I want to send a POST request to my php 7 server which accepts data as application/x-www-form-urlencoded
. The data I have is inside a Struct and I want to get every property of this struct as a parameter when I submit it.
This is the struct which handles my urlSession requests both GET and POST
XHR.swift
struct XHR {
enum Result<T> {
case success(T)
case failure(Error)
}
func urlSession<T>(method: String? = nil, file: String, data: Data? = nil, completionHandler: @escaping (Result<T>) -> Void) where T: Codable {
let file = file.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)!
// Set up the URL request
guard let url = URL.init(string: file) else {
print("Error: cannot create URL")
return
}
var urlRequest = URLRequest(url: url)
if method == "POST" {
urlRequest.httpMethod = "POST";
urlRequest.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
urlRequest.httpBody = data
print(urlRequest.httpBody)
}
// set up the session
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
// vs let session = URLSession.shared
// make the request
let task = session.dataTask(with: urlRequest, completionHandler: {
(data, response, error) in
DispatchQueue.main.async { // Correct
guard let responseData = data else {
print("Error: did not receive data")
return
}
let decoder = JSONDecoder()
print(String(data: responseData, encoding: .utf8))
do {
let todo = try decoder.decode(T.self, from: responseData)
completionHandler(.success(todo))
} catch {
print("error trying to convert data to JSON")
//print(error)
completionHandler(.failure(error))
}
}
})
task.resume()
}
}
This is the functions which sends a POST request to the server:
VideoViewModel.swift
struct User: Codable {
let username: String
let password: String
static func archive(w:User) -> Data {
var fw = w
return Data(bytes: &fw, count: MemoryLayout<User>.stride)
}
static func unarchive(d:Data) -> User {
guard d.count == MemoryLayout<User>.stride else {
fatalError("BOOM!")
}
var w:User?
d.withUnsafeBytes({(bytes: UnsafePointer<User>)->Void in
w = UnsafePointer<User>(bytes).pointee
})
return w!
}
}
enum Login {
case success(User)
case failure(Error)
}
func login(username: String, password: String, completionHandler: @escaping (Login) -> Void) {
let thing = User(username: username, password: password)
let dataThing = User.archive(w: thing)
xhr.urlSession(method: "POST", file: "https://kida.al/login_register/", data: dataThing) { (result: XHR.Result<User>) in
switch result {
case .failure(let error):
completionHandler(.failure(error))
case .success(let user):
//let convertedThing = User.unarchive(d: user)
completionHandler(.success(user))
}
}
}
And I call it like this:
videoViewModel.login(username: "rexhin", password: "bonbon") { (result: VideoViewModel.Login) in
switch result {
case .failure(let error):
print("error")
case .success(let user):
print(user)
}
}
From PHP I can see that a POST request is submitted successfully but when I try to get the username
field by doing $_POST["username"]
I get Undefined index:
Full code of the app can be seen here https://gitlab.com/rexhin/ios-kida.git
I used below code in swift 4
guard let url = URL(string: "http://192.168.88.129:81/authenticate") else {
return
}
let user1 = username.text!
let pass = passwordfield.text!
print(user1)
print(pass)
let data : Data = "username=\(user1)&password=\(pass)&grant_type=password".data(using: .utf8)!
var request : URLRequest = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField:"Content-Type");
request.setValue(NSLocalizedString("lang", comment: ""), forHTTPHeaderField:"Accept-Language");
request.httpBody = data
print("one called")
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
// vs let session = URLSession.shared
// make the request
let task = session.dataTask(with: request, completionHandler: {
(data, response, error) in
if let error = error
{
print(error)
}
else if let response = response {
print("her in resposne")
}else if let data = data
{
print("here in data")
print(data)
}
DispatchQueue.main.async { // Correct
guard let responseData = data else {
print("Error: did not receive data")
return
}
let decoder = JSONDecoder()
print(String(data: responseData, encoding: .utf8))
do {
// let todo = try decoder.decode(T.self, from: responseData)
// NSAssertionHandler(.success(todo))
} catch {
print("error trying to convert data to JSON")
//print(error)
// NSAssertionHandler(.failure(error))
}
}
})
task.resume()
}
You are passing the result of User.archive(w: thing)
as the data
embedded in the request body, which may never work. Generally, your archive(w:)
and unarchive(d:)
would never generate any useful results and you should better remove them immediately.
If you want to pass parameters where x-www-form-urlencoded
is needed, you need to create a URL-query-like string.
Try something like this:
func login(username: String, password: String, completionHandler: @escaping (Login) -> Void) {
let dataThing = "username=\(username)&password=\(password)".data(using: .utf8)
xhr.urlSession(method: "POST", file: "https://kida.al/login_register/", data: dataThing) { (result: XHR.Result<User>) in
//...
}
}
The example above is a little bit too simplified, that you may need to escape username
and/or password
before embedding it in a string, when they can contain some special characters. You can find many articles on the web about it.
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