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db.go
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db.go
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package db
import (
"context"
"database/sql"
"github.com/deemkeen/stegodon/domain"
"github.com/deemkeen/stegodon/util"
"github.com/gliderlabs/ssh"
"github.com/google/uuid"
"log"
"modernc.org/sqlite"
sqlitelib "modernc.org/sqlite/lib"
"time"
)
// DB is the database struct.
type DB struct {
db *sql.DB
}
const (
//TODO add indices
//Accounts
sqlCreateUserTable = `CREATE TABLE IF NOT EXISTS accounts(
id uuid NOT NULL PRIMARY KEY,
username varchar(100) UNIQUE NOT NULL,
publickey varchar(1000) UNIQUE,
created_at timestamp default current_timestamp,
first_time_login int default 1,
web_public_key text,
web_private_key text
)`
sqlInsertUser = `INSERT INTO accounts(id, username, publickey, web_public_key, web_private_key, created_at) VALUES (?, ?, ?, ?, ?, ?)`
sqlUpdateLoginUser = `UPDATE accounts SET first_time_login = 0, username = ? WHERE publickey = ?`
sqlUpdateLoginUserById = `UPDATE accounts SET first_time_login = 0, username = ? WHERE id = ?`
sqlSelectUserByPublicKey = `SELECT id, username, publickey, created_at, first_time_login, web_public_key, web_private_key FROM accounts WHERE publickey = ?`
sqlSelectUserById = `SELECT id, username, publickey, created_at, first_time_login, web_public_key, web_private_key FROM accounts WHERE id = ?`
sqlSelectUserByUsername = `SELECT id, username, publickey, created_at, first_time_login, web_public_key, web_private_key FROM accounts WHERE username = ?`
//Notes
sqlCreateNotesTable = `CREATE TABLE IF NOT EXISTS notes(
id uuid NOT NULL PRIMARY KEY,
user_id uuid NOT NULL,
message varchar(1000),
created_at timestamp default current_timestamp
)`
sqlInsertNote = `INSERT INTO notes(id, user_id, message, created_at) VALUES (?, ?, ?, ?)`
sqlSelectNoteById = `SELECT notes.id, accounts.username, notes.message, notes.created_at FROM notes
INNER JOIN accounts ON accounts.id = notes.user_id
WHERE notes.id = ?`
sqlSelectNotesByUserId = `SELECT notes.id, accounts.username, notes.message, notes.created_at FROM notes
INNER JOIN accounts ON accounts.id = notes.user_id
WHERE notes.user_id = ?
ORDER BY notes.created_at DESC`
sqlSelectNotesByUsername = `SELECT notes.id, accounts.username, notes.message, notes.created_at FROM notes
INNER JOIN accounts ON accounts.id = notes.user_id
WHERE accounts.username = ?
ORDER BY notes.created_at DESC`
sqlSelectAllNotes = `SELECT notes.id, accounts.username, notes.message, notes.created_at FROM notes
INNER JOIN accounts ON accounts.id = notes.user_id
ORDER BY notes.created_at DESC`
)
func (db *DB) CreateAccount(s ssh.Session, username string) (error, bool) {
err, found := db.ReadAccBySession(s)
if err != nil {
log.Printf("No records for %s found, creating new user..", username)
}
if found != nil {
return nil, true
}
keypair := util.GeneratePemKeypair()
err2 := db.CreateAccByUsername(s, username, keypair)
if err2 != nil {
log.Println("Creating new user failed: ", err2)
return err2, false
}
return nil, true
}
func (db *DB) CreateAccByUsername(s ssh.Session, username string, webKeyPair *util.RsaKeyPair) error {
return db.wrapTransaction(func(tx *sql.Tx) error {
err := db.insertUser(tx, username, util.PublicKeyToString(s.PublicKey()), webKeyPair)
if err != nil {
return err
}
return nil
})
}
func (db *DB) CreateNote(userId uuid.UUID, message string) error {
return db.wrapTransaction(func(tx *sql.Tx) error {
err := db.insertNote(tx, userId, message)
if err != nil {
return err
}
return nil
})
}
func (db *DB) UpdateLoginByPkHash(username string, pkHash string) error {
return db.wrapTransaction(func(tx *sql.Tx) error {
err := db.updateLoginUser(tx, username, pkHash)
if err != nil {
return err
}
return nil
})
}
func (db *DB) UpdateLoginById(username string, id uuid.UUID) error {
return db.wrapTransaction(func(tx *sql.Tx) error {
err := db.updateLoginUserById(tx, username, id)
if err != nil {
return err
}
return nil
})
}
func (db *DB) ReadAccBySession(s ssh.Session) (error, *domain.Account) {
publicKeyToString := util.PublicKeyToString(s.PublicKey())
var tempAcc domain.Account
row := db.db.QueryRow(sqlSelectUserByPublicKey, util.PkToHash(publicKeyToString))
err := row.Scan(&tempAcc.Id, &tempAcc.Username, &tempAcc.Publickey, &tempAcc.CreatedAt, &tempAcc.FirstTimeLogin, &tempAcc.WebPublicKey, &tempAcc.WebPrivateKey)
if err == sql.ErrNoRows {
return err, nil
}
return err, &tempAcc
}
func (db *DB) ReadAccByPkHash(pkHash string) (error, *domain.Account) {
row := db.db.QueryRow(sqlSelectUserByPublicKey, pkHash)
