src/main/java/de/thm/arsnova/config/WebSocketConfig.java

+package de.thm.arsnova.config;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.simp.config.ChannelRegistration;
+import org.springframework.messaging.simp.config.MessageBrokerRegistry;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
+import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
+import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
+
+import de.thm.arsnova.config.properties.MessageBrokerProperties;
+import de.thm.arsnova.config.properties.SecurityProperties;
+import de.thm.arsnova.websocket.handler.AuthChannelInterceptorAdapter;
+
+@Configuration
+@EnableWebSocketMessageBroker
+@EnableConfigurationProperties(MessageBrokerProperties.class)
+public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
+	private static final String MESSAGING_PREFIX = "/backend";
+	private static final String[] DESTINATION_PREFIX = {"/exchange", "/topic", "/queue"};
+	private static final String USER_REGISTRY_BROADCAST = "/topic/log-user-registry";
+	private static final String USER_DESTINATION_BROADCAST = "/queue/log-unresolved-user";
+
+	private final MessageBrokerProperties.Relay relayProperties;
+	private final AuthChannelInterceptorAdapter authChannelInterceptorAdapter;
+	private String[] corsOrigins;
+
+	@Autowired
+	public WebSocketConfig(
+			final MessageBrokerProperties messageBrokerProperties,
+			final SecurityProperties securityProperties,
+			final AuthChannelInterceptorAdapter authChannelInterceptorAdapter) {
+		this.relayProperties = messageBrokerProperties.getRelay();
+		this.corsOrigins = securityProperties.getCorsOrigins().stream().toArray(String[]::new);
+		this.authChannelInterceptorAdapter = authChannelInterceptorAdapter;
+	}
+
+	@Override
+	public void configureMessageBroker(final MessageBrokerRegistry config) {
+		config.setApplicationDestinationPrefixes(MESSAGING_PREFIX);
+
+		if (relayProperties.isEnabled()) {
+			config
+					.enableStompBrokerRelay(DESTINATION_PREFIX)
+					.setUserRegistryBroadcast(USER_REGISTRY_BROADCAST)
+					.setUserDestinationBroadcast(USER_DESTINATION_BROADCAST)
+					.setRelayHost(relayProperties.getHost())
+					.setRelayPort(relayProperties.getPort())
+					.setClientLogin(relayProperties.getUsername())
+					.setClientPasscode(relayProperties.getPassword());
+		} else {
+			config.enableSimpleBroker(DESTINATION_PREFIX);
+		}
+	}
+
+	@Override
+	public void registerStompEndpoints(final StompEndpointRegistry registry) {
+		registry.addEndpoint("/ws").setAllowedOrigins(corsOrigins).withSockJS();
+	}
+
+	@Override
+	public void configureClientInboundChannel(final ChannelRegistration registration) {
+		registration.interceptors(authChannelInterceptorAdapter);
+	}
+}

src/main/java/de/thm/arsnova/config/YamlPropertySourceFactory.java

+package de.thm.arsnova.config;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Properties;
+import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
+import org.springframework.core.env.PropertiesPropertySource;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.support.DefaultPropertySourceFactory;
+import org.springframework.core.io.support.EncodedResource;
+
+public class YamlPropertySourceFactory extends DefaultPropertySourceFactory {
+	@Override
+	public PropertySource<?> createPropertySource(final String name, final EncodedResource resource)
+			throws IOException {
+		try {
+			final YamlPropertiesFactoryBean yamlPropertiesFactoryBean = new PrefixedYamlPropertiesFactoryBean();
+			yamlPropertiesFactoryBean.setResources(resource.getResource());
+			yamlPropertiesFactoryBean.afterPropertiesSet();
+			final Properties properties = yamlPropertiesFactoryBean.getObject();
+
+			return new PropertiesPropertySource(name != null ? name : resource.getResource().getFilename(), properties);
+		} catch (final IllegalStateException e) {
+			if (e.getCause() instanceof FileNotFoundException) {
+				throw (FileNotFoundException) e.getCause();
+			}
+			throw e;
+		}
+	}
+}

src/main/java/de/thm/arsnova/config/package-info.java

 /**
- * Configuration of Spring's and ARSnova's components
+ * Configuration of Spring's and ARSnova's components.
  */
+
 package de.thm.arsnova.config;

