add PUT method for raw file writes, open a/m/t for writes

main.go

@@ -3,7 +3,7 @@
 // Maps HTTP methods to 9P file operations:
 //
 //	GET    /path  - read file content or list directory entries
-//	PUT    /path  - write request body to file
+//	PUT    /path  - write request body to file (truncate)
 //	POST   /path  - create file (name = last path element)
 //	DELETE /path  - remove file
 //	HEAD   /path  - stat file (metadata in headers)
@@ -210,7 +210,7 @@ func handler(w http.ResponseWriter, r *http.Request) {
 	}
 	// Read-only paths — only GET and HEAD allowed.
 	switch first {
-	case "", "a", "m", "t", "sk":
+	case "", "sk":
 		if r.Method != http.MethodGet && r.Method != http.MethodHead {
 			writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "read-only"})
 			return
@@ -241,6 +241,8 @@ func handler(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		handleWrite(w, r, fsys, p)
+	case http.MethodPut:
+		handlePut(w, r, fsys, p)
 	case http.MethodDelete:
 		handleRemove(w, fsys, p)
 	case http.MethodPatch:
@@ -252,11 +254,12 @@ func handler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-var allowedMethods = "GET, HEAD, POST, DELETE, PATCH, OPTIONS"
+var allowedMethods = "GET, HEAD, PUT, POST, DELETE, PATCH, OPTIONS"
 
 var methodDescriptions = map[string]string{
 	"GET":     "read file content or list directory entries",
 	"HEAD":    "stat file (metadata in response headers)",
+	"PUT":     "write raw body to file (truncate)",
 	"POST":    "write to file or trigger action",
 	"DELETE":  "remove file or session",
 	"PATCH":   "rename via JSON {\"name\": \"newname\"}",
@@ -421,6 +424,26 @@ func handleStat(w http.ResponseWriter, fsys *client.Fsys, p string) {
 	w.Header().Set("Content-Type", "application/json")
 }
 
+func handlePut(w http.ResponseWriter, r *http.Request, fsys *client.Fsys, p string) {
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+		return
+	}
+	fid, err := fsys.Open(p, plan9.OWRITE|plan9.OTRUNC)
+	if err != nil {
+		writeJSON(w, http.StatusNotFound, map[string]string{"error": err.Error()})
+		return
+	}
+	n, err := fid.Write(body)
+	fid.Close()
+	if err != nil {
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]int{"bytes_written": n})
+}
+
 func handleWrite(w http.ResponseWriter, r *http.Request, fsys *client.Fsys, p string) {
 	var m map[string]any
 	if err := json.NewDecoder(r.Body).Decode(&m); err != nil {