diff --git a/openvidu-sample-app/.gitignore b/openvidu-sample-app/.gitignore
new file mode 100644
index 00000000..a37e8ea7
--- /dev/null
+++ b/openvidu-sample-app/.gitignore
@@ -0,0 +1,255 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+backend/openvidu-sample-app/target/*
+backend/openvidu-sample-app/src/main/resources/static/*
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.pfx
+*.publishsettings
+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
diff --git a/openvidu-sample-app/BuildFrontWarAndRun.sh b/openvidu-sample-app/BuildFrontWarAndRun.sh
new file mode 100755
index 00000000..8a2e64af
--- /dev/null
+++ b/openvidu-sample-app/BuildFrontWarAndRun.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+cd frontend
+ng build --output-path ./../backend/openvidu-sample-app/src/main/resources/static
+cd ../backend/openvidu-sample-app
+mvn clean package
+java -jar target/openvidu-sample-app-0.0.1-SNAPSHOT.war
diff --git a/openvidu-sample-app/LICENSE b/openvidu-sample-app/LICENSE
new file mode 100644
index 00000000..8dada3ed
--- /dev/null
+++ b/openvidu-sample-app/LICENSE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
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+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+ 9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+ END OF TERMS AND CONDITIONS
+
+ APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "{}"
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+ Licensed 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
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+ 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.
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/.gitignore b/openvidu-sample-app/backend/openvidu-sample-app/.gitignore
new file mode 100644
index 00000000..b83d2226
--- /dev/null
+++ b/openvidu-sample-app/backend/openvidu-sample-app/.gitignore
@@ -0,0 +1 @@
+/target/
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/pom.xml b/openvidu-sample-app/backend/openvidu-sample-app/pom.xml
new file mode 100644
index 00000000..c059c918
--- /dev/null
+++ b/openvidu-sample-app/backend/openvidu-sample-app/pom.xml
@@ -0,0 +1,126 @@
+
+ 4.0.0
+
+ openvidu
+ openvidu-sample-app
+ 0.0.1-SNAPSHOT
+ war
+
+ openvidu-sample-app
+ http://maven.apache.org
+
+
+ org.springframework.boot
+ spring-boot-starter-parent
+ 1.4.1.RELEASE
+
+
+
+ UTF-8
+ 1.8
+ openvidu.openvidu_sample_app.App
+
+
+
+
+ ${project.artifactId}-${project.version}
+
+
+
+
+ org.springframework.boot
+ spring-boot-maven-plugin
+
+
+
+ org.springframework
+ springloaded
+ 1.2.6.RELEASE
+
+
+
+
+
+
+ org.codehaus.mojo
+ exec-maven-plugin
+
+ ${start-class}
+
+
+
+
+ maven-war-plugin
+
+
+
+ src/main/ebextensions
+ .ebextensions
+ true
+
+
+
+
+
+
+
+
+
+
+
+ junit
+ junit
+ test
+
+
+
+ org.springframework.boot
+ spring-boot-starter-web
+
+
+
+ org.springframework.boot
+ spring-boot-starter-data-jpa
+
+
+
+ org.springframework.boot
+ spring-boot-starter-security
+
+
+
+ org.springframework.boot
+ spring-boot-devtools
+
+
+
+ mysql
+ mysql-connector-java
+
+
+
+ commons-validator
+ commons-validator
+ 1.5.1
+
+
+
+ org.springframework.boot
+ spring-boot-starter-websocket
+
+
+
+ com.googlecode.json-simple
+ json-simple
+
+
+
+ org.apache.httpcomponents
+ httpclient
+ 4.5
+
+
+
+
+
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/src/main/ebextensions/configuration.config b/openvidu-sample-app/backend/openvidu-sample-app/src/main/ebextensions/configuration.config
new file mode 100644
index 00000000..e69de29b
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/App.java b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/App.java
new file mode 100644
index 00000000..c49bf1ea
--- /dev/null
+++ b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/App.java
@@ -0,0 +1,30 @@
+package openvidu.openvidu_sample_app;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.socket.config.annotation.EnableWebSocket;
