src/services/mediaStore.js

import { randomUUID } from "node:crypto";

export class InMemoryMediaStore {
  constructor({ ttlSeconds = 3600 } = {}) {
    this.ttlSeconds = ttlSeconds;
    this.items = new Map();
  }

  save({ buffer, mimeType, extension }) {
    this.cleanup();

    const id = randomUUID();
    const expiresAt = Date.now() + (this.ttlSeconds * 1000);

    this.items.set(id, {
      buffer,
      mimeType,
      extension,
      expiresAt
    });

    return { id, expiresAt };
  }

  get(id) {
    this.cleanup();

    const item = this.items.get(id);
    if (!item) {
      return null;
    }

    return item;
  }

  cleanup() {
    const now = Date.now();

    for (const [id, item] of this.items.entries()) {
      if (item.expiresAt <= now) {
        this.items.delete(id);
      }
    }
  }
}