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user.go
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user.go
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package main
import (
"database/sql"
"fmt"
"strings"
"github.com/go-sql-driver/mysql"
)
// User is used for returning user data
type User struct {
UUID string `json:"uuid"`
Email string `json:"email"`
Username string `json:"username"`
Password string `json:"password"`
DateCreated string `json:"date_created"`
LastModified string `json:"last_modified"`
}
// UserNew is used for incoming users to be created
type UserNew struct {
Email string `json:"email"`
Password string `json:"password"`
PasswordHash string `json:"password_hash"`
}
var (
// UserErrorNotFound for errors where user is not found
UserErrorNotFound = "E_USER_NOT_FOUND"
// UserErrorCreateGeneric for generic user creation errors
UserErrorCreateGeneric = "E_USER_CREATE_GENERIC"
// UserErrorCreateDuplicateEntry for errors where a duplicate user is found
UserErrorCreateDuplicateEntry = "E_USER_CREATE_DUPLICATE"
// UserErrorCreateMissingParameters for missing parameters
UserErrorCreateMissingParameters = "E_USER_CREATE_MISSING_PARAMS"
// UserErrorCreateInvalidEmail for invalid emails
UserErrorCreateInvalidEmail = "E_USER_CREATE_INVALID_EMAIL"
// UserErrorCreateInvalidPassword for invalid passwords
UserErrorCreateInvalidPassword = "E_USER_CREATE_INVALID_PASSWORD"
// UserErrorUpdateMissingUUID for when UUID is not provided
UserErrorUpdateMissingUUID = "E_USER_UPDATE_MISSING_UUID"
// UserErrorDeleteMissingUUID for when UUID is not provided
UserErrorDeleteMissingUUID = "E_USER_DELETE_MISSING_UUID"
)
var userStatementsPrepared = false
var user = User{}
/*
-------------------------------------------------------------------------------
USER CREATION
#create #registration #new #account
-------------------------------------------------------------------------------
*/
// Create adds a new account into persistent storage using
// parameters from the :newUser parameter
func (user *User) Create(database *sql.DB, newUser UserNew) *User {
logger.Infof("[user] creating user with email '%s'", newUser.Email)
// validate parameters
if len(newUser.Email) == 0 {
panic(&ModelError{
Code: UserErrorCreateMissingParameters,
Message: "missing 'email' parameter",
})
} else if err := utils.ValidateEmail(newUser.Email); err != nil {
panic(&ModelError{
Code: err.(*ValidationError).Code,
Message: err.(*ValidationError).Message,
Data: map[string]interface{}{"email": newUser.Email},
})
} else if len(newUser.Password) == 0 {
panic(&ModelError{
Code: UserErrorCreateMissingParameters,
Message: "missing 'password' parameter",
})
} else if err := utils.ValidatePassword(newUser.Password); err != nil {
panic(&ModelError{
Code: err.(*ValidationError).Code,
Message: err.(*ValidationError).Message,
Data: map[string]interface{}{}, // reveal nothing, it's the password (:
})
}
userRow := user.create(database, &newUser)
logger.Infof("[user] created user with email '%s' - uuid is '%s'", newUser.Email, userRow.UUID)
return userRow
}
// create executes the database operations for Create()
func (*User) create(database *sql.DB, newUser *UserNew) *User {
if passwordHash, err := utils.CreatePasswordHash(newUser.Password); err != nil {
panic(err)
} else {
newUser.PasswordHash = passwordHash
}
userID := user.createAccount(database, newUser.Email)
user.createSecurity(database, userID, newUser.PasswordHash)
return user.getByID(database, userID)
}
// createAccount adds a new row to the `accounts` table, returns the ID of the
// newly created user
func (*User) createAccount(database *sql.DB, email string) int64 {
logger.Info("[user] adding account data...")
stmt, err := database.Prepare("INSERT INTO accounts (email) VALUES (?)")
