test

backend/drive/spaces.py

@@ -35,12 +35,33 @@ def ensure_space(user):
 def _make_numbered_space(parent, **fields):
     if len(parent.relative_path) + 1 + 24 > 700:
         raise ValueError('Hiérarchie trop profonde.')
+    with transaction.atomic():
         obj = DriveSpace.objects.create(parent=parent, relative_path=f'pending/{secrets.token_hex(10)}', **fields)
-    obj.directory_name = f'{obj.pk - 1:04d}'
-    obj.relative_path = '/'.join(part for part in (parent.relative_path, obj.directory_name) if part)
+        number = obj.pk - 1
+        directory = Path(settings.DRIVE_STORAGE_ROOT) / parent.relative_path
+        directory.mkdir(mode=0o700, parents=True, exist_ok=True)
+        # With real file names, a user may already have created "0001" as a
+        # folder/file. Do NOT reuse it for another person's space.
+        for _ in range(100000):
+            candidate = f'{number:04d}'
+            target = directory / candidate
+            if DriveSpace.objects.filter(directory_name=candidate).exists() or target.exists() or target.is_symlink():
+                number += 1
+                continue
+            try:
+                target.mkdir(mode=0o700)
+            except FileExistsError:
+                number += 1
+                continue
+            try:
+                obj.directory_name = candidate
+                obj.relative_path = '/'.join(part for part in (parent.relative_path, candidate) if part)
                 obj.save(update_fields=['directory_name', 'relative_path'])
-    (Path(settings.DRIVE_STORAGE_ROOT) / obj.relative_path).mkdir(mode=0o700, parents=True, exist_ok=True)
+            except Exception:
+                target.rmdir()
+                raise
             return obj
+        raise ValueError('Aucun numéro de répertoire disponible pour ce nouvel espace.')
 
 
 def create_space(user, parent, display_name, **permissions):
@@ -161,9 +182,6 @@ def storage_path(item):
     return resolved
 
 
-def new_storage_location(space, key):
-    return '/'.join(part for part in (space.relative_path, key[:2], key) if part)
-
 
 def hash_token(token):
     return hashlib.sha256(token.encode('utf-8')).hexdigest()

