[Add] #16 소셜 로그인정보 Firebase Auth와 연동

BMDJ/ViewController/LoginViewController.swift

@@ -13,6 +13,7 @@ import RxCocoa
 import SnapKit
 
 import GoogleSignIn
+import FirebaseAuth
 
 final class LoginViewController: UIViewController, View {
 
@@ -208,10 +209,13 @@ final class LoginViewController: UIViewController, View {
         GIDSignIn.sharedInstance.signIn(with: signInConfig, presenting: self) { user, error in
             guard error == nil else { return }
             print("Google User ID: \(user?.userID ?? "nil")")
-            if let idToken = user?.authentication.idToken {
+            if let idToken = user?.authentication.idToken,
+               let accessToken = user?.authentication.accessToken {
                 AuthClient.shared.google(token: idToken)
                     .subscribe(onNext: { token in
                         print("Google: \(token)")
+                        let credential = GoogleAuthProvider.credential(withIDToken: idToken, accessToken: accessToken)
+                        Auth.auth().signIn(with: credential)
                         self.loginSuccess(token: token)
                     })
                     .disposed(by: self.disposeBag)
@@ -271,6 +275,9 @@ extension LoginViewController: ASAuthorizationControllerDelegate {
             AuthClient.shared.apple(userID: token)
                 .subscribe(onNext: { id in
                     print("Apple: \(id)")
+                    let nonce = self.randomNonceString()
+                    let credential = OAuthProvider.credential(withProviderID: "apple.com", idToken: token, rawNonce: nonce)
+                    Auth.auth().signIn(with: credential)
                     self.loginSuccess(token: id)
                 })
                 .disposed(by: disposeBag)
@@ -282,4 +289,36 @@ extension LoginViewController: ASAuthorizationControllerDelegate {
     func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
         print("Apple Login Fail")
     }
+
+    private func randomNonceString(length: Int = 32) -> String {
+      precondition(length > 0)
+      let charset: Array<Character> =
+          Array("0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._")
+      var result = ""
+      var remainingLength = length
+
+      while remainingLength > 0 {
+        let randoms: [UInt8] = (0 ..< 16).map { _ in
+          var random: UInt8 = 0
+          let errorCode = SecRandomCopyBytes(kSecRandomDefault, 1, &random)
+          if errorCode != errSecSuccess {
+            fatalError("Unable to generate nonce. SecRandomCopyBytes failed with OSStatus \(errorCode)")
+          }
+          return random
+        }
+
+        randoms.forEach { random in
+          if remainingLength == 0 {
+            return
+          }
+
+          if random < charset.count {
+            result.append(charset[Int(random)])
+            remainingLength -= 1
+          }
+        }
+      }
+
+      return result
+    }
 }