core/core/src/main/java/androidx/core/provider/FontProvider.java - platform/frameworks/support - Git at Google

 /*
  * Copyright 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 androidx.core.provider;

 import android.annotation.SuppressLint;
 import android.content.ContentResolver;
 import android.content.ContentUris;
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ProviderInfo;
 import android.content.pm.Signature;
 import android.content.res.Resources;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Build;
 import android.os.CancellationSignal;

 import androidx.annotation.DoNotInline;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.annotation.VisibleForTesting;
 import androidx.core.content.res.FontResourcesParserCompat;
 import androidx.core.provider.FontsContractCompat.FontFamilyResult;
 import androidx.core.provider.FontsContractCompat.FontInfo;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;

 class FontProvider {
  private FontProvider() {}

  @NonNull
  static FontFamilyResult getFontFamilyResult(@NonNull Context context,
  @NonNull FontRequest request, @Nullable CancellationSignal cancellationSignal)
  throws PackageManager.NameNotFoundException {
  ProviderInfo providerInfo = getProvider(
  context.getPackageManager(), request, context.getResources());
  if (providerInfo == null) {
  return FontFamilyResult.create(FontFamilyResult.STATUS_WRONG_CERTIFICATES, null);

  }
  FontInfo[] fonts = query(
  context, request, providerInfo.authority, cancellationSignal);
  return FontFamilyResult.create(FontFamilyResult.STATUS_OK, fonts);
  }

  /**
  * Do not access directly, visible for testing only.
  */
  @VisibleForTesting
  @Nullable
  static ProviderInfo getProvider(
  @NonNull PackageManager packageManager,
  @NonNull FontRequest request,
  @Nullable Resources resources
  )
  throws PackageManager.NameNotFoundException {
  String providerAuthority = request.getProviderAuthority();
  ProviderInfo info = packageManager.resolveContentProvider(providerAuthority, 0);
  if (info == null) {
  throw new PackageManager.NameNotFoundException("No package found for authority: "
  + providerAuthority);
  }

  if (!info.packageName.equals(request.getProviderPackage())) {
  throw new PackageManager.NameNotFoundException("Found content provider "
  + providerAuthority
  + ", but package was not " + request.getProviderPackage());
  }

  List<byte[]> signatures;
  // We correctly check all signatures returned, as advised in the lint error.
  @SuppressLint("PackageManagerGetSignatures")
  PackageInfo packageInfo = packageManager.getPackageInfo(info.packageName,
  PackageManager.GET_SIGNATURES);
  signatures = convertToByteArrayList(packageInfo.signatures);
  Collections.sort(signatures, sByteArrayComparator);
  List<List<byte[]>> requestCertificatesList = getCertificates(request, resources);
  for (int i = 0; i < requestCertificatesList.size(); ++i) {
  // Make a copy so we can sort it without modifying the incoming data.
  List<byte[]> requestSignatures = new ArrayList<>(requestCertificatesList.get(i));
  Collections.sort(requestSignatures, sByteArrayComparator);
  if (equalsByteArrayList(signatures, requestSignatures)) {
  return info;
  }
  }
  return null;
  }

  /**
  * Do not access directly, visible for testing only.
  */
  @VisibleForTesting
  @NonNull
  static FontInfo[] query(
  Context context,
  FontRequest request,
  String authority,
  CancellationSignal cancellationSignal
  ) {
  ArrayList<FontInfo> result = new ArrayList<>();
  final Uri uri = new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
  .authority(authority)
  .build();
  final Uri fileBaseUri = new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
  .authority(authority)
  .appendPath("file")
  .build();
  Cursor cursor = null;
  try {
  String[] projection = {
  FontsContractCompat.Columns._ID, FontsContractCompat.Columns.FILE_ID,
  FontsContractCompat.Columns.TTC_INDEX,
  FontsContractCompat.Columns.VARIATION_SETTINGS,
  FontsContractCompat.Columns.WEIGHT, FontsContractCompat.Columns.ITALIC,
  FontsContractCompat.Columns.RESULT_CODE};

