func SetUser(c *gin.Context) {
var user *model.User
// authenticates the user via an authentication cookie
// or an auth token.
t, err := token.ParseRequest(c.Request, func(t *token.Token) (string, error) {
var err error
user, err = store.GetUserLogin(c, t.Text)
return user.Secret, err
})
if err == nil {
c.Set("user", user)
// if this is a session token (ie not the API token)
// this means the user is accessing with a web browser,
// so we should implement CSRF protection measures.
if t.Kind == token.SessToken {
err = token.CheckCsrf(c.Request, func(t *token.Token) (string, error) {
return user.Secret, nil
})
// if csrf token validation fails, exit immediately
// with a not authorized error.
if err != nil {
c.AbortWithStatus(http.StatusUnauthorized)
return
}
}
}
c.Next()
}
// LoginToken authenticates a user with their GitHub token and
// returns an LGTM API token in the response.
func LoginToken(c *gin.Context) {
access := c.Query("access_token")
login, err := remote.GetUserToken(c, access)
if err != nil {
c.String(403, "Unable to authenticate user. %s", err)
return
}
user, err := store.GetUserLogin(c, login)
if err != nil {
c.String(404, "Unable to authenticate user %s. Not registered.", user.Login)
return
}
exp := time.Now().Add(time.Hour * 72).Unix()
token := token.New(token.UserToken, user.Login)
tokenstr, err := token.SignExpires(user.Secret, exp)
if err != nil {
c.AbortWithError(http.StatusInternalServerError, err)
return
}
c.IndentedJSON(http.StatusOK, &tokenPayload{
Access: tokenstr,
Expires: exp - time.Now().Unix(),
})
}
// Login attempts to authorize a user via GitHub oauth2. If the user does not
// yet exist, and new account is created. Upon successful login the user is
// redirected to the main screen.
func Login(c *gin.Context) {
// render the error page if the login fails. Without this block
// we would encounter an infinite number of redirects.
if err := c.Query("error"); len(err) != 0 {
c.HTML(500, "error.html", gin.H{"error": err})
return
}
// when dealing with redirects we may need
// to adjust the content type. I cannot, however,
// rememver why, so need to revisit this line.
c.Writer.Header().Del("Content-Type")
tmpuser, err := remote.GetUser(c, c.Writer, c.Request)
if err != nil {
log.Errorf("cannot authenticate user. %s", err)
c.Redirect(303, "/login?error=oauth_error")
return
}
// this will happen when the user is redirected by
// the remote provide as part of the oauth dance.
if tmpuser == nil {
return
}
// get the user from the database
u, err := store.GetUserLogin(c, tmpuser.Login)
if err != nil {
// create the user account
u = &model.User{}
u.Login = tmpuser.Login
u.Token = tmpuser.Token
u.Avatar = tmpuser.Avatar
u.Secret = model.Rand()
// insert the user into the database
if err := store.CreateUser(c, u); err != nil {
log.Errorf("cannot insert %s. %s", u.Login, err)
c.Redirect(303, "/login?error=internal_error")
return
}
}
// update the user meta data and authorization
// data and cache in the datastore.
u.Token = tmpuser.Token
u.Avatar = tmpuser.Avatar
if err := store.UpdateUser(c, u); err != nil {
log.Errorf("cannot update %s. %s", u.Login, err)
c.Redirect(303, "/login?error=internal_error")
return
}
exp := time.Now().Add(time.Hour * 72).Unix()
token := token.New(token.SessToken, u.Login)
tokenstr, err := token.SignExpires(u.Secret, exp)
if err != nil {
log.Errorf("cannot create token for %s. %s", u.Login, err)
c.Redirect(303, "/login?error=internal_error")
return
}
httputil.SetCookie(c.Writer, c.Request, "user_sess", tokenstr)
c.Redirect(303, "/")
}
