Change WalletError from String to Int (trustwallet#18)

Sources/Shared/Error.swift

@@ -6,10 +6,36 @@
 
 import Foundation
 
-public enum WalletError: String, LocalizedError {
+public enum WalletError: Int {
+    /// Unknown Error
+    case unknown = -1
+
+    /// No Error occurred
+    case none = 0
+
     /// Error generated when the user cancells the sign request.
-    case cancelled
+    case cancelled = 1
 
     /// Error generated when the request is invalid.
-    case invalidRequest
+    case invalidRequest = 2
+
+    /// Error generated when current wallet is watch only
+    case watchOnly = 3
+}
+
+extension WalletError: LocalizedError {
+    public var errorDescription: String? {
+        switch self {
+        case .unknown:
+            return "Unknown Error"
+        case .none:
+            return "No Error"
+        case .cancelled:
+            return "User cancelled"
+        case .invalidRequest:
+            return "Signing request is invalid"
+        case .watchOnly:
+            return "Wallet is watch only"
+        }
+    }
 }

Sources/TrustSDK/Commands/SignMessageCommand.swift

@@ -54,7 +54,9 @@ public class SignMessageCommand: Command {
         guard let components = URLComponents(url: url, resolvingAgainstBaseURL: false), components.host == name else {
             return false
         }
-        if let errorString = components.queryItems?.first(where: { $0.name == "error" })?.value, let error = WalletError(rawValue: errorString) {
+        if let value = components.queryItems?.first(where: { $0.name == "error" })?.value,
+            let errorCode = Int(value),
+            let error = WalletError(rawValue: errorCode) {
             completion(.failure(error))
             return true
         }

Sources/TrustSDK/Commands/SignTransactionCommand.swift

@@ -56,7 +56,9 @@ public final class SignTransactionCommand: Command {
             return false
         }
 
-        if let errorString = components.queryItems?.first(where: { $0.name == "error" })?.value, let error = WalletError(rawValue: errorString) {
+        if let value = components.queryItems?.first(where: { $0.name == "error" })?.value,
+            let errorCode = Int(value),
+            let error = WalletError(rawValue: errorCode) {
             completion(.failure(error))
             return true
         }

Sources/TrustWalletSDK/TrustWalletSDK.swift

@@ -120,7 +120,7 @@ public final class TrustWalletSDK {
 
     private func callbackWithFailure(url: URL, error: WalletError) {
         var components = URLComponents(url: url, resolvingAgainstBaseURL: false)!
-        components.append(queryItem: URLQueryItem(name: "error", value: error.rawValue))
+        components.append(queryItem: URLQueryItem(name: "error", value: "\(error.rawValue)"))
         UIApplication.shared.open(components.url!, options: [:], completionHandler: nil)
     }
 }