Add current user endpoint (#71)

- Add endpoint to obtain the info for the current user
- Get information about the logged in user via the authentication token given in the **X-Auth-Header** HTTTP Header. The API endpoint is accessed with a **GET** method through the following resource:

**/api/v1/user**

- The information includes:
  - role (e.g. STUDENT | ADMIN)
  - docket (only in case that Role is STUDENT)
  - firstName
  - lastName
  - genre
  - birthday
  - email
  - dni
  - address (includes city, country, door, neighborhood, number, street)

- Examples
  - Answer when accessing with a STUDENT:

> {
"address": {
"city": "Caba",
"country": "Argentina",
"door": "",
"neighborhood": "Puerto Madero",
"number": 39222222,
"street": "E. Madero"
},
"birthday": "1994-01-24",
"dni": 12345687,
"docket": 1,
"email": "",
"firstName": "Hola1111",
"genre": "M",
"lastName": "Como Estas123123",
"role": "STUDENT"
}

  - Answer when accesing with an ADMIN:

> {
"address": {
"city": "CABA",
"country": "Argentina",
"neighborhood": "Puerto Madero",
"number": 399,
"street": "E. Madero"
},
"birthday": "1994-08-17",
"dni": 38457012,
"email": "mcomercio@bait.edu.ar",
"firstName": "Matias Nicolas",
"genre": "M",
"lastName": "Comercio Vazquez",
"role": "ADMIN"
}

webapp/src/main/java/ar/edu/itba/paw/webapp/controllers/DTOEntityMapper.java

@@ -3,15 +3,13 @@
 import ar.edu.itba.paw.models.*;
 import ar.edu.itba.paw.models.users.Admin;
 import ar.edu.itba.paw.models.users.Student;
+import ar.edu.itba.paw.models.users.User;
 import ar.edu.itba.paw.webapp.models.*;
 import org.modelmapper.ModelMapper;
 import org.modelmapper.convention.MatchingStrategies;
 import org.modelmapper.spi.MatchingStrategy;
 
-import java.time.LocalDateTime;
-import java.util.Date;
 import java.util.Set;
-import java.util.stream.Collectors;
 
 public class DTOEntityMapper {
 
@@ -77,11 +75,11 @@ FinalInscriptionDTO convertToFinalInscriptionDTO(FinalInscription finalInscripti
     return finalInscriptionDTO;
   }
 
-  public FinalInscriptionIndexDTO convertToFinalInscriptionIndexDTO(FinalInscription finalInscription) {
+  FinalInscriptionIndexDTO convertToFinalInscriptionIndexDTO(FinalInscription finalInscription) {
     return modelMapper.map(finalInscription, FinalInscriptionIndexDTO.class);
   }
 
-  public FinalInscription convertToFinalInscription(FinalInscriptionDTO finalinscriptionDTO, Course course) {
+  FinalInscription convertToFinalInscription(FinalInscriptionDTO finalinscriptionDTO, Course course) {
     FinalInscription finalinscription = modelMapper.map(finalinscriptionDTO, FinalInscription.class);
     finalinscription.setState(FinalInscription.FinalInscriptionState.OPEN);
     finalinscription.setId(null);
@@ -105,4 +103,23 @@ Admin convertToAdmin(final AdminsUpdateDTO adminsUpdateDTO) {
     return modelMapper.map(adminsUpdateDTO, Admin.class);
   }
 
+  UserSessionDTO convertToAdminSessionDTO(final User user) {
+    final UserSessionDTO userSessionDTO = modelMapper.map(user, UserSessionDTO.class);
+    final AddressDTO addressDTO = convertToAddressDTO(user.getAddress());
+
+    userSessionDTO.setAddress(addressDTO);
+    userSessionDTO.setRole(Role.ADMIN);
+
+    return userSessionDTO;
+  }
+
+  StudentSessionDTO convertToStudentSessionDTO(final User user) {
+    final StudentSessionDTO userSessionDTO = modelMapper.map(user, StudentSessionDTO.class);
+    final AddressDTO addressDTO = convertToAddressDTO(user.getAddress());
+
+    userSessionDTO.setAddress(addressDTO);
+    userSessionDTO.setRole(Role.STUDENT);
+
+    return userSessionDTO;
+  }
 }

