open urls directly when searching for them

main.go

@@ -7,6 +7,8 @@ import (
 	"html/template"
 	"io"
 	"net/http"
+	"net/url"
+	"strings"
 
 	_ "embed"
 )
@@ -91,6 +93,22 @@ func icons(w http.ResponseWriter, r *http.Request) {
 func search(w http.ResponseWriter, r *http.Request) {
 	r.ParseForm()
 	query := r.Form.Get("query")
-	w.Header().Add("Location", fmt.Sprintf("https://duckduckgo.com/?q=%s", query))
-	w.WriteHeader(http.StatusMovedPermanently)
+
+	if uri, err := ParseURI(query); err == nil {
+		// url
+		w.Header().Add("Location", uri.String())
+		w.WriteHeader(http.StatusMovedPermanently)
+	} else {
+		// search string
+		w.Header().Add("Location", fmt.Sprintf("https://duckduckgo.com/?q=%s", query))
+		w.WriteHeader(http.StatusMovedPermanently)
+	}
+}
+
+func ParseURI(uri string) (*url.URL, error) {
+	if !strings.HasPrefix(uri, "http://") && !strings.HasPrefix(uri, "https://") {
+		uri = "https://" + uri
+	}
+	ret, err := url.ParseRequestURI(uri)
+	return ret, err
 }