winframework /
winphp
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like SMTP often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use SMTP, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 30 | class SMTP |
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| 31 | { |
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| 32 | /** |
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| 33 | * The PHPMailer SMTP version number. |
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| 34 | * |
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| 35 | * @var string |
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| 36 | */ |
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| 37 | const VERSION = '6.0.1'; |
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| 38 | |||
| 39 | /** |
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| 40 | * SMTP line break constant. |
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| 41 | * |
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| 42 | * @var string |
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| 43 | */ |
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| 44 | const LE = "\r\n"; |
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| 45 | |||
| 46 | /** |
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| 47 | * The SMTP port to use if one is not specified. |
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| 48 | * |
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| 49 | * @var int |
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| 50 | */ |
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| 51 | const DEFAULT_PORT = 25; |
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| 52 | |||
| 53 | /** |
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| 54 | * The maximum line length allowed by RFC 2822 section 2.1.1. |
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| 55 | * |
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| 56 | * @var int |
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| 57 | */ |
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| 58 | const MAX_LINE_LENGTH = 998; |
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| 59 | |||
| 60 | /** |
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| 61 | * Debug level for no output. |
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| 62 | */ |
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| 63 | const DEBUG_OFF = 0; |
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| 64 | |||
| 65 | /** |
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| 66 | * Debug level to show client -> server messages. |
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| 67 | */ |
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| 68 | const DEBUG_CLIENT = 1; |
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| 69 | |||
| 70 | /** |
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| 71 | * Debug level to show client -> server and server -> client messages. |
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| 72 | */ |
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| 73 | const DEBUG_SERVER = 2; |
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| 74 | |||
| 75 | /** |
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| 76 | * Debug level to show connection status, client -> server and server -> client messages. |
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| 77 | */ |
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| 78 | const DEBUG_CONNECTION = 3; |
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| 79 | |||
| 80 | /** |
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| 81 | * Debug level to show all messages. |
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| 82 | */ |
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| 83 | const DEBUG_LOWLEVEL = 4; |
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| 84 | |||
| 85 | /** |
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| 86 | * Debug output level. |
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| 87 | * Options: |
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| 88 | * * self::DEBUG_OFF (`0`) No debug output, default |
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| 89 | * * self::DEBUG_CLIENT (`1`) Client commands |
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| 90 | * * self::DEBUG_SERVER (`2`) Client commands and server responses |
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| 91 | * * self::DEBUG_CONNECTION (`3`) As DEBUG_SERVER plus connection status |
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| 92 | * * self::DEBUG_LOWLEVEL (`4`) Low-level data output, all messages. |
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| 93 | * |
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| 94 | * @var int |
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| 95 | */ |
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| 96 | public $do_debug = self::DEBUG_OFF; |
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| 97 | |||
| 98 | /** |
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| 99 | * How to handle debug output. |
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| 100 | * Options: |
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| 101 | * * `echo` Output plain-text as-is, appropriate for CLI |
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| 102 | * * `html` Output escaped, line breaks converted to `<br>`, appropriate for browser output |
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| 103 | * * `error_log` Output to error log as configured in php.ini |
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| 104 | * Alternatively, you can provide a callable expecting two params: a message string and the debug level: |
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| 105 | * |
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| 106 | * ```php |
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| 107 | * $smtp->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";}; |
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| 108 | * ``` |
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| 109 | * |
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| 110 | * Alternatively, you can pass in an instance of a PSR-3 compatible logger, though only `debug` |
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| 111 | * level output is used: |
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| 112 | * |
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| 113 | * ```php |
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| 114 | * $mail->Debugoutput = new myPsr3Logger; |
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| 115 | * ``` |
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| 116 | * |
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| 117 | * @var string|callable|\Psr\Log\LoggerInterface |
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| 118 | */ |
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| 119 | public $Debugoutput = 'echo'; |
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| 120 | |||
| 121 | /** |
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| 122 | * Whether to use VERP. |
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| 123 | * |
