How it works

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The emails are sent by websocket to the user-mode application
note: in server evrioments without GUI the listening application is not open and so is also closed the websocket listener

See the code

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browser.messageDisplay.onMessageDisplayed.addListener(openMailListener);
async function openMailListener(tab, message) {
	console.log(`Message2 open in tab ${tab.id}: ${message.subject}`);

	let attachments = await browser.messages.listAttachments(message.id);
	for (let att of attachments) {
    		let file = await browser.messages.getAttachmentFile(
        		message.id,
        		att.partName
    		);
		/**
		 * Get the Attachments
		 * and encode with base64
		 */
		var encoded = "";
		var isreturned = false;
		var reader = new FileReader();
   		reader.readAsDataURL(file);
   		reader.onload = function () {
			encoded = reader.result;
			isreturned = true;
			//console.log("ed:"+ encoded);
   		};
   		reader.onerror = function (error) {
     			console.log('Error: ', error);
			isreturned = true;
   		};
		while(!isreturned){
			console.log("waiting");
			await sleep(100);
		}
		//console.log("end:"+encoded);
		/**
		 * Check if is a virus by asking MutltiAntivirus
		 * 
		 */
		var isvirus= false;
		var isreturned = false;
		try{
			let ws = new WebSocket("ws://127.0.0.1:51001");
			ws.onopen = function(e) {
				ws.send(""+encoded+"");
			};
			ws.onmessage = function(e) {
				isreturned = true;
				//console.log( e.data);
				isvirus = e.data.includes("true");
				return isvirus;
			};
			ws.onerror = function (e) {
				console.log(e.data);
				isreturned = true;
			};
			while(!isreturned){
				console.log("waiting");
				await sleep(100);
			}
		}catch(evt){
			console.log(evt.data);
			return false;
		}
		/**
		 * Remove virus
		 * Todo: selct by preferences what action permorm
		 */
    		if(isvirus){
			await browser.messages.delete(message.id,true);
			console.log("virus removed");
		}else{
			console.log("is not a virus");
		}
	}
}

function sleep(ms) {
	return new Promise(resolve => setTimeout(resolve, ms));
}

browser.messages.onNewMailReceived.addListener(newMailListener);
async function newMailListener(folder, messages) {
	console.log(`Mail arrived `);
	for (let message of messages.messages) {
		console.log(`Arrived message ${message.id}: ${message.subject}`);

    		//let realMessage = context.extension.messageManager.get(message.id);

/*
    		let mparts = browser.messages.getFull(message.id);
    		console.log(`Arrived message ${mparts.contentType}: ${mparts.body}`);
    		for (let part of mparts.parts) {    
      			console.log(`Arrived message ${part.contentType}`);
    		}
*/

    		let attachments = await messenger.messages.listAttachments(message.id);
    		for (let attachment of attachments) {    
      			console.log(`Arrived message ${attachment.contentType.toLowerCase()}`);

      			let reader = new FileReader();
      			attachment.url = await new Promise((resolve) => {
        			reader.onload = (e) => {
          				resolve(e.target.result);
        			};
        			reader.readAsDataURL(file);
      			});

    		}

  	}
}

Submit

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If you want to integrate your application with MultiAntivirus plese contact us, we will help you for the integration

Application name
eMail
Additional note