// bcryptAuthenticate uses the bcrypt authentication method to log in to the API, returning
// a session user and a pair of client/server errors
func bcryptAuthenticate(req *http.Request) (*data.User, *data.Session, error, error) {
// Username and password for authentication
var username string
var password string
// Check for empty authorization header
if req.Header.Get("Authorization") == "" {
// If no header, check for credentials via POST parameters
username = req.PostFormValue("username")
password = req.PostFormValue("password")
} else {
// Fetch credentials from HTTP Basic auth
tempUsername, tempPassword, err := basicCredentials(req.Header.Get("Authorization"))
if err != nil {
return nil, nil, err, nil
}
// Copy credentials
username = tempUsername
password = tempPassword
}
// Check if either credential is blank
if username == "" {
return nil, nil, ErrNoUsername, nil
} else if password == "" {
return nil, nil, ErrNoPassword, nil
}
// Attempt to load user by username
user := new(data.User)
user.Username = username
if err := user.Load(); err != nil {
// Check for invalid user
if err == sql.ErrNoRows {
return nil, nil, ErrInvalidUsername, nil
}
// Server error
return nil, nil, nil, err
}
// Compare input password with bcrypt password, checking for errors
err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password))
if err != nil && err == bcrypt.ErrMismatchedHashAndPassword {
// Mismatch password
return nil, nil, ErrInvalidPassword, nil
} else if err != nil && err != bcrypt.ErrMismatchedHashAndPassword {
// Return server error
return nil, nil, nil, err
}
// No errors, return session user, but no session because one does not exist yet
return user, nil, nil, nil
}
// tokenAuthenticate uses the token authentication method to log in to the API, returning
// a session user and a pair of client/server errors
func tokenAuthenticate(req *http.Request) (*data.User, *data.Session, error, error) {
// Token for authentication
var token string
// Check for empty authorization header
if req.Header.Get("Authorization") == "" {
// If no header, check for credentials via querystring parameters
token = req.URL.Query().Get("s")
} else {
// Fetch credentials from HTTP Basic auth
tempToken, _, err := basicCredentials(req.Header.Get("Authorization"))
if err != nil {
return nil, nil, err, nil
}
// Copy credentials
token = tempToken
}
// Check if token is blank
if token == "" {
return nil, nil, ErrNoToken, nil
}
// Attempt to load session by key
session := new(data.Session)
session.Key = token
if err := session.Load(); err != nil {
// Check for invalid user
if err == sql.ErrNoRows {
return nil, nil, ErrInvalidToken, nil
}
// Server error
return nil, nil, nil, err
}
// Attempt to load associated user by user ID from session
user := new(data.User)
user.ID = session.UserID
if err := user.Load(); err != nil {
// Server error
return nil, nil, nil, err
}
// Update session expiration date by 1 week
session.Expire = time.Now().Add(7 * 24 * time.Hour).Unix()
if err := session.Update(); err != nil {
return nil, nil, nil, err
}
// No errors, return session user and session
return user, session, nil, nil
}
// simpleAuthenticate uses the simple authentication method to log in to the API, returning
// a session user and a pair of client/server errors.
func simpleAuthenticate(req *http.Request) (*data.User, *data.Session, error, error) {
// Verify that SimpleAuth was triggered in debug mode
if !env.IsDebug() {
return nil, nil, nil, errors.New("not in debug mode")
}
// Username for authentication
var username string
// Check for empty authorization header
if req.Header.Get("Authorization") == "" {
// If no header, check for credentials via querystring parameters
query := req.URL.Query()
username = query.Get("u")
} else {
// Fetch credentials from HTTP Basic auth
tempUsername, _, err := basicCredentials(req.Header.Get("Authorization"))
if err != nil {
return nil, nil, err, nil
}
// Copy credentials
username = tempUsername
}
// Check if username is blank
if username == "" {
return nil, nil, ErrNoUsername, nil
}
// Attempt to load user by username
user := new(data.User)
user.Username = username
if err := user.Load(); err != nil {
// Check for invalid user
if err == sql.ErrNoRows {
return nil, nil, errors.New("invalid username"), nil
}
// Server error
return nil, nil, nil, err
}
// No errors, return session user, but no session because one does not exist yet
return user, nil, nil, nil
}
// PostLastFM allows access to the Last.fm API, enabling wavepipe to set a user's currently-playing
// track, as well as to enable scrobbling.