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| 124 | * @see http://en.wikipedia.org/wiki/Variable_envelope_return_path |
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| 125 | * @see http://www.postfix.org/VERP_README.html Info on VERP |
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| 126 | * |
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| 127 | * @var bool |
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| 128 | */ |
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| 129 | public $do_verp = false; |
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| 130 | |||
| 131 | /** |
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| 132 | * The timeout value for connection, in seconds. |
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| 133 | * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2. |
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| 134 | * This needs to be quite high to function correctly with hosts using greetdelay as an anti-spam measure. |
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| 135 | * |
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| 136 | * @see http://tools.ietf.org/html/rfc2821#section-4.5.3.2 |
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| 137 | * |
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| 138 | * @var int |
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| 139 | */ |
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| 140 | public $Timeout = 300; |
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| 141 | |||
| 142 | /** |
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| 143 | * How long to wait for commands to complete, in seconds. |
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| 144 | * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2. |
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| 145 | * |
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| 146 | * @var int |
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| 147 | */ |
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| 148 | public $Timelimit = 300; |
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| 149 | |||
| 150 | /** |
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| 151 | * Patterns to extract an SMTP transaction id from reply to a DATA command. |
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| 152 | * The first capture group in each regex will be used as the ID. |
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| 153 | * MS ESMTP returns the message ID, which may not be correct for internal tracking. |
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| 154 | * |
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| 155 | * @var string[] |
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| 156 | */ |
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| 157 | protected $smtp_transaction_id_patterns = [ |
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| 158 | 'exim' => '/[0-9]{3} OK id=(.*)/', |
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| 159 | 'sendmail' => '/[0-9]{3} 2.0.0 (.*) Message/', |
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| 160 | 'postfix' => '/[0-9]{3} 2.0.0 Ok: queued as (.*)/', |
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| 161 | 'Microsoft_ESMTP' => '/[0-9]{3} 2.[0-9].0 (.*)@(?:.*) Queued mail for delivery/', |
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| 162 | 'Amazon_SES' => '/[0-9]{3} Ok (.*)/', |
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| 163 | ]; |
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| 164 | |||
| 165 | /** |
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| 166 | * The last transaction ID issued in response to a DATA command, |
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| 167 | * if one was detected. |
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| 168 | * |
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| 169 | * @var string|bool|null |
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| 170 | */ |
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| 171 | protected $last_smtp_transaction_id; |
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| 172 | |||
| 173 | /** |
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| 174 | * The socket for the server connection. |
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| 175 | * |
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| 176 | * @var ?resource |
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| 177 | */ |
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| 178 | protected $smtp_conn; |
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| 179 | |||
| 180 | /** |
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| 181 | * Error information, if any, for the last SMTP command. |
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| 182 | * |
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| 183 | * @var array |
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| 184 | */ |
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| 185 | protected $error = [ |
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| 186 | 'error' => '', |
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| 187 | 'detail' => '', |
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| 188 | 'smtp_code' => '', |
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| 189 | 'smtp_code_ex' => '', |
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| 190 | ]; |
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| 191 | |||
| 192 | /** |
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| 193 | * The reply the server sent to us for HELO. |
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| 194 | * If null, no HELO string has yet been received. |
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| 195 | * |
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| 196 | * @var string|null |
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| 197 | */ |
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| 198 | protected $helo_rply = null; |
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| 199 | |||
| 200 | /** |
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| 201 | * The set of SMTP extensions sent in reply to EHLO command. |
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| 202 | * Indexes of the array are extension names. |
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| 203 | * Value at index 'HELO' or 'EHLO' (according to command that was sent) |
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| 204 | * represents the server name. In case of HELO it is the only element of the array. |
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| 205 | * Other values can be boolean TRUE or an array containing extension options. |
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| 206 | * If null, no HELO/EHLO string has yet been received. |
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| 207 | * |
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| 208 | * @var array|null |
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| 209 | */ |
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| 210 | protected $server_caps = null; |
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| 211 | |||
