feat: parse token util function

Sources/mpc-core-kit-swift/Helper.swift

@@ -11,7 +11,6 @@ import tkey
 import BigInt
 import curveSecp256k1
 import FetchNodeDetails
-
 import SingleFactorAuth
 
 
@@ -79,3 +78,32 @@ public extension Web3AuthNetwork {
         return convertWeb3AuthNetworkToTorusNetWork(network: self)
     }
 }
+
+public func parseToken(jwtToken jwt: String) -> [String: Any] {
+  let segments = jwt.components(separatedBy: ".")
+  return decodeJWTPart(segments[1]) ?? [:]
+}
+
+func base64UrlDecode(_ value: String) -> Data? {
+  var base64 = value
+    .replacingOccurrences(of: "-", with: "+")
+    .replacingOccurrences(of: "_", with: "/")
+
+  let length = Double(base64.lengthOfBytes(using: String.Encoding.utf8))
+  let requiredLength = 4 * ceil(length / 4.0)
+  let paddingLength = requiredLength - length
+  if paddingLength > 0 {
+    let padding = "".padding(toLength: Int(paddingLength), withPad: "=", startingAt: 0)
+    base64 = base64 + padding
+  }
+  return Data(base64Encoded: base64, options: .ignoreUnknownCharacters)
+}
+
+func decodeJWTPart(_ value: String) -> [String: Any]? {
+  guard let bodyData = base64UrlDecode(value),
+    let json = try? JSONSerialization.jsonObject(with: bodyData, options: []), let payload = json as? [String: Any] else {
+      return nil
+  }
+
+  return payload
+}

Tests/mpc-kit-swiftTests/mpc_kit_swiftTests.swift

@@ -3,6 +3,7 @@ import XCTest
 import JWTKit
 import curveSecp256k1
 import SingleFactorAuth
+import Foundation
 
 // JWT payload structure.
 struct TestPayload: JWTPayload, Equatable {
@@ -83,6 +84,7 @@ func mockLogin2 (email:String) throws -> String {
 
             let payload = TestPayload(subject: SubjectClaim(stringLiteral: subject), expiration: ExpirationClaim(value: modifiedDate), audience: "torus-key-test", isAdmin: false, emailVerified: true, issuer: "torus-key-test", iat: IssuedAtClaim(value: Date()), email: email)
             let jwt = try signers.sign(payload)
+
             return jwt
         } catch {
             throw error
@@ -187,4 +189,18 @@ final class mpc_kit_swiftTests: XCTestCase {
         let hash2 =  try Data(hex: "010203040506").sha3(varient: Variants.KECCAK256)
         let signatures2 = try await coreKitInstance2.tssSign(message: hash2)
     }
+
+    func testparseToken() async throws {
+       let email = "testiosEmail004"
+        let data = try  mockLogin2(email: email)
+       let token = data
+        let parsedToken = parseToken(jwtToken: token);
+        print("Parsed Token: \(parsedToken)");
+        if let parsedEmail = parsedToken["email"] as? String {
+            XCTAssertEqual(parsedEmail, email);
+            print(parsedEmail);
+        } else {
+            XCTFail("Verifier ID not matching.")
+        }
+    }
 }