Improves user error message

LeStorage/Services.swift

@@ -110,19 +110,21 @@ public class Services {
                   {"detail":"Informations d'authentification non fournies."}
                  */
                 Logger.log("Failed Run \(request.httpMethod ?? "") \(request.url?.absoluteString ?? "")")
-                var errorString: String = String(data: task.0, encoding: .utf8) ?? ""
+                let errorString: String = String(data: task.0, encoding: .utf8) ?? ""
+                var errorMessage = ErrorMessage(error: errorString, domain: "")
+                
                 if let message = self.errorMessageFromResponse(data: task.0) {
-                    errorString = message
+                    errorMessage = message
                 }
 
                 if let apiCallId, let type = (T.self as? any Storable.Type) {
                     try Store.main.rescheduleApiCalls(id: apiCallId, type: type)
-                    Store.main.logFailedAPICall(apiCallId, request: request, collectionName: type.resourceName(), error: errorString)
+                    Store.main.logFailedAPICall(apiCallId, request: request, collectionName: type.resourceName(), error: errorMessage.message)
                 } else {
-                    Store.main.logFailedAPICall(request: request, error: errorString)
+                    Store.main.logFailedAPICall(request: request, error: errorMessage.message)
                 }
                 
-                throw ServiceError.responseError(response: errorString)
+                throw ServiceError.responseError(response: errorMessage.error)
             }
         }
         return try jsonDecoder.decode(T.self, from: task.0)
@@ -358,7 +360,7 @@ public class Services {
     /// Parse a json data and tries to extract its error message
     /// - Parameters:
     ///  - data: some JSON data
-    fileprivate func errorMessageFromResponse(data: Data) -> String? {
+    fileprivate func errorMessageFromResponse(data: Data) -> ErrorMessage? {
         do {
             if let jsonObject = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] {
                 if let tuple = jsonObject.first {
@@ -368,7 +370,7 @@ public class Services {
                     } else if let string = tuple.value as? String {
                         error = string
                     }
-                    return "\(error) (\(tuple.key))"
+                    return ErrorMessage(error: error, domain: tuple.key)
                 }
             }
         } catch {
@@ -379,6 +381,15 @@ public class Services {
     
 }
 
+struct ErrorMessage {
+    let error: String
+    let domain: String
+    
+    var message: String {
+        return "\(self.error) (\(self.domain))"
+    }
+}
+
 struct AuthResponse: Codable {
     let token: String
 }