if err != nil {
panic(err)
}
output, err := stmt.Exec(email)
if err != nil {
logger.Errorf("[user] %v", err)
switch err.(*mysql.MySQLError).Number {
case 1062:
panic(&ModelError{
Code: UserErrorCreateDuplicateEntry,
Message: "the user already exists",
Data: map[string]interface{}{"email": email},
})
default:
panic(UserErrorCreateGeneric)
}
}
lastInsertID, err := output.LastInsertId()
if err != nil {
panic(err)
}
return lastInsertID
}
// createSecurity adds the security details of the user with ID :id
func (*User) createSecurity(database *sql.DB, id int64, passwordHash string) {
logger.Info("[user] adding account security...")
stmt, err := database.Prepare("INSERT INTO security (account_id, password) VALUES (?, ?)")
if err != nil {
panic(err)
}
result, err := stmt.Exec(id, passwordHash)
if err != nil {
panic(err)
}
rowsAffected, err := result.RowsAffected()
if err != nil {
panic(err)
} else if rowsAffected != 1 {
panic("[user] expected 1 row to be affected but none were")
}
}
/*
-------------------------------------------------------------------------------
USER QUERY
#read #account
-------------------------------------------------------------------------------
*/
// Query queries :limit users given a starting index :startIndex
func (user *User) Query(database *sql.DB, startIndex uint, limit uint) *[]User {
logger.Infof("[user] querying %v users starting from index %v...", limit, startIndex)
users := user.query(database, startIndex, limit)
logger.Infof("[user] queried %v users (requested for %v)", len(*users), limit)
return users
}
func (user *User) query(database *sql.DB, startIndex uint, limit uint) *[]User {
sqlStmt := "SELECT uuid, email, username, date_created, last_modified FROM accounts LIMIT ?,?"
logger.Infof("[user] executing sql '%s'", sqlStmt)
stmt, err := database.Prepare(sqlStmt)
if err != nil {
panic(err)
}
var users []User
rows, err := stmt.Query(startIndex, limit)
defer rows.Close()
if err != nil {
panic(err)
}
for rows.Next() {
var uuid sql.NullString
var email sql.NullString
var username sql.NullString
var dateCreated sql.NullString
var lastModified sql.NullString
err := rows.Scan(&uuid, &email, &username, &dateCreated, &lastModified)
if err != nil {
panic(err)
}
users = append(users, User{
UUID: uuid.String,
Email: email.String,
Username: username.String,
DateCreated: dateCreated.String,
LastModified: lastModified.String,
})
}
return &users
}
// GetByUUID retrieves a user with UUID :uuid
func (user *User) GetByUUID(database *sql.DB, uuid string) *User {
logger.Infof("[user] getting user with UUID '%v'", uuid)
if len(uuid) == 0 {
panic(&ModelError{
Code: UserErrorCreateMissingParameters,
Message: "missing 'uuid' parameter",
})
}
userRow := user.getByUUID(database, uuid)
logger.Infof("[user] retrieved user with uuid '%v'", uuid)
return userRow
}
// getByUUID executes the database operations for GetByUUID()
func (*User) getByUUID(database *sql.DB, uuid string) *User {
sqlStmt := "SELECT email, username, date_created, last_modified FROM accounts WHERE uuid = ?"
logger.Infof("[user] executing sql '%s'", sqlStmt)
stmt, err := database.Prepare(sqlStmt)
if err != nil {
panic(err)
}
row := stmt.QueryRow(uuid)
if err != nil {
logger.Errorf("[user] %v", err)
panic(err)
}
var email sql.NullString
var username sql.NullString
var dateCreated sql.NullString
var lastModified sql.NullString
err = row.Scan(&email, &username, &dateCreated, &lastModified)
if err != nil {
if err == sql.ErrNoRows {
panic(&ModelError{
Code: UserErrorNotFound,
Message: fmt.Sprintf("the user identified by %s does not exist", uuid),
})
} else {
panic(err)
}
}
return &User{
UUID: uuid,
Email: email.String,
Username: username.String,
DateCreated: dateCreated.String,
LastModified: lastModified.String,
}
}
// getById executes the database operations to retrieve a user identified by
// the ID :id
func (*User) getByID(database *sql.DB, id int64) *User {
sqlStmt := "SELECT uuid, email, username, date_created, last_modified FROM accounts WHERE id = ?"
