feat: Drag & Drop Upload mit Ordner-Unterstuetzung

Dateien und komplette Verzeichnisse koennen jetzt hochgeladen werden:

Drag & Drop:
- Dateien per Drag & Drop auf den Datei-Explorer ziehen
- Ganze Ordner (inkl. Unterordner) per Drag & Drop hochladen
- Visuelles Overlay zeigt Drop-Zone an
- Ordnerstruktur wird automatisch auf dem Server nachgebildet

Buttons:
- "Dateien" Button: Mehrere Dateien auswaehlen (wie vorher)
- "Ordner" Button: Kompletten Ordner mit Unterordnern hochladen
  (nutzt webkitdirectory API)

Upload-Fortschritt:
- Fortschrittsbalken mit Datei-Zaehler waehrend des Uploads
- Fehlerhafte Uploads werden gezaehlt und gemeldet

Backend: /files/ensure-path Endpunkt erstellt verschachtelte
Ordnerstrukturen (z.B. "Docs/Work/Project") in einem Aufruf

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/files.py

@@ -126,6 +126,46 @@ def create_folder():
     return jsonify(folder.to_dict()), 201
 
 
+def _ensure_folder_path(user_id, parent_id, path_parts):
+    """Create nested folder structure. Returns the ID of the deepest folder."""
+    current_parent = parent_id
+    for part in path_parts:
+        part = part.strip()
+        if not part:
+            continue
+        existing = File.query.filter_by(
+            owner_id=user_id, parent_id=current_parent, name=part, is_folder=True
+        ).first()
+        if existing:
+            current_parent = existing.id
+        else:
+            folder = File(owner_id=user_id, parent_id=current_parent, name=part, is_folder=True)
+            db.session.add(folder)
+            db.session.flush()
+            current_parent = folder.id
+    return current_parent
+
+
+@api_bp.route('/files/ensure-path', methods=['POST'])
+@token_required
+def ensure_folder_path():
+    """Create nested folder structure from a path string like 'Docs/Work/Project'.
+    Returns the ID of the deepest folder."""
+    user = request.current_user
+    data = request.get_json()
+    path = data.get('path', '').strip().strip('/')
+    parent_id = data.get('parent_id', None)
+
+    if not path:
+        return jsonify({'folder_id': parent_id}), 200
+
+    parts = [p for p in path.split('/') if p.strip()]
+    folder_id = _ensure_folder_path(user.id, parent_id, parts)
+    db.session.commit()
+
+    return jsonify({'folder_id': folder_id}), 200
+
+
 # --- Upload ---
 
 @api_bp.route('/files/upload', methods=['POST'])

frontend/src/views/FilesView.vue

@@ -1,5 +1,16 @@
 <template>
-  <div class="view-container">
+  <div class="view-container"
+       @dragover.prevent="onDragOver" @dragleave.prevent="onDragLeave"
+       @drop.prevent="onDrop">
+
+    <!-- Drop overlay -->
+    <div v-if="isDragging" class="drop-overlay">
+      <div class="drop-content">
+        <i class="pi pi-cloud-upload"></i>
+        <p>Dateien oder Ordner hier ablegen</p>
+      </div>
+    </div>
+
     <div class="view-header">
       <div class="breadcrumb">
         <a @click="navigateTo(null)" class="crumb">Dateien</a>
@@ -10,11 +21,22 @@
       </div>
       <div class="header-actions">
         <Button icon="pi pi-folder-plus" label="Neuer Ordner" size="small" outlined @click="showNewFolder = true" />
-        <Button icon="pi pi-upload" label="Hochladen" size="small" @click="triggerUpload" />
+        <Button icon="pi pi-upload" label="Dateien" size="small" @click="triggerUpload" />
+        <Button icon="pi pi-folder" label="Ordner" size="small" outlined @click="triggerFolderUpload" />
         <input ref="fileInput" type="file" multiple hidden @change="handleUpload" />
+        <input ref="folderInput" type="file" hidden webkitdirectory @change="handleFolderUpload" />
       </div>
     </div>
 
