Add login

2020-01-05 23:20:38 +01:00
parent dc396a300f
commit c0926ffea0
35 changed files with 1647 additions and 39 deletions
--- a/2
+++ b/2
@@ -83,7 +83,7 @@ local-launch-golang: ## Build the server and run it
 		kill $$PID || true
 	$(MAKE) $(BUILD_GOLANG_CMD)
 	DB_PORT=`docker-compose -p $(DOCKER_IMAGE_NAME)-uuid -f containers/docker-compose.local.yml port database 5432  | cut -f2 -d':'`; \
-		$(LAUNCH_GOLANG_CMD) serve --loglevel debug  --logformat text --postgreshost localhost:$$DB_PORT
+		$(LAUNCH_GOLANG_CMD) serve --loglevel debug  --logformat text --dbconnectionuri "postgresql://postgres:postgres@localhost:$$DB_PORT/hamster_tycoon?sslmode=disable"

 .PHONY: local-run
 local-run: local-run-dependencies local-run-golang ## Run the server with its dependencies
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -0,0 +1,102 @@
+package cmd
+
+import (
+	"fmt"
+	"hamster-tycoon/handlers"
+	"hamster-tycoon/utils"
+	"os"
+
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var (
+	config  = &handlers.Config{}
+	cfgFile string
+)
+
+const (
+	parameterConfigurationFile = "config"
+	parameterLogLevel          = "loglevel"
+	parameterMock              = "mock"
+	parameterLogFormat         = "logformat"
+	parameterDBConnectionURI   = "dbconnectionuri"
+	parameterPort              = "port"
+)
+
+var (
+	defaultLogLevel        = logrus.WarnLevel.String()
+	defaultLogFormat       = utils.LogFormatText
+	defaultDBConnectionURI = ""
+	defaultPort            = 8080
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "hamster-tycoon",
+	Short: "hamster-tycoon",
+	Run: func(cmd *cobra.Command, args []string) {
+		utils.InitLogger(config.LogLevel, config.LogFormat)
+
+		logrus.
+			WithField(parameterConfigurationFile, cfgFile).
+			WithField(parameterMock, config.Mock).
+			WithField(parameterLogLevel, config.LogLevel).
+			WithField(parameterLogFormat, config.LogFormat).
+			WithField(parameterPort, config.Port).
+			WithField(parameterDBConnectionURI, config.DBConnectionURI).
+			Warn("Configuration")
+
+		router := handlers.NewRouter(config)
+		router.Run(fmt.Sprintf(":%d", config.Port))
+	},
+}
+
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+
+	rootCmd.PersistentFlags().StringVar(&cfgFile, parameterConfigurationFile, "", "Config file. All flags given in command line will override the values from this file.")
+
+	rootCmd.Flags().String(parameterLogLevel, defaultLogLevel, "Use this flag to set the logging level")
+	viper.BindPFlag(parameterLogLevel, rootCmd.Flags().Lookup(parameterLogLevel))
+
+	rootCmd.Flags().String(parameterLogFormat, defaultLogFormat, "Use this flag to set the logging format")
+	viper.BindPFlag(parameterLogFormat, rootCmd.Flags().Lookup(parameterLogFormat))
+
+	rootCmd.Flags().String(parameterDBConnectionURI, defaultDBConnectionURI, "Use this flag to set the db connection URI")
+	viper.BindPFlag(parameterDBConnectionURI, rootCmd.Flags().Lookup(parameterDBConnectionURI))
+
+	rootCmd.Flags().Int(parameterPort, defaultPort, "Use this flag to set the listening port of the api")
+	viper.BindPFlag(parameterPort, rootCmd.Flags().Lookup(parameterPort))
+
+	rootCmd.Flags().Bool(parameterMock, false, "Use this flag to enable the mock mode")
+	viper.BindPFlag(parameterMock, rootCmd.Flags().Lookup(parameterMock))
+}
+
+// initConfig reads in config file and ENV variables if set.
+func initConfig() {
+	if cfgFile != "" {
+		// Use config file from the flag.
+		viper.SetConfigFile(cfgFile)
+	}
+
+	viper.AutomaticEnv() // read in environment variables that match
+
+	// If a config file is found, read it in.
