libredirect/src/pages/background/background.js

"use strict"

import generalHelper from "../../assets/javascripts/general.js"
import utils from "../../assets/javascripts/utils.js"
import servicesHelper from "../../assets/javascripts/services.js"

window.browser = window.browser || window.chrome

function initDefaults() {
	browser.storage.local.clear(() => {
		fetch("/instances/blacklist.json")
			.then(response => response.text())
			.then(async data => {
				browser.storage.local.set({ blacklists: JSON.parse(data) }, async () => {
					await generalHelper.initDefaults()
					await servicesHelper.initDefaults()
				})
			})
	})
}

browser.runtime.onInstalled.addListener(details => {
	switch (details.reason) {
		case "install":
			initDefaults()
			break
		case "update":
			fetch("/instances/blacklist.json")
				.then(response => response.text())
				.then(async data => {
					browser.storage.local.set({ blacklists: JSON.parse(data) }, async () => {
						switch (details.previousVersion) {
							case "2.2.0":
							case "2.2.1":
								await generalHelper.initDefaults()
								await servicesHelper.initDefaults()
								await servicesHelper.upgradeOptions()
								break
							default:
								await servicesHelper.processUpdate()
						}
					})
				})
	}
})

let BYPASSTABs = []
browser.webRequest.onBeforeRequest.addListener(
	details => {
		const url = new URL(details.url)
		if (new RegExp(/^chrome-extension:\/{2}.*\/instances\/.*.json$/).test(url.href) && details.type == "xmlhttprequest") return
		let initiator
		try {
			if (details.originUrl) initiator = new URL(details.originUrl)
			else if (details.initiator) initiator = new URL(details.initiator)
		} catch {
			return null
		}

		let newUrl = servicesHelper.redirect(url, details.type, initiator)

		if (details.frameAncestors && details.frameAncestors.length > 0 && generalHelper.isException(new URL(details.frameAncestors[0].url))) newUrl = null

		if (generalHelper.isException(url)) newUrl = "BYPASSTAB"
		if (BYPASSTABs.includes(details.tabId)) newUrl = null

		if (newUrl) {
			if (newUrl === "CANCEL") {
				console.log(`Canceled ${url}`)
				return { cancel: true }
			}
			if (newUrl === "BYPASSTAB") {
				console.log(`Bypassed ${details.tabId} ${url}`)
				if (!BYPASSTABs.includes(details.tabId)) BYPASSTABs.push(details.tabId)
				return null
			}
			console.info("Redirecting", url.href, "=>", newUrl)
			return { redirectUrl: newUrl }
		}
		return null
	},
	{ urls: ["<all_urls>"] },
	["blocking"]
)

browser.tabs.onRemoved.addListener(tabId => {
	const i = BYPASSTABs.indexOf(tabId)
	if (i > -1) {
		BYPASSTABs.splice(i, 1)
		console.log("Removed BYPASSTABs", tabId)
	}
})

/*
browser.webRequest.onHeadersReceived.addListener(
	e => {
		let response = youtubeHelper.removeXFrameOptions(e)
		if (!response) response = twitterHelper.removeXFrameOptions(e)
		return response
	},
	{ urls: ["<all_urls>"] },
	["blocking", "responseHeaders"]
)
*/

async function redirectOfflineInstance(url, tabId) {
	let newUrl = await servicesHelper.switchInstance(url, true)

	if (newUrl) {
		if (counter >= 5) {
			browser.tabs.update(tabId, {
				url: `/pages/errors/instance_offline.html?url=${encodeURIComponent(newUrl)}`,
			})
			counter = 0
		} else {
			browser.tabs.update(tabId, { url: newUrl })
			counter++
		}
	}
}
let counter = 0

function isAutoRedirect() {
	return new Promise(resolve => browser.storage.local.get("options", r => resolve(r.options.autoRedirect == true)))
}

browser.webRequest.onResponseStarted.addListener(
	async details => {
		if (!(await isAutoRedirect())) return null
		if (details.type == "main_frame" && details.statusCode >= 500) redirectOfflineInstance(new URL(details.url), details.tabId)
	},
	{ urls: ["<all_urls>"] }
)

browser.webRequest.onErrorOccurred.addListener(
	async details => {
		if (!(await isAutoRedirect())) return
		if (details.type == "main_frame") redirectOfflineInstance(new URL(details.url), details.tabId)
	},
	{ urls: ["<all_urls>"] }
)

browser.commands.onCommand.addListener(command => {
	if (command === "switchInstance") utils.switchInstance()
	else if (command == "copyRaw") utils.copyRaw()
	else if (command == "unify") utils.unify()
})

browser.contextMenus.create({
	id: "settings",
	title: browser.i18n.getMessage("Settings"),
	contexts: ["browser_action"],
})

browser.contextMenus.create({
	id: "switchInstance",
	title: browser.i18n.getMessage("switchInstance"),
	contexts: ["browser_action"],
})

browser.contextMenus.create({
	id: "copyRaw",
	title: browser.i18n.getMessage("copyRaw"),
	contexts: ["browser_action"],
})

browser.contextMenus.create({
	id: "unify",
	title: browser.i18n.getMessage("unifySettings"),
	contexts: ["browser_action"],
})

browser.contextMenus.onClicked.addListener(info => {
	if (info.menuItemId == "switchInstance") utils.switchInstance()
	else if (info.menuItemId == "settings") browser.runtime.openOptionsPage()
	else if (info.menuItemId == "copyRaw") utils.copyRaw()
	else if (info.menuItemId == "unify") utils.unify()
})

browser.runtime.onMessage.addListener((message, sender, sendResponse) => {
	if (message.function === "unify") utils.unify(false).then(r => sendResponse({ response: r }))
	return true
})