101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
package route
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import (
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"net/http"
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"github.com/julienschmidt/httprouter"
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"golang.org/x/net/context"
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)
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type param string
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// Param returns param p for the context.
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func Param(ctx context.Context, p string) string {
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return ctx.Value(param(p)).(string)
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}
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// WithParam returns a new context with param p set to v.
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func WithParam(ctx context.Context, p, v string) context.Context {
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return context.WithValue(ctx, param(p), v)
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}
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// Router wraps httprouter.Router and adds support for prefixed sub-routers
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// and per-request context injections.
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type Router struct {
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rtr *httprouter.Router
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prefix string
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}
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// New returns a new Router.
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func New() *Router {
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return &Router{
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rtr: httprouter.New(),
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}
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}
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// WithPrefix returns a router that prefixes all registered routes with prefix.
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func (r *Router) WithPrefix(prefix string) *Router {
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return &Router{rtr: r.rtr, prefix: r.prefix + prefix}
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}
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// handle turns a HandlerFunc into an httprouter.Handle.
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func (r *Router) handle(h http.HandlerFunc) httprouter.Handle {
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return func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
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ctx, cancel := context.WithCancel(req.Context())
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defer cancel()
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for _, p := range params {
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ctx = context.WithValue(ctx, param(p.Key), p.Value)
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}
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h(w, req.WithContext(ctx))
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}
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}
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// Get registers a new GET route.
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func (r *Router) Get(path string, h http.HandlerFunc) {
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r.rtr.GET(r.prefix+path, r.handle(h))
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}
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// Options registers a new OPTIONS route.
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func (r *Router) Options(path string, h http.HandlerFunc) {
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r.rtr.OPTIONS(r.prefix+path, r.handle(h))
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}
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// Del registers a new DELETE route.
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func (r *Router) Del(path string, h http.HandlerFunc) {
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r.rtr.DELETE(r.prefix+path, r.handle(h))
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}
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// Put registers a new PUT route.
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func (r *Router) Put(path string, h http.HandlerFunc) {
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r.rtr.PUT(r.prefix+path, r.handle(h))
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}
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// Post registers a new POST route.
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func (r *Router) Post(path string, h http.HandlerFunc) {
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r.rtr.POST(r.prefix+path, r.handle(h))
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}
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// Redirect takes an absolute path and sends an internal HTTP redirect for it,
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// prefixed by the router's path prefix. Note that this method does not include
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// functionality for handling relative paths or full URL redirects.
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func (r *Router) Redirect(w http.ResponseWriter, req *http.Request, path string, code int) {
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http.Redirect(w, req, r.prefix+path, code)
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}
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// ServeHTTP implements http.Handler.
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func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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r.rtr.ServeHTTP(w, req)
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}
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// FileServe returns a new http.HandlerFunc that serves files from dir.
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// Using routes must provide the *filepath parameter.
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func FileServe(dir string) http.HandlerFunc {
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fs := http.FileServer(http.Dir(dir))
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return func(w http.ResponseWriter, r *http.Request) {
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r.URL.Path = Param(r.Context(), "filepath")
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fs.ServeHTTP(w, r)
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}
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}
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