How to know if a string is already escaped special with special characters?

Question

I have this URL:

"http://www.somedomain.com/folder/مرحبا المستخدم.jpg"

So I needs to escape these Arabic values else it will not able to create URL object.

I am doing it like this,

let originalString = "http://www.somedomain.com/folder/مرحبا المستخدم.jpg"
let escapedString = originalString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)

This will be the output of escapedString:

http://www.somedomain.com/folder/%D9%85%D8%B1%D8%AD%D8%A8%D8%A7%20%D8%A7%D9%84%D9%85%D8%B3%D8%AA%D8%AE%D8%AF%D9%85.jpg

So far so good. But when I force to try to escape an already escaped URL then the result is weird.

How to check if a string is already encoded?

Answer 1

you can do it smoothly:

extension String {
    func isEscaped() -> Bool {
        return self.removingPercentEncoding != self
    }
}

then

let yourEscapedString = "http://www.somedomain.com/folder/%D9%85%D8%B1%D8%AD%D8%A8%D8%A7%20%D8%A7%D9%84%D9%85%D8%B3%D8%AA%D8%AE%D8%AF%D9%85.jpg"
print(yourEscapedString.isEscaped()) // true

let yourNotEscapedString = "http://www.somedomain.com/folder/مرحبا المستخدم.jpg"
print(yourNotEscapedString.isEscaped()) // false