func PostLastFM(w http.ResponseWriter, r *http.Request) {
// Retrieve render
ren := context.Get(r, CtxRender).(*render.Render)
// Attempt to retrieve user from context
user := new(data.User)
if tempUser := context.Get(r, CtxUser); tempUser != nil {
user = tempUser.(*data.User)
} else {
// No user stored in context
log.Println("api: no user stored in request context!")
ren.JSON(w, 500, serverErr)
return
}
// Output struct for Last.fm response
out := LastFMResponse{}
// Check API version
if version, ok := mux.Vars(r)["version"]; ok {
// Check if this API call is supported in the advertised version
if !apiVersionSet.Has(version) {
ren.JSON(w, 400, errRes(400, "unsupported API version: "+version))
return
}
}
// Do not allow guests and below to use Last.fm functionality
if user.RoleID < data.RoleUser {
ren.JSON(w, 403, permissionErr)
return
}
// Check API action
action, ok := mux.Vars(r)["action"]
if !ok {
ren.JSON(w, 400, errRes(400, "no string action provided"))
return
}
// Check for valid action
if !set.New(lfmLogin, lfmNowPlaying, lfmScrobble).Has(action) {
ren.JSON(w, 400, errRes(400, "invalid string action provided"))
return
}
// Instantiate Last.fm package
lfm := lastfm.New(lfmAPIKey, lfmAPISecret)
// Authenticate to the Last.fm API
if action == lfmLogin {
// Retrieve username from POST body
username := r.PostFormValue("username")
if username == "" {
ren.JSON(w, 400, errRes(400, lfmLogin+": no username provided"))
return
}
// Retrieve password from POST body
password := r.PostFormValue("password")
if password == "" {
ren.JSON(w, 400, errRes(400, lfmLogin+": no password provided"))
return
}
// Send a login request to Last.fm
if err := lfm.Login(username, password); err != nil {
ren.JSON(w, 401, errRes(401, lfmLogin+": last.fm authentication failed"))
return
}
// Retrieve the API token for this user with wavepipe
token, err := lfm.GetToken()
if err != nil {
log.Println(err)
ren.JSON(w, 500, serverErr)
return
}
// Store the user's Last.fm token in the database
user.LastFMToken = token
if err := user.Update(); err != nil {
log.Println(err)
ren.JSON(w, 500, serverErr)
return
}
// Return the token authorization URL for the user
out.URL = lfm.GetAuthTokenUrl(token)
log.Println(lfmLogin, ": generated new token for user:"******"" {
ren.JSON(w, 401, errRes(401, action+": user must authenticate to last.fm"))
return
}
// Send a login request to Last.fm using token
if err := lfm.LoginWithToken(user.LastFMToken); err != nil {
// Check if token has not been authorized
if strings.HasPrefix(err.Error(), "LastfmError[14]") {
// Generate error output, but add the token authorization URL
out.URL = lfm.GetAuthTokenUrl(user.LastFMToken)
ren.JSON(w, 401, errRes(401, action+": last.fm token not yet authorized"))
return
}
// All other failures
ren.JSON(w, 401, errRes(401, action+": last.fm authentication failed"))
return
}
// Check for an ID parameter
pID, ok := mux.Vars(r)["id"]
if !ok {
ren.JSON(w, 400, errRes(400, action+": no integer song ID provided"))
return
}
// Verify valid integer ID
id, err := strconv.Atoi(pID)
if err != nil {
ren.JSON(w, 400, errRes(400, action+": invalid integer song ID"))
return
}
// Load the song by ID
song := &data.Song{ID: id}
if err := song.Load(); err != nil {
// Check for invalid ID
if err == sql.ErrNoRows {
ren.JSON(w, 404, errRes(404, action+": song ID not found"))
return
}
// All other errors
log.Println(err)
