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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)
}
}
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