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package main
import (
"database/sql"
"fmt"
"log"
_ "github.com/lib/pq"
)
// setup the Database
func setupDatabase() (*sql.DB, error) {
connStr := "host=postgresql port=5432 user=postgres dbname=postgres sslmode=disable"
// open a connection to the database
db, err := sql.Open("postgres", connStr)
if err != nil {
log.Fatal(err)
}
// ping the database
err = db.Ping()
if err != nil {
return nil, err
}
// create a challenges table if it does not exist yet
err = dbCreateTableIfNotExist(db)
if err != nil {
log.Println(err)
}
return db, nil
}
// getNames gets the name of all the challenges
func dbGetName(db *sql.DB) string {
// get the current name of the challenges
query := fmt.Sprintf("SELECT name FROM challenges")
var names string
err := db.QueryRow(query).Scan(&names)
if err != nil {
log.Fatalf("[ E ] :", err)
}
return names
}
// getAllChallenges gets all the challenges from the server
func dbGetAllChallenges() []Challenge {
// build the query
query := fmt.Sprintf("SELECT * FROM challenges")
// Execute the query
rows, err := db.Query(query)
defer rows.Close()
if err != nil {
log.Printf("[ E ] getAllChallenges query: %v\n\t\t\t query: %s\n", err, query)
return []Challenge{}
}
var challenges []Challenge
// iterate over the returned rows
for rows.Next() {
var uuid, name, description, flag, container, category string
var points int
var static bool
scanErr := rows.Scan(&uuid, &name, &description, &flag, &container, &category, &points, &static)
if scanErr != nil {
log.Printf("[ E ] scan error: %v", scanErr)
return []Challenge{}
}
newChallenge := Challenge{
UUID: uuid,
Name: name,
Description: description,
Flag: flag,
Container: container,
Category: category,
Points: points,
Static: static,
}
challenges = append(challenges, newChallenge)
}
return challenges
}
// dbNewChallenge inserts the given challenge into the database
func dbNewChallenge(challenge Challenge) (string, error) {
// build the query to be executed
query := fmt.Sprintf("INSERT INTO challenges(name, description, flag, container, category, points, static) VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING uuid")
// execute the query with the challenge values given
var uuid string
err := db.QueryRow(query, challenge.Name, challenge.Description, challenge.Flag, challenge.Container, challenge.Category, challenge.Points, challenge.Static).Scan(&uuid)
// handle errors
if err != nil {
return "", err
}
return uuid, nil
}
// editChallengeUUID edited the challenge with the given uuid using the values in the updatedChallenge
func dbEditChallengeUUID(uuid string, updatedChallenge Challenge) error {
query := fmt.Sprintf("UPDATE challenges SET name = '$1', description = '$2', flag = '$3', container = '$4', category = '$5', points = $6, static = $7 WHERE uuid::text = '$8'")
err := db.QueryRow(query, updatedChallenge.Name, updatedChallenge.Description, updatedChallenge.Flag, updatedChallenge.Container, updatedChallenge.Category, updatedChallenge.Points, updatedChallenge.Static, updatedChallenge.UUID)
if err != nil {
return fmt.Errorf("could not edit the challenge: %s", err)
}
return nil
}
// dbGetChallengeByUUID returns the challenge with the given UUID from the database
func dbGetChallengeByUUID(uuid string) (Challenge, error) {
// build the query to be executed
query := fmt.Sprintf("SELECT uuid, name, description, flag, container, category, points, static FROM challenges WHERE uuid::text= '$1'")
challenge := Challenge{}
// execute the query storing the values in the challenge struct defined above
err := db.QueryRow(query, uuid).Scan(&challenge.UUID, &challenge.Name, &challenge.Description, &challenge.Flag, &challenge.Container, &challenge.Category, &challenge.Points, &challenge.Static)
if err != nil {
return Challenge{}, err
}
return challenge, nil
}
func dbDeleteChallengeByUUID(uuid string) error {
query := fmt.Sprintf("DELETE FROM challenges WHERE uuid::text = '%s'")
err := db.QueryRow(query, uuid)
if err != nil {
return fmt.Errorf("could not delete the challenge: %s", err)
}
return nil
}
func dbCreateTableIfNotExist(db *sql.DB) error {
log.Println("Creating a table in case it doesn't exist")
query := `CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
CREATE TABLE public.challenges
(
uuid uuid NOT NULL DEFAULT uuid_generate_v4(),
name character varying COLLATE pg_catalog."default" NOT NULL,
description character varying COLLATE pg_catalog."default",
flag character varying COLLATE pg_catalog."default",
container character varying COLLATE pg_catalog."default",
category character varying COLLATE pg_catalog."default",
points integer,
static boolean NOT NULL,
CONSTRAINT challenges_pkey PRIMARY KEY (uuid)
)`
_, err := db.Exec(query)
if err != nil {
return err
}
return nil
}
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