/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net;
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/**
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* Describes specific properties of a requested network for use in a {@link NetworkRequest}.
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*
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* Applications cannot instantiate this class by themselves, but can obtain instances of
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* subclasses of this class via other APIs.
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*/
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public abstract class NetworkSpecifier {
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public NetworkSpecifier() {}
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/**
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* Returns true if a request with this {@link NetworkSpecifier} is satisfied by a network
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* with the given NetworkSpecifier.
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*
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* @hide
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*/
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public abstract boolean satisfiedBy(NetworkSpecifier other);
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/**
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* Optional method which can be overridden by concrete implementations of NetworkSpecifier to
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* check a self-reported UID. A concrete implementation may contain a UID which would be self-
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* reported by the caller (since NetworkSpecifier implementations should be non-mutable). This
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* function is called by ConnectivityService and is passed the actual UID of the caller -
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* allowing the verification of the self-reported UID. In cases of mismatch the implementation
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* should throw a SecurityException.
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*
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* @param requestorUid The UID of the requestor as obtained from its binder.
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*
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* @hide
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*/
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public void assertValidFromUid(int requestorUid) {
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// empty
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}
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/**
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* Optional method which can be overridden by concrete implementations of NetworkSpecifier to
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* perform any redaction of information from the NetworkSpecifier, e.g. if it contains
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* sensitive information. The default implementation simply returns the object itself - i.e.
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* no information is redacted. A concrete implementation may return a modified (copy) of the
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* NetworkSpecifier, or even return a null to fully remove all information.
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* <p>
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* This method is relevant to NetworkSpecifier objects used by agents - those are shared with
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* apps by default. Some agents may store sensitive matching information in the specifier,
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* e.g. a Wi-Fi SSID (which should not be shared since it may leak location). Those classes
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* can redact to a null. Other agents use the Network Specifier to share public information
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* with apps - those should not be redacted.
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* <p>
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* The default implementation redacts no information.
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*
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* @return A NetworkSpecifier object to be passed along to the requesting app.
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*
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* @hide
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*/
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public NetworkSpecifier redact() {
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// TODO (b/122160111): convert default to null once all platform NetworkSpecifiers
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// implement this method.
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return this;
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}
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}
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