backend/drive/storage_layout.py

@@ -0,0 +1,114 @@
+"""Store DriveItems as normal filenames beneath their numbered DriveSpace.
+
+All relative paths are inside DRIVE_STORAGE_ROOT. The DB hierarchy is authoritative,
+so a physical folder can be rebuilt from its current DriveItem ancestors.
+"""
+from pathlib import Path
+
+from django.conf import settings
+from django.db import transaction
+
+from .models import DriveItem
+
+
+class NameConflict(ValueError):
+    pass
+
+
+def folder_location(space, parent):
+    parts = []
+    seen = set()
+    while parent is not None:
+        if parent.pk in seen or not parent.is_folder or parent.space_id != space.pk:
+            raise ValueError('Hiérarchie de dossiers invalide.')
+        if parent.name in ('.', '..') or '/' in parent.name or '\\' in parent.name:
+            raise ValueError('Nom de dossier invalide.')
+        seen.add(parent.pk)
+        parts.append(parent.name)
+        parent = parent.parent
+    return '/'.join(part for part in (space.relative_path, *reversed(parts)) if part)
+
+
+def file_location(space, parent, name):
+    return '/'.join(part for part in (folder_location(space, parent), name) if part)
+
+
+def disk_path(location):
+    root = Path(settings.DRIVE_STORAGE_ROOT).resolve()
+    path = root
+    for part in Path(location).parts:
+        if part in ('', '.', '..') or part.startswith('/') or '\\' in part:
+            raise ValueError('Chemin de stockage invalide.')
+        path = path / part
+        if path.is_symlink():
+            raise ValueError('Lien symbolique interdit dans le stockage.')
+    if not path.resolve().is_relative_to(root):
+        raise ValueError('Chemin de stockage hors du répertoire autorisé.')
+    return path
+
+
+def assert_available(space, parent, name, exclude=None):
+    siblings = DriveItem.objects.filter(space=space, parent=parent, name=name)
+    if exclude is not None:
+        siblings = siblings.exclude(pk=exclude)
+    if siblings.exists():
+        raise NameConflict('Un élément portant ce nom existe déjà à cet emplacement (y compris dans la corbeille).')
+    target = disk_path(file_location(space, parent, name))
+    if target.exists() or target.is_symlink():
+        raise NameConflict('Un fichier ou un dossier portant ce nom existe déjà sur le disque.')
+    return target
+
+
+def prepare_parent(space, parent):
+    location = folder_location(space, parent)
+    destination = disk_path(location)
+    destination.mkdir(parents=True, exist_ok=True)
+    return destination
+
+
+def relocate_item(item, new_parent, new_name):
+    """Rename/move a file or folder and its descendants on disk and in SQL.
+
+    The on-disk move is reversed if the database transaction fails. The caller
+    must ensure authorization and that new_parent is not a descendant of item.
+    """
+    old = (file_location(item.space, item.parent, item.name) if item.is_folder
+           else item.storage_location or f'{item.storage_key[:2]}/{item.storage_key}')
+    new = file_location(item.space, new_parent, new_name)
+    source = disk_path(old)
+    target = assert_available(item.space, new_parent, new_name, exclude=item.pk)
+    prepare_parent(item.space, new_parent)
+    if not source.exists():
+        if not item.is_folder:
+            raise FileNotFoundError(f'Fichier source introuvable : {old}')
+        # Historical logical folders had no corresponding physical directory.
+        source.mkdir(parents=True, exist_ok=True)
+    if (not source.is_dir()) if item.is_folder else (not source.is_file()):
+        raise ValueError('Type de fichier incorrect sur le disque.')
+    moved = False
+    try:
+        with transaction.atomic():
+            # Two distinct paths are guaranteed by caller's early unchanged check.
+            source.rename(target)
+            moved = True
+            if item.is_folder:
+                prefix = old.rstrip('/') + '/'
+                affected = list(DriveItem.objects.filter(
+                    space=item.space, storage_location__startswith=prefix
+                ).only('pk', 'storage_location'))
+                for child in affected:
+                    child.storage_location = new + '/' + child.storage_location[len(prefix):]
+                if affected:
+                    DriveItem.objects.bulk_update(affected, ['storage_location'], batch_size=500)
+            else:
+                item.storage_location = new
+            item.name = new_name
+            item.parent = new_parent
+            item.full_clean()
+            item.save()
+    except Exception:
+        if moved:
+            # Do not replace a path created by another operation in the meantime.
+            if target.exists() and not source.exists():
+                target.rename(source)
+        raise

backend/drive/views_items.py

@@ -11,6 +11,7 @@ from .models import DriveItem, DriveSpace
 from .spaces import ensure_space, ensure_private_space, is_admin, resolve_space, can_write_space, can_read_space
 from .quotas import quota_state
 from .services import error, item_info, get_item, chain, readable, writable, valid_name, target_parent, descendant_files
+from .storage_layout import disk_path, file_location, assert_available, prepare_parent, relocate_item, NameConflict
 
 
 @api_view(['GET'])
@@ -87,8 +88,21 @@ def create_folder(request):
         parent=target_parent(request.data.get('parent'),request.user,space)
     except ValueError as ex:return error(str(ex))
     except PermissionError as ex:return error(str(ex),403)
+    with transaction.atomic():
+        try:
+            destination=assert_available(space,parent,name)
+            prepare_parent(space,parent)
+            destination.mkdir(mode=0o700)
+        except (NameConflict,FileExistsError) as exc:
+            return error(str(exc),409)
+        except OSError as exc:
+            return error(f'Création impossible : {exc}')
         folder=DriveItem(owner=request.user,space=space,parent=parent,name=name,is_folder=True)
+        try:
             folder.full_clean();folder.save()
+        except Exception:
+            destination.rmdir()
+            raise
     return Response(item_info(folder,request.user),status=201)
 
