mirror of
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299 lines
13 KiB
Java
299 lines
13 KiB
Java
package org.thoughtcrime.securesms.linkpreview;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.net.Uri;
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import androidx.annotation.NonNull;
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import android.text.Html;
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import android.text.TextUtils;
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import com.bumptech.glide.load.engine.DiskCacheStrategy;
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import com.bumptech.glide.request.FutureTarget;
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import org.thoughtcrime.securesms.ApplicationContext;
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import org.thoughtcrime.securesms.attachments.Attachment;
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import org.thoughtcrime.securesms.attachments.UriAttachment;
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import org.thoughtcrime.securesms.database.AttachmentDatabase;
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import org.thoughtcrime.securesms.dependencies.InjectableType;
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import org.thoughtcrime.securesms.giph.model.ChunkedImageUrl;
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import org.thoughtcrime.securesms.logging.Log;
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import org.thoughtcrime.securesms.mms.GlideApp;
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import org.thoughtcrime.securesms.net.CallRequestController;
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import org.thoughtcrime.securesms.net.CompositeRequestController;
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import org.thoughtcrime.securesms.net.ContentProxySafetyInterceptor;
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import org.thoughtcrime.securesms.net.RequestController;
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import org.thoughtcrime.securesms.providers.BlobProvider;
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import org.thoughtcrime.securesms.stickers.StickerRemoteUri;
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import org.thoughtcrime.securesms.stickers.StickerUrl;
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import org.thoughtcrime.securesms.util.Hex;
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import org.thoughtcrime.securesms.util.MediaUtil;
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import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
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import org.whispersystems.libsignal.InvalidMessageException;
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import org.whispersystems.libsignal.util.Pair;
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import org.whispersystems.libsignal.util.guava.Optional;
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import org.whispersystems.signalservice.api.SignalServiceMessageReceiver;
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import org.whispersystems.signalservice.api.messages.SignalServiceStickerManifest;
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import org.whispersystems.signalservice.api.messages.SignalServiceStickerManifest.StickerInfo;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.concurrent.CancellationException;
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import java.util.concurrent.ExecutionException;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import javax.inject.Inject;
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import okhttp3.CacheControl;
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import okhttp3.Call;
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import okhttp3.OkHttpClient;
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import okhttp3.Request;
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import okhttp3.Response;
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public class LinkPreviewRepository implements InjectableType {
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private static final String TAG = LinkPreviewRepository.class.getSimpleName();
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private static final CacheControl NO_CACHE = new CacheControl.Builder().noCache().build();
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private final OkHttpClient client;
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@Inject SignalServiceMessageReceiver messageReceiver;
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public LinkPreviewRepository(@NonNull Context context) {
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this.client = new OkHttpClient.Builder()
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// .proxySelector(new ContentProxySelector()) // Loki: Signal's proxy appears to have been banned by YouTube
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.addNetworkInterceptor(new ContentProxySafetyInterceptor())
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.cache(null)
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.build();
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ApplicationContext.getInstance(context).injectDependencies(this);
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}
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RequestController getLinkPreview(@NonNull Context context, @NonNull String url, @NonNull Callback<Optional<LinkPreview>> callback) {
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CompositeRequestController compositeController = new CompositeRequestController();
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if (!LinkPreviewUtil.isWhitelistedLinkUrl(url)) {
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Log.w(TAG, "Tried to get a link preview for a non-whitelisted domain.");
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callback.onComplete(Optional.absent());
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return compositeController;
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}
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RequestController metadataController;
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if (StickerUrl.isValidShareLink(url)) {
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metadataController = fetchStickerPackLinkPreview(context, url, callback);
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} else {
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metadataController = fetchMetadata(url, metadata -> {
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if (metadata.isEmpty()) {
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callback.onComplete(Optional.absent());
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return;
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}
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if (!metadata.getImageUrl().isPresent()) {
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callback.onComplete(Optional.of(new LinkPreview(url, metadata.getTitle().get(), Optional.absent())));
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return;
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}
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RequestController imageController = fetchThumbnail(context, metadata.getImageUrl().get(), attachment -> {
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if (!metadata.getTitle().isPresent() && !attachment.isPresent()) {
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callback.onComplete(Optional.absent());
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} else {
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callback.onComplete(Optional.of(new LinkPreview(url, metadata.getTitle().or(""), attachment)));
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}
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});
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compositeController.addController(imageController);
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});
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}
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compositeController.addController(metadataController);
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return compositeController;
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}
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private @NonNull RequestController fetchMetadata(@NonNull String url, Callback<Metadata> callback) {
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Call call = client.newCall(new Request.Builder().url(url).cacheControl(NO_CACHE).build());
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call.enqueue(new okhttp3.Callback() {
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@Override
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public void onFailure(@NonNull Call call, @NonNull IOException e) {
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Log.w(TAG, "Request failed.", e);
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callback.onComplete(Metadata.empty());
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}
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@Override
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public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
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if (!response.isSuccessful()) {
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Log.w(TAG, "Non-successful response. Code: " + response.code());
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callback.onComplete(Metadata.empty());
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return;
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} else if (response.body() == null) {
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Log.w(TAG, "No response body.");
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callback.onComplete(Metadata.empty());
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return;
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}
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String body = response.body().string();
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Optional<String> title = getProperty(body, "title");
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Optional<String> imageUrl = getProperty(body, "image");
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if (imageUrl.isPresent() && !LinkPreviewUtil.isWhitelistedMediaUrl(imageUrl.get())) {
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Log.i(TAG, "Image URL was invalid or for a non-whitelisted domain. Skipping.");
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imageUrl = Optional.absent();
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}
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callback.onComplete(new Metadata(title, imageUrl));
