Dactyloidae iOS initial commit

mobile/ios/Client/Extensions/NSURLExtensionsMailTo.swift

@@ -0,0 +1,55 @@
+/* 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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+
+/**
+ *  Data structure containing metadata associated with a mailto: link. For additional details,
+ *  see RFC 2368 https://tools.ietf.org/html/rfc2368
+ */
+public struct MailToMetadata {
+    public let to: String
+    public let headers: [String: String]
+}
+
+public extension URL {
+
+    /**
+     Extracts the metadata associated with a mailto: URL according to RFC 2368
+     https://tools.ietf.org/html/rfc2368
+     */
+    func mailToMetadata() -> MailToMetadata? {
+        guard scheme == "mailto" else {
+            return nil
+        }
+        let urlString = absoluteString
+
+        // Extract 'to' value
+        let toStart = urlString.characters.index(urlString.startIndex, offsetBy: "mailto:".characters.count)
+        let toEnd = urlString.characters.index(of: "?") ?? urlString.endIndex
+
+        let to = urlString.substring(with: toStart..<toEnd)
+
+        guard toEnd != urlString.endIndex else {
+            return MailToMetadata(to: to, headers: [String: String]())
+        }
+
+        // Extract headers
+        let headersString = urlString.substring(with: urlString.index(toEnd, offsetBy: 1)..<urlString.endIndex)
+        var headers = [String: String]()
+        let headerComponents = headersString.components(separatedBy: "&")
+
+        headerComponents.forEach { headerPair in
+            let components = headerPair.components(separatedBy: "=")
+            guard components.count == 2 else {
+                return
+            }
+
+            let (hname, hvalue) = (components[0], components[1])
+            headers[hname] = hvalue
+        }
+
+        return MailToMetadata(to: to, headers: headers)
+    }
+}