 
@@ -98,22 +112,26 @@ def update_item(request,item_id):
     if not readable(item,request.user) or not writable(item,request.user):
         return error('Modification interdite.',403)
     data=request.data
-    if 'name' in data:
-        try:item.name=valid_name(data['name'])
-        except ValueError as ex:return error(str(ex))
-    if 'is_shared' in data:return error('Le partage global est désactivé : utilise les espaces et invitations.')
-    if 'parent' in data:
-        try:new_parent=target_parent(data['parent'],request.user,item.space)
-        except ValueError as ex:return error(str(ex))
-        except PermissionError as ex:return error(str(ex),403)
-        if new_parent and (new_parent.id==item.id or item.id in [n.id for n in chain(new_parent)]):
+    try:
+        new_name=valid_name(data['name']) if 'name' in data else item.name
+        new_parent=(target_parent(data['parent'],request.user,item.space)
+                    if 'parent' in data else item.parent)
+    except ValueError as exc:return error(str(exc))
+    except PermissionError as exc:return error(str(exc),403)
+    if 'is_shared' in data:
+        return error('Le partage global est désactivé : utilise les espaces et invitations.')
+    if new_parent and (new_parent.pk==item.pk or item.pk in [n.pk for n in chain(new_parent)]):
         return error('Déplacement impossible dans un sous-dossier de cet élément.')
-        item.parent=new_parent
-    try:item.full_clean()
-    except ValidationError as ex:return error(str(ex))
-    item.save()
+    if new_name==item.name and (new_parent.pk if new_parent else None)==item.parent_id:
         return Response(item_info(item,request.user))
 
+    try:
+        relocate_item(item,new_parent,new_name)
+    except (NameConflict,FileExistsError) as exc:
+        return error(str(exc),409)
+    except (OSError,ValueError,ValidationError) as exc:
+        return error(f'Déplacement impossible : {exc}',409)
+    return Response(item_info(item,request.user))
 
 @api_view(['POST'])
 def trash_item(request,item_id):
@@ -130,7 +148,10 @@ def restore_item(request,item_id):
     if not writable(item,request.user):return error('Accès refusé.',403)
     if not item.trashed_at:return error('Cet élément n’est pas dans la corbeille.')
     if item.parent and any(n.trashed_at for n in chain(item.parent)):
-        item.parent=None
+        try:
+            relocate_item(item,None,item.name)
+        except (NameConflict,FileExistsError,OSError,ValueError,ValidationError) as exc:
+            return error(f'Restauration impossible : {exc}',409)
     item.trashed_at=None;item.save()
     return Response(item_info(item,request.user))
 
@@ -141,6 +162,7 @@ def delete_item(request,item_id):
     if not writable(item,request.user):return error('Accès refusé.',403)
     if not item.trashed_at:return error('Déplace d’abord cet élément dans la corbeille.')
     files=descendant_files(item)
+    folder_rel=file_location(item.space,item.parent,item.name) if item.is_folder else None
     with transaction.atomic():
         item.delete()
         def remove_files():
@@ -148,5 +170,15 @@ def delete_item(request,item_id):
             for key in files:
                 path=(root/key).resolve()
                 if path.is_relative_to(root):path.unlink(missing_ok=True)
+            if folder_rel:
+                # Remove only empty folders. Untracked data is never deleted.
+                base=disk_path(folder_rel)
+                if base.is_dir():
+                    for candidate in sorted(base.rglob('*'),key=lambda p:len(p.parts),reverse=True):
+                        if candidate.is_dir() and not candidate.is_symlink():
+                            try:candidate.rmdir()
+                            except OSError:pass
+                    try:base.rmdir()
+                    except OSError:pass
         transaction.on_commit(remove_files)
     return Response(status=204)

backend/drive/views_transfers.py

@@ -1,6 +1,5 @@
 """Regular and resumable upload endpoints (disk-backed)."""
 import mimetypes
-import os
 import uuid
 from pathlib import Path
 from django.conf import settings
@@ -11,7 +10,8 @@ from rest_framework.parsers import MultiPartParser, FormParser
 from rest_framework.response import Response
 from .models import DriveItem, UploadSession
 from .services import error, item_info, target_parent, valid_name, readable, writable
-from .spaces import resolve_space, can_write_space, new_storage_location
+from .spaces import resolve_space, can_write_space
+from .storage_layout import file_location, disk_path, assert_available, prepare_parent, NameConflict
 from .quotas import QuotaExceeded, locked_quota_tree, assert_space_capacity
 