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Println("Using config file:", viper.ConfigFileUsed())
+	}
+
+	config.LogLevel = viper.GetString(parameterLogLevel)
+	config.LogFormat = viper.GetString(parameterLogFormat)
+	config.Mock = viper.GetBool(parameterMock)
+	config.DBConnectionURI = viper.GetString(parameterDBConnectionURI)
+	config.Port = viper.GetInt(parameterPort)
+}
--- a/containers/docker-compose.local.yml
+++ b/containers/docker-compose.local.yml
@@ -0,0 +1,35 @@
+version: "2.1"
+
+services:
+  database:
+    image: postgres:10-alpine
+    environment:
+      - POSTGRES_DB=hamster_tycoon
+    ports:
+      - "5432"
+    healthcheck:
+      test: ["CMD-SHELL", "psql -U postgres -c 'SELECT 1;'"]
+      interval: 10s
+      timeout: 30s
+      retries: 3
+
+  liquibase:
+    image: kilna/liquibase-postgres
+    depends_on:
+      database:
+        condition: service_healthy
+    links:
+      - database
+    environment:
+      - LIQUIBASE_DATABASE=postgres
+      - LIQUIBASE_HOST=database
+      - LIQUIBASE_USERNAME=postgres
+      - LIQUIBASE_PASSWORD=password
+      - LIQUIBASE_CHANGELOG=/changelogs/changelog-master.xml
+      - LIQUIBASE_URL=jdbc:postgresql://database:5432/postgres
+    volumes:
+      - $PWD/liquibase/changelogs/:/workspace
+    command:
+      - liquibase
+      - --defaultsFile=/workspace/liquibase.properties
+      - update
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,14 @@ module hamster-tycoon
 go 1.13

 require (
-	github.com/DATA-DOG/godog v0.7.13
-	github.com/cweill/gotests v1.5.3 // indirect
-	golang.org/x/tools v0.0.0-20190919180025-928b73f71f9b // indirect
+	github.com/allegro/bigcache v1.2.1
+	github.com/gin-contrib/cors v1.3.0
+	github.com/gin-gonic/gin v1.5.0
+	github.com/lib/pq v1.3.0
+	github.com/satori/go.uuid v1.2.0
+	github.com/sirupsen/logrus v1.4.2
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/viper v1.6.1
+	google.golang.org/api v0.15.0
+	gopkg.in/go-playground/validator.v9 v9.31.0
 )
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,279 @@
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--- a/hamster_tycoon/hamster.go
+++ b/hamster_tycoon/hamster.go
@@ -17,7 +17,7 @@ const (
 const (
 	TotalGestationPeriod = 15
 	MinChild             = 5
-	MaxChild              = 9
+	MaxChild             = 9
 	GestationCooldown    = (3 * 7) + 2
 	GestationMinAge      = 10 * 6
 	MaxAge               = 365 * 2
--- a/hamster_tycoon/hamster_test.go
+++ b/hamster_tycoon/hamster_test.go
@@ -161,9 +161,9 @@ func TestHamster_Fuck(t *testing.T) {
 			if tc.expectedResult {
 				var female *Hamster
 				if FEMALE == tc.hamster1.Sexe {
-					female=tc.hamster1
+					female = tc.hamster1
 				} else {
-					female=tc.hamster2
+					female = tc.hamster2
 				}
 				if !female.Gestation {
 					t.Errorf("Female is not in gestation")
@@ -171,7 +171,7 @@ func TestHamster_Fuck(t *testing.T) {
 				if female.GestationPeriod != 0 {
 					t.Errorf("Gestation period doesn't have been reseted")
 				}
-				if female.GestationCooldown != TotalGestationPeriod + GestationCooldown {
+				if female.GestationCooldown != TotalGestationPeriod+GestationCooldown {
 					t.Errorf("Gestation period doesn't have been reseted")
 				}
 			}
@@ -207,21 +207,20 @@ func TestBorn(t *testing.T) {

 func Test_randSexe(t *testing.T) {
 	tests := []struct {
-		name string
-		want string
+		name    string
+		want    string
 		fakeGen int
 	}{
 		{
-			name: "Should be a male",
+			name:    "Should be a male",
 			fakeGen: 1,
-			want: MALE,
+			want:    MALE,
 		},
 		{
-			name: "Should be a female",
+			name:    "Should be a female",
 			fakeGen: 0,
-			want: FEMALE,
+			want:    FEMALE,
 		},
-
 	}
 	for _, tt := range tests {
 		randomizer.FakeRandomizer(tt.fakeGen)
@@ -237,10 +236,10 @@ func Test_randNumber(t *testing.T) {
 		max int
 	}
 	tests := []struct {
-		name string
-		args args
+		name    string
+		args    args
 		fakeGen int
-		want int
+		want    int
 	}{
 		{
 			name: "Should add min to result",
@@ -249,7 +248,7 @@ func Test_randNumber(t *testing.T) {
 				max: 2,
 			},
 			fakeGen: 0,
-			want: 1,
+			want:    1,
 		},
 	}
 	for _, tt := range tests {
--- a/handlers/handler.go
+++ b/handlers/handler.go
@@ -0,0 +1,94 @@
+package handlers
+
+import (
+	"hamster-tycoon/middlewares"
+	"hamster-tycoon/service"
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/storage/dao/fake"
+	"hamster-tycoon/storage/dao/postgresql"
+	"hamster-tycoon/storage/validators"
+	"net/http"
+	"time"
+
+	"reflect"
+	"strings"
+
+	"github.com/gin-contrib/cors"
+	"github.com/gin-gonic/gin"
+	"gopkg.in/go-playground/validator.v9"
+)
+
+type Config struct {
+	Mock            bool
+	DBConnectionURI string
+	Port            int
+	LogLevel        string
+	LogFormat       string
+}
+
+type handlersContext struct {
+	db          dao.Database
+	validator   *validator.Validate
+	userService *service.UserService
+}
+
+func NewRouter(config *Config) *gin.Engine {
+	gin.SetMode(gin.ReleaseMode)
+
+	router := gin.New()
+	router.HandleMethodNotAllowed = true
+
+	router.Use(cors.New(cors.Config{
+		AllowOrigins:     []string{"*"},
+		AllowMethods:     []string{"*"},
+		AllowHeaders:     []string{"*"},
+		ExposeHeaders:    []string{"*"},
+		AllowCredentials: true,
+		MaxAge:           12 * time.Hour,
+	}))
+	router.Use(gin.Recovery())
+	router.Use(middlewares.GetLoggerMiddleware())
+	router.Use(middlewares.GetHTTPLoggerMiddleware())
+
+	hc := &handlersContext{}
+	if config.Mock {
+		hc.db = fake.NewDatabaseFake()
+	} else {
+		hc.db = postgresql.NewDatabasePostgreSQL(config.DBConnectionURI)
+	}
+	hc.validator = newValidator()
+	hc.userService = service.NewUserService(hc.db)
+	public := router.Group("/")
+	public.Handle(http.MethodGet, "/_health", hc.GetHealth)
+
+	public.Handle("LOGIN", "/users", hc.ConnectUser)
+	// start: user routes
+	public.Handle(http.MethodGet, "/users", hc.GetAllUsers)
+	public.Handle(http.MethodPost, "/users", hc.CreateUser)
+	public.Handle(http.MethodGet, "/users/:id", hc.GetUser)
+	public.Handle(http.MethodPut, "/users/:id", hc.UpdateUser)
+	public.Handle(http.MethodDelete, "/users/:id", hc.DeleteUser)
+	// end: user routes
+
+	return router
