implement /random redirect

WikiServer.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"html/template"
+	"math/rand"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -95,6 +96,17 @@ func (this *WikiServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			this.serveRedirect(w, this.opts.ExpectBaseURL+`view/`+url.QueryEscape(this.opts.DefaultPage))
 			return
 
+		} else if remainingPath == "random" {
+			titles, err := this.db.ListTitles()
+			if err != nil {
+				this.serveInternalError(w, r, err)
+				return
+			}
+
+			chosenArticle := titles[rand.Intn(len(titles))]
+			this.serveRedirect(w, this.opts.ExpectBaseURL+`view/`+url.QueryEscape(chosenArticle))
+			return
+
 		} else if strings.HasPrefix(remainingPath, "view/") {
 			articleTitle, err := url.QueryUnescape(remainingPath[len("view/"):])
 			if err != nil {