src/main/java/de/thm/arsnova/config/properties/AuthenticationProviderProperties.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.config.properties;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.core.style.ToStringCreator;
+
+@ConfigurationProperties(AuthenticationProviderProperties.PREFIX)
+public class AuthenticationProviderProperties {
+	public static final String PREFIX = SecurityProperties.PREFIX + ".authentication-providers";
+
+	public abstract static class Provider {
+		public enum Role {
+			MODERATOR,
+			PARTICIPANT
+		}
+
+		private boolean enabled;
+		private String title;
+		private int order;
+		private Set<Role> allowedRoles;
+
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(final String title) {
+			this.title = title;
+		}
+
+		public int getOrder() {
+			return order;
+		}
+
+		public void setOrder(final int order) {
+			this.order = order;
+		}
+
+		public Set<Role> getAllowedRoles() {
+			return allowedRoles;
+		}
+
+		public void setAllowedRoles(final Set<Role> allowedRoles) {
+			this.allowedRoles = allowedRoles;
+		}
+	}
+
+	public static class Registered extends Provider {
+		private List<String> allowedEmailDomains;
+		private String registrationMailSubject;
+		private String registrationMailBody;
+		private String resetPasswordMailSubject;
+		private String resetPasswordMailBody;
+
+		public List<String> getAllowedEmailDomains() {
+			return allowedEmailDomains;
+		}
+
+		public void setAllowedEmailDomains(final List<String> allowedEmailDomains) {
+			this.allowedEmailDomains = allowedEmailDomains;
+		}
+
+		public String getRegistrationMailSubject() {
+			return registrationMailSubject;
+		}
+
+		public void setRegistrationMailSubject(final String registrationMailSubject) {
+			this.registrationMailSubject = registrationMailSubject;
+		}
+
+		public String getRegistrationMailBody() {
+			return registrationMailBody;
+		}
+
+		public void setRegistrationMailBody(final String registrationMailBody) {
+			this.registrationMailBody = registrationMailBody;
+		}
+
+		public String getResetPasswordMailSubject() {
+			return resetPasswordMailSubject;
+		}
+
+		public void setResetPasswordMailSubject(final String resetPasswordMailSubject) {
+			this.resetPasswordMailSubject = resetPasswordMailSubject;
+		}
+
+		public String getResetPasswordMailBody() {
+			return resetPasswordMailBody;
+		}
+
+		public void setResetPasswordMailBody(final String resetPasswordMailBody) {
+			this.resetPasswordMailBody = resetPasswordMailBody;
+		}
+	}
+
+	public static class Guest extends Provider {
+
+	}
+
+	public static class Ldap extends Provider {
+		private String hostUrl;
+		private String userDnPattern;
+		private String userIdAttribute;
+		private String userSearchFilter;
+		private String userSearchBase;
+		private String managerUserDn;
+		private String managerPassword;
+		private int connectTimeout;
+
+		public String getHostUrl() {
+			return hostUrl;
+		}
+
+		public void setHostUrl(final String hostUrl) {
+			this.hostUrl = hostUrl;
+		}
+
+		public String getUserDnPattern() {
+			return userDnPattern;
+		}
+
+		public void setUserDnPattern(final String userDnPattern) {
+			this.userDnPattern = userDnPattern;
+		}
+
+		public String getUserIdAttribute() {
+			return userIdAttribute;
+		}
+
+		public void setUserIdAttribute(final String userIdAttribute) {
+			this.userIdAttribute = userIdAttribute;
+		}
+
+		public String getUserSearchFilter() {
+			return userSearchFilter;
+		}
+
+		public void setUserSearchFilter(final String userSearchFilter) {
+			this.userSearchFilter = userSearchFilter;
+		}
+
+		public String getUserSearchBase() {
+			return userSearchBase;
+		}
+
+		public void setUserSearchBase(final String userSearchBase) {
+			this.userSearchBase = userSearchBase;
+		}
+
+		public String getManagerUserDn() {
+			return managerUserDn;
+		}
+
+		public void setManagerUserDn(final String managerUserDn) {
+			this.managerUserDn = managerUserDn;
+		}
+
+		public String getManagerPassword() {
+			return managerPassword;
+		}
+
+		public void setManagerPassword(final String managerPassword) {
+			this.managerPassword = managerPassword;
+		}
+
+		public int getConnectTimeout() {
+			return connectTimeout;
+		}
+
+		public void setConnectTimeout(final int connectTimeout) {
+			this.connectTimeout = connectTimeout;
+		}
+	}
+
+	public static class Oidc extends Provider {
+		private String issuer;
+		private String clientId;
+		private String secret;
+
+		public String getIssuer() {
+			return issuer;
+		}
+
+		public void setIssuer(final String issuer) {
+			this.issuer = issuer;
+		}
+
+		public String getClientId() {
+			return clientId;
+		}
+
+		public void setClientId(final String clientId) {
+			this.clientId = clientId;
+		}
+
+		public String getSecret() {
+			return secret;
+		}
+
+		public void setSecret(final String secret) {
+			this.secret = secret;
+		}
+	}
+
+	public static class Saml extends Provider {
+		public static class Idp {
+			private String metaFile;
+
+			public String getMetaFile() {
+				return metaFile;
+			}
+
+			public void setMetaFile(final String metaFile) {
+				this.metaFile = metaFile;
+			}
+		}
+
+		public static class Sp {
+			private String metaFile;
+			private String entityId;
+
+			public String getMetaFile() {
+				return metaFile;
+			}
+
+			public void setMetaFile(final String metaFile) {
+				this.metaFile = metaFile;
+			}
+
+			public String getEntityId() {
+				return entityId;
+			}
+
+			public void setEntityId(final String entityId) {
+				this.entityId = entityId;
+			}
+		}
+
+		public static class Keystore {
+			private String file;
+			private String storePassword;
+			private String keyAlias;
+			private String keyPassword;
+
+			public String getFile() {
+				return file;
+			}
+
+			public void setFile(final String file) {
+				this.file = file;
+			}
+
+			public String getStorePassword() {
+				return storePassword;
+			}
+
+			public void setStorePassword(final String storePassword) {
+				this.storePassword = storePassword;
+			}
+
+			public String getKeyAlias() {
+				return keyAlias;
+			}
+
+			public void setKeyAlias(final String keyAlias) {
+				this.keyAlias = keyAlias;
+			}
+
+			public String getKeyPassword() {
+				return keyPassword;
+			}
+
+			public void setKeyPassword(final String keyPassword) {
+				this.keyPassword = keyPassword;
+			}
+		}
+
+		private boolean enabled;
+		private Idp idp;
+		private Sp sp;
+		private Keystore keystore;
+		private String userIdAttribute;
+		private int assertionConsumerServiceIndex;
+		private int maxAuthenticationLifetime;
+
+		@Override
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		@Override
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+
+		public Idp getIdp() {
+			return idp;
+		}
+
+		public void setIdp(final Idp idp) {
+			this.idp = idp;
+		}
+
+		public Sp getSp() {
+			return sp;
+		}
+
+		public void setSp(final Sp sp) {
+			this.sp = sp;
+		}
+
+		public Keystore getKeystore() {
+			return keystore;
+		}
+
+		public void setKeystore(final Keystore keystore) {
+			this.keystore = keystore;
+		}
+
+		public String getUserIdAttribute() {
+			return userIdAttribute;
+		}
+
+		public void setUserIdAttribute(final String userIdAttribute) {
+			this.userIdAttribute = userIdAttribute;
+		}
+
+		public int getAssertionConsumerServiceIndex() {
+			return assertionConsumerServiceIndex;
+		}
+
+		public void setAssertionConsumerServiceIndex(final int assertionConsumerServiceIndex) {
+			this.assertionConsumerServiceIndex = assertionConsumerServiceIndex;
+		}
+
+		public int getMaxAuthenticationLifetime() {
+			return maxAuthenticationLifetime;
+		}
+
+		public void setMaxAuthenticationLifetime(final int maxAuthenticationLifetime) {
+			this.maxAuthenticationLifetime = maxAuthenticationLifetime;
+		}
+	}
+
+	public static class Cas extends Provider {
+		private String hostUrl;
+
+		public String getHostUrl() {
+			return hostUrl;
+		}
+
+		public void setHostUrl(final String hostUrl) {
+			this.hostUrl = hostUrl;
+		}
+	}
+
+	public static class Oauth extends Provider {
+		private String key;
+		private String secret;
+
+		public String getKey() {
+			return key;
+		}
+
+		public void setKey(final String key) {
+			this.key = key;
+		}
+
+		public String getSecret() {
+			return secret;
+		}
+
+		public void setSecret(final String secret) {
+			this.secret = secret;
+		}
+
+		@Override
+		public String toString() {
+			return new ToStringCreator(this).append("enabled", isEnabled()).append("key", key).toString();
+		}
+	}
+
+	private Registered registered;
+	private Guest guest;
+	private List<Ldap> ldap;
+	private List<Oidc> oidc;
+	private Saml saml;
+	private Cas cas;
+	private Map<String, Oauth> oauth;
+
+	public Registered getRegistered() {
+		return registered;
+	}
+
+	public void setRegistered(final Registered registered) {
+		this.registered = registered;
+	}
+
+	public Guest getGuest() {
+		return guest;
+	}
+
+	public void setGuest(final Guest guest) {
+		this.guest = guest;
+	}
+
+	public List<Ldap> getLdap() {
+		return ldap;
+	}
+
+	public void setLdap(final List<Ldap> ldap) {
+		this.ldap = ldap;
+	}
+
+	public List<Oidc> getOidc() {
+		return oidc;
+	}
+
+	public void setOidc(final List<Oidc> oidc) {
+		this.oidc = oidc;
+	}
+
+	public Saml getSaml() {
+		return saml;
+	}
+
+	public void setSaml(final Saml saml) {
+		this.saml = saml;
+	}
+
+	public Cas getCas() {
+		return cas;
+	}
+
+	public void setCas(final Cas cas) {
+		this.cas = cas;
+	}
+
+	public Map<String, Oauth> getOauth() {
+		return oauth;
+	}
+
+	public void setOauth(final Map<String, Oauth> oauth) {
+		this.oauth = oauth;
+	}
+}