 
@@ -39,13 +39,13 @@ def upload(request):
                 for f in incoming:
                     name=valid_name(f.name)
                     key=str(uuid.uuid4())
-                    location=new_storage_location(space,key)
-                    dst=Path(settings.DRIVE_STORAGE_ROOT)/location
-                    dst.parent.mkdir(parents=True,exist_ok=True)
+                    location=file_location(space,parent,name)
+                    dst=assert_available(space,parent,name)
+                    prepare_parent(space,parent)
                     with open(dst,'xb') as out:
+                        saved.append(dst)  # Cleanup even when a stream fails halfway.
                         for block in f.chunks(chunk_size=2*1024*1024):
                             out.write(block)
-                    saved.append(dst)
                     mime=mimetypes.guess_type(name)[0] or 'application/octet-stream'
                     node=DriveItem.objects.create(owner=request.user,space=space,parent=parent,name=name,
                         storage_key=key,storage_location=location,size=f.size,mime_type=mime)
@@ -54,7 +54,7 @@ def upload(request):
         for entry in saved:
             path=entry[0] if isinstance(entry,tuple) else entry
             path.unlink(missing_ok=True)
-        return error(str(ex),413) if isinstance(ex,QuotaExceeded) else error(f'Import impossible : {ex}')
+        return error(str(ex),413) if isinstance(ex,QuotaExceeded) else error(str(ex),409) if isinstance(ex,(NameConflict,FileExistsError)) else error(f'Import impossible : {ex}')
     except Exception:
         for entry in saved:
             path=entry[0] if isinstance(entry,tuple) else entry
@@ -74,6 +74,9 @@ def upload_start(request):
     except (TypeError,ValueError) as ex:return error(str(ex))
     except PermissionError as ex:return error(str(ex),403)
     if size<0 or size>settings.DRIVE_MAX_FILE_SIZE:return error('Taille de fichier non autorisée.',413)
+    try:
+        assert_available(space,parent,name)
+    except NameConflict as ex: return error(str(ex),409)
     with transaction.atomic():
         with locked_quota_tree(space):
             if UploadSession.objects.filter(owner=request.user).count()>=20:
@@ -131,17 +134,31 @@ def upload_finish(request,upload_id):
         if not can_write_space(request.user,job.space) or (job.parent and (not readable(job.parent,request.user) or not writable(job.parent,request.user))):
             return error('Dossier de destination indisponible.',403)
         key=str(uuid.uuid4())
-        location=new_storage_location(job.space,key)
-        dst=Path(settings.DRIVE_STORAGE_ROOT)/location
-        dst.parent.mkdir(parents=True,exist_ok=True)
-        os.replace(src,dst)
+        location=file_location(job.space,job.parent,job.name)
+        created=False
+        try:
+            dst=assert_available(job.space,job.parent,job.name)
+            prepare_parent(job.space,job.parent)
+            # Exclusive creation: never overwrite a file already on disk.
+            # Copy, rather than rename: the temporary directory can be another volume.
+            with src.open('rb') as source, dst.open('xb') as output:
+                created=True
+                import shutil
+                shutil.copyfileobj(source,output,2*1024*1024)
+        except (NameConflict,FileExistsError) as exc:
+            if created:dst.unlink(missing_ok=True)
+            return error(str(exc),409)
+        except OSError as exc:
+            if created:dst.unlink(missing_ok=True)
+            return error(f'Finalisation impossible : {exc}')
         mime=mimetypes.guess_type(job.name)[0] or 'application/octet-stream'
         try:
             node=DriveItem.objects.create(owner=request.user,space=job.space,parent=job.parent,name=job.name,
                 size=job.total_size,mime_type=mime,storage_key=key,storage_location=location)
             job.delete()
+            transaction.on_commit(lambda: src.unlink(missing_ok=True))
         except Exception:
-            os.replace(dst,src)
+            dst.unlink(missing_ok=True)
             raise
         return Response(item_info(node,request.user),status=201)