+}
+
+func newValidator() *validator.Validate {
+	va := validator.New()
+
+	va.RegisterTagNameFunc(func(fld reflect.StructField) string {
+		name := strings.SplitN(fld.Tag.Get("json"), ",", 2)
+		if len(name) < 1 {
+			return ""
+		}
+		return name[0]
+	})
+
+	for k, v := range validators.CustomValidators {
+		if v.Validator != nil {
+			va.RegisterValidationCtx(k, v.Validator)
+		}
+	}
+
+	return va
+}
--- a/handlers/health_handler.go
+++ b/handlers/health_handler.go
@@ -0,0 +1,12 @@
+package handlers
+
+import (
+	"hamster-tycoon/utils"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (hc *handlersContext) GetHealth(c *gin.Context) {
+	utils.JSON(c.Writer, http.StatusNoContent, nil)
+}
--- a/handlers/user_handler.go
+++ b/handlers/user_handler.go
@@ -0,0 +1,264 @@
+package handlers
+
+import (
+	"encoding/json"
+	"fmt"
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/storage/model"
+	"hamster-tycoon/storage/validators"
+	"hamster-tycoon/utils"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"google.golang.org/api/oauth2/v2"
+)
+
+var httpClient = &http.Client{}
+
+func (hc *handlersContext) GetAllUsers(c *gin.Context) {
+	users, err := hc.db.GetAllUsers()
+	if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while getting users")
+		utils.JSONErrorWithMessage(c.Writer, model.ErrInternalServer, "Error while getting users")
+		return
+	}
+	utils.JSON(c.Writer, http.StatusOK, users)
+}
+
+func (hc *handlersContext) ConnectUser(c *gin.Context) {
+	authorizationHeader := c.GetHeader("Authorization")
+	authorizationHeaderSplitted := strings.Split(authorizationHeader, " ")
+	if len(authorizationHeaderSplitted) != 2 {
+		utils.JSONError(c.Writer, model.ErrBadRequestFormat)
+		return
+	}
+
+	oauth2Service, err := oauth2.New(httpClient)
+	tokenInfoCall := oauth2Service.Tokeninfo()
+	tokenInfoCall.IdToken(authorizationHeaderSplitted[1])
+	tokenInfo, err := tokenInfoCall.Do()
+	if err != nil {
+		utils.GetLogger().WithError(err).Error(err)
+		utils.JSONError(c.Writer, model.ErrBadRequestFormat)
+		return
+	}
+	user, err := hc.userService.GetUserFromGoogleId(tokenInfo.UserId)
+	if err != nil {
+		utils.GetLogger().WithError(err).Error(err)
+		if castedError, ok := err.(*model.APIError); ok {
+			if castedError.Type == model.ErrNotFound.Type {
+				user, err := hc.userService.CreateUserFromGoogleToken(tokenInfo.UserId, tokenInfo.Email)
+				if err != nil {
+					fmt.Println(err)
+					utils.JSONError(c.Writer, model.ErrInternalServer)
+					return
+				}
+				utils.JSON(c.Writer, 200, user)
+				return
+			}
+			utils.JSONError(c.Writer, *castedError)
+			return
+		}
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	utils.JSON(c.Writer, 200, user)
+}
+func (hc *handlersContext) CreateUser(c *gin.Context) {
+	b, err := c.GetRawData()
+	if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while creating user, read data fail")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	userToCreate := model.UserEditable{}
+	err = json.Unmarshal(b, &userToCreate)
+	if err != nil {
+		utils.JSONError(c.Writer, model.ErrBadRequestFormat)
+		return
+	}
+
+	err = hc.validator.StructCtx(c, userToCreate)
+	if err != nil {
+		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
+		return
+	}
+
+	user := model.User{
+		UserEditable: userToCreate,
+	}
+
+	err = hc.db.CreateUser(&user)
+	if e, ok := err.(*dao.DAOError); ok {
+		switch {
+		case e.Type == dao.ErrTypeDuplicate:
+			utils.JSONErrorWithMessage(c.Writer, model.ErrAlreadyExists, "User already exists")
+			return
+		default:
+			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error CreateUser: Error type not handled")
+			utils.JSONError(c.Writer, model.ErrInternalServer)
+			return
+		}
+	} else if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while creating user")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	utils.JSON(c.Writer, http.StatusCreated, user)
+}
+
+func (hc *handlersContext) GetUser(c *gin.Context) {
+	userID := c.Param("id")
+
+	err := hc.validator.VarCtx(c, userID, "uuid4")
+	if err != nil {
+		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
+		return
+	}
+
+	user, err := hc.db.GetUsersByID(userID)
+	if e, ok := err.(*dao.DAOError); ok {
+		switch {
+		case e.Type == dao.ErrTypeNotFound:
+			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "User not found")
+			return
+		default:
+			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error GetUser: get user error type not handled")
+			utils.JSONError(c.Writer, model.ErrInternalServer)
+			return
+		}
+	} else if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while get user")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	if user == nil {
+		utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "User not found")
+		return
+	}
+
+	utils.JSON(c.Writer, http.StatusOK, user)
+}
+
+func (hc *handlersContext) DeleteUser(c *gin.Context) {
+	userID := c.Param("id")
+
+	err := hc.validator.VarCtx(c, userID, "uuid4")
+	if err != nil {
+		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
+		return
+	}
+
+	// check user id given in URL exists
+	_, err = hc.db.GetUsersByID(userID)
+	if e, ok := err.(*dao.DAOError); ok {
+		switch {
+		case e.Type == dao.ErrTypeNotFound:
+			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "User to delete not found")
+			return
+		default:
+			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error DeleteUser: get user error type not handled")
+			utils.JSONError(c.Writer, model.ErrInternalServer)
+			return
+		}
+	} else if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while get user to delete")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	err = hc.db.DeleteUser(userID)
+	if e, ok := err.(*dao.DAOError); ok {
+		switch {
+		case e.Type == dao.ErrTypeNotFound:
+			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "User to delete not found")
+			return
+		default:
+			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error DeleteUser: Error type not handled")
+			utils.JSONError(c.Writer, model.ErrInternalServer)
+			return
+		}
+	} else if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while deleting user")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	utils.JSON(c.Writer, http.StatusNoContent, nil)
