Client Options

Next, we will talk about the Client.
The Client has several options.

const client = new Client({
    ...
});

For example, storage for the data we discussed before, OBS Endpoint, Endpoint for communication, customFetch for cors and proxies, RateLimitter for rate limiting, etc.

I'll explain it to you one by one.

Storage

This is storage for internal needs such as decryption keys and caches. 　 By default, MemoryStorage is used, and once you stop the program, you must log in from the beginning.

You can use FileStorage there.

import { FileStorage } from "@evex/linejs/storage";

const client = new Client({
    storage: new FileStorage("./storage.json"), // path to storage file (This is secret file)
});

If you want to store in your cloud or storages with your data storage API, you can extend BaseStorage to create something of your liking.
I'd like to give you more details on our server.

OBS Endpoint

OBS stands for OBject Storage and is the CDN where LINE stores images and videos.
There are several endpoints.
If you want to change the endpoints you can do so as follows

import { LINE_OBS } from "@evex/linejs/utils";

const client = new Client({
    LINE_OBS: new LINE_OBS("https://obs.line-scdn.net/"),
});

TIP

Wait a minute, do you care about @evex/linejs/utils? It contains useful things like search functions for OpenChat, internal URL construction functions, etc. Later.

Endpoint

The endpoints of communication.
There is no need to change this point.
If you want to try out a proxied server, use it.

const client = new Client({
    endpoint: "gw.line.naver.jp"
});

Custom Fetch

This is for cors avoidance or proxy. You define a function that replaces fetch.

...

const client = new Client({
    customFetch: async (url, options) => {
        return await fetch(url, {
            ...options,
            ...proxyAgent
        });
    }
});

RateLimitter

It is a safeguard to ensure that you are not restricted by the Square (OpenChat) by a series of posts.
The default is 9 posts per 2 seconds.
If you want to make it stricter, you can change it.

import { RateLimitter } from "@evex/linejs/rate-limit";

const client = new Client({
    squareRateLimitter: new RateLimitter(4, 2000),
});

This will bring the total to 4 posts per 2 seconds.

This concludes the explanation of options!
Next, we will discuss @evex/linejs/utils as an extra.