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background.js
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background.js
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const HID_DEVICE_TYPE = 'HID';
const USB_DEVICE_TYPE = 'USB';
const GET_DEVICES_CMD = 'get_devices';
const OPEN_DEVICE_CMD = 'open_device';
const CLOSE_DEVICE_CMD = 'close_device';
// This is used to store device array from getDevices() to avoid local
// variable getting garbage collected.
var globalDevices = {
HID_DEVICE_TYPE: null,
USB_DEVICE_TYPE: null,
};
console.log('Extension service worker background script (background.js)');
// Formats an 8-bit integer `value` in hexadecimal with leading zero.
const hex8 = value => {
return ('00' + value.toString(16)).substr(-2).toUpperCase();
};
// Formats a 16-bit integer `value` in hexadecimal with leading zeros.
const hex16 = value => {
return ('0000' + value.toString(16)).substr(-4).toUpperCase();
};
const canonicalDeviceName = (device, type) => {
return `[${type}] ${hex16(device.vendorId)}:${hex16(device.productId)} ${device.productName}`
}
const addUsbDevice = device => {
console.log(canonicalDeviceName(device, USB_DEVICE_TYPE));
if (self.Notification.permission === 'granted') {
const notificationObject = {
body: 'Click here',
data: { url: 'https://google.com' },
};
if (self.registration.active) {
// https://stackoverflow.com/questions/36828088/serviceworkerregistration-active-not-being-set-first-time-chrome
self.registration.showNotification('USB device');
}
}
};
const addHidDevice = device => {
console.log(canonicalDeviceName(device, HID_DEVICE_TYPE));
if (self.Notification.permission === 'granted') {
const notificationObject = {
body: 'Click here',
data: { url: 'https://google.com' },
};
if (self.registration.active) {
// https://stackoverflow.com/questions/36828088/serviceworkerregistration-active-not-being-set-first-time-chrome
self.registration.showNotification('HID device');
}
}
};
const setUpMessageHandler = () => {
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
console.log('receive msg:', message);
if (message.type != HID_DEVICE_TYPE && message.type != USB_DEVICE_TYPE) {
return true;
}
let cmd = message.cmd;
let data = message.data;
let type = message.type;
let navigatorDeviceObj = type == HID_DEVICE_TYPE ? navigator.hid : navigator.usb;
if (cmd === GET_DEVICES_CMD) {
navigatorDeviceObj.getDevices().then(devices => {
globalDevices[type] = devices;
let rsp = [];
devices.forEach(device => {
rsp.push({ 'name': canonicalDeviceName(device, type) });
});
sendResponse(rsp);
});
} else if (cmd == OPEN_DEVICE_CMD) {
let idx = data;
if (globalDevices[type] === null) {
sendResponse(`globalDevices[${type}] is null, please click \"Get Granted ${type} Devices\" button first`);
} else if (idx >= globalDevices[type].length) {
sendResponse('Not enough num of devices:', globalDevices[type].length);
} else {
globalDevices[type][idx].open().then(() => {
sendResponse(`devices[${idx}] ${canonicalDeviceName(globalDevices[type][idx], type)} opened `, idx);
});
}
} else if (cmd == CLOSE_DEVICE_CMD) {
let idx = data;
if (globalDevices[type] === null) {
sendResponse(`globalDevices[${type}] is null, please click \"Get Granted ${type} Devices\" button first`);
} else if (idx >= globalDevices[type].length) {
sendResponse('Not enough num of devices:', devices.length);
} else {
globalDevices[type][idx].close().then(() => {
sendResponse(`devices[${idx}] ${canonicalDeviceName(globalDevices[type][idx], type)} closed `, idx);
});
}
}
// https://github.com/mozilla/webextension-polyfill/issues/130
return true;
});
}
if (navigator.usb) {
// Add connection event listeners.
navigator.usb.onconnect = console.log;
navigator.usb.ondisconnect = console.log;
// Log granted device permissions to the console.
navigator.usb.getDevices().then(devices => {
console.log('WebUSB is available');
for (const d of devices) {
addUsbDevice(d);
}
});
} else {
console.log('WebUSB not available');
}
if (navigator.hid) {
// Add connection event listeners.
navigator.hid.onconnect = console.log;
navigator.hid.ondisconnect = console.log;
// Log granted device permissions to the console.
navigator.hid.getDevices().then(devices => {
console.log('WebHID is available');
for (const d of devices) {
addHidDevice(d);
}
});
// Set up onMessage handler.
setUpMessageHandler();
} else {
console.log('WebHID not available');
}
// https://stackoverflow.com/questions/66618136/persistent-service-worker-in-chrome-extension
const onUpdate = (tabId, info, tab) => /^https?:/.test(info.url) && findTab([tab]);
findTab();
chrome.runtime.onConnect.addListener(port => {
if (port.name === 'keepAlive') {
setTimeout(() => port.disconnect(), 250e3);
port.onDisconnect.addListener(() => findTab());
}
});
async function findTab(tabs) {
if (chrome.runtime.lastError) { /* tab was closed before setTimeout ran */ }
for (const { id: tabId } of tabs || await chrome.tabs.query({ url: '*://*/*' })) {
try {
await chrome.scripting.executeScript({ target: { tabId }, func: connect });
chrome.tabs.onUpdated.removeListener(onUpdate);
return;
} catch (e) { }
}
chrome.tabs.onUpdated.addListener(onUpdate);
}
function connect() {
chrome.runtime.connect({ name: 'keepAlive' })
.onDisconnect.addListener(connect);
}