1 files changed, 123 insertions, 0 deletions
diff --git a/app/src/main/java/com/wireguard/android/preference/LogExporterPreference.java b/app/src/main/java/com/wireguard/android/preference/LogExporterPreference.java
new file mode 100644
index 00000000..d73c41bc
--- /dev/null
+++ b/app/src/main/java/com/wireguard/android/preference/LogExporterPreference.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright © 2018 Samuel Holland <samuel@sholland.org>
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.preference;
+
+import android.Manifest;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Environment;
+import android.support.design.widget.Snackbar;
+import android.support.v7.preference.Preference;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.ContextThemeWrapper;
+
+import com.wireguard.android.Application;
+import com.wireguard.android.R;
+import com.wireguard.android.activity.SettingsActivity;
+import com.wireguard.android.util.ExceptionLoggers;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * Preference implementing a button that asynchronously exports logs.
+ */
+
+public class LogExporterPreference extends Preference {
+    private static final String TAG = "WireGuard/" + LogExporterPreference.class.getSimpleName();
+
+    private String exportedFilePath;
+
+    public LogExporterPreference(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    private static SettingsActivity getPrefActivity(final Preference preference) {
+        final Context context = preference.getContext();
+        if (context instanceof ContextThemeWrapper) {
+            if (((ContextThemeWrapper) context).getBaseContext() instanceof SettingsActivity) {
+                return ((SettingsActivity) ((ContextThemeWrapper) context).getBaseContext());
+            }
+        }
+        return null;
+    }
+
+    private void exportLog() {
+        Application.getComponent().getAsyncWorker().supplyAsync(() -> {
+            final File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
+            final File file = new File(path, "wireguard-log.txt");
+            if (!path.isDirectory() && !path.mkdirs())
+                throw new IOException("Cannot create output directory");
+
+            /* We would like to simply run `builder.redirectOutput(file);`, but this is API 26.
+             * Instead we have to do this dance, since logcat appends.
+             */
+            new FileOutputStream(file).close();
+
+            try {
+                final Process process = Runtime.getRuntime().exec(new String[]{
+                        "logcat", "-b", "all", "-d", "-v", "threadtime", "--pid", Integer.toString(android.os.Process.myPid()), "-f", file.getAbsolutePath(), "*:V"});
+                if (process.waitFor() != 0) {
+                    try (final BufferedReader reader = new BufferedReader(new InputStreamReader(process.getErrorStream()))) {
+                        final StringBuilder errors = new StringBuilder();
+                        errors.append("Unable to run logcat: ");
+                        String line;
+                        while ((line = reader.readLine()) != null)
+                            errors.append(line);
+                        throw new Exception(errors.toString());
+                    }
+                }
+            } catch (Exception e) {
+                file.delete();
+                throw e;
+            }
+            return file.getAbsolutePath();
+        }).whenComplete(this::exportLogComplete);
+    }
+
+    private void exportLogComplete(final String filePath, final Throwable throwable) {
+        if (throwable != null) {
+            final String error = ExceptionLoggers.unwrapMessage(throwable);
+            final String message = getContext().getString(R.string.log_export_error, error);
+            Log.e(TAG, message, throwable);
+            Snackbar.make(
+                    getPrefActivity(this).findViewById(android.R.id.content),
+                    message, Snackbar.LENGTH_LONG).show();
+        } else {
+            exportedFilePath = filePath;
+            setEnabled(false);
+            notifyChanged();
+        }
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return exportedFilePath == null ?
+                getContext().getString(R.string.log_export_summary) :
+                getContext().getString(R.string.log_export_success, exportedFilePath);
+    }
+
+    @Override
+    public CharSequence getTitle() {
+        return getContext().getString(R.string.log_exporter_title);
+    }
+
+    @Override
+    protected void onClick() {
+        getPrefActivity(this).ensurePermissions(
+                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
+                (permissions, granted) -> {
+                    if (granted.length > 0 && granted[0] == PackageManager.PERMISSION_GRANTED)
+                        exportLog();
+                });
+    }
+
+}