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<h3>Introduction</h3>
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<ul class="list-unstyled">
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<li><a class="docs-link active" href="/docs/introduction/installing-captcha/">Installing mCaptcha on your website</a></li>
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<li><a class="docs-link" href="/docs/introduction/configuring-difficulty-factor/">Configuring Difficulty Factor</a></li>
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</ul>
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<h3>Terminology</h3>
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<li><a class="docs-link" href="/docs/terminology/access-token/">Access token</a></li>
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<li><a class="docs-link" href="/docs/terminology/cooldown-period/">Cooldown Period</a></li>
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<li><a class="docs-link" href="/docs/terminology/difficulty-factor/">Difficulty Factor</a></li>
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<li><a class="docs-link" href="/docs/terminology/sitekey/">Site key</a></li>
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<li><a class="docs-link" href="/docs/terminology/visitor-threshold/">Visitor Threshold</a></li>
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</ul>
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<h3>Self-Hosted</h3>
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<ul class="list-unstyled">
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<li><a class="docs-link" href="/docs/self-hosted/getting-started/">Getting started</a></li>
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<li><a class="docs-link" href="/docs/self-hosted/bare-metal/">Deploy bare metal</a></li>
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<li><a class="docs-link" href="/docs/self-hosted/docker/">Using Docker</a></li>
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<li><a class="docs-link" href="/docs/self-hosted/dependencies/">Database and cache</a></li>
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</ul>
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<h3>API</h3>
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<ul class="list-unstyled">
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<li><a class="docs-link" href="/docs/api/browser/">Browser libraries</a></li>
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<li><a class="docs-link" href="/docs/api/mcaptcha-system/">mCaptcha System Library</a></li>
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<li><a class="docs-link" href="/docs/api/pow-sha256/">pow_sha256</a></li>
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</ul>
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<h3>Help</h3>
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<li><a class="docs-link" href="/docs/help/troubleshooting/">Troubleshooting</a></li>
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<li><a class="docs-link" href="/docs/help/faq/">FAQ</a></li>
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<h3>On this page</h3>
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<nav id="TableOfContents">
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<ul>
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<li><a href="#1-create-an-account-and-sign-into-the-mcaptcha-dashboard">1. Create an account and sign into the mCaptcha dashboard</a></li>
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<li><a href="#2-create-new-site-key">2. Create new site key</a>
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<ul>
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<li><a href="#easy-modedocsintroductionconfiguring-difficulty-factoreasy-option"><a href="/docs/introduction/configuring-difficulty-factor/#easy-option">Easy Mode</a></a></li>
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</ul>
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</li>
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<li><a href="#3-copy-widget-link">3. Copy widget link</a></li>
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<li><a href="#4-install-mcaptcha-on-your-website">4. Install mCaptcha on your website</a></li>
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<li><a href="#5-configure-backend-to-authenticate-captcha-tokens">5. Configure backend to authenticate CAPTCHA tokens</a></li>
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</ul>
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<main class="docs-content col-lg-11 col-xl-9">
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<h1>Installing mCaptcha on your website</h1>
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<p class="lead"></p>
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<p>mCaptcha can protect your website from DDoS attacks. In this guide we’ll
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explore how to install mCaptcha on your website. The end result will be
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something like this, on your website:</p>
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<figure>
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<img class="img-fluid lazyload blur-up" data-sizes="auto" src="/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_20x0_resize_box_3.png" data-srcset="/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_800x0_resize_box_3.png 800w,/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_700x0_resize_box_3.png 700w,/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_600x0_resize_box_3.png 600w,/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_500x0_resize_box_3.png 500w" width="618" height="669" alt="A registration form with mCaptcha widget installed">
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<noscript><img class="img-fluid" sizes="100vw" srcset="/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_800x0_resize_box_3.png 800w,/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_700x0_resize_box_3.png 700w,/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_600x0_resize_box_3.png 600w,/docs/introduction/installing-captcha/mcaptcha-widget-installation-result_hub39801b2a229b4882fd00c2c83dd77fb_28299_500x0_resize_box_3.png 500w" src="/docs/introduction/installing-captcha/mcaptcha-widget-installation-result.png" width="618" height="669" alt="A registration form with mCaptcha widget installed"></noscript>
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</figure>
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<p>For the purpose of this demo, we will be using
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<a href="https://demo.mcaptcha.org">demo.mcaptcha.org</a>, a demo instance running
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in @realaravinth’s bedroom(for this same reason, it shouldn’t be used
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for anything serious)</p>
