Move non-settings-specific logic to frameworks/base

The dialog that's shown when admin disables functionality lives in
frameworks/base. This change extracts common logic required there
into frameworks/base.

Bug: 188847063
Test: atest ParentalControlsUtilsTest
Change-Id: I9aa9f5664e04a226d2c30a72585bebeb8645494b

1 files changed, 73 insertions, 0 deletions

diff --git a/core/java/android/hardware/biometrics/ParentalControlsUtilsInternal.java b/core/java/android/hardware/biometrics/ParentalControlsUtilsInternal.java
new file mode 100644
index 000000000000..ef13ca6b6130
--- /dev/null
+++ b/core/java/android/hardware/biometrics/ParentalControlsUtilsInternal.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2021 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.hardware.biometrics;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.app.admin.DevicePolicyManager;
+import android.content.ComponentName;
+import android.os.UserHandle;
+
+/**
+ * "Base" functionality. For settings-specific functionality (which may rely on this base
+ * functionality), see {@link com.android.settings.biometrics.ParentalControlsUtils}
+ * @hide
+ */
+public class ParentalControlsUtilsInternal {
+
+    /**
+     * @return true if parental consent is required in order for biometric sensors to be used.
+     */
+    public static boolean parentConsentRequired(@NonNull DevicePolicyManager dpm,
+            @BiometricAuthenticator.Modality int modality, @NonNull UserHandle userHandle) {
+        final ComponentName cn = getSupervisionComponentName(dpm, userHandle);
+        if (cn == null) {
+            return false;
+        }
+
+        final int keyguardDisabledFeatures = dpm.getKeyguardDisabledFeatures(cn);
+        final boolean dpmFpDisabled = containsFlag(keyguardDisabledFeatures,
+                DevicePolicyManager.KEYGUARD_DISABLE_FINGERPRINT);
+        final boolean dpmFaceDisabled = containsFlag(keyguardDisabledFeatures,
+                DevicePolicyManager.KEYGUARD_DISABLE_FACE);
+        final boolean dpmIrisDisabled = containsFlag(keyguardDisabledFeatures,
+                DevicePolicyManager.KEYGUARD_DISABLE_IRIS);
+
+        final boolean consentRequired;
+        if (containsFlag(modality, BiometricAuthenticator.TYPE_FINGERPRINT) && dpmFpDisabled) {
+            consentRequired = true;
+        } else if (containsFlag(modality, BiometricAuthenticator.TYPE_FACE) && dpmFaceDisabled) {
+            consentRequired = true;
+        } else if (containsFlag(modality, BiometricAuthenticator.TYPE_IRIS) && dpmIrisDisabled) {
+            consentRequired = true;
+        } else {
+            consentRequired = false;
+        }
+
+        return consentRequired;
+    }
+
+    @Nullable
+    public static ComponentName getSupervisionComponentName(@NonNull DevicePolicyManager dpm,
+            @NonNull UserHandle userHandle) {
+        return dpm.getProfileOwnerOrDeviceOwnerSupervisionComponent(userHandle);
+    }
+
+    private static boolean containsFlag(int haystack, int needle) {
+        return (haystack & needle) != 0;
+    }
+}