BBS ReCaptcha Fix (Script Breaking)

// ==UserScript==
// @name         BBS Captcha Fix iFrame
// @version      1.0
// @description  Fix the BBS's Recaptcha with an iframe, which breaks most other scripts
// @author       Degritone
// @match        *://dollars-bbs.org/*
// @grant        none
// @run-at       document-end
// ==/UserScript==


function replaceHTML(){
  let html = document.getElementsByTagName("html")[0].outerHTML
    .replace(`var self=`,`var nameWithoutCollision = `)
    .replace(`<script type="text/javascript" src="/random/kareha.js"></script>`,karehaUpdated)
    .replace(`<body class="mainpage">`,"")
    .replace(`</head>`,"")
    .replace("<head>",`<body class="mainpage">`)

  let iframe = document.createElement("iframe");
  iframe.style.cssText = `
    position:fixed;
    left:0px;
    right:0px;
    top:0px;
    bottom:0px;
    border:0px;
    width:100%;
    height:100%;
  `;

  document.body.innerHTML = "";
  document.body.appendChild(iframe);

  iframe.contentWindow.document.open();
  iframe.contentWindow.document.write("<!doctype html>"+html);
  iframe.contentWindow.document.close();
}

let karehaUpdated = `<script>function require_script_version(v)
{
    if(v!="3.a") alert("");
}


function show(id)
{
    var style=document.getElementById(id).style;
    if(style.display) style.display="";
    else style.display="none";
}

function insert(text,thread)
{
    var textarea=document.getElementById("postform"+thread).comment;
    if(textarea)
    {
        if(textarea.createTextRange && textarea.caretPos) // IE
        {
            var caretPos=textarea.caretPos;
            caretPos.text=caretPos.text.charAt(caretPos.text.length-1)==" "?text+" ":text;
        }
        else if(textarea.setSelectionRange) // Firefox
        {
            var start=textarea.selectionStart;
            var end=textarea.selectionEnd;
            textarea.value=textarea.value.substr(0,start)+text+textarea.value.substr(end);
            textarea.setSelectionRange(start+text.length,start+text.length);
        }
        else
        {
            textarea.value+=text+" ";
        }
        textarea.focus();
    }
}

function w_insert(text,link)
{
    if(document.body.className=="mainpage") document.location=link+"#i"+text;
    else insert(text,"");
}

function size_field(id,rows) { document.getElementById(id).comment.setAttribute("rows",rows); }

function submit_form(btn)
{
    btn.disabled = true;
    btn.value = "Please wait...";
    btn.form.submit();
}

function delete_post(thread,post,file)
{
    if(confirm("Are you sure you want to delete reply "+post+"?"))
    {
        var fileonly=false;
        var script=document.forms[0].action;
        var password=document.forms[0].password.value;

        if(file) fileonly=confirm("Leave the reply text and delete the only file?");

        document.location=script
        +"?task=delete"
        +"&delete="+thread+","+post
        +"&password="+password
        +"&fileonly="+(fileonly?"1":"0");
    }
}

function preview_post(formid,thread)
{
    var form=document.getElementById(formid);
    var preview=document.getElementById("preview"+thread);

    if(!form||!preview) return;

    preview.style.display="";
    preview.innerHTML="<em>Loading...</em>";

    var text;
    text="task=preview";
    text+="&comment="+encodeURIComponent(form.comment.value);
    text+="&markup="+encodeURIComponent(form.markup.value);
    if(thread) text+="&thread="+thread;

    var xmlhttp=get_xmlhttp();
    xmlhttp.open("POST",nameWithoutCollision);
    xmlhttp.onreadystatechange=function() {
        if(xmlhttp.readyState==4) preview.innerHTML=xmlhttp.responseText;
    }
    if(is_ie()||xmlhttp.setRequestHeader) xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    xmlhttp.send(text);
}

function get_xmlhttp()
{
    var xmlhttp;
    try { xmlhttp=new ActiveXObject("Msxml2.XMLHTTP"); }
    catch(e1)
    {
        try { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }
        catch(e1) { xmlhttp=null; }
    }

