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package middleware
import "github.com/labstack/echo"
type (
// MethodOverrideConfig defines the config for MethodOverride middleware.
MethodOverrideConfig struct {
// Skipper defines a function to skip middleware.
Skipper Skipper
// Getter is a function that gets overridden method from the request.
// Optional. Default values MethodFromHeader(echo.HeaderXHTTPMethodOverride).
Getter MethodOverrideGetter
}
// MethodOverrideGetter is a function that gets overridden method from the request
MethodOverrideGetter func(echo.Context) string
)
var (
// DefaultMethodOverrideConfig is the default MethodOverride middleware config.
DefaultMethodOverrideConfig = MethodOverrideConfig{
Skipper: DefaultSkipper,
Getter: MethodFromHeader(echo.HeaderXHTTPMethodOverride),
}
)
// MethodOverride returns a MethodOverride middleware.
// MethodOverride middleware checks for the overridden method from the request and
// uses it instead of the original method.
//
// For security reasons, only `POST` method can be overridden.
func MethodOverride() echo.MiddlewareFunc {
return MethodOverrideWithConfig(DefaultMethodOverrideConfig)
}
// MethodOverrideWithConfig returns a MethodOverride middleware with config.
// See: `MethodOverride()`.
func MethodOverrideWithConfig(config MethodOverrideConfig) echo.MiddlewareFunc {
// Defaults
if config.Skipper == nil {
config.Skipper = DefaultMethodOverrideConfig.Skipper
}
if config.Getter == nil {
config.Getter = DefaultMethodOverrideConfig.Getter
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
if config.Skipper(c) {
return next(c)
}
req := c.Request()
if req.Method == echo.POST {
m := config.Getter(c)
if m != "" {
req.Method = m
}
}
return next(c)
}
}
}
// MethodFromHeader is a `MethodOverrideGetter` that gets overridden method from
// the request header.
func MethodFromHeader(header string) MethodOverrideGetter {
return func(c echo.Context) string {
return c.Request().Header.Get(header)
}
}
// MethodFromForm is a `MethodOverrideGetter` that gets overridden method from the
// form parameter.
func MethodFromForm(param string) MethodOverrideGetter {
return func(c echo.Context) string {
return c.FormValue(param)
}
}
// MethodFromQuery is a `MethodOverrideGetter` that gets overridden method from
// the query parameter.
func MethodFromQuery(param string) MethodOverrideGetter {
return func(c echo.Context) string {
return c.QueryParam(param)
}
}
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