// Package main implements mail-admin, a read-only web view of the
// docker-mailserver accounts on mail.produktor.io.
package main

import (
	"bufio"
	"io"
	"strings"
)

// Account is one mailbox from postfix-accounts.cf.
type Account struct {
	Email string // full address, e.g. info@produktor.io
	Hash  string // SHA512-CRYPT hash from the accounts file (never displayed)
}

// parseAccounts reads a docker-mailserver postfix-accounts.cf file: one
// "email|hash" per line, '#' comments and blank lines skipped. Malformed
// lines are skipped, not fatal: a broken line must not hide the other
// accounts.
func parseAccounts(r io.Reader) ([]Account, error) {
	sc := bufio.NewScanner(r)
	var out []Account
	for sc.Scan() {
		line := strings.TrimSpace(sc.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		email, hash, ok := strings.Cut(line, "|")
		email = strings.TrimSpace(email)
		if !ok || email == "" {
			continue
		}
		out = append(out, Account{Email: email, Hash: strings.TrimSpace(hash)})
	}
	return out, sc.Err()
}