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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Modules\Mail\Application\Service\Message; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | use Throwable; |
| 12 | use Yiisoft\Cache\CacheInterface; |
| 13 | |
| 14 | /** |
| 15 | * Webmail Trusted Sender Service. |
| 16 | * |
| 17 | * Manages trusted sender email and domain records for remote external images display in webmail client. |
| 18 | * |
| 19 | * @package App\Modules\Mail\Application\Service\Message |
| 20 | */ |
| 21 | final readonly class WebmailTrustedSenderService |
| 22 | { |
| 23 | public const string TRUSTED_IMAGES_CACHE_PREFIX = 'webmail_trusted_img_'; |
| 24 | public const int TRUSTED_IMAGES_CACHE_TTL = 604800; // 7 days in seconds |
| 25 | |
| 26 | /** |
| 27 | * Common public freemail domains where domain-wide trust is disabled to prevent spoofing. |
| 28 | */ |
| 29 | public const array PUBLIC_FREEMAIL_DOMAINS = [ |
| 30 | 'gmail.com', |
| 31 | 'googlemail.com', |
| 32 | 'yahoo.com', |
| 33 | 'ymail.com', |
| 34 | 'outlook.com', |
| 35 | 'hotmail.com', |
| 36 | 'live.com', |
| 37 | 'msn.com', |
| 38 | 'icloud.com', |
| 39 | 'me.com', |
| 40 | 'mac.com', |
| 41 | 'wp.pl', |
| 42 | 'onet.pl', |
| 43 | 'interia.pl', |
| 44 | 'o2.pl', |
| 45 | 'gazeta.pl', |
| 46 | 'proton.me', |
| 47 | 'protonmail.com', |
| 48 | 'zoho.com', |
| 49 | 'aol.com', |
| 50 | ]; |
| 51 | |
| 52 | /** |
| 53 | * WebmailTrustedSenderService constructor. |
| 54 | * |
| 55 | * @param CacheInterface|null $cache Cache implementation. |
| 56 | */ |
| 57 | public function __construct( |
| 58 | private ?CacheInterface $cache = null, |
| 59 | ) { |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Normalizes an email address or address header string into a clean lowercase email. |
| 64 | * |
| 65 | * @param string $rawEmail Raw email address or formatted name & email. |
| 66 | * @return string Clean lowercase email address. |
| 67 | */ |
| 68 | public function normalizeSenderEmail(string $rawEmail): string |
| 69 | { |
| 70 | $clean = trim($rawEmail); |
| 71 | if (preg_match('/<([^>]+)>/', $clean, $matches)) { |
| 72 | $clean = trim($matches[1]); |
| 73 | } |
| 74 | return strtolower($clean); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Extracts lowercase domain from a normalized email address. |
| 79 | * |
| 80 | * @param string $email Normalized email address. |
| 81 | * @return string Domain or empty string. |
| 82 | */ |
| 83 | public function extractDomainFromEmail(string $email): string |
| 84 | { |
| 85 | $atPos = strrpos($email, '@'); |
| 86 | if ($atPos === false) { |
| 87 | return ''; |
| 88 | } |
| 89 | return strtolower(substr($email, $atPos + 1)); |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Records a sender email and organization domain into time-based trusted remote images cache. |
| 94 | * |
| 95 | * @param int $userId Owner user ID. |
| 96 | * @param string $cleanEmail Normalized lowercase email address. |
| 97 | * @param int $ttl Cache TTL in seconds (defaults to 7 days). |
| 98 | */ |
| 99 | public function trustSenderImages( |
| 100 | int $userId, |
| 101 | string $cleanEmail, |
| 102 | int $ttl = self::TRUSTED_IMAGES_CACHE_TTL, |
| 103 | ): void { |
| 104 | if ($this->cache === null || $userId <= 0 || $cleanEmail === '') { |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | try { |
| 109 | $psr = $this->cache->psr(); |
| 110 | $emailKey = self::TRUSTED_IMAGES_CACHE_PREFIX . $userId . '_email_' . hash('sha256', $cleanEmail); |
| 111 | $psr->set($emailKey, true, $ttl); |
| 112 | |
| 113 | $domain = $this->extractDomainFromEmail($cleanEmail); |
| 114 | if ($domain !== '' && !in_array($domain, self::PUBLIC_FREEMAIL_DOMAINS, true)) { |
| 115 | $domainKey = self::TRUSTED_IMAGES_CACHE_PREFIX . $userId . '_domain_' . hash('sha256', $domain); |
| 116 | $psr->set($domainKey, true, $ttl); |
| 117 | } |
| 118 | } catch (Throwable) { |
| 119 | // Cache write failure must not disrupt user flow |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Checks whether a sender email or organization server domain is present in trusted images cache. |
| 125 | * |
| 126 | * @param int $userId Owner user ID. |
| 127 | * @param string $cleanEmail Normalized lowercase email address. |
| 128 | * @return bool True if remote images are allowed by cache. |
| 129 | */ |
| 130 | public function isSenderImagesTrusted(int $userId, string $cleanEmail): bool |
| 131 | { |
| 132 | if ($this->cache === null || $userId <= 0 || $cleanEmail === '') { |
| 133 | return false; |
| 134 | } |
| 135 | |
| 136 | $trusted = false; |
| 137 | try { |
| 138 | $psr = $this->cache->psr(); |
| 139 | $emailKey = self::TRUSTED_IMAGES_CACHE_PREFIX . $userId . '_email_' . hash('sha256', $cleanEmail); |
| 140 | $domain = $this->extractDomainFromEmail($cleanEmail); |
| 141 | $isFreemail = in_array($domain, self::PUBLIC_FREEMAIL_DOMAINS, true); |
| 142 | $domainKey = $domain !== '' && !$isFreemail |
| 143 | ? self::TRUSTED_IMAGES_CACHE_PREFIX . $userId . '_domain_' . hash('sha256', $domain) |
| 144 | : null; |
| 145 | |
| 146 | $trusted = (bool) $psr->get($emailKey, false) |
| 147 | || ($domainKey !== null && (bool) $psr->get($domainKey, false)); |
| 148 | } catch (Throwable) { |
| 149 | $trusted = false; |
| 150 | } |
| 151 | |
| 152 | return $trusted; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Revokes trusted sender status from remote images cache. |
| 157 | * |
| 158 | * @param int $userId Owner user ID. |
| 159 | * @param string $cleanEmail Normalized lowercase email address. |
| 160 | */ |
| 161 | public function forgetTrustedSenderImages(int $userId, string $cleanEmail): void |
| 162 | { |
| 163 | if ($this->cache === null || $userId <= 0 || $cleanEmail === '') { |
| 164 | return; |
| 165 | } |
| 166 | |
| 167 | try { |
| 168 | $psr = $this->cache->psr(); |
| 169 | $emailKey = self::TRUSTED_IMAGES_CACHE_PREFIX . $userId . '_email_' . hash('sha256', $cleanEmail); |
| 170 | $psr->delete($emailKey); |
| 171 | |
| 172 | $domain = $this->extractDomainFromEmail($cleanEmail); |
| 173 | if ($domain !== '') { |
| 174 | $domainKey = self::TRUSTED_IMAGES_CACHE_PREFIX . $userId . '_domain_' . hash('sha256', $domain); |
| 175 | $psr->delete($domainKey); |
| 176 | } |
| 177 | } catch (Throwable) { |
| 178 | // Ignore cache deletion errors |
| 179 | } |
| 180 | } |
| 181 | } |