ch17.3

internal/data/models.go

@@ -11,9 +11,10 @@ var (
 )
 
 type Models struct {
-	Movies MovieModel
-	Users  UserModel
-	Tokens TokenModel
+	Movies      MovieModel
+	Users       UserModel
+	Tokens      TokenModel
+	Permissions PermissionModel
 }
 
 // type Models struct {
@@ -28,9 +29,10 @@ type Models struct {
 
 func NewModels(db *sql.DB) Models {
 	return Models{
-		Movies: MovieModel{DB: db},
-		Users:  UserModel{DB: db},
-		Tokens: TokenModel{DB: db},
+		Movies:      MovieModel{DB: db},
+		Users:       UserModel{DB: db},
+		Tokens:      TokenModel{DB: db},
+		Permissions: PermissionModel{DB: db},
 	}
 }
 

internal/data/permissions.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"time"
+)
+
+type Permissions []string
+
+func (p Permissions) Include(code string) bool {
+	for i := range p {
+		if code == p[i] {
+			return true
+		}
+	}
+	return false
+}
+
+type PermissionModel struct {
+	DB *sql.DB
+}
+
+func (m PermissionModel) GetAllForUser(userID int64) (Permissions, error) {
+	query := `
+		SELECT permissions.code
+		FROM permissions
+		INNER JOIN users_permissions ON users_permissions.permission_id = permissions.id
+		INNER JOIN users ON users_permissions.user_id = users.id
+		WHERE users.id = $1`
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	rows, err := m.DB.QueryContext(ctx, query, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var permissions Permissions
+
+	for rows.Next() {
+		var permission string
+
+		err := rows.Scan(&permission)
+		if err != nil {
+			return nil, err
+		}
+		permissions = append(permissions, permission)
+	}
+
+	if err = rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return permissions, nil
+}