src/main/java/de/thm/arsnova/config/properties/CouchDbProperties.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.config.properties;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@ConfigurationProperties(CouchDbProperties.PREFIX)
+public class CouchDbProperties {
+	public static final String PREFIX = SystemProperties.PREFIX + ".couchdb";
+	private String host;
+	private int port;
+	private String dbName;
+	private String username;
+	private String password;
+	private String migrateFrom;
+
+	public String getHost() {
+		return host;
+	}
+
+	public void setHost(final String host) {
+		this.host = host;
+	}
+
+	public int getPort() {
+		return port;
+	}
+
+	public void setPort(final int port) {
+		this.port = port;
+	}
+
+	public String getDbName() {
+		return dbName;
+	}
+
+	public void setDbName(final String dbName) {
+		this.dbName = dbName;
+	}
+
+	public String getUsername() {
+		return username;
+	}
+
+	public void setUsername(final String username) {
+		this.username = username;
+	}
+
+	public String getPassword() {
+		return password;
+	}
+
+	public void setPassword(final String password) {
+		this.password = password;
+	}
+
+	public String getMigrateFrom() {
+		return migrateFrom;
+	}
+
+	public void setMigrateFrom(final String migrateFrom) {
+		this.migrateFrom = migrateFrom;
+	}
+}

