validate

func Validate ¶

func Validate[T any](opts ...Option) middleware.MiddlewareFunc

Validate creates a middleware that validates the request body as the specified type T

The middleware performs the following processes: 1. If type T implements RequestUnmarshaler interface, it uses UnmarshalFromRequest method 2. Otherwise, it automatically detects if the request body is JSON or XML based on the first non-whitespace character:

• '{' or '[' for JSON (unmarshals using json.Unmarshal)
• '<' for XML (unmarshals using xml.Unmarshal)
• Other characters default to JSON

3. Performs validation of type T using validator/v10 (tags must be set) 4. Returns a 400 Bad Request error if validation fails 5. If validation succeeds, sets the value of type T in the context

The key to set in the context defaults to CtxKey{}, but can be changed with the WithCtxKey option The response in case of an error can be customized with the WithResponse option

Examples: ```

type User struct {
    Name  string `json:"name" validate:"required"`
    Email string `json:"email" validate:"required,email"`
    Age   int    `json:"age" validate:"gte=0,lte=130"`
}

// Validates the request body as User type and sets the validated User object in the context Validate[User]()

// Use a custom context key type UserKey string Validate[User](WithCtxKey(UserKey("user")))

// Set a custom error response Validate[User](WithResponse("application/json", `{"error": "Validation failed"}`)) ```