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routegroup.go
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routegroup.go
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/*
Copyright (c) JSC iCore.
This source code is licensed under the MIT license found in the
LICENSE file in the root directory of this source tree.
*/
// Package routegroup provides a modular approach to organizing HTTP handlers
// and encapsulates an HTTP router's implementation.
package routegroup // import "github.com/i-core/routegroup"
import (
"context"
"net/http"
"github.com/julienschmidt/httprouter"
"github.com/justinas/alice"
)
type pathParamsContextKeyType struct{}
var pathParamsContextKey = pathParamsContextKeyType{}
// RouteAdder is an interface that is used for registering routes.
type RouteAdder interface {
AddRoutes(apply func(m, p string, h http.Handler, mws ...func(http.Handler) http.Handler))
}
// Router is a HTTP router that serves HTTP handlers.
type Router struct {
http.Handler
impl *httprouter.Router
}
// NewRouter creates a new Router.
func NewRouter(mws ...func(http.Handler) http.Handler) *Router {
var ctrs []alice.Constructor
for _, mw := range mws {
ctrs = append(ctrs, mw)
}
impl := httprouter.New()
return &Router{Handler: alice.New(ctrs...).Then(impl), impl: impl}
}
// AddRoutes adds RouteAdder's routes with an optional prefix.
func (rt *Router) AddRoutes(adder RouteAdder, prefix string) {
adder.AddRoutes(func(m, p string, h http.Handler, mws ...func(http.Handler) http.Handler) {
var ctrs []alice.Constructor
for _, mw := range mws {
ctrs = append(ctrs, mw)
}
rt.handler(m, prefix+p, alice.New(ctrs...).Then(h))
})
}
func (rt *Router) handler(method, path string, handler http.Handler) {
rt.impl.Handle(method, path,
func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
v := make(map[string]string)
for _, p := range ps {
v[p.Key] = p.Value
}
ctx := context.WithValue(r.Context(), pathParamsContextKey, v)
r = r.WithContext(ctx)
handler.ServeHTTP(w, r)
},
)
}
// PathParam returns an URL path's parameter by a name.
func PathParam(ctx context.Context, key string) string {
ps, ok := ctx.Value(pathParamsContextKey).(map[string]string)
if !ok {
return ""
}
return ps[key]
}