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}
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});
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return new CallRequestController(call);
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}
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private @NonNull RequestController fetchThumbnail(@NonNull Context context, @NonNull String imageUrl, @NonNull Callback<Optional<Attachment>> callback) {
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FutureTarget<Bitmap> bitmapFuture = GlideApp.with(context).asBitmap()
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.load(new ChunkedImageUrl(imageUrl))
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.skipMemoryCache(true)
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.diskCacheStrategy(DiskCacheStrategy.NONE)
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.centerInside()
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.submit(1024, 1024);
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RequestController controller = () -> bitmapFuture.cancel(false);
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SignalExecutors.UNBOUNDED.execute(() -> {
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try {
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Bitmap bitmap = bitmapFuture.get();
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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bitmap.compress(Bitmap.CompressFormat.JPEG, 80, baos);
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byte[] bytes = baos.toByteArray();
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Uri uri = BlobProvider.getInstance().forData(bytes).createForSingleSessionInMemory();
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Optional<Attachment> thumbnail = Optional.of(new UriAttachment(uri,
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uri,
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MediaUtil.IMAGE_JPEG,
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AttachmentDatabase.TRANSFER_PROGRESS_STARTED,
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bytes.length,
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bitmap.getWidth(),
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bitmap.getHeight(),
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null,
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null,
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false,
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false,
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null,
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null));
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callback.onComplete(thumbnail);
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} catch (CancellationException | ExecutionException | InterruptedException e) {
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controller.cancel();
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callback.onComplete(Optional.absent());
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} finally {
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bitmapFuture.cancel(false);
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}
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});
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return () -> bitmapFuture.cancel(true);
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}
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private @NonNull Optional<String> getProperty(@NonNull String searchText, @NonNull String property) {
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Pattern pattern = Pattern.compile("<\\s*meta\\s+property\\s*=\\s*\"\\s*og:" + property + "\\s*\"\\s+[^>]*content\\s*=\\s*\"(.*?)\"[^>]*/?\\s*>", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
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Matcher matcher = pattern.matcher(searchText);
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if (matcher.find()) {
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String text = Html.fromHtml(matcher.group(1)).toString();
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return TextUtils.isEmpty(text) ? Optional.absent() : Optional.of(text);
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}
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return Optional.absent();
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}
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private RequestController fetchStickerPackLinkPreview(@NonNull Context context,
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@NonNull String packUrl,
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@NonNull Callback<Optional<LinkPreview>> callback)
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{
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SignalExecutors.UNBOUNDED.execute(() -> {
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try {
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Pair<String, String> stickerParams = StickerUrl.parseShareLink(packUrl).or(new Pair<>("", ""));
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String packIdString = stickerParams.first();
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String packKeyString = stickerParams.second();
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byte[] packIdBytes = Hex.fromStringCondensed(packIdString);
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byte[] packKeyBytes = Hex.fromStringCondensed(packKeyString);
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SignalServiceStickerManifest manifest = messageReceiver.retrieveStickerManifest(packIdBytes, packKeyBytes);
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String title = manifest.getTitle().or(manifest.getAuthor()).or("");
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Optional<StickerInfo> firstSticker = Optional.fromNullable(manifest.getStickers().size() > 0 ? manifest.getStickers().get(0) : null);
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Optional<StickerInfo> cover = manifest.getCover().or(firstSticker);
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if (cover.isPresent()) {
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Bitmap bitmap = GlideApp.with(context).asBitmap()
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.load(new StickerRemoteUri(packIdString, packKeyString, cover.get().getId()))
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.skipMemoryCache(true)
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.diskCacheStrategy(DiskCacheStrategy.NONE)
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.centerInside()
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.submit(512, 512)
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.get();
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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bitmap.compress(Bitmap.CompressFormat.WEBP, 80, baos);
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byte[] bytes = baos.toByteArray();
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Uri uri = BlobProvider.getInstance().forData(bytes).createForSingleSessionInMemory();
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Optional<Attachment> thumbnail = Optional.of(new UriAttachment(uri,
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uri,
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MediaUtil.IMAGE_WEBP,
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AttachmentDatabase.TRANSFER_PROGRESS_STARTED,
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bytes.length,
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bitmap.getWidth(),
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bitmap.getHeight(),
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null,
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null,
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false,
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false,
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null,
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null));
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callback.onComplete(Optional.of(new LinkPreview(packUrl, title, thumbnail)));
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} else {
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callback.onComplete(Optional.absent());
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}
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} catch (IOException | InvalidMessageException | ExecutionException | InterruptedException e) {
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Log.w(TAG, "Failed to fetch sticker pack link preview.");
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callback.onComplete(Optional.absent());
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}
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});
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return () -> Log.i(TAG, "Cancelled sticker pack link preview fetch -- no effect.");
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}
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private static class Metadata {
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private final Optional<String> title;
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private final Optional<String> imageUrl;
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Metadata(Optional<String> title, Optional<String> imageUrl) {
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this.title = title;
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this.imageUrl = imageUrl;
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}
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static Metadata empty() {
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return new Metadata(Optional.absent(), Optional.absent());
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}
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Optional<String> getTitle() {
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return title;
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}
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Optional<String> getImageUrl() {
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return imageUrl;
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}
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boolean isEmpty() {
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return !title.isPresent() && !imageUrl.isPresent();
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}
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}
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interface Callback<T> {
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void onComplete(@NonNull T result);
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}
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}
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