// Login handles login responses from the Spotify API
func Login(globalContext *context.GlobalContext) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
csrfJSON, err := crypto.Decrypt(r.URL.Query().Get("state"))
if err != nil {
panic(err)
}
csrf := make(map[string]string)
err = json.Unmarshal([]byte(csrfJSON), &csrf)
if err != nil {
panic(err)
}
if ip, ok := csrf["IP"]; !ok || ip != util.StripPort(r.RemoteAddr) {
panic(errors.New("CSRF mismatch"))
}
if a, ok := csrf["User-Agent"]; !ok || a != r.Header.Get("User-Agent") {
panic(errors.New("CSRF mismatch"))
}
data := map[string]interface{}{
"error": r.URL.Query().Get("error"),
}
if r.URL.Query().Get("error") == "" {
redirectURI, err := loginURI(globalContext, r.Host)
if err != nil {
panic(err)
}
tokens, err := spotify.GetAuthTokens(
globalContext.Spotify.ClientID,
globalContext.Spotify.ClientSecret,
r.URL.Query().Get("code"),
redirectURI,
)
data["expires_in"] = tokens.ExpiresIn
jsonToken, err := json.Marshal(tokens)
if err != nil {
panic(err)
}
token, err := crypto.Encrypt(string(jsonToken))
if err != nil {
panic(err)
}
data["token"] = token
}
err = globalContext.Templates.Login.Execute(w, data)
if err != nil {
panic(err)
}
}
}
// Index renders the homepage.
func Index(globalContext *context.GlobalContext) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
csrfData := map[string]string{
"User-Agent": r.Header.Get("User-Agent"),
"IP": util.StripPort(r.RemoteAddr),
}
csrfPlaintext, err := json.Marshal(csrfData)
if err != nil {
panic(err)
}
csrfToken, err := crypto.Encrypt(string(csrfPlaintext))
loginCompletionURI, err := loginURI(globalContext, r.Host)
if err != nil {
panic(err)
}
loginURI, err := spotify.GetLoginURI(
globalContext.Spotify.ClientID,
csrfToken,
loginCompletionURI,
)
if err != nil {
panic(err)
}
refreshURI, err := globalContext.Router.Get("refresh").URL()
if err != nil {
panic(err)
}
playlistsURI, err := globalContext.Router.Get("playlists").URL()
if err != nil {
panic(err)
}
submitURI, err := globalContext.Router.Get("submit").URL()
if err != nil {
panic(err)
}
err = globalContext.Templates.Index.Execute(
w,
map[string]interface{}{
"loginURI": loginURI.String(),
"refreshURI": refreshURI.String(),
"playlistsURI": playlistsURI.String(),
"submitURI": submitURI.String(),
},
)
if err != nil {
panic(err)
}
}
}