Merge pull request 'Nowa funkcjonalność: wymiana-przedmiotami' (#41) from wymiana-przedmiotami into master

Reviewed-on: http://git.plannaplan.pl/filipizydorczyk/backend/pulls/41

README.md

@@ -17,10 +17,22 @@ mvn spring-boot:run
 
 Żeby tesotwać API wpełni potrzebny nam jest token który otrzymujemy na podstawie ticketa z systemu autoryzacyjnego **CAS**. Z tego powodu system autoryzacji działa inaczej niż w "książkowych" restowych aplikacjach i np Postman za nas jej nie dokona. Musimy mu podać już uzyskany token. Aby łatwo go uzyskać odpal skrypt
 
-```
+```bash
 python gettoken.py
 ```
 
+Jeżeli chcesz używać skryptu zmiejaniąc gdzie znajduje się backend wpisz:
+
+```bash
+python gettoken.py 192.168.0.212
+```
+
+Jeżeli chcesz używać skryptu bez uruchamiania przeglądarki wpisz:
+
+```bash
+python gettoken.py no-browser
+```
+
 Na koniec w przęglądarce dostaniesz w odpowiedzi token. W samym pliku można zmienić porty aplikacji jeśli to potrzebne.
 
 # Profiles

buisnesslogic/src/main/java/com/plannaplan/entities/Assignment.java

@@ -47,6 +47,14 @@ public class Assignment {
         return this.group.getRegisteredStudents().contains(this.commision.getCommisionOwner());
     }
 
+    /**
+     * Getter of commision
+     * @return Commision Commision of given assignments
+     */
+    public Commision getCommision(){
+        return this.commision;
+    }
+
     /**
      * Assignment
      *
@@ -60,6 +68,9 @@ public class Assignment {
     public Assignment() {
     }
 
+    public void setCommision(Commision commision) {
+	this.commision = commision;
+    }
     /**
      * Id getter
      *

buisnesslogic/src/main/java/com/plannaplan/entities/Exchange.java

@@ -0,0 +1,102 @@
+package com.plannaplan.entities;
+
+import java.sql.Timestamp;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToOne;
+
+/**
+ * Entity that keeps user exchange offer.
+ */
+@Entity
+public class Exchange {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @OneToOne
+    @JoinColumn(name = "owned_id")
+    private Assignment ownedAssignment;
+
+    @OneToOne
+    @JoinColumn(name = "desired_id")
+    private Groups desiredAssignment;
+
+    private Long ownerId;
+
+    private Timestamp dateExchange;
+
+    public Exchange(){
+
+    }
+
+    /**
+     * @return Long ID of exchange trader
+     */
+    public Long getOwnerId() {
+        return ownerId;
+    }
+
+    /**
+     * @param ownerId ID of exchange trader
+     */
+    public void setOwnerId(Long ownerId) {
+        this.ownerId = ownerId;
+    }
+
+    public Timestamp getDataExchange() {
+	return this.dateExchange;
+    }
+
+    /**
+     *
+     * @param ownedAssignment  Assignment which owner would like to trade
+     * @param desiredAssignment Groups instance that trader wants
+     */
+    public Exchange(Assignment ownedAssignment, Groups desiredAssignment) {
+        this.ownedAssignment = ownedAssignment;
+        this.desiredAssignment = desiredAssignment;
+	this.ownerId = this.ownedAssignment != null ? this.ownedAssignment.getCommision().getCommisionOwner().getId() : null;
+	this.dateExchange = new Timestamp(System.currentTimeMillis());
+    }
+
+    /**
+     * @return Long ID in database
+     */
+    public Long getId(){
+        return this.id;
+    }
+
+    /**
+     * @return Groups Target group
+     */
+    public Groups getDesiredAssignment() {
+        return desiredAssignment;
+    }
+
+    /**
+     * @param desiredAssignment Target group
+     */
+    public void setDesiredAssignment(Groups desiredAssignment) {
+        this.desiredAssignment = desiredAssignment;
+    }
+
+    /**
+     * @return Assignment Owned assignment
+     */
+    public Assignment getOwnedAssignment() {
+        return ownedAssignment;
+    }
+
+    /**
+     * @param ownedAssignment Owned assignment
+     */
+    public void setOwnedAssignment(Assignment ownedAssignment) {
+        this.ownedAssignment = ownedAssignment;
+    }
+}

buisnesslogic/src/main/java/com/plannaplan/entities/User.java

@@ -47,6 +47,11 @@ public class User {
         return this.studentRegisteredGrups;
     }
 
+    public void removeGroup(Long id) {
+	final Groups groupToDelete = this.studentRegisteredGrups.stream().filter(e -> e.getId().equals(id)).findFirst().get();
+	this.studentRegisteredGrups.remove(groupToDelete);
+    }
+
     public void claimGroup(Groups group) {
         if (this.studentRegisteredGrups == null) {
             this.studentRegisteredGrups = new HashSet<>();

buisnesslogic/src/main/java/com/plannaplan/models/EmailExchangesData.java

@@ -0,0 +1,45 @@
+package com.plannaplan.models;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.User;
+
+/**
+ * Class to keepm data to be send after exchanges being accept
+ */
+public class EmailExchangesData {
+    private Map<Long, List<Exchange>> data;
+
+    public EmailExchangesData() {
+        this.data = new HashMap<>();
+    }
+
+    /**
+     * method to add user and his event to data to be send
+     * 
+     * @param user owner of exchange being performed
+     * @param data exchange that was executed
+     */
+    public void addExchange(User user, Exchange data) {
+        final Long id = user.getId();
+        if (this.data.get(id) == null) {
+            this.data.put(id, new ArrayList<>());
+        }
+        this.data.get(id).add(data);
+    }
+
+    /**
+     * get datas entry set
+     * 
+     * @return set with entries that contains Long that is user id and list of hiss
+     *         performed Exchanges
+     */
+    public Set<Map.Entry<Long, List<Exchange>>> getDataEntry() {
+        return this.data.entrySet();
+    }
+}

buisnesslogic/src/main/java/com/plannaplan/models/MatchData.java

@@ -0,0 +1,66 @@
+package com.plannaplan.models;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Exchange;
+
+public class MatchData {
+    private Exchange exchangeOne;
