| 1 |
747 |
jeremybenn |
// Copyright 2011 The Go Authors. All rights reserved.
|
| 2 |
|
|
// Use of this source code is governed by a BSD-style
|
| 3 |
|
|
// license that can be found in the LICENSE file.
|
| 4 |
|
|
|
| 5 |
|
|
package template
|
| 6 |
|
|
|
| 7 |
|
|
import (
|
| 8 |
|
|
"strings"
|
| 9 |
|
|
)
|
| 10 |
|
|
|
| 11 |
|
|
// attrTypeMap[n] describes the value of the given attribute.
|
| 12 |
|
|
// If an attribute affects (or can mask) the encoding or interpretation of
|
| 13 |
|
|
// other content, or affects the contents, idempotency, or credentials of a
|
| 14 |
|
|
// network message, then the value in this map is contentTypeUnsafe.
|
| 15 |
|
|
// This map is derived from HTML5, specifically
|
| 16 |
|
|
// http://www.w3.org/TR/html5/Overview.html#attributes-1
|
| 17 |
|
|
// as well as "%URI"-typed attributes from
|
| 18 |
|
|
// http://www.w3.org/TR/html4/index/attributes.html
|
| 19 |
|
|
var attrTypeMap = map[string]contentType{
|
| 20 |
|
|
"accept": contentTypePlain,
|
| 21 |
|
|
"accept-charset": contentTypeUnsafe,
|
| 22 |
|
|
"action": contentTypeURL,
|
| 23 |
|
|
"alt": contentTypePlain,
|
| 24 |
|
|
"archive": contentTypeURL,
|
| 25 |
|
|
"async": contentTypeUnsafe,
|
| 26 |
|
|
"autocomplete": contentTypePlain,
|
| 27 |
|
|
"autofocus": contentTypePlain,
|
| 28 |
|
|
"autoplay": contentTypePlain,
|
| 29 |
|
|
"background": contentTypeURL,
|
| 30 |
|
|
"border": contentTypePlain,
|
| 31 |
|
|
"checked": contentTypePlain,
|
| 32 |
|
|
"cite": contentTypeURL,
|
| 33 |
|
|
"challenge": contentTypeUnsafe,
|
| 34 |
|
|
"charset": contentTypeUnsafe,
|
| 35 |
|
|
"class": contentTypePlain,
|
| 36 |
|
|
"classid": contentTypeURL,
|
| 37 |
|
|
"codebase": contentTypeURL,
|
| 38 |
|
|
"cols": contentTypePlain,
|
| 39 |
|
|
"colspan": contentTypePlain,
|
| 40 |
|
|
"content": contentTypeUnsafe,
|
| 41 |
|
|
"contenteditable": contentTypePlain,
|
| 42 |
|
|
"contextmenu": contentTypePlain,
|
| 43 |
|
|
"controls": contentTypePlain,
|
| 44 |
|
|
"coords": contentTypePlain,
|
| 45 |
|
|
"crossorigin": contentTypeUnsafe,
|
| 46 |
|
|
"data": contentTypeURL,
|
| 47 |
|
|
"datetime": contentTypePlain,
|
| 48 |
|
|
"default": contentTypePlain,
|
| 49 |
|
|
"defer": contentTypeUnsafe,
|
| 50 |
|
|
"dir": contentTypePlain,
|
| 51 |
|
|
"dirname": contentTypePlain,
|
| 52 |
|
|
"disabled": contentTypePlain,
|
| 53 |
|
|
"draggable": contentTypePlain,
|
| 54 |
|
|
"dropzone": contentTypePlain,
|
| 55 |
|
|
"enctype": contentTypeUnsafe,
|
| 56 |
|
|
"for": contentTypePlain,
|
| 57 |
|
|
"form": contentTypeUnsafe,
|
| 58 |
|
|
"formaction": contentTypeURL,
|
| 59 |
|
|
"formenctype": contentTypeUnsafe,
|
| 60 |
|
|
"formmethod": contentTypeUnsafe,
|
| 61 |
|
|
"formnovalidate": contentTypeUnsafe,
|
| 62 |
|
|
"formtarget": contentTypePlain,
|
| 63 |
|
|
"headers": contentTypePlain,
|
| 64 |
|
|
"height": contentTypePlain,
|
| 65 |
|
|
"hidden": contentTypePlain,
|
| 66 |
|
|
"high": contentTypePlain,
|
| 67 |
|
|
"href": contentTypeURL,
|
| 68 |
|
|
"hreflang": contentTypePlain,
|
| 69 |
|
|
"http-equiv": contentTypeUnsafe,
|
| 70 |
|
|
"icon": contentTypeURL,
|
| 71 |
|
|
"id": contentTypePlain,
|
| 72 |
|
|
"ismap": contentTypePlain,
|
| 73 |
|
|
"keytype": contentTypeUnsafe,
|
| 74 |
|
|
"kind": contentTypePlain,
|
| 75 |
|
|
"label": contentTypePlain,
|
| 76 |
|
|
"lang": contentTypePlain,
|
| 77 |
|
|
"language": contentTypeUnsafe,
|
| 78 |
|
|
"list": contentTypePlain,
|
| 79 |
|
|
"longdesc": contentTypeURL,
|
| 80 |
|
|
"loop": contentTypePlain,
|
| 81 |
|
|
"low": contentTypePlain,
|
| 82 |
|
|
"manifest": contentTypeURL,
|
| 83 |
|
|
"max": contentTypePlain,
|
| 84 |
|
|
"maxlength": contentTypePlain,
|
| 85 |
|
|
"media": contentTypePlain,
|
| 86 |
|
|
"mediagroup": contentTypePlain,
|
| 87 |
|
|
"method": contentTypeUnsafe,
|
| 88 |
|
|
"min": contentTypePlain,
|
| 89 |
|
|
"multiple": contentTypePlain,
|
| 90 |
|
|
"name": contentTypePlain,
|
| 91 |
|
|
"novalidate": contentTypeUnsafe,
|
| 92 |
|
|
// Skip handler names from
|
| 93 |
|
|
// http://www.w3.org/TR/html5/Overview.html#event-handlers-on-elements-document-objects-and-window-objects
|
| 94 |
|
|
// since we have special handling in attrType.