src/main/java/de/thm/arsnova/config/properties/FeatureProperties.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.config.properties;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import de.thm.arsnova.model.serialization.View;
+
+@ConfigurationProperties(FeatureProperties.PREFIX)
+public class FeatureProperties {
+	public static final String PREFIX = "features";
+
+	public static class Contents {
+		private boolean enabled;
+		private int answerOptionLimit;
+
+		@JsonView(View.Public.class)
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+
+		@JsonView(View.Public.class)
+		public int getAnswerOptionLimit() {
+			return answerOptionLimit;
+		}
+
+		public void setAnswerOptionLimit(final int answerOptionLimit) {
+			this.answerOptionLimit = answerOptionLimit;
+		}
+	}
+
+	public static class Comments {
+		private boolean enabled;
+
+		@JsonView(View.Public.class)
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+	}
+
+	public static class LiveFeedback {
+		private boolean enabled;
+		private int resetInterval;
+
+		@JsonView(View.Public.class)
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+
+		public int getResetInterval() {
+			return resetInterval;
+		}
+
+		public void setResetInterval(final int resetInterval) {
+			this.resetInterval = resetInterval;
+		}
+	}
+
+	public static class ContentPool {
+		private boolean enabled;
+
+		@JsonView(View.Public.class)
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+	}
+
+	private Contents contents;
+	private Comments comments;
+	private LiveFeedback liveFeedback;
+	private ContentPool contentPool;
+
+	@JsonView(View.Public.class)
+	public Contents getContents() {
+		return contents;
+	}
+
+	public void setContents(final Contents contents) {
+		this.contents = contents;
+	}
+
+	@JsonView(View.Public.class)
+	public Comments getComments() {
+		return comments;
+	}
+
+	public void setComments(final Comments comments) {
+		this.comments = comments;
+	}
+
+	@JsonView(View.Public.class)
+	public LiveFeedback getLiveFeedback() {
+		return liveFeedback;
+	}
+
+	public void setLiveFeedback(final LiveFeedback liveFeedback) {
+		this.liveFeedback = liveFeedback;
+	}
+
+	@JsonView(View.Public.class)
+	public ContentPool getContentPool() {
+		return contentPool;
+	}
+
+	public void setContentPool(final ContentPool contentPool) {
+		this.contentPool = contentPool;
+	}
+}