+    private Exchange exchangeTwo;
+
+    public MatchData(Exchange exchangeOne, Exchange exchangeTwo) {
+	this.exchangeOne = exchangeOne;
+	this.exchangeTwo = exchangeTwo;
+    }
+
+    public Exchange getExchangeOne() {
+	return this.exchangeOne;
+    }
+
+    public Exchange getExchangeTwo() {
+	return this.exchangeTwo;
+    }
+
+    public Assignment getAssignmentTwo() {
+	return this.exchangeTwo.getOwnedAssignment();
+    }
+
+    public Assignment getAssignmentOne() {
+	return this.exchangeOne.getOwnedAssignment();
+    }
+
+    @Override
+    public int hashCode() {
+	return this.getAssignmentOne().hashCode() + this.getAssignmentTwo().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+
+	// If the object is compared with itself then return true
+	if (o == this) {
+	    return true;
+	}
+
+	/*
+	 * Check if o is an instance of Complex or not "null instanceof [type]" also
+	 * returns false
+	 */
+	if (!(o instanceof MatchData)) {
+	    return false;
+	}
+
+	// typecast o to Complex so that we can compare data members
+	MatchData c = (MatchData) o;
+
+	// Compare the data members and return accordingly
+	return (this.getAssignmentOne().equals(c.getAssignmentOne()) && this.getAssignmentTwo().equals(c.getAssignmentTwo())) || (this.getAssignmentOne().equals(c.getAssignmentTwo()) && this.getAssignmentTwo().equals(c.getAssignmentOne()));
+    }
+
+    public int compare(MatchData m1) {
+	return Long.compare(m1.getExchangesMsValue(), this.getExchangesMsValue());
+    }
+
+    public long getExchangesMsValue(){
+	return this.exchangeOne.getDataExchange().getTime() + this.exchangeTwo.getDataExchange().getTime();
+    }
+}

buisnesslogic/src/main/java/com/plannaplan/repositories/ExchangeRepository.java

@@ -0,0 +1,26 @@
+package com.plannaplan.repositories;
+
+import java.util.List;
+import java.util.Optional;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.Groups;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface ExchangeRepository extends JpaRepository<Exchange, Long>{
+
+    @Query("FROM Exchange WHERE owned_id = ?1 AND desired_id = ?2")
+    Optional<Exchange> checkForExchange(@Param("owned_id") Assignment assignment, @Param("desired_id") Groups group);
+
+    @Query("FROM Exchange WHERE ownerId = ?1")
+    List<Exchange> getByUserId(@Param("id") Long id);
+
+    @Query("Select e1,e2 FROM Exchange e1, Exchange e2 WHERE e1.ownedAssignment.group.id = e2.desiredAssignment.id")
+    List<Object[]> getMatches();
+}

buisnesslogic/src/main/java/com/plannaplan/services/EmailService.java

@@ -1,7 +1,13 @@
 package com.plannaplan.services;
 
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import com.plannaplan.entities.Exchange;
 import com.plannaplan.entities.User;
 import com.plannaplan.models.EmailAcceptedData;
+import com.plannaplan.models.EmailExchangesData;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
@@ -18,6 +24,9 @@ public class EmailService {
     @Autowired
     private JavaMailSender emailSender;
 
+    @Autowired
+    private UserService userService;
+
     @Value("${plannaplan.email}")
     private String appEmail;
 
@@ -54,4 +63,39 @@ public class EmailService {
         mailMessage.setText(data.getEmailMessage());
         emailSender.send(mailMessage);
     }
+
+    /**
+     * method to send email for students whose groups were swaped
+     * 
+     * @param data EmailExchangesData instance that contains pair of datas user and
+     *             list of performed exhanges
+     */
+    public void sendExchangesResults(EmailExchangesData data) {
+        for (Map.Entry<Long, List<Exchange>> entry : data.getDataEntry()) {
+            final User user = this.userService.getById(entry.getKey()).get();
+            String response = "Znaleźliśmy dla Ciebie osobę, która zamieniła się z Tobą przedmiotami!!!\n Zamienione przedmioty: \n";
+
+            final Iterator<Exchange> interator = entry.getValue().iterator();
+
+            while (interator.hasNext()) {
+                final Exchange exchange = interator.next();
+                final String courseFrom = exchange.getDesiredAssignment().getCourseId() != null
+                        ? exchange.getDesiredAssignment().getCourseId().getName()
+                        : "Nieznane zajęcie";
+                final String courseTo = exchange.getOwnedAssignment().getGroup().getCourseId() != null
+                        ? exchange.getOwnedAssignment().getGroup().getCourseId().getName()
+                        : "Nieznane zajęcie";
+
+                response += (" - " + courseFrom + " za " + courseTo.toLowerCase());
+            }
+
+            SimpleMailMessage mailMessage = new SimpleMailMessage();
+            mailMessage.setFrom(appEmail);
+            mailMessage.setTo(user.getEmail());
+            mailMessage.setSubject("[PlanNaPlan] Zamiana przedmiotów");
+            mailMessage.setText(response);
+            emailSender.send(mailMessage);
+
+        }
+    }
 }

buisnesslogic/src/main/java/com/plannaplan/services/EventService.java

@@ -6,6 +6,7 @@ import java.util.concurrent.ScheduledFuture;
 
 import javax.annotation.PostConstruct;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
 import org.springframework.scheduling.support.CronTrigger;
@@ -14,6 +15,9 @@ import org.springframework.stereotype.Service;
 @Service
 public class EventService {
 
+    @Autowired
+    private ExchangeService exchangeService;
+
     public static final int FIRST_TOUR_SCHEDULE = 0;
     public static final int SECOND_TOUR_SCHEDULE = 1;
 
@@ -25,6 +29,12 @@ public class EventService {
         System.out.println("Checking for groups");
     }
 
+    @Scheduled(cron = "0 0 0 * * *")
+    public void performExchangeService() {
+        System.out.println("Performing Exchange");
+        this.exchangeService.performExchange();
+    }
+
     /**
      * Schedule provided task to perform
      *