+}
+
+func (hc *handlersContext) UpdateUser(c *gin.Context) {
+	userID := c.Param("id")
+
+	err := hc.validator.VarCtx(c, userID, "uuid4")
+	if err != nil {
+		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
+		return
+	}
+
+	// check user id given in URL exists
+	user, err := hc.db.GetUsersByID(userID)
+	if e, ok := err.(*dao.DAOError); ok {
+		switch {
+		case e.Type == dao.ErrTypeNotFound:
+			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "User to update not found")
+			return
+		default:
+			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("deleteUser: get user error type not handled")
+			utils.JSONError(c.Writer, model.ErrInternalServer)
+			return
+		}
+	} else if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while get user to update")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	// get body and verify data
+	b, err := c.GetRawData()
+	if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while updating user, read data fail")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	userToUpdate := model.UserEditable{}
+	err = json.Unmarshal(b, &userToUpdate)
+	if err != nil {
+		utils.JSONError(c.Writer, model.ErrBadRequestFormat)
+		return
+	}
+
+	err = hc.validator.StructCtx(c, userToUpdate)
+	if err != nil {
+		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
+		return
+	}
+
+	user.UserEditable = userToUpdate
+
+	// make the update
+	err = hc.db.UpdateUser(user)
+	if e, ok := err.(*dao.DAOError); ok {
+		switch {
+		case e.Type == dao.ErrTypeNotFound:
+			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "User to update not found")
+			return
+		default:
+			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error UpdateUser: Error type not handled")
+			utils.JSONError(c.Writer, model.ErrInternalServer)
+			return
+		}
+	} else if err != nil {
+		utils.GetLoggerFromCtx(c).WithError(err).Error("error while deleting user")
+		utils.JSONError(c.Writer, model.ErrInternalServer)
+		return
+	}
+
+	utils.JSON(c.Writer, http.StatusOK, user)
+}
--- a/liquibase/changelogs/changelog-master.xml
+++ b/liquibase/changelogs/changelog-master.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<databaseChangeLog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.5.xsd">
+    <include file="prepare-database.sql" relativeToChangelogFile="true"/>
+    <include file="changeset/create-user.xml" relativeToChangelogFile="true"/>
+</databaseChangeLog>
--- a/liquibase/changelogs/changeset/create-user.xml
+++ b/liquibase/changelogs/changeset/create-user.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<databaseChangeLog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.5.xsd">
+    <changeSet id="add-user-table" author="kratisto">
+        <createTable tableName="user">
+            <column name="id" type="uuid" defaultValueComputed="gen_random_uuid()">
+                <constraints nullable="false" unique="true"/>
+            </column>
+            <column name="created_at" type="timestamp" defaultValueComputed="now()">
+                <constraints nullable="true"/>
+            </column>
+            <column name="updated_at" type="timestamp">
+                <constraints nullable="true"/>
+            </column>
+            <column name="google_id" type="text" >
+                <constraints nullable="false" unique="true"/>
+            </column>
+            <column name="nickname" type="text">
+                <constraints nullable="false" unique="true"/>
+            </column>
+            <column name="email" type="text">
+                <constraints nullable="false" unique="true"/>
+            </column>
+        </createTable>
+    </changeSet>
+</databaseChangeLog>
--- a/liquibase/changelogs/liquibase.properties
+++ b/liquibase/changelogs/liquibase.properties
@@ -0,0 +1,6 @@
+url=jdbc:postgresql://database:5432/hamster_tycoon
+username=postgres
+password=password
+changeLogFile=changelog-master.xml
+logLevel=info
+classpath=postgresql-42.2.9.jar
--- a/liquibase/changelogs/postgresql-42.2.9.jar
+++ b/liquibase/changelogs/postgresql-42.2.9.jar
--- a/liquibase/changelogs/prepare-database.sql
+++ b/liquibase/changelogs/prepare-database.sql
@@ -0,0 +1,3 @@
+
+CREATE SCHEMA IF NOT EXISTS hamster_tycoon;
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
--- a/main.go
+++ b/main.go
@@ -1,7 +1,7 @@
 package main

 import (
-	"fmt"
+	"hamster-tycoon/cmd"
 	"math/rand"
 	"time"
 )
@@ -10,11 +10,5 @@ func init() {
 	rand.Seed(time.Now().UTC().UnixNano())
 }
 func main() {
-
-	fmt.Print("hello")
-
-	for  {
-		fmt.Println("Infinite Loop 1")
-		time.Sleep(time.Second)
-	}
+	cmd.Execute()
 }
--- a/middlewares/logger.go
+++ b/middlewares/logger.go
@@ -0,0 +1,71 @@
+package middlewares
+
+import (
+	"hamster-tycoon/utils"
+	"math/rand"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	letterBytes   = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	letterIdxBits = 6                    // 6 bits to represent a letter index
+	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
+	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
+)
+
+var src = rand.NewSource(time.Now().UnixNano())
+
+func randStringBytesMaskImprSrc(n int) string {
+	b := make([]byte, n)
+	// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
+	for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
+		if remain == 0 {
+			cache, remain = src.Int63(), letterIdxMax
+		}
+		if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
+			b[i] = letterBytes[idx]
+			i--
+		}
+		cache >>= letterIdxBits
+		remain--
+	}
+
+	return string(b)
+}
+
+func GetLoggerMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		correlationID := c.Request.Header.Get(utils.HeaderNameCorrelationID)
+		if correlationID == "" {
+			correlationID = randStringBytesMaskImprSrc(30)
+			c.Writer.Header().Set(utils.HeaderNameCorrelationID, correlationID)
+		}
+
+		logger := utils.GetLogger()
+		logEntry := logger.WithField(utils.HeaderNameCorrelationID, correlationID)
+
+		c.Set(utils.ContextKeyLogger, logEntry)
+	}
+}
+
+func GetHTTPLoggerMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		start := time.Now()
+
+		utils.GetLoggerFromCtx(c).
