added possible-user-tasks

backend/pkg/db/users/main.go

@@ -0,0 +1,119 @@
+package users
+
+import (
+	"github.com/google/uuid"
+	"github.com/johannesbuehl/golunteer/backend/pkg/db"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type UserName string
+
+type UserDB struct {
+	UserName UserName `db:"userName" json:"userName"`
+	Admin    bool     `db:"admin" json:"admin"`
+}
+
+type User struct {
+	UserDB
+	PossibleTasks []int `json:"possibleTasks"`
+}
+
+type UserChangePassword struct {
+	UserName `json:"userName" validate:"required" db:"userName"`
+	Password string `json:"password" validate:"required,min=12"`
+}
+
+// hashes a password
+func hashPassword(password string) ([]byte, error) {
+	return bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+}
+
+func Get() ([]User, error) {
+	// get the usersDB from the database
+	var usersDB []UserDB
+
+	// get the users
+	if err := db.DB.Select(&usersDB, "SELECT userName, admin FROM USERS"); err != nil {
+		return nil, err
+	} else {
+		users := make([]User, len(usersDB))
+
+		// for the individual users, get the possible tasks
+		for ii, userDB := range usersDB {
+			if user, err := userDB.ToUser(); err != nil {
+				users = append(users[:ii], users[ii+1:]...)
+			} else {
+				users[ii] = user
+			}
+		}
+
+		return users, nil
+	}
+}
+
+func (userName UserName) TokenID() (string, error) {
+	var dbResult struct {
+		TokenID string `db:"tokenID"`
+	}
+
+	err := db.DB.Get(&dbResult, "SELECT tokenID FROM USERS WHERE userName = ?", userName)
+
+	return dbResult.TokenID, err
+}
+
+type UserAdd struct {
+	UserName      `json:"userName" validate:"required" db:"userName"`
+	Password      string `json:"password" validate:"required,min=12,max=64"`
+	Admin         bool   `json:"admin" db:"admin"`
+	PossibleTasks []int  `json:"possibleTasks" validate:"required"`
+}
+
+func Add(user UserAdd) error {
+	// try to hash the password
+	if hash, err := hashPassword(user.Password); err != nil {
+		return err
+	} else {
+		insertUser := struct {
+			UserAdd
+			Password []byte `db:"password"`
+			TokenID  string `db:"tokenID"`
+		}{
+			UserAdd:  user,
+			Password: hash,
+			TokenID:  uuid.NewString(),
+		}
+
+		if _, err := db.DB.NamedExec("INSERT INTO USERS (userName, password, admin, tokenID) VALUES (:userName, :password, :admin, :tokenID)", insertUser); err != nil {
+			return err
+		}
+
+		// set the possible Tasks
+		for _, task := range user.PossibleTasks {
+			if _, err := db.DB.Exec("INSERT INTO USER_TASKS (userName, taskID) VALUES ($1, $2)", user.UserName, task); err != nil {
+				return err
+			}
+		}
+
+		return err
+	}
+}
+
+func Delete(userName string) error {
+	_, err := db.DB.Exec("DELETE FROM USERS WHERE userName = $1", userName)
+
+	return err
+}
+
+func (u *UserDB) ToUser() (User, error) {
+	// get the possible tasks
+	tasks := make([]int, 0)
+
+	if err := db.DB.Select(&tasks, "SELECT taskID FROM USER_TASKS WHERE userName = $1", u.UserName); err != nil {
+		return User{}, err
+	} else {
+		return User{
+			UserDB:        *u,
+			PossibleTasks: tasks,
+		}, nil
+	}
+}