buisnesslogic/src/main/java/com/plannaplan/services/ExchangeService.java

@@ -0,0 +1,143 @@
+package com.plannaplan.services;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Commision;
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.Groups;
+import com.plannaplan.entities.User;
+import com.plannaplan.models.EmailExchangesData;
+import com.plannaplan.models.MatchData;
+import com.plannaplan.repositories.ExchangeRepository;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ExchangeService {
+
+    @Autowired
+    private ExchangeRepository repo;
+
+    @Autowired
+    private AssignmentService assignmentService;
+
+    @Autowired
+    private UserService userService;
+
+    @Autowired
+    private EmailService emailService;
+
+    /**
+     * @param exchange Instance to save in database
+     * @return Exchange Instance contains database id
+     */
+    public Exchange save(Exchange exchange) {
+        return this.repo.save(exchange);
+    }
+
+    /**
+     * @param id Id of exchange in database
+     * @return Optional Exchange if found
+     */
+    public Optional<Exchange> getById(Long id) {
+        return this.repo.findById(id);
+    }
+
+    public List<Exchange> getAllExchanges() {
+        return this.repo.findAll();
+    }
+
+    /**
+     * @param id Id of user
+     * @return List of exchanges that belong to user
+     */
+    public List<Exchange> getByUserId(Long id) {
+        return this.repo.getByUserId(id);
+    }
+
+    /**
+     * @param entity Exchange entity which we would like to delete
+     */
+    public void deleteExchange(Exchange entity) {
+        this.repo.delete(entity);
+    }
+
+    /**
+     * @param assignment Assignment to trade for
+     * @param group      Desired group
+     * @return Optional with Exchange if exist
+     */
+    public Optional<Exchange> checkForExchange(Assignment assignment, Groups group) {
+        return this.repo.checkForExchange(assignment, group);
+    }
+
+    public void performExchange() {
+        final List<MatchData> matchData = this.getMatches();
+        final List<Long> performedAssignmentExchanges = new ArrayList<>();
+        final EmailExchangesData emailData = new EmailExchangesData();
+        final List<Exchange> exchangesToDelete = new ArrayList<>();
+
+        matchData.forEach(m -> {
+            final Assignment assignmentOne = m.getAssignmentOne();
+            final Assignment assignmentTwo = m.getAssignmentTwo();
+
+            final Exchange exchange1 = m.getExchangeOne();
+            final Exchange exchange2 = m.getExchangeTwo();
+
+            if (!(performedAssignmentExchanges.contains(assignmentOne.getId())
+                    || performedAssignmentExchanges.contains(assignmentTwo.getId()))) {
+                final Commision commisionOne = assignmentOne.getCommision();
+                final User userOne = commisionOne.getCommisionOwner();
+                final Commision commisionTwo = assignmentTwo.getCommision();
+                final User userTwo = commisionTwo.getCommisionOwner();
+
+                assignmentOne.setCommision(commisionTwo);
+                assignmentTwo.setCommision(commisionOne);
+
+                userOne.removeGroup(assignmentOne.getGroup().getId());
+                userTwo.removeGroup(assignmentTwo.getGroup().getId());
+
+                userOne.claimGroup(assignmentTwo.getGroup());
+                userTwo.claimGroup(assignmentOne.getGroup());
+
+                this.assignmentService.save(assignmentOne);
+                this.assignmentService.save(assignmentTwo);
+
+                this.userService.save(userOne);
+                this.userService.save(userTwo);
+
+                performedAssignmentExchanges.add(assignmentOne.getId());
+                performedAssignmentExchanges.add(assignmentTwo.getId());
+
+                emailData.addExchange(exchange1.getOwnedAssignment().getCommision().getCommisionOwner(), exchange1);
+                emailData.addExchange(exchange2.getOwnedAssignment().getCommision().getCommisionOwner(), exchange2);
+            }
+
+            exchangesToDelete.add(exchange1);
+            exchangesToDelete.add(exchange2);
+        });
+        this.emailService.sendExchangesResults(emailData);
+        this.repo.deleteAll(exchangesToDelete);
+    }
+
+    public List<MatchData> getMatches() {
+        final List<MatchData> matches = this.repo.getMatches().stream().map(m -> {
+            final Exchange exchangeOne = (Exchange) m[0];
+            final Exchange exchangeTwo = (Exchange) m[1];
+            return new MatchData(exchangeOne, exchangeTwo);
+        }).collect(Collectors.toList());
+
+        final Set<MatchData> uniqData = new HashSet<>(matches);
+        final List<MatchData> matchDataListSorted = uniqData.stream().sorted((m1, m2) -> -1 * m1.compare(m2))
+                .collect(Collectors.toList());
+
+        return matchDataListSorted;
+    }
+}

buisnesslogic/src/test/java/com/plannaplan/repositories/ExchangeRepositoryTest.java

@@ -0,0 +1,69 @@
+package com.plannaplan.repositories;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.List;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Commision;
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.Groups;
+import com.plannaplan.entities.User;
+import com.plannaplan.services.AssignmentService;
+import com.plannaplan.services.GroupService;
+import com.plannaplan.services.UserService;
+import com.plannaplan.types.UserRoles;
+import com.plannaplan.types.WeekDay;
+
+import org.junit.Test;
+
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.annotation.DirtiesContext.MethodMode;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@ContextConfiguration
+public class ExchangeRepositoryTest{
+    @Autowired
+    private ExchangeRepository exchangeRepository;
+
+    @Autowired
+    private AssignmentService assignmentService;
+
+    @Autowired
