refactor: stage uploads before drive and git delivery

app/api/upload/git/route.ts

@@ -1,10 +1,9 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { validateUploadSecret } from '@/lib/auth'
-import { parseMultiUpload } from '@/lib/parse-upload'
 import { getRemoteFolder, pushAllToGitHub } from '@/lib/github'
 import { buildCommitMessage } from '@/lib/commit-message'
 import { classifyFileChanges } from '@/lib/diff-files'
-import { prepareGitAssets } from '@/lib/prepare-git-assets'
+import { cleanupStagingUpload, ensurePreparedStagingAssets, readStagedManifest } from '@/lib/upload-staging'
 import { acquireUploadLock, releaseUploadLock } from '@/lib/upload-lock'
 
 export const runtime = 'nodejs'
@@ -19,14 +18,17 @@ export async function POST(req: NextRequest) {
   const authError = validateUploadSecret(req)
   if (authError) return authError
 
-  // --- Parse all files ---
   let folderName: string
-  let parsedFiles: Awaited<ReturnType<typeof parseMultiUpload>>['files']
+  let stagingId: string
 
   try {
-    const parsed = await parseMultiUpload(req)
-    folderName = parsed.folderName
-    parsedFiles = parsed.files
+    const body = await req.json()
+    stagingId = body.stagingId
+    if (!stagingId || typeof stagingId !== 'string') {
+      throw new Error('stagingId manquant')
+    }
+    const manifest = await readStagedManifest(stagingId)
+    folderName = manifest.folderName
   } catch (err) {
     const message = err instanceof Error ? err.message : 'Erreur inconnue'
     return NextResponse.json({ success: false, error: message }, { status: 400 })
@@ -47,7 +49,7 @@ export async function POST(req: NextRequest) {
       compressed,
       compressionError,
       assetSummaries,
-    } = await prepareGitAssets({ folderName, parsedFiles })
+    } = await ensurePreparedStagingAssets(stagingId)
 
     // --- Detect existing files and classify changes ---
     const folderPath = `public/models/${folderName}`
@@ -67,6 +69,7 @@ export async function POST(req: NextRequest) {
 
     // If nothing changed, don't create an empty commit
     if (changedFilesToPush.length === 0 && deletePaths.length === 0) {
+      await cleanupStagingUpload(stagingId).catch(() => {})
       return NextResponse.json({
         success: true,
         folderName,
@@ -90,6 +93,7 @@ export async function POST(req: NextRequest) {
     // --- Push all in one commit ---
     try {
       const { commitUrl } = await pushAllToGitHub(changedFilesToPush, deletePaths, commitMessage)
+      await cleanupStagingUpload(stagingId).catch(() => {})
 
       return NextResponse.json({
         success: true,