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sqlbackend.go
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sqlbackend.go
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package main
import (
"bufio"
"crypto/sha256"
"database/sql"
"errors"
"fmt"
"io"
"log"
"net/smtp"
"os"
"time"
_ "github.com/go-sql-driver/mysql"
_ "github.com/mattn/go-sqlite3"
"github.com/peterverraedt/tinylist/list"
"gopkg.in/alecthomas/kingpin.v2"
"gopkg.in/ini.v1"
)
// An SQLBackend is an implementation of list.Backend
type SQLBackend struct {
Log string `ini:"log"`
Driver string `ini:"driver"`
Database string `ini:"database"`
config list.Config
db *sql.DB
}
// NewSQLBackend from the on-disk config file
func NewSQLBackend() *SQLBackend {
return &SQLBackend{}
}
// LoadConfig loads a config file and needs to be called before using it as a Backend interface
func (b *SQLBackend) LoadConfig(configFile string, debug bool) error {
var (
err error
cfg *ini.File
)
if len(configFile) > 0 {
cfg, err = ini.Load(configFile)
} else {
cfg, err = ini.LooseLoad("tinylist.ini", "/usr/local/etc/tinylist.ini", "/etc/tinylist.ini")
}
if err != nil {
return fmt.Errorf("Config ini error: %s", err.Error())
}
err = cfg.Section("").MapTo(b)
if err != nil {
return fmt.Errorf("Config parse error (global): %s", err.Error())
}
b.config = list.Config{}
err = cfg.Section("bot").MapTo(&b.config)
if err != nil {
return fmt.Errorf("Config parse error (bot): %s", err.Error())
}
if debug {
b.config.Debug = true
}
err = b.openDB()
if err != nil {
return fmt.Errorf("Database error: %s", err.Error())
}
return nil
}
func (b *SQLBackend) openDB() (err error) {
var (
driver string
queries []string
)
switch b.Driver {
case "mysql":
driver = "mysql"
queries = append(queries,
`CREATE TABLE IF NOT EXISTS lists (
list VARCHAR(255) PRIMARY KEY,
name VARCHAR(255) NOT NULL,
description VARCHAR(255) NOT NULL,
hidden INTEGER(1) NOT NULL,
locked INTEGER(1) NOT NULL,
subscribers_only INTEGER(1) NOT NULL
)`,
`CREATE TABLE IF NOT EXISTS bcc (
list VARCHAR(255) NOT NULL,
address VARCHAR(255) NOT NULL,
UNIQUE KEY list_address (list,address)
)`,
`CREATE TABLE IF NOT EXISTS posters (
list VARCHAR(255) NOT NULL,
address VARCHAR(255) NOT NULL,
UNIQUE KEY list_address (list,address)
)`,
`CREATE TABLE IF NOT EXISTS subscriptions (
list VARCHAR(255) NOT NULL,
user VARCHAR(255) NOT NULL,
bounces INTEGER NOT NULL DEFAULT 0,
last_bounce DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00',
UNIQUE KEY list_user (list,user)
)`,
`CREATE TABLE IF NOT EXISTS archive (
list VARCHAR(255) NOT NULL,
id VARCHAR(255) NOT NULL,
sender VARCHAR(255) NOT NULL,
subject VARCHAR(255) NOT NULL,
date DATETIME NOT NULL,
message LONGBLOB NOT NULL,
UNIQUE KEY list_id (list,id)
)`)
default:
driver = "sqlite3"
queries = append(queries,
`CREATE TABLE IF NOT EXISTS lists (
list TEXT PRIMARY KEY,
name TEXT NOT NULL,
description TEXT NOT NULL,
hidden INTEGER(1) NOT NULL,
locked INTEGER(1) NOT NULL,
subscribers_only INTEGER(1) NOT NULL
)`,
`CREATE TABLE IF NOT EXISTS bcc (
list TEXT NOT NULL,
address TEXT NOT NULL,
UNIQUE(list,address)
)`,
`CREATE TABLE IF NOT EXISTS posters (
list TEXT NOT NULL,
address TEXT NOT NULL,
UNIQUE(list,address)
)`,
`CREATE TABLE IF NOT EXISTS subscriptions (
list TEXT NOT NULL,
user TEXT NOT NULL,
bounces INTEGER NOT NULL DEFAULT 0,
last_bounce DATETIME NOT NULL DEFAULT 0,
UNIQUE(list,user)
)`,
`CREATE TABLE IF NOT EXISTS archive (
list TEXT NOT NULL,
id TEXT NOT NULL,
sender TEXT NOT NULL,
subject TEXT NOT NULL,
date DATETIME NOT NULL,
message BLOB NOT NULL,
UNIQUE(list,id)
)`)
}
b.db, err = sql.Open(driver, b.Database)
if err != nil {
return
}
for _, query := range queries {
_, err = b.db.Exec(query)
if err != nil {
return
}
}
return nil
}
func (b *SQLBackend) openLog() error {
logFile, err := os.OpenFile(b.Log, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err != nil {
return err
}
out := io.MultiWriter(logFile, os.Stderr)
log.SetOutput(out)
return nil
}
func (b *SQLBackend) check(*kingpin.ParseContext) error {
err := b.openLog()
if err != nil {
return fmt.Errorf("There's a problem with the log: %s", err.Error())
}
client, err := smtp.Dial(fmt.Sprintf("%s:%d", b.config.SMTPHostname, b.config.SMTPPort))
if err != nil {
return fmt.Errorf("There's a problem connecting to your SMTP server: %s", err.Error())
}
if b.config.SMTPUsername != "" {
