package webui
import (
"net/http"
"os"
"path/filepath"
"strings"
"github.com/go-chi/chi/v5"
"ds2api/internal/config"
)
const welcomeHTML = `
DS2API
DS2API
DeepSeek to OpenAI & Claude Compatible API
`
type Handler struct {
StaticDir string
}
func NewHandler() *Handler {
return &Handler{StaticDir: resolveStaticAdminDir(config.StaticAdminDir())}
}
func RegisterRoutes(r chi.Router, h *Handler) {
r.Get("/", h.index)
r.Get("/admin", h.admin)
}
func (h *Handler) HandleAdminFallback(w http.ResponseWriter, r *http.Request) bool {
if r.Method != http.MethodGet {
return false
}
if !strings.HasPrefix(r.URL.Path, "/admin/") {
return false
}
h.admin(w, r)
return true
}
func (h *Handler) index(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte(welcomeHTML))
}
func (h *Handler) admin(w http.ResponseWriter, r *http.Request) {
staticDir := resolveStaticAdminDir(h.StaticDir)
if fi, err := os.Stat(staticDir); err == nil && fi.IsDir() {
h.serveFromDisk(w, r, staticDir)
return
}
http.Error(w, "WebUI not built. Run `cd webui && npm run build` first.", http.StatusNotFound)
}
// staticContentTypes pins the Content-Type of common WebUI assets so we do not
// rely on mime.TypeByExtension, which on Windows consults the registry and can
// return the wrong type (e.g. application/xml for .css) when third-party
// software has overwritten HKEY_CLASSES_ROOT entries. Browsers strictly enforce
// stylesheet/script MIME types and will refuse to apply a misidentified asset,
// breaking the /admin page on affected machines.
var staticContentTypes = map[string]string{
".css": "text/css; charset=utf-8",
".js": "text/javascript; charset=utf-8",
".mjs": "text/javascript; charset=utf-8",
".html": "text/html; charset=utf-8",
".htm": "text/html; charset=utf-8",
".json": "application/json; charset=utf-8",
".map": "application/json; charset=utf-8",
".svg": "image/svg+xml",
".png": "image/png",
".jpg": "image/jpeg",
".jpeg": "image/jpeg",
".gif": "image/gif",
".webp": "image/webp",
".ico": "image/x-icon",
".woff": "font/woff",
".woff2": "font/woff2",
".ttf": "font/ttf",
".otf": "font/otf",
".txt": "text/plain; charset=utf-8",
".wasm": "application/wasm",
}
// setStaticContentType pins the response Content-Type by file extension so that
// http.ServeFile does not fall back to mime.TypeByExtension (which on Windows
// reads the registry and may return an incorrect type).
func setStaticContentType(w http.ResponseWriter, fullPath string) {
ext := strings.ToLower(filepath.Ext(fullPath))
if ct, ok := staticContentTypes[ext]; ok {
w.Header().Set("Content-Type", ct)
}
}
func (h *Handler) serveFromDisk(w http.ResponseWriter, r *http.Request, staticDir string) {
path := strings.TrimPrefix(r.URL.Path, "/admin")
path = strings.TrimPrefix(path, "/")
if path != "" && strings.Contains(path, ".") {
full := filepath.Join(staticDir, filepath.Clean(path))
if !strings.HasPrefix(full, staticDir) {
http.NotFound(w, r)
return
}
if _, err := os.Stat(full); err == nil {
if strings.HasPrefix(path, "assets/") {
w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
} else {
w.Header().Set("Cache-Control", "no-store, must-revalidate")
}
setStaticContentType(w, full)
http.ServeFile(w, r, full)
return
}
http.NotFound(w, r)
return
}
index := filepath.Join(staticDir, "index.html")
if _, err := os.Stat(index); err != nil {
http.Error(w, "index.html not found", http.StatusNotFound)
return
}
w.Header().Set("Cache-Control", "no-store, must-revalidate")
setStaticContentType(w, index)
http.ServeFile(w, r, index)
}
func resolveStaticAdminDir(preferred string) string {
if strings.TrimSpace(os.Getenv("DS2API_STATIC_ADMIN_DIR")) != "" {
return filepath.Clean(preferred)
}
candidates := []string{preferred}
if wd, err := os.Getwd(); err == nil {
candidates = append(candidates, filepath.Join(wd, "static/admin"))
}
if exe, err := os.Executable(); err == nil {
exeDir := filepath.Dir(exe)
candidates = append(candidates,
filepath.Join(exeDir, "static/admin"),
filepath.Join(filepath.Dir(exeDir), "static/admin"),
)
}
// Common serverless locations.
candidates = append(candidates, "/var/task/static/admin", "/var/task/user/static/admin")
seen := map[string]struct{}{}
for _, c := range candidates {
c = filepath.Clean(strings.TrimSpace(c))
if c == "" {
continue
}
if _, ok := seen[c]; ok {
continue
}
seen[c] = struct{}{}
if fi, err := os.Stat(c); err == nil && fi.IsDir() {
return c
}
}
return filepath.Clean(preferred)
}