--- a/src/chat.css	Wed Mar 05 15:03:26 2025 -0700
+++ b/src/chat.css	Wed Mar 05 18:43:06 2025 -0700
@@ -167,6 +167,10 @@
 	display: none;
 }
 
+input[type="file"] {
+	display: none;
+}
+
 @media (min-width: 700px) {
 	div[chat_content] {
 		margin-left: calc(3% - 8px);

--- a/src/chat.js	Wed Mar 05 15:03:26 2025 -0700
+++ b/src/chat.js	Wed Mar 05 18:43:06 2025 -0700
@@ -5,6 +5,7 @@
 let eventSource;
 let lastUpdate;
 let userId;
+let filebinUrl;
 
 function evalEvent(event) {
 	// console.log(event);
@@ -288,3 +289,47 @@
 	location = `chat?with=${email}`;
 	ajax(`save_post.js?post=${currentPostId}`,`content=${encodeURIComponent(text)}`);
 }
+
+function uploadFile() {
+	document.querySelector('input[type="file"]').click();
+}
+
+function addFileUrl(url) {
+	let textarea = document.querySelector('div[input] textarea');
+	let text = textarea.value;
+	if( /\S$/.test(text) )
+		text += ' ';
+	text += url;
+	textarea.value = text;
+}
+
+function uploadToFilebin(fileName,fileContent) {
+	//console.log(fileContent.byteLength);
+	let request = new XMLHttpRequest();
+	let url = filebinUrl + fileName;
+	request.open( 'POST', url );
+	request.onload = function() {
+		if( request.status !== 201 ) {
+			let err = 'upload failed: ' + request.status;
+			if( request.responseText ) {
+				err += '\n' + request.responseText;
+			}
+			console.log(err);
+			ajax( '/error_log.js', 'err='+encodeURIComponent(err) );
+			return;
+		}
+		addFileUrl(url);
+	};
+	request.send(fileContent);
+}
+
+function loadedFile(input) {
+	let file = input.files[0];
+	input.value = null;
+	console.log(file);
+	let reader = new FileReader();
+	reader.onload = function() {
+		uploadToFilebin(file.name,reader.result);
+	};
+	reader.readAsArrayBuffer(file);
+}

--- a/src/get_chat.js.luan	Wed Mar 05 15:03:26 2025 -0700
+++ b/src/get_chat.js.luan	Wed Mar 05 18:43:06 2025 -0700
@@ -1,6 +1,8 @@
 local Luan = require "luan:Luan.luan"
 local error = Luan.error
 local ipairs = Luan.ipairs or error()
+local String = require "luan:String.luan"
+local digest_message = String.digest_message or error()
 local Parsers = require "luan:Parsers.luan"
 local json_string = Parsers.json_string or error()
 local Io = require "luan:Io.luan"
@@ -18,10 +20,7 @@
 local logger = Logging.logger "get_chat.js"
 
 
-local function html()
-	local user = current_user() or error()
-	local chat = Http.request.parameters.chat or error()
-	chat = get_chat_by_id(chat) or error()
+local function get_html(user,chat)
 	chat.read(user)
 	local posts = post_search( "post_chat_id:"..chat.id, "id" )
 %>
@@ -48,6 +47,7 @@
 %>
 		<div input>
 			<textarea oninput="fixTextarea(event)" onkeydown="textareaKey(event)"></textarea>
+			<button onclick="uploadFile()" title="Add file"><img src="/images/upload_file.svg"></button>
 			<button onclick="addPost()" title="Send"><img src="/images/send.svg"></button>
 		</div>
 	</div>
@@ -55,8 +55,14 @@
 end
 
 return function()
+	local user = current_user() or error()
+	local chat = Http.request.parameters.chat or error()
+	chat = get_chat_by_id(chat) or error()
+	local html = `get_html(user,chat)`
+	local digest = digest_message("MD5",user.password..chat.id)
 	Io.stdout = Http.response.text_writer()
 %>
-	gotChat(<%=json_string(`html()`)%>);
+	gotChat(<%=json_string(html)%>);
+	filebinUrl = 'https://filebin.net/<%=digest%>/';
 <%
 end

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/images/upload_file.svg	Wed Mar 05 18:43:06 2025 -0700
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 -960 960 960" width="24px" fill="#5f6368"><path d="M440-200h80v-167l64 64 56-57-160-160-160 160 57 56 63-63v167ZM240-80q-33 0-56.5-23.5T160-160v-640q0-33 23.5-56.5T240-880h320l240 240v480q0 33-23.5 56.5T720-80H240Zm280-520v-200H240v640h480v-440H520ZM240-800v200-200 640-640Z"/></svg>
\ No newline at end of file

--- a/src/index.html.luan	Wed Mar 05 15:03:26 2025 -0700
+++ b/src/index.html.luan	Wed Mar 05 18:43:06 2025 -0700
@@ -101,6 +101,7 @@
 				<button onclick="gotoInvite(this)">Close</button>
 			</div>
 		</dialog>
+		<input type="file" required onchange="loadedFile(this)">
 		<script>
 			'use strict';
 

--- a/src/lib/Chat.luan	Wed Mar 05 15:03:26 2025 -0700
+++ b/src/lib/Chat.luan	Wed Mar 05 18:43:06 2025 -0700
@@ -36,6 +36,7 @@
 end
 
 local function get_chat_key(user_ids)
+	#user_ids > 1 or error()
 	sort(user_ids)
 	return concat(user_ids,"~")
 end