+			WithField("method", c.Request.Method).
+			WithField("url", c.Request.RequestURI).
+			WithField("from", c.ClientIP()).
+			Info("start handling HTTP request")
+
+		c.Next()
+		d := time.Since(start)
+
+		utils.GetLoggerFromCtx(c).
+			WithField("status", c.Writer.Status()).
+			WithField("duration", d.String()).
+			Info("end handling HTTP request")
+	}
+}
--- a/randomizer/rand.go
+++ b/randomizer/rand.go
@@ -9,7 +9,8 @@ type Random interface {
 	Int() int
 }

-func init(){}
+func init() {}
+
 type rndGenerator func(n int) int

 type Randomizer struct {
@@ -29,13 +30,14 @@ func Rand(rand int) int {
 }
 func realRand(n int) int { return int(rand.Intn(n)) }
 func fakeRand(n int) func(numb int) int {
-	return func(numb int)int {
+	return func(numb int) int {
 		if n >= numb {
-			panic(fmt.Sprintf("%d Should not be superior of %d",n,numb))
+			panic(fmt.Sprintf("%d Should not be superior of %d", n, numb))
 		}
 		return n
+	}
 }
-}
+
 var randGen = NewRandomizer(realRand).Int

 func FakeRandomizer(n int) {
--- a/service/service.go
+++ b/service/service.go
@@ -0,0 +1,7 @@
+package service
+
+import "hamster-tycoon/storage/dao"
+
+type serviceContext struct {
+	db dao.Database
+}
--- a/service/user_service.go
+++ b/service/user_service.go
@@ -0,0 +1,39 @@
+package service
+
+import (
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/storage/model"
+	"hamster-tycoon/utils"
+)
+
+type UserService struct {
+	serviceContext
+}
+
+func NewUserService(database dao.Database) *UserService {
+	return &UserService{serviceContext{db: database}}
+}
+
+func (us *UserService) GetUserFromGoogleId(googleUserId string) (*model.User, error) {
+	user, err := us.db.GetUsersByGoogleID(googleUserId)
+	if err != nil {
+		if castedError, ok := err.(*dao.DAOError); ok {
+			switch castedError.Type {
+			case dao.ErrTypeNotFound:
+				return nil, &model.ErrNotFound
+			default:
+				return nil, &model.ErrInternalServer
+			}
+		}
+		return nil, &model.ErrInternalServer
+	}
+	return user, nil
+}
+
+func (us *UserService) CreateUserFromGoogleToken(id string, email string) (*model.User, error) {
+	randNick := utils.String(20)
+	user := &model.User{UserEditable: model.UserEditable{Email: email, Nickname: "player-" + randNick}, GoogleId: id}
+	err := us.db.CreateUser(user)
+	return user, err
+
+}
--- a/storage/dao/database.go
+++ b/storage/dao/database.go
@@ -0,0 +1,18 @@
+package dao
+
+import (
+	"hamster-tycoon/storage/model"
+)
+
+type Database interface {
+
+	// start: user dao funcs
+	GetAllUsers() ([]*model.User, error)
+	GetUsersByID(string) (*model.User, error)
+	GetUsersByGoogleID(string) (*model.User, error)
+	CreateUser(*model.User) error
+	DeleteUser(string) error
+	UpdateUser(*model.User) error
+	// end: user dao funcs
+
+}
--- a/storage/dao/database_error.go
+++ b/storage/dao/database_error.go
@@ -0,0 +1,32 @@
+package dao
+
+import (
+	"fmt"
+)
+
+type Type int
+
+const (
+	ErrTypeNotFound Type = iota
+	ErrTypeDuplicate
+	ErrTypeForeignKeyViolation
+)
+
+type DAOError struct {
+	Cause error
+	Type  Type
+}
+
+func NewDAOError(t Type, cause error) error {
+	return &DAOError{
+		Type:  t,
+		Cause: cause,
+	}
+}
+
+func (e *DAOError) Error() string {
+	if e.Cause != nil {
+		return fmt.Sprintf("Type %d: %s", e.Type, e.Cause.Error())
+	}
+	return fmt.Sprintf("Type %d: no cause given", e.Type)
+}
--- a/storage/dao/fake/database_fake.go
+++ b/storage/dao/fake/database_fake.go
@@ -0,0 +1,37 @@
+package fake
+
+import (
+	"encoding/json"
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/utils"
+	"time"
+
+	"github.com/allegro/bigcache"
+)
+
+type DatabaseFake struct {
+	Cache *bigcache.BigCache
+}
+
+func NewDatabaseFake() dao.Database {
+	cache, err := bigcache.NewBigCache(bigcache.DefaultConfig(time.Minute))
+	if err != nil {
+		utils.GetLogger().WithError(err).Fatal("Error while instantiate cache")
+	}
+	return &DatabaseFake{
+		Cache: cache,
+	}
+}
+
+func (db *DatabaseFake) save(key string, data []interface{}) {
+	b, err := json.Marshal(data)
+	if err != nil {
+		utils.GetLogger().WithError(err).Errorf("Error while marshal fake %s", key)
+		db.Cache.Set(key, []byte("[]"))
+		return
+	}
+	err = db.Cache.Set(key, b)
+	if err != nil {
+		utils.GetLogger().WithError(err).Errorf("Error while saving fake %s", key)
+	}
+}
--- a/storage/dao/fake/database_fake_users.go
+++ b/storage/dao/fake/database_fake_users.go
@@ -0,0 +1,106 @@
+package fake
+
+import (
+	"encoding/json"
+	"errors"
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/storage/model"
+	"hamster-tycoon/utils"
+	"time"
+
+	"github.com/satori/go.uuid"
+)
+
+const (
+	cacheKeyUsers = "users"
+)
+
+func (db *DatabaseFake) saveUsers(users []*model.User) {
