Issue 5931 - Create tests for util package

adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/Subscriptions.java

Index: adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/Subscriptions.java
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new file mode 100644
--- /dev/null
+++ b/adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/Subscriptions.java
@@ -0,0 +1,298 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.sbrowser.contentblocker.engine;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+import org.adblockplus.sbrowser.contentblocker.engine.Subscription.Type;
+
+import android.util.Log;
+
+/**
+ * This class holds all listed subscriptions and manages the subscription
+ * aggregation cache folder.
+ */
+final class Subscriptions
+{
+  private static final String TAG = Subscriptions.class.getSimpleName();
+  private static final String[] USER_SUBSCRIPTIONS =
+  { Engine.USER_FILTERS_TITLE, Engine.USER_EXCEPTIONS_TITLE };
+  // Filters that begin with '|$' , '||$' , '@@|$' or '@@||$'
+  // See https://issues.adblockplus.org/ticket/4772
+  private static final String UNSUPPORTED_FILTERS_REGEX =  "^(\\|\\$|\\|\\|\\$|@@\\|\\$|@@\\|\\|\\$).*";
+  private final HashMap<String, Subscription> subscriptions = new HashMap<>();
+
+  private final Engine engine;
+  private final File subscriptionFolder;
+  private final File cacheFolder;
+  private final boolean wasUninitialized;
+
+  private Subscriptions(final Engine engine, final File appFolder, final File cacheFolder)
+  {
+    this.engine = engine;
+    this.subscriptionFolder = appFolder;
+    this.wasUninitialized = !this.subscriptionFolder.exists();
+    this.cacheFolder = cacheFolder;
+  }
+
+  public boolean wasUnitialized()
+  {
+    return this.wasUninitialized;
+  }
+
+  public File createAndWriteFile() throws IOException
+  {
+    for (;;)
+    {
+      final File file = new File(this.cacheFolder, String.format(Locale.ENGLISH, "tmp-%d.txt",
+          (int) (Math.random() * 1e8)));
+      if (!file.exists())
+      {
+        Log.d(TAG, "Writing filters to " + file);
+        this.writeFile(file);
+        return file;
+      }
+    }
+  }
+
+  List<SubscriptionInfo> getSubscriptions(final Engine engine)
+  {
+    final ArrayList<SubscriptionInfo> subs = new ArrayList<>();
+    for (final Subscription sub : this.subscriptions.values())
+    {
+      subs.add(SubscriptionInfo.create(engine, sub));
+    }
+    return subs;
+  }
+
+  void loadSubscriptions(final List<Subscription> list)
+  {
+    list.addAll(this.subscriptions.values());
+  }
+
+  public boolean hasSubscription(final String id)
+  {
+    return this.subscriptions.containsKey(id);
+  }
+
+  public boolean isSubscriptionEnabled(final String id)
+  {
+    final Subscription sub = this.subscriptions.get(id);
+    return sub != null && sub.isEnabled();
+  }
+
+  public boolean changeSubscriptionState(final String id, final boolean enabled) throws IOException
+  {
+    final Subscription sub = this.subscriptions.get(id);
+    if (sub != null)
+    {
+      if (enabled != sub.isEnabled())
+      {
+        sub.setEnabled(enabled);
+        sub.serializeMetaData(this.getMetaFile(sub));
+        if (enabled)
+        {
+          this.engine.enqueueDownload(sub, true);
+        }
+
+        this.engine.subscriptionStateChanged();
+        this.engine.requestUpdateBroadcast();
+        return true;
+      }
+    }
+    return false;
+  }
+
+  File getFiltersFile(final Subscription sub)
+  {
+    final File filtersFile;
+    if (sub.getType() == Type.USER)
+    {
+      filtersFile = new File(this.subscriptionFolder, "user_" + sub.getTitle() + ".sub");
+    }
+    else
+    {
+      filtersFile = new File(this.subscriptionFolder, "url_"
+          + new File(sub.getURL().getPath()).getName() + ".sub");
+    }
+    return filtersFile;
+  }
+
+  File getMetaFile(final Subscription sub)
+  {
+    return new File(getFiltersFile(sub).getAbsolutePath() + ".meta");
+  }
+
+  void persistSubscription(final Subscription sub) throws IOException
+  {
+    sub.serializeSubscription(this.getMetaFile(sub), this.getFiltersFile(sub));
+  }
+
+  void persistSubscriptions() throws IOException
+  {
+    for (final Subscription sub : this.subscriptions.values())
+    {
+      this.persistSubscription(sub);
+    }
+  }
+
+  /**
+   * This method combines all currently listed and enabled subscriptions into
+   * one text file.
