register api

.gitignore

@@ -0,0 +1,25 @@
+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/

build.gradle

@@ -0,0 +1,38 @@
+buildscript {
+	ext {
+		springBootVersion = '1.5.6.RELEASE'
+	}
+	repositories {
+		mavenCentral()
+	}
+	dependencies {
+		classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
+	}
+}
+
+apply plugin: 'java'
+apply plugin: 'eclipse'
+apply plugin: 'idea'
+apply plugin: 'org.springframework.boot'
+
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = 1.8
+
+repositories {
+	mavenCentral()
+}
+
+
+dependencies {
+	compile('org.springframework.boot:spring-boot-starter-data-jpa')
+	compile('org.flywaydb:flyway-core')
+	compile('org.springframework.boot:spring-boot-starter-hateoas')
+	compile('org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0')
+	compile('org.springframework.boot:spring-boot-starter-web')
+	compileOnly('org.projectlombok:lombok')
+	runtime('com.h2database:h2')
+    testCompile 'io.rest-assured:rest-assured:3.0.2'
+	testCompile('org.springframework.boot:spring-boot-starter-test')
+	testCompile('org.springframework.restdocs:spring-restdocs-mockmvc')
+    testCompile('org.mybatis.spring.boot:mybatis-spring-boot-starter-test:1.3.0')
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Mon Aug 07 11:04:20 CST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.5.1-all.zip

gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a userData-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save ( ) {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

src/main/java/io/spring/RealworldApplication.java

@@ -0,0 +1,12 @@
+package io.spring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class RealworldApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(RealworldApplication.class, args);
+	}
+}

src/main/java/io/spring/api/UsersApi.java

@@ -0,0 +1,73 @@
+package io.spring.api;
+
+import com.fasterxml.jackson.annotation.JsonRootName;
+import io.spring.api.exception.InvalidRequestException;
+import io.spring.application.user.UserQueryService;
+import io.spring.core.user.User;
+import io.spring.core.user.UserRepository;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.hibernate.validator.constraints.Email;
+import org.hibernate.validator.constraints.NotBlank;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.BindingResult;
+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 javax.validation.Valid;
+
+@RestController
+@RequestMapping("/users")
+public class UsersApi {
+    private UserRepository userRepository;
+    private UserQueryService userQueryService;
+    private String defaultImage;
+
+    @Autowired
+    public UsersApi(UserRepository userRepository, UserQueryService userQueryService, @Value("${image.default}") String defaultImage) {
+        this.userRepository = userRepository;
+        this.userQueryService = userQueryService;
+        this.defaultImage = defaultImage;
+    }
+
+    @RequestMapping(method = RequestMethod.POST)
+    public ResponseEntity creeteUser(@Valid @RequestBody RegisterParam registerParam, BindingResult bindingResult) {
+        if (bindingResult.hasErrors()) {
+            throw new InvalidRequestException(bindingResult);
+        }
+        if (userRepository.findByUsername(registerParam.getUsername()).isPresent()) {
+            bindingResult.rejectValue("username", "DUPLICATED", "duplicated username");
+            throw new InvalidRequestException(bindingResult);
+        }
+
+        if (userRepository.findByEmail(registerParam.getEmail()).isPresent()) {
+            bindingResult.rejectValue("email", "DUPLICATED", "duplicated email");
+            throw new InvalidRequestException(bindingResult);
+        }
+        User user = new User(
+            registerParam.getEmail(),
+            registerParam.getUsername(),
+            registerParam.getPassword(),
+            "",
+            defaultImage);
+        userRepository.save(user);
+        return ResponseEntity.status(201).body(userQueryService.fetchCreatedUser(user.getUsername()));
+    }
+}
+
+@Getter
+@JsonRootName("user")
+@NoArgsConstructor
+class RegisterParam {
+    @NotBlank(message = "can't be empty")
+    @Email(message = "should be an email")
+    private String email;
+    @NotBlank(message = "can't be empty")
+    private String username;
+    @NotBlank(message = "can't be empty")
+    private String password;
+}

