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package main
import (
"errors"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"sort"
"strconv"
"time"
)
func mainHandler(ds DataStore, w http.ResponseWriter, r *http.Request) {
r.ParseForm()
if _, ok := r.Form["hs"]; ok {
protocol := r.FormValue("p")
if protocol != "1.2.1" && protocol != "1.2" {
fmt.Fprintf(w, "FAILED Protocol mismatch\n")
return
}
timestamp := r.FormValue("t")
ts, err := strconv.ParseInt(timestamp, 10, 0)
if err != nil {
fmt.Fprintf(w, "FAILED Invalid timestamp\n")
return
}
delta := time.Now().Unix() - ts
if delta > 30 || delta < -30 {
fmt.Fprintf(w, "BADTIME\n")
return
}
user := r.FormValue("u")
auth := r.FormValue("a")
password, err := ds.GetPassword(user)
if (md5hex(password+timestamp) != auth) || err != nil {
fmt.Fprintf(w, "BADAUTH\n")
return
}
client := r.FormValue("c")
s := NewSession(user, client, protocol)
ds.PutSession(s)
fmt.Fprint(w, "OK\n")
fmt.Fprintf(w, "%s\n", s.Key)
fmt.Fprint(w, "http://post.audioscrobbler.com:80/np\n")
fmt.Fprint(w, "http://post.audioscrobbler.com:80/scrobble\n")
} else {
fmt.Fprintf(w, "<html>This is an endpoint, see <a href=\"http://www.last.fm/api/submissions\">here</a></html>")
}
}
func parseValues(values url.Values) map[int]url.Values {
parts := make(map[int]url.Values)
var letter string
var idx int
for key, value := range values {
_, err := fmt.Sscanf(key, "%1s[%d]", &letter, &idx)
if err != nil {
continue
}
if _, ok := parts[idx]; !ok {
parts[idx] = make(url.Values)
}
parts[idx][letter] = value
}
return parts
}
func parsePart(values url.Values) (Scrobble, error) {
var scrobble Scrobble
scrobble.TrackName = values.Get("t")
scrobble.Artist = values.Get("a")
time, err := strconv.Atoi(values.Get("i"))
if err != nil {
return scrobble, errors.New("Could not parse timestamp")
}
scrobble.Time = time
scrobble.Album = values.Get("b")
scrobble.Mbid = values.Get("m")
tn, err := strconv.Atoi(values.Get("n"))
if err != nil {
return scrobble, errors.New("Could not parse track number")
}
scrobble.TrackNumber = tn
duration, err := strconv.Atoi(values.Get("l"))
if err != nil {
return scrobble, errors.New("Could not parse duration")
}
scrobble.Duration = duration
chosen := values.Get("o")
if chosen == "P" || chosen == "" {
scrobble.Chosen = true
}
return scrobble, nil
}
func parseScrobbles(values url.Values, session *Session) []Scrobble {
scrobbles := make([]Scrobble, 0, 1)
parts := parseValues(values)
keys := make([]int, len(parts))
i := 0
for key := range parts {
keys[i] = key
i++
}
sort.Ints(keys)
for _, key := range keys {
scrobble, err := parsePart(parts[key])
if err != nil {
continue
}
scrobble.Session = session.Key
scrobbles = append(scrobbles, scrobble)
}
return scrobbles
}
func scrobbleHandler(ds DataStore, w http.ResponseWriter, r *http.Request) {
if session, err := ds.GetSession(r.FormValue("s")); err != nil {
scrobbles := parseScrobbles(r.Form, session)
ds.PutScrobbles(scrobbles)
fmt.Fprintf(w, "OK\n")
} else {
fmt.Fprintf(w, "BADSESSION\n")
}
}
func nowPlayingHandler(ds DataStore, w http.ResponseWriter, r *http.Request) {
if _, err := ds.GetSession(r.FormValue("s")); err != nil {
fmt.Fprintln(w, "OK")
} else {
fmt.Fprintf(w, "BADSESSION\n")
}
}
type handler func(DataStore, http.ResponseWriter, *http.Request)
func wrap(ds DataStore, fn handler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
d, _ := httputil.DumpRequest(r, true)
fmt.Printf("--------------------------\n%s\n", d)
r.ParseForm()
fn(ds, w, r)
}
}
func main() {
store := NewSqlStore()
http.HandleFunc("/", wrap(store, handler(mainHandler)))
http.HandleFunc("/np", wrap(store, nowPlayingHandler))
http.HandleFunc("/scrobble", wrap(store, scrobbleHandler))
http.HandleFunc("/2.0/", wrap(store, ApiHandler))
http.ListenAndServe(":3001", nil)
}
|