logger.Infof("[user] executing sql '%s'", sqlStmt)
stmt, err := database.Prepare(sqlStmt)
if err != nil {
panic(err)
}
row := stmt.QueryRow(id)
if err != nil {
panic(err)
}
var uuid sql.NullString
var email sql.NullString
var username sql.NullString
var dateCreated sql.NullString
var lastModified sql.NullString
err = row.Scan(&uuid, &email, &username, &dateCreated, &lastModified)
if err != nil {
panic(err)
}
return &User{
UUID: uuid.String,
Email: email.String,
Username: username.String,
DateCreated: dateCreated.String,
LastModified: lastModified.String,
}
}
/*
-------------------------------------------------------------------------------
USER UPDATING
#update
-------------------------------------------------------------------------------
*/
// UpdateByUUID updates a user identified by their UUID in :userData.UUID
func (user *User) UpdateByUUID(database *sql.DB, userData *User) {
if len(userData.UUID) == 0 {
panic(&ModelError{
Code: UserErrorUpdateMissingUUID,
Message: "a uuid has to be provided to update the user",
Data: userData,
})
} else if len(userData.Email) > 0 {
if err := utils.ValidateEmail(userData.Email); err != nil {
panic(&ModelError{
Code: err.(*ValidationError).Code,
Message: err.(*ValidationError).Message,
Data: map[string]interface{}{"email": userData.Email},
})
}
} else if len(userData.Username) > 0 {
if err := utils.ValidateUsername(userData.Username); err != nil {
panic(&ModelError{
Code: err.(*ValidationError).Code,
Message: err.(*ValidationError).Message,
Data: map[string]interface{}{"username": userData.Username},
})
}
}
user.updateByUUID(database, userData)
}
func (user *User) updateByUUID(database *sql.DB, userData *User) {
var setters []string
var params []interface{}
if len(userData.Email) > 0 {
setters = append(setters, "email=?")
params = append(params, userData.Email)
}
if len(userData.Username) > 0 {
setters = append(setters, "username=?")
params = append(params, userData.Username)
}
params = append(params, userData.UUID)
sqlStmt := fmt.Sprintf("UPDATE accounts SET %s WHERE uuid=?", strings.Join(setters, ","))
logger.Infof("[user] executing sql '%s'", sqlStmt)
stmt, err := database.Prepare(sqlStmt)
if err != nil {
panic(err)
}
results, err := stmt.Exec(params...)
if err != nil {
panic(err)
}
rowsAffected, err := results.RowsAffected()
if err != nil {
panic(err)
} else if rowsAffected == 0 {
user.GetByUUID(database, userData.UUID)
}
}
/*
-------------------------------------------------------------------------------
USER REMOVAL
#delete #remove #account #user
-------------------------------------------------------------------------------
*/
// DeleteByUUID removes the user identified by :uuid using the database
// connection :database
func (user *User) DeleteByUUID(database *sql.DB, uuid string) {
logger.Infof("[user] removing user with UUID '%v'", uuid)
if len(uuid) == 0 {
panic(&ModelError{
Code: UserErrorDeleteMissingUUID,
Message: "missing 'uuid' parameter",
})
}
user.deleteByUUID(database, uuid)
logger.Infof("[user] removed user with UUID '%v'", uuid)
}
// deleteByUUID defines the database operations for removing a user identified
// by :uuid
func (*User) deleteByUUID(database *sql.DB, uuid string) {
sqlStmt := "DELETE FROM accounts WHERE uuid = ?"
logger.Infof("[user] executing sql '%s'", sqlStmt)
stmt, err := database.Prepare(sqlStmt)
if err != nil {
panic(err)
}
results, err := stmt.Exec(uuid)
if err != nil {
panic(err)
}
rowsAffected, err := results.RowsAffected()
if err != nil {
panic(err)
} else if rowsAffected == 0 {
panic(&ModelError{
Code: UserErrorNotFound,
Message: fmt.Sprintf("user with uuid '%s' could not be found", uuid),
})
}
}