1 files changed, 61 insertions, 0 deletions
diff --git a/server.go b/server.go
new file mode 100644
index 0000000..df98893
--- /dev/null
+++ b/server.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"database/sql"
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+)
+
+func newMux(db *sql.DB) http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/robots.txt", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain")
+		fmt.Fprint(w, "User-agent: *\nDisallow: /\n")
+	})
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		path := strings.TrimPrefix(r.URL.Path, "/")
+		if path == "" {
+			http.Error(w, "not found", http.StatusNotFound)
+			return
+		}
+		if strings.Contains(path, "/") {
+			http.Error(w, "not found", http.StatusNotFound)
+			return
+		}
+		id, err := decodeID(path)
+		if err != nil {
+			http.Error(w, "not found", http.StatusNotFound)
+			return
+		}
+		url, err := getURL(db, id)
+		if err != nil {
+			http.Error(w, "not found", http.StatusNotFound)
+			return
+		}
+		http.Redirect(w, r, url, http.StatusMovedPermanently)
+	})
+	return mux
+}
+
+func cmdServe(args []string) {
+	fs := flag.NewFlagSet("serve", flag.ExitOnError)
+	addr := fs.String("addr", ":8080", "listen address")
+	dbPath := fs.String("db", "nilink.db", "database path")
+	fs.Parse(args)
+
+	db, err := openDB(*dbPath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+	defer db.Close()
+
+	fmt.Fprintf(os.Stderr, "listening on %s\n", *addr)
+	if err := http.ListenAndServe(*addr, newMux(db)); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}