src/main/java/io/spring/api/exception/CustomizeExceptionHandler.java

@@ -0,0 +1,37 @@
+package io.spring.api.exception;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.springframework.http.HttpStatus.UNPROCESSABLE_ENTITY;
+
+@RestControllerAdvice
+public class CustomizeExceptionHandler extends ResponseEntityExceptionHandler {
+
+    @ExceptionHandler({InvalidRequestException.class})
+    public ResponseEntity<Object> handleInvalidRequest(RuntimeException e, WebRequest request) {
+        InvalidRequestException ire = (InvalidRequestException) e;
+
+        List<FieldErrorResource> errorResources = ire.getErrors().getFieldErrors().stream().map(fieldError ->
+            new FieldErrorResource(
+                fieldError.getObjectName(),
+                fieldError.getField(),
+                fieldError.getCode(),
+                fieldError.getDefaultMessage())).collect(Collectors.toList());
+
+        ErrorResource error = new ErrorResource(errorResources);
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+
+        return handleExceptionInternal(e, error, headers, UNPROCESSABLE_ENTITY, request);
+    }
+}

src/main/java/io/spring/api/exception/ErrorResource.java

@@ -0,0 +1,22 @@
+package io.spring.api.exception;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonRootName;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@JsonSerialize(using = ErrorResourceSerializer.class)
+@JsonIgnoreProperties(ignoreUnknown = true)
+@lombok.Getter
+@JsonRootName("errors")
+public class ErrorResource {
+    private List<FieldErrorResource> fieldErrors;
+
+    public ErrorResource(List<FieldErrorResource> fieldErrorResources) {
+        this.fieldErrors = fieldErrorResources;
+    }
+}

src/main/java/io/spring/api/exception/ErrorResourceSerializer.java

@@ -0,0 +1,38 @@
+package io.spring.api.exception;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class ErrorResourceSerializer extends JsonSerializer<ErrorResource> {
+    @Override
+    public void serialize(ErrorResource value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
+        Map<String, List<String>> json = new HashMap<>();
+        for (FieldErrorResource fieldErrorResource : value.getFieldErrors()) {
+            if (!json.containsKey(fieldErrorResource.getField())) {
+                json.put(fieldErrorResource.getField(), new ArrayList<String>());
+            }
+            json.get(fieldErrorResource.getField()).add(fieldErrorResource.getMessage());
+        }
+        gen.writeStartObject();
+        for (Map.Entry<String, List<String>> pair : json.entrySet()) {
+            gen.writeArrayFieldStart(pair.getKey());
+            pair.getValue().forEach(content -> {
+                try {
+                    gen.writeString(content);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            });
+            gen.writeEndArray();
+        }
+        gen.writeEndObject();
+    }
+}

src/main/java/io/spring/api/exception/FieldErrorResource.java

@@ -0,0 +1,21 @@
+package io.spring.api.exception;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import lombok.Getter;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+@Getter
+public class FieldErrorResource {
+    private String resource;
+    private String field;
+    private String code;
+    private String message;
+
+    public FieldErrorResource(String resource, String field, String code, String message) {
+
+        this.resource = resource;
+        this.field = field;
+        this.code = code;
+        this.message = message;
+    }
+}

src/main/java/io/spring/api/exception/InvalidRequestException.java

@@ -0,0 +1,20 @@
+package io.spring.api.exception;
+
+import com.fasterxml.jackson.annotation.JsonRootName;
+import org.springframework.validation.BindingResult;
+import org.springframework.validation.Errors;
+
+@SuppressWarnings("serial")
+@JsonRootName("errors")
+public class InvalidRequestException extends RuntimeException {
+    private final Errors errors;
+
+    public InvalidRequestException(Errors errors) {
+        super("");
+        this.errors = errors;
+    }
+
+    public Errors getErrors() {
+        return errors;
+    }
+}

src/main/java/io/spring/application/JwtService.java

@@ -0,0 +1,7 @@
+package io.spring.application;
+
+import io.spring.application.user.UserData;
+
+public interface JwtService {
+    String toToken(UserData userData);
+}