| 212 | /** |
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| 213 | * The most recent reply received from the server. |
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| 214 | * |
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| 215 | * @var string |
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| 216 | */ |
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| 217 | protected $last_reply = ''; |
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| 218 | |||
| 219 | /** |
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| 220 | * Output debugging info via a user-selected method. |
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| 221 | * |
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| 222 | * @param string $str Debug string to output |
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| 223 | * @param int $level The debug level of this message; see DEBUG_* constants |
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| 224 | * |
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| 225 | * @see SMTP::$Debugoutput |
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| 226 | * @see SMTP::$do_debug |
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| 227 | */ |
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| 228 | protected function edebug($str, $level = 0) |
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| 276 | |||
| 277 | /** |
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| 278 | * Connect to an SMTP server. |
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| 279 | * |
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| 280 | * @param string $host SMTP server IP or host name |
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| 281 | * @param int $port The port number to connect to |
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| 282 | * @param int $timeout How long to wait for the connection to open |
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| 283 | * @param array $options An array of options for stream_context_create() |
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| 284 | * |
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| 285 | * @return bool |
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| 286 | */ |
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| 287 | public function connect($host, $port = null, $timeout = 30, $options = []) |
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| 376 | |||
| 377 | /** |
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| 378 | * Initiate a TLS (encrypted) session. |
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| 379 | * |
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| 380 | * @return bool |
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| 381 | */ |
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| 382 | public function startTLS() |
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| 409 | |||
| 410 | /** |
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| 411 | * Perform SMTP authentication. |
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| 412 | * Must be run after hello(). |
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| 413 | * |
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| 414 | * @see hello() |
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| 415 | * |
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| 416 | * @param string $username The user name |
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| 417 | * @param string $password The password |
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| 418 | * @param string $authtype The auth type (CRAM-MD5, PLAIN, LOGIN, XOAUTH2) |
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| 419 | * @param OAuth $OAuth An optional OAuth instance for XOAUTH2 authentication |
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| 420 | * |
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| 421 | * @return bool True if successfully authenticated |
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| 422 | */ |
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| 423 | public function authenticate( |
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| 543 | |||
| 544 | /** |
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| 545 | * Calculate an MD5 HMAC hash. |
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| 546 | * Works like hash_hmac('md5', $data, $key) |
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| 547 | * in case that function is not available. |
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| 548 | * |
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| 549 | * @param string $data The data to hash |
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| 550 | * @param string $key The key to hash with |
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| 551 | * |
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| 552 | * @return string |
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| 553 | */ |
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| 554 | protected function hmac($data, $key) |
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| 580 | |||
| 581 | /** |
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| 582 | * Check connection state. |
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| 583 | * |
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| 584 | * @return bool True if connected |
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| 585 | */ |
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| 586 | public function connected() |
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| 606 | |||
| 607 | /** |
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| 608 | * Close the socket and clean up the state of the class. |
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| 609 | * Don't use this function without first trying to use QUIT. |
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| 610 | * |
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| 611 | * @see quit() |
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| 612 | */ |
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| 613 | public function close() |
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| 625 | |||
| 626 | /** |
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| 627 | * Send an SMTP DATA command. |
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| 628 | * Issues a data command and sends the msg_data to the server, |
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| 629 | * finializing the mail transaction. $msg_data is the message |
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| 630 | * that is to be send with the headers. Each header needs to be |
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| 631 | * on a single line followed by a <CRLF> with the message headers |
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| 632 | * and the message body being separated by an additional <CRLF>. |
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| 633 | * Implements RFC 821: DATA <CRLF>. |
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| 634 | * |
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| 635 | * @param string $msg_data Message data to send |
