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plugin:captcha [2020/11/19 06:07] – [CAPTCHA] duncancplugin:captcha [2025/03/04 10:18] (current) – duncanc
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 +====== CAPTCHA ======
 +
 +---- plugin ----
 +
 +description: This plugin provides a CAPTCHA field on subscription forms.
 +author     : Duncan Cameron
 +type       : 
 +compatible : 3.x
 +depends    : 
 +conflicts  : 
 +similar    : 
 +tags       : spam
 +
 +sourcerepo : https://github.com/bramley/phplist-plugin-captcha
 +
 +----
 +
 +**Important** The Securimage package is no longer supported or recommended for use, see https://www.phpcaptcha.org/. If you want to use a captcha with phplist subscription forms then there are alternative phplist plugins
 +
 +[[https://resources.phplist.com/plugin/simplecaptcha|Simple Captcha plugin]]
 +
 +[[https://resources.phplist.com/plugin/recaptcha|reCAPTCHA V2 plugin]]
 +
 +[[https://resources.phplist.com/plugin/recaptchav3|reCAPTCHA V3 plugin]]
 +
 +[[https://resources.phplist.com/plugin/hCaptcha|hCaptcha plugin]]
 +
 +[[https://resources.phplist.com/plugin/friendly-captcha|Friendly Captcha plugin]]
 +
 +
 +
 +This plugin provides a CAPTCHA field on subscription forms using the [[https://www.phpcaptcha.org|Securimage]] package.
 +
 +The CAPTCHA requires that the user type the letters and digits of a distorted image. Securimage 
 +also provides a refresh button to display an alternative image, and an audio button to play a sound recording of the characters.
 +{{:plugin:captcha_1.png?nolink&500|}}
 +
 +The plugin can also check subscription emails for spam using the [[https://github.com/michield/botbouncer]] class. This currently uses only the Stop Forum Spam service to check email addresses, as that can be used without registering.
 +The other services supported by Botbouncer (Akismet, Project Honeypot, and Mollom) could be added if Stop Forum Spam proves not to be sufficient.
 +
 +For another approach to captcha see the [[https://resources.phplist.com/plugin/recaptcha|reCAPTCHA plugin]].
 +====== Installation ======
 +
 +See the README file on the GitHub page https://github.com/bramley/phplist-plugin-captcha
 +
 +===== Change to the Securimage code =====
 +
 +Starting in release 3.5.5 of phpList the php session is named 'phpListSession'.
 +
 +Therefore if you are using phpList release 3.5.5 or later then you need to make a small change to the Securimage code so that it uses that session name.
 +
 +In file securimage/securimage.php find this line. In release 3.6.7 of securimage it is line 487
 +
 +
 +<code php>    public $session_name   = null;</code>
 +
 +then change it to 
 +
 +<code php>    public $session_name   = 'phpListSession';</code>
 +
 +
 +
 +====== Configuration ======
 +
 +===== Settings =====
 +
 +On the Settings page you can specify:
 +
 +  * The path to the securimage directory on your web site (the default path is `/securimage`)
 +  * Whether to validate the email address using the BotBouncer class (the default is yes)
 +  * The prompt for the CAPTCHA field
 +  * The message to be displayed to the subscriber when the entered CAPTCHA is incorrect
 +  * The message to be displayed to the subscriber when the email address is rejected
 +  * Whether to write a record to the event log for each incorrect CAPTCHA and subscription attempt
 +  * Whether to send an email to the admin for each incorrect CAPTCHA and subscription attempt
 +{{:plugin:captcha_2.png?nolink&500|}}
 +===== Subscribe pages =====
 +
 +For each subscribe page that you create you can select whether it should include a captcha field.
 +{{:plugin:captcha_3.png?nolink|}}
 +===== Customising the appearance of the captcha =====
 +
 +The plugin does not support customising the appearance of the captcha widget. Instead you need to make minor modifications one of the Securimage files. See [[https://www.phpcaptcha.org/documentation/customizing-securimage/|this page]] of the Securimage documentation for more details.
 +
 +===== Changing the number of characters displayed in the captcha =====
 +
 +The captcha will display 6 characters by default. To alter this number you need to follow the guidance for customising the appearance of the captcha to modify the code_length property. For example to reduce the number of characters to 4:
 +
 +
 +  // display only 4 characters in the captcha
 +      $img->code_length = 4;
 +
 +
 +===== Internationalisation =====
 +
 +If your subscribe pages are in a language other than English then on the Settings page you can change the prompt and messages that are displayed to the subscriber to be in the local language.
 +
 +Securimage supports a limited number of languages for the audio playback.
 +See [[https://www.phpcaptcha.org/documentation/audio-file-settings/#language|Changing language files]] for how to change the language.
 +
 +====== Test that it works ======
 +
 +On your phplist subscription page enter all of the mandatory fields and an incorrect value in the CAPTCHA field.
 +The subscription attempt should be rejected.
 +
 +Go to [[https://www.stopforumspam.com/stats#datatable|Stop Forum Spam]] and select an email address from the Last 500 Entries.
 +Then try to subscribe to your lists using that email address. 
 +
 +
 +====== Support ======
 +Report any issues or questions in the support forum https://discuss.phplist.org/
 +