+   *
+   * @param output
+   * @throws IOException
+   */
+  private void writeFile(final File output) throws IOException
+  {
+    final HashSet<String> filters = new HashSet<>();
+    for (final Subscription s : this.subscriptions.values())
+    {
+      if (s.isEnabled())
+      {
+        Log.d(TAG, "Adding filters for '" + s.getId() + "'");
+        s.deserializeFilters(this.getFiltersFile(s));
+        s.copyFilters(filters);
+        s.clearFilters();
+      }
+      if ((!s.isMetaDataValid() || !s.isFiltersValid()) && s.getURL() != null)
+      {
+        this.engine.enqueueDownload(s, true);
+      }
+    }
+
+    try (final BufferedWriter w = new BufferedWriter(
+        new OutputStreamWriter(new FileOutputStream(output), StandardCharsets.UTF_8)))
+    {
+      Log.d(TAG, "Writing " + filters.size() + " filters");
+      Engine.writeFilterHeaders(w);
+      for (final String filter : filters)
+      {
+        // This is a temporary fix to not write filters that might crash Samsung Internet
+        // See https://issues.adblockplus.org/ticket/4772
+        if (!filter.matches(UNSUPPORTED_FILTERS_REGEX))
+        {
+          w.write(filter);
+          w.write('\n');
+        }
+        else
+        {
+          Log.d(TAG, "Ignoring unsupported filter: " + filter);
+        }
+      }
+    }
+  }
+
+  public Subscription add(final Subscription sub)
+  {
+    final String id = sub.getId();
+    if (!this.subscriptions.containsKey(id))
+    {
+      this.subscriptions.put(id, sub);
+      return sub;
+    }
+    return this.subscriptions.get(id);
+  }
+
+  public boolean remove(final String id)
+  {
+    return this.subscriptions.remove(id) != null;
+  }
+
+  public static Subscriptions initialize(final Engine engine, final File appFolder,
+      final File cacheFolder)
+  {
+    final Subscriptions subs = new Subscriptions(engine, appFolder, cacheFolder);
+
+    subs.subscriptionFolder.mkdirs();
+    subs.cacheFolder.mkdirs();
+
+    final File[] files = subs.subscriptionFolder.listFiles();
+    for (File f : files)
+    {
+      if (f.getName().endsWith(".sub"))
+      {
+        final File metaFile = new File(f.getAbsolutePath() + ".meta");
+        if (metaFile.exists())
+        {
+          final Subscription sub = Subscription.deserializeSubscription(metaFile);
+          if (sub != null)
+          {
+            subs.subscriptions.put(sub.getId(), sub);
+          }
+        }
+      }
+    }
+
+    subs.createUserSubscriptions();
+
+    return subs;
+  }
+
+  /**
+   * Adds default user subscriptions if not exist.
+   */
+  private void createUserSubscriptions()
+  {
+    for (String title : USER_SUBSCRIPTIONS)
+    {
+      final Subscription userSub = Subscription.createUserSubscription(title);
+      if (!this.subscriptions.containsKey(userSub.getId()))
+      {
+        this.subscriptions.put(userSub.getId(), userSub);
+      }
+    }
+  }
+
+  public void checkForUpdates() throws IOException
+  {
+    for (Subscription sub : this.subscriptions.values())
+    {
+      if (sub.isEnabled())
+      {
+        this.engine.enqueueDownload(sub, false);
+      }
+    }
+  }
+
+  public void updateSubscription(final String id, final int responseCode, final String text,
+      final Map<String, String> httpHeaders)
+      throws IOException
+  {
+    final Subscription sub = this.subscriptions.get(id);
+    if (sub != null)
+    {
+      if (sub.updateSubscription(responseCode, text, httpHeaders, this.getMetaFile(sub),
+          this.getFiltersFile(sub)))
+      {
+        this.engine.requestUpdateBroadcast();
+      }
+    }
+  }
+}