Friendly, easy, lightweight, self-hostable CAPTCHA service. https://captcheck.netsyms.com
Du kannst nicht mehr als 25 Themen auswählen Themen müssen mit entweder einem Buchstaben oder einer Ziffer beginnen. Sie können Bindestriche („-“) enthalten und bis zu 35 Zeichen lang sein.
Skylar Ittner 987639decd Add index.html webpage vor 1 Jahr
db_upgrade Add (much) better text questions. vor 2 Jahren
images Initial commit vor 2 Jahren
nbproject Initial commit vor 2 Jahren
.gitignore Initial commit vor 2 Jahren
LICENSE Wrap text in license file vor 1 Jahr
api.php Fix a thing vor 2 Jahren
captcheck.css Override website theme link borders vor 1 Jahr
captcheck.dist.js Add support for nonces (put data-stylenonce="NONCE" on the div) vor 1 Jahr
captcheck.js Add support for nonces (put data-stylenonce="NONCE" on the div) vor 1 Jahr
composer.json Initial commit vor 2 Jahren
composer.lock Initial commit vor 2 Jahren
database.mwb Add (much) better text questions. vor 2 Jahren
database.sql Add (much) better text questions. vor 2 Jahren
index.html Add index.html webpage vor 1 Jahr
index.php Use event handlers instead of onClick and onEnter, for strict CSPs vor 1 Jahr
logo.png Add logo vor 2 Jahren
readme.md Update readme vor 1 Jahr
required.php Update readme, add SQL code, remove unused function in required.php vor 2 Jahren
scrapetexts.php Add (much) better text questions. vor 2 Jahren
settings.template.php Automatically delete old sessions vor 2 Jahren
test.html Add accessible format, add support for multiple CAPTCHAS on a page (use class instead of id for container) vor 2 Jahren
test.php Make sure question text is black, improve test sample vor 2 Jahren

readme.md

Captcheck

Easy, light, self-hostable CAPTCHA service. Works on modern browsers (and IE9+). Uses a selection of icons from Font-Awesome. Text-only accessibility mode 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.dist.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 another variable 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 nonce specified.

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