var tempAcc domain.Account
err := row.Scan(&tempAcc.Id, &tempAcc.Username, &tempAcc.Publickey, &tempAcc.CreatedAt, &tempAcc.FirstTimeLogin, &tempAcc.WebPublicKey, &tempAcc.WebPrivateKey)
if err == sql.ErrNoRows {
return err, nil
}
return err, &tempAcc
}
func (db *DB) ReadAccById(id uuid.UUID) (error, *domain.Account) {
row := db.db.QueryRow(sqlSelectUserById, id)
var tempAcc domain.Account
err := row.Scan(&tempAcc.Id, &tempAcc.Username, &tempAcc.Publickey, &tempAcc.CreatedAt, &tempAcc.FirstTimeLogin, &tempAcc.WebPublicKey, &tempAcc.WebPrivateKey)
if err == sql.ErrNoRows {
return err, nil
}
return err, &tempAcc
}
func (db *DB) ReadAccByUsername(username string) (error, *domain.Account) {
row := db.db.QueryRow(sqlSelectUserByUsername, username)
var tempAcc domain.Account
err := row.Scan(&tempAcc.Id, &tempAcc.Username, &tempAcc.Publickey, &tempAcc.CreatedAt, &tempAcc.FirstTimeLogin, &tempAcc.WebPublicKey, &tempAcc.WebPrivateKey)
if err == sql.ErrNoRows {
return err, nil
}
return err, &tempAcc
}
func (db *DB) ReadNotesByUserId(userId uuid.UUID) (error, *[]domain.Note) {
rows, err := db.db.Query(sqlSelectNotesByUserId, userId)
if err != nil {
return err, nil
}
defer rows.Close()
var notes []domain.Note
for rows.Next() {
var note domain.Note
if err := rows.Scan(¬e.Id, ¬e.CreatedBy, ¬e.Message, ¬e.CreatedAt); err != nil {
return err, ¬es
}
notes = append(notes, note)
}
if err = rows.Err(); err != nil {
return err, ¬es
}
return nil, ¬es
}
func (db *DB) ReadNotesByUsername(username string) (error, *[]domain.Note) {
rows, err := db.db.Query(sqlSelectNotesByUsername, username)
if err != nil {
return err, nil
}
defer rows.Close()
var notes []domain.Note
for rows.Next() {
var note domain.Note
if err := rows.Scan(¬e.Id, ¬e.CreatedBy, ¬e.Message, ¬e.CreatedAt); err != nil {
return err, ¬es
}
notes = append(notes, note)
}
if err = rows.Err(); err != nil {
return err, ¬es
}
return nil, ¬es
}
func (db *DB) ReadNoteId(id uuid.UUID) (error, *domain.Note) {
row := db.db.QueryRow(sqlSelectNoteById, id)
var note domain.Note
err := row.Scan(¬e.Id, ¬e.CreatedBy, ¬e.Message, ¬e.CreatedAt)
if err == sql.ErrNoRows {
return err, nil
}
return err, ¬e
}
func (db *DB) ReadAllNotes() (error, *[]domain.Note) {
rows, err := db.db.Query(sqlSelectAllNotes)
if err != nil {
return err, nil
}
defer rows.Close()
var notes []domain.Note
for rows.Next() {
var note domain.Note
if err := rows.Scan(¬e.Id, ¬e.CreatedBy, ¬e.Message, ¬e.CreatedAt); err != nil {
return err, ¬es
}
notes = append(notes, note)
}
if err = rows.Err(); err != nil {
return err, ¬es
}
return nil, ¬es
}
func GetDB() *DB {
//TODO optimize db access
var err error
db, err := sql.Open("sqlite", "database.db")
if err != nil {
panic(err)
}
log.Printf("new db operation")
d := &DB{db: db}
err2 := d.CreateDB()
if err2 != nil {
panic(err2)
}
return d
}
// CreateDB creates the database.
func (db *DB) CreateDB() error {
return db.wrapTransaction(func(tx *sql.Tx) error {
err := db.createUserTable(tx)
if err != nil {
return err
}
err2 := db.createNotesTable(tx)
if err2 != nil {
return err2
}
return nil
})
}
func (db *DB) createUserTable(tx *sql.Tx) error {
_, err := tx.Exec(sqlCreateUserTable)
return err
}
func (db *DB) createNotesTable(tx *sql.Tx) error {
_, err := tx.Exec(sqlCreateNotesTable)
return err
}
func (db *DB) insertUser(tx *sql.Tx, username string, publicKey string, webKeyPair *util.RsaKeyPair) error {
_, err := tx.Exec(sqlInsertUser, uuid.New(), username, util.PkToHash(publicKey), webKeyPair.Public, webKeyPair.Private, time.Now())
return err
}
func (db *DB) insertNote(tx *sql.Tx, userId uuid.UUID, message string) error {
_, err := tx.Exec(sqlInsertNote, uuid.New(), userId, message, time.Now())
return err
}
func (db *DB) updateLoginUser(tx *sql.Tx, username string, pkHash string) error {
_, err := tx.Exec(sqlUpdateLoginUser, username, pkHash)
return err
}
func (db *DB) updateLoginUserById(tx *sql.Tx, username string, id uuid.UUID) error {
_, err := tx.Exec(sqlUpdateLoginUserById, username, id)
return err
}
// wrapTransaction runs the given function within a transaction.
func (db *DB) wrapTransaction(f func(tx *sql.Tx) error) error {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
tx, err := db.db.BeginTx(ctx, nil)
if err != nil {
log.Printf("error starting transaction: %s", err)
return err
}
for {
err = f(tx)
if err != nil {
serr, ok := err.(*sqlite.Error)
if ok && serr.Code() == sqlitelib.SQLITE_BUSY {
continue
}
log.Printf("error in transaction: %s", err)
return err
}
err = tx.Commit()
if err != nil {
log.Printf("error committing transaction: %s", err)
return err
}
break
}
return nil
}