ubiquity command: redirect-http

redirect_http.js

//////////////////////////////////////////////////////////////////////////////
//
// RedirectHttp
// 
// Note Ubiquity makes these objects available (the list is incomplete, but
// contains the objects that are used in this script):
//
// - Application:: the FUEL[http://developer.mozilla.org/en/FUEL] Application object
// - CmdUtils:: Ubiquity command utilities
//
//////////////////////////////////////////////////////////////////////////////

var RedirectHttp = {
  redirect: function(redirect_action) {
    // Get the document representing the current HTML page
    var objDocument = Application.activeWindow.activeTab.document;
    
    // Revert if forms have already been redirected
        var divs = objDocument.getElementsByTagName('div');
        for(i=0; i<divs.length; i++) {
            if (divs[i].getAttribute('id') == '__redirecthttp_header') {
                var execute_revert_script = objDocument.createElement("script"); 
                execute_revert_script.type = "text/javascript";
                execute_revert_script.innerHTML = "redirecthttp_revert_forms();"
                objDocument.getElementById('__redirecthttp_header').appendChild(execute_revert_script);
            }
        }
        
      var original_action_name = "__original_action";
      var redirect_label = "Redirecting HTTP Requests";
    var error_label = "Redirect HTTP Error";
    var error_message = "The webpage may have been corrupted; be sure to refresh.";
    
    // Add notifications
    var css_style = objDocument.createElement("style"); 
    css_style.type = 'text/css';
    css_style.rel = 'stylesheet';
    css_style.innerHTML = "" +
    ".__notification_div { position:relative;text-align:center;background-color:#EFE3BC;border: thin solid white;}" +
    "#__redirecthttp_header div.__redirecthttp_message { position:absolute;left:0; }" +
    ".__notification_div div.__redirecthttp_message { display:inline;font-weight:bold; }" +
    ".__notification_div form.__redirecthttp_url { display:inline; }" +
    ".__notification_div div.__redirecthttp_links { display:inline;position:absolute;right:0;font-size:0.8em;font-weight:normal;text-decoration:none; }";

    var header_div = objDocument.createElement("div"); 
    header_div.setAttribute("id", "__redirecthttp_header");
    header_div.setAttribute("class", "__notification_div");
    header_div.innerHTML = "" +
    "<div class='__redirecthttp_message'>" + redirect_label + "</div>" +
    "<form action='" + redirect_action + "' method='get' class='__redirecthttp_url'>" + 
    "<input type='text' name='" + original_action_name + "' value='" + objDocument.URL + "'>" +
    "<input type='submit' value='Send'>" +
    "</form>" +
    "<div class='__redirecthttp_links'>" + 
    "<a href='javascript:redirecthttp_revert_forms();'>close</a>" +
    "</div>";

    var footer_div = objDocument.createElement("div"); 
    footer_div.setAttribute("id", "__redirecthttp_footer");
    footer_div.setAttribute("class", "__notification_div");
    footer_div.innerHTML = "" +
    "<div class='__redirecthttp_message'>" + redirect_label + "</div>" +
    "<div class='__redirecthttp_links'>" + 
    "<a href='javascript:redirecthttp_revert_forms();'>close</a>" +
    "</div>";

    var revert_script = objDocument.createElement("script"); 
    revert_script.type = "text/javascript";
    revert_script.innerHTML =  "function redirecthttp_revert_forms() {" +
      "try {" +
        // remove notifications
        "document.body.removeChild( document.getElementById('__redirecthttp_header') );" +
        "document.body.removeChild( document.getElementById('__redirecthttp_footer') );" +

        // redirect forms back to original actions
        "var forms = document.getElementsByTagName('form');" +
        "for(i=0; i<forms.length; i++) {" +
        "var form = forms[i];" +
        "var form_index = form.getAttribute('__redirecthttp_form_index');" +
        "var original_action_input = document.getElementById('__redirecthttp_original_action_' + form_index);" +

        "form.setAttribute('action', original_action_input.value);" +
        "form.removeAttribute('__redirecthttp_form_index');" +
        "form.removeChild(original_action_input);" +
        //"alert(form.innerHTML);" +
      "}" +

      // redirect anchors back to original hrefs
      "var anchors = document.getElementsByTagName('a');" +
      "for(i=0; i<anchors.length; i++) {" +
        "var anchor = anchors[i];" +
        "anchor.setAttribute('href', anchor.getAttribute('__redirecthttp_original_href'));" +
        "anchor.removeAttribute('__redirecthttp_original_href');" +
      "}" +

      "} catch(ex) {" +
        "alert('" + error_label + ": ' + ex.message + \"\\n\\n\" + '" + error_message + "');" +
      "}" +
    "}";
    
    try {
        // redirect forms to the redirect_action
        var forms = objDocument.getElementsByTagName('form');
            for(i=0; i<forms.length; i++) {
              var form = forms[i];
              var original_action_input = objDocument.createElement("input"); 
              original_action_input.setAttribute("id", "__redirecthttp_original_action_" + i);
              original_action_input.setAttribute("name", original_action_name);
              original_action_input.setAttribute("type", "hidden");
              original_action_input.setAttribute("value", form.action);

              form.setAttribute("action", redirect_action);
              form.setAttribute("__redirecthttp_form_index", i);
              form.appendChild(original_action_input);
              //alert(form.innerHTML);
            }
            
            // redirect anchors to the redirect_action
            var anchors = objDocument.getElementsByTagName('a');
            for(i=0; i<anchors.length; i++) {
              var anchor = anchors[i];
              anchor.setAttribute("__redirecthttp_original_href", anchor.href);
              anchor.setAttribute("href", redirect_action + "?" + original_action_name + "=" + escape(anchor.href));
            }        
                
            // add notifications
            header_div.appendChild(revert_script);
        header_div.appendChild(css_style);
            objDocument.body.insertBefore(header_div, objDocument.body.firstChild)
            objDocument.body.appendChild(footer_div)
            
        } catch(ex) {
            displayMessage(error_label + ": " + ex.message + "\n\n" + error_message);
        }
  }
}

//////////////////////////////////////////////////////////////////////////////
//
// redirect_http command
//
//////////////////////////////////////////////////////////////////////////////

CmdUtils.CreateCommand({ 
  name: "redirect_http",
  author: { name: "Simon Chiang", email: "simon.a.chiang@gmail.com"},
  license: "MIT",
  description: "Redirects html forms to a custom url",
  help: "Redirect a page by typing 'redirect <new url>'.  Reset using the controls that appear on the page",
  takes: {"url": noun_arb_text},
  execute: function(url) {
    RedirectHttp.redirect(url.html);
  }
});