In python, the auth is being passed in the header.
You have to do a http post request, passing both the header and the body.
This is a working code:
func test() {
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: NSURL(string: "https://api.mailgun.net/v3/sandbox(Personal info).mailgun.org/messages")!)
request.HTTPMethod = "POST"
let data = "from: Excited User <(Personal info)>&to: [bar#example.com,(Personal info)]&subject:Hello&text:Testinggsome Mailgun awesomness!"
request.HTTPBody = data.dataUsingEncoding(NSASCIIStringEncoding)
request.setValue("key-(Personal info)", forHTTPHeaderField: "api")
let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
if let error = error {
print(error)
}
if let response = response {
print("url = \(response.URL!)")
print("response = \(response)")
let httpResponse = response as! NSHTTPURLResponse
print("response code = \(httpResponse.statusCode)")
}
})
task.resume()
}
people are getting 400 or 401 errors because none of the other answers construct the url correctly. here is some code that works in swift 5 and iOS15:
func sendEmail() {
// variablize our https path with API key, recipient and message text
let mailgunAPIPath = "https://api:YOUR_API_KEY#api.mailgun.net/v3/YOUR_DOMAIN/messages?"
let emailRecipient = "RECIPIENT#EMAIL.COM"
let emailMessage = "Testing%20email%20sender%20variables"
// Create a session and fill it with our request
let session = URLSession.shared
let request = NSMutableURLRequest(url: NSURL(string: mailgunAPIPath + "from=USER#YOUR_DOMAIN&to=\(emailRecipient)&subject=A%20New%20Test%21&text=\(emailMessage)")! as URL)
// POST and report back with any errors and response codes
request.httpMethod = "POST"
let task = session.dataTask(with: request as URLRequest, completionHandler: {(data, response, error) in
if let error = error {
print(error)
}
if let response = response {
print("url = \(response.url!)")
print("response = \(response)")
let httpResponse = response as! HTTPURLResponse
print("response code = \(httpResponse.statusCode)")
}
})
task.resume()
}
requests.post sends an HTTP POST request, encoding key/value pairs as application/x-www-form-urlencoded. You need to do the same.
convert the set of key-value pairs into application/x-www-form-urlencoded as per How to escape the HTTP params in Swift
compose the request using the resulting string for data & send it as per iOS : http Post using swift
I spent hours trying to get the selected answer working, but to no avail.
Although I was finally able to get this working properly with a large HTTP response. I put the full path into Keys.plist so that I can upload my code to github and broke out some of the arguments into variables so I can have them programmatically set later down the road.
// Email the FBO with desired information
// Parse our Keys.plist so we can use our path
var keys: NSDictionary?
if let path = NSBundle.mainBundle().pathForResource("Keys", ofType: "plist") {
keys = NSDictionary(contentsOfFile: path)
}
if let dict = keys {
// variablize our https path with API key, recipient and message text
let mailgunAPIPath = dict["mailgunAPIPath"] as? String
let emailRecipient = "bar#foo.com"
let emailMessage = "Testing%20email%20sender%20variables"
// Create a session and fill it with our request
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: NSURL(string: mailgunAPIPath! + "from=FBOGo%20Reservation%20%3Cscheduler#<my domain>.com%3E&to=reservations#<my domain>.com&to=\(emailRecipient)&subject=A%20New%20Reservation%21&text=\(emailMessage)")!)
// POST and report back with any errors and response codes
request.HTTPMethod = "POST"
let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
if let error = error {
print(error)
}
if let response = response {
print("url = \(response.URL!)")
print("response = \(response)")
let httpResponse = response as! NSHTTPURLResponse
print("response code = \(httpResponse.statusCode)")
}
})
task.resume()
}
The Mailgun Path is in Keys.plist as a string called mailgunAPIPath with the value:
https://API:key-<my key>#api.mailgun.net/v3/<my domain>.com/messages?
Hope this offers a solution to anyone else having issues with MailGun and wanting to avoid a 3rd party solution!
Swift 3 answer:
func test() {
let session = URLSession.shared
var request = URLRequest(url: URL(string: "https://api.mailgun.net/v3/sandbox(Personal info).mailgun.org/messages")!)
request.httpMethod = "POST"
let data = "from: Excited User <(Personal info)>&to: [bar#example.com,(Personal info)]&subject:Hello&text:Testinggsome Mailgun awesomness!"
request.httpBody = data.data(using: .ascii)
request.setValue("key-(Personal info)", forHTTPHeaderField: "api")
let task = session.dataTask(with: request, completionHandler: {(data, response, error) in
if let error = error {
print(error)
}
if let response = response {
print("url = \(response.url!)")
print("response = \(response)")
let httpResponse = response as! HTTPURLResponse
print("response code = \(httpResponse.statusCode)")
}
})
task.resume()
}