react app

react-app/node_modules/react/lib/dangerousStyleValue.js

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+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule dangerousStyleValue
+ * @typechecks static-only
+ */
+
+'use strict';
+
+var CSSProperty = require("./CSSProperty");
+
+var isUnitlessNumber = CSSProperty.isUnitlessNumber;
+
+/**
+ * Convert a value into the proper css writable value. The style name `name`
+ * should be logical (no hyphens), as specified
+ * in `CSSProperty.isUnitlessNumber`.
+ *
+ * @param {string} name CSS property name such as `topMargin`.
+ * @param {*} value CSS property value such as `10px`.
+ * @return {string} Normalized style value with dimensions applied.
+ */
+function dangerousStyleValue(name, value) {
+  // Note that we've removed escapeTextForBrowser() calls here since the
+  // whole string will be escaped when the attribute is injected into
+  // the markup. If you provide unsafe user data here they can inject
+  // arbitrary CSS which may be problematic (I couldn't repro this):
+  // https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet
+  // http://www.thespanner.co.uk/2007/11/26/ultimate-xss-css-injection/
+  // This is not an XSS hole but instead a potential CSS injection issue
+  // which has lead to a greater discussion about how we're going to
+  // trust URLs moving forward. See #2115901
+
+  var isEmpty = value == null || typeof value === 'boolean' || value === '';
+  if (isEmpty) {
+    return '';
+  }
+
+  var isNonNumeric = isNaN(value);
+  if (isNonNumeric || value === 0 ||
+      isUnitlessNumber.hasOwnProperty(name) && isUnitlessNumber[name]) {
+    return '' + value; // cast to string
+  }
+
+  if (typeof value === 'string') {
+    value = value.trim();
+  }
+  return value + 'px';
+}
+
+module.exports = dangerousStyleValue;