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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
import Common
import Foundation
public typealias GUID = String
/// Utilities for futzing with bytes and such.
extension Bytes {
public class func generateGUID() -> GUID {
// Turns the standard NSData encoding into the URL-safe variant that Sync expects.
return generateRandomBytes(9)
.base64EncodedString(options: [])
.replacingOccurrences(of: "/", with: "_")
.replacingOccurrences(of: "+", with: "-")
}
public class func decodeBase64(_ b64: String) -> Data? {
return Data(base64Encoded: b64, options: [])
}
public static func base64urlSafeDecodedData(_ b64: String) -> Data? {
// Replace the URL-safe chars with their URL-unsafe variants
var base64 = b64
.replacingOccurrences(of: "-", with: "+")
.replacingOccurrences(of: "_", with: "/")
// Add padding if needed
if base64.count % 4 != 0 {
base64.append(String(repeating: "=", count: 4 - base64.count % 4))
}
if let data = Data(base64Encoded: base64) {
return data
}
return nil
}
/**
* Turn a string of base64 characters into an NSData *without decoding*.
* This is to allow HMAC to be computed of the raw base64 string.
*/
public class func dataFromBase64(_ b64: String) -> Data? {
return b64.data(using: .ascii, allowLossyConversion: false)
}
}