src/main/java/io/spring/application/user/UserData.java

@@ -0,0 +1,22 @@
+package io.spring.application.user;
+
+import com.fasterxml.jackson.annotation.JsonRootName;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@JsonRootName("user")
+public class UserData {
+    private String email;
+    @Id
+    private String username;
+    private String bio;
+    private String image;
+}

src/main/java/io/spring/application/user/UserQueryService.java

@@ -0,0 +1,42 @@
+package io.spring.application.user;
+
+import com.fasterxml.jackson.annotation.JsonRootName;
+import io.spring.application.JwtService;
+import lombok.Getter;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserQueryService  {
+    private UserReadService userReadService;
+    private JwtService jwtService;
+
+    public UserQueryService(UserReadService userReadService, JwtService jwtService) {
+        this.userReadService = userReadService;
+        this.jwtService = jwtService;
+    }
+
+    public UserWithToken fetchCreatedUser(String username) {
+        UserData userData = userReadService.findOne(username);
+        return new UserWithToken(userData, jwtService.toToken(userData));
+    }
+
+}
+
+@JsonRootName("user")
+@Getter
+class UserWithToken {
+    private String email;
+    private String username;
+    private String bio;
+    private String image;
+    private String token;
+
+    public UserWithToken(UserData userData, String token) {
+        this.email = userData.getEmail();
+        this.username = userData.getUsername();
+        this.bio = userData.getBio();
+        this.image = userData.getImage();
+        this.token = token;
+    }
+
+}

src/main/java/io/spring/application/user/UserReadService.java

@@ -0,0 +1,8 @@
+package io.spring.application.user;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface UserReadService extends CrudRepository<UserData, String> {
+
+}
+

src/main/java/io/spring/core/user/User.java

@@ -0,0 +1,25 @@
+package io.spring.core.user;
+
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@EqualsAndHashCode(of = {"username"})
+public class User {
+    private String email;
+    private String username;
+    private String password;
+    private String bio;
+    private String image;
+
+    public User(String email, String username, String password, String bio, String image) {
+        this.email = email;
+        this.username = username;
+        this.password = password;
+        this.bio = bio;
+        this.image = image;
+    }
+}

src/main/java/io/spring/core/user/UserRepository.java

@@ -0,0 +1,14 @@
+package io.spring.core.user;
+
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public interface UserRepository {
+    void save(User user);
+
+    Optional<User> findByUsername(String username);
+
+    Optional<User> findByEmail(String email);
+}

src/main/java/io/spring/infrastructure/user/MyBatisUserRepository.java

@@ -0,0 +1,33 @@
+package io.spring.infrastructure.user;
+
+import io.spring.core.user.User;
+import io.spring.core.user.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public class MyBatisUserRepository implements UserRepository {
+    private final UserMapper userMapper;
+
+    @Autowired
+    public MyBatisUserRepository(UserMapper userMapper) {
+        this.userMapper = userMapper;
+    }
+
+    @Override
+    public void save(User user) {
+        userMapper.save(user);
+    }
+
+    @Override
+    public Optional<User> findByUsername(String username) {
+        return Optional.ofNullable(userMapper.findByUsername(username));
+    }
+
+    @Override
+    public Optional<User> findByEmail(String email) {
+        return Optional.ofNullable(userMapper.findByEmail(email));
+    }
+}

src/main/java/io/spring/infrastructure/user/UserMapper.java

@@ -0,0 +1,15 @@
+package io.spring.infrastructure.user;
+
+import io.spring.core.user.User;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.springframework.stereotype.Component;
+
+@Component
+@Mapper
+public interface UserMapper {
+    void save(@Param("user") User user);
+
+    User findByUsername(@Param("username") String username);
+    User findByEmail(@Param("email") String email);
+}

src/main/resources/application.properties

@@ -0,0 +1,6 @@
+spring.jackson.deserialization.UNWRAP_ROOT_VALUE=true
+spring.jackson.serialization.WRAP_ROOT_VALUE=true
+image.default=https://static.productionready.io/images/smiley-cyrus.jpg
+
+mybatis.config-location=mybatis-config.xml
+mybatis.mapper-locations=mapper/*Mapper.xml