+    private GroupService groupService;
+
+    @Autowired
+    private UserService userService;
+
+    @Autowired
+    private CommisionRepository commisionRepository;
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldReturnMatches() {
+	final User user1 = this.userService.save(
+						 new User(null, null, "shouldReturnMatches@ExchangeRepository.test", "123454", UserRoles.STUDENT, 451));
+	final Groups group1 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.MONDAY, null));
+	final Commision commision1 = this.commisionRepository.save(new Commision(user1));
+	final User user2 = this.userService.save(
+						 new User(null, null, "shouldReturnMatches@ExchangeRepository.test", "123454", UserRoles.STUDENT, 451));
+	final Groups group2 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.MONDAY, null));
+	final Commision commision2 = this.commisionRepository.save(new Commision(user2));
+	final Assignment assignmentUser1 = this.assignmentService.save(new Assignment(group1, commision1));
+	final Assignment assignmentUser2 = this.assignmentService.save(new Assignment(group2, commision2));
+
+	this.assignmentService.callAcceptAlgorythm();
+
+	this.exchangeRepository.save(new Exchange(assignmentUser1, group2));
+	this.exchangeRepository.save(new Exchange(assignmentUser2, group1));
+
+	final List<Object[]> exchangeRepoMatches = this.exchangeRepository.getMatches();
+	assertTrue(exchangeRepoMatches.size() == 2);
+    }
+}

buisnesslogic/src/test/java/com/plannaplan/services/ExchangeServiceTest.java

@@ -0,0 +1,208 @@
+package com.plannaplan.services;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Commision;
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.Groups;
+import com.plannaplan.entities.User;
+import com.plannaplan.models.MatchData;
+import com.plannaplan.repositories.CommisionRepository;
+import com.plannaplan.types.UserRoles;
+import com.plannaplan.types.WeekDay;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.annotation.DirtiesContext.MethodMode;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@ContextConfiguration
+public class ExchangeServiceTest {
+
+	@Autowired
+	private AssignmentService assignmentService;
+
+	@Autowired
+	private GroupService groupService;
+
+	@Autowired
+	private UserService userService;
+
+	@Autowired
+	private CommisionRepository commisionRepository;
+
+	@Autowired
+	private ExchangeService exchangeService;
+
+	@Test
+	@DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+	public void shouldReturnUniqMatches() {
+		final User user1 = this.userService.save(
+				new User(null, null, "shouldReturnMatches@ExchangeRepository.test", "123454", UserRoles.STUDENT, 451));
+		final Groups group1 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.MONDAY, null));
+		final Commision commision1 = this.commisionRepository.save(new Commision(user1));
+		final User user2 = this.userService.save(
+				new User(null, null, "shouldReturnMatches@ExchangeRepository.test", "123454", UserRoles.STUDENT, 451));
+		final Groups group2 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.MONDAY, null));
+		final Commision commision2 = this.commisionRepository.save(new Commision(user2));
+		final Assignment assignmentUser1 = this.assignmentService.save(new Assignment(group1, commision1));
+		final Assignment assignmentUser2 = this.assignmentService.save(new Assignment(group2, commision2));
+
+		this.assignmentService.callAcceptAlgorythm();
+
+		this.exchangeService.save(new Exchange(assignmentUser1, group2));
+		this.exchangeService.save(new Exchange(assignmentUser2, group1));
+
+		final List<MatchData> uniqList = this.exchangeService.getMatches();
+		assertTrue(uniqList.size() == 1);
+	}
+
+	@Test
+	@DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+	public void shouldPerformExchange() throws Exception{
+		User user1 = this.userService.save(
+				new User(null, null, "1shouldReturnMatches@ExchangeRepository.test", "123454", UserRoles.STUDENT, 451));
+		final Long user1Id = user1.getId();
+		final Groups group1 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.MONDAY, null));
+		final Commision commision1 = this.commisionRepository.save(new Commision(user1));
+
+		User user2 = this.userService.save(
+				new User(null, null, "2shouldReturnMatches@ExchangeRepository.test", "123455", UserRoles.STUDENT, 452));
+		final Long user2Id = user2.getId();
+		final Groups group2 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.THURSDAY, null));
+		final Commision commision2 = this.commisionRepository.save(new Commision(user2));
+
+		User user3 = this.userService.save(
+				new User(null, null, "3shouldReturnMatches@ExchangeRepository.test", "123456", UserRoles.STUDENT, 453));
+		final Long user3Id = user3.getId();
+		final Groups group3 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.WEDNESDAY, null));
+		final Commision commision3 = this.commisionRepository.save(new Commision(user3));
+
+		User user4 = this.userService.save(
+				new User(null, null, "2shouldReturnMatches@ExchangeRepository.test", "123457", UserRoles.STUDENT, 455));
+		final Long user4Id = user4.getId();
+		final Groups group4 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.FRIDAY, null));
+		final Commision commision4 = this.commisionRepository.save(new Commision(user4));
+
+		final Assignment assignmentUser1 = this.assignmentService.save(new Assignment(group1, commision1));
+		final Assignment assignmentUser2 = this.assignmentService.save(new Assignment(group2, commision2));
+		final Assignment assignmentUser3 = this.assignmentService.save(new Assignment(group2, commision3));
+		final Assignment assignmentUser4 = this.assignmentService.save(new Assignment(group4, commision4));
+
+		this.assignmentService.callAcceptAlgorythm();
+
+		this.exchangeService.save(new Exchange(assignmentUser1, group2));
+		Thread.sleep(1000);
