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|
package middleware
import (
"github.com/labstack/echo"
)
type (
// TrailingSlashConfig defines the config for TrailingSlash middleware.
TrailingSlashConfig struct {
// Skipper defines a function to skip middleware.
Skipper Skipper
// Status code to be used when redirecting the request.
// Optional, but when provided the request is redirected using this code.
RedirectCode int `yaml:"redirect_code"`
}
)
var (
// DefaultTrailingSlashConfig is the default TrailingSlash middleware config.
DefaultTrailingSlashConfig = TrailingSlashConfig{
Skipper: DefaultSkipper,
}
)
// AddTrailingSlash returns a root level (before router) middleware which adds a
// trailing slash to the request `URL#Path`.
//
// Usage `Echo#Pre(AddTrailingSlash())`
func AddTrailingSlash() echo.MiddlewareFunc {
return AddTrailingSlashWithConfig(DefaultTrailingSlashConfig)
}
// AddTrailingSlashWithConfig returns a AddTrailingSlash middleware with config.
// See `AddTrailingSlash()`.
func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
// Defaults
if config.Skipper == nil {
config.Skipper = DefaultTrailingSlashConfig.Skipper
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
if config.Skipper(c) {
return next(c)
}
req := c.Request()
url := req.URL
path := url.Path
qs := c.QueryString()
if path != "/" && path[len(path)-1] != '/' {
path += "/"
uri := path
if qs != "" {
uri += "?" + qs
}
// Redirect
if config.RedirectCode != 0 {
return c.Redirect(config.RedirectCode, uri)
}
// Forward
req.RequestURI = uri
url.Path = path
}
return next(c)
}
}
}
// RemoveTrailingSlash returns a root level (before router) middleware which removes
// a trailing slash from the request URI.
//
// Usage `Echo#Pre(RemoveTrailingSlash())`
func RemoveTrailingSlash() echo.MiddlewareFunc {
return RemoveTrailingSlashWithConfig(TrailingSlashConfig{})
}
// RemoveTrailingSlashWithConfig returns a RemoveTrailingSlash middleware with config.
// See `RemoveTrailingSlash()`.
func RemoveTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
// Defaults
if config.Skipper == nil {
config.Skipper = DefaultTrailingSlashConfig.Skipper
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
if config.Skipper(c) {
return next(c)
}
req := c.Request()
url := req.URL
path := url.Path
qs := c.QueryString()
l := len(path) - 1
if l >= 0 && path != "/" && path[l] == '/' {
path = path[:l]
uri := path
if qs != "" {
uri += "?" + qs
}
// Redirect
if config.RedirectCode != 0 {
return c.Redirect(config.RedirectCode, uri)
}
// Forward
req.RequestURI = uri
url.Path = path
}
return next(c)
}
}
}
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