I'm angry that cursor did this correctly

Author: juandjara

app/lib/process-file-param.server.tsx

@@ -0,0 +1,36 @@
+import { STORAGE_PATH } from './config.server'
+import fs from 'fs/promises'
+import path from 'path'
+
+async function fileExists(filename: string) {
+  try {
+    await fs.access(filename, fs.constants.R_OK) // check file exists and is readable
+    return true
+  } catch (err) {
+    return false
+  }
+}
+
+function safeJoin(base: string, file: string) {
+  const file2 = path.join('/', file) // removes all `../` by making the file relative to root `/`
+  return path.join(base, file2)
+}
+
+export default async function processFileParam(
+  request: Request,
+  param: string,
+) {
+  const _file = new URL(request.url).searchParams.get(param) as string
+
+  if (!_file) {
+    throw new Response('missing ?file param', { status: 400 })
+  }
+
+  const file = safeJoin(STORAGE_PATH, _file)
+
+  if (!fileExists(file)) {
+    throw new Response('file not found', { status: 404 })
+  }
+
+  return file
+}

app/lib/unzip-cbz.server.ts

@@ -0,0 +1,22 @@
+import fs from "fs/promises"
+import JSZip from "jszip"
+
+export async function unzipCbz(path: string) {
+  const buf = await fs.readFile(path)
+  const zip = new JSZip()
+  await zip.loadAsync(buf as Uint8Array)
+  const promises = [] as Promise<string>[]
+  zip.forEach((file) => {
+    const f = zip.file(file)
+    if (f) {
+      promises.push(f.async('base64'))
+    }
+  })
+  const files = await Promise.all(promises)
+  return files.map((f, i) => {
+    return {
+      name: Object.keys(zip.files)[i],
+      base64: f,
+    }
+  })
+}