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- package middleware
-
- import (
- "context"
- "net/http"
- "strings"
-
- "github.com/go-chi/chi/v5"
- )
-
- var (
- // URLFormatCtxKey is the context.Context key to store the URL format data
- // for a request.
- URLFormatCtxKey = &contextKey{"URLFormat"}
- )
-
- // URLFormat is a middleware that parses the url extension from a request path and stores it
- // on the context as a string under the key `middleware.URLFormatCtxKey`. The middleware will
- // trim the suffix from the routing path and continue routing.
- //
- // Routers should not include a url parameter for the suffix when using this middleware.
- //
- // Sample usage.. for url paths: `/articles/1`, `/articles/1.json` and `/articles/1.xml`
- //
- // func routes() http.Handler {
- // r := chi.NewRouter()
- // r.Use(middleware.URLFormat)
- //
- // r.Get("/articles/{id}", ListArticles)
- //
- // return r
- // }
- //
- // func ListArticles(w http.ResponseWriter, r *http.Request) {
- // urlFormat, _ := r.Context().Value(middleware.URLFormatCtxKey).(string)
- //
- // switch urlFormat {
- // case "json":
- // render.JSON(w, r, articles)
- // case "xml:"
- // render.XML(w, r, articles)
- // default:
- // render.JSON(w, r, articles)
- // }
- // }
- //
- func URLFormat(next http.Handler) http.Handler {
- fn := func(w http.ResponseWriter, r *http.Request) {
- ctx := r.Context()
-
- var format string
- path := r.URL.Path
-
- if strings.Index(path, ".") > 0 {
- base := strings.LastIndex(path, "/")
- idx := strings.LastIndex(path[base:], ".")
-
- if idx > 0 {
- idx += base
- format = path[idx+1:]
-
- rctx := chi.RouteContext(r.Context())
- rctx.RoutePath = path[:idx]
- }
- }
-
- r = r.WithContext(context.WithValue(ctx, URLFormatCtxKey, format))
-
- next.ServeHTTP(w, r)
- }
- return http.HandlerFunc(fn)
- }
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