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/*
* Copyright (C) 2022 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.safetycenter.lint
import android.os.Build
import android.os.Build.VERSION_CODES.TIRAMISU
import com.google.common.annotations.VisibleForTesting
import java.io.File
import java.io.InputStream
import java.lang.reflect.Modifier.isFinal
import java.lang.reflect.Modifier.isPublic
import java.lang.reflect.Modifier.isStatic
/** A class that allows interacting with files that are versioned by sdk. */
object FileSdk {
/**
* Linter constant to limit the mocked SDK levels that will be checked. We are making an
* important assumption here that if new parser logic is introduced that depends on a new SDK
* level, we expect a new schema to exist and a new version code to have been added.
*/
private val MAX_VERSION: Int = maxOf(getMaxVersionCodesConstant(), getMaxSchemaVersion())
/** Test only override to further limit the mocked SDK that will be checked in a test */
@VisibleForTesting @Volatile @JvmStatic var maxVersionOverride: Int? = null
/**
* Returns the max SDK level version that should be used while linting to check for backward
* compatibility.
*/
fun getMaxSdkVersion(): Int = maxVersionOverride ?: MAX_VERSION
/** Returns the SDK level version that a file resource belongs to. */
fun getSdkQualifier(file: File): Int {
val directParentName = file.parentFile.name
val lastQualifier = directParentName.substringAfterLast("-", "")
if (lastQualifier.isEmpty() || lastQualifier[0] != 'v') {
return TIRAMISU
}
return try {
lastQualifier.substring(1).toInt()
} catch (nfe: NumberFormatException) {
TIRAMISU
}
}
/** Returns the schema for the specific SDK level provided or null if it doesn't exist. */
fun getSchemaAsStream(sdk: Int): InputStream? =
FileSdk::class.java.getResourceAsStream("/safety_center_config${toQualifier(sdk)}.xsd")
private fun toQualifier(sdk: Int): String = if (sdk == TIRAMISU) "" else "-v$sdk"
private fun getMaxVersionCodesConstant(): Int =
Build.VERSION_CODES::class
.java
.declaredFields
.filter {
isPublic(it.modifiers) &&
isFinal(it.modifiers) &&
isStatic(it.modifiers) &&
it.type == Integer.TYPE
}
.maxOf { it.get(null) as Int }
private fun getMaxSchemaVersion(): Int =
// 99 is an arbitrary high value to look for the schema with the highest SDK level.
// Gaps are possible which is why we cannot just stop as soon as an SDK level has no schema.
(TIRAMISU..99).filter { getSchemaAsStream(it) != null }.maxOrNull() ?: 0
}
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