mrmBot-Matrix/utils/imagedetect.js

95 lines
3.7 KiB
JavaScript

const fetch = require("node-fetch");
const AbortController = require("abort-controller");
const fileType = require("file-type");
const { promisify } = require("util");
const { writeFile } = require("fs").promises;
const execPromise = promisify(require("child_process").exec);
const urlRegex = /(?:\w+:)?\/\/(\S+)/;
// this checks if the file is, in fact, an image
const typeCheck = async (image, image2, gifv = false) => {
// download the file to a buffer
const controller = new AbortController();
const timeout = setTimeout(() => {
controller.abort();
}, 25000);
try {
const imageRequest = await fetch(image, { signal: controller.signal });
const imageBuffer = await imageRequest.buffer();
if (imageBuffer.size >= 25 * 1024 * 1024) return;
// get the file type
const imageType = await fileType.fromBuffer(imageBuffer);
// check if the file is a jpeg, png, or webp
const formats = ["image/jpeg", "image/png", "image/webp", "image/gif"];
if (gifv) formats.push("video/mp4");
if (imageType && formats.includes(imageType.mime)) {
// if it is, then return the url with the file type
const path = `/tmp/${Math.random().toString(36).substring(2, 15)}.${imageType.ext}`;
await writeFile(path, imageBuffer);
const payload = {
type: imageType.ext !== "mp4" ? (imageType.ext === "jpg" ? "jpeg" : imageType.ext) : "gif",
path: path,
url: image2
};
if (payload.type === "gif") payload.delay = (await execPromise(`ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate ${path}`)).stdout.replace("\n", "");
return payload;
} else {
// if not, then return false
return false;
}
} catch (error) {
if (error.name === "AbortError") {
throw Error("Timed out");
} else {
throw error;
}
} finally {
clearTimeout(timeout);
}
};
const checkImages = async (message) => {
let type;
// first check the embeds
if (message.embeds.length !== 0) {
// embeds can have 2 possible entries with images, we check the thumbnail first
if (message.embeds[0].type === "gifv") {
type = await typeCheck(message.embeds[0].video.url, message.embeds[0].video.url, true);
} else if (message.embeds[0].thumbnail) {
type = await typeCheck(message.embeds[0].thumbnail.proxy_url, message.embeds[0].thumbnail.url);
// if there isn't a thumbnail check the image area
} else if (message.embeds[0].image) {
type = await typeCheck(message.embeds[0].image.proxy_url, message.embeds[0].image.url);
}
// then check the attachments
} else if (message.attachments.length !== 0) {
// get type of file
type = await typeCheck(message.attachments[0].proxy_url, message.attachments[0].url);
// if there's nothing in the attachments check the urls in the message if there are any
} else if (urlRegex.test(message.content)) {
// get url
const url = message.content.match(urlRegex);
// get type of file
type = await typeCheck(url[0], url[0]);
}
// if the file is an image then return it
return type ? type : false;
};
// this checks for the latest message containing an image and returns the url of the image
module.exports = async (cmdMessage) => {
// we start by checking the current message for images
const result = await checkImages(cmdMessage);
if (result !== false) return result;
// if there aren't any then iterate over the last few messages in the channel
const messages = await cmdMessage.channel.getMessages();
// iterate over each message
for (const message of messages) {
const result = await checkImages(message);
if (result === false) {
continue;
} else {
return result;
}
}
};