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webuser.go
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webuser.go
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// Copyright (c) 2016 Readium Foundation
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// 3. Neither the name of the organization nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package webuser
import (
"database/sql"
"errors"
"log"
"strings"
"github.com/readium/readium-lcp-server/config"
"github.com/satori/go.uuid"
)
//ErrNotFound error trown when user is not found
var ErrNotFound = errors.New("User not found")
// WebUser interface for user db interaction
type WebUser interface {
Get(id int64) (User, error)
GetByEmail(email string) (User, error)
Add(c User) error
Update(c User) error
DeleteUser(UserID int64) error
ListUsers(page int, pageNum int) func() (User, error)
}
//User struct defines a user
type User struct {
ID int64 `json:"id"`
UUID string `json:"uuid"`
Name string `json:"name,omitempty"`
Email string `json:"email,omitempty"`
Password string `json:"password,omitempty"`
Hint string `json:"hint"`
}
type dbUser struct {
db *sql.DB
getUser *sql.Stmt
getByEmail *sql.Stmt
}
func (user dbUser) Get(id int64) (User, error) {
records, err := user.getUser.Query(id)
defer records.Close()
if records.Next() {
var c User
err = records.Scan(&c.ID, &c.UUID, &c.Name, &c.Email, &c.Password, &c.Hint)
return c, err
}
return User{}, ErrNotFound
}
func (user dbUser) GetByEmail(email string) (User, error) {
records, err := user.getByEmail.Query(email)
defer records.Close()
if records.Next() {
var c User
err = records.Scan(&c.ID, &c.UUID, &c.Name, &c.Email, &c.Password, &c.Hint)
return c, err
}
return User{}, ErrNotFound
}
func (user dbUser) Add(newUser User) error {
add, err := user.db.Prepare("INSERT INTO user (uuid, name, email, password, hint) VALUES (?, ?, ?, ?, ?)")
if err != nil {
return err
}
defer add.Close()
// Create uuid
uid, err_u := uuid.NewV4()
if err_u != nil {
return err_u
}
newUser.UUID = uid.String()
_, err = add.Exec(newUser.UUID, newUser.Name, newUser.Email, newUser.Password, newUser.Hint)
return err
}
func (user dbUser) Update(changedUser User) error {
add, err := user.db.Prepare("UPDATE user SET name=? , email=?, password=?, hint=? WHERE id=?")
if err != nil {
return err
}
defer add.Close()
_, err = add.Exec(changedUser.Name, changedUser.Email, changedUser.Password, changedUser.Hint, changedUser.ID)
return err
}
func (user dbUser) DeleteUser(userID int64) error {
// delete purchases from user
delPurchases, err := user.db.Prepare(`DELETE FROM purchase WHERE user_id=?`)
if err != nil {
return err
}
defer delPurchases.Close()
if _, err := delPurchases.Exec(userID); err != nil {
return err
}
// and delete user
query, err := user.db.Prepare("DELETE FROM user WHERE id=?")
if err != nil {
return err
}
defer query.Close()
_, err = query.Exec(userID)
return err
}
func (user dbUser) ListUsers(page int, pageNum int) func() (User, error) {
listUsers, err := user.db.Query(`SELECT id, uuid, name, email, password, hint
FROM user
ORDER BY email desc LIMIT ? OFFSET ? `, page, pageNum*page)
if err != nil {
return func() (User, error) { return User{}, err }
}
return func() (User, error) {
var u User
if listUsers.Next() {
err := listUsers.Scan(&u.ID, &u.UUID, &u.Name, &u.Email, &u.Password, &u.Hint)
if err != nil {
return u, err
}
} else {
listUsers.Close()
err = ErrNotFound
}
return u, err
}
}
//Open returns a WebUser interface (db interaction)
func Open(db *sql.DB) (i WebUser, err error) {
// if sqlite, create the content table in the frontend db if it does not exist
if strings.HasPrefix(config.Config.FrontendServer.Database, "sqlite") {
_, err = db.Exec(tableDef)
if err != nil {
log.Println("Error creating user table")
return
}
}
get, err := db.Prepare("SELECT id, uuid, name, email, password, hint FROM user WHERE id = ? LIMIT 1")
if err != nil {
return
}
getByEmail, err := db.Prepare("SELECT id, uuid, name, email, password, hint FROM user WHERE email = ? LIMIT 1")
if err != nil {
return
}
i = dbUser{db, get, getByEmail}
return
}
const tableDef = "CREATE TABLE IF NOT EXISTS user (" +
"id integer NOT NULL PRIMARY KEY," +
"uuid varchar(255) NOT NULL," +
"name varchar(64) NOT NULL," +
"email varchar(64) NOT NULL," +
"password varchar(64) NOT NULL," +
"hint varchar(64) NOT NULL)"