src/main/resources/db/migration/V1__create_tables.sql

@@ -0,0 +1,7 @@
+create table users (
+  username varchar(255) primary key,
+  password varchar(255),
+  email varchar(255) UNIQUE,
+  bio text,
+  image varchar(511)
+);

src/main/resources/mapper/UserMapper.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
+<mapper namespace="io.spring.infrastructure.user.UserMapper">
+    <insert id="save">
+        insert into users (username, email, password, bio, image) values(
+          #{user.username},
+          #{user.email},
+          #{user.password},
+          #{user.bio},
+          #{user.image}
+        )
+    </insert>
+    <select id="findByUsername" resultMap="user">
+        select * from users where username = #{username}
+    </select>
+    <select id="findByEmail" resultMap="user">
+        select username, email, password, bio, image from users where email = #{email}
+    </select>
+
+    <resultMap id="user" type="io.spring.core.user.User" >
+        <id column="username" property="username"/>
+        <result column="email" property="email"/>
+        <result column="password" property="password"/>
+        <result column="bio" property="bio"/>
+        <result column="image" property="image"/>
+    </resultMap>
+</mapper>

src/main/resources/mybatis-config.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE configuration
+        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-config.dtd">
+<configuration>
+
+    <settings>
+        <!-- Globally enables or disables any caches configured in any mapper under this configuration -->
+        <setting name="cacheEnabled" value="true"/>
+        <!-- Sets the number of seconds the driver will wait for a response from the database -->
+        <setting name="defaultStatementTimeout" value="3000"/>
+        <!-- Enables automatic mapping from classic database column names A_COLUMN to camel case classic Java property names aColumn -->
+        <setting name="mapUnderscoreToCamelCase" value="true"/>
+        <!-- Allows JDBC support for generated keys. A compatible driver is required.
+        This setting forces generated keys to be used if set to true,
+         as some drivers deny compatibility but still work -->
+        <setting name="useGeneratedKeys" value="true"/>
+    </settings>
+
+    <!-- Continue going here -->
+
+</configuration>

src/test/java/io/spring/RealworldApplicationTests.java

@@ -0,0 +1,16 @@
+package io.spring;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class RealworldApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}

