Class WebkitMessagingTransportImplements

Example

On macOS 11+, this will just call through to window.webkit.messageHandlers.x.postMessage

Eg: for a foo message defined in Swift that accepted the payload {"bar": "baz"}, the following would occur:

const json = await window.webkit.messageHandlers.foo.postMessage({ bar: "baz" });
const response = JSON.parse(json)
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Example

On macOS 10 however, the process is a little more involved. A method will be appended to navigator.duckduckgo that allows the response to be delivered there instead. It's not exactly this, but you can visualize the flow as being something along the lines of:

// add the callback method to navigator.duckduckgo
navigator.duckduckgo["_0123456"] = (response) => {
   // decrypt `response` and deliver the result to the caller here
   // then remove the temporary method
   delete navigator.duckduckgo['_0123456']
};

// send the data + `messageHanding` values
window.webkit.messageHandlers.foo.postMessage({
  bar: "baz",
  messagingHandling: {
    methodName: "_0123456",
    secret: "super-secret",
    key: [1, 2, 45, 2],
    iv: [34, 4, 43],
  }
});

// later in swift, the following JavaScript snippet will be executed
(() => {
  navigator.duckduckgo['_0123456']({
    ciphertext: [12, 13, 4],
    tag: [3, 5, 67, 56]
  })
})()
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