439 lines
16 KiB
Java
439 lines
16 KiB
Java
package app.grapheneos.pdfviewer;
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import android.content.pm.PackageInfo;
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import android.content.res.ColorStateList;
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import android.graphics.Color;
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import android.net.Uri;
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import android.os.Build;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.Gravity;
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import android.view.LayoutInflater;
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import android.view.Menu;
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import android.view.MenuInflater;
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import android.view.MenuItem;
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import android.view.View;
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import android.webkit.CookieManager;
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import android.webkit.JavascriptInterface;
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import android.webkit.WebResourceRequest;
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import android.webkit.WebResourceResponse;
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import android.webkit.WebSettings;
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import android.webkit.WebView;
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import android.webkit.WebViewClient;
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import android.widget.TextView;
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import android.widget.Toast;
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import androidx.annotation.NonNull;
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import androidx.annotation.RequiresApi;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.loader.app.LoaderManager;
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import androidx.loader.content.Loader;
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import app.grapheneos.pdfviewer.databinding.PdfviewerBinding;
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import app.grapheneos.pdfviewer.fragment.DocumentPropertiesFragment;
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import app.grapheneos.pdfviewer.fragment.JumpToPageFragment;
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import app.grapheneos.pdfviewer.loader.DocumentPropertiesLoader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.List;
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public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequence>> {
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public static final String TAG = "PdfViewer";
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private static final String KEY_PROPERTIES = "properties";
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private static final int MIN_WEBVIEW_RELEASE = 89;
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private static final String CONTENT_SECURITY_POLICY =
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"default-src 'none'; " +
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"form-action 'none'; " +
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"connect-src https://localhost/placeholder.pdf; " +
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"img-src blob: 'self'; " +
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"script-src 'self'; " +
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"style-src 'self'; " +
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"frame-ancestors 'none'; " +
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"base-uri 'none'";
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private static final String PERMISSIONS_POLICY =
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"accelerometer=(), " +
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"ambient-light-sensor=(), " +
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"autoplay=(), " +
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"battery=(), " +
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"camera=(), " +
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"clipboard-read=(), " +
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"clipboard-write=(), " +
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"display-capture=(), " +
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"document-domain=(), " +
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"encrypted-media=(), " +
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"fullscreen=(), " +
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"geolocation=(), " +
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"gyroscope=(), " +
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"hid=(), " +
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"idle-detection=(), " +
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"interest-cohort=(), " +
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"magnetometer=(), " +
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"microphone=(), " +
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"midi=(), " +
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"payment=(), " +
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"picture-in-picture=(), " +
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"publickey-credentials-get=(), " +
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"screen-wake-lock=(), " +
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"serial=(), " +
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"sync-xhr=(), " +
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"usb=(), " +
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"xr-spatial-tracking=()";
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private static final float MIN_ZOOM_RATIO = 0.5f;
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private static final float MAX_ZOOM_RATIO = 1.5f;
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private static final int ALPHA_LOW = 130;
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private static final int ALPHA_HIGH = 255;
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private static final int STATE_LOADED = 1;
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private static final int STATE_END = 2;
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private static final int PADDING = 10;
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public int mPage;
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public int mNumPages;
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private float mZoomRatio = 1f;
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private int mDocumentOrientationDegrees;
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private int mDocumentState;
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private List<CharSequence> mDocumentProperties;
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private InputStream mInputStream;
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private PdfviewerBinding binding;
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private TextView mTextView;
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private Toast mToast;
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AppCompatActivity activity;
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String fileName;
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Long fileSize;
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private class Channel {
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@JavascriptInterface
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public int getPage() {
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return mPage;
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}
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@JavascriptInterface
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public float getZoomRatio() {
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return mZoomRatio;
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}
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@JavascriptInterface
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public int getDocumentOrientationDegrees() {
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return mDocumentOrientationDegrees;
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}
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@JavascriptInterface
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public void setNumPages(int numPages) {
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mNumPages = numPages;
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activity.runOnUiThread(activity::invalidateOptionsMenu);
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}
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@JavascriptInterface
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public void setDocumentProperties(final String properties) {
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if (mDocumentProperties != null) {
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throw new SecurityException("mDocumentProperties not null");
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}
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final Bundle args = new Bundle();
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args.putString(KEY_PROPERTIES, properties);
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activity.runOnUiThread(() -> LoaderManager.getInstance(PdfViewer.this.activity).restartLoader(DocumentPropertiesLoader.ID, args, PdfViewer.this));
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}
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}
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public PdfViewer(@NonNull AppCompatActivity activity) {
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this.activity = activity;
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LayoutInflater inflater = activity.getLayoutInflater();
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binding = PdfviewerBinding.inflate(inflater);
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activity.setContentView(binding.getRoot());
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binding.webview.setBackgroundColor(Color.TRANSPARENT);