+	data := make([]interface{}, 0)
+	for _, v := range users {
+		data = append(data, v)
+	}
+	db.save(cacheKeyUsers, data)
+}
+
+func (db *DatabaseFake) loadUsers() []*model.User {
+	users := make([]*model.User, 0)
+	b, err := db.Cache.Get(cacheKeyUsers)
+	if err != nil {
+		return users
+	}
+	err = json.Unmarshal(b, &users)
+	if err != nil {
+		utils.GetLogger().WithError(err).Error("Error while unmarshal fake users")
+	}
+	return users
+}
+
+func (db *DatabaseFake) GetAllUsers() ([]*model.User, error) {
+	return db.loadUsers(), nil
+}
+
+func (db *DatabaseFake) GetUsersByID(userID string) (*model.User, error) {
+	users := db.loadUsers()
+	for _, u := range users {
+		if u.ID == userID {
+			return u, nil
+		}
+	}
+	return nil, dao.NewDAOError(dao.ErrTypeNotFound, errors.New("user not found"))
+}
+
+func (db *DatabaseFake) CreateUser(user *model.User) error {
+	user.ID = uuid.NewV4().String()
+	user.CreatedAt = time.Now()
+
+	users := db.loadUsers()
+	users = append(users, user)
+	db.saveUsers(users)
+	return nil
+}
+
+func (db *DatabaseFake) DeleteUser(userID string) error {
+	users := db.loadUsers()
+	newUsers := make([]*model.User, 0)
+	for _, u := range users {
+		if u.ID != userID {
+			newUsers = append(newUsers, u)
+		}
+	}
+	db.saveUsers(newUsers)
+	return nil
+}
+
+func (db *DatabaseFake) UpdateUser(user *model.User) error {
+	users := db.loadUsers()
+	var foundUser *model.User
+	for _, u := range users {
+		if u.ID == user.ID {
+			foundUser = u
+			break
+		}
+	}
+
+	if foundUser == nil {
+		return dao.NewDAOError(dao.ErrTypeNotFound, errors.New("user not found"))
+	}
+
+	foundUser.UserEditable = user.UserEditable
+	now := time.Now()
+	foundUser.UpdatedAt = &now
+	db.saveUsers(users)
+
+	*user = *foundUser
+	return nil
+}
+
+func (db *DatabaseFake) GetUsersByGoogleID(userID string) (*model.User, error) {
+	users := db.loadUsers()
+	for _, u := range users {
+		if u.GoogleId == userID {
+			return u, nil
+		}
+	}
+	return nil, dao.NewDAOError(dao.ErrTypeNotFound, errors.New("user not found"))
+}
--- a/storage/dao/postgresql/database_postgresql.go
+++ b/storage/dao/postgresql/database_postgresql.go
@@ -0,0 +1,43 @@
+package postgresql
+
+import (
+	"database/sql"
+	"fmt"
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/utils"
+
+	"github.com/lib/pq"
+)
+
+const (
+	pgCodeUniqueViolation     = "23505"
+	pgCodeForeingKeyViolation = "23503"
+)
+
+func handlePgError(e *pq.Error) error {
+	if e.Code == pgCodeUniqueViolation {
+		return dao.NewDAOError(dao.ErrTypeDuplicate, e)
+	}
+
+	if e.Code == pgCodeForeingKeyViolation {
+		return dao.NewDAOError(dao.ErrTypeForeignKeyViolation, e)
+	}
+	return e
+}
+
+type DatabasePostgreSQL struct {
+	session *sql.DB
+}
+
+func NewDatabasePostgreSQL(connectionURI string) dao.Database {
+	db, err := sql.Open("postgres", connectionURI)
+	if err != nil {
+		utils.GetLogger().WithError(err).Fatal("Unable to get a connection to the postgres db")
+	}
+	err = db.Ping()
+	if err != nil {
+		fmt.Println(err)
+		utils.GetLogger().WithError(err).Fatal("Unable to ping the postgres db")
+	}
+	return &DatabasePostgreSQL{session: db}
+}
--- a/storage/dao/postgresql/database_postgresql_user.go
+++ b/storage/dao/postgresql/database_postgresql_user.go
@@ -0,0 +1,119 @@
+package postgresql
+
+import (
+	"database/sql"
+	"hamster-tycoon/storage/dao"
+	"hamster-tycoon/storage/model"
+
+	"github.com/lib/pq"
+)
+
+func (db *DatabasePostgreSQL) GetAllUsers() ([]*model.User, error) {
+	q := `
+		SELECT u.id, u.email, u.created_at, u.updated_at, u.nickname
+		FROM public.user u
+	`
+	rows, err := db.session.Query(q)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	us := make([]*model.User, 0)
+	for rows.Next() {
+		u := model.User{}
+		err := rows.Scan(&u.ID, &u.Email, &u.CreatedAt, &u.UpdatedAt, &u.Nickname)
+		if err != nil {
+			return nil, err
+		}
+		us = append(us, &u)
+	}
+	return us, nil
+}
+
+func (db *DatabasePostgreSQL) GetUsersByID(id string) (*model.User, error) {
+	q := `
+		SELECT u.id, u.email, u.created_at, u.updated_at, u.nickname
+		FROM public.user u
+		WHERE u.id = $1
+	`
+	row := db.session.QueryRow(q, id)
+
+	u := model.User{}
+	err := row.Scan(&u.ID, &u.Email, &u.CreatedAt, &u.UpdatedAt, &u.Nickname)
+	if errPq, ok := err.(*pq.Error); ok {
+		return nil, handlePgError(errPq)
+	}
+	if err == sql.ErrNoRows {
+		return nil, dao.NewDAOError(dao.ErrTypeNotFound, err)
+	}
+	return &u, err
+}
+
+func (db *DatabasePostgreSQL) CreateUser(user *model.User) error {
+	q := `
+		INSERT INTO public.user
+			(email, nickname, google_id)
+		VALUES
+			($1, $2, $3)
+		RETURNING id, created_at
+	`
+
+	err := db.session.
