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

   1 /*
   2  * Sone - FcpInterface.java - Copyright © 2011 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 java.util.Collections;
  21 import java.util.HashMap;
  22 import java.util.Map;
  23 import java.util.logging.Level;
  24 import java.util.logging.Logger;
  25
  26 import net.pterodactylus.sone.core.Core;
  27 import net.pterodactylus.sone.freenet.fcp.Command.AccessType;
  28 import net.pterodactylus.sone.freenet.fcp.Command.ErrorResponse;
  29 import net.pterodactylus.sone.freenet.fcp.Command.Response;
  30 import net.pterodactylus.sone.freenet.fcp.FcpException;
  31 import net.pterodactylus.util.logging.Logging;
  32 import net.pterodactylus.util.validation.Validation;
  33 import freenet.pluginmanager.FredPluginFCP;
  34 import freenet.pluginmanager.PluginNotFoundException;
  35 import freenet.pluginmanager.PluginReplySender;
  36 import freenet.support.SimpleFieldSet;
  37 import freenet.support.api.Bucket;
  38
  39 /**
  40  * Implementation of an FCP interface for other clients or plugins to
  41  * communicate with Sone.
  42  *
  43  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  44  */
  45 public class FcpInterface {
  46
  47         /**
  48          * The action level that full access for the FCP connection is required.
  49          *
  50          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  51          */
  52         public enum FullAccessRequired {
  53
  54                 /** No action requires full access. */
  55                 NO,
  56
  57                 /** All writing actions require full access. */
  58                 WRITING,
  59
  60                 /** All actions require full access. */
  61                 ALWAYS,
  62
  63         }
  64
  65         /** The logger. */
  66         private static final Logger logger = Logging.getLogger(FcpInterface.class);
  67
  68         /** Whether the FCP interface is currently active. */
  69         private volatile boolean active;
  70
  71         /** What function full access is required for. */
  72         private volatile FullAccessRequired fullAccessRequired = FullAccessRequired.ALWAYS;
  73
  74         /** All available FCP commands. */
  75         private final Map<String, AbstractSoneCommand> commands = Collections.synchronizedMap(new HashMap<String, AbstractSoneCommand>());
  76
  77         /**
  78          * Creates a new FCP interface.
  79          *
  80          * @param core
  81          *            The core
  82          */
  83         public FcpInterface(Core core) {
  84                 commands.put("Version", new VersionCommand(core));
  85                 commands.put("GetLocalSones", new GetLocalSonesCommand(core));
  86                 commands.put("GetSones", new GetSonesCommand(core));
  87                 commands.put("GetPost", new GetPostCommand(core));
  88                 commands.put("GetPosts", new GetPostsCommand(core));
  89                 commands.put("GetPostFeed", new GetPostFeedCommand(core));
  90                 commands.put("LikePost", new LikePostCommand(core));
  91                 commands.put("LikeReply", new LikeReplyCommand(core));
  92                 commands.put("CreatePost", new CreatePostCommand(core));
  93                 commands.put("CreateReply", new CreateReplyCommand(core));
  94                 commands.put("DeletePost", new DeletePostCommand(core));
  95                 commands.put("DeleteReply", new DeleteReplyCommand(core));
  96         }
  97
  98         //
  99         // ACCESSORS
 100         //
 101
 102         /**
 103          * Sets whether the FCP interface should handle requests. If {@code active}
 104          * is {@code false}, all requests are answered with an error.
 105          *
 106          * @param active
 107          *            {@code true} to activate the FCP interface, {@code false} to
 108          *            deactivate the FCP interface
 109          */
 110         public void setActive(boolean active) {
 111                 this.active = active;
 112         }
 113
 114         /**
 115          * Sets the action level for which full FCP access is required.
 116          *
 117          * @param fullAccessRequired
 118          *            The action level for which full FCP access is required
 119          */
 120         public void setFullAccessRequired(FullAccessRequired fullAccessRequired) {
 121                 Validation.begin().isNotNull("FullAccessRequired", fullAccessRequired).check();
 122                 this.fullAccessRequired = fullAccessRequired;
 123         }
 124
 125         //
 126         // ACTIONS
 127         //
 128
 129         /**
 130          * Handles a plugin FCP request.
 131          *
 132          * @param pluginReplySender
 133          *            The reply sender
 134          * @param parameters
 135          *            The message parameters
 136          * @param data
 137          *            The message data (may be {@code null})
 138          * @param accessType
 139          *            One of {@link FredPluginFCP#ACCESS_DIRECT},
 140          *            {@link FredPluginFCP#ACCESS_FCP_FULL},
 141          *            {@link FredPluginFCP#ACCESS_FCP_RESTRICTED}
 142          */
 143         public void handle(PluginReplySender pluginReplySender, SimpleFieldSet parameters, Bucket data, int accessType) {
 144                 if (!active) {
 145                         try {
 146                                 sendReply(pluginReplySender, null, new ErrorResponse(400, "FCP Interface deactivated"));
 147                         } catch (PluginNotFoundException pnfe1) {
 148                                 logger.log(Level.FINE, "Could not set error to plugin.", pnfe1);
 149                         }
 150                         return;
 151                 }
 152                 AbstractSoneCommand command = commands.get(parameters.get("Message"));
 153                 if ((accessType == FredPluginFCP.ACCESS_FCP_RESTRICTED) && (((fullAccessRequired == FullAccessRequired.WRITING) && command.requiresWriteAccess()) || (fullAccessRequired == FullAccessRequired.ALWAYS))) {
 154                         try {
 155                                 sendReply(pluginReplySender, null, new ErrorResponse(401, "Not authorized"));
 156                         } catch (PluginNotFoundException pnfe1) {
 157                                 logger.log(Level.FINE, "Could not set error to plugin.", pnfe1);
 158                         }
 159                         return;
 160                 }
 161                 try {
 162                         if (command == null) {
 163                                 sendReply(pluginReplySender, null, new ErrorResponse("Unrecognized Message: " + parameters.get("Message")));
 164                                 return;
 165                         }
 166                         String identifier = parameters.get("Identifier");
 167                         if ((identifier == null) || (identifier.length() == 0)) {
 168                                 sendReply(pluginReplySender, null, new ErrorResponse("Missing Identifier."));
 169                                 return;
 170                         }
 171                         try {
 172                                 Response response = command.execute(parameters, data, AccessType.values()[accessType]);
 173                                 sendReply(pluginReplySender, identifier, response);
 174                         } catch (FcpException fe1) {
 175                                 sendReply(pluginReplySender, identifier, new ErrorResponse("Error executing command: " + fe1.getMessage()));
 176                         }
 177                 } catch (PluginNotFoundException pnfe1) {
 178                         logger.log(Level.WARNING, "Could not find destination plugin: " + pluginReplySender);
 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 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                 if (response.hasData()) {
 204                         pluginReplySender.send(replyParameters, response.getData());
 205                 } else if (response.hasBucket()) {
 206                         pluginReplySender.send(replyParameters, response.getBucket());
 207                 } else {
 208                         pluginReplySender.send(replyParameters);
 209                 }
 210         }
 211
 212 }