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if (BuildConfig.DEBUG) {
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WebView.setWebContentsDebuggingEnabled(true);
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}
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final WebSettings settings = binding.webview.getSettings();
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settings.setAllowContentAccess(false);
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settings.setAllowFileAccess(false);
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settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
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settings.setJavaScriptEnabled(true);
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CookieManager.getInstance().setAcceptCookie(false);
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binding.webview.addJavascriptInterface(new Channel(), "channel");
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binding.webview.setWebViewClient(new WebViewClient() {
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private WebResourceResponse fromAsset(final String mime, final String path) {
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try {
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InputStream inputStream = activity.getAssets().open(path.substring(1));
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return new WebResourceResponse(mime, null, inputStream);
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} catch (IOException e) {
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return null;
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}
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}
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@Override
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public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
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if (!"GET".equals(request.getMethod())) {
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return null;
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}
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final Uri url = request.getUrl();
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if (!"localhost".equals(url.getHost())) {
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return null;
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}
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final String path = url.getPath();
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Log.d(TAG, "path " + path);
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if ("/placeholder.pdf".equals(path)) {
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return new WebResourceResponse("application/pdf", null, mInputStream);
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}
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if ("/viewer.html".equals(path)) {
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final WebResourceResponse response = fromAsset("text/html", path);
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HashMap<String, String> headers = new HashMap<>();
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headers.put("Content-Security-Policy", CONTENT_SECURITY_POLICY);
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headers.put("Permissions-Policy", PERMISSIONS_POLICY);
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headers.put("X-Content-Type-Options", "nosniff");
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response.setResponseHeaders(headers);
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return response;
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}
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if ("/viewer.css".equals(path)) {
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return fromAsset("text/css", path);
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}
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if ("/viewer.js".equals(path) || "/pdf.js".equals(path) || "/pdf.worker.js".equals(path)) {
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return fromAsset("application/javascript", path);
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}
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return null;
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}
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@Override
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public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
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return true;
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}
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@Override
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public void onPageFinished(WebView view, String url) {
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mDocumentState = STATE_LOADED;
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activity.invalidateOptionsMenu();
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}
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});
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GestureHelper.attach(activity, binding.webview,
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new GestureHelper.GestureListener() {
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@Override
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public void onZoomIn(float value) {
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zoomIn(value, false);
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}
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@Override
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public void onZoomOut(float value) {
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zoomOut(value, false);
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}
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@Override
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public void onZoomEnd() {
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zoomEnd();
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}
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});
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mTextView = new TextView(activity);
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mTextView.setBackgroundColor(Color.DKGRAY);
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mTextView.setTextColor(ColorStateList.valueOf(Color.WHITE));
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mTextView.setTextSize(18);
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mTextView.setPadding(PADDING, 0, PADDING, 0);
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}
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public void onCreateOptionMenu(Menu menu) {
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MenuInflater inflater = activity.getMenuInflater();
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inflater.inflate(R.menu.pdf_viewer, menu);
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}
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public void onResume() {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
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// The user could have left the activity to update the WebView
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activity.invalidateOptionsMenu();
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if (getWebViewRelease() >= MIN_WEBVIEW_RELEASE) {
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binding.webviewOutOfDateLayout.setVisibility(View.GONE);
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binding.webview.setVisibility(View.VISIBLE);
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} else {
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binding.webview.setVisibility(View.GONE);
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binding.webviewOutOfDateMessage.setText(activity.getString(R.string.webview_out_of_date_message, getWebViewRelease(), MIN_WEBVIEW_RELEASE));
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binding.webviewOutOfDateLayout.setVisibility(View.VISIBLE);
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}
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}
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}
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@RequiresApi(api = Build.VERSION_CODES.O)
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private int getWebViewRelease() {
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PackageInfo webViewPackage = WebView.getCurrentWebViewPackage();
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String webViewVersionName = webViewPackage.versionName;
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return Integer.parseInt(webViewVersionName.substring(0, webViewVersionName.indexOf(".")));
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}
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@NonNull
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@Override
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public Loader<List<CharSequence>> onCreateLoader(int id, Bundle args) {
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return new DocumentPropertiesLoader(activity, args.getString(KEY_PROPERTIES), mNumPages, fileName, fileSize);
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}
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@Override
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public void onLoadFinished(@NonNull Loader<List<CharSequence>> loader, List<CharSequence> data) {
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mDocumentProperties = data;
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LoaderManager.getInstance(activity).destroyLoader(DocumentPropertiesLoader.ID);
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}
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@Override
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public void onLoaderReset(@NonNull Loader<List<CharSequence>> loader) {
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mDocumentProperties = null;
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}
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public void loadPdf(InputStream inputStream, String fileName, Long fileSize) {
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mPage = 1;
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mDocumentProperties = null;
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mInputStream = inputStream;
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this.fileName = fileName;