src/main/java/de/thm/arsnova/events/PiRoundResetEvent.java → src/main/java/de/thm/arsnova/config/properties/MessageBrokerProperties.java

 /*
  * This file is part of ARSnova Backend.
- * Copyright (C) 2012-2017 The ARSnova Team
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
  *
  * ARSnova Backend is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,49 +15,70 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package de.thm.arsnova.events;
 
-import de.thm.arsnova.entities.Question;
-import de.thm.arsnova.entities.Session;
+package de.thm.arsnova.config.properties;
 
-import java.util.HashMap;
+import org.springframework.boot.context.properties.ConfigurationProperties;
 
-/**
- * Fires whenever a peer instruction round is reset.
- */
-public class PiRoundResetEvent extends SessionEvent {
+@ConfigurationProperties(MessageBrokerProperties.PREFIX)
+public class MessageBrokerProperties {
+	public static final String PREFIX = SystemProperties.PREFIX + ".message-broker";
 
-	private static final long serialVersionUID = 1L;
+	public static class Relay {
+		private boolean enabled;
+		private String host;
+		private int port;
+		private String username;
+		private String password;
 
-	private final String questionId;
-	private final String questionVariant;
+		public boolean isEnabled() {
+			return enabled;
+		}
 
-	public PiRoundResetEvent(Object source, Session session, Question question) {
-		super(source, session);
-		questionId = question.get_id();
-		questionVariant = question.getQuestionVariant();
-	}
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
 
-	@Override
-	public void accept(NovaEventVisitor visitor) {
-		visitor.visit(this);
-	}
+		public String getHost() {
+			return host;
+		}
 
-	public String getQuestionId() {
-		return questionId;
-	}
+		public void setHost(final String host) {
+			this.host = host;
+		}
 
-	public String getQuestionVariant() {
-		return questionVariant;
-	}
+		public int getPort() {
+			return port;
+		}
+
+		public void setPort(final int port) {
+			this.port = port;
+		}
 
-	public HashMap<String, String> getPiRoundResetInformations() {
-		HashMap<String, String> map = new HashMap<String, String>();
+		public String getUsername() {
+			return username;
+		}
 
-		map.put("_id", getQuestionId());
-		map.put("variant", getQuestionVariant());
+		public void setUsername(final String username) {
+			this.username = username;
+		}
 
-		return map;
+		public String getPassword() {
+			return password;
+		}
+
+		public void setPassword(final String password) {
+			this.password = password;
+		}
 	}
 
+	private Relay relay;
+
+	public Relay getRelay() {
+		return relay;
+	}
+
+	public void setRelay(final Relay relay) {
+		this.relay = relay;
+	}
 }

src/main/java/de/thm/arsnova/config/properties/SecurityProperties.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.config.properties;
+
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.convert.DurationUnit;
+
+@ConfigurationProperties(SecurityProperties.PREFIX)
+public class SecurityProperties {
+	public static final String PREFIX = "security";
+
+	public static class Jwt {
+		private String serverId;
+		private String secret;
+
+		@DurationUnit(ChronoUnit.MINUTES)
+		private Duration validityPeriod;
+
+		public String getServerId() {
+			return serverId;
+		}
+
+		public void setServerId(final String serverId) {
+			this.serverId = serverId;
+		}
+
+		public String getSecret() {
+			return secret;
+		}
+
+		public void setSecret(final String secret) {
+			this.secret = secret;
+		}
+
+		public Duration getValidityPeriod() {
+			return validityPeriod;
+		}
+
+		public void setValidityPeriod(final Duration validityPeriod) {
+			this.validityPeriod = validityPeriod;
+		}
+	}
+
+	private Jwt jwt;
+	private List<String> adminAccounts;
+	private int loginTryLimit;
+	private List<String> corsOrigins;
+
+	public Jwt getJwt() {
+		return jwt;
+	}
+
+	public void setJwt(final Jwt jwt) {
+		this.jwt = jwt;
+	}
+
+	public List<String> getAdminAccounts() {
+		return adminAccounts;
+	}
+
+	public void setAdminAccounts(final List<String> adminAccounts) {
+		this.adminAccounts = adminAccounts;
+	}
+
+	public int getLoginTryLimit() {
+		return loginTryLimit;
+	}
+
+	public void setLoginTryLimit(final int loginTryLimit) {
+		this.loginTryLimit = loginTryLimit;
+	}
+
+	public List<String> getCorsOrigins() {
+		return corsOrigins;
+	}
+
+	public void setCorsOrigins(final List<String> corsOrigins) {
+		this.corsOrigins = corsOrigins;
+	}
+}

