/
router.go
143 lines (121 loc) · 3.41 KB
/
router.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package restful
import (
"context"
"errors"
"net/http"
"regexp"
"strings"
)
type paramsMap map[string]string
//http router
type Route struct {
Method string
Path *regexp.Regexp
Params []string
Handler http.HandlerFunc
}
type Router struct {
routes []*Route
}
func NewRouter() *Router {
return &Router{}
}
func (this *Router) Try(path string, method string) (http.HandlerFunc, paramsMap, error) {
for _, route := range this.routes {
if route.Method == method {
match := route.Path.MatchString(path)
if match == false {
continue
}
params := paramsMap{}
if len(route.Params) > 0 {
params = parseParams(route, path)
}
return route.Handler, params, nil
}
}
return nil, paramsMap{}, errors.New("Route not found")
}
func (this *Router) add(method string, path string, handler http.HandlerFunc) {
route := &Route{}
route.Method = method
path = "^" + path + "$"
route.Handler = handler
if strings.Contains(path, ":") {
matches := regexp.MustCompile(`:(\w+)`).FindAllStringSubmatch(path, -1)
if matches != nil {
for _, v := range matches {
route.Params = append(route.Params, v[1])
path = strings.Replace(path, v[0], `(\w+)`, 1)
}
}
}
compiledPath, err := regexp.Compile(path)
if err != nil {
panic(err)
}
route.Path = compiledPath
this.routes = append(this.routes, route)
}
func (r *Router) Head(path string, handler http.HandlerFunc) {
r.add("HEAD", path, handler)
}
func (r *Router) Connect(path string, handler http.HandlerFunc) {
r.add("CONNECT", path, handler)
}
func (r *Router) Get(path string, handler http.HandlerFunc) {
r.add("GET", path, handler)
}
func (r *Router) Post(path string, handler http.HandlerFunc) {
r.add("POST", path, handler)
}
func (r *Router) Put(path string, handler http.HandlerFunc) {
r.add("PUT", path, handler)
}
func (r *Router) Delete(path string, handler http.HandlerFunc) {
r.add("DELETE", path, handler)
}
func (r *Router) Options(path string, handler http.HandlerFunc) {
r.add("OPTIONS", path, handler)
}
func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
handler, params, err := r.Try(req.URL.Path, req.Method)
if err != nil {
http.NotFound(w, req)
return
}
ctx := context.WithValue(req.Context(), "params", params)
handler(w, req.WithContext(ctx))
}
func parseParams(route *Route, path string) paramsMap {
matches := route.Path.FindAllStringSubmatch(path, -1)
params := paramsMap{}
matchedParams := matches[0][1:]
for k, v := range matchedParams {
params[route.Params[k]] = v
}
return params
}
func getParam(r *http.Request, key string) string {
ctx := r.Context()
params := ctx.Value("params").(paramsMap)
val, _ := params[key]
return val
}