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<img src="https://source.netsyms.com/Netsyms/Captcheck/raw/master/logo.png" alt="Captcheck" style="max-width: 50%;" />
Easy, light, self-hostable CAPTCHA service. Works on modern browsers (andIE9+). Uses a selection of icons from Font-Awesome. Text-only accessibilitymode and support for keyboard-only operation.
Thanks to textcaptcha.com for supplying the data for the text CAPTCHA.
How to use----------
In your form, put an empty div with the class "captcheck_container".Add `captcheck.js` (or `captcheck.min.js`) into your page.
<!DOCTYPE html> <html> <head> <title>Captcheck Sample Form</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <script src="captcheck.js"></script> </head> <body> <form action="submit.php"> <input type="text" name="form_field" placeholder="Some random form field" /> <div class="captcheck_container"> </div> <button type="submit">Submit Form</button> </form> </body> </html>
When the form is submitted, your server will receive two extra form fields:`captcheck_session_code` and `captcheck_selected_answer`.In your form handling code, send a request to `http(s)://captcheck-url/api.php`.Pass the variables `session_id` and `answer_id` with the values sent with the form,and also pass the variable `action` with the value `verify`.You will receive a JSON response with (among other things) `"result": true` or`"result": false`. If result is false, the user failed the test, and anothervariable `msg` is available with an explanation.
Example URL:`http(s)://captcheck-url/api.php?action=verify&session_id=<captcheck_session_code>&answer_id=<captcheck_selected_answer>`
Example responses:`{"session":"some_session_id","result":true}``{"session":"some_session_id","result":false,"msg":"Answer incorrect."}`
###Content-Security-Policy and Nonces
Add `data-stylenonce="nonce_here"` to the `.captcheck_container` div.If you have multiple CAPTCHAs on one page, only one of them needs the noncespecified.
Installation------------
1. Run composer install.2. Copy settings.template.php to settings.php and plug in your settings.3. Install the database.4. Customize captcheck.js with the correct api_url.5. Follow the How to Use section and the example setup in test.html and test.php.
Execution Flow--------------
JS = captcheck.js, API = api.php, FORM = parent form, SITE = form processing code, -> = some action taken on the right by the left
JS -> API: Request session ID, question, and answers (with scrambled random codes) API -> JS: Sends info, saves session ID, correct answer, and scrambled answer codes in DB JS -> API: Requests answer images by sending scrambled value and session ID JS -> FORM: Adds hidden field with value=session ID, displays question and images (or text box) [USER SUBMITS FORM] SITE -> API: Sends session ID and answer API -> SITE: Responds with true/false to indicate if the answer is valid, marks session as expired to prevent CAPTCHA reuse
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