src/main/java/net/pterodactylus/sone/fcp/FcpInterface.java

   1 /*
   2  * Sone - FcpInterface.java - Copyright © 2011–2016 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.fcp;
  19
  20 import static com.google.common.base.Preconditions.checkNotNull;
  21 import static java.util.logging.Logger.getLogger;
  22 import static net.pterodactylus.sone.fcp.FcpInterface.FullAccessRequired.NO;
  23 import static net.pterodactylus.sone.fcp.FcpInterface.FullAccessRequired.WRITING;
  24 import static net.pterodactylus.sone.freenet.fcp.Command.AccessType.RESTRICTED_FCP;
  25
  26 import java.util.HashMap;
  27 import java.util.Map;
  28 import java.util.concurrent.atomic.AtomicBoolean;
  29 import java.util.concurrent.atomic.AtomicReference;
  30 import java.util.logging.Level;
  31 import java.util.logging.Logger;
  32
  33 import javax.annotation.Nonnull;
  34 import javax.inject.Singleton;
  35
  36 import net.pterodactylus.sone.core.Core;
  37 import net.pterodactylus.sone.fcp.event.FcpInterfaceActivatedEvent;
  38 import net.pterodactylus.sone.fcp.event.FcpInterfaceDeactivatedEvent;
  39 import net.pterodactylus.sone.fcp.event.FullAccessRequiredChanged;
  40 import net.pterodactylus.sone.freenet.fcp.Command.AccessType;
  41 import net.pterodactylus.sone.freenet.fcp.Command.ErrorResponse;
  42 import net.pterodactylus.sone.freenet.fcp.Command.Response;
  43
  44 import freenet.pluginmanager.FredPluginFCP;
  45 import freenet.pluginmanager.PluginNotFoundException;
  46 import freenet.pluginmanager.PluginReplySender;
  47 import freenet.support.SimpleFieldSet;
  48 import freenet.support.api.Bucket;
  49
  50 import com.google.common.annotations.VisibleForTesting;
  51 import com.google.common.eventbus.Subscribe;
  52 import com.google.inject.Inject;
  53
  54 /**
  55  * Implementation of an FCP interface for other clients or plugins to
  56  * communicate with Sone.
  57  *
  58  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  59  */
  60 @Singleton
  61 public class FcpInterface {
  62
  63         /**
  64          * The action level that full access for the FCP connection is required.
  65          *
  66          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  67          */
  68         public enum FullAccessRequired {
  69
  70                 /** No action requires full access. */
  71                 NO,
  72
  73                 /** All writing actions require full access. */
  74                 WRITING,
  75
  76                 /** All actions require full access. */
  77                 ALWAYS,
  78
  79         }
  80
  81         /** The logger. */
  82         private static final Logger logger = getLogger(FcpInterface.class.getName());
  83
  84         /** Whether the FCP interface is currently active. */
  85         private final AtomicBoolean active = new AtomicBoolean();
  86
  87         /** What function full access is required for. */
  88         private final AtomicReference<FullAccessRequired> fullAccessRequired = new AtomicReference<FullAccessRequired>(FullAccessRequired.ALWAYS);
  89
  90         /** All available FCP commands. */
  91         private final Map<String, AbstractSoneCommand> commands;
  92         private final AccessAuthorizer accessAuthorizer;
  93
  94         /**
  95          * Creates a new FCP interface.
  96          *
  97          * @param core
  98          *            The core
  99          */
 100         @Inject
 101         public FcpInterface(Core core, CommandSupplier commandSupplier, AccessAuthorizer accessAuthorizer) {
 102                 commands = commandSupplier.supplyCommands(core);
 103                 this.accessAuthorizer = accessAuthorizer;
 104         }
 105
 106         //
 107         // ACCESSORS
 108         //
 109
 110         @VisibleForTesting
 111         boolean isActive() {
 112                 return active.get();
 113         }
 114
 115         private void setActive(boolean active) {
 116                 this.active.set(active);
 117         }
 118
 119         @VisibleForTesting
 120         FullAccessRequired getFullAccessRequired() {
 121                 return fullAccessRequired.get();
 122         }
 123
 124         private void setFullAccessRequired(FullAccessRequired fullAccessRequired) {
 125                 this.fullAccessRequired.set(checkNotNull(fullAccessRequired, "fullAccessRequired must not be null"));
 126         }
 127
 128         //
 129         // ACTIONS
 130         //
 131
 132         /**
 133          * Handles a plugin FCP request.
