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venv/Lib/site-packages/notebook/static/base/js/security.js

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+// 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;
+});