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| 636 | * |
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| 637 | * @return bool |
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| 638 | */ |
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| 639 | public function data($msg_data) |
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| 719 | |||
| 720 | /** |
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| 721 | * Send an SMTP HELO or EHLO command. |
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| 722 | * Used to identify the sending server to the receiving server. |
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| 723 | * This makes sure that client and server are in a known state. |
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| 724 | * Implements RFC 821: HELO <SP> <domain> <CRLF> |
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| 725 | * and RFC 2821 EHLO. |
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| 726 | * |
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| 727 | * @param string $host The host name or IP to connect to |
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| 728 | * |
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| 729 | * @return bool |
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| 730 | */ |
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| 731 | public function hello($host = '') |
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| 736 | |||
| 737 | /** |
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| 738 | * Send an SMTP HELO or EHLO command. |
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| 739 | * Low-level implementation used by hello(). |
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| 740 | * |
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| 741 | * @param string $hello The HELO string |
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| 742 | * @param string $host The hostname to say we are |
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| 743 | * |
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| 744 | * @return bool |
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| 745 | * |
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| 746 | * @see hello() |
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| 747 | */ |
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| 748 | protected function sendHello($hello, $host) |
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| 760 | |||
| 761 | /** |
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| 762 | * Parse a reply to HELO/EHLO command to discover server extensions. |
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| 763 | * In case of HELO, the only parameter that can be discovered is a server name. |
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| 764 | * |
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| 765 | * @param string $type `HELO` or `EHLO` |
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| 766 | */ |
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| 767 | protected function parseHelloFields($type) |
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| 802 | |||
| 803 | /** |
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| 804 | * Send an SMTP MAIL command. |
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| 805 | * Starts a mail transaction from the email address specified in |
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| 806 | * $from. Returns true if successful or false otherwise. If True |
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| 807 | * the mail transaction is started and then one or more recipient |
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| 808 | * commands may be called followed by a data command. |
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| 809 | * Implements RFC 821: MAIL <SP> FROM:<reverse-path> <CRLF>. |
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| 810 | * |
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| 811 | * @param string $from Source address of this message |
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| 812 | * |
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| 813 | * @return bool |
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| 814 | */ |
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| 815 | public function mail($from) |
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| 825 | |||
| 826 | /** |
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| 827 | * Send an SMTP QUIT command. |
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| 828 | * Closes the socket if there is no error or the $close_on_error argument is true. |
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| 829 | * Implements from RFC 821: QUIT <CRLF>. |
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| 830 | * |
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| 831 | * @param bool $close_on_error Should the connection close if an error occurs? |
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| 832 | * |
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| 833 | * @return bool |
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| 834 | */ |
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| 835 | public function quit($close_on_error = true) |
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| 846 | |||
| 847 | /** |
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| 848 | * Send an SMTP RCPT command. |
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| 849 | * Sets the TO argument to $toaddr. |
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| 850 | * Returns true if the recipient was accepted false if it was rejected. |
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| 851 | * Implements from RFC 821: RCPT <SP> TO:<forward-path> <CRLF>. |
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| 852 | * |
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| 853 | * @param string $address The address the message is being sent to |
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| 854 | * |
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| 855 | * @return bool |
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| 856 | */ |
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| 857 | public function recipient($address) |
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| 865 | |||
| 866 | /** |
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| 867 | * Send an SMTP RSET command. |
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| 868 | * Abort any transaction that is currently in progress. |
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| 869 | * Implements RFC 821: RSET <CRLF>. |
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| 870 | * |
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| 871 | * @return bool True on success |
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| 872 | */ |
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| 873 | public function reset() |
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| 877 | |||
| 878 | /** |
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| 879 | * Send a command to an SMTP server and check its return code. |
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| 880 | * |
