45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
package middleware
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import "net/http"
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type (
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// Interceptor intercepts an HTTP handler invocation, it is passed both
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// response writer and request which after interception can be passed
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// onto the handler function.
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Interceptor func(w http.ResponseWriter, r *http.Request, next http.HandlerFunc)
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// HandlerFunc builds on top of http.HandlerFunc, and exposes API to
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// intercept with Interceptor. This allows building complex long chains
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// without complicated struct manipulation.
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HandlerFunc http.HandlerFunc
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// Chain is a collection of interceptors that will be invoked in there
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// index order.
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Chain []Interceptor
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// Skipper is a requests checker for middleware configurations. true
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// return force middleware to skip any actions with current request.
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Skipper func(r *http.Request) bool
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)
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var DefaultSkipper Skipper = func(_ *http.Request) bool { return false }
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// Intercept returns back a continuation that will call install middleware to
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// intercept the continuation call.
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func (hf HandlerFunc) Intercept(i Interceptor) HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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i(w, r, http.HandlerFunc(hf))
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}
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}
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// Handler allows hooking multiple middleware in single call.
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func (c Chain) Handler(hf http.HandlerFunc) http.Handler {
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current := HandlerFunc(hf)
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for i := len(c) - 1; i >= 0; i-- {
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current = current.Intercept(c[i])
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}
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return http.HandlerFunc(current)
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}
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