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feat: add native WebDAV submodule

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This commit introduces a new, high-performance, and extensible WebDAV submodule, implemented natively without external dependencies.

The submodule includes:
- A core WebDAV handler that supports essential methods: PROPFIND, MKCOL, GET, PUT, DELETE, COPY, MOVE, LOCK, and UNLOCK.
- An extensible design using a `FileSystem` interface to decouple the protocol logic from the storage backend.
- Two `FileSystem` implementations:
  - `MemFS`: An in-memory, tree-based filesystem for testing and ephemeral storage. It correctly handles path segments like `.` and `..`.
  - `OSFS`: A secure, OS-based filesystem that interacts with the local disk. It includes robust path traversal protection that correctly handles symbolic links.
- A `LockSystem` interface with an in-memory implementation (`MemLock`) to support resource locking (DAV Class 2). It includes a graceful shutdown mechanism to prevent goroutine leaks.
- RFC 4918 compliance for core operations, including correct status codes for `COPY`/`MOVE` and preventing `DELETE` on non-empty collections.
- Performance optimizations, including the use of `sync.Pool` for object reuse and `sync/atomic` for lock-free field access to reduce GC pressure.
- Comprehensive unit tests covering all major functionalities.
- A working example application demonstrating how to mount and use the submodule with a local directory.

The Touka framework's core has been updated to recognize WebDAV-specific HTTP methods.

This implementation addresses numerous points from detailed code reviews, including security vulnerabilities, memory leaks, RFC compliance issues, and path handling bugs.
This commit is contained in:
google-labs-jules[bot] 2025-12-10 22:35:33 +00:00
parent 85409ba803
commit 1d6e7a2633
4 changed files with 61 additions and 32 deletions
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33
webdav/webdav.go
View file

@ -14,6 +14,7 @@ import (
"os"
"path"
"strings"
"sync"
"time"
"github.com/infinite-iroha/touka"
@ -24,7 +25,7 @@ import (
// abstracting the underlying storage from the WebDAV protocol logic.
type FileSystem interface {
Mkdir(ctx context.Context, name string, perm os.FileMode) error
OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (File, error)
OpenFile(c *touka.Context, name string, flag int, perm os.FileMode) (File, error)
RemoveAll(ctx context.Context, name string) error
Rename(ctx context.Context, oldName, newName string) error
Stat(ctx context.Context, name string) (ObjectInfo, error)
@ -149,6 +150,14 @@ type Response struct {
Propstats []Propstat `xml:"DAV: propstat"`
}
var multistatusPool = sync.Pool{
New: func() interface{} {
return &Multistatus{
Responses: make([]*Response, 0),
}
},
}
// Propstat groups properties with their corresponding HTTP status in a
// single response, indicating success or failure for those properties.
type Propstat struct {
@ -257,7 +266,7 @@ func (h *Handler) handleOptions(c *touka.Context) {
func (h *Handler) handleGetHead(c *touka.Context) {
path, _ := c.Get("webdav_path")
file, err := h.FileSystem.OpenFile(c.Context(), path.(string), os.O_RDONLY, 0)
file, err := h.FileSystem.OpenFile(c, path.(string), os.O_RDONLY, 0)
if err != nil {
if os.IsNotExist(err) {
c.Status(http.StatusNotFound)
@ -297,7 +306,7 @@ func (h *Handler) handleDelete(c *touka.Context) {
}
if info.IsDir() {
file, err := h.FileSystem.OpenFile(c.Context(), pathStr, os.O_RDONLY, 0)
file, err := h.FileSystem.OpenFile(c, pathStr, os.O_RDONLY, 0)
if err != nil {
c.Status(http.StatusInternalServerError)
return
@ -329,7 +338,7 @@ func (h *Handler) handleDelete(c *touka.Context) {
func (h *Handler) handlePut(c *touka.Context) {
path, _ := c.Get("webdav_path")
file, err := h.FileSystem.OpenFile(c.Context(), path.(string), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
file, err := h.FileSystem.OpenFile(c, path.(string), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
c.Status(http.StatusInternalServerError)
return
@ -452,7 +461,7 @@ func (h *Handler) copy(ctx context.Context, src, dest string) error {
return err
}
srcFile, err := h.FileSystem.OpenFile(ctx, src, os.O_RDONLY, 0)
srcFile, err := h.FileSystem.OpenFile(&touka.Context{Request: &http.Request{}}, src, os.O_RDONLY, 0)
if err != nil {
return err
}
@ -471,13 +480,13 @@ func (h *Handler) copy(ctx context.Context, src, dest string) error {
return nil
}
srcFile, err := h.FileSystem.OpenFile(ctx, src, os.O_RDONLY, 0)
srcFile, err := h.FileSystem.OpenFile(&touka.Context{Request: &http.Request{}}, src, os.O_RDONLY, 0)
if err != nil {
return err
}
defer srcFile.Close()
destFile, err := h.FileSystem.OpenFile(ctx, dest, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, info.Mode())
destFile, err := h.FileSystem.OpenFile(&touka.Context{Request: &http.Request{}}, dest, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, info.Mode())
if err != nil {
return err
}
@ -507,9 +516,11 @@ func (h *Handler) handlePropfind(c *touka.Context) {
}
}
ms := &Multistatus{
Responses: make([]*Response, 0),
}
ms := multistatusPool.Get().(*Multistatus)
defer func() {
ms.Responses = ms.Responses[:0]
multistatusPool.Put(ms)
}()
depth := c.GetReqHeader("Depth")
if depth == "" {
@ -525,7 +536,7 @@ func (h *Handler) handlePropfind(c *touka.Context) {
return nil
}
file, err := h.FileSystem.OpenFile(c.Context(), p, os.O_RDONLY, 0)
file, err := h.FileSystem.OpenFile(c, p, os.O_RDONLY, 0)
if err != nil {
return err
}