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39 lines
1 KiB
Go
39 lines
1 KiB
Go
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package server
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import (
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"net/http"
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"strings"
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)
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type Middleware func(Handler) Handler
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// wrapMiddleware creates a new handler by wrapping middleware around a final
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// handler. The middlewares' Handlers will be executed by requests in the order
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// they are provided.
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func wrapMiddleware(mw []Middleware, handler Handler) Handler {
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// Loop backwards through the middleware invoking each one. Replace the
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// handler with the new wrapped handler. Looping backwards ensures that the
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// first middleware of the slice is the first to be executed by requests.
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for i := len(mw) - 1; i >= 0; i-- {
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h := mw[i]
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if h != nil {
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handler = h(handler)
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}
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}
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return handler
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}
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// StripTrailingSlash is a middleware that will strip trailing slashes from the request path.
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//
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// Example: /api/v1/ -> /api/v1
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func StripTrailingSlash() Middleware {
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return func(h Handler) Handler {
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return HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
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r.URL.Path = strings.TrimSuffix(r.URL.Path, "/")
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return h.ServeHTTP(w, r)
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})
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}
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}
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