Add accessible format, add support for multiple CAPTCHAS on a page (use class instead of id for container)

api.php

@@ -35,9 +35,15 @@ switch ($VARS['action']) {
             $scrambled_insert[] = ["sid" => $sid, "aid" => $scrambled['real'][$i], "acode" => $scrambled['fake'][$i]];
         }
         $database->insert("scrambled_answers", $scrambled_insert);
+        $questions = ["Please click on the [].", "Click the [].", "Find the []."];
+        $accessible_questions = ["Please type [] here.", "Enter [] into the box.", "Type []."];
+        shuffle($questions);
+        shuffle($accessible_questions);
         $resp = [
             "session" => $skey,
-            "question" => $correct_answer['aname'],
+            "id_prefix" => substr(hash("md5", mt_rand()), 3, 5),
+            "question_i" => str_replace("[]", $correct_answer['aname'], $questions[0]),
+            "question_a" => str_replace("[]", $correct_answer['aname'], $accessible_questions[0]),
             "answers" => $scrambled["fake"]
         ];
         exit(json_encode($resp));
@@ -88,15 +94,28 @@ switch ($VARS['action']) {
             echo json_encode(["session" => $VARS['session_id'], "result" => false, "msg" => "Session key already used."]);
             exit();
         }
-        if (!$database->has("scrambled_answers", ["AND" => ["sid" => $sid, "acode" => $VARS['answer_id']]])) {
+
+        $image = false;
+        if ($database->has("scrambled_answers", ["AND" => ["sid" => $sid, "acode" => $VARS['answer_id']]])) {
+            // Image maybe correct
+            $image = true;
+        } else if ($database->has("sessions", ["[>]answers" => ["aid" => "aid"]], ["AND" => ["sid" => $sid, "aname" => $VARS['answer_id']]])) {
+            // Accessible text correct
+            $image = false;
+        } else {
+            // Invalid answer
             echo json_encode(["session" => $VARS['session_id'], "result" => false, "msg" => "Answer invalid."]);
             exit();
         }
-        $aid = $database->get('scrambled_answers', 'aid', ["AND" => ["sid" => $sid, "acode" => $VARS['answer_id']]]);
-        if ($database->has('sessions', ["AND" => ["sid" => $sid, "aid" => $aid]])) {
-            echo json_encode(["session" => $VARS['session_id'], "result" => true]);
+        if ($image) {
+            $aid = $database->get('scrambled_answers', 'aid', ["AND" => ["sid" => $sid, "acode" => $VARS['answer_id']]]);
+            if ($database->has('sessions', ["AND" => ["sid" => $sid, "aid" => $aid]])) {
+                echo json_encode(["session" => $VARS['session_id'], "result" => true]);
+            } else {
+                echo json_encode(["session" => $VARS['session_id'], "result" => false, "msg" => "Answer incorrect."]);
+            }
         } else {
-            echo json_encode(["session" => $VARS['session_id'], "result" => false, "msg" => "Answer incorrect."]);
+            echo json_encode(["session" => $VARS['session_id'], "result" => true]);
         }
         $database->update("sessions", ['expired' => 1], ["sid" => $sid]);
         exit();

captcheck.css

@@ -42,4 +42,28 @@ Don't use this file in your site; captcheck.js contains it.
 
 .captcheck_error_message {
     color: red;
+}
+
+.captcheck_question_image {
+    display: initial;
+}
+
+.captcheck_question_access {
+    display: none;
+}
+
+.captcheck_alt_question_button {
+    float: right;
+    font-size: 80%;
+    cursor: pointer;
+    color: inherit;
+    text-decoration: inherit;
+}
+
+.captcheck_answer_images {
+    display: initial;
+}
+
+.captcheck_answer_access {
+    display: none;
 }