auth := smtp.PlainAuth("", b.config.SMTPUsername, b.config.SMTPPassword, b.config.SMTPHostname)
err = client.Auth(auth)
if err != nil {
return fmt.Errorf("There's a problem authenticating with your SMTP server: %s", err.Error())
}
}
return nil
}
func (b *SQLBackend) message(*kingpin.ParseContext) error {
err := b.openLog()
if err != nil {
return err
}
bot := list.NewBot(b)
return bot.Handle(bufio.NewReader(os.Stdin))
}
func (b *SQLBackend) Config() list.Config {
return b.config
}
// Lists returns all lists
func (c *SQLBackend) Lists() ([]list.Definition, error) {
rows, err := c.db.Query("SELECT list, name, description, hidden, locked, subscribers_only FROM lists ORDER BY list")
if err != nil {
return nil, err
}
result := []list.Definition{}
defer rows.Close()
for rows.Next() {
l, err := c.fetchList(rows.Scan)
if err != nil {
return nil, err
}
result = append(result, l)
}
return result, rows.Err()
}
// LookupList returns a specific list, or nil if not found
func (b *SQLBackend) LookupList(name string) (*list.Definition, error) {
row := b.db.QueryRow("SELECT list, name, description, hidden, locked, subscribers_only FROM lists WHERE list=?", name)
if err := row.Err(); errors.Is(err, sql.ErrNoRows) {
return nil, nil
} else if err != nil {
return nil, err
}
l, err := b.fetchList(row.Scan)
if err != nil {
return nil, err
}
return &l, nil
}
func (b *SQLBackend) fetchList(scan func(dest ...interface{}) error) (list.Definition, error) {
l := list.Definition{}
err := scan(&l.Address, &l.Name, &l.Description, &l.Hidden, &l.Locked, &l.SubscribersOnly)
if err != nil {
return l, err
}
l.Posters, err = b.listPosters(l.Address)
if err != nil {
return l, err
}
l.Bcc, err = b.listBcc(l.Address)
return l, err
}
func (b *SQLBackend) listPosters(id string) ([]string, error) {
rows, err := b.db.Query("SELECT address FROM posters WHERE list=?", id)
if err != nil {
return nil, err
}
result := []string{}
defer rows.Close()
for rows.Next() {
var address string
err = rows.Scan(&address)
if err != nil {
return nil, err
}
result = append(result, address)
}
return result, rows.Err()
}
func (b *SQLBackend) listBcc(id string) ([]string, error) {
rows, err := b.db.Query("SELECT address FROM bcc WHERE list=?", id)
if err != nil {
return nil, err
}
result := []string{}
defer rows.Close()
for rows.Next() {
var address string
err = rows.Scan(&address)
if err != nil {
return nil, err
}
result = append(result, address)
}
return result, rows.Err()
}
// ListIsSubscribed method
func (b *SQLBackend) ListIsSubscribed(l list.Definition, user string) (*list.Subscription, error) {
s := &list.Subscription{
Address: user,
}
err := b.db.QueryRow("SELECT bounces, last_bounce FROM subscriptions WHERE user=? AND list=?", user, l.Address).Scan(&s.Bounces, &s.LastBounce)
if err == sql.ErrNoRows {
return nil, nil
} else if err != nil {
return nil, err
}
return s, nil
}
// ListSubscribers method
func (b *SQLBackend) ListSubscribers(l list.Definition) ([]list.Subscription, error) {
rows, err := b.db.Query("SELECT user, bounces, last_bounce FROM subscriptions WHERE list=?", l.Address)
if err != nil {
return nil, err
}
result := []list.Subscription{}
defer rows.Close()
for rows.Next() {
s := list.Subscription{}
err = rows.Scan(&s.Address, &s.Bounces, &s.LastBounce)
if err != nil {
return nil, err
}
result = append(result, s)
}
return result, rows.Err()
}
// ListSubscribe method
func (b *SQLBackend) ListSubscribe(l list.Definition, user string) error {
_, err := b.db.Exec("INSERT INTO subscriptions (user,list) VALUES(?,?)", user, l.Address)
return err
}
// ListUnsubscribe method
func (b *SQLBackend) ListUnsubscribe(l list.Definition, user string) error {
r, err := b.db.Exec("DELETE FROM subscriptions WHERE user=? AND list=?", user, l.Address)
if err != nil {
return err
}
n, err := r.RowsAffected()
if err != nil {
return err
}
if n == 0 {
return fmt.Errorf("user %s is not subscribed to list %s", user, l.Address)
}
return nil
}
// ListSetBounce method
func (b *SQLBackend) ListSetBounce(l list.Definition, user string, bounces uint16, lastBounce time.Time) error {
r, err := b.db.Exec("UPDATE subscriptions SET bounces = ?, last_bounce = ? WHERE user=? AND list=?", bounces, lastBounce, user, l.Address)
if err != nil {
return err
}
n, err := r.RowsAffected()
if err != nil {
return err
}
if n == 0 {
return fmt.Errorf("user %s is not subscribed to list %s", user, l.Address)
}
return nil
}
// ListArchive method.
