mrmBot-Matrix/utils/imagedetect.js

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const fetch = require("node-fetch");
const fileType = require("file-type");
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const { promisify } = require("util");
const writeFile = promisify(require("fs").writeFile);
const execPromise = promisify(require("child_process").exec);
const urlRegex = /(?:\w+:)?\/\/(\S+)/;
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// this checks if the file is, in fact, an image
const typeCheck = async (image, gifv = false) => {
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// download the file to a buffer
const imageRequest = await fetch(image);
const imageBuffer = await imageRequest.buffer();
try {
// get the file type
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const imageType = await fileType.fromBuffer(imageBuffer);
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// 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)) {
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// 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);
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const payload = {
data: imageBuffer,
type: imageType.ext !== "mp4" ? (imageType.ext === "jpg" ? "jpeg" : imageType.ext) : "gif",
path: path
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};
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if (gifv) 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;
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} else {
// if not, then return false
return false;
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}
} catch (error) {
throw error;
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}
};
// this checks for the latest message containing an image and returns the url of the image
module.exports = async (cmdMessage) => {
// we start by getting the messages
const messages = await cmdMessage.channel.getMessages();
// iterate over each message
for (const message of messages) {
// check the attachments first
if (message.embeds.length !== 0) {
// embeds can have 2 possible entries with images, we check the thumbnail first
if (message.embeds[0].type === "gifv") {
const type = await typeCheck(message.embeds[0].video.url, true);
if (type === false) continue;
return type;
} else if (message.embeds[0].thumbnail) {
const type = await typeCheck(message.embeds[0].thumbnail.proxy_url);
if (type === false) continue;
return type;
// if there isn't a thumbnail check the image area
} else if (message.embeds[0].image) {
const type = await typeCheck(message.embeds[0].image.proxy_url);
if (type === false) continue;
return type;
}
} else if (message.attachments.length !== 0) {
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// get type of file
const type = await typeCheck(message.attachments[0].proxy_url);
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// move to the next message if the file isn't an image
if (type === false) continue;
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// if the file is an image then return it
return type;
// 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
const type = await typeCheck(url[0]);
// move to the next message if the file isn't an image
if (type === false) continue;
// if the file is an image then return it
return type;
// if there's no urls then check the embeds
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}
}
};