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package app
import (
"net/http"
"net/url"
"strings"
)
func applyMiddleware(h http.Handler, middleware ...func(http.Handler) http.Handler) http.Handler {
// Needs to be wrapped in reverse order
// so that the first one listed, is the "outermost"
// handler, thus preserving the expected run-order.
for i := len(middleware) - 1; i >= 0; i-- {
h = middleware[i](h)
}
return h
}
func httpRedirect(prefix, from, to string) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.URL.Path != from {
next.ServeHTTP(w, req)
return
}
http.Redirect(w, req, prefix+to, http.StatusTemporaryRedirect)
})
}
}
func httpRewriteWith(prefix, from string, fn func(req *http.Request) *http.Request) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.URL.Path == from || (strings.HasSuffix(from, "/") && strings.HasPrefix(req.URL.Path, from)) {
req = fn(req)
req.URL.Path = prefix + req.URL.Path
}
next.ServeHTTP(w, req)
})
}
}
func httpRewrite(prefix, from, to string) func(http.Handler) http.Handler {
u, err := url.Parse(to)
if err != nil {
panic(err)
}
uQ := u.Query()
return httpRewriteWith(prefix, from, func(req *http.Request) *http.Request {
origPath := req.URL.Path
req.URL.Path = u.Path
if strings.HasSuffix(from, "/") {
req.URL.Path += strings.TrimPrefix(origPath, from)
}
q := req.URL.Query()
for key := range uQ {
q.Set(key, uQ.Get(key))
}
req.URL.RawQuery = q.Encode()
return req
})
}
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