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router_sub.go
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router_sub.go
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// Copyright (c) 2018 Palantir Technologies. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package wrouter
import (
"bytes"
"fmt"
"net/http"
"strings"
)
type subrouter struct {
rPath string
rParent Router
}
func (s *subrouter) Register(method, path string, handler http.Handler, params ...RouteParam) error {
rootRouter, basePath := s.getRootRouterAndPath()
return rootRouter.Register(method, fmt.Sprint(basePath, path), handler, params...)
}
func (s *subrouter) RegisteredRoutes() []RouteSpec {
rootRouter, basePath := s.getRootRouterAndPath()
var specs []RouteSpec
for _, spec := range rootRouter.RegisteredRoutes() {
if !strings.HasPrefix(spec.PathTemplate, basePath) {
continue
}
specs = append(specs, spec)
}
return specs
}
func (s *subrouter) Get(path string, handler http.Handler, params ...RouteParam) error {
return s.Register(http.MethodGet, path, handler, params...)
}
func (s *subrouter) Head(path string, handler http.Handler, params ...RouteParam) error {
return s.Register(http.MethodHead, path, handler, params...)
}
func (s *subrouter) Post(path string, handler http.Handler, params ...RouteParam) error {
return s.Register(http.MethodPost, path, handler, params...)
}
func (s *subrouter) Put(path string, handler http.Handler, params ...RouteParam) error {
return s.Register(http.MethodPut, path, handler, params...)
}
func (s *subrouter) Patch(path string, handler http.Handler, params ...RouteParam) error {
return s.Register(http.MethodPatch, path, handler, params...)
}
func (s *subrouter) Delete(path string, handler http.Handler, params ...RouteParam) error {
return s.Register(http.MethodDelete, path, handler, params...)
}
func (s *subrouter) Subrouter(path string) Router {
return &subrouter{
rPath: path,
rParent: s,
}
}
func (s *subrouter) Path() string {
return s.rPath
}
func (s *subrouter) Parent() Router {
return s.rParent
}
func (s *subrouter) RootRouter() RootRouter {
return s.rParent.RootRouter()
}
func (s *subrouter) getRootRouterAndPath() (Router, string) {
var currRouteSegment Router = s
var parts []string
for currRouteSegment.Parent() != nil {
parts = append(parts, currRouteSegment.Path())
currRouteSegment = currRouteSegment.Parent()
}
// parts contain all parent path parts in reverse order: join backwards to get path
pathBuf := &bytes.Buffer{}
for i := len(parts) - 1; i >= 0; i-- {
fmt.Fprint(pathBuf, parts[i])
}
// currRouteSegment is the root router
return currRouteSegment, pathBuf.String()
}