src/main/java/de/thm/arsnova/config/properties/SystemProperties.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.config.properties;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@ConfigurationProperties(SystemProperties.PREFIX)
+public class SystemProperties {
+	public static final String PREFIX = "system";
+
+	public static class Api {
+		private String proxyPath;
+		private boolean indentResponseBody;
+		private boolean exposeErrorMessages;
+
+		public String getProxyPath() {
+			return proxyPath;
+		}
+
+		public void setProxyPath(final String proxyPath) {
+			this.proxyPath = proxyPath;
+		}
+
+		public boolean isIndentResponseBody() {
+			return indentResponseBody;
+		}
+
+		public void setIndentResponseBody(final boolean indentResponseBody) {
+			this.indentResponseBody = indentResponseBody;
+		}
+
+		public boolean isExposeErrorMessages() {
+			return exposeErrorMessages;
+		}
+
+		public void setExposeErrorMessages(final boolean exposeErrorMessages) {
+			this.exposeErrorMessages = exposeErrorMessages;
+		}
+	}
+
+	public static class Mail {
+		private String senderName;
+		private String senderAddress;
+		private String host;
+
+		public String getSenderName() {
+			return senderName;
+		}
+
+		public void setSenderName(final String senderName) {
+			this.senderName = senderName;
+		}
+
+		public String getSenderAddress() {
+			return senderAddress;
+		}
+
+		public void setSenderAddress(final String senderAddress) {
+			this.senderAddress = senderAddress;
+		}
+
+		public String getHost() {
+			return host;
+		}
+
+		public void setHost(final String host) {
+			this.host = host;
+		}
+	}
+
+	public static class LmsConnector {
+		private boolean enabled;
+		private String hostUrl;
+		private String username;
+		private String password;
+
+		public boolean isEnabled() {
+			return enabled;
+		}
+
+		public void setEnabled(final boolean enabled) {
+			this.enabled = enabled;
+		}
+
+		public String getHostUrl() {
+			return hostUrl;
+		}
+
+		public void setHostUrl(final String hostUrl) {
+			this.hostUrl = hostUrl;
+		}
+
+		public String getUsername() {
+			return username;
+		}
+
+		public void setUsername(final String username) {
+			this.username = username;
+		}
+
+		public String getPassword() {
+			return password;
+		}
+
+		public void setPassword(final String password) {
+			this.password = password;
+		}
+	}
+
+	public static class Socketio {
+		private String bindAddress;
+		private int port;
+		private String proxyPath;
+
+		public String getBindAddress() {
+			return bindAddress;
+		}
+
+		public void setBindAddress(final String bindAddress) {
+			this.bindAddress = bindAddress;
+		}
+
+		public int getPort() {
+			return port;
+		}
+
+		public void setPort(final int port) {
+			this.port = port;
+		}
+
+		public String getProxyPath() {
+			return proxyPath;
+		}
+
+		public void setProxyPath(final String proxyPath) {
+			this.proxyPath = proxyPath;
+		}
+	}
+
+	private String rootUrl;
+	private Api api;
+	private Mail mail;
+	private LmsConnector lmsConnector;
+	private Socketio socketio;
+
+	public String getRootUrl() {
+		return rootUrl;
+	}
+
+	public void setRootUrl(final String rootUrl) {
+		this.rootUrl = rootUrl;
+	}
+
+	public Api getApi() {
+		return api;
+	}
+
+	public void setApi(final Api api) {
+		this.api = api;
+	}
+
+	public Mail getMail() {
+		return mail;
+	}
+
+	public void setMail(final Mail mail) {
+		this.mail = mail;
+	}
+
+	public LmsConnector getLmsConnector() {
+		return lmsConnector;
+	}
+
+	public void setLmsConnector(final LmsConnector lmsConnector) {
+		this.lmsConnector = lmsConnector;
+	}
+
+	public Socketio getSocketio() {
+		return socketio;
+	}
+
+	public void setSocketio(final Socketio socketio) {
+		this.socketio = socketio;
+	}
+}

