func()

in dash.go [44:103]
47 lines of code
13 McCabe index (conditional complexity)

func (d *Dash) Handler(prefix string) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {

		// create a timeout on the proxy request
		ctx, cancel := context.WithTimeout(r.Context(), d.Config.ProxyTimeout)
		defer cancel()

		// build the object name
		objName := strings.TrimPrefix(r.URL.Path, prefix)
		if objName == "" || strings.HasSuffix(objName, "/") {
			objName += "index.html"
		}
		if d.Prefix != "" {
			objName = d.Prefix + "/" + objName
		}

		// get the object
		gcsResp, err := d.getObject(ctx, r.Header, r.Method, objName)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if gcsResp.StatusCode == http.StatusNotFound {
			if d.SPA && objName != (d.Prefix+"/index.html") {
				objName = "index.html"
				if d.Prefix != "" {
					objName = d.Prefix + "/" + objName
				}
				gcsResp.Body.Close()

				gcsResp, err = d.getObject(ctx, r.Header, r.Method, objName)
				if err != nil {
					http.Error(w, err.Error(), http.StatusInternalServerError)
					return
				}
			}
		}

		defer gcsResp.Body.Close()

		// add dashboard name, bucket, and object to log
		hlog.FromRequest(r).Info().
			Str("dashboard", d.Name).
			Str("bucket", d.Bucket).
			Str("object", objName).
			Msg("")

		// copy GCS response headers and body to our response
		for name, values := range gcsResp.Header {
			for _, value := range values {
				w.Header().Add(name, value)
			}
		}
		w.WriteHeader(gcsResp.StatusCode)
		if _, err = io.Copy(w, gcsResp.Body); err != nil {
			http.Error(w, "500 Internal Server Error", http.StatusInternalServerError)
		}
	}
}