+
+@SpringBootApplication
+@EnableWebSocket
+public class App
+{
+ public static void main( String[] args )
+ {
+ SpringApplication.run(App.class, args);
+ }
+
+ @Bean
+ public WebMvcConfigurer corsConfigurer() {
+ return new WebMvcConfigurerAdapter() {
+ @Override
+ public void addCorsMappings(CorsRegistry registry) {
+ registry.addMapping("/**").allowedOrigins("*");
+ }
+ };
+ }
+
+}
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/DatabaseInitializer.java b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/DatabaseInitializer.java
new file mode 100644
index 00000000..33660b0b
--- /dev/null
+++ b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/DatabaseInitializer.java
@@ -0,0 +1,50 @@
+package openvidu.openvidu_sample_app;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Controller;
+
+import openvidu.openvidu_sample_app.user.UserRepository;
+import openvidu.openvidu_sample_app.user.User;
+import openvidu.openvidu_sample_app.lesson.LessonRepository;
+import openvidu.openvidu_sample_app.lesson.Lesson;
+
+@Controller
+public class DatabaseInitializer implements CommandLineRunner {
+
+ @Autowired
+ private UserRepository userRepository;
+
+ @Autowired
+ private LessonRepository lessonRepository;
+
+ @Override
+ public void run(String... args) throws Exception {
+
+ //Sample users
+ User user1 = new User("student1@gmail.com", "pass", "Student Imprudent", "ROLE_STUDENT");
+ User user2 = new User("student2@gmail.com", "pass", "Student Concludent", "ROLE_STUDENT");
+ User user3 = new User("teacher@gmail.com", "pass", "Teacher Cheater", "ROLE_TEACHER");
+
+ //Saving users
+ userRepository.save(user1);
+ userRepository.save(user2);
+ userRepository.save(user3);
+
+ //Sample lessons
+ Lesson c1 = new Lesson("Lesson number 1", user3);
+ Lesson c2 = new Lesson("Lesson number 2", user3);
+
+ c1.getAttenders().add(user1);
+ c1.getAttenders().add(user2);
+ c1.getAttenders().add(user3);
+
+ c2.getAttenders().add(user1);
+ c2.getAttenders().add(user3);
+
+ //Saving lessons
+ lessonRepository.save(c1);
+ lessonRepository.save(c2);
+ }
+
+}
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/lesson/Lesson.java b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/lesson/Lesson.java
new file mode 100644
index 00000000..0dac94ad
--- /dev/null
+++ b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/lesson/Lesson.java
@@ -0,0 +1,84 @@
+package openvidu.openvidu_sample_app.lesson;
+
+import java.util.Set;
+import java.util.HashSet;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import javax.persistence.ManyToOne;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import openvidu.openvidu_sample_app.user.User;
+
+@Entity
+public class Lesson {
+
+ public interface SimpleCourseList {}
+
+ @Id
+ @GeneratedValue(strategy = GenerationType.AUTO)
+ @JsonView(SimpleCourseList.class)
+ private long id;
+
+ @JsonView(SimpleCourseList.class)
+ private String title;
+
+ @ManyToOne
+ private User teacher;
+
+ @ManyToMany
+ private Set attenders;
+
+ public Lesson() {}
+
+ public Lesson(String title, User teacher) {
+ this.title = title;
+ this.teacher = teacher;
+ this.attenders = new HashSet<>();
+ }
+
+ public long getId() {
+ return id;
+ }
+
+ public void setId(long id) {
+ this.id = id;
+ }
+
+ public String getTitle() {
+ return title;
+ }
+
+ public void setTitle(String title) {
+ this.title = title;
+ }
+
+ public User getTeacher() {
+ return teacher;
+ }
+
+ public void setTeacher(User teacher) {
+ this.teacher = teacher;
+ }
+
+ public Set getAttenders() {
+ return attenders;
+ }
+
+ public void setAttenders(Set attenders) {
+ this.attenders = attenders;
+ }
+
+ //To make 'user.getLesson().remove(lesson)' possible
+ @Override
+ public boolean equals(Object other){
+ if (other == null) return false;
+ if (other == this) return true;
+ if (!(other instanceof Lesson))return false;
+ Lesson otherCourse = (Lesson)other;
+ return (otherCourse.id == this.id);
+ }
+}
