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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package client
import (
"bytes"
"encoding/json"
"fmt"
"os"
"path/filepath"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/osutil/sys"
"github.com/snapcore/snapd/osutil/user"
)
// User holds logged in user information.
type User struct {
ID int `json:"id,omitempty"`
Username string `json:"username,omitempty"`
Email string `json:"email,omitempty"`
Macaroon string `json:"macaroon,omitempty"`
Discharges []string `json:"discharges,omitempty"`
}
type loginData struct {
Email string `json:"email,omitempty"`
Password string `json:"password,omitempty"`
Otp string `json:"otp,omitempty"`
}
// Login logs user in.
func (client *Client) Login(email, password, otp string) (*User, error) {
postData := loginData{
Email: email,
Password: password,
Otp: otp,
}
var body bytes.Buffer
if err := json.NewEncoder(&body).Encode(postData); err != nil {
return nil, err
}
var user User
if _, err := client.doSync("POST", "/v2/login", nil, nil, &body, &user); err != nil {
return nil, err
}
if err := writeAuthData(user); err != nil {
return nil, fmt.Errorf("cannot persist login information: %v", err)
}
return &user, nil
}
// Logout logs the user out.
func (client *Client) Logout() error {
_, err := client.doSync("POST", "/v2/logout", nil, nil, nil, nil)
if err != nil {
return err
}
return removeAuthData()
}
// LoggedInUser returns the logged in User or nil
func (client *Client) LoggedInUser() *User {
u, err := readAuthData()
if err != nil {
return nil
}
return u
}
const authFileEnvKey = "SNAPD_AUTH_DATA_FILENAME"
func storeAuthDataFilename(homeDir string) string {
if fn := os.Getenv(authFileEnvKey); fn != "" {
return fn
}
if homeDir == "" {
real, err := osutil.UserMaybeSudoUser()
if err != nil {
panic(err)
}
homeDir = real.HomeDir
}
return filepath.Join(homeDir, ".snap", "auth.json")
}
// realUidGid finds the real user when the command is run
// via sudo. It returns the users record and uid,gid.
func realUidGid() (*user.User, sys.UserID, sys.GroupID, error) {
real, err := osutil.UserMaybeSudoUser()
if err != nil {
return nil, 0, 0, err
}
uid, gid, err := osutil.UidGid(real)
if err != nil {
return nil, 0, 0, err
}
return real, uid, gid, err
}
// writeAuthData saves authentication details for later reuse through ReadAuthData
func writeAuthData(user User) error {
real, uid, gid, err := realUidGid()
if err != nil {
return err
}
targetFile := storeAuthDataFilename(real.HomeDir)
out, err := json.Marshal(user)
if err != nil {
return err
}
return sys.RunAsUidGid(uid, gid, func() error {
if err := os.MkdirAll(filepath.Dir(targetFile), 0700); err != nil {
return err
}
return osutil.AtomicWriteFile(targetFile, out, 0600, 0)
})
}
// readAuthData reads previously written authentication details
func readAuthData() (*User, error) {
_, uid, _, err := realUidGid()
if err != nil {
return nil, err
}
var user User
sourceFile := storeAuthDataFilename("")
if err := sys.RunAsUidGid(uid, sys.FlagID, func() error {
f, err := os.Open(sourceFile)
if err != nil {
return err
}
defer f.Close()
dec := json.NewDecoder(f)
return dec.Decode(&user)
}); err != nil {
return nil, err
}
return &user, nil
}
// removeAuthData removes any previously written authentication details.
func removeAuthData() error {
_, uid, _, err := realUidGid()
if err != nil {
return err
}
filename := storeAuthDataFilename("")
return sys.RunAsUidGid(uid, sys.FlagID, func() error {
return os.Remove(filename)
})
}
|
