README.md

movie-database

A Rest-API for managing a website for showing their associated information. Actually, Everything is same as my Booking Management System except for GraphQL and bcrypt pkg for hashing passwords.

GraphQL in Golang

• First I implement my GraphQL schema definition.
• Second I define movieType.
• Third with moviesGraphQL function take the response to the user.

// GraphQL Schema Definition
var fields = graphql.Fields{
	"movie": &graphql.Field{
		Type:        movieType,
		Description: "Get movie by id",
		Args: graphql.FieldConfigArgument{
			"id": &graphql.ArgumentConfig{
				Type: graphql.Int,
			},
		},
		Resolve: func(p graphql.ResolveParams) (interface{}, error) {
			id, ok := p.Args["id"].(int)
			if ok {
				for _, movie := range movies {
					if movie.ID == id {
						return movie, nil
					}
				}
			}
			return nil, nil
		},
	},
	"list": &graphql.Field{
		Type:        graphql.NewList(movieType),
		Description: "Get all movies",
		Resolve: func(params graphql.ResolveParams) (interface{}, error) {
			return movies, nil
		},
	},
	"search": &graphql.Field{
		Type:        graphql.NewList(movieType),
		Description: "Search movies by title",
		Args: graphql.FieldConfigArgument{
			"titleContains": &graphql.ArgumentConfig{
				Type: graphql.String,
			},
		},
		Resolve: func(params graphql.ResolveParams) (interface{}, error) {
			var theList []*models.Movie
			search, ok := params.Args["titleContains"].(string)
			if ok {
				for _, currentMovie := range movies {
					if strings.Contains(currentMovie.Title, search) {
						log.Println("Found one")
						theList = append(theList, currentMovie)
					}
				}
			}
			return theList, nil
		},
	},
}

// GraphQL object definition
var movieType = graphql.NewObject(
	graphql.ObjectConfig{
		Name: "Movie",
		Fields: graphql.Fields{
			"id": &graphql.Field{
				Type: graphql.Int,
			},
			"title": &graphql.Field{
				Type: graphql.String,
			},
			"description": &graphql.Field{
				Type: graphql.String,
			},
			"year": &graphql.Field{
				Type: graphql.Int,
			},
			"release_date": &graphql.Field{
				Type: graphql.DateTime,
			},
			"runtime": &graphql.Field{
				Type: graphql.Int,
			},
			"rating": &graphql.Field{
				Type: graphql.Int,
			},
			"mpaa_rating": &graphql.Field{
				Type: graphql.String,
			},
			"created_at": &graphql.Field{
				Type: graphql.DateTime,
			},
			"updated_at": &graphql.Field{
				Type: graphql.DateTime,
			},
		},
	},
)

func (app *Application) moviesGraphQL(w http.ResponseWriter, r *http.Request) {
	movies, _ = app.models.DB.GetAll()

	q, err := io.ReadAll(r.Body)
	if err != nil {
		zerolog.Error().Msg(err.Error())
		w.Write([]byte(err.Error()))
		return
	}
	query := string(q)

	log.Println(query)

	rootQuery := graphql.ObjectConfig{Name: "RootQuery", Fields: fields}
	schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(rootQuery)}
	schema, err := graphql.NewSchema(schemaConfig)
	if err != nil {
		http.Error(w, "Failed to create graphql schema", http.StatusInternalServerError)
		zerolog.Error().Msg(err.Error())
		log.Println(err)
		return
	}

	params := graphql.Params{Schema: schema, RequestString: query}
	resp := graphql.Do(params)
	if len(resp.Errors) > 0 {
		http.Error(w, fmt.Sprintf("failed: %+v", resp.Errors), http.StatusInternalServerError)
		zerolog.Error().Msg(fmt.Sprintf("failed: %+v", resp.Errors))
		return
	}

	j, _ := json.MarshalIndent(resp, "", "  ")
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	w.Write(j)

	return
}

---

Hashing Passwords

Use bcrypt golang.org/x/crypto/bcrypt pkg for hashing passwords alternatively you can use scrypt pkg for using more strong golang.org/x/crypto/scrypt hashing algorithms.

• First I use createHashPassword for hashing passwords.
• Second I use this function for comparing hash and password compareHashAndPass.
• Third we have minCost, DefaultCost, MaxCost for specify the cost for hashing use them for your purposes.

func createHashPassword(pass string) (string, error) {
	hashPass, err := bcrypt.GenerateFromPassword([]byte(pass), 12)
	if err != nil {
		return "", err
	}

	return string(hashPass), err
}

func compareHashAndPass(hashPass string, pass string) error {
	err := bcrypt.CompareHashAndPassword([]byte(hashPass), []byte(pass))
	if err != nil {
		return bcrypt.ErrMismatchedHashAndPassword
	}

	return nil
}