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// Copyright 2017 Northern.tech AS
//
// 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 routing
import (
"net/http"
"github.com/ant0ine/go-json-rest/rest"
"github.com/mendersoftware/go-lib-micro/strings"
)
type HttpOptionsGenerator func(methods []string) rest.HandlerFunc
func AllowHeaderOptionsGenerator(methods []string) rest.HandlerFunc {
// return a dummy handler for now
return func(w rest.ResponseWriter, r *rest.Request) {
for _, m := range methods {
w.Header().Add("Allow", m)
}
}
}
func supportsMethod(method string, methods []string) bool {
return strings.ContainsString(method, methods)
}
// Automatically add OPTIONS method support for each defined route,
// only if there's no OPTIONS handler for that route yet
func AutogenOptionsRoutes(routes []*rest.Route, gen HttpOptionsGenerator) []*rest.Route {
methodGroups := make(map[string][]string, len(routes))
for _, route := range routes {
methods, ok := methodGroups[route.PathExp]
if !ok {
methods = make([]string, 0, 0)
}
methodGroups[route.PathExp] = append(methods, route.HttpMethod)
}
options := make([]*rest.Route, 0, len(methodGroups))
for route, methods := range methodGroups {
// skip if there's a handler for OPTIONS already
if supportsMethod(http.MethodOptions, methods) == false {
options = append(options,
rest.Options(route, gen(methods)))
}
}
return append(routes, options...)
}
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