diff --git a/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/lesson/LessonController.java b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/lesson/LessonController.java
new file mode 100644
index 00000000..240cb944
--- /dev/null
+++ b/openvidu-sample-app/backend/openvidu-sample-app/src/main/java/openvidu/openvidu_sample_app/lesson/LessonController.java
@@ -0,0 +1,299 @@
+package openvidu.openvidu_sample_app.lesson;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.commons.validator.routines.EmailValidator;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import openvidu.openvidu_sample_app.user.User;
+import openvidu.openvidu_sample_app.user.UserComponent;
+import openvidu.openvidu_sample_app.user.UserRepository;
+
+@RestController
+@RequestMapping("/api-lessons")
+public class LessonController {
+
+ @Autowired
+ private LessonRepository lessonRepository;
+
+ @Autowired
+ private UserRepository userRepository;
+
+ @Autowired
+ private UserComponent user;
+
+ private class AddAttendersResponse {
+ public Collection attendersAdded;
+ public Collection attendersAlreadyAdded;
+ public Collection emailsInvalid;
+ public Collection emailsValidNotRegistered;
+ }
+
+ @RequestMapping(value = "/user/{id}", method = RequestMethod.GET)
+ public ResponseEntity> getLessons(@PathVariable(value="id") String id){
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ long id_i = -1;
+ try{
+ id_i = Long.parseLong(id);
+ }catch(NumberFormatException e){
+ return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+ }
+ Set s = new HashSet<>();
+ s.add(id_i);
+ Collection users = userRepository.findAll(s);
+ Collection lessons = new HashSet<>();
+ lessons = lessonRepository.findByAttenders(users);
+ return new ResponseEntity<>(lessons ,HttpStatus.OK);
+ }
+
+
+
+ @RequestMapping(value = "/lesson/{id}", method = RequestMethod.GET)
+ public ResponseEntity getLesson(@PathVariable(value="id") String id){
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ long id_i = -1;
+ try{
+ id_i = Long.parseLong(id);
+ }catch(NumberFormatException e){
+ return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+ }
+ Lesson lesson = lessonRepository.findOne(id_i);
+ return new ResponseEntity<>(lesson ,HttpStatus.OK);
+ }
+
+
+
+ @RequestMapping(value = "/new", method = RequestMethod.POST)
+ public ResponseEntity newLesson(@RequestBody Lesson lesson) {
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ User userLogged = user.getLoggedUser();
+
+ if (!user.hasRoleTeacher()){
+ // Students are not authorized to add new lessons
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ // Updating lesson ('teacher', 'attenders')
+ lesson.setTeacher(userLogged);
+ lesson.getAttenders().add(userLogged);
+
+ // Saving lesson
+ lessonRepository.save(lesson);
+ lessonRepository.flush();
+
+ lesson = lessonRepository.findOne(lesson.getId());
+ return new ResponseEntity<>(lesson, HttpStatus.CREATED);
+ }
+
+
+
+ @RequestMapping(value = "/edit", method = RequestMethod.PUT)
+ public ResponseEntity modifyLesson(@RequestBody Lesson lesson) {
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ Lesson c = lessonRepository.findOne(lesson.getId());
+
+ checkAuthorization(c, c.getTeacher());
+
+ //Modifying the lesson attributes
+ c.setTitle(lesson.getTitle());
+
+ //Saving the modified lesson
+ lessonRepository.save(c);
+ return new ResponseEntity<>(c, HttpStatus.OK);
+ }
+
+
+
+ @RequestMapping(value = "/delete/{lessonId}", method = RequestMethod.DELETE)
+ public ResponseEntity deleteLesson(@PathVariable(value="lessonId") String lessonId) {
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ long id_lesson = -1;
+ try{
+ id_lesson = Long.parseLong(lessonId);
+ }catch(NumberFormatException e){
+ return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+ }
+
+ Lesson c = lessonRepository.findOne(id_lesson);
+
+ checkAuthorization(c, c.getTeacher());
+
+ //Removing the deleted lesson from its attenders
