discord_copy_image_urls_to_clipboard.js

(function () {
	// Number of pages to attempt to scroll
	const pages = 1;

	// sleep duration between scrolls in milliseconds.
	// adjust to compensate for network speed.
	const sleepDuration = 500;

	/**
	 * Sleep for duration milliseconds
	 * @param {number} duration
	 * @returns {Promise<void>}
	 */
	function sleep(duration) {
		return new Promise((resolve) => {
			setTimeout(resolve, duration);
		})
	}

	/**
	 * copies a string to the clipboard
	 * @param   {string} value
	 * @returns {string}
	 */
	function copyToClipboard(value) {
		let inp = document.createElement("input");
		document.body.appendChild(inp);
		inp.value = JSON.stringify(urls);
		inp.focus();
		inp.select();

		try {
			document.execCommand("copy");
		} catch (e) {
			console.log(e);
		}

		document.body.removeChild(inp);
	}

	let urls = [];

	// Obtain the channel messages pane
	(async () => {
		let msgs = document.querySelector("div[class*='messages'][class*='scroller']");
		if (!msgs) {
			console.log("could not find message pane");
			return;
		}

		function findImages() {
			msgs.querySelectorAll("img").forEach(x => {
				if (!urls.includes(x.src)) {
					urls.push(x.src);
				}
			});
		}

		if (pages == 1) {
			findImages();
		} else {
			for (let i = 0; i < pages; i++) {
				findImages();
				msgs.scrollTop = 0;
				await sleep(sleepDuration);
			}
		}

		copyToClipboard(JSON.stringify(urls));
	})();
})()