+		this.exchangeService.save(new Exchange(assignmentUser2, group1));
+		Thread.sleep(1000);
+		this.exchangeService.save(new Exchange(assignmentUser3, group1));
+		Thread.sleep(1000);
+		this.exchangeService.save(new Exchange(assignmentUser4, group3));
+
+		this.exchangeService.performExchange();
+
+		user1 = this.userService.getById(user1Id).get();
+		Thread.sleep(1000);
+		user2 = this.userService.getById(user2Id).get();
+		Thread.sleep(1000);
+		user3 = this.userService.getById(user3Id).get();
+		Thread.sleep(1000);
+		user4 = this.userService.getById(user4Id).get();
+		Thread.sleep(1000);
+
+		final List<Long> listGroupsOfUser1 = user1.getStudentRegisteredGrups().stream().map(Groups::getId)
+				.collect(Collectors.toList());
+		final List<Long> listGroupsOfUser2 = user2.getStudentRegisteredGrups().stream().map(Groups::getId)
+				.collect(Collectors.toList());
+		final List<Long> listGroupsOfUser3 = user3.getStudentRegisteredGrups().stream().map(Groups::getId)
+				.collect(Collectors.toList());
+		final List<Long> listGroupsOfUser4 = user4.getStudentRegisteredGrups().stream().map(Groups::getId)
+				.collect(Collectors.toList());
+
+		assertTrue(listGroupsOfUser1.contains(group2.getId()));
+		assertTrue(listGroupsOfUser2.contains(group1.getId()));
+		assertTrue(listGroupsOfUser3.contains(group2.getId()));
+		assertTrue(listGroupsOfUser4.contains(group4.getId()));
+	}
+
+	@Test
+	@DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+	public void shouldRemoveOutDatedExchnages() throws Exception {
+		User user1 = this.userService.save(
+				new User(null, null, "1shouldReturnMatches@ExchangeRepository.test", "123454", UserRoles.STUDENT, 451));
+		final Long user1Id = user1.getId();
+		final Groups group1 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.MONDAY, null));
+		final Commision commision1 = this.commisionRepository.save(new Commision(user1));
+
+		User user2 = this.userService.save(
+				new User(null, null, "2shouldReturnMatches@ExchangeRepository.test", "123455", UserRoles.STUDENT, 452));
+		final Long user2Id = user2.getId();
+		final Groups group2 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.THURSDAY, null));
+		final Commision commision2 = this.commisionRepository.save(new Commision(user2));
+
+		final Groups group3 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.THURSDAY, null));
+		final Groups group4 = this.groupService.save(new Groups(123, "A2-3", null, 430, WeekDay.THURSDAY, null));
+
+		final Assignment assignmentUser1 = this.assignmentService.save(new Assignment(group1, commision1));
+		final Assignment assignmentUser2 = this.assignmentService.save(new Assignment(group2, commision2));
+
+		this.assignmentService.callAcceptAlgorythm();
+
+		this.exchangeService.save(new Exchange(assignmentUser1, group2));
+		Thread.sleep(1000);
+		this.exchangeService.save(new Exchange(assignmentUser2, group1));
+		Thread.sleep(1000);
+		this.exchangeService.save(new Exchange(assignmentUser1, group3));
+		Thread.sleep(1000);
+		this.exchangeService.save(new Exchange(assignmentUser1, group4));
+		Thread.sleep(1000);
+
+		this.exchangeService.performExchange();
+
+		user1 = this.userService.getById(user1Id).get();
+		user2 = this.userService.getById(user2Id).get();
+
+		final List<Long> listGroupsOfUser1 = user1.getStudentRegisteredGrups().stream().map(Groups::getId)
+				.collect(Collectors.toList());
+		final List<Long> listGroupsOfUser2 = user2.getStudentRegisteredGrups().stream().map(Groups::getId)
+				.collect(Collectors.toList());
+
+		assertTrue(listGroupsOfUser1.contains(group2.getId()));
+		assertTrue(listGroupsOfUser2.contains(group1.getId()));
+		assertTrue(this.exchangeService.getAllExchanges().size() == 2);
+	}
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldSortExchanges() throws Exception{
+	final List<MatchData> listMatrix = new ArrayList<>();
+	final Exchange exchange1 = new Exchange(null, null);
+	Thread.sleep(1000);
+	final Exchange exchange2 = new Exchange(null, null);
+	Thread.sleep(1000);
+	final Exchange exchange3 = new Exchange(null, null);
+	Thread.sleep(1000);
+	final Exchange exchange4 = new Exchange(null, null);
+	Thread.sleep(1000);
+
+	listMatrix.add(new MatchData(exchange2, exchange4));
+	listMatrix.add(new MatchData(exchange1, exchange3));
+
+	final List<MatchData> matchDataListSorted = listMatrix.stream().sorted((m1, m2) -> -1 * m1.compare(m2)).collect(Collectors.toList());
+
+	assertTrue(listMatrix.get(0).equals(matchDataListSorted.get(1)));
+	assertTrue(listMatrix.get(1).equals(matchDataListSorted.get(0)));
+	assertTrue(matchDataListSorted.size() == 2);
+    }
+}

gettoken.py

@@ -6,10 +6,14 @@ from urllib.parse import parse_qs
 import sys
 import requests as r
 
+no_browser = False
+API_ADDRESS = "http://localhost:1285"
+
 if len(sys.argv) > 1 :    
+    if (sys.argv[1] == "no-browser" or sys.argv[2] == "no-browser"):
+        no_browser = True
+    else:
         API_ADDRESS = "http://" + sys.argv[1] + ":1285"
-else:
-    API_ADDRESS = "http://localhost:1285"
 
 PORT = 3000
 
@@ -39,5 +43,6 @@ def wait_for_request(server_class=HTTPServer,
 url = 'https://cas.amu.edu.pl/cas/login?service=http://localhost:' + \
     str(PORT) + '&locale=pl'
 
-webbrowser.open_new_tab(url)
+if no_browser == False:
+    webbrowser.open_new_tab(url)
 wait_for_request()

restservice/src/main/java/com/plannaplan/controllers/ExchangeController.java

@@ -0,0 +1,151 @@
+package com.plannaplan.controllers;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import com.plannaplan.App;
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.Groups;
+import com.plannaplan.entities.User;
+import com.plannaplan.exceptions.UserNotFoundException;
+import com.plannaplan.responses.mappers.ExchangeResponseMappers;
+import com.plannaplan.responses.models.ExchangeResponse;
+import com.plannaplan.services.AssignmentService;
+import com.plannaplan.services.ExchangeService;
