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"use strict";
{
let handlers = new Set();
let dispatch = (msg, sender) => {
let {__meta, _messageName} = msg;
if (!__meta) {
// legacy message from embedder or library? ignore it
if (!_messageName) {
debug(`Message not in NoScript-specific format: %s`, JSON.stringify(msg));
return undefined;
}
__meta = {name: _messageName};
}
let {name} = __meta;
let responderFound = false;
let exception = null;
for (let h of handlers) {
let f = h[name];
if (typeof f === "function") {
let result;
try {
result = f(msg, sender);
} catch (e) {
error(e);
exception = e;
continue;
}
if (typeof result === "undefined") {
responderFound = true;
continue;
}
return (result instanceof Promise) ? result
: new Promise(r => r(result));
}
}
if (exception) throw exception;
if (!responderFound) {
debug("Warning: no handler for message %s %s in context %s", name, JSON.stringify(msg), document.URL);
}
};
var Messages = {
addHandler(handler) {
let originalSize = handlers.size;
handlers.add(handler);
if (originalSize === 0 && handlers.size === 1) {
browser.runtime.onMessage.addListener(dispatch);
}
},
removeHandler(handler) {
let originalSize = handlers.size;
handlers.delete(handler);
if (originalSize === 1 && handlers.size === 0) {
browser.runtime.onMessage.removeListener(dispatch);
}
},
async send(name, args = {}, recipientInfo = null) {
args.__meta = {name, recipientInfo};
args._messageName = name; // legacy protocol, for embedders
if (recipientInfo && "tabId" in recipientInfo) {
let opts;
if ("frameId" in recipientInfo) opts = {frameId: recipientInfo.frameId};
return await browser.tabs.sendMessage(recipientInfo.tabId, args, opts);
}
return await browser.runtime.sendMessage(args);
},
isMissingEndpoint(error) {
return error && error.message ===
"Could not esablish connection. Receiving end does not exist.";
}
}
}
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