// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.

define([
    'jquery',
    'components/google-caja/html-css-sanitizer-minified',
], function($, sanitize) {
    "use strict";
    
    var noop = function (x) { return x; };
    
    var caja;
    if (window && window.html) {
        caja = window.html;
        caja.html4 = window.html4;
        caja.sanitizeStylesheet = window.sanitizeStylesheet;
    }
    
    var sanitizeAttribs = function (tagName, attribs, opt_naiveUriRewriter, opt_nmTokenPolicy, opt_logger) {
        /**
         * add trusting data-attributes to the default sanitizeAttribs from caja
         * this function is mostly copied from the caja source
         */
        var ATTRIBS = caja.html4.ATTRIBS;
        for (var i = 0; i < attribs.length; i += 2) {
            var attribName = attribs[i];
            if (attribName.substr(0,5) == 'data-') {
                var attribKey = '*::' + attribName;
                if (!ATTRIBS.hasOwnProperty(attribKey)) {
                    ATTRIBS[attribKey] = 0;
                }
            }
        }
        // Caja doesn't allow data uri for img::src, see
        // https://github.com/google/caja/issues/1558
        // This is not a security issue for browser post ie6 though, so we
        // disable the check
        // https://www.owasp.org/index.php/Script_in_IMG_tags
        ATTRIBS['img::src'] = 0;
        return caja.sanitizeAttribs(tagName, attribs, opt_naiveUriRewriter, opt_nmTokenPolicy, opt_logger);
    };
    
    var sanitize_css = function (css, tagPolicy) {
        /**
         * sanitize CSS
         * like sanitize_html, but for CSS
         * called by sanitize_stylesheets
         */
        return caja.sanitizeStylesheet(
            window.location.pathname,
            css,
            {
                containerClass: null,
                idSuffix: '',
                tagPolicy: tagPolicy,
                virtualizeAttrName: noop
            },
            noop
        );
    };
    
    var sanitize_stylesheets = function (html, tagPolicy) {
        /**
         * sanitize just the css in style tags in a block of html
         * called by sanitize_html, if allow_css is true
         */
        var h = $("<div/>").append(html);
        var style_tags = h.find("style");
        if (!style_tags.length) {
            // no style tags to sanitize
            return html;
        }
        style_tags.each(function(i, style) {
            style.innerHTML = sanitize_css(style.innerHTML, tagPolicy);
        });
        return h.html();
    };
    
    var sanitize_html = function (html, allow_css) {
        /**
         * sanitize HTML
         * if allow_css is true (default: false), CSS is sanitized as well.
         * otherwise, CSS elements and attributes are simply removed.
         */
        var html4 = caja.html4;

        if (allow_css) {
            // allow sanitization of style tags,
            // not just scrubbing
            html4.ELEMENTS.style &= ~html4.eflags.UNSAFE;
            html4.ATTRIBS.style = html4.atype.STYLE;
        } else {
            // scrub all CSS
            html4.ELEMENTS.style |= html4.eflags.UNSAFE;
            html4.ATTRIBS.style = html4.atype.SCRIPT;
        }
        
        var record_messages = function (msg, opts) {
            console.log("HTML Sanitizer", msg, opts);
        };
        
        var policy = function (tagName, attribs) {
            if (!(html4.ELEMENTS[tagName] & html4.eflags.UNSAFE)) {
                return {
                    'attribs': sanitizeAttribs(tagName, attribs,
                        noop, noop, record_messages)
                    };
            } else {
                record_messages(tagName + " removed", {
                  change: "removed",
                  tagName: tagName
                });
            }
        };
        
        var sanitized = caja.sanitizeWithPolicy(html, policy);
        
        if (allow_css) {
            // sanitize style tags as stylesheets
            sanitized = sanitize_stylesheets(sanitized, policy);
        }
        
        return sanitized;
    };

    var sanitize_html_and_parse = function (html, allow_css) {
        /**
         * Sanitize HTML and parse it safely using jQuery.
         *
         * This disable's jQuery's html 'prefilter', which can make invalid
         * HTML valid after the sanitizer has checked it.
         *
         * Returns an array of DOM nodes.
         */
        var sanitized_html = sanitize_html(html, allow_css);
        var prev_htmlPrefilter = $.htmlPrefilter;
        $.htmlPrefilter = function(html) {return html;};  // Don't modify HTML
        try {
            return $.parseHTML(sanitized_html);
        } finally {
            $.htmlPrefilter = prev_htmlPrefilter;  // Set it back again
        }
    };
    
    var security = {
        caja: caja,
        sanitize_html_and_parse: sanitize_html_and_parse,
        sanitize_html: sanitize_html
    };

    return security;
});