func (b *SQLBackend) ListArchive(l list.Definition, msg *list.Message) error {
var (
data = []byte(msg.String())
id = fmt.Sprintf("%x", sha256.Sum256(data))
now = time.Now()
)
_, err := b.db.Exec(`INSERT INTO archive (list,id,sender,subject,date,message) VALUES(?,?,?,?,?,?)`,
l.Address,
id,
msg.From,
msg.Subject,
now,
data)
return err
}
// CreateList method
func (b *SQLBackend) CreateList(d list.Definition) error {
tx, _ := b.db.Begin()
_, err := tx.Exec("INSERT INTO lists (list, name, description, hidden, locked, subscribers_only) VALUES(?,?,?,?,?,?)",
d.Address, d.Name, d.Description, d.Hidden, d.Locked, d.SubscribersOnly)
if err != nil {
tx.Rollback()
return err
}
for _, address := range d.Posters {
if address == "" {
continue
}
_, err = tx.Exec("INSERT INTO posters (list, address) VALUES(?,?)", d.Address, address)
if err != nil {
tx.Rollback()
return err
}
}
for _, address := range d.Bcc {
if address == "" {
continue
}
_, err = tx.Exec("INSERT INTO bcc (list, address) VALUES(?,?)", d.Address, address)
if err != nil {
tx.Rollback()
return err
}
}
tx.Commit()
return nil
}
// ModifyList method
func (b *SQLBackend) ModifyList(a string, d list.Definition) error {
tx, _ := b.db.Begin()
_, err := tx.Exec("UPDATE lists SET list = ?, name = ?, description = ?, hidden = ?, locked = ?, subscribers_only = ? WHERE list = ?",
d.Address, d.Name, d.Description, d.Hidden, d.Locked, d.SubscribersOnly, a)
if err != nil {
tx.Rollback()
return err
}
if a != d.Address {
_, err := tx.Exec("UPDATE subscriptions SET list = ? WHERE list = ?", d.Address, a)
if err != nil {
tx.Rollback()
return err
}
}
_, err = tx.Exec("DELETE FROM posters WHERE list = ?", a)
if err != nil {
tx.Rollback()
return err
}
for _, address := range d.Posters {
_, err = tx.Exec("INSERT INTO posters (list, address) VALUES(?,?)", d.Address, address)
if err != nil {
tx.Rollback()
return err
}
}
_, err = tx.Exec("DELETE FROM bcc WHERE list = ?", a)
if err != nil {
tx.Rollback()
return err
}
for _, address := range d.Bcc {
_, err = tx.Exec("INSERT INTO bcc (list, address) VALUES(?,?)", d.Address, address)
if err != nil {
tx.Rollback()
return err
}
}
tx.Commit()
return nil
}
// DeleteList method
func (b *SQLBackend) DeleteList(a string) error {
tx, _ := b.db.Begin()
_, err := tx.Exec("DELETE FROM subscriptions WHERE list = ?", a)
if err != nil {
tx.Rollback()
return err
}
_, err = tx.Exec("DELETE FROM bcc WHERE list = ?", a)
if err != nil {
tx.Rollback()
return err
}
_, err = tx.Exec("DELETE FROM posters WHERE list = ?", a)
if err != nil {
tx.Rollback()
return err
}
_, err = tx.Exec("DELETE FROM lists WHERE list = ?", a)
if err != nil {
tx.Rollback()
return err
}
tx.Commit()
return nil
}