+		QueryRow(q, user.Email, user.Nickname, user.GoogleId).
+		Scan(&user.ID, &user.CreatedAt)
+	if errPq, ok := err.(*pq.Error); ok {
+		return handlePgError(errPq)
+	}
+	return err
+}
+
+func (db *DatabasePostgreSQL) DeleteUser(id string) error {
+	q := `
+		DELETE FROM public.user
+		WHERE id = $1
+	`
+
+	_, err := db.session.Exec(q, id)
+	if errPq, ok := err.(*pq.Error); ok {
+		return handlePgError(errPq)
+	}
+	return err
+}
+
+func (db *DatabasePostgreSQL) UpdateUser(user *model.User) error {
+	q := `
+		UPDATE public.user
+		SET
+			email = $2
+		WHERE id = $1
+		RETURNING updated_at
+	`
+
+	err := db.session.
+		QueryRow(q, user.ID, user.Email).
+		Scan(&user.UpdatedAt)
+	if errPq, ok := err.(*pq.Error); ok {
+		return handlePgError(errPq)
+	}
+	return err
+}
+
+func (db *DatabasePostgreSQL) GetUsersByGoogleID(id string) (*model.User, error) {
+	q := `
+		SELECT u.id, u.email, u.created_at, u.updated_at, u.nickname, u.google_id
+		FROM public.user u
+		WHERE u.google_id = $1
+	`
+	row := db.session.QueryRow(q, id)
+
+	u := model.User{}
+	err := row.Scan(&u.ID, &u.Email, &u.CreatedAt, &u.UpdatedAt, &u.Nickname, &u.GoogleId)
+	if errPq, ok := err.(*pq.Error); ok {
+		return nil, handlePgError(errPq)
+	}
+	if err == sql.ErrNoRows {
+		return nil, dao.NewDAOError(dao.ErrTypeNotFound, err)
+	}
+	return &u, err
+}
--- a/storage/model/error.go
+++ b/storage/model/error.go
@@ -0,0 +1,67 @@
+package model
+
+import (
+	"fmt"
+	"github.com/lib/pq"
+	"net/http"
+)
+
+var (
+	// 400
+	ErrBadRequestFormat = APIError{
+		Type:        "bad_format",
+		HTTPCode:    http.StatusBadRequest,
+		Description: "unable to read request body, please check that the json is valid",
+	}
+	ErrDataValidation = APIError{
+		Type:        "data_validation",
+		HTTPCode:    http.StatusBadRequest,
+		Description: "the data are not valid",
+	}
+
+	// 404
+	ErrNotFound = APIError{
+		Type:     "not_found",
+		HTTPCode: http.StatusNotFound,
+	}
+
+	// 40x
+	ErrAlreadyExists = APIError{
+		Type:     "already_exists",
+		HTTPCode: http.StatusConflict,
+	}
+
+	// 50x
+	ErrInternalServer = APIError{
+		Type:     "internal_server_error",
+		HTTPCode: http.StatusInternalServerError,
+	}
+)
+
+type APIError struct {
+	HTTPCode    int                 `json:"-"`
+	Type        string              `json:"error"`
+	Description string              `json:"error_description"`
+	Details     []FieldError        `json:"error_details,omitempty"`
+	Headers     map[string][]string `json:"-"`
+}
+
+type FieldError struct {
+	Field       string `json:"field"`
+	Constraint  string `json:"constraint"`
+	Description string `json:"description"`
+}
+
+func (e *APIError) Error() string {
+	return fmt.Sprintf("error : %d, %s, %s, %v", e.HTTPCode, e.Type, e.Description, e.Details)
+}
+
+func FromPostgresError(err *pq.Error) *APIError {
+	return &APIError{
+		HTTPCode:    0,
+		Type:        "",
+		Description: "",
+		Details:     nil,
+		Headers:     nil,
+	}
+}
--- a/storage/model/user.go
+++ b/storage/model/user.go
@@ -0,0 +1,16 @@
+package model
+
+import "time"
+
+type User struct {
+	UserEditable
+	ID        string     `json:"id"`
+	CreatedAt time.Time  `json:"createdAt"`
+	UpdatedAt *time.Time `json:"updatedAt"`
+	GoogleId  string     `json:"-"`
+}
+
+type UserEditable struct {
+	Email    string `json:"email" validate:"required"`
+	Nickname string `json:"nickname" validate:"required"`
+}
--- a/storage/model/user_data.go
+++ b/storage/model/user_data.go
@@ -0,0 +1,17 @@
+package model
+
+import "time"
+
+type UserData struct {
+	UserEditable
+	ID        string     `json:"id"`
+	CreatedAt time.Time  `json:"createdAt"`
+	UpdatedAt *time.Time `json:"updatedAt"`
+}
+
+type UserDataEditable struct {
+	UserId  string `json:'userId'`
+	Type    string `json:"type"`
+	Name    string `json:"name"`
+	Content string `json:"content"`
+}
--- a/storage/validators/error.go
+++ b/storage/validators/error.go
@@ -0,0 +1,44 @@
+package validators
+
+import (
+	"fmt"
+	"hamster-tycoon/storage/model"
+	"hamster-tycoon/utils"
+	"regexp"
+	"strings"
+
+	"gopkg.in/go-playground/validator.v9"
+)
+
+var regexpValidatorNamespacePrefix = regexp.MustCompile(`^\w+\.`)
+
+func NewDataValidationAPIError(err error) model.APIError {
+	apiErr := model.ErrDataValidation
+	if err != nil {
+		if _, ok := err.(*validator.InvalidValidationError); ok {
+			utils.GetLogger().WithError(err).WithField("templateAPIErr", apiErr).Error("InvalidValidationError")
+		} else {
+			for _, e := range err.(validator.ValidationErrors) {
+				reason := e.Tag()
+				if _, ok := CustomValidators[e.Tag()]; ok {
+					reason = truncatingSprintf(CustomValidators[e.Tag()].Message, e.Param())
+				}
+
+				namespaceWithoutStructName := regexpValidatorNamespacePrefix.ReplaceAllString(e.Namespace(), "")
+				fe := model.FieldError{
+					Field:       namespaceWithoutStructName,
+					Constraint:  e.Tag(),
+					Description: reason,
+				}
+				apiErr.Details = append(apiErr.Details, fe)
+			}
+		}
+	}
+	return apiErr
+}
+
+// truncatingSprintf is used as fmt.Sprintf but allow to truncate the additional parameters given when there is more parameters than %v in str
+func truncatingSprintf(str string, args ...interface{}) string {
+	n := strings.Count(str, "%v")
+	return fmt.Sprintf(str, args[:n]...)
