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db.go
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db.go
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package main
import (
"database/sql"
"errors"
"fmt"
"regexp"
"strings"
_ "github.com/go-sql-driver/mysql"
_ "github.com/lib/pq"
)
const table = "user_settings"
var usernameRe = regexp.MustCompile(`^[b-df-hj-np-tv-xz]{3}\d{3}$`)
// Settings user_settings
type Settings struct {
User string
Workmail string
FromWhitelist []string
ToWhitelist []string
Blacklist []string
}
// Whitelist a combined list of FromWhitelist and ToWhitelist
func (s *Settings) Whitelist() []string {
return s.ToWhitelist
}
func connect() (*sql.DB, error) {
switch Conf.DB.Type {
case "mysql":
dsn := fmt.Sprintf("%s:%s@/%s", Conf.DB.User, Conf.DB.Pass, Conf.DB.DBname)
return sql.Open("mysql", dsn)
default: // default is 'postgres'
dsn := fmt.Sprintf("postgres://%s:%s@/%s?sslmode=disable", Conf.DB.User, Conf.DB.Pass, Conf.DB.DBname)
return sql.Open("postgres", dsn)
}
}
// GetSettings get settings for user
func GetSettings(user string) (*Settings, error) {
if !usernameRe.MatchString(user) {
return nil, errors.New("invalid ku-username format")
}
db, err := connect()
if err != nil {
return nil, err
}
defer db.Close()
var from string
var to string
var blacklist string
var stmt string
switch Conf.DB.Type {
case "mysql":
stmt = fmt.Sprintf("SELECT username, workmail, fromwhitelist, towhitelist, blacklist FROM %s WHERE username=?", table)
default:
stmt = fmt.Sprintf("SELECT username, workmail, fromwhitelist, towhitelist, blacklist FROM %s WHERE username=$1", table)
}
row := db.QueryRow(stmt, user)
s := new(Settings)
err = row.Scan(&s.User, &s.Workmail, &from, &to, &blacklist)
if err == sql.ErrNoRows {
return nil, nil
}
s.FromWhitelist = splitWithoutEmpty(from, ";")
s.ToWhitelist = splitWithoutEmpty(to, ";")
s.Blacklist = splitWithoutEmpty(blacklist, ";")
return s, err
}
// Create new user_settings entry in DB
func (s *Settings) Create() error {
db, err := connect()
if err != nil {
return err
}
defer db.Close()
var stmt string
switch Conf.DB.Type {
case "mysql":
stmt = fmt.Sprintf("INSERT INTO %s (username, workmail, fromwhitelist, towhitelist, blacklist) VALUES (?, ?, ?, ?, ?)", table)
default:
stmt = fmt.Sprintf("INSERT INTO %s (username, workmail, fromwhitelist, towhitelist, blacklist) VALUES ($1, $2, $3, $4, $5)", table)
}
_, err = db.Exec(
stmt,
s.User,
s.Workmail,
joinWithoutEmpty(s.FromWhitelist, ";"),
joinWithoutEmpty(s.ToWhitelist, ";"),
joinWithoutEmpty(s.Blacklist, ";"))
return err
}
// Update user settings
func (s *Settings) Update() error {
db, err := connect()
if err != nil {
return err
}
defer db.Close()
var stmt string
switch Conf.DB.Type {
case "mysql":
stmt = fmt.Sprintf("UPDATE %s SET workmail=?, fromwhitelist=?, towhitelist=?, blacklist=? WHERE username=?", table)
default:
stmt = fmt.Sprintf("UPDATE %s SET workmail=$1, fromwhitelist=$2, towhitelist=$3, blacklist=$4 WHERE username=$5", table)
}
_, err = db.Exec(
stmt,
s.Workmail,
joinWithoutEmpty(s.FromWhitelist, ";"),
joinWithoutEmpty(s.ToWhitelist, ";"),
joinWithoutEmpty(s.Blacklist, ";"),
s.User)
return err
}
// join elements of a into a single string seperated by sep. Ignore empty
// strings in a
func joinWithoutEmpty(a []string, sep string) string {
joined := ""
for _, s := range a {
if s != "" {
if joined != "" {
joined += sep
}
joined += s
}
}
return joined
}
// split string at sep into []string not containing any strings of length 0
func splitWithoutEmpty(s, sep string) []string {
if s == "" {
return []string{}
}
return strings.Split(s, sep)
}