Reddit Auth (*.reddit.com only) のソースコード

Reddit Auth (*.reddit.com only)

Handle authentication for Reddit, and provide some helper functions for cookies and tokens.

このスクリプトは単体で利用できません。右のようなメタデータを含むスクリプトから、ライブラリとして読み込まれます: // @require https://update.greasyfork.org/scripts/575868/1812157/Reddit%20Auth%20%28%2Aredditcom%20only%29.js

このスクリプトの質問や評価の投稿はこちら、通報はこちらへお寄せください

右端で折り返す

// ==UserScript==
// @name        Reddit Auth (*.reddit.com only)
// @namespace   https://greasyfork.org/en/users/1574555-littux
// @version     1.0.1
// @description Handle authentication for Reddit, and provide some helper functions for cookies and tokens.
// @author      littux
// @match       https://*.reddit.com/*
// @grant       GM_xmlhttpRequest
// @connect     www.reddit.com
// @icon        https://b.thumbs.redditmedia.com/7GVLmrH9CdZeqXceSEWkmL8_DSUKRGUfwMxnUNh8D8A.png
// @license     GPL-3.0-only
// @run-at      document-start
// ==/UserScript==

unsafeWindow.__littuxUserscripts__ ??= {};
const userScripts = unsafeWindow.__littuxUserscripts__;

const gmFetch = (options) => {
	return new Promise((resolve, reject) => {
		GM_xmlhttpRequest({
			...options,
			onload: (res) => resolve(res),
			onerror: (err) => reject(err)
		});
	});
}

/** "ping" a URL to get its cookies by pretending to fetch an image */
const pingURL = (url) => {
	return new Promise((resolve) => {
		const img = new Image();
		img.onload = () => resolve();
		img.onerror = () => resolve();
		img.src = url + (url.includes("?") ? "&" : "?") + "v=" + Date.now();
	});
}

const getCookie = async (name) => {
	if (typeof window.cookieStore?.get === "function") {
		return (await cookieStore.get(name))?.value ?? null;
	}
	const cookie = "; " + document.cookie + ";";
	const searchPattern = "; " + name + "=";
	const patternStartIndex = cookie.indexOf(searchPattern);
	if (patternStartIndex === -1) return null;

	const valueStartIndex = patternStartIndex + searchPattern.length;

	return decodeURIComponent(
		cookie.substring(
			valueStartIndex, cookie.indexOf(";", valueStartIndex)
		)
	);
};

const getCookiePing = async (name, pingSrc) => {
	let cookieData = await getCookie(name);
	if (!cookieData) {
		await pingURL(pingSrc);
		cookieData = await getCookie(name);
		if (!cookieData) throw new Error("Failed getting cookie '" + name + "' by fetching " + pingSrc);
	}
	return cookieData;
}


const _getToken = async () => {
	userScripts.loid ??= await getCookie("loid");
	userScripts.tokenKey ??= "rAPI:accessToken~"+userScripts.loid, userScripts.expiryKey ??= "rAPI:accessTokenExpiry~"+userScripts.loid; // Seperate tokens for different users

	let token = localStorage.getItem(userScripts.tokenKey);
	let expiry = Number(localStorage.getItem(userScripts.expiryKey));
	if (token && expiry > Date.now()) return token;

	try {
		const response = await gmFetch({
			anonymous: false,
			method: "POST",
			url: "https://www.reddit.com/svc/shreddit/token",
			headers: {
				"Content-Type": "application/json",
				"origin": "https://www.reddit.com" // 403 if this isn't included
			},
			data: JSON.stringify({ csrf_token: await getCookiePing("csrf_token", "https://sh.reddit.com/404") })
		});

		if (response.status === 200) {
			const data = JSON.parse(response.responseText);
			token = data.token;
			expiry = data.expires;
		} else {
			alert(`Error "${response.status}" while attempting to fetch authentication headers (redditNativeTranslations)`);
		}
	} catch (e) {
		console.debug("Authentication token fetch error:", e);
	}

	// Save to cache
	localStorage.setItem(userScripts.tokenKey, token);
	localStorage.setItem(userScripts.expiryKey, expiry.toString());
	console.log("Saved new auth token to cache.");
	return token;
};

const getToken = async () => {
	if (userScripts.pendingTokenPromise) return userScripts.pendingTokenPromise;
	return userScripts.pendingTokenPromise = _getToken().finally(() => {
		userScripts.pendingTokenPromise = null;
	});
};