webapp/src/main/java/ar/edu/itba/paw/webapp/controllers/SessionController.java

@@ -0,0 +1,63 @@
+package ar.edu.itba.paw.webapp.controllers;
+
+import ar.edu.itba.paw.interfaces.AdminService;
+import ar.edu.itba.paw.interfaces.StudentService;
+import ar.edu.itba.paw.interfaces.UserService;
+import ar.edu.itba.paw.models.Role;
+import ar.edu.itba.paw.models.users.Admin;
+import ar.edu.itba.paw.models.users.Student;
+import ar.edu.itba.paw.webapp.models.StudentSessionDTO;
+import ar.edu.itba.paw.webapp.models.UserSessionDTO;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.util.List;
+
+@Component
+@Path("/user")
+public class SessionController {
+	private final static Logger LOGGER = LoggerFactory.getLogger(SessionController.class);
+
+	@Autowired
+	private DTOEntityMapper mapper;
+
+	@Autowired
+	private AdminService as;
+
+	@Autowired
+	private StudentService ss;
+
+	@Autowired
+	private UserService us;
+
+	@GET
+	@Produces(MediaType.APPLICATION_JSON)
+	public Response sessionShow() {
+		final int dni = Integer.valueOf(SecurityContextHolder.getContext().getAuthentication().getPrincipal().toString());
+		final List<Role> roles = us.getRole(dni);
+
+		if(roles.contains(Role.ADMIN)) {
+			final Admin admin = as.getByDni(dni);
+			final UserSessionDTO adminSessionDTO = mapper.convertToAdminSessionDTO(admin);
+
+			return Response.ok(adminSessionDTO).build();
+		} else if(roles.contains(Role.STUDENT)) {
+			final Student student = ss.getByDni(dni);
+			final StudentSessionDTO studentSessionDTO = mapper.convertToStudentSessionDTO(student);
+
+			return Response.ok(studentSessionDTO).build();
+		} else {
+			LOGGER.warn("User {} does not have Role ADMIN or STUDENT", dni);
+
+			return Response.serverError().build();
+		}
+	}
+}

webapp/src/main/java/ar/edu/itba/paw/webapp/models/StudentSessionDTO.java

@@ -0,0 +1,102 @@
+package ar.edu.itba.paw.webapp.models;
+
+import ar.edu.itba.paw.models.Role;
+import ar.edu.itba.paw.models.users.User;
+
+import java.time.LocalDate;
+
+/**
+ * Used for returning info about the logged in user with role STUDENT
+ *
+ * Inheritance from UserSessionDTO was not used
+ * due to JAXB returning 'type' field with 'studentSessionDTO' value in the JSON response.
+ * XmlTransient annotation served useful to remove that field but it also ignored the docket field.
+ *
+ * Composition failed to work with modelMapper
+ */
+public class StudentSessionDTO {
+	private Integer dni;
+	private String firstName;
+	private String lastName;
+	private User.Genre genre;
+	private LocalDate birthday;
+	private String email;
+	private Role role;
+	private AddressDTO address;
+	private int docket;
+
+	public StudentSessionDTO() {
+	}
+
+	public Integer getDni() {
+		return dni;
+	}
+
+	public void setDni(Integer dni) {
+		this.dni = dni;
+	}
+
+	public String getFirstName() {
+		return firstName;
+	}
+
+	public void setFirstName(String firstName) {
+		this.firstName = firstName;
+	}
+
+	public String getLastName() {
+		return lastName;
+	}
+
+	public void setLastName(String lastName) {
+		this.lastName = lastName;
+	}
+
+	public User.Genre getGenre() {
+		return genre;
+	}
+
+	public void setGenre(User.Genre genre) {
+		this.genre = genre;
+	}
+
+	public LocalDate getBirthday() {
+		return birthday;
+	}
+
+	public void setBirthday(LocalDate birthday) {
+		this.birthday = birthday;
+	}
+
+	public String getEmail() {
+		return email;
+	}
+
+	public void setEmail(String email) {
+		this.email = email;
+	}
+
+	public Role getRole() {
+		return role;
+	}
+
+	public void setRole(Role role) {
+		this.role = role;
+	}
+
+	public AddressDTO getAddress() {
+		return address;
+	}
+
+	public void setAddress(AddressDTO address) {
+		this.address = address;
+	}
+
+	public int getDocket() {
+		return docket;
+	}
+
+	public void setDocket(int docket) {
+		this.docket = docket;
+	}
+}

webapp/src/main/java/ar/edu/itba/paw/webapp/models/UserSessionDTO.java

@@ -0,0 +1,88 @@
+package ar.edu.itba.paw.webapp.models;
+
+import ar.edu.itba.paw.models.Role;
+import ar.edu.itba.paw.models.users.User;
+
+import java.time.LocalDate;
+
+/**
+ * Used for returning info about the logged in user with role ADMIN
+ */
+public class UserSessionDTO {
+
+	private Integer dni;
+	private String firstName;
+	private String lastName;
+	private User.Genre genre;
+	private LocalDate birthday;
+	private String email;
+	private Role role;
+	private AddressDTO address;
+
+	public UserSessionDTO() {
+	}
+
+	public Integer getDni() {
+		return dni;
+	}
+
+	public void setDni(final Integer dni) {
+		this.dni = dni;
+	}
+
+	public String getFirstName() {
+		return firstName;
+	}
+
+	public void setFirstName(final String firstName) {
+		this.firstName = firstName;
+	}
+
+	public String getLastName() {
+		return lastName;
+	}
+
+	public void setLastName(final String lastName) {
+		this.lastName = lastName;
+	}
+
+	public User.Genre getGenre() {
+		return genre;
+	}
+
+	public void setGenre(final User.Genre genre) {
+		this.genre = genre;
+	}
+
+	public LocalDate getBirthday() {
+		return birthday;
+	}
+
+	public void setBirthday(final LocalDate birthday) {
+		this.birthday = birthday;
+	}
+
+	public String getEmail() {
+		return email;
+	}
+
+	public void setEmail(final String email) {
+		this.email = email;
+	}
+
+	public Role getRole() {
+		return role;
+	}
+
+	public void setRole(final Role role) {
+		this.role = role;
+	}
+
+	public AddressDTO getAddress() {
+		return address;
+	}
+
+	public void setAddress(final AddressDTO address) {
+		this.address = address;
+	}
+}