  ContentResolver resolver = context.getContentResolver();
  if (Build.VERSION.SDK_INT > 16) {
  cursor = Api16Impl.query(resolver, uri, projection, "query = ?",
  new String[]{request.getQuery()}, null, cancellationSignal);
  } else {
  // No cancellation signal.
  cursor = resolver.query(uri, projection, "query = ?",
  new String[]{request.getQuery()}, null);
  }

  if (cursor != null && cursor.getCount() > 0) {
  final int resultCodeColumnIndex = cursor.getColumnIndex(
  FontsContractCompat.Columns.RESULT_CODE);
  result = new ArrayList<>();
  final int idColumnIndex = cursor.getColumnIndex(FontsContractCompat.Columns._ID);
  final int fileIdColumnIndex = cursor.getColumnIndex(
  FontsContractCompat.Columns.FILE_ID);
  final int ttcIndexColumnIndex = cursor.getColumnIndex(
  FontsContractCompat.Columns.TTC_INDEX);
  final int weightColumnIndex = cursor.getColumnIndex(
  FontsContractCompat.Columns.WEIGHT);
  final int italicColumnIndex = cursor.getColumnIndex(
  FontsContractCompat.Columns.ITALIC);
  while (cursor.moveToNext()) {
  int resultCode = resultCodeColumnIndex != -1
  ? cursor.getInt(resultCodeColumnIndex)
  : FontsContractCompat.Columns.RESULT_CODE_OK;
  final int ttcIndex = ttcIndexColumnIndex != -1
  ? cursor.getInt(ttcIndexColumnIndex) : 0;
  Uri fileUri;
  if (fileIdColumnIndex == -1) {
  long id = cursor.getLong(idColumnIndex);
  fileUri = ContentUris.withAppendedId(uri, id);
  } else {
  long id = cursor.getLong(fileIdColumnIndex);
  fileUri = ContentUris.withAppendedId(fileBaseUri, id);
  }

  int weight = weightColumnIndex != -1 ? cursor.getInt(weightColumnIndex) : 400;
  boolean italic = italicColumnIndex != -1 && cursor.getInt(italicColumnIndex)
  == 1;
  result.add(FontInfo.create(fileUri, ttcIndex, weight, italic, resultCode));
  }
  }
  } finally {
  if (cursor != null) {
  cursor.close();
  }
  }
  return result.toArray(new FontInfo[0]);
  }

  private static List<List<byte[]>> getCertificates(FontRequest request, Resources resources) {
  if (request.getCertificates() != null) {
  return request.getCertificates();
  }
  int resourceId = request.getCertificatesArrayResId();
  return FontResourcesParserCompat.readCerts(resources, resourceId);
  }

  private static final Comparator<byte[]> sByteArrayComparator = (l, r) -> {
  if (l.length != r.length) {
  return l.length - r.length;
  }
  for (int i = 0; i < l.length; ++i) {
  if (l[i] != r[i]) {
  return l[i] - r[i];
  }
  }
  return 0;
  };

  private static boolean equalsByteArrayList(List<byte[]> signatures,
  List<byte[]> requestSignatures) {
  if (signatures.size() != requestSignatures.size()) {
  return false;
  }
  for (int i = 0; i < signatures.size(); ++i) {
  if (!Arrays.equals(signatures.get(i), requestSignatures.get(i))) {
  return false;
  }
  }
  return true;
  }

  private static List<byte[]> convertToByteArrayList(Signature[] signatures) {
  List<byte[]> shaList = new ArrayList<>();
  for (Signature signature : signatures) {
  shaList.add(signature.toByteArray());
  }
  return shaList;
  }

  @RequiresApi(16)
  static class Api16Impl {
  private Api16Impl() {
  // This class is not instantiable.
  }