captcheck.dist.js

@@ -1 +1 @@
-function chooseAnswer(e){var a=document.getElementById("captcheck_answer_"+e);a.checked=!0}window.onload=function(){var e="https://captcheck.netsyms.com/api.php",a=function(e,a){var n=new XMLHttpRequest;n.open("GET",e,!0),n.onreadystatechange=function(){4==this.readyState&&a(this.status,this.responseText)},n.send()};a(e+"?action=new",function(a,n){var c=document.createElement("style");c.innerHTML=".captcheck_box,.captcheck_label_message,.captcheck_label_message b{color:#000;font-family:Ubuntu,Arial,sans-serif}.captcheck_box{border:1px solid #e0e0e0;border-radius:3px;display:inline-block;padding:3px;margin:5px 2px 5px 1px;background-color:#f5f5f5}.captcheck_answer_label>input{visibility:hidden;position:absolute}.captcheck_answer_label>input+img{cursor:pointer;border:2px solid transparent;border-radius:3px;min-width:32px;width:18%;max-width:64px}.captcheck_answer_label>input:checked+img{cursor:pointer;border:2px solid #424242;border-radius:3px}.captcheck_error_message{color:red}",document.body.appendChild(c);var t=document.getElementById("captcheck_container"),s=document.createElement("div");if(s.setAttribute("class","captcheck_box"),t.appendChild(s),200==a){for(var r=JSON.parse(n),i="",o=0,p=r.answers.length;p>o;o++){var d=e+"?action=img&s="+r.session+"&c="+r.answers[o];i+="<span class='captcheck_answer_label' onclick='chooseAnswer(\""+r.answers[o]+"\")'><input id='captcheck_answer_"+r.answers[o]+"' type='radio' name='captcheck_selected_answer' value='"+r.answers[o]+"' /><img src='"+d+"' /></span>"}var l=document.createElement("div");l.innerHTML=i;var h=document.createElement("div");h.setAttribute("class","captcheck_label_message"),h.innerHTML="Click on the <b>"+r.question+"</b>:",s.appendChild(h),s.appendChild(l);var u=document.createElement("span");u.innerHTML="<input type='hidden' name='captcheck_session_code' value='"+r.session+"' />",s.appendChild(u)}else s.innerHTML="<span class='captcheck_error_message'>There was a problem loading the CAPTCHA.</span>"})};
+function chooseAnswer(e,t){var a=document.getElementById("captcheck_"+e+"_answer_"+t);return a.checked=!0,!1}function switchMode(e){var t=document.getElementById("captcheck_"+e+"_alt_question_button"),a=document.getElementById("captcheck_"+e+"_question_image"),c=document.getElementById("captcheck_"+e+"_question_access"),n=document.getElementById("captcheck_"+e+"_answer_images"),s=document.getElementById("captcheck_"+e+"_answer_access");"&gt; Text mode"==t.innerHTML?(t.innerHTML="&gt; Image mode",a.style.display="none",c.style.display="initial",n.style.display="none",s.style.display="initial",s.innerHTML="<input type='text' name='captcheck_selected_answer' aria-label='Type your answer here.' autocomplete='off' autofill='off'/>"):(t.innerHTML="&gt; Text mode",a.style.display="initial",c.style.display="none",n.style.display="initial",s.style.display="none",s.innerHTML="")}window.onload=function(){var e="https://captcheck.netsyms.com/api.php",t=document.createElement("style");t.innerHTML=".captcheck_box,.captcheck_label_message,.captcheck_label_message b{color:#000;font-family:Ubuntu,Arial,sans-serif}.captcheck_box{border:1px solid #e0e0e0;border-radius:3px;display:inline-block;padding:3px;margin:5px 2px 5px 1px;background-color:#f5f5f5}.captcheck_answer_label>input{visibility:hidden;position:absolute}.captcheck_answer_label>input+img{cursor:pointer;border:2px solid transparent;border-radius:3px;min-width:32px;width:18%;max-width:64px}.captcheck_answer_label>input:checked+img{cursor:pointer;border:2px solid #424242;border-radius:3px}.captcheck_error_message{color:red}.captcheck_question_image{display:initial}.captcheck_question_access{display:none}.captcheck_alt_question_button{float:right;font-size:80%;cursor:pointer;color:inherit;text-decoration:inherit}.captcheck_answer_images{display:initial}.captcheck_answer_access{display:none}",document.body.appendChild(t),Array.prototype.forEach.call(document.getElementsByClassName("captcheck_container"),function(t){var a=new XMLHttpRequest;a.open("GET",e+"?action=new",!0),a.onreadystatechange=function(){if(4==this.readyState){var a=this.status,c=this.responseText,n=document.createElement("div");if(n.setAttribute("class","captcheck_box"),t.appendChild(n),200==a){for(var s=JSON.parse(c),i=s.id_prefix,r="<div class='captcheck_answer_images' id='captcheck_"+i+"_answer_images'>",o=0,l=s.answers.length;l>o;o++){var p=e+"?action=img&s="+s.session+"&c="+s.answers[o];r+="<a class='captcheck_answer_label' href='' tabindex='0' onClick='chooseAnswer(\""+i+'","'+s.answers[o]+"\"); return false;' onEnter='chooseAnswer(\""+i+'","'+s.answers[o]+"\"); return false;'><input id='captcheck_"+i+"_answer_"+s.answers[o]+"' type='radio' name='captcheck_selected_answer' value='"+s.answers[o]+"' /><img src='"+p+"' /></a>"}r+="</div>";var d=document.createElement("div");d.innerHTML=r+"<div class='captcheck_answer_access' id='captcheck_"+i+"_answer_access'></div>";var _=document.createElement("div");_.setAttribute("class","captcheck_label_message"),_.setAttribute("id","captcheck_"+i+"_label_message"),_.innerHTML="<span class='captcheck_question_image' id='captcheck_"+i+"_question_image'>"+s.question_i+"</span><span class='captcheck_question_access' id='captcheck_"+i+"_question_access'>"+s.question_a+"</span><a href='' class='captcheck_alt_question_button' onClick='switchMode(\""+i+"\"); return false;' onEnter='switchMode(\""+i+"\"); return false;' id='captcheck_"+i+"_alt_question_button' aria-label='Switch between image and text question' tabindex='0'>&gt; Text mode</a>",n.appendChild(_),n.appendChild(d);var h=document.createElement("span");h.innerHTML="<input type='hidden' name='captcheck_session_code' value='"+s.session+"' />",n.appendChild(h)}else n.innerHTML="<span class='captcheck_error_message'>There was a problem loading the CAPTCHA.</span>"}},a.send()})};

