PercentEncodedURLPropertyWrapper.swift

import Foundation

@propertyWrapper
public struct PercentEncodedURL: Codable {
    
    public let wrappedValue: URL
    
    public init(wrappedValue: URL) {
        self.wrappedValue = wrappedValue
    }
    
    public init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        do {
            self.wrappedValue = try container.decode(URL.self)
        } catch(let error) {
            guard
                let urlString = try? container.decode(String.self),
                let encodedURLString = urlString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed),
                let encodedURL = URL(string: encodedURLString) else {
                    throw error
            }
            self.wrappedValue = encodedURL
        }
    }
    public func encode(to encoder: Encoder) throws {
        try wrappedValue.encode(to: encoder)
    }
}