Redis APL provided by app-sdk

[djkato]

What I'm trying to achieve

Use an APL that I don't have to pay another party for . For simple KV storage it should be enough to just use the Redis db that is inlcuded in saleor-platform.

Describe a proposed solution

Add Redis APL as another possible import, and also add an .env switch for it inside apps.

Screenshots or mockups

As per https://docs.saleor.io/docs/3.x/developer/extending/apps/developing-apps/app-sdk/apl#example-implementation someone already wrote how to make it, so just use that in app-sdk :) Code snippet from the docs:

import { createClient } from "redis";
import { APL, AuthData } from "@saleor/app-sdk/apl";

const client = createClient();
await client.connect();

/**
 * The APL uses API URL as a key to store and retrieve AuthData.
 * If you intend to use the same Redis instance for multiple Apps,
 * add prefix to the keys to avoid overwriting the data by different apps.
 * Keys will be formatted as below:
 * - `APPID1:http://staging.saleor.io/graphql`
 * - `APPID1:http://demo.saleor.io/graphql`
 * - `APPID2:http://demo.saleor.io/graphql`
 **/
const prepareAuthDataKey = (apiUrl: string) => `${APP_ID}:${apiUrl}`;

const redisAPL: APL = {
  get: async (saleorApiUrl: string) => {
    const response = await client.get(prepareAuthDataKey(saleorApiUrl));
    if (response) {
      return JSON.parse(response);
    }
    return;
  },
  set: async (authData: AuthData) => {
    await client.set(
      prepareAuthDataKey(authData.saleorApiUrl),
      JSON.stringify(authData)
    );
  },
  delete: async (saleorApiUrl: string) => {
    await client.del(prepareAuthDataKey(saleorApiUrl));
  },
  getAll: async () => {
    throw new Exception("Not implemented.");
  },
};