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<h2 id="1-create-an-account-and-sign-into-the-mcaptcha-dashboard">1. Create an account and sign into the mCaptcha dashboard<a href="#1-create-an-account-and-sign-into-the-mcaptcha-dashboard" class="anchor" aria-hidden="true">#</a> </h2>
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<p>Head over to <a href="https://demo.mcaptcha.org/join">demo.mcaptcha.org</a> and
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create an account. When ready, sign in.</p>
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<h2 id="2-create-new-site-key">2. Create new site key<a href="#2-create-new-site-key" class="anchor" aria-hidden="true">#</a> </h2>
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<p>A <a href="/docs/terminology/sitekey/">site key</a> is how a new CAPTCHA is configured within mCaptcha. To create
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a new site key, click on “New Site” button in the dashboard.</p>
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<figure>
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<img class="img-fluid lazyload blur-up" data-sizes="auto" src="/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_20x0_resize_box_3.png" data-srcset="/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_900x0_resize_box_3.png 900w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_800x0_resize_box_3.png 800w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_700x0_resize_box_3.png 700w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_600x0_resize_box_3.png 600w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_500x0_resize_box_3.png 500w" width="1825" height="857" alt="mCaptcha dashboard with the 'new site key' button highlighted">
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<noscript><img class="img-fluid" sizes="100vw" srcset="/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_900x0_resize_box_3.png 900w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_800x0_resize_box_3.png 800w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_700x0_resize_box_3.png 700w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_600x0_resize_box_3.png 600w,/docs/introduction/installing-captcha/new-sitekey-btn_hu4dc550a2e568d01f004e26fb8eb1b427_65746_500x0_resize_box_3.png 500w" src="/docs/introduction/installing-captcha/new-sitekey-btn.png" width="1825" height="857" alt="mCaptcha dashboard with the 'new site key' button highlighted"></noscript>
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</figure>
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<p>There are two options to create a new site key, easy and advanced. <strong>We
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are going to use the easy mode in this tutorial.</strong> If you are interested
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in learning more about the advance mode, please see <a href="/docs/introduction/configuring-difficulty-factor/#advance-option">here</a>.</p>
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<blockquote>
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<h3 id="easy-modedocsintroductionconfiguring-difficulty-factoreasy-option"><a href="/docs/introduction/configuring-difficulty-factor/#easy-option">Easy Mode</a><a href="#easy-modedocsintroductionconfiguring-difficulty-factoreasy-option" class="anchor" aria-hidden="true">#</a> </h3>
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<p>Easy mode asks a few basic statistics about your website and generates a
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configuration that should work for your website. Currently, easy mode is
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guided by assumptions on suitable difficulty factors to protect a
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website but it will be fine-tuned as mCaptcha sees more deployment.</p>
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<p>Configuration generated by easy mode can be tweaked later using the
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advance mode, as you become more familiar with how mCaptcha works.</p>
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</blockquote>
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<p>Fill the form and submit it.</p>
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<figure>
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<img class="img-fluid lazyload blur-up" data-sizes="auto" src="/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_20x0_resize_box_3.png" data-srcset="/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_900x0_resize_box_3.png 900w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_800x0_resize_box_3.png 800w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_700x0_resize_box_3.png 700w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_600x0_resize_box_3.png 600w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_500x0_resize_box_3.png 500w" width="720" height="452" alt="mCaptcha dashboard with the 'new site key' form in easy mode, with details filled in">
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<noscript><img class="img-fluid" sizes="100vw" srcset="/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_900x0_resize_box_3.png 900w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_800x0_resize_box_3.png 800w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_700x0_resize_box_3.png 700w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_600x0_resize_box_3.png 600w,/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled_hu0c237370199481610ab31adaa9c5a5e6_30108_500x0_resize_box_3.png 500w" src="/docs/introduction/installing-captcha/new-sitekey-easy-mode-filled.png" width="720" height="452" alt="mCaptcha dashboard with the 'new site key' form in easy mode, with details filled in"></noscript>
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</figure>
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<h2 id="3-copy-widget-link">3. Copy widget link<a href="#3-copy-widget-link" class="anchor" aria-hidden="true">#</a> </h2>
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<p>Submitting the form will take you to a page where site key configuration
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can be viewed. “View deployment” link will display CAPTCHA widget with
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the supplied configuration. Click on it and grab the widget link.</p>
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<h2 id="4-install-mcaptcha-on-your-website">4. Install mCaptcha on your website<a href="#4-install-mcaptcha-on-your-website" class="anchor" aria-hidden="true">#</a> </h2>
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<p>Integration support is available for some frontend JavaScript
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frameworks. To see full list of supported frameworks, please see
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<a href="https://github.com/mCaptcha/glue#framework-support">here</a>.</p>
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<p>There are two options to use the integration library to integrate
