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spa.go
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spa.go
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// ----------------------------------------------------------------------------
// Copyright (c) Ben Coleman, 2020-2023
// Licensed under the MIT License.
//
// Static content and SPA handler
// ----------------------------------------------------------------------------
package static
import (
"net/http"
"os"
"path/filepath"
)
// spaHandler implements the http.Handler interface, so we can use it
// to respond to HTTP requests. The path to the static directory and
// path to the index file within that static directory are used to
// serve the SPA in the given static directory.
type SpaHandler struct {
StaticPath string
IndexFile string
}
// ServeHTTP inspects the URL path to locate a file within the static dir
// on the SPA handler. If a file is found, it will be served. If not, the
// file located at the index path on the SPA handler will be served. This
// is suitable behaviour for serving an SPA (single page application).
func (h SpaHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Get the absolute path to prevent directory traversal
path, err := filepath.Abs(r.URL.Path)
if err != nil {
// If we failed to get the absolute path respond with a 400 bad request and stop
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// Prepend the path with the path to the static directory
path = filepath.Join(h.StaticPath, path)
// Check whether a file exists at the given path
_, err = os.Stat(path)
if os.IsNotExist(err) {
// File does not exist, serve our index file
http.ServeFile(w, r, filepath.Join(h.StaticPath, h.IndexFile))
return
} else if err != nil {
// If we got an error at this point, we are so screwed
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Otherwise, use http.FileServer to serve the static dir
http.FileServer(http.Dir(h.StaticPath)).ServeHTTP(w, r)
}