src/test/java/io/spring/api/UsersApiTest.java

@@ -0,0 +1,186 @@
+package io.spring.api;
+
+import io.restassured.RestAssured;
+import io.spring.application.JwtService;
+import io.spring.application.user.UserData;
+import io.spring.application.user.UserReadService;
+import io.spring.core.user.User;
+import io.spring.core.user.UserRepository;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.context.embedded.LocalServerPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.junit.Assert.*;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@RunWith(SpringRunner.class)
+public class UsersApiTest {
+    @LocalServerPort
+    private int port;
+
+    @MockBean
+    private UserRepository userRepository;
+
+    @MockBean
+    private JwtService jwtService;
+
+    @MockBean
+    private UserReadService userReadService;
+
+
+    @Before
+    public void setUp() throws Exception {
+        RestAssured.port = port;
+    }
+
+    @Test
+    public void should_create_user_success() throws Exception {
+        String email = "john@jacob.com";
+        String username = "johnjacob";
+
+        when(jwtService.toToken(any())).thenReturn("123");
+        UserData userData = new UserData(email, username, "", "https://static.productionready.io/images/smiley-cyrus.jpg");
+        when(userReadService.findOne(eq(username))).thenReturn(userData);
+
+        Map<String, Object> param = new HashMap<String, Object>() {{
+            put("user", new HashMap<String, Object>() {{
+                put("email", email);
+                put("password", "johnnyjacob");
+                put("username", username);
+            }});
+        }};
+
+        given()
+            .contentType("application/json")
+            .body(param)
+            .when()
+            .post("/users")
+            .then()
+            .statusCode(201)
+            .body("user.email", equalTo(email))
+            .body("user.username", equalTo(username))
+            .body("user.bio", equalTo(""))
+            .body("user.image", equalTo("https://static.productionready.io/images/smiley-cyrus.jpg"))
+            .body("user.token", equalTo("123"));
+
+        verify(userRepository).save(any());
+    }
+
+    @Test
+    public void should_show_error_message_for_blank_username() throws Exception {
+
+        String email = "john@jacob.com";
+        String username = "";
+
+        Map<String, Object> param = new HashMap<String, Object>() {{
+            put("user", new HashMap<String, Object>() {{
+                put("email", email);
+                put("password", "johnnyjacob");
+                put("username", username);
+            }});
+        }};
+
+        given()
+            .contentType("application/json")
+            .body(param)
+            .when()
+            .post("/users")
+            .then()
+            .statusCode(422)
+            .body("errors.username[0]", equalTo("can't be empty"));
+    }
+
+    @Test
+    public void should_show_error_message_for_invalid_email() throws Exception {
+        String email = "johnxjacob.com";
+        String username = "johnjacob";
+
+        Map<String, Object> param = new HashMap<String, Object>() {{
+            put("user", new HashMap<String, Object>() {{
+                put("email", email);
+                put("password", "johnnyjacob");
+                put("username", username);
+            }});
+        }};
+
+        given()
+            .contentType("application/json")
+            .body(param)
+            .when()
+            .post("/users")
+            .then()
+            .statusCode(422)
+            .body("errors.email[0]", equalTo("should be an email"));
+
+    }
+
+    @Test
+    public void should_show_error_for_duplicated_username() throws Exception {
+        String email = "john@jacob.com";
+        String username = "johnjacob";
+
+        when(userRepository.findByUsername(eq(username))).thenReturn(Optional.of(new User(
+            email, username, "123", "bio", ""
+        )));
+
+        Map<String, Object> param = new HashMap<String, Object>() {{
+            put("user", new HashMap<String, Object>() {{
+                put("email", email);
+                put("password", "johnnyjacob");
+                put("username", username);
+            }});
+        }};
+
+        given()
+            .contentType("application/json")
+            .body(param)
+            .when()
+            .post("/users")
+            .then()
+            .statusCode(422)
+            .body("errors.username[0]", equalTo("duplicated username"));
+    }
+
+    @Test
+    public void should_show_error_for_duplicated_email() throws Exception {
+        String email = "john@jacob.com";
+        String username = "johnjacob2";
+
+        when(userRepository.findByEmail(eq(email))).thenReturn(Optional.of(new User(
+            email, username, "123", "bio", ""
+        )));
+
+        when(userRepository.findByUsername(eq(username))).thenReturn(Optional.empty());
+
+        Map<String, Object> param = new HashMap<String, Object>() {{
+            put("user", new HashMap<String, Object>() {{
+                put("email", email);
+                put("password", "johnnyjacob");
+                put("username", username);
+            }});
+        }};
+
+        given()
+            .contentType("application/json")
+            .body(param)
+            .when()
+            .post("/users")
+            .then()
+            .statusCode(422)
+            .body("errors.email[0]", equalTo("duplicated email"));
+    }
+}

src/test/java/io/spring/infrastructure/user/MyBatisUserRepositoryTest.java

@@ -0,0 +1,33 @@
+package io.spring.infrastructure.user;
+
+import io.spring.core.user.User;
+import io.spring.core.user.UserRepository;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mybatis.spring.boot.test.autoconfigure.MybatisTest;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.Optional;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.*;
+
+@RunWith(SpringRunner.class)
+@MybatisTest
+@Import(MyBatisUserRepository.class)
+public class MyBatisUserRepositoryTest {
+    @Autowired
+    private UserRepository userRepository;
+
+    @Test
+    public void should_save_and_fetch_user_success() throws Exception {
+        User user = new User("aisensiy@163.com", "aisensiy", "123", "", "default");
+        userRepository.save(user);
+        Optional<User> userOptional = userRepository.findByUsername("aisensiy");
+        assertThat(userOptional.get(), is(user));
+        Optional<User> userOptional2 = userRepository.findByEmail("aisensiy@163.com");
+        assertThat(userOptional2.get(), is(user));
+    }
+}