  @SuppressWarnings("SameParameterValue")
  @DoNotInline
  static Cursor query(ContentResolver contentResolver, Uri uri, String[] projection,
  String selection, String[] selectionArgs, String sortOrder,
  Object cancellationSignal) { // Avoid implicit NewApi cast for CancellationSignal
  return contentResolver.query(uri, projection, selection, selectionArgs, sortOrder,
  (CancellationSignal) cancellationSignal);
  }
  }
 }
	/*
	* Copyright 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 androidx.core.provider;

	import android.annotation.SuppressLint;
	import android.content.ContentResolver;
	import android.content.ContentUris;
	import android.content.Context;
	import android.content.pm.PackageInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.ProviderInfo;
	import android.content.pm.Signature;
	import android.content.res.Resources;
	import android.database.Cursor;
	import android.net.Uri;
	import android.os.Build;
	import android.os.CancellationSignal;

	import androidx.annotation.DoNotInline;
	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.annotation.RequiresApi;
	import androidx.annotation.VisibleForTesting;
	import androidx.core.content.res.FontResourcesParserCompat;
	import androidx.core.provider.FontsContractCompat.FontFamilyResult;
	import androidx.core.provider.FontsContractCompat.FontInfo;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.List;

	class FontProvider {
	private FontProvider() {}

	@NonNull
	static FontFamilyResult getFontFamilyResult(@NonNull Context context,
	@NonNull FontRequest request, @Nullable CancellationSignal cancellationSignal)
	throws PackageManager.NameNotFoundException {
	ProviderInfo providerInfo = getProvider(
	context.getPackageManager(), request, context.getResources());
	if (providerInfo == null) {
	return FontFamilyResult.create(FontFamilyResult.STATUS_WRONG_CERTIFICATES, null);

	}
	FontInfo[] fonts = query(
	context, request, providerInfo.authority, cancellationSignal);
	return FontFamilyResult.create(FontFamilyResult.STATUS_OK, fonts);
	}

	/**
	* Do not access directly, visible for testing only.
	*/
	@VisibleForTesting
	@Nullable
	static ProviderInfo getProvider(
	@NonNull PackageManager packageManager,
	@NonNull FontRequest request,
	@Nullable Resources resources
	)
	throws PackageManager.NameNotFoundException {
	String providerAuthority = request.getProviderAuthority();
	ProviderInfo info = packageManager.resolveContentProvider(providerAuthority, 0);
	if (info == null) {
	throw new PackageManager.NameNotFoundException("No package found for authority: "
	+ providerAuthority);
	}

	if (!info.packageName.equals(request.getProviderPackage())) {
	throw new PackageManager.NameNotFoundException("Found content provider "
	+ providerAuthority
	+ ", but package was not " + request.getProviderPackage());
	}

	List<byte[]> signatures;
	// We correctly check all signatures returned, as advised in the lint error.
	@SuppressLint("PackageManagerGetSignatures")
	PackageInfo packageInfo = packageManager.getPackageInfo(info.packageName,
	PackageManager.GET_SIGNATURES);
	signatures = convertToByteArrayList(packageInfo.signatures);
	Collections.sort(signatures, sByteArrayComparator);
	List<List<byte[]>> requestCertificatesList = getCertificates(request, resources);
	for (int i = 0; i < requestCertificatesList.size(); ++i) {
	// Make a copy so we can sort it without modifying the incoming data.
	List<byte[]> requestSignatures = new ArrayList<>(requestCertificatesList.get(i));
	Collections.sort(requestSignatures, sByteArrayComparator);
	if (equalsByteArrayList(signatures, requestSignatures)) {
	return info;
	}
	}
	return null;
	}

	/**
	* Do not access directly, visible for testing only.
	*/
	@VisibleForTesting
	@NonNull
	static FontInfo[] query(
	Context context,
	FontRequest request,
	String authority,
	CancellationSignal cancellationSignal
	) {
	ArrayList<FontInfo> result = new ArrayList<>();
	final Uri uri = new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
	.authority(authority)
	.build();
	final Uri fileBaseUri = new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
	.authority(authority)
	.appendPath("file")
	.build();
	Cursor cursor = null;
	try {
	String[] projection = {
	FontsContractCompat.Columns._ID, FontsContractCompat.Columns.FILE_ID,
	FontsContractCompat.Columns.TTC_INDEX,
	FontsContractCompat.Columns.VARIATION_SETTINGS,
	FontsContractCompat.Columns.WEIGHT, FontsContractCompat.Columns.ITALIC,
	FontsContractCompat.Columns.RESULT_CODE};