+import com.plannaplan.services.GroupService;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+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.RestController;
+
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
+import io.swagger.annotations.ApiParam;
+
+@RestController
+@CrossOrigin
+@RequestMapping("/api/" + App.API_VERSION + "/exchanges")
+@Api(tags = { "Exchange" }, value = "Exchange", description = "Endpoint to exchange with accepted assignments.")
+public class ExchangeController extends TokenBasedController{
+
+    @Autowired
+    private GroupService groupService;
+
+    @Autowired
+    private AssignmentService assignmentService;
+
+    @Autowired
+    private ExchangeService exchangeService;
+
+    @PostMapping("/exchange")
+    @ApiOperation(value = "Creates exchange offer.")
+    public ResponseEntity<String> createExchange(
+        @ApiParam( value = "Json object that contains assignment to trade and desired group")
+        @RequestBody
+        Map<String, Long> exchangeRequest)
+            throws UserNotFoundException {
+
+        final User asker = this.getCurrentUser()
+                                        .orElseThrow(() -> new UserNotFoundException("Invalid token"));
+        final Long assignmentId = exchangeRequest.get("assignment");
+        final Long groupId = exchangeRequest.get("group");
+        final List<Long> ownedGroups = asker.getStudentRegisteredGrups().stream().map(Groups::getId).collect(Collectors.toList());
+
+        if(ownedGroups.contains(groupId)){
+            return new ResponseEntity<>("User has already got this group.", HttpStatus.BAD_REQUEST);
+        }
+
+        if(assignmentId == null || groupId == null ){
+            return new ResponseEntity<>("Some of values are missing", HttpStatus.BAD_REQUEST);
+        }
+
+        final Optional<Assignment> assignment = this.assignmentService.getById(assignmentId);
+        final Optional<Groups> group = this.groupService.getGroupById(groupId);
+
+        if(assignment.isEmpty() || group.isEmpty()){
+            return new ResponseEntity<>("Some of provided value does not exist.", HttpStatus.BAD_REQUEST);
+        }
+
+        final Assignment assignmentInstance = assignment.get();
+        final Groups groupInstance = group.get();
+
+        if(!(assignmentInstance.getCommision().getCommisionOwner().getId().equals(asker.getId()) && assignmentInstance.isAccepted())){
+            return new ResponseEntity<>("Some of problems appeared. Check if you have access to given assignment and if it is accepted or the exchange has not been already added.", HttpStatus.BAD_REQUEST);
+        }
+
+        this.exchangeService.save(new Exchange(assignmentInstance, groupInstance));
+
+        return new ResponseEntity<>("Success", HttpStatus.OK);
+    }
+
+    @DeleteMapping("/exchange/{id}")
+    @ApiOperation(value = "Delete exchange offer")
+    public ResponseEntity<String> deleteExchange(@PathVariable(name = "id", required = false) Long offerId)
+            throws UserNotFoundException {
+
+        final User asker = this.getCurrentUser()
+                                        .orElseThrow(() -> new UserNotFoundException("Invalid token"));
+
+        final Optional<Exchange> exchange = this.exchangeService.getById(offerId);
+
+        if(exchange.isEmpty()){
+            return new ResponseEntity<>("Given offer does not exist.",  HttpStatus.BAD_REQUEST);
+        }
+
+        final Exchange exchangeToDelete = exchange.get();
+
+        if(!(exchangeToDelete.getOwnedAssignment().getCommision().getCommisionOwner().getId().equals(asker.getId()))){
+            return new ResponseEntity<>("You have not permission for that action.",  HttpStatus.BAD_REQUEST);
+        }
+
+        this.exchangeService.deleteExchange(exchangeToDelete);
+        return new ResponseEntity<>("Success", HttpStatus.OK);
+    }
+
+    @GetMapping("/exchange/all")
+    @ApiOperation(value = "Get exchange offers")
+    public ResponseEntity<List<ExchangeResponse>> getExchange()
+            throws UserNotFoundException {
+
+        final User asker = this.getCurrentUser()
+                                        .orElseThrow(() -> new UserNotFoundException("Invalid token"));
+
+        final List<Exchange> response = exchangeService.getByUserId(asker.getId());
+        final List<ExchangeResponse> listOfResponses = ExchangeResponseMappers.mapToDefaultResponse(response);
+
+        return new ResponseEntity<>(listOfResponses, HttpStatus.OK);
+    }
+
+    @GetMapping("/exchange/{id}")
+    @ApiOperation(value = "Get exchange offers")
+    public ResponseEntity<ExchangeResponse> getExchangeById(@PathVariable(name = "id", required = false) Long offerId)
+            throws UserNotFoundException {
+
+        final User asker = this.getCurrentUser()
+                                        .orElseThrow(() -> new UserNotFoundException("Invalid token"));
+
+        final Optional<Exchange> exchange = this.exchangeService.getById(offerId);
+
+        if(exchange.isEmpty()){
+            return new ResponseEntity<>(null,  HttpStatus.BAD_REQUEST);
+        }
+
+        final Exchange exchangeInstance = exchange.get();
+        if(!exchangeInstance.getOwnerId().equals(asker.getId())){
+            return new ResponseEntity<>(null,  HttpStatus.BAD_REQUEST);
+        }
+
+        return new ResponseEntity<>(new ExchangeResponse(exchangeInstance), HttpStatus.OK);
+    }
+}

restservice/src/main/java/com/plannaplan/responses/mappers/ExchangeResponseMappers.java

@@ -0,0 +1,14 @@
+package com.plannaplan.responses.mappers;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.responses.models.ExchangeResponse;
+
+public class ExchangeResponseMappers {
+    public static final List<ExchangeResponse> mapToDefaultResponse(List<Exchange> exchanges) {
