//
// Middleware called every call that requires user Authentication
// It injects the Auth object in handlers that require it to work
// Return the user in this context or an anonymous user and an error
// Should be used .Logged to identify if it's an anonymous user
// and use .GetUser to get this context user or the anonymous user the error object
//
func AuthMiddleware(c martini.Context, db DB, r render.Render, req *http.Request) {
anonymous := &User{
UserId: "anonymous",
UserName: "******",
PicId: "default",
FullName: "Usuario Anonimo",
LikeCount: 0,
Creation: time.Now(),
LastUpdate: time.Now(),
Deleted: false,
Admin: false,
}
// Try to get the credentials from Authorization header or credentials cookie
credentials := req.Header.Get("Authorization")
if credentials == "" {
cookie, err := req.Cookie("credentials")
if err == nil {
credentials = cookie.Value
}
}
if credentials == "" {
err := errors.New("Voce nao apresentou credenciais de autorizacao")
userAuth := &UserAuth{anonymous, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Handler aborted
// If the nex handler aborted, by an empty return
// So he can't go on without user, let's alert user
AccessDeniedHandler(r, req, err)
}
return
}
// Len of our 41 (20:20) char encoded in base64 is 56
// (C++) long base64EncodedSize = 4 * (int)Math.Ceiling(originalSizeInBytes / 3.0);
if len(credentials) != 56 {
err := errors.New("Credenciais de authorizacao apresentadas sao invalidas.")
userAuth := &UserAuth{anonymous, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Handler aborted
AccessDeniedHandler(r, req, err)
}
return
}
token, err := decodeAuth(credentials)
if err != nil {
userAuth := &UserAuth{anonymous, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Handler aborted
AccessDeniedHandler(r, req, err)
}
return
}
obj, err := db.Get(Token{}, token.TokenId, token.UserId)
if err != nil {
userAuth := &UserAuth{anonymous, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Handler aborted
AccessDeniedHandler(r, req, err)
}
return
}
if obj == nil {
// This tokenid was not found
err = errors.New("Credenciais fornecidas nao foram encontradas")
userAuth := &UserAuth{anonymous, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Handler aborted
AccessDeniedHandler(r, req, err)
}
return
}
token = obj.(*Token)
obj, err = db.Get(User{}, token.UserId)
if err != nil {
userAuth := &UserAuth{anonymous, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Handler aborted
AccessDeniedHandler(r, req, err)
}
return
}
user := obj.(*User)
userAuth := &UserAuth{user: user, err: nil}
// Here the next handler has got the user
c.MapTo(userAuth, (*Auth)(nil))
}
func AuthMiddleware(c martini.Context, db DB, r render.Render, req *http.Request) {
header := req.Header.Get("Authorization")
if header == "" {
err := errors.New("Voce nao apresentou credenciais de autorizacao")
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() {
// If the nex handler aborted, empty return
// So he can't go on without user, let's alert user
AccessDeniedHandler(r, req, err)
}
return
}
// Len of our 41 (20:20) char encoded in base64 is 56
// (C++) long base64EncodedSize = 4 * (int)Math.Ceiling(originalSizeInBytes / 3.0);
if len(header) < 56 {
err := errors.New("Credenciais de authorizacao apresentadas sao invalidas.")
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
auth, err := decodeAuth(header)
if err != nil {
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
i := strings.Index(auth, ":")
if i == -1 {
err = errors.New("Credenciais de authorizacao estao corrompidas")
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
tokenid := auth[:i]
userid := auth[i+1:]
obj, err := db.Get(Token{}, tokenid)
if err != nil {
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
if obj == nil {
// This tokenid was not found
err = errors.New("Credenciais fornecidas nao foram encontradas")
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
token := obj.(*Token)
if token.UserId != userid {
err = errors.New("Usuario nao identificado pelas credenciais fornecidas")
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
obj, err = db.Get(User{}, userid)
if err != nil {
userAuth := &UserAuth{nil, err}
c.MapTo(userAuth, (*Auth)(nil))
c.Next() // Call the next handler
if !c.Written() { // Response the user
AccessDeniedHandler(r, req, err)
}
return
}
user := obj.(*User)
userAuth := &UserAuth{user: user, err: nil}
// Here the next handler has got the user
c.MapTo(userAuth, (*Auth)(nil))
}