ren.JSON(w, 500, serverErr)
return
}
// Log the current action
log.Printf("%s : %s : [#%05d] %s - %s", action, user.Username, song.ID, song.Artist, song.Title)
// Create the track entity required by Last.fm from the song
track := lastfm.P{
"artist": song.Artist,
"album": song.Album,
"track": song.Title,
"timestamp": time.Now().Unix(),
}
// Check for optional timestamp parameter, which could be useful for sending scrobbles at
// past times, etc
if pTS := r.URL.Query().Get("timestamp"); pTS != "" {
// Verify valid integer timestamp
ts, err := strconv.Atoi(pTS)
if err != nil || ts < 0 {
ren.JSON(w, 400, errRes(400, action+": invalid integer timestamp"))
return
}
// Override previously set timestamp with this one
track["timestamp"] = ts
}
// Send a now playing request to the Last.fm API
if action == lfmNowPlaying {
// Perform the action
if _, err := lfm.Track.UpdateNowPlaying(track); err != nil {
log.Println(err)
ren.JSON(w, 500, serverErr)
return
}
// HTTP 200 OK with JSON
out.Error = nil
ren.JSON(w, 200, out)
return
}
// Send a scrobble request to the Last.fm API
if action == lfmScrobble {
// Perform the action
if _, err := lfm.Track.Scrobble(track); err != nil {
log.Println(err)
ren.JSON(w, 500, serverErr)
return
}
// HTTP 200 OK with JSON
out.Error = nil
ren.JSON(w, 200, out)
return
}
// Invalid action, meaning programmer error, HTTP 500
panic("no such Last.fm action: " + action)
}
// subsonicAuthenticate uses the Subsonic authentication method to log in to the API, returning
// only a pair of client/server errors
func subsonicAuthenticate(req *http.Request) (*data.User, *data.Session, error, error) {
// Check for required credentials via querystring
query := req.URL.Query()
username := query.Get("u")
password := query.Get("p")
// Check if username or password is blank
if username == "" || password == "" {
return nil, nil, subsonic.ErrBadCredentials, nil
}
// Check for Subsonic version
version := query.Get("v")
if version == "" {
return nil, nil, subsonic.ErrMissingParameter, nil
}
// TODO: reevaluate this strategy in the future, but for now, we will use a user's wavepipe session
// TODO: key as their Subsonic password. This will mean that the username and session key are passed on
// TODO: every request, but also means that no more database schema must be added for Subsonic authentication.
// Check for "enc:" prefix, specifying a hex-encoded password
if strings.HasPrefix(password, "enc:") {
// Decode hex string
out, err := hex.DecodeString(password[4:])
if err != nil {
return nil, nil, nil, err
}
password = string(out)
}
// Attempt to load session by key passed via Subsonic password parameter
session := new(data.Session)
session.Key = password
if err := session.Load(); err != nil {
// Check for invalid user
if err == sql.ErrNoRows {
return nil, nil, subsonic.ErrBadCredentials, nil
}
// Server error
return nil, nil, nil, err
}
// Attempt to load associated user by username from Subsonic username parameter
user := new(data.User)
user.Username = username
if err := user.Load(); err != nil {
// Server error
return nil, nil, nil, err
}
// Update session expiration date by 1 week
session.Expire = time.Now().Add(7 * 24 * time.Hour).Unix()
if err := session.Update(); err != nil {
return nil, nil, nil, err
}
// No errors, return no user or session because the emulated Subsonic API is read-only
return nil, nil, nil, nil
}