ContentView.swift

//
//  ContentView.swift
//  Hoge
//
//  Created by Tetsuya Shiraishi on 2020/09/18.
//  Copyright © 2020 MUSHIKAGO DESIGN STUDIO CO., LTD. All rights reserved.
//

import SwiftUI
import LineSDK
import Firebase
import GTMSessionFetcher

struct ContentView: View {
    
    @State var errorMsg = "---"
    
    var body: some View {
        
        
        
        VStack {
            Text(self.errorMsg).padding()
            HStack {
                Text("hoge")
                Text("fuga")
            }
            Button(action: {LoginManager.shared.login(permissions: [.profile], in: self.body as? UIViewController) {
                    result in
                    switch result {
                    case .success(let loginResult):
                        
                        let customToken = loginResult.accessToken.value
                        
                        requestFirebaseAuthTokenWithLINEAccessToken(lineAccessToken: customToken)
                        
                        // Do other things you need with the login result
                    case .failure(let error):
                        self.errorMsg = error.errorDescription ?? "some error"
                    }
                }}) {
                Text("Line Login")
                    .padding(.all, 20.0)
            }
        }
    }
}


private func requestFirebaseAuthTokenWithLINEAccessToken(lineAccessToken:String){
    
    let LineSDKConfig = Bundle.main.infoDictionary!["LineSDKConfig"] as! Dictionary<String,AnyObject>
    let _validationServerDomain = LineSDKConfig["ValidationServerDomain"] as! String
    
    var _firebaseTokenFetcher:GTMSessionFetcher?
    if let fFetcher = _firebaseTokenFetcher{
        if fFetcher.isFetching {
            fFetcher.stopFetching()
        }
    }
    
    let urlString = _validationServerDomain + "/verifyToken"
    let url = URL(string: urlString)
    var request = URLRequest(url: url!) //NSMutableURLRequest(url: url!)
    request.httpMethod = "POST"
    request.setValue("application/json", forHTTPHeaderField: "content-type")
    let params: [String: String] = [
        "token": lineAccessToken
    ]
    do {
        let requestBody = try JSONSerialization.data(withJSONObject: params, options: [])
        let jsonStr = String(bytes: requestBody, encoding: .utf8)!
        print(jsonStr)
        
        request.httpBody = requestBody
        
        _firebaseTokenFetcher = GTMSessionFetcher.init(request: request)
        _firebaseTokenFetcher?.beginFetch(completionHandler: { (data:Data?, error:Error?) in
            
            if let _data = data{
                
                if let jsonStr = String(data: _data, encoding: String.Encoding.utf8){
                    if let _data = jsonStr.data(using: .utf8){
                        do {
                            let dic = try JSONSerialization.jsonObject(with: _data, options: []) as! [String: String]
                            
                            let firebaseToken = dic["firebase_token"]
                            authenticateWithFirebaseToken(firebaseToken: firebaseToken!)
                            
                        } catch {
                            print(error.localizedDescription)
                        }
                    }
                }
                
                
                
            }else{
                print("data is empty....")
            }
            
        })
        
        
    } catch (let e) {
        print(e)
    }
    
    
}

private func authenticateWithFirebaseToken(firebaseToken:String){
    Auth.auth().signIn(withCustomToken: firebaseToken) { (result:AuthDataResult?, error:Error?) in
        print(result?.user.uid)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}