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| 881 | * @param string $command The command name - not sent to the server |
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| 882 | * @param string $commandstring The actual command to send |
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| 883 | * @param int|array $expect One or more expected integer success codes |
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| 884 | * |
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| 885 | * @return bool True on success |
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| 886 | */ |
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| 887 | protected function sendCommand($command, $commandstring, $expect) |
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| 943 | |||
| 944 | /** |
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| 945 | * Send an SMTP SAML command. |
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| 946 | * Starts a mail transaction from the email address specified in $from. |
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| 947 | * Returns true if successful or false otherwise. If True |
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| 948 | * the mail transaction is started and then one or more recipient |
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| 949 | * commands may be called followed by a data command. This command |
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| 950 | * will send the message to the users terminal if they are logged |
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| 951 | * in and send them an email. |
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| 952 | * Implements RFC 821: SAML <SP> FROM:<reverse-path> <CRLF>. |
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| 953 | * |
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| 954 | * @param string $from The address the message is from |
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| 955 | * |
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| 956 | * @return bool |
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| 957 | */ |
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| 958 | public function sendAndMail($from) |
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| 962 | |||
| 963 | /** |
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| 964 | * Send an SMTP VRFY command. |
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| 965 | * |
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| 966 | * @param string $name The name to verify |
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| 967 | * |
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| 968 | * @return bool |
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| 969 | */ |
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| 970 | public function verify($name) |
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| 974 | |||
| 975 | /** |
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| 976 | * Send an SMTP NOOP command. |
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| 977 | * Used to keep keep-alives alive, doesn't actually do anything. |
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| 978 | * |
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| 979 | * @return bool |
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| 980 | */ |
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| 981 | public function noop() |
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| 985 | |||
| 986 | /** |
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| 987 | * Send an SMTP TURN command. |
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| 988 | * This is an optional command for SMTP that this class does not support. |
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| 989 | * This method is here to make the RFC821 Definition complete for this class |
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| 990 | * and _may_ be implemented in future. |
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| 991 | * Implements from RFC 821: TURN <CRLF>. |
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| 992 | * |
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| 993 | * @return bool |
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| 994 | */ |
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| 995 | public function turn() |
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| 1002 | |||
| 1003 | /** |
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| 1004 | * Send raw data to the server. |
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| 1005 | * |
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| 1006 | * @param string $data The data to send |
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| 1007 | * |
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| 1008 | * @return int|bool The number of bytes sent to the server or false on error |
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| 1009 | */ |
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| 1010 | public function client_send($data) |
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| 1019 | |||
| 1020 | /** |
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| 1021 | * Get the latest error. |
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| 1022 | * |
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| 1023 | * @return array |
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| 1024 | */ |
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| 1025 | public function getError() |
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| 1029 | |||
| 1030 | /** |
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| 1031 | * Get SMTP extensions available on the server. |
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| 1032 | * |
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| 1033 | * @return array|null |
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| 1034 | */ |
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| 1035 | public function getServerExtList() |
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| 1039 | |||
| 1040 | /** |
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| 1041 | * Get metadata about the SMTP server from its HELO/EHLO response. |
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| 1042 | * The method works in three ways, dependent on argument value and current state: |
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| 1043 | * 1. HELO/EHLO has not been sent - returns null and populates $this->error. |
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| 1044 | * 2. HELO has been sent - |
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| 1045 | * $name == 'HELO': returns server name |
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| 1046 | * $name == 'EHLO': returns boolean false |
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| 1047 | * $name == any other string: returns null and populates $this->error |
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| 1048 | * 3. EHLO has been sent - |
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| 1049 | * $name == 'HELO'|'EHLO': returns the server name |
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| 1050 | * $name == any other string: if extension $name exists, returns True |
