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users.go
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users.go
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package main
import (
"bufio"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"golang.org/x/crypto/bcrypt"
)
type UserDB struct {
db map[string]*User
}
type User struct {
Name string
PasswordHash []byte
Access []string // List of trenches with read-write access
}
func NewUserDB(projectDir string) (*UserDB, error) {
usersFile := filepath.Join(projectDir, "users.txt")
f, err := os.Open(usersFile)
if err != nil {
return nil, fmt.Errorf("Invalid users file: %w", err)
}
defer f.Close()
db := make(map[string]*User)
sc := bufio.NewScanner(f)
lineno := 0
for sc.Scan() {
line := strings.TrimSpace(sc.Text())
lineno++
if strings.HasPrefix(line, "#") {
continue
}
t := strings.Split(line, ":")
if len(t) < 2 {
log.Printf("Syntax error at %s:%d", usersFile, lineno)
continue
}
name := t[0]
passwordHash := []byte(t[1])
access := []string{}
if len(t) >= 3 {
for _, trench := range strings.Split(t[2], ",") {
access = append(access, strings.TrimSpace(trench))
}
} else {
// Legacy file, assume write access to all trenches
access = append(access, "*")
}
db[name] = &User{Name: name, PasswordHash: passwordHash, Access: access}
}
return &UserDB{db: db}, sc.Err()
}
func (udb *UserDB) HasAccess(user, password string) bool {
u := udb.db[user]
if u == nil {
return false
}
err := bcrypt.CompareHashAndPassword(u.PasswordHash, []byte(password))
return err == nil
}
func (udb *UserDB) CanWriteTrench(user, trench string) bool {
u := udb.db[user]
if u == nil {
return false
}
for _, t := range u.Access {
if t == trench || t == "*" {
return true
}
}
return false
}