	ContentResolver resolver = context.getContentResolver();
	if (Build.VERSION.SDK_INT > 16) {
	cursor = Api16Impl.query(resolver, uri, projection, "query = ?",
	new String[]{request.getQuery()}, null, cancellationSignal);
	} else {
	// No cancellation signal.
	cursor = resolver.query(uri, projection, "query = ?",
	new String[]{request.getQuery()}, null);
	}

	if (cursor != null && cursor.getCount() > 0) {
	final int resultCodeColumnIndex = cursor.getColumnIndex(
	FontsContractCompat.Columns.RESULT_CODE);
	result = new ArrayList<>();
	final int idColumnIndex = cursor.getColumnIndex(FontsContractCompat.Columns._ID);
	final int fileIdColumnIndex = cursor.getColumnIndex(
	FontsContractCompat.Columns.FILE_ID);
	final int ttcIndexColumnIndex = cursor.getColumnIndex(
	FontsContractCompat.Columns.TTC_INDEX);
	final int weightColumnIndex = cursor.getColumnIndex(
	FontsContractCompat.Columns.WEIGHT);
	final int italicColumnIndex = cursor.getColumnIndex(
	FontsContractCompat.Columns.ITALIC);
	while (cursor.moveToNext()) {
	int resultCode = resultCodeColumnIndex != -1
	? cursor.getInt(resultCodeColumnIndex)
	: FontsContractCompat.Columns.RESULT_CODE_OK;
	final int ttcIndex = ttcIndexColumnIndex != -1
	? cursor.getInt(ttcIndexColumnIndex) : 0;
	Uri fileUri;
	if (fileIdColumnIndex == -1) {
	long id = cursor.getLong(idColumnIndex);
	fileUri = ContentUris.withAppendedId(uri, id);
	} else {
	long id = cursor.getLong(fileIdColumnIndex);
	fileUri = ContentUris.withAppendedId(fileBaseUri, id);
	}

	int weight = weightColumnIndex != -1 ? cursor.getInt(weightColumnIndex) : 400;
	boolean italic = italicColumnIndex != -1 && cursor.getInt(italicColumnIndex)
	== 1;
	result.add(FontInfo.create(fileUri, ttcIndex, weight, italic, resultCode));
	}
	}
	} finally {
	if (cursor != null) {
	cursor.close();
	}
	}
	return result.toArray(new FontInfo[0]);
	}

	private static List<List<byte[]>> getCertificates(FontRequest request, Resources resources) {
	if (request.getCertificates() != null) {
	return request.getCertificates();
	}
	int resourceId = request.getCertificatesArrayResId();
	return FontResourcesParserCompat.readCerts(resources, resourceId);
	}

	private static final Comparator<byte[]> sByteArrayComparator = (l, r) -> {
	if (l.length != r.length) {
	return l.length - r.length;
	}
	for (int i = 0; i < l.length; ++i) {
	if (l[i] != r[i]) {
	return l[i] - r[i];
	}
	}
	return 0;
	};

	private static boolean equalsByteArrayList(List<byte[]> signatures,
	List<byte[]> requestSignatures) {
	if (signatures.size() != requestSignatures.size()) {
	return false;
	}
	for (int i = 0; i < signatures.size(); ++i) {
	if (!Arrays.equals(signatures.get(i), requestSignatures.get(i))) {
	return false;
	}
	}
	return true;
	}

	private static List<byte[]> convertToByteArrayList(Signature[] signatures) {
	List<byte[]> shaList = new ArrayList<>();
	for (Signature signature : signatures) {
	shaList.add(signature.toByteArray());
	}
	return shaList;
	}

	@RequiresApi(16)
	static class Api16Impl {
	private Api16Impl() {
	// This class is not instantiable.
	}

	@SuppressWarnings("SameParameterValue")
	@DoNotInline
	static Cursor query(ContentResolver contentResolver, Uri uri, String[] projection,
	String selection, String[] selectionArgs, String sortOrder,
	Object cancellationSignal) { // Avoid implicit NewApi cast for CancellationSignal
	return contentResolver.query(uri, projection, selection, selectionArgs, sortOrder,
	(CancellationSignal) cancellationSignal);
	}
	}
	}