+        return exchanges.stream().filter(Objects::nonNull).map(ExchangeResponse::new).collect(Collectors.toList());
+    }
+}

restservice/src/main/java/com/plannaplan/responses/models/ExchangeResponse.java

@@ -0,0 +1,36 @@
+package com.plannaplan.responses.models;
+
+import com.plannaplan.entities.Exchange;
+
+public class ExchangeResponse {
+    private Long id;
+    private GroupDefaultResponse ownedAssignment;
+    private GroupDefaultResponse desiredGroup;
+
+    public ExchangeResponse(Exchange exchange){
+        this.id = exchange.getId();
+        this.ownedAssignment = new GroupDefaultResponse(exchange.getOwnedAssignment().getGroup());
+        this.desiredGroup = new GroupDefaultResponse(exchange.getDesiredAssignment());
+    }
+
+	public GroupDefaultResponse getDesiredGroup() {
+		return desiredGroup;
+	}
+	public void setDesiredGroup(GroupDefaultResponse desiredGroup) {
+		this.desiredGroup = desiredGroup;
+	}
+	public GroupDefaultResponse getOwnedAssignment() {
+		return ownedAssignment;
+	}
+	public void setOwnedAssignment(GroupDefaultResponse ownedAssignment) {
+		this.ownedAssignment = ownedAssignment;
+	}
+	public Long getId() {
+		return id;
+	}
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+    
+}

restservice/src/test/java/com/plannaplan/controllers/ExchangeControllerTest.java

@@ -0,0 +1,294 @@
+package com.plannaplan.controllers;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.annotation.DirtiesContext.MethodMode;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import static org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers.*;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import java.nio.charset.Charset;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Commision;
+import com.plannaplan.entities.Exchange;
+import com.plannaplan.entities.Groups;
+import com.plannaplan.entities.User;
+import com.plannaplan.services.AssignmentService;
+import com.plannaplan.services.CommisionService;
+import com.plannaplan.services.ExchangeService;
+import com.plannaplan.services.GroupService;
+import com.plannaplan.services.UserService;
+import com.plannaplan.types.UserRoles;
+import com.plannaplan.types.WeekDay;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@ContextConfiguration
+public class ExchangeControllerTest extends AbstractControllerTest {
+
+    private final static String EXCHANGE_ENDPOINT = "/api/v1/exchanges/exchange";
+    private static final MediaType APPLICATION_JSON_UTF8 = new MediaType(MediaType.APPLICATION_JSON.getType(),
+            MediaType.APPLICATION_JSON.getSubtype(), Charset.forName("utf8"));
+
+    @Autowired
+    private UserService userService;
+
+    @Autowired
+    private GroupService groupService;
+
+    @Autowired
+    private AssignmentService assignmentService;
+
+    @Autowired
+    private CommisionService commisionService;
+
+    @Autowired
+    private ExchangeService exchangeService;
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldGetAllUsersExchanges() throws Exception {
+        final User user = this.userService.save(new User(null, null,
+        "shouldGetAllUsersExchanges@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups groupDesired = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        this.exchangeService.save(new Exchange(assignment, groupDesired));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(get(EXCHANGE_ENDPOINT + "/all").header("Authorization", "Bearer " +
+        token)).andExpect(status().isOk());
+    }
+
+    @Test
+    public void shouldFailGettingNotExistingExchange() throws Exception {
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailGettingNotExistingExchange@ExchangeController.test", UserRoles.STUDENT));
+
+        final String token = this.userService.login(user).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(get(EXCHANGE_ENDPOINT + "/" + user.getId()).header("Authorization", "Bearer " + token)).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldGetSingleExchange() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldGetSingleExchange@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups groupDesired = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        final Exchange exchange = this.exchangeService.save(new Exchange(assignment, groupDesired));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(get(EXCHANGE_ENDPOINT + "/" + exchange.getId()).header("Authorization", "Bearer " +
+        token)).andExpect(status().isOk());
+    }
+
+    @Test
+    public void shouldFailGettingExchangeDueToPermission() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailGettingExchangeDueToPermission@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups groupDesired = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        final Exchange exchange = this.exchangeService.save(new Exchange(assignment, groupDesired));
+
+        final User user2 = this.userService.save(new User(null, null,
+                                "shouldFailGettingExchangeDueToPermission2@ExchangeController.test", "11112", UserRoles.STUDENT, 321));
+        final String token2 = this.userService.login(user2).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT + "/" + exchange.getId()).header("Authorization", "Bearer " +
+        token2)).andExpect(status().is4xxClientError());
+    }
+
+    @Test
+    public void shouldFailPostDueToAssignmentNotFound() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailPostDueToAssignmentNotFound@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(212, "A2-1", null, 420, WeekDay.WEDNESDAY, null));
+
+        MockMvc mockMvc =
+        MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"assignment\": "+ user.getId() +", \"group\": "+ group.getId() +" }")).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldInsertExchange() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldInsertExchange@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups groupDesired = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+