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mCaptcha on your website:</p>
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<ol>
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<li>Serve the integration library yourself</li>
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<li>Use a CDN like unpkg.com</li>
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</ol>
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<p>In this tutorial, we’ll be using the CDN.</p>
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<p><strong>Pasting the following snippet on the page, within the form</strong> that requires to be protected
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will load the mCaptcha widget with the configuration supplied. Be sure
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to replace <code>Your {{paste your widget link}}</code> with the link obtained from
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the previous step.</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-html" data-lang="html"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span><<span style="color:#ff79c6">div</span> <span style="color:#50fa7b">id</span><span style="color:#ff79c6">=</span><span style="color:#f1fa8c">"mcaptcha__widget-container"</span>></<span style="color:#ff79c6">div</span>>
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2</span><span><<span style="color:#ff79c6">script</span> <span style="color:#50fa7b">src</span><span style="color:#ff79c6">=</span><span style="color:#f1fa8c">"https://unpkg.com/@mcaptcha/vanilla-glue@0.1.0-alpha-2/dist/index.js"</span>></<span style="color:#ff79c6">script</span>>
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3</span><span><<span style="color:#ff79c6">script</span> <span style="color:#50fa7b">charset</span><span style="color:#ff79c6">=</span><span style="color:#f1fa8c">"utf-8"</span>>
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4</span><span> <span style="color:#8be9fd;font-style:italic">let</span> config <span style="color:#ff79c6">=</span> {
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5</span><span> widgetLink<span style="color:#ff79c6">:</span> <span style="color:#ff79c6">new</span> URL(
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6</span><span> {{paste yout widget link}}
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7</span><span> ),
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|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8</span><span> };
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|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9</span><span> <span style="color:#ff79c6">new</span> mcaptchaGlue.<span style="color:#ff79c6">default</span>(config);
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10</span><span></<span style="color:#ff79c6">script</span>>
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|
</span></span></code></pre></div><p>A full example is available
|
|
<a href="https://github.com/mCaptcha/glue/blob/ea576d875457de54d82bed3edfc4ee68302fa4d8/packages/vanilla/static/embeded.html">here</a>.</p>
|
|
<h2 id="5-configure-backend-to-authenticate-captcha-tokens">5. Configure backend to authenticate CAPTCHA tokens<a href="#5-configure-backend-to-authenticate-captcha-tokens" class="anchor" aria-hidden="true">#</a> </h2>
|
|
<ol>
|
|
<li>
|
|
<p>Get <a href="/docs/terminology/access-token">access token</a> from the user’s
|
|
form submission payload. The access token will be associated with a
|
|
parameter called <code>mcaptcha__token</code>.</p>
|
|
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span> mcaptcha_token <span style="color:#ff79c6">=</span> request<span style="color:#ff79c6">.</span>form[<span style="color:#f1fa8c">"mcaptcha__token"</span>]
|
|
</span></span></code></pre></div></li>
|
|
<li>
|
|
<p>Validate access token with mCaptcha instance</p>
|
|
</li>
|
|
</ol>
|
|
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span>payload <span style="color:#ff79c6">=</span> {
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2</span><span> <span style="color:#f1fa8c">"token"</span>: mcaptcha_token,
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3</span><span> <span style="color:#f1fa8c">"key"</span>: mcaptcha_sitekey, <span style="color:#6272a4"># captcha site key</span>
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4</span><span> <span style="color:#6272a4"># mCaptcha account secret; available in settings</span>
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5</span><span> <span style="color:#f1fa8c">"secret"</span>: mcaptcha_account_secret,
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6</span><span>}
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|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7</span><span>resp <span style="color:#ff79c6">=</span> requests<span style="color:#ff79c6">.</span>post(
|
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8</span><span> <span style="color:#f1fa8c">"https://demo.mcaptha.org/api/v1/pow/siteverify"</span>, json<span style="color:#ff79c6">=</span>payload
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9</span><span>)
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10</span><span>resp <span style="color:#ff79c6">=</span> resp<span style="color:#ff79c6">.</span>json()
|
|
</span></span></code></pre></div><ol start="3">
|
|
<li>If access token is valid, allow access to protected resource or deny
|
|
access.</li>
|
|
</ol>
|
|
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span> <span style="color:#ff79c6">if</span> resp[<span style="color:#f1fa8c">"valid"</span>] <span style="color:#ff79c6">==</span> <span style="color:#ff79c6">False</span>:
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span> <span style="color:#ff79c6">return</span> <span style="color:#f1fa8c">"invalid captcha"</span>, <span style="color:#bd93f9">400</span>
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span> <span style="color:#ff79c6">else</span>:
|
|
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span> <span style="color:#ff79c6">return</span> allow_access_to_protected_resource(request<span style="color:#ff79c6">.</span>form)
|
|
</span></span></code></pre></div><p>Please see here for a complete <a href="https://github.com/mCaptcha/dos/tree/8f2b53ab46d64fa78a8300dc8ce9d78578ffce12/server">Flask example</a> and here for an <a href="https://github.com/mCaptcha/dos/tree/8f2b53ab46d64fa78a8300dc8ce9d78578ffce12/rust-server/demo-server">Actix
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Web example</a>.</p>
|
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<p>Congratulations, mCaptcha is now integrated with your website!</p>
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<p class="edit-page"><a href="https://github.com/mCaptcha/website/blob/master/content/docs/introduction/installing-captcha/index.md"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-edit-2"><path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path></svg>Edit this page on GitHub</a></p>
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