GUACAMOLE-462: Directly support associating session recordings with history entries at API level.

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/AbstractActivityLog.java

@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.net.auth;
+
+import org.apache.guacamole.language.TranslatableMessage;
+
+/**
+ * Base implementation of an ActivityLog, providing storage and simple
+ * getters/setters for its main properties.
+ */
+public abstract class AbstractActivityLog implements ActivityLog {
+
+    /**
+     * The type of this ActivityLog.
+     */
+    private final Type type;
+
+    /**
+     * A human-readable description of this log.
+     */
+    private final TranslatableMessage description;
+
+    /**
+     * Creates a new AbstractActivityLog having the given type and
+     * human-readable description.
+     *
+     * @param type
+     *     The type of this ActivityLog.
+     *
+     * @param description
+     *     A human-readable message that describes this log.
+     */
+    public AbstractActivityLog(Type type, TranslatableMessage description) {
+        this.type = type;
+        this.description = description;
+    }
+
+    @Override
+    public Type getType() {
+        return type;
+    }
+
+    @Override
+    public TranslatableMessage getDescription() {
+        return description;
+    }
+
+}

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/ActivityLog.java

@@ -0,0 +1,142 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.net.auth;
+
+import java.io.InputStream;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.language.TranslatableMessage;
+
+/**
+ * An arbitrary log of an activity whose content may be exposed to a user with
+ * sufficient privileges. Types of content that might be exposed in this way
+ * include textual server logs, Guacamole session recordings, and typescripts.
+ */
+public interface ActivityLog {
+
+    /**
+     * The value returned by {@link #getSize()} if the number of available
+     * bytes within {@link #getContent()} is unknown.
+     */
+    public static final long UNKNOWN_SIZE = -1;
+
+    /**
+     * All possible types of {@link ActivityLog}.
+     */
+    enum Type {
+
+        /**
+         * A Guacamole session recording in the form of a Guacamole protocol
+         * dump.
+         */
+        GUACAMOLE_SESSION_RECORDING("application/octet-stream"),
+
+        /**
+         * A text log from a server-side process, such as the Guacamole web
+         * application or guacd.
+         */
+        SERVER_LOG("text/plain"),
+
+        /**
+         * A text session recording in the form of a standard typescript.
+         */
+        TYPESCRIPT("application/octet-stream"),
+
+        /**
+         * The timing file related to a typescript.
+         */
+        TYPESCRIPT_TIMING("text/plain");
+
+        /**
+         * The MIME type of the content of an activity log of this type.
+         */
+        private final String contentType;
+
+        /**
+         * Creates a new Type that may be associated with content having the
+         * given MIME type.
+         *
+         * @param contentType
+         *     The MIME type of the content of an activity log of this type.
+         */
+        Type(String contentType) {
+            this.contentType = contentType;
+        }
+
+        /**
+         * Returns the MIME type of the content of an activity log of this
+         * type, as might be sent via the HTTP "Content-Type" header.
+         *
+         * @return
+         *     The MIME type of the content of an activity log of this type.
+         */
+        public String getContentType() {
+            return contentType;
+        }
+
+    }
+
+    /**
+     * Returns the type of this activity log. The type of an activity log
+     * dictates how its content should be interpreted or exposed.
+     *
+     * @return
+     *     The type of this activity log.
+     */
+    Type getType();
+
+    /**
+     * Returns a human-readable message that describes this log. This message
+     * should provide sufficient information for a user with access to this
+     * log to understand its context and/or purpose.
+     *
+     * @return
+     *     A human-readable message that describes this log.
+     */
+    TranslatableMessage getDescription();
+
+    /**
+     * Returns the number of bytes available for reading within the content of
+     * this log. If this value is unknown, -1 ({@link #UNKNOWN_SIZE}) should be
+     * returned.
+     *
+     * @return
+     *     The number of bytes available for reading within the content of
+     *     this log, or -1 ({@link #UNKNOWN_SIZE}) if this value is unknown.
+     *
+     * @throws GuacamoleException
+     *     If the size of the content of this log cannot be determined due to
+     *     an error.
+     */
+    long getSize() throws GuacamoleException;
+
+    /**
+     * Returns an InputStream that allows the content of this log to be read.
+     * Multiple instances of this InputStream may be open at any given time. It
+     * is the responsibility of the caller to close the returned InputStream.
+     *
+     * @return
+     *     An InputStream that allows the content of this log to be read.
+     *
+     * @throws GuacamoleException
+     *     If the content of this log cannot be read due to an error.
+     */
+    InputStream getContent() throws GuacamoleException;
+
+}

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/ActivityRecord.java

@@ -92,6 +92,20 @@ public interface ActivityRecord extends ReadableAttributes {
         return null;
     }
 
+    /**
+     * Returns a Map of logs related to this record and accessible by the
+     * current user, such as Guacamole session recordings. Each log is
+     * associated with a corresponding, arbitrary, unique name. If the user
+     * does not have access to any logs, or if no logs are available, this may
+     * be an empty map.
+     *
+     * @return
+     *     A Map of logs related to this record.
+     */
+    public default Map<String, ActivityLog> getLogs() {
+        return Collections.emptyMap();
+    }
+
     @Override 
     public default Map<String, String> getAttributes() {
         return Collections.emptyMap();

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/DelegatingActivityRecord.java

@@ -86,6 +86,11 @@ public class DelegatingActivityRecord implements ActivityRecord {
         return record.getUUID();
     }
 
+    @Override
+    public Map<String, ActivityLog> getLogs() {
+        return record.getLogs();
+    }
+
     @Override
     public Map<String, String> getAttributes() {
         return record.getAttributes();

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/FileActivityLog.java

@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.net.auth;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.GuacamoleResourceNotFoundException;
+import org.apache.guacamole.language.TranslatableMessage;
+
+/**
+ * ActivityLog implementation that exposes the content of a local file.
+ */
+public class FileActivityLog extends AbstractActivityLog {
+
+    /**
+     * The File providing the content of this log.
+     */
+    private final File content;
+
+    /**
+     * Creates a new FileActivityLog that exposes the content of the given
+     * local file as an {@link ActivityLog}.
+     *
+     * @param type
+     *     The type of this ActivityLog.
+     *
+     * @param description
+     *     A human-readable message that describes this log.
+     *
+     * @param content
+     *     The File that should be used to provide the content of this log.
+     */
+    public FileActivityLog(Type type, TranslatableMessage description, File content) {
+        super(type, description);
+        this.content = content;
+    }
+
+    @Override
+    public long getSize() throws GuacamoleException {
+        return content.length();
+    }
+
+    @Override
+    public InputStream getContent() throws GuacamoleException {
+        try {
+            return new FileInputStream(content);
+        }
+        catch (FileNotFoundException e) {
+            throw new GuacamoleResourceNotFoundException("Associated file "
+                    + "does not exist or cannot be read.", e);
+        }
+    }
+
+}