transmet/user/user.go

package user

import (
	"database/sql"
	"fmt"
	_ "github.com/lib/pq"
)

type User struct {
	Username string
	db       *sql.DB
}

func UsernameExists(db *sql.DB, username string) (bool, error) {
	rows, err := db.Query("SELECT count(username) FROM users where username=$1", username)
	if err != nil {
		fmt.Println("User DB Error: ", err)
		return false, err
	}
	defer rows.Close()
	var count int
	rows.Next()
	rows.Scan(&count)
	return count > 0, nil
}

func NewUserFromAuth(db *sql.DB, username, password string) *User {
	fmt.Println("NewUserFromAuth:", username)
	rows, err := db.Query("SELECT username FROM users WHERE username = $1 AND password IS NOT NULL AND password = crypt($2 , password);", username, password)
	if err != nil {
		fmt.Println("Username or auth fail: ", err)
		return nil
	}
	defer rows.Close()
	user := User{db: db}
	if rows.Next() {
		err := rows.Scan(&user.Username)
		if err != nil {
			fmt.Println("scan err: ", err)
		}
	} else {
		fmt.Println("no match")
		return nil
	}
	return &user
}

func NewUserFromUsername(db *sql.DB, username string) *User {
	rows, err := db.Query("SELECT username FROM users WHERE username=$1", username)
	if err != nil {
		fmt.Println("User DB Error: ", err)
		return nil
	}
	defer rows.Close()
	user := User{db: db}
	if rows.Next() {
		err = rows.Scan(&user.Username)
		if err != nil {
			fmt.Println("Scan err: ", err)
		}
	} else {
		fmt.Println("User DB Error: No user found with username ", username)
		return nil
	}
	return &user
}