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this.fileSize = fileSize;
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binding.webview.loadUrl("https://localhost/viewer.html");
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activity.invalidateOptionsMenu();
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}
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private void renderPage(final int zoom) {
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binding.webview.evaluateJavascript("onRenderPage(" + zoom + ")", null);
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}
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private void documentOrientationChanged(final int orientationDegreesOffset) {
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mDocumentOrientationDegrees = (mDocumentOrientationDegrees + orientationDegreesOffset) % 360;
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if (mDocumentOrientationDegrees < 0) {
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mDocumentOrientationDegrees += 360;
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}
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renderPage(0);
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}
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private void zoomIn(float value, boolean end) {
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if (mZoomRatio < MAX_ZOOM_RATIO) {
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mZoomRatio = Math.min(mZoomRatio + value, MAX_ZOOM_RATIO);
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renderPage(end ? 1 : 2);
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activity.invalidateOptionsMenu();
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}
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}
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private void zoomOut(float value, boolean end) {
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if (mZoomRatio > MIN_ZOOM_RATIO) {
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mZoomRatio = Math.max(mZoomRatio - value, MIN_ZOOM_RATIO);
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renderPage(end ? 1 : 2);
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activity.invalidateOptionsMenu();
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}
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}
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private void zoomEnd() {
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renderPage(1);
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}
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private static void enableDisableMenuItem(MenuItem item, boolean enable) {
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if (enable) {
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item.setEnabled(true);
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item.getIcon().setAlpha(ALPHA_HIGH);
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} else {
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item.setEnabled(false);
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item.getIcon().setAlpha(ALPHA_LOW);
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}
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}
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public void onJumpToPageInDocument(final int selected_page) {
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if (selected_page >= 1 && selected_page <= mNumPages && mPage != selected_page) {
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mPage = selected_page;
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renderPage(0);
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showPageNumber();
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activity.invalidateOptionsMenu();
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}
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}
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private void showPageNumber() {
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if (mToast != null) {
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mToast.cancel();
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}
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mTextView.setText(String.format("%s/%s", mPage, mNumPages));
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mToast = new Toast(activity);
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mToast.setGravity(Gravity.BOTTOM | Gravity.END, PADDING, PADDING);
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mToast.setDuration(Toast.LENGTH_SHORT);
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mToast.setView(mTextView);
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mToast.show();
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}
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public boolean onPrepareOptionsMenu(Menu menu) {
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final int[] ids = { R.id.action_zoom_in, R.id.action_zoom_out, R.id.action_jump_to_page,
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R.id.action_next, R.id.action_previous, R.id.action_first, R.id.action_last,
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R.id.action_rotate_clockwise, R.id.action_rotate_counterclockwise,
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R.id.action_view_document_properties };
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if (mDocumentState < STATE_LOADED) {
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for (final int id : ids) {
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final MenuItem item = menu.findItem(id);
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if (item.isVisible()) {
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item.setVisible(false);
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}
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}
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} else if (mDocumentState == STATE_LOADED) {
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for (final int id : ids) {
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final MenuItem item = menu.findItem(id);
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if (!item.isVisible()) {
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item.setVisible(true);
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}
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}
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mDocumentState = STATE_END;
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}
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enableDisableMenuItem(menu.findItem(R.id.action_zoom_in), mZoomRatio != MAX_ZOOM_RATIO);
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enableDisableMenuItem(menu.findItem(R.id.action_zoom_out), mZoomRatio != MIN_ZOOM_RATIO);
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enableDisableMenuItem(menu.findItem(R.id.action_next), mPage < mNumPages);
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enableDisableMenuItem(menu.findItem(R.id.action_previous), mPage > 1);
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return true;
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}
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public boolean onOptionsItemSelected(MenuItem item) {
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final int itemId = item.getItemId();
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if (itemId == R.id.action_previous) {
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onJumpToPageInDocument(mPage - 1);
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return true;
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} else if (itemId == R.id.action_next) {
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onJumpToPageInDocument(mPage + 1);
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return true;
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} else if (itemId == R.id.action_first) {
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onJumpToPageInDocument(1);
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return true;
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} else if (itemId == R.id.action_last) {
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onJumpToPageInDocument(mNumPages);
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return true;
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} else if (itemId == R.id.action_zoom_out) {
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zoomOut(0.25f, true);
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return true;
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} else if (itemId == R.id.action_zoom_in) {
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zoomIn(0.25f, true);
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return true;
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} else if (itemId == R.id.action_rotate_clockwise) {
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documentOrientationChanged(90);
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return true;
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} else if (itemId == R.id.action_rotate_counterclockwise) {
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documentOrientationChanged(-90);
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return true;
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} else if (itemId == R.id.action_view_document_properties) {
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DocumentPropertiesFragment
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.newInstance(mDocumentProperties)
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.show(activity.getSupportFragmentManager(), DocumentPropertiesFragment.TAG);
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return true;
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} else if (itemId == R.id.action_jump_to_page) {
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JumpToPageFragment.newInstance(this)
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.show(activity.getSupportFragmentManager(), JumpToPageFragment.TAG);
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return true;
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}
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return false;
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}
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}
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