Use general-purpose resource provider.

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionModule.java

@@ -0,0 +1,17 @@
+package org.briarproject.bramble.plugin.tor;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class CircumventionModule {
+
+	@Provides
+	@Singleton
+	CircumventionProvider provideCircumventionProvider(
+			CircumventionProviderImpl provider) {
+		return provider;
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProviderImpl.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.plugin.tor;
 
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.system.ResourceProvider;
 
 import java.io.InputStream;
 import java.util.ArrayList;
@@ -10,10 +11,11 @@ import java.util.Scanner;
 import java.util.Set;
 
 import javax.annotation.Nullable;
+import javax.inject.Inject;
 
 import static java.util.Arrays.asList;
 
-abstract class CircumventionProviderImpl implements CircumventionProvider {
+class CircumventionProviderImpl implements CircumventionProvider {
 
 	private final static String BRIDGE_FILE_NAME = "bridges";
 
@@ -22,10 +24,15 @@ abstract class CircumventionProviderImpl implements CircumventionProvider {
 	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
 			new HashSet<>(asList(BRIDGES));
 
+	private final ResourceProvider resourceProvider;
+
 	@Nullable
 	private volatile List<String> bridges = null;
 
-	protected abstract InputStream getResourceInputStream(String name);
+	@Inject
+	CircumventionProviderImpl(ResourceProvider resourceProvider) {
+		this.resourceProvider = resourceProvider;
+	}
 
 	@Override
 	public boolean isTorProbablyBlocked(String countryCode) {
@@ -40,12 +47,14 @@ abstract class CircumventionProviderImpl implements CircumventionProvider {
 	@Override
 	@IoExecutor
 	public List<String> getBridges() {
-		if (this.bridges != null) return this.bridges;
+		List<String> bridges = this.bridges;
+		if (bridges != null) return new ArrayList<>(bridges);
 
-		InputStream is = getResourceInputStream(BRIDGE_FILE_NAME);
+		InputStream is =
+				resourceProvider.getResourceInputStream(BRIDGE_FILE_NAME);
 		Scanner scanner = new Scanner(is);
 
-		List<String> bridges = new ArrayList<>();
+		bridges = new ArrayList<>();
 		while (scanner.hasNextLine()) {
 			String line = scanner.nextLine();
 			if (!line.startsWith("#")) bridges.add(line);

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

@@ -26,6 +26,7 @@ import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.api.system.ResourceProvider;
 import org.briarproject.bramble.util.IoUtils;
 import org.briarproject.bramble.util.StringUtils;
 
@@ -97,6 +98,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final DuplexPluginCallback callback;
 	private final String architecture;
 	private final CircumventionProvider circumventionProvider;
+	private final ResourceProvider resourceProvider;
 	private final int maxLatency, maxIdleTime, socketTimeout;
 	private final File torDirectory, torFile, geoIpFile, configFile;
 	private final File doneFile, cookieFile;
@@ -113,23 +115,22 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	protected abstract long getLastUpdateTime();
 
-	protected abstract InputStream getResourceInputStream(String name);
-
 	TorPlugin(Executor ioExecutor, NetworkManager networkManager,
 			LocationUtils locationUtils, SocketFactory torSocketFactory,
-			Clock clock, CircumventionProvider circumventionProvider,
-			Backoff backoff, DuplexPluginCallback callback,
-			String architecture, int maxLatency, int maxIdleTime,
-			File torDirectory) {
+			Clock clock, ResourceProvider resourceProvider,
+			CircumventionProvider circumventionProvider, Backoff backoff,
+			DuplexPluginCallback callback, String architecture, int maxLatency,
+			int maxIdleTime, File torDirectory) {
 		this.ioExecutor = ioExecutor;
 		this.networkManager = networkManager;
 		this.locationUtils = locationUtils;
 		this.torSocketFactory = torSocketFactory;
 		this.clock = clock;
+		this.resourceProvider = resourceProvider;
+		this.circumventionProvider = circumventionProvider;
 		this.backoff = backoff;
 		this.callback = callback;
 		this.architecture = architecture;
-		this.circumventionProvider = circumventionProvider;
 		this.maxLatency = maxLatency;
 		this.maxIdleTime = maxIdleTime;
 		if (maxIdleTime > Integer.MAX_VALUE / 2)
@@ -285,21 +286,22 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private InputStream getTorInputStream() throws IOException {
 		if (LOG.isLoggable(INFO))
 			LOG.info("Installing Tor binary for " + architecture);
-		InputStream in = getResourceInputStream("tor_" + architecture);
+		InputStream in =
+				resourceProvider.getResourceInputStream("tor_" + architecture);
 		ZipInputStream zin = new ZipInputStream(in);
 		if (zin.getNextEntry() == null) throw new IOException();
 		return zin;
 	}
 
 	private InputStream getGeoIpInputStream() throws IOException {
-		InputStream in = getResourceInputStream("geoip");
+		InputStream in = resourceProvider.getResourceInputStream("geoip");
 		ZipInputStream zin = new ZipInputStream(in);
 		if (zin.getNextEntry() == null) throw new IOException();
 		return zin;
 	}
 
 	private InputStream getConfigInputStream() {
-		return getResourceInputStream("torrc");
+		return resourceProvider.getResourceInputStream("torrc");
 	}
 
 	private void tryToClose(@Nullable Closeable c) {