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25 lines
823 B
Go
25 lines
823 B
Go
package web
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// Middleware is a function designed to run some code before and/or after
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// another Handler. It is designed to remove boilerplate or other concerns not
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// direct to any given Handler.
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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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