feat: text to image impl (#6437)

fix CLOUD-18
fix CLOUD-28
fix CLOUD-29

packages/backend/server/src/plugins/copilot/message.ts

@@ -0,0 +1,35 @@
+import { randomUUID } from 'node:crypto';
+
+import { Injectable, Logger } from '@nestjs/common';
+
+import { SessionCache } from '../../fundamentals';
+import { SubmittedMessage, SubmittedMessageSchema } from './types';
+
+const CHAT_MESSAGE_KEY = 'chat-message';
+const CHAT_MESSAGE_TTL = 3600 * 1 * 1000; // 1 hours
+
+@Injectable()
+export class ChatMessageCache {
+  private readonly logger = new Logger(ChatMessageCache.name);
+  constructor(private readonly cache: SessionCache) {}
+
+  async get(id: string): Promise<SubmittedMessage | undefined> {
+    return await this.cache.get(`${CHAT_MESSAGE_KEY}:${id}`);
+  }
+
+  async set(message: SubmittedMessage): Promise<string | undefined> {
+    try {
+      const parsed = SubmittedMessageSchema.safeParse(message);
+      if (parsed.success) {
+        const id = randomUUID();
+        await this.cache.set(`${CHAT_MESSAGE_KEY}:${id}`, parsed.data, {
+          ttl: CHAT_MESSAGE_TTL,
+        });
+        return id;
+      }
+    } catch (e: any) {
+      this.logger.error(`Failed to get chat message from cache: ${e.message}`);
+    }
+    return undefined;
+  }
+}