feat(aklive2d): add a downloader lib

libs/downloader.js

@@ -0,0 +1,36 @@
+/* eslint-disable no-undef */
+import fetch from "node-fetch"
+import path from "path"
+import { exists, writeSync, readdirSync, rm, readSync } from "./file.js"
+
+export default class Downloader {
+
+    async github(history_url, raw_url, filepath) {
+        const historyResponse = await fetch(history_url)
+        const historyData = await historyResponse.json()
+        const lastCommit = historyData[0]
+        const lastCommitDate = new Date(lastCommit.commit.committer.date)
+        console.log(`Last commit date: ${lastCommitDate.getTime()}`)
+        const basename = path.basename(filepath)
+        const ext = path.extname(filepath)
+        filepath = path.join(filepath, "..", `${basename}_${lastCommitDate.getTime()}${ext}`)
+
+        if (exists(filepath)) {
+            console.log(`${basename} is the latest version.`)
+            return JSON.parse(readSync(filepath))
+        }
+        const response = await fetch(raw_url)
+        const data = await response.json()
+        writeSync(JSON.stringify(data), filepath)
+        console.log(`${basename} is updated.`)
+
+        // remove old file
+        const files = readdirSync(path.join(__projectRoot, __config.folder.operator, __config.folder.share))
+        for (const file of files) {
+            if (file.startsWith(basename) && file !== path.basename(filepath)) {
+                rm(path.join(__projectRoot, __config.folder.operator, __config.folder.share, file))
+            }
+        }
+        return data
+    }
+}