62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
package hws
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import (
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"errors"
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"net/http"
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)
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type Middleware func(h http.Handler) http.Handler
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type MiddlewareFunc func(w http.ResponseWriter, r *http.Request) (*http.Request, *HWSError)
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// Server.AddMiddleware registers all the middleware.
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// Middleware will be run in the order that they are provided.
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// Can only be called once
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func (server *Server) AddMiddleware(middleware ...Middleware) error {
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if !server.routes {
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return errors.New("Server.AddRoutes must be called before Server.AddMiddleware")
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}
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if server.middleware {
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return errors.New("Server.AddMiddleware already called")
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}
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// RUN LOGGING MIDDLEWARE FIRST
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server.server.Handler = logging(server.server.Handler, server.logger)
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// LOOP PROVIDED MIDDLEWARE IN REVERSE order
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for i := len(middleware); i > 0; i-- {
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server.server.Handler = middleware[i-1](server.server.Handler)
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}
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// RUN GZIP
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if server.GZIP {
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server.server.Handler = addgzip(server.server.Handler)
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}
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// RUN TIMER MIDDLEWARE LAST
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server.server.Handler = startTimer(server.server.Handler)
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server.middleware = true
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return nil
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}
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// NewMiddleware returns a new Middleware for the server.
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// A MiddlewareFunc is a function that takes in a http.ResponseWriter and http.Request,
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// and returns a new request and optional HWSError.
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// If a HWSError is returned, server.ThrowError will be called.
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// If HWSError.RenderErrorPage is true, the request chain will be terminated and the error page rendered
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func (server *Server) NewMiddleware(
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middlewareFunc MiddlewareFunc,
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) Middleware {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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newReq, herr := middlewareFunc(w, r)
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if herr != nil {
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server.ThrowError(w, r, *herr)
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if herr.RenderErrorPage {
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return
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}
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}
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next.ServeHTTP(w, newReq)
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})
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}
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}
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