src/main/java/de/thm/arsnova/config/properties/UiProperties.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.config.properties;
+
+import java.util.Map;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@ConfigurationProperties
+public class UiProperties {
+	private Map<String, Object> ui;
+
+	public Map<String, Object> getUi() {
+		return ui;
+	}
+
+	public void setUi(final Map<String, Object> ui) {
+		this.ui = ui;
+	}
+}

src/main/java/de/thm/arsnova/controller/AbstractController.java

 /*
  * This file is part of ARSnova Backend.
- * Copyright (C) 2012-2017 The ARSnova Team
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
  *
  * ARSnova Backend is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,6 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 package de.thm.arsnova.controller;
 
 /**

src/main/java/de/thm/arsnova/events/DeleteInterposedQuestionEvent.java → src/main/java/de/thm/arsnova/controller/AnswerController.java

 /*
  * This file is part of ARSnova Backend.
- * Copyright (C) 2012-2017 The ARSnova Team
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
  *
  * ARSnova Backend is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,32 +15,29 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package de.thm.arsnova.events;
 
-import de.thm.arsnova.entities.InterposedQuestion;
-import de.thm.arsnova.entities.Session;
+package de.thm.arsnova.controller;
 
-/**
- * Fires whenever an interposed question is deleted.
- */
-public class DeleteInterposedQuestionEvent extends SessionEvent {
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
 
-	private static final long serialVersionUID = 1L;
+import de.thm.arsnova.model.Answer;
+import de.thm.arsnova.service.AnswerService;
 
-	private final InterposedQuestion question;
+@RestController
+@RequestMapping(AnswerController.REQUEST_MAPPING)
+public class AnswerController extends AbstractEntityController<Answer> {
+	protected static final String REQUEST_MAPPING = "/answer";
 
-	public DeleteInterposedQuestionEvent(Object source, Session session, InterposedQuestion question) {
-		super(source, session);
-		this.question = question;
-	}
+	private AnswerService answerService;
 
-	@Override
-	public void accept(NovaEventVisitor visitor) {
-		visitor.visit(this);
+	public AnswerController(final AnswerService answerService) {
+		super(answerService);
+		this.answerService = answerService;
 	}
 
-	public InterposedQuestion getQuestion() {
-		return question;
+	@Override
+	protected String getMapping() {
+		return REQUEST_MAPPING;
 	}
-
 }

src/main/java/de/thm/arsnova/events/NewInterposedQuestionEvent.java → src/main/java/de/thm/arsnova/controller/CommentController.java

 /*
  * This file is part of ARSnova Backend.
- * Copyright (C) 2012-2017 The ARSnova Team
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
  *
  * ARSnova Backend is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,32 +15,29 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package de.thm.arsnova.events;
 
-import de.thm.arsnova.entities.InterposedQuestion;
-import de.thm.arsnova.entities.Session;
+package de.thm.arsnova.controller;
 
-/**
- * Fires whenever a new interposed (aka. feedback or audience) question is added.
- */
-public class NewInterposedQuestionEvent extends SessionEvent {
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
 
-	private static final long serialVersionUID = 1L;
+import de.thm.arsnova.model.Comment;
+import de.thm.arsnova.service.CommentService;
 
-	private final InterposedQuestion question;
+@RestController
+@RequestMapping(CommentController.REQUEST_MAPPING)
+public class CommentController extends AbstractEntityController<Comment> {
+	protected static final String REQUEST_MAPPING = "/comment";
 
-	public NewInterposedQuestionEvent(Object source, Session session, InterposedQuestion question) {
-		super(source, session);
-		this.question = question;
-	}
+	private CommentService commentService;
 
-	public InterposedQuestion getQuestion() {
-		return question;
+	public CommentController(final CommentService commentService) {
+		super(commentService);
+		this.commentService = commentService;
 	}
 
 	@Override
-	public void accept(NovaEventVisitor visitor) {
-		visitor.visit(this);
+	protected String getMapping() {
+		return REQUEST_MAPPING;
 	}
-
 }