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package main
import (
"net/http"
"crypto/rand"
"encoding/base64"
"database/sql"
"strings"
"errors"
"github.com/gin-gonic/gin"
_ "github.com/mattn/go-sqlite3"
"golang.org/x/crypto/bcrypt"
"water/api/lib"
)
func CORSMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT")
if c.Request.Method == "OPTIONS" {
c.AbortWithStatus(204)
return
}
c.Next()
}
}
// generatToken will g
func generateToken() string {
token := make([]byte, 32)
rand.Read(token)
return base64.StdEncoding.EncodeToString(token)
}
func establishDBConnection() *sql.DB {
db, err := sql.Open("sqlite3", "../db/water.sqlite3")
if err != nil {
panic(err)
}
return db
}
func checkForTokenInContext(c *gin.Context) (string, error) {
authorizationHeader := c.GetHeader("Authorization")
if authorizationHeader == "" {
return "", errors.New("Authorization header is missing")
}
parts := strings.Split(authorizationHeader, " ")
if len(parts) != 2 || parts[0] != "Bearer" {
return "", errors.New("Invalid Authorization header format")
}
return parts[1], nil
}
func TokenRequired() gin.HandlerFunc {
return func(c *gin.Context) {
_, err := checkForTokenInContext(c)
if err != nil {
c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
c.Abort()
return
}
c.Next()
}
}
func setupRouter() *gin.Engine {
// Disable Console Color
// gin.DisableConsoleColor()
r := gin.Default()
r.Use(CORSMiddleware())
r.Use(gin.Logger())
r.Use(gin.Recovery())
api := r.Group("api/v1")
api.POST("/auth", func(c *gin.Context) {
username, password, ok := c.Request.BasicAuth()
if !ok {
c.Header("WWW-Authenticate", `Basic realm="Please enter your username and password."`)
c.AbortWithStatus(http.StatusUnauthorized)
return
}
db := establishDBConnection()
defer db.Close()
var user models.User
var preference models.Preference
var size models.Size
row := db.QueryRow("SELECT name, uuid, password, color, size, unit FROM Users u INNER JOIN Preferences p ON p.user_id = u.id INNER JOIN Sizes s ON p.size_id = s.id WHERE u.name = ?", username)
if err := row.Scan(&user.Name, &user.UUID, &user.Password, &preference.Color, &size.Size, &size.Unit); err != nil {
if err == sql.ErrNoRows {
c.AbortWithStatus(http.StatusUnauthorized)
return
}
}
if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password)); err != nil {
c.AbortWithStatus(http.StatusUnauthorized)
return
}
preference.Size = size
// Generate a simple API token
apiToken := generateToken()
c.JSON(http.StatusOK, gin.H{"token": apiToken, "user": user, "preferences": preference})
})
stats := api.Group("stats")
stats.Use(TokenRequired())
{
stats.GET("/", func(c *gin.Context) {
db := establishDBConnection()
defer db.Close()
rows, err := db.Query("SELECT s.date, s.quantity, u.uuid, u.name FROM Statistics s INNER JOIN Users u ON u.id = s.user_id");
if err != nil {
c.JSON(500, gin.H{"error": err.Error()})
return
}
defer rows.Close()
var data []models.Statistic
for rows.Next() {
var stat models.Statistic
var user models.User
if err := rows.Scan(&stat.Date, &stat.Quantity, &user.UUID, &user.Name); err != nil {
c.JSON(500, gin.H{"error": err.Error()})
return
}
stat.User = user
data = append(data, stat)
}
c.JSON(http.StatusOK, data)
})
stats.POST("/", func(c *gin.Context) {
var stat models.Statistic
if err := c.BindJSON(&stat); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
db := establishDBConnection()
defer db.Close()
result, err := db.Exec("INSERT INTO statistics (date, user_id, quantity) values (?, ?, ?)", stat.Date, 1, stat.Quantity)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
}
id, err := result.LastInsertId()
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
}
c.JSON(http.StatusCreated, gin.H{"status": "created", "id": id})
})
stats.GET("/:uuid", func(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{"status": "ok", "uuid": c.Param("uuid")})
})
stats.PATCH("/:uuid", func(c *gin.Context) {
c.JSON(http.StatusNoContent, gin.H{"status": "No Content"})
})
stats.DELETE("/:uuid", func(c *gin.Context) {
c.JSON(http.StatusNoContent, gin.H{"status": "No Content"})
})
}
return r
}
func main() {
r := setupRouter()
// Listen and Server in 0.0.0.0:8080
r.Run(":8080")
}
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