captcheck.js

@@ -1,60 +1,87 @@
 window.onload = function () {
     var api_url = "https://captcheck.netsyms.com/api.php";
-    var getJSON = function (url, callback) {
+
+    /* Add custom styles */
+    var styles = document.createElement('style');
+    /* Remove newlines/comments from captcheck.css and put it here */
+    styles.innerHTML = ".captcheck_box,.captcheck_label_message,.captcheck_label_message b{color:#000;font-family:Ubuntu,Arial,sans-serif}.captcheck_box{border:1px solid #e0e0e0;border-radius:3px;display:inline-block;padding:3px;margin:5px 2px 5px 1px;background-color:#f5f5f5}.captcheck_answer_label>input{visibility:hidden;position:absolute}.captcheck_answer_label>input+img{cursor:pointer;border:2px solid transparent;border-radius:3px;min-width:32px;width:18%;max-width:64px}.captcheck_answer_label>input:checked+img{cursor:pointer;border:2px solid #424242;border-radius:3px}.captcheck_error_message{color:red}.captcheck_question_image{display:initial}.captcheck_question_access{display:none}.captcheck_alt_question_button{float:right;font-size:80%;cursor:pointer;color:inherit;text-decoration:inherit}.captcheck_answer_images{display:initial}.captcheck_answer_access{display:none}";
+    document.body.appendChild(styles);
+
+    /* Loop over all the CAPTCHA containers on the page, setting up a different CAPTCHA in each */
+    Array.prototype.forEach.call(document.getElementsByClassName("captcheck_container"), function (container) {
         var xhr = new XMLHttpRequest();
-        xhr.open('GET', url, true);
+        xhr.open('GET', api_url + "?action=new", true);
         xhr.onreadystatechange = function () {
             if (this.readyState == 4) {
-                callback(this.status, this.responseText);
-            }
-        };
-        xhr.send();
-    };
-    getJSON(api_url + "?action=new", function (status, json) {
-        /* Add custom styles */
-        var styles = document.createElement('style');
-        /* Remove newlines/comments from captcheck.css and put it here */
-        styles.innerHTML = ".captcheck_box {font-family: Ubuntu, Arial, sans-serif; color: black; border: 1px solid #e0e0e0; border-radius: 3px; display: inline-block; padding: 3px; margin: 5px 2px 5px 1px; background-color: #f5f5f5;} .captcheck_label_message, .captcheck_label_message b {color: black; font-family: Ubuntu, Arial, sans-serif;} .captcheck_answer_label > input {visibility: hidden; position: absolute;} .captcheck_answer_label > input + img {cursor: pointer; border: 2px solid transparent; border-radius: 3px; min-width: 32px; width: 18%; max-width: 64px;} .captcheck_answer_label > input:checked + img {cursor: pointer; border: 2px solid #424242; border-radius: 3px;} .captcheck_error_message {color: red;}";
-        document.body.appendChild(styles);
+                var status = this.status;
+                var json = this.responseText;
+                /* Create captcha div */
+                var captcha = document.createElement("div");
+                captcha.setAttribute("class", "captcheck_box");
+                container.appendChild(captcha);
 
