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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 android.content.integrity;
import static com.android.internal.util.Preconditions.checkArgument;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.os.Parcel;
import android.os.Parcelable;
import com.android.internal.annotations.VisibleForTesting;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Objects;
/**
* Represent rules to be used in the rule evaluation engine to match against app installs.
*
* <p>Instances of this class are immutable.
*
* @hide
*/
@SystemApi
@VisibleForTesting
public final class Rule implements Parcelable {
/** @hide */
@IntDef(
value = {
DENY,
FORCE_ALLOW,
})
@Retention(RetentionPolicy.SOURCE)
public @interface Effect {}
/** If this rule matches the install, the install should be denied. */
public static final int DENY = 0;
/**
* If this rule matches the install, the install will be allowed regardless of other matched
* rules.
*/
public static final int FORCE_ALLOW = 1;
private final @NonNull IntegrityFormula mFormula;
private final @Effect int mEffect;
public Rule(@NonNull IntegrityFormula formula, @Effect int effect) {
checkArgument(isValidEffect(effect), "Unknown effect: %d", effect);
this.mFormula = Objects.requireNonNull(formula);
this.mEffect = effect;
}
Rule(Parcel in) {
mFormula = IntegrityFormula.readFromParcel(in);
mEffect = in.readInt();
}
@NonNull
public static final Creator<Rule> CREATOR =
new Creator<Rule>() {
@Override
public Rule createFromParcel(Parcel in) {
return new Rule(in);
}
@Override
public Rule[] newArray(int size) {
return new Rule[size];
}
};
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
IntegrityFormula.writeToParcel(mFormula, dest, flags);
dest.writeInt(mEffect);
}
@NonNull
public IntegrityFormula getFormula() {
return mFormula;
}
public @Effect int getEffect() {
return mEffect;
}
@Override
public String toString() {
return String.format("Rule: %s, %s", mFormula, effectToString(mEffect));
}
@Override
public boolean equals(@Nullable Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Rule that = (Rule) o;
return mEffect == that.mEffect && Objects.equals(mFormula, that.mFormula);
}
@Override
public int hashCode() {
return Objects.hash(mFormula, mEffect);
}
private static String effectToString(int effect) {
switch (effect) {
case DENY:
return "DENY";
case FORCE_ALLOW:
return "FORCE_ALLOW";
default:
throw new IllegalArgumentException("Unknown effect " + effect);
}
}
private static boolean isValidEffect(int effect) {
return effect == DENY || effect == FORCE_ALLOW;
}
}
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