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73 lines
1.7 KiB
73 lines
1.7 KiB
package middleware
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import (
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"context"
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"net/http"
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"strings"
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"github.com/go-chi/chi"
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)
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var (
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// URLFormatCtxKey is the context.Context key to store the URL format data
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// for a request.
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URLFormatCtxKey = &contextKey{"URLFormat"}
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)
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// URLFormat is a middleware that parses the url extension from a request path and stores it
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// on the context as a string under the key `middleware.URLFormatCtxKey`. The middleware will
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// trim the suffix from the routing path and continue routing.
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//
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// Routers should not include a url parameter for the suffix when using this middleware.
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//
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// Sample usage.. for url paths: `/articles/1`, `/articles/1.json` and `/articles/1.xml`
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//
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// func routes() http.Handler {
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// r := chi.NewRouter()
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// r.Use(middleware.URLFormat)
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//
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// r.Get("/articles/{id}", ListArticles)
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//
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// return r
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// }
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//
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// func ListArticles(w http.ResponseWriter, r *http.Request) {
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// urlFormat, _ := r.Context().Value(middleware.URLFormatCtxKey).(string)
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//
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// switch urlFormat {
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// case "json":
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// render.JSON(w, r, articles)
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// case "xml:"
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// render.XML(w, r, articles)
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// default:
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// render.JSON(w, r, articles)
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// }
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// }
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//
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func URLFormat(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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var format string
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path := r.URL.Path
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if strings.Index(path, ".") > 0 {
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base := strings.LastIndex(path, "/")
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idx := strings.LastIndex(path[base:], ".")
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if idx > 0 {
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idx += base
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format = path[idx+1:]
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rctx := chi.RouteContext(r.Context())
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rctx.RoutePath = path[:idx]
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}
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}
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r = r.WithContext(context.WithValue(ctx, URLFormatCtxKey, format))
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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