src/reflex/scanners.ts

import * as us from 'unscan'
import fetch from 'node-fetch'
import { writeFileSync } from 'fs'
import generateFileName from '../utils/temp/generateFileName.js'
import Tesseract from 'node-tesseract-ocr';

interface NSFWSchema { nsfw: boolean }
interface MalwareSchema { safe: boolean }

export async function testNSFW(link: string): Promise<NSFWSchema> {
    let p = await saveAttachment(link)
    let result = await us.nsfw.file(p)
    return result
}

export async function testMalware(link: string): Promise<MalwareSchema> {
    let p = await saveAttachment(link)
    let result = await us.malware.file(p)
    return result
}

export async function saveAttachment(link): Promise<string> {
    const image = (await (await fetch(link)).buffer()).toString('base64')
    let fileName = generateFileName(link.split('/').pop().split('.').pop())
    writeFileSync(fileName, image, 'base64')
    return fileName
}

export async function testLink(link: string): Promise<unknown> {
    return await us.link.scan(link)
}


const linkTypes = {
    "PHISHING": "Links designed to trick users into clicking on them.",
    "DATING": "Dating sites.",
    "TRACKERS": "Websites that store or track personal information.",
    "ADVERTISEMENTS": "Websites only for ads.",
    "FACEBOOK": "Facebook pages. (Facebook has a number of dangerous trackers. Read more on /privacy)",
    "AMP": "AMP pages. (AMP is a technology that allows websites to be served by Google. Read more on /privacy)",
    "FACEBOOK TRACKERS": "Websites that include trackers from Facebook.",
    "IP GRABBERS": "Websites that store your IP address, which shows your approximate location.",
    "PORN": "Websites that include pornography.",
    "GAMBLING": "Gambling sites, often scams.",
    "MALWARE": "Websites which download files designed to break or slow down your device.",
    "PIRACY": "Sites which include illegally downloaded material.",
    "RANSOMWARE": "Websites which download a program that can steal your data and make you pay to get it back.",
    "REDIRECTS": "Sites like bit.ly which could redirect to a malicious site.",
    "SCAMS": "Sites which are designed to trick you into doing something.",
    "TORRENT": "Websites that download torrent files.",
    "HATE": "Websites that spread hate towards groups or individuals.",
    "JUNK": "Websites that are designed to make you waste time.",
}
export { linkTypes };


export async function LinkCheck(message): Promise<string[]> {
    let links = message.content.match(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)/gi) ?? []
    let detections = []
    const promises = links.map(async element => {
        try {
            if (element.match(/https?:\/\/[a-zA-Z]+\.?discord(app)?\.(com|net)\/?/)) return // Also matches discord.net, not enough of a bug
            element = await testLink(element)
        } catch {}
        detections.push({tags: element.tags || [], safe: element.safe})
    });
    await Promise.all(promises);
    let detectionsTypes = detections.map(element => {
        let type = Object.keys(linkTypes).find(type => element.tags.includes(type))
        if (type) return type
        // if (!element.safe) return "UNSAFE"
        return undefined
    }).filter(element => element !== undefined)
    return detectionsTypes
}

export async function NSFWCheck(element): Promise<boolean> {
    try {
        let test = (await testNSFW(element))
        return test.nsfw
    } catch {
        return false
    }
}

export async function SizeCheck(element): Promise<boolean> {
    if (element.height === undefined || element.width === undefined) return true
    if (element.height < 20 || element.width < 20) return false
    return true
}

export async function MalwareCheck(element): Promise<boolean> {
    try {
        return (await testMalware(element)).safe
    } catch {
        return true
    }
}

export function TestString(string, soft, strict): object | null {
    for(let word of strict || []) {
        if (string.toLowerCase().includes(word)) {
            return {word: word, type: "strict"}
        }
    }
    for(let word of soft) {
        for(let word2 of string.match(/[a-z]+/gi) || []) {
            if (word2 === word) {
                return {word: word, type: "strict"}
            }
        }
    }
    return null
}

export async function TestImage(url): Promise<string | null> {
    let text = await Tesseract.recognize(url, {lang: "eng", oem: 1, psm: 3})
    return text;
}