+    <!-- Upload progress -->
+    <div v-if="uploadQueue.length" class="upload-progress">
+      <div class="upload-info">
+        <i class="pi pi-spin pi-spinner"></i>
+        <span>{{ uploadCurrent }} / {{ uploadTotal }} Dateien hochgeladen</span>
+      </div>
+      <ProgressBar :value="uploadPercent" />
+    </div>
+
     <DataTable
       :value="filesStore.files"
       :loading="filesStore.loading"
@@ -198,6 +220,7 @@ import InputText from 'primevue/inputtext'
 import Password from 'primevue/password'
 import Tag from 'primevue/tag'
 import Select from 'primevue/select'
+import ProgressBar from 'primevue/progressbar'
 
 const route = useRoute()
 const router = useRouter()
@@ -205,6 +228,12 @@ const filesStore = useFilesStore()
 const toast = useToast()
 
 const fileInput = ref(null)
+const folderInput = ref(null)
+const isDragging = ref(false)
+const uploadQueue = ref([])
+const uploadCurrent = ref(0)
+const uploadTotal = ref(0)
+const uploadPercent = ref(0)
 const showNewFolder = ref(false)
 const newFolderName = ref('')
 const showRename = ref(false)
@@ -285,21 +314,167 @@ function triggerUpload() {
   fileInput.value?.click()
 }
 
-async function handleUpload(event) {
+function triggerFolderUpload() {
-  const uploadFiles = event.target.files
+  folderInput.value?.click()
-  if (!uploadFiles.length) return
+}
 
-  for (const file of uploadFiles) {
+async function handleUpload(event) {
-    try {
+  const files = Array.from(event.target.files)
-      await filesStore.uploadFile(file, currentParentId())
+  if (!files.length) return
-      toast.add({ severity: 'success', summary: `${file.name} hochgeladen`, life: 3000 })
+  await uploadFilesWithProgress(files.map(f => ({ file: f, relativePath: null })))
-    } catch (err) {
-      toast.add({ severity: 'error', summary: `Fehler: ${file.name}`, detail: err.response?.data?.error, life: 5000 })
-    }
-  }
   event.target.value = ''
 }
 
