drahoot/cmd/serverFunc.go

package cmd

import (
	"crypto/sha256"
	"database/sql"
	"encoding/hex"
	"fmt"
	"log"
	"net/http"

	"github.com/gin-gonic/gin"
	_ "github.com/lib/pq"
	"github.com/spf13/viper"
)

var (
	ListenPort = "8080"

	db *sql.DB

	DB_Host string
	DB_Port string
	DB_User string
	DB_Pass string
	DB_Name string
)

func server() {
	log.SetPrefix("[DRAHOOT] ")
	setPort()
	if err := getDBInfo(); err != nil {
		log.Fatalf("INVALID DB INFO: %v\nPlease refer to the example configuration file in the repo at https://git.bulgariu.xyz/raul/drahoot/src/branch/main/sample-config (default config path = ~/.config/drahoot/drahoot.toml)", err)
	}
	if err := openDB(); err != nil {
		log.Fatalf("Error happened trying to connect to database: %v", err)
	}

	gin.SetMode(gin.ReleaseMode)
	r := gin.Default()
	r.GET("/api/ping", ping)

	// CRUD for users
	r.GET("/api/user", getUsers)
	r.GET("/api/user/:userid", getUser)
	r.POST("/api/user", createUser)
	r.DELETE("/api/user/:userid", deleteUser)
	r.PUT("/api/user/:userid", modifyUser)

	// TODO: Finish the following:
	// CRUD for quizzes
	// CRUD for quiz questions
	// CRUD for question answers
	// CRUD for quiz attempts

	r.Run(":" + ListenPort)
}

func setResponse(content any, success bool) response {
	msg := response{Contents: content, Success: success}
	return msg
}

func ping(c *gin.Context) {
	c.IndentedJSON(http.StatusOK, setResponse("Pong!", true))
}

func hashPW(plain string) string {
	hashedPW := sha256.New()
	hashedPW.Write([]byte(plain))
	sha256hash := hex.EncodeToString(hashedPW.Sum(nil))
	return sha256hash
}

func getDBInfo() error {
	dbhost := viper.GetString("Server.DB_Host")
	if dbhost == "" {
		e := fmt.Errorf("No database IP address present in config file!\n")
		return e
	} else {
		DB_Host = dbhost
	}

	dbport := viper.GetString("Server.DB_Port")
	if dbport == "" {
		e := fmt.Errorf("No database port present in config file!\n")
		return e
	} else {
		DB_Port = dbport
	}

	dbuser := viper.GetString("Server.DB_User")
	if dbuser == "" {
		e := fmt.Errorf("No database username present in config file!\n")
		return e
	} else {
		DB_User = dbuser
	}

	dbpass := viper.GetString("Server.DB_Pass")
	if dbpass == "" {
		e := fmt.Errorf("No database password present in config file!\n")
		return e
	} else {
		DB_Pass = dbpass
	}

	dbname := viper.GetString("Server.DB_Name")
	if dbname == "" {
		e := fmt.Errorf("No database name present in config file!\n")
		return e
	} else {
		DB_Name = dbname
	}
	return nil
}

func openDB() error {
	psqlconn := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable", DB_Host, DB_Port, DB_User, DB_Pass, DB_Name)
	dba, err := sql.Open("postgres", psqlconn)
	if err != nil {
		return err
	}
	db = dba
	return nil
}

func setPort() {
	p := viper.GetString("Server.Port")
	if p != "" {
		ListenPort = p
	}
}