131 lines
3.2 KiB
Go
131 lines
3.2 KiB
Go
package middleware
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import (
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"strings"
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"github.com/labstack/echo/v4"
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)
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type (
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// TrailingSlashConfig defines the config for TrailingSlash middleware.
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TrailingSlashConfig struct {
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// Skipper defines a function to skip middleware.
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Skipper Skipper
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// Status code to be used when redirecting the request.
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// Optional, but when provided the request is redirected using this code.
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RedirectCode int `yaml:"redirect_code"`
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}
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)
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var (
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// DefaultTrailingSlashConfig is the default TrailingSlash middleware config.
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DefaultTrailingSlashConfig = TrailingSlashConfig{
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Skipper: DefaultSkipper,
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}
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)
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// AddTrailingSlash returns a root level (before router) middleware which adds a
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// trailing slash to the request `URL#Path`.
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//
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// Usage `Echo#Pre(AddTrailingSlash())`
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func AddTrailingSlash() echo.MiddlewareFunc {
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return AddTrailingSlashWithConfig(DefaultTrailingSlashConfig)
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}
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// AddTrailingSlashWithConfig returns a AddTrailingSlash middleware with config.
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// See `AddTrailingSlash()`.
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func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
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// Defaults
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if config.Skipper == nil {
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config.Skipper = DefaultTrailingSlashConfig.Skipper
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}
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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if config.Skipper(c) {
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return next(c)
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}
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req := c.Request()
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url := req.URL
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path := url.Path
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qs := c.QueryString()
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if !strings.HasSuffix(path, "/") {
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path += "/"
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uri := path
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if qs != "" {
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uri += "?" + qs
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}
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// Redirect
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if config.RedirectCode != 0 {
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return c.Redirect(config.RedirectCode, sanitizeURI(uri))
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}
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// Forward
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req.RequestURI = uri
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url.Path = path
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}
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return next(c)
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}
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}
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}
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// RemoveTrailingSlash returns a root level (before router) middleware which removes
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// a trailing slash from the request URI.
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//
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// Usage `Echo#Pre(RemoveTrailingSlash())`
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func RemoveTrailingSlash() echo.MiddlewareFunc {
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return RemoveTrailingSlashWithConfig(TrailingSlashConfig{})
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}
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// RemoveTrailingSlashWithConfig returns a RemoveTrailingSlash middleware with config.
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// See `RemoveTrailingSlash()`.
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func RemoveTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc {
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// Defaults
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if config.Skipper == nil {
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config.Skipper = DefaultTrailingSlashConfig.Skipper
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}
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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if config.Skipper(c) {
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return next(c)
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}
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req := c.Request()
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url := req.URL
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path := url.Path
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qs := c.QueryString()
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l := len(path) - 1
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if l > 0 && strings.HasSuffix(path, "/") {
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path = path[:l]
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uri := path
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if qs != "" {
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uri += "?" + qs
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}
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// Redirect
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if config.RedirectCode != 0 {
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return c.Redirect(config.RedirectCode, sanitizeURI(uri))
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}
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// Forward
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req.RequestURI = uri
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url.Path = path
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}
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return next(c)
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}
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}
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}
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func sanitizeURI(uri string) string {
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// double slash `\\`, `//` or even `\/` is absolute uri for browsers and by redirecting request to that uri
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// we are vulnerable to open redirect attack. so replace all slashes from the beginning with single slash
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if len(uri) > 1 && (uri[0] == '\\' || uri[0] == '/') && (uri[1] == '\\' || uri[1] == '/') {
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uri = "/" + strings.TrimLeft(uri, `/\`)
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}
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return uri
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}
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