+ Collection lessons = new HashSet<>();
+ lessons.add(c);
+ Collection users = userRepository.findByLessons(lessons);
+ for(User u: users){
+ u.getLessons().remove(c);
+ }
+ userRepository.save(users);
+ c.getAttenders().clear();
+
+ lessonRepository.delete(c);
+ return new ResponseEntity<>(c, HttpStatus.OK);
+ }
+
+
+
+ @RequestMapping(value = "/edit/add-attenders/lesson/{lessonId}", method = RequestMethod.PUT)
+ public ResponseEntity addAttenders(
+ @RequestBody String[] attenderEmails,
+ @PathVariable(value="lessonId") String lessonId)
+ {
+
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ long id_lesson = -1;
+ try{
+ id_lesson = Long.parseLong(lessonId);
+ }catch(NumberFormatException e){
+ return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+ }
+
+ Lesson c = lessonRepository.findOne(id_lesson);
+
+ checkAuthorization(c, c.getTeacher());
+
+ //Strings with a valid email format
+ Set attenderEmailsValid = new HashSet<>();
+ //Strings with an invalid email format
+ Set attenderEmailsInvalid = new HashSet<>();
+ //Strings with a valid email format but no registered in the application
+ Set attenderEmailsNotRegistered = new HashSet<>();
+
+ EmailValidator emailValidator = EmailValidator.getInstance();
+
+ for (int i = 0; i < attenderEmails.length; i++){
+ if (emailValidator.isValid(attenderEmails[i])) {
+ attenderEmailsValid.add(attenderEmails[i]);
+ } else {
+ attenderEmailsInvalid.add(attenderEmails[i]);
+ }
+ }
+
+ Collection newPossibleAttenders = userRepository.findByNameIn(attenderEmailsValid);
+ Collection newAddedAttenders = new HashSet<>();
+ Collection alreadyAddedAttenders = new HashSet<>();
+
+ for (String s : attenderEmailsValid){
+ if (!this.userListContainsEmail(newPossibleAttenders, s)){
+ attenderEmailsNotRegistered.add(s);
+ }
+ }
+
+ for (User attender : newPossibleAttenders){
+ boolean newAtt = true;
+ if (!attender.getLessons().contains(c)) attender.getLessons().add(c); else newAtt = false;
+ if (!c.getAttenders().contains(attender)) c.getAttenders().add(attender); else newAtt = false;
+ if (newAtt) newAddedAttenders.add(attender); else alreadyAddedAttenders.add(attender);
+ }
+
+ //Saving the attenders (all of them, just in case a field of the bidirectional relationship is missing in a Lesson or a User)
+ userRepository.save(newPossibleAttenders);
+ //Saving the modified lesson
+ lessonRepository.save(c);
+
+ AddAttendersResponse customResponse = new AddAttendersResponse();
+ customResponse.attendersAdded = newAddedAttenders;
+ customResponse.attendersAlreadyAdded = alreadyAddedAttenders;
+ customResponse.emailsInvalid = attenderEmailsInvalid;
+ customResponse.emailsValidNotRegistered = attenderEmailsNotRegistered;
+
+ return new ResponseEntity<>(customResponse, HttpStatus.OK);
+ }
+
+
+
+ @RequestMapping(value = "/edit/delete-attenders", method = RequestMethod.PUT)
+ public ResponseEntity> deleteAttenders(@RequestBody Lesson lesson) {
+ if (!this.userIsLogged()){
+ return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
+ }
+
+ Lesson c = lessonRepository.findOne(lesson.getId());
+
+ checkAuthorization(c, c.getTeacher());
+
+ Set setLesson = new HashSet<>();
+ setLesson.add(c);
+ Collection lessonAttenders = userRepository.findByLessons(setLesson);
+
+ for (User attender : lessonAttenders){
+ if (!lesson.getAttenders().contains(attender)){
+ attender.getLessons().remove(c);
+ }
+ }
+
+ userRepository.save(lessonAttenders);
+
+ //Modifying the lesson attenders
+ c.setAttenders(lesson.getAttenders());
+ //Saving the modified lesson
+ lessonRepository.save(c);
+ return new ResponseEntity<>(c.getAttenders(), HttpStatus.OK);
+ }
+
+
+ //Login checking method for the backend
+ private boolean userIsLogged(){
+ if (!user.isLoggedUser()) {
+ System.out.println("Not user logged");
+ return false;
+ }
+ return true;
+ }
+
+ //Authorization checking for editing and deleting lessons (the teacher must own the Lesson)
+ private ResponseEntity