+}
--- a/storage/validators/validators.go
+++ b/storage/validators/validators.go
@@ -0,0 +1,34 @@
+package validators
+
+import (
+	"context"
+	"strings"
+
+	"gopkg.in/go-playground/validator.v9"
+)
+
+var (
+	CustomValidators = map[string]customValidator{
+		"enum": {
+			Message:   "This field should be in: %v",
+			Validator: validateEnum,
+		},
+		"required": {
+			Message: "This field is required and cannot be empty",
+		},
+	}
+)
+
+type customValidator struct {
+	Message   string
+	Validator validator.FuncCtx
+}
+
+func validateEnum(ctx context.Context, fl validator.FieldLevel) bool {
+	for _, v := range strings.Split(fl.Param(), " ") {
+		if v == fl.Field().String() {
+			return true
+		}
+	}
+	return false
+}
--- a/utils/headers.go
+++ b/utils/headers.go
@@ -0,0 +1,8 @@
+package utils
+
+const (
+	HeaderNameContentType   = "content-type"
+	HeaderNameCorrelationID = "correlationID"
+
+	HeaderValueApplicationJSONUTF8 = "application/json; charset=UTF-8"
+)
--- a/utils/logger.go
+++ b/utils/logger.go
@@ -0,0 +1,74 @@
+package utils
+
+import (
+	"io"
+	"os"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	LogFormatText = "text"
+	LogFormatJSON = "json"
+
+	ContextKeyLogger = "logger"
+)
+
+var (
+	logLevel                   = logrus.DebugLevel
+	logFormat logrus.Formatter = &logrus.TextFormatter{}
+	logOut    io.Writer
+)
+
+func InitLogger(ll, lf string) {
+	logLevel = parseLogrusLevel(ll)
+	logrus.SetLevel(logLevel)
+
+	logFormat = parseLogrusFormat(lf)
+	logrus.SetFormatter(logFormat)
+
+	logOut = os.Stdout
+	logrus.SetOutput(logOut)
+}
+
+func GetLoggerFromCtx(c *gin.Context) *logrus.Entry {
+	if logger, ok := c.Get(ContextKeyLogger); ok {
+		logEntry, assertionOk := logger.(*logrus.Entry)
+		if assertionOk {
+			return logEntry
+		}
+	}
+	return logrus.NewEntry(GetLogger())
+}
+
+func GetLogger() *logrus.Logger {
+	logger := logrus.New()
+	logger.Formatter = logFormat
+	logger.Level = logLevel
+	logger.Out = logOut
+	return logger
+}
+
+func parseLogrusLevel(logLevelStr string) logrus.Level {
+	logLevel, err := logrus.ParseLevel(logLevelStr)
+	if err != nil {
+		logrus.WithError(err).Errorf("error while parsing log level. %v is set as default.", logLevel)
+		logLevel = logrus.DebugLevel
+	}
+	return logLevel
+}
+
+func parseLogrusFormat(logFormatStr string) logrus.Formatter {
+	var formatter logrus.Formatter
+	switch logFormatStr {
+	case LogFormatText:
+		formatter = &logrus.TextFormatter{ForceColors: true, FullTimestamp: true}
+	case LogFormatJSON:
+		formatter = &logrus.JSONFormatter{}
+	default:
+		logrus.Errorf("error while parsing log format. %v is set as default.", formatter)
+		formatter = &logrus.TextFormatter{ForceColors: true, FullTimestamp: true}
+	}
+	return formatter
+}
--- a/utils/rand.go
+++ b/utils/rand.go
@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"math/rand"
+	"time"
+)
+
+const charset = "abcdefghijklmnopqrstuvwxyz" +
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+var seededRand = rand.New(
+	rand.NewSource(time.Now().UnixNano()))
+
+func StringWithCharset(length int, charset string) string {
+	b := make([]byte, length)
+	for i := range b {
+		b[i] = charset[seededRand.Intn(len(charset))]
+	}
+	return string(b)
+}
+
+func String(length int) string {
+	return StringWithCharset(length, charset)
+}
--- a/utils/responses.go
+++ b/utils/responses.go
@@ -0,0 +1,31 @@
+package utils
+
+import (
+	"encoding/json"
+	"hamster-tycoon/storage/model"
+	"net/http"
+)
+
+func JSON(w http.ResponseWriter, status int, data interface{}) {
+	w.Header().Set(HeaderNameContentType, HeaderValueApplicationJSONUTF8)
+	w.WriteHeader(status)
+	if data != nil {
+		json.NewEncoder(w).Encode(data)
+	}
+}
+
+func JSONError(w http.ResponseWriter, e model.APIError) {
+	if e.Headers != nil {
+		for k, headers := range e.Headers {
+			for _, headerValue := range headers {
+				w.Header().Add(k, headerValue)
+			}
+		}
+	}
+	JSON(w, e.HTTPCode, e)
+}
+
+func JSONErrorWithMessage(w http.ResponseWriter, e model.APIError, message string) {
+	e.Description = message
+	JSONError(w, e)
+}