70 lines
2.4 KiB
JavaScript
70 lines
2.4 KiB
JavaScript
const {name} = browser.runtime.getManifest();
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console.log(name, "background page loaded");
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browser.runtime.onMessage.addListener((msg, sender, sendResponse) => {
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console.log(name, "background received msg", {msg, sender});
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switch (msg) {
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case "test - sendMessage with returned Promise reply":
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try {
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browser.pageAction.show(sender.tab.id);
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} catch (err) {
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return Promise.resolve(`Unexpected error on pageAction.show: ${err}`);
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}
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return Promise.resolve("bg page reply 1");
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case "test - sendMessage with returned value reply":
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// This is supposed to be ignored and the sender should receive
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// a reply from the second listener.
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return "Unexpected behavior: a plain return value should not be sent as a result";
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case "test - sendMessage with synchronous sendResponse":
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sendResponse("bg page reply 3");
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return "value returned after calling sendResponse synchrously";
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case "test - sendMessage with asynchronous sendResponse":
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setTimeout(() => sendResponse("bg page reply 4"), 50);
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return true;
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case "test - second listener if the first does not reply":
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// This is supposed to be ignored and the sender should receive
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// a reply from the second listener.
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return false;
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case "test - sendMessage with returned rejected Promise with Error value":
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return Promise.reject(new Error("rejected-error-value"));
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case "test - sendMessage with returned rejected Promise with non-Error value":
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return Promise.reject("rejected-non-error-value");
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case "test - sendMessage with returned rejected Promise with non-Error value with message property":
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return Promise.reject({message: "rejected-non-error-message"});
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case "test - sendMessage with listener callback throws":
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throw new Error("listener throws");
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case "test - sendMessage and no listener answers":
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return undefined;
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default:
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return Promise.resolve(
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`Unxpected message received by the background page: ${JSON.stringify(msg)}\n`);
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}
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});
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browser.runtime.onMessage.addListener((msg, sender, sendResponse) => {
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if (msg === "test - sendMessage and no listener answers") {
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return undefined;
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}
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setTimeout(() => {
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sendResponse("second listener reply");
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}, 100);
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return true;
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});
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console.log(name, "background page ready to receive a content script message...");
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