+async function handleFolderUpload(event) {
+  const files = Array.from(event.target.files)
+  if (!files.length) return
+  // webkitRelativePath gives us "FolderName/sub/file.txt"
+  const items = files.map(f => ({
+    file: f,
+    relativePath: f.webkitRelativePath || null,
+  }))
+  await uploadFilesWithProgress(items)
+  event.target.value = ''
+}
+
+// --- Drag & Drop ---
+let dragCounter = 0
+
+function onDragOver(e) {
+  isDragging.value = true
+}
+
+function onDragLeave(e) {
+  dragCounter--
+  if (dragCounter <= 0) {
+    isDragging.value = false
+    dragCounter = 0
+  }
+}
+
+async function onDrop(e) {
+  isDragging.value = false
+  dragCounter = 0
+
+  const items = []
+
+  if (e.dataTransfer.items) {
+    // Use DataTransferItem API for directory support
+    const entries = []
+    for (const item of e.dataTransfer.items) {
+      if (item.kind === 'file') {
+        const entry = item.webkitGetAsEntry?.() || item.getAsEntry?.()
+        if (entry) {
+          entries.push(entry)
+        }
+      }
+    }
+
+    // Recursively read all entries
+    for (const entry of entries) {
+      await readEntry(entry, '', items)
+    }
+  } else {
+    // Fallback: flat file list
+    for (const file of e.dataTransfer.files) {
+      items.push({ file, relativePath: null })
+    }
+  }
+
+  if (items.length) {
+    await uploadFilesWithProgress(items)
+  }
+}
+
+async function readEntry(entry, parentPath, items) {
+  if (entry.isFile) {
+    const file = await new Promise((resolve, reject) => entry.file(resolve, reject))
+    const relativePath = parentPath ? `${parentPath}/${entry.name}` : null
+    items.push({ file, relativePath })
+  } else if (entry.isDirectory) {
+    const dirPath = parentPath ? `${parentPath}/${entry.name}` : entry.name
+    const reader = entry.createReader()
+    // readEntries may need to be called multiple times
+    let allEntries = []
+    const readBatch = () => new Promise((resolve, reject) => reader.readEntries(resolve, reject))
+    let batch
+    do {
+      batch = await readBatch()
+      allEntries = allEntries.concat(batch)
+    } while (batch.length > 0)
+
+    for (const child of allEntries) {
+      await readEntry(child, dirPath, items)
+    }
+  }
+}
+
+// --- Upload with progress + folder creation ---
+async function uploadFilesWithProgress(items) {
+  uploadTotal.value = items.length
+  uploadCurrent.value = 0
+  uploadPercent.value = 0
+  uploadQueue.value = items
+
+  // Group by directory path -> create folders first
+  const pathCache = {} // "dir/subdir" -> folder_id
+
+  let errors = 0
+  for (const item of items) {
+    try {
+      let targetParentId = currentParentId()
+
+      if (item.relativePath) {
+        // Extract directory part: "Folder/Sub/file.txt" -> "Folder/Sub"
+        const parts = item.relativePath.split('/')
+        parts.pop() // remove filename
+        const dirPath = parts.join('/')
+
+        if (dirPath && !pathCache[dirPath]) {
+          const res = await apiClient.post('/files/ensure-path', {
+            path: dirPath,
+            parent_id: currentParentId(),
+          })
+          pathCache[dirPath] = res.data.folder_id
+
+          // Also cache parent paths
+          for (let i = 1; i < parts.length; i++) {
+            const subPath = parts.slice(0, i).join('/')
+            if (!pathCache[subPath]) {
+              const subRes = await apiClient.post('/files/ensure-path', {
+                path: subPath,
+                parent_id: currentParentId(),
+              })
+              pathCache[subPath] = subRes.data.folder_id
+            }
+          }
+        }
+
+        if (dirPath) {
+          targetParentId = pathCache[dirPath]
+        }
+      }
+
+      await filesStore.uploadFile(item.file, targetParentId)
+    } catch (err) {
+      errors++
+    }
+
+    uploadCurrent.value++
+    uploadPercent.value = Math.round((uploadCurrent.value / uploadTotal.value) * 100)
+  }
+
+  uploadQueue.value = []
+
+  if (errors > 0) {
+    toast.add({ severity: 'warn', summary: `${uploadCurrent.value - errors} hochgeladen, ${errors} Fehler`, life: 5000 })
+  } else {
+    toast.add({ severity: 'success', summary: `${uploadCurrent.value} Dateien hochgeladen`, life: 3000 })
+  }
+
+  await filesStore.loadFiles(currentParentId())
+}
+
 async function createFolder() {
   if (!newFolderName.value.trim()) return
   try {
@@ -460,7 +635,23 @@ onMounted(() => {
 </script>
 
 <style scoped>
-.view-container { padding: 1.5rem; }
+.view-container { padding: 1.5rem; position: relative; min-height: 400px; }
+.drop-overlay {
+  position: absolute; inset: 0; z-index: 100;
+  background: rgba(var(--p-primary-500-rgb, 59, 130, 246), 0.08);
+  border: 3px dashed var(--p-primary-color);
+  border-radius: 12px;
+  display: flex; align-items: center; justify-content: center;
+  pointer-events: none;
+}
+.drop-content { text-align: center; color: var(--p-primary-color); }
+.drop-content i { font-size: 3rem; }
+.drop-content p { font-size: 1.1rem; font-weight: 500; margin: 0.5rem 0 0; }
+.upload-progress {
+  background: var(--p-surface-0); border-radius: 8px; padding: 0.75rem 1rem;
+  margin-bottom: 1rem; border: 1px solid var(--p-surface-200);
+}
+.upload-info { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.5rem; font-size: 0.875rem; }
 .view-header {
   display: flex;
   align-items: center;