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| 1051 | * or its options (e.g. AUTH mechanisms supported). Otherwise returns False. |
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| 1052 | * |
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| 1053 | * @param string $name Name of SMTP extension or 'HELO'|'EHLO' |
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| 1054 | * |
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| 1055 | * @return mixed |
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| 1056 | */ |
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| 1057 | public function getServerExt($name) |
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| 1079 | |||
| 1080 | /** |
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| 1081 | * Get the last reply from the server. |
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| 1082 | * |
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| 1083 | * @return string |
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| 1084 | */ |
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| 1085 | public function getLastReply() |
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| 1089 | |||
| 1090 | /** |
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| 1091 | * Read the SMTP server's response. |
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| 1092 | * Either before eof or socket timeout occurs on the operation. |
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| 1093 | * With SMTP we can tell if we have more lines to read if the |
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| 1094 | * 4th character is '-' symbol. If it is a space then we don't |
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| 1095 | * need to read anything else. |
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| 1096 | * |
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| 1097 | * @return string |
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| 1098 | */ |
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| 1099 | protected function get_lines() |
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| 1154 | |||
| 1155 | /** |
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| 1156 | * Enable or disable VERP address generation. |
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| 1157 | * |
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| 1158 | * @param bool $enabled |
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| 1159 | */ |
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| 1160 | public function setVerp($enabled = false) |
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| 1164 | |||
| 1165 | /** |
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| 1166 | * Get VERP address generation mode. |
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| 1167 | * |
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| 1168 | * @return bool |
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| 1169 | */ |
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| 1170 | public function getVerp() |
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| 1174 | |||
| 1175 | /** |
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| 1176 | * Set error messages and codes. |
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| 1177 | * |
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| 1178 | * @param string $message The error message |
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| 1179 | * @param string $detail Further detail on the error |
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| 1180 | * @param string $smtp_code An associated SMTP error code |
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| 1181 | * @param string $smtp_code_ex Extended SMTP code |
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| 1182 | */ |
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| 1183 | protected function setError($message, $detail = '', $smtp_code = '', $smtp_code_ex = '') |
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| 1192 | |||
| 1193 | /** |
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| 1194 | * Set debug output method. |
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| 1195 | * |
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| 1196 | * @param string|callable $method The name of the mechanism to use for debugging output, or a callable to handle it |
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| 1197 | */ |
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| 1198 | public function setDebugOutput($method = 'echo') |
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| 1202 | |||
| 1203 | /** |
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| 1204 | * Get debug output method. |
||
| 1205 | * |
||
| 1206 | * @return string |
||
| 1207 | */ |
||
| 1208 | public function getDebugOutput() |
||
| 1212 | |||
| 1213 | /** |
||
| 1214 | * Set debug output level. |
||
| 1215 | * |
||
| 1216 | * @param int $level |
||
| 1217 | */ |
||
| 1218 | public function setDebugLevel($level = 0) |
||
| 1222 | |||
| 1223 | /** |
||
| 1224 | * Get debug output level. |
||
| 1225 | * |
||
| 1226 | * @return int |
||
| 1227 | */ |
||
| 1228 | public function getDebugLevel() |
||
| 1232 | |||
| 1233 | /** |
||
| 1234 | * Set SMTP timeout. |
||
| 1235 | * |
||
| 1236 | * @param int $timeout The timeout duration in seconds |
||
| 1237 | */ |
||
| 1238 | public function setTimeout($timeout = 0) |
||
| 1242 | |||
| 1243 | /** |
||
| 1244 | * Get SMTP timeout. |
||
| 1245 | * |
||
| 1246 | * @return int |
||
| 1247 | */ |
||
| 1248 | public function getTimeout() |
||
| 1252 | |||
| 1253 | /** |
||
| 1254 | * Reports an error number and string. |
||
| 1255 | * |
||
| 1256 | * @param int $errno The error number returned by PHP |
||
| 1257 | * @param string $errmsg The error message returned by PHP |
||
| 1258 | * @param string $errfile The file the error occurred in |
||
| 1259 | * @param int $errline The line number the error occurred on |
||
| 1260 | */ |
||
| 1261 | protected function errorHandler($errno, $errmsg, $errfile = '', $errline = 0) |
||
| 1274 | |||
| 1275 | /** |
||
| 1276 | * Extract and return the ID of the last SMTP transaction based on |
||
| 1277 | * a list of patterns provided in SMTP::$smtp_transaction_id_patterns. |
||
| 1278 | * Relies on the host providing the ID in response to a DATA command. |
||
| 1279 | * If no reply has been received yet, it will return null. |
||
| 1280 | * If no pattern was matched, it will return false. |
||
| 1281 | * |
||
| 1282 | * @return bool|null|string |
||
| 1283 | */ |
||
| 1284 | protected function recordLastTransactionID() |
||
| 1302 | |||
| 1303 | /** |
||
| 1304 | * Get the queue/transaction ID of the last SMTP transaction |
||
| 1305 | * If no reply has been received yet, it will return null. |
||
| 1306 | * If no pattern was matched, it will return false. |
||
| 1307 | * |
||
| 1308 | * @return bool|null|string |
||
| 1309 | * |
||
| 1310 | * @see recordLastTransactionID() |
||
| 1311 | */ |
||
| 1312 | public function getLastTransactionID() |
||
| 1316 | } |
||
| 1317 |
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Methods can only be called on objects. This check looks for methods being called on variables that have been inferred to never be objects.