    if(!xmlhttp && typeof XMLHttpRequest!='undefined') xmlhttp=new XMLHttpRequest();

    return(xmlhttp);
}

function is_ie()
{
    return(document.all&&!document.opera);
}


function set_new_inputs(id)
{
    var el=document.getElementById(id);

    if(!el||!el.link) return;

    if(!el.field_a.value) el.field_a.value=get_cookie("name");
    if(!el.password.value) el.password.value=get_password("password");
    if(el.markup&&!el.comment.value) el.markup.value=get_cookie("markup");
    select_markup(el.markup);
}

function set_delpass(id)
{
    with(document.getElementById(id)) password.value=get_cookie("password");
}

function make_password()
{
    var chars="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    var pass='';

    for(var i=0;i<8;i++)
    {
        var rnd=Math.floor(Math.random()*chars.length);
        pass+=chars.substring(rnd,rnd+1);
    }

    return(pass);
}

function get_password(name)
{
    var pass=get_cookie(name);
    if(pass) return pass;
    return make_password();
}

function select_markup(sel)
{
    if(!window.markup_descriptions) return;

    var el=sel;
    while(el=el.nextSibling) if(el.nodeName.toLowerCase()=="small") break;

    if(el) el.innerHTML=markup_descriptions[sel.value];
}


function get_cookie(name)
{
    with(document.cookie)
    {
        var regexp=new RegExp("(^|;\\s+)"+name+"=(.*?)(;|$)");
        var hit=regexp.exec(document.cookie);
        if(hit&&hit.length>2) return unescape(hit[2]);
        else return '';
    }
};

function set_cookie(name,value,days)
{
    if(days)
    {
        var date=new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires="; expires="+date.toGMTString();
    }
    else expires="";
    document.cookie=name+"="+value+expires+"; path=/";
}

function set_stylesheet(styletitle)
{
    var links=document.getElementsByTagName("link");
    var found=false;
    for(var i=0;i<links.length;i++)
    {
        var rel=links[i].getAttribute("rel");
        var title=links[i].getAttribute("title");
        if(rel.indexOf("style")!=-1&&title)
        {
            links[i].disabled=true; // IE needs this to work. IE needs to die.
            if(styletitle==title) { links[i].disabled=false; found=true; }
        }
    }
    if(!found) set_preferred_stylesheet();
}

function set_preferred_stylesheet()
{
    var links=document.getElementsByTagName("link");
    for(var i=0;i<links.length;i++)
    {
        var rel=links[i].getAttribute("rel");
        var title=links[i].getAttribute("title");
        if(rel.indexOf("style")!=-1&&title) links[i].disabled=(rel.indexOf("alt")!=-1);
    }
}

function get_active_stylesheet()
{
    var links=document.getElementsByTagName("link");
    for(var i=0;i<links.length;i++)
    {
        var rel=links[i].getAttribute("rel");
        var title=links[i].getAttribute("title");
        if(rel.indexOf("style")!=-1&&title&&!links[i].disabled) return title;
    }
}

function get_preferred_stylesheet()
{
    var links=document.getElementsByTagName("link");
    for(var i=0;i<links.length;i++)
    {
        var rel=links[i].getAttribute("rel");
        var title=links[i].getAttribute("title");
        if(rel.indexOf("style")!=-1&&rel.indexOf("alt")==-1&&title) return title;
    }
    return null;
}


window.onunload=function(e)
{
    if(style_cookie)
    {
        var title=get_active_stylesheet();
        set_cookie(style_cookie,title,365);
    }
}

window.onload=function(e)
{
    var inputs = document.getElementsByTagName("input");
  for (var i = 0; i < inputs.length; i++) {
    if (inputs[i].type.toLowerCase() === "submit") {
      inputs[i].disabled = false;
    }
  }
    if(match=/#i(.+)/.exec(document.location.toString()))
    if(!document.getElementById("postform").comment.value)
    insert(unescape(match[1]),"");
}

if(style_cookie)
{
    var cookie=get_cookie(style_cookie);
    var title=cookie?cookie:get_preferred_stylesheet();
    set_stylesheet(title);
}

var captcha_key=make_password();</script>`

replaceHTML();