+        this.assignmentService.callAcceptAlgorythm();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"assignment\": "+ assignment.getId() +", \"group\": "+ groupDesired.getId() +" }")).andExpect(status().isOk());
+    }
+
+    @Test
+    public void shouldFailInsertExchangeDueToMissingGroup() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailInsertExchangeDueToMissingGroup@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"assignment\": "+ user.getId() +" }")).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    public void shouldFailInsertExchangeDueToMissingAssignment() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailInsertExchangeDueToMissingAssignment@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(212, "A2-1", null, 420, WeekDay.WEDNESDAY, null));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"group\": "+ group.getId() +" }")).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    public void shouldFailInsertExchangeDueToMissingParam() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailInsertExchangeDueToMissingParam@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8)).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldDenyExchangeDueToAssigmentOverlapping() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+        "shouldDenyExchangeDueToAssigmentOverlapping@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        this.exchangeService.save(new Exchange(assignment, group));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"assignment\": "+ user.getId() +", \"group\": "+ group.getId() +" }")).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    public void shouldDenyPostDueToAssignmentNotAccepted() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldDenyPostDueToAssignmentNotAccepted@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(212, "A2-1", null, 420, WeekDay.WEDNESDAY, null));
+        final Groups group2 = this.groupService.save(new Groups(213, "A2-2", null, 420, WeekDay.MONDAY, null));
+        final Commision commision =  this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group,commision));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"assignment\": "+ assignment.getId() +", \"group\": "+ group2.getId() +" }")).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldDeleteExchange() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldDeleteExchange@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups groupDesired = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        final Exchange exchange = this.exchangeService.save(new Exchange(assignment, groupDesired));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(delete(EXCHANGE_ENDPOINT + "/" + exchange.getId()).header("Authorization", "Bearer " +
+        token)).andExpect(status().isOk());
+    }
+
+    @Test
+    public void shouldFailDeleteDueToWrongPermissions() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailDeleteDueToWrongPermissions@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups groupDesired = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        final Exchange exchange = this.exchangeService.save(new Exchange(assignment, groupDesired));
+
+        final User user2 = this.userService.save(new User(null, null,
+        "shouldFailDeleteDueToWrongPermissions@ExchangeController2.test", "11112", UserRoles.STUDENT, 322));
+        final String token2 = this.userService.login(user2).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(get(EXCHANGE_ENDPOINT + "/" + exchange.getId()).header("Authorization", "Bearer " +
+        token2)).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    public void shouldFailDeleteDueToMissingParam() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+        "shouldFailDeleteDueToMissingParam@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(delete(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " + token)).andExpect(status().is4xxClientError());
+    }
+
+    @Test
+    public void shouldFailDeleteDueToExchangeNotFound() throws Exception{
+        final User user = this.userService.save(new User(null, null,
+                                "shouldFailDeleteDueToExchangeNotFound@ExchangeController.test", UserRoles.STUDENT));
+        final String token = this.userService.login(user).getToken();
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(delete(EXCHANGE_ENDPOINT + "/" + user.getId()).header("Authorization", "Bearer " +
+        token)).andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldFailPostDueToGroupAlreadyAccepted() throws Exception{
+        final User user = this.userService.save(new User(null, null, "shouldFailPostDueToGroupAlreadyAccepted@ExchangeController.test", "11111", UserRoles.STUDENT, 320));
+        final String token = this.userService.login(user).getToken();
+        final Groups group = this.groupService.save(new Groups(215, "A2-2", null, 520, WeekDay.TUESDAY, null));
+        final Groups group2 = this.groupService.save(new Groups(216, "A2-3", null, 530, WeekDay.MONDAY, null));
+        final Commision commision = this.commisionService.save(new Commision(user));
+        final Assignment assignment = this.assignmentService.save(new Assignment(group, commision));
+        this.assignmentService.save(new Assignment(group2, commision));
+        this.assignmentService.callAcceptAlgorythm();
+        this.exchangeService.save(new Exchange(assignment, group2));
+
+        MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).apply(springSecurity()).build();
+        mockMvc.perform(post(EXCHANGE_ENDPOINT).header("Authorization", "Bearer " +
+        token).contentType(APPLICATION_JSON_UTF8).content("{\"assignment\": "+ assignment.getId() +", \"group\": "+ group2.getId() +" }")).andExpect(status().isBadRequest());
+    }
+}