|
| 95 |
|
|
"open": contentTypePlain,
|
| 96 |
|
|
"optimum": contentTypePlain,
|
| 97 |
|
|
"pattern": contentTypeUnsafe,
|
| 98 |
|
|
"placeholder": contentTypePlain,
|
| 99 |
|
|
"poster": contentTypeURL,
|
| 100 |
|
|
"profile": contentTypeURL,
|
| 101 |
|
|
"preload": contentTypePlain,
|
| 102 |
|
|
"pubdate": contentTypePlain,
|
| 103 |
|
|
"radiogroup": contentTypePlain,
|
| 104 |
|
|
"readonly": contentTypePlain,
|
| 105 |
|
|
"rel": contentTypeUnsafe,
|
| 106 |
|
|
"required": contentTypePlain,
|
| 107 |
|
|
"reversed": contentTypePlain,
|
| 108 |
|
|
"rows": contentTypePlain,
|
| 109 |
|
|
"rowspan": contentTypePlain,
|
| 110 |
|
|
"sandbox": contentTypeUnsafe,
|
| 111 |
|
|
"spellcheck": contentTypePlain,
|
| 112 |
|
|
"scope": contentTypePlain,
|
| 113 |
|
|
"scoped": contentTypePlain,
|
| 114 |
|
|
"seamless": contentTypePlain,
|
| 115 |
|
|
"selected": contentTypePlain,
|
| 116 |
|
|
"shape": contentTypePlain,
|
| 117 |
|
|
"size": contentTypePlain,
|
| 118 |
|
|
"sizes": contentTypePlain,
|
| 119 |
|
|
"span": contentTypePlain,
|
| 120 |
|
|
"src": contentTypeURL,
|
| 121 |
|
|
"srcdoc": contentTypeHTML,
|
| 122 |
|
|
"srclang": contentTypePlain,
|
| 123 |
|
|
"start": contentTypePlain,
|
| 124 |
|
|
"step": contentTypePlain,
|
| 125 |
|
|
"style": contentTypeCSS,
|
| 126 |
|
|
"tabindex": contentTypePlain,
|
| 127 |
|
|
"target": contentTypePlain,
|
| 128 |
|
|
"title": contentTypePlain,
|
| 129 |
|
|
"type": contentTypeUnsafe,
|
| 130 |
|
|
"usemap": contentTypeURL,
|
| 131 |
|
|
"value": contentTypeUnsafe,
|
| 132 |
|
|
"width": contentTypePlain,
|
| 133 |
|
|
"wrap": contentTypePlain,
|
| 134 |
|
|
"xmlns": contentTypeURL,
|
| 135 |
|
|
}
|
| 136 |
|
|
|
| 137 |
|
|
// attrType returns a conservative (upper-bound on authority) guess at the
|
| 138 |
|
|
// type of the named attribute.
|
| 139 |
|
|
func attrType(name string) contentType {
|
| 140 |
|
|
name = strings.ToLower(name)
|
| 141 |
|
|
if strings.HasPrefix(name, "data-") {
|
| 142 |
|
|
// Strip data- so that custom attribute heuristics below are
|
| 143 |
|
|
// widely applied.
|
| 144 |
|
|
// Treat data-action as URL below.
|
| 145 |
|
|
name = name[5:]
|
| 146 |
|
|
} else if colon := strings.IndexRune(name, ':'); colon != -1 {
|
| 147 |
|
|
if name[:colon] == "xmlns" {
|
| 148 |
|
|
return contentTypeURL
|
| 149 |
|
|
}
|
| 150 |
|
|
// Treat svg:href and xlink:href as href below.
|
| 151 |
|
|
name = name[colon+1:]
|
| 152 |
|
|
}
|
| 153 |
|
|
if t, ok := attrTypeMap[name]; ok {
|
| 154 |
|
|
return t
|
| 155 |
|
|
}
|
| 156 |
|
|
// Treat partial event handler names as script.
|
| 157 |
|
|
if strings.HasPrefix(name, "on") {
|
| 158 |
|
|
return contentTypeJS
|
| 159 |
|
|
}
|
| 160 |
|
|
|
| 161 |
|
|
// Heuristics to prevent "javascript:..." injection in custom
|
| 162 |
|
|
// data attributes and custom attributes like g:tweetUrl.
|
| 163 |
|
|
// http://www.w3.org/TR/html5/elements.html#embedding-custom-non-visible-data-with-the-data-attributes:
|
| 164 |
|
|
// "Custom data attributes are intended to store custom data
|
| 165 |
|
|
// private to the page or application, for which there are no
|
| 166 |
|
|
// more appropriate attributes or elements."
|
| 167 |
|
|
// Developers seem to store URL content in data URLs that start
|
| 168 |
|
|
// or end with "URI" or "URL".
|
| 169 |
|
|
if strings.Contains(name, "src") ||
|
| 170 |
|
|
strings.Contains(name, "uri") ||
|
| 171 |
|
|
strings.Contains(name, "url") {
|
| 172 |
|
|
return contentTypeURL
|
| 173 |
|
|
}
|
| 174 |
|
|
return contentTypePlain
|
| 175 |
|
|
}
|
