Fixed an issue where Base64-encoded key IDs would fail lookups against the known set of keys

Fixes #65

Author: dimitribouniol

Sources/WebPush/Helpers/DataProtocol+Base64URLCoding.swift

@@ -19,7 +19,15 @@ extension DataProtocol {
     func base64URLEncodedString() -> String {
         Data(self)
             .base64EncodedString()
-            .replacingOccurrences(of: "+", with: "-")
+            .transformToBase64URLEncoding()
+    }
+}
+
+extension String {
+    /// Transform a regular Base64 encoded string to a Base64URL encoded one.
+    @usableFromInline
+    func transformToBase64URLEncoding() -> String {
+        self.replacingOccurrences(of: "+", with: "-")
             .replacingOccurrences(of: "/", with: "_")
             .replacingOccurrences(of: "=", with: "")
     }

Sources/WebPush/VAPID/VAPIDKey.swift

@@ -86,7 +86,7 @@ extension VAPID.Key: Identifiable {
 
         public init(from decoder: any Decoder) throws {
             let container = try decoder.singleValueContainer()
-            self.rawValue = try container.decode(String.self)
+            self.rawValue = try container.decode(String.self).transformToBase64URLEncoding()
         }
 
         public func encode(to encoder: any Encoder) throws {