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/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.safehtml.shared;

/**
 * An object that implements this interface encapsulates a URI that is
 * guaranteed to be safe to use (with respect to potential Cross-Site-Scripting
 * vulnerabilities) in a URL context, for example in a URL-typed attribute in an
 * HTML document.
 *
 * 

* Note on usage: SafeUri should be used to ensure user input is not executed in * the browser. SafeUri should not be used to sanitize input before sending it * to the server: The server cannot rely on the type contract of SafeUri values * received from clients, because a malicious client could provide maliciously * crafted serialized forms of implementations of this type that violate the * type contract. * *

* All implementing classes must maintain the class invariant (by design and * implementation and/or convention of use), that invoking {@link #asString()} * on any instance will return a string that is safe to assign to a URL-typed * DOM or CSS property in a browser (or to use similarly in a "URL context"), in * the sense that doing so must not cause unintended execution of script in the * browser. * *

* In determining safety of a URL both the value itself as well as its * provenance matter. An arbitrary URI, including e.g. a * javascript: URI, can be deemed safe in the sense of this type's * contract if it is entirely under the program's control (e.g., a string * literal, {@see UriUtils#fromSafeConstant}). * *

* All implementations must implement equals() and hashCode() to behave * consistently with the result of asString().equals() and asString.hashCode(). * *

* Implementations must not return {@code null} from {@link #asString()}. * * @see UriUtils */ public interface SafeUri { /** * Returns this object's contained URI as a string. * *

* Based on this class' contract, the returned value will be non-null and a * string that is safe to use in a URL context. * * @return the contents as a String */ String asString(); /** * Compares this string to the specified object. Must be equal to * asString().equals(). * * @param anObject the object to compare to */ boolean equals(Object anObject); /** * Returns a hash code for this string. Must be equal to * asString().hashCode(). */ int hashCode(); }





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