Val Town Basic Chat

Val Town Chat Room

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Welcome to the Chat!

Please enter your desired User ID (Name):

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\n\n \n\n\n`;\n return new Response(html, {\n headers: {\n \"Content-Type\": \"text/html; charset=utf-8\",\n },\n });\n}\n\n// --- Main HTTP Handler ---\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n\n // Standard CORS headers for API use (required for POST requests from the client JS)\n const headers = {\n \"Content-Type\": \"application/json\",\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, POST, OPTIONS\",\n \"Access-Control-Allow-Headers\": \"Content-Type\",\n };\n\n // Handle CORS preflight requests\n if (req.method === \"OPTIONS\") {\n return new Response(null, { status: 204, headers });\n }\n\n // 1. Handle UI Request (GET without the 'since' query parameter)\n if (req.method === \"GET\" && !url.searchParams.has(\"since\")) {\n return generateUI();\n }\n\n // If we reach here, it's an API call (POST or GET with 'since')\n let state: ChatState;\n\n try {\n state = await getChatState();\n } catch (e) {\n console.error(\"Error retrieving state:\", e);\n return Response.json({ error: \"Failed to load chat state\" }, {\n status: 500,\n headers,\n });\n }\n\n // 2. Handle Sending Messages (POST)\n if (req.method === \"POST\") {\n try {\n const body = await req.json();\n let { user_id, message } = body;\n\n // Basic validation and sanitization\n if (\n !user_id || typeof user_id !== \"string\" || user_id.trim().length === 0\n ) {\n return Response.json({ error: \"Missing or invalid user_id\" }, {\n status: 400,\n headers,\n });\n }\n if (\n !message || typeof message !== \"string\" || message.trim().length === 0\n ) {\n return Response.json({ error: \"Missing or invalid message content\" }, {\n status: 400,\n headers,\n });\n }\n\n const content = message.trim().substring(0, 500);\n const user = user_id.trim().substring(0, 50);\n\n const newMessage: ChatMessage = {\n id: state.nextId,\n user: user,\n content: content,\n timestamp: Date.now(),\n };\n\n // Update state\n state.messages.push(newMessage);\n state.nextId += 1;\n\n // Save state\n await setChatState(state);\n\n return Response.json({\n ok: true,\n id: newMessage.id,\n }, { headers });\n } catch (e) {\n console.error(\"Error processing POST request:\", e);\n return Response.json({ error: \"Failed to send message: \" + e.message }, {\n status: 500,\n headers,\n });\n }\n }\n\n // 3. Handle Receiving Messages (GET with 'since')\n if (req.method === \"GET\") {\n try {\n const sinceIdParam = url.searchParams.get(\"since\");\n let sinceId = 0;\n\n if (sinceIdParam) {\n sinceId = parseInt(sinceIdParam, 10);\n if (isNaN(sinceId) || sinceId < 0) {\n return Response.json({\n error: \"Invalid 'since' parameter. Must be a non-negative integer.\",\n }, { status: 400, headers });\n }\n }\n\n // Filter messages based on the 'since' parameter\n const messages = state.messages.filter((msg) => msg.id > sinceId);\n\n // The current max ID is always the previous ID (nextId - 1)\n const currentMaxId = state.nextId - 1;\n\n return Response.json({\n ok: true,\n messages: messages,\n current_max_id: currentMaxId,\n }, { headers });\n } catch (e) {\n console.error(\"Error processing GET request:\", e);\n return Response.json({ error: \"Internal server error\" }, {\n status: 500,\n headers,\n });\n }\n }\n\n // 4. Default / Error\n return Response.json({ error: \"Method not supported.\" }, {\n status: 405,\n headers,\n });\n}","deleted","label",[99],"permalink","https://www.val.town/x/want/untitled-423/code/main.ts","extension","actionData","errors"]