-        /* Get captcha container div */
-        var container = document.getElementById("captcheck_container");
-        /* Create captcha div */
-        var captcha = document.createElement("div");
-        captcha.setAttribute("class", "captcheck_box");
-        container.appendChild(captcha);
-        
-        if (status == 200) {
-            var data = JSON.parse(json);
-            /* Create answer buttons */
-            var answers = "";
-            for (var i = 0, len = data.answers.length; i < len; i++) {
-                var src = api_url + "?action=img&s=" + data.session + "&c=" + data.answers[i];
-                answers += "<span class='captcheck_answer_label' onclick='chooseAnswer(\"" + data.answers[i] + "\")'><input id='captcheck_answer_" + data.answers[i] + "' type='radio' name='captcheck_selected_answer' value='" + data.answers[i] + "' /><img src='" + src + "' /></span>";
-            }
-            var answer_div = document.createElement("div");
-            answer_div.innerHTML = answers;
-            /* Create question */
-            var question_div = document.createElement("div");
-            question_div.setAttribute("class", "captcheck_label_message");
-            question_div.innerHTML = "Click on the <b>" + data.question + "</b>:";
+                if (status == 200) {
+                    var data = JSON.parse(json);
+                    // ID prefix to use for this instance
+                    var idp = data.id_prefix;
+                    /* Create answer buttons */
+                    var answers = "<div class='captcheck_answer_images' id='captcheck_" + idp + "_answer_images'>";
+                    for (var i = 0, len = data.answers.length; i < len; i++) {
+                        var src = api_url + "?action=img&s=" + data.session + "&c=" + data.answers[i];
+                        answers += "<a class='captcheck_answer_label' href='' tabindex='0' onClick='chooseAnswer(\"" + idp + "\",\"" + data.answers[i] + "\"); return false;' onEnter='chooseAnswer(\"" + idp + "\",\"" + data.answers[i] + "\"); return false;'><input id='captcheck_" + idp + "_answer_" + data.answers[i] + "' type='radio' name='captcheck_selected_answer' value='" + data.answers[i] + "' /><img src='" + src + "' /></a>";
+                    }
+                    answers += "</div>";
+                    var answer_div = document.createElement("div");
+                    answer_div.innerHTML = answers + "<div class='captcheck_answer_access' id='captcheck_" + idp + "_answer_access'></div>";
+                    /* Create question */
+                    var question_div = document.createElement("div");
+                    question_div.setAttribute("class", "captcheck_label_message");
+                    question_div.setAttribute("id", "captcheck_" + idp + "_label_message")
+                    question_div.innerHTML = "<span class='captcheck_question_image' id='captcheck_" + idp + "_question_image'>" + data.question_i + "</span><span class='captcheck_question_access' id='captcheck_" + idp + "_question_access'>" + data.question_a + "</span><a href='' class='captcheck_alt_question_button' onClick='switchMode(\"" + idp + "\"); return false;' onEnter='switchMode(\"" + idp + "\"); return false;' id='captcheck_" + idp + "_alt_question_button' aria-label='Switch between image and text question' tabindex='0'>&gt; Text mode</a>";
 