 134          *
 135          * @param pluginReplySender
 136          *            The reply sender
 137          * @param parameters
 138          *            The message parameters
 139          * @param data
 140          *            The message data (may be {@code null})
 141          * @param accessType
 142          *            One of {@link FredPluginFCP#ACCESS_DIRECT},
 143          *            {@link FredPluginFCP#ACCESS_FCP_FULL},
 144          *            {@link FredPluginFCP#ACCESS_FCP_RESTRICTED}
 145          */
 146         public void handle(PluginReplySender pluginReplySender, SimpleFieldSet parameters, Bucket data, int accessType) {
 147                 String identifier = parameters.get("Identifier");
 148                 if ((identifier == null) || (identifier.length() == 0)) {
 149                         sendErrorReply(pluginReplySender, null, 400, "Missing Identifier.");
 150                         return;
 151                 }
 152                 if (!active.get()) {
 153                         sendErrorReply(pluginReplySender, identifier, 503, "FCP Interface deactivated");
 154                         return;
 155                 }
 156                 AbstractSoneCommand command = commands.get(parameters.get("Message"));
 157                 if (command == null) {
 158                         sendErrorReply(pluginReplySender, identifier, 404, "Unrecognized Message: " + parameters.get("Message"));
 159                         return;
 160                 }
 161                 if (!accessAuthorizer.authorized(AccessType.values()[accessType], fullAccessRequired.get(), command.requiresWriteAccess())) {
 162                         sendErrorReply(pluginReplySender, identifier, 401, "Not authorized");
 163                         return;
 164                 }
 165                 try {
 166                         Response response = command.execute(parameters);
 167                         sendReply(pluginReplySender, identifier, response);
 168                 } catch (Exception e1) {
 169                         logger.log(Level.WARNING, "Could not process FCP command “%s”.", command);
 170                         sendErrorReply(pluginReplySender, identifier, 500, "Error executing command: " + e1.getMessage());
 171                 }
 172         }
 173
 174         private void sendErrorReply(PluginReplySender pluginReplySender, String identifier, int errorCode, String message) {
 175                 try {
 176                         sendReply(pluginReplySender, identifier, new ErrorResponse(errorCode, message));
 177                 } catch (PluginNotFoundException pnfe1) {
 178                         logger.log(Level.FINE, "Could not send error to plugin.", pnfe1);
 179                 }
 180         }
 181
 182         //
 183         // PRIVATE METHODS
 184         //
 185
 186         /**
 187          * Sends the given response to the given plugin.
 188          *
 189          * @param pluginReplySender
 190          *            The reply sender
 191          * @param identifier
 192          *            The identifier (may be {@code null})
 193          * @param response
 194          *            The response to send
 195          * @throws PluginNotFoundException
 196          *             if the plugin can not be found
 197          */
 198         private static void sendReply(PluginReplySender pluginReplySender, String identifier, Response response) throws PluginNotFoundException {
 199                 SimpleFieldSet replyParameters = response.getReplyParameters();
 200                 if (identifier != null) {
 201                         replyParameters.putOverwrite("Identifier", identifier);
 202                 }
 203                 pluginReplySender.send(replyParameters);
 204         }
 205
 206         @Subscribe
 207         public void fcpInterfaceActivated(FcpInterfaceActivatedEvent fcpInterfaceActivatedEvent) {
 208                 setActive(true);
 209         }
 210
 211         @Subscribe
 212         public void fcpInterfaceDeactivated(FcpInterfaceDeactivatedEvent fcpInterfaceDeactivatedEvent) {
 213                 setActive(false);
 214         }
 215
 216         @Subscribe
 217         public void fullAccessRequiredChanged(FullAccessRequiredChanged fullAccessRequiredChanged) {
 218                 setFullAccessRequired(fullAccessRequiredChanged.getFullAccessRequired());
 219         }
 220
 221         @Singleton
 222         public static class CommandSupplier {
 223
 224                 public Map<String, AbstractSoneCommand> supplyCommands(Core core) {
 225                         Map<String, AbstractSoneCommand> commands = new HashMap<>();
 226                         commands.put("Version", new VersionCommand(core));
 227                         commands.put("GetLocalSones", new GetLocalSonesCommand(core));
 228                         commands.put("GetSones", new GetSonesCommand(core));
 229                         commands.put("GetSone", new GetSoneCommand(core));
 230                         commands.put("GetPost", new GetPostCommand(core));
 231                         commands.put("GetPosts", new GetPostsCommand(core));
 232                         commands.put("GetPostFeed", new GetPostFeedCommand(core));
 233                         commands.put("LockSone", new LockSoneCommand(core));
 234                         commands.put("UnlockSone", new UnlockSoneCommand(core));
 235                         commands.put("LikePost", new LikePostCommand(core));
 236                         commands.put("LikeReply", new LikeReplyCommand(core));
 237                         commands.put("CreatePost", new CreatePostCommand(core));
 238                         commands.put("CreateReply", new CreateReplyCommand(core));
 239                         commands.put("DeletePost", new DeletePostCommand(core));
 240                         commands.put("DeleteReply", new DeleteReplyCommand(core));
 241                         return commands;
 242                 }
 243
 244         }
 245
 246         @Singleton
 247         public static class AccessAuthorizer {
 248
 249                 public boolean authorized(@Nonnull AccessType accessType, @Nonnull FullAccessRequired fullAccessRequired, boolean commandRequiresWriteAccess) {
 250                         return (accessType != RESTRICTED_FCP) || (fullAccessRequired == NO) || ((fullAccessRequired == WRITING) && !commandRequiresWriteAccess);
 251                 }
 252
 253         }
 254
 255 }