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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net/http"
)
var (
listenAddr = flag.String("http", ":8080", "http listen address")
dataFile = flag.String("file", "store.json", "data store file name")
hostname = flag.String("host", "localhost:8080", "http host name")
)
var store *URLStore
func main() {
flag.Parse()
store = NewURLStore(*dataFile)
http.HandleFunc("/", Redirect)
http.HandleFunc("/add", Add)
http.ListenAndServe(*listenAddr, nil)
}
func Redirect(w http.ResponseWriter, r *http.Request) {
key := r.URL.Path[1:]
url := store.Get(key)
if url == "" {
http.NotFound(w, r)
return
}
http.Redirect(w, r, url, http.StatusFound)
}
func Add(w http.ResponseWriter, r *http.Request) {
url := r.FormValue("url")
if url == "" {
fmt.Fprint(w, AddForm)
return
}
key := store.Put(url)
fmt.Fprintf(w, "http://%s/%s", *hostname, key)
}
const AddForm = `
<form method="POST" action="/add">
URL: <input type="text" name="url">
<input type="submit" value="Add">
</form>
`