-            /* Add question and answers */
-            captcha.appendChild(question_div);
-            captcha.appendChild(answer_div);
+                    /* Add question and answers */
+                    captcha.appendChild(question_div);
+                    captcha.appendChild(answer_div);
 
-            /* Add hidden session ID element */
-            var skey_input = document.createElement("span");
-            skey_input.innerHTML = "<input type='hidden' name='captcheck_session_code' value='" + data.session + "' />";
-            captcha.appendChild(skey_input);
-        } else {
-            /* Add error message */
-            captcha.innerHTML = "<span class='captcheck_error_message'>There was a problem loading the CAPTCHA.</span>";
-        }
+                    /* Add hidden session ID element */
+                    var skey_input = document.createElement("span");
+                    skey_input.innerHTML = "<input type='hidden' name='captcheck_session_code' value='" + data.session + "' />";
+                    captcha.appendChild(skey_input);
+                } else {
+                    /* Add error message */
+                    captcha.innerHTML = "<span class='captcheck_error_message'>There was a problem loading the CAPTCHA.</span>";
+                }
+            }
+        };
+        xhr.send();
     });
 }
 
-function chooseAnswer(ans) {
-    var box = document.getElementById("captcheck_answer_" + ans);
+function chooseAnswer(idp, ans) {
+    var box = document.getElementById("captcheck_" + idp + "_answer_" + ans);
     box.checked = true;
+    return false;
+}
+
+function switchMode(idp) {
+    var switch_label = document.getElementById("captcheck_" + idp + "_alt_question_button");
+    var img_q = document.getElementById("captcheck_" + idp + "_question_image");
+    var acc_q = document.getElementById("captcheck_" + idp + "_question_access");
+    var img_a = document.getElementById("captcheck_" + idp + "_answer_images");
+    var acc_a = document.getElementById("captcheck_" + idp + "_answer_access");
+    if (switch_label.innerHTML == "&gt; Text mode") {
+        switch_label.innerHTML = "&gt; Image mode";
+        img_q.style.display = "none";
+        acc_q.style.display = "initial";
+        img_a.style.display = "none";
+        acc_a.style.display = "initial";
+        acc_a.innerHTML = "<input type='text' name='captcheck_selected_answer' aria-label='Type your answer here.' autocomplete='off' autofill='off'/>";
+    } else {
+        switch_label.innerHTML = "&gt; Text mode";
+        img_q.style.display = "initial";
+        acc_q.style.display = "none";
+        img_a.style.display = "initial";
+        acc_a.style.display = "none";
+        acc_a.innerHTML = "";
+    }
 }

readme.md

@@ -8,8 +8,8 @@ IE9+.  Uses icons from Font-Awesome.
 How to use
 ----------
 
-In your form, put an empty div with the ID "captcheck_container". 
-Add `captcheck.js` into your page.
+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>
@@ -22,7 +22,7 @@ Add `captcheck.js` into your page.
         <body>
             <form action="submit.php">
                 <input type="text" name="form_field" placeholder="Some random form field" />
-                <div id="captcheck_container">
+                <div class="captcheck_container">
                 </div>
                 <button type="submit">Submit Form</button>
             </form>
@@ -65,7 +65,7 @@ Execution Flow
     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
+    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 scrambled answer
+    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

test.html

@@ -7,9 +7,9 @@
         <script src="captcheck.js"></script>
     </head>
     <body>
-        <form action="submit.php" method="POST">
+        <form action="test.php" method="POST">
             <input type="text" name="form_field" placeholder="Some random form field" />
-            <div id="captcheck_container">
+            <div class="captcheck_container">
             </div>
             <button type="submit">Submit Form</button>
         </form>