fix: harden upload resilience and contracts

app/api/upload/drive/route.ts

@@ -8,7 +8,12 @@ import {
   findNextVersion,
 } from '@/lib/nextcloud'
 import { acquireUploadLock, releaseUploadLock } from '@/lib/upload-lock'
-import { parseDriveRequestBody } from '@/lib/upload-request'
+import {
+  readDriveRequestBody,
+  uploadErrorMessageResponse,
+  uploadErrorResponse,
+  uploadLockConflictResponse,
+} from '@/lib/upload-request'
 import { getErrorMessage } from '@/lib/guards'
 import type { DriveAction } from '@/lib/types'
 
@@ -20,9 +25,9 @@ export async function POST(req: NextRequest) {
   if (authError) return authError
 
   if (!process.env.NEXTCLOUD_URL || !process.env.NEXTCLOUD_SHARE_TOKEN) {
-    return NextResponse.json(
-      { success: false, error: 'Nextcloud non configure sur le serveur (NEXTCLOUD_URL, NEXTCLOUD_SHARE_TOKEN)' },
-      { status: 500 },
+    return uploadErrorMessageResponse(
+      'Nextcloud non configure sur le serveur (NEXTCLOUD_URL, NEXTCLOUD_SHARE_TOKEN)',
+      500,
     )
   }
 
@@ -31,23 +36,18 @@ export async function POST(req: NextRequest) {
   let action: DriveAction
 
   try {
-    const body: unknown = await req.json()
-    const parsedBody = parseDriveRequestBody(body)
+    const parsedBody = await readDriveRequestBody(req)
     action = parsedBody.action
     const stagingId = parsedBody.stagingId
     const staged = await readStagedOriginalFiles(stagingId)
     folderName = staged.folderName
     parsedFiles = staged.files
   } catch (err) {
-    const message = getErrorMessage(err)
-    return NextResponse.json({ success: false, error: message }, { status: 400 })
+    return uploadErrorResponse(err, 400)
   }
 
   if (!acquireUploadLock(folderName)) {
-    return NextResponse.json(
-      { success: false, error: 'Un upload est deja en cours pour ce dossier. Patientez quelques secondes.' },
-      { status: 409 },
-    )
+    return uploadLockConflictResponse()
   }
 
   const basePath = process.env.NEXTCLOUD_BASE_PATH || 'Models'
@@ -79,10 +79,7 @@ export async function POST(req: NextRequest) {
     })
   } catch (err) {
     const message = getErrorMessage(err, 'Erreur Nextcloud inconnue')
-    return NextResponse.json(
-      { success: false, error: `Drive echoue: ${message}` },
-      { status: 500 },
-    )
+    return uploadErrorMessageResponse(`Drive echoue: ${message}`, 500)
   } finally {
     releaseUploadLock(folderName)
   }