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// Copyright 2015 go-swagger maintainers
//
// 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 middleware
import (
"mime"
"net/http"
"github.com/go-openapi/errors"
"github.com/go-openapi/runtime"
"github.com/go-openapi/swag"
)
// NewValidation starts a new validation middleware
func newValidation(ctx *Context, next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
matched, _ := ctx.RouteInfo(r)
_, result := ctx.BindAndValidate(r, matched)
if result != nil {
ctx.Respond(rw, r, matched.Produces, matched, result)
return
}
next.ServeHTTP(rw, r)
})
}
type validation struct {
context *Context
result []error
request *http.Request
route *MatchedRoute
bound map[string]interface{}
}
type untypedBinder map[string]interface{}
func (ub untypedBinder) BindRequest(r *http.Request, route *MatchedRoute, consumer runtime.Consumer) error {
if err := route.Binder.Bind(r, route.Params, consumer, ub); err != nil {
return err
}
return nil
}
// ContentType validates the content type of a request
func validateContentType(allowed []string, actual string) error {
if len(allowed) == 0 {
return nil
}
mt, _, err := mime.ParseMediaType(actual)
if err != nil {
return errors.InvalidContentType(actual, allowed)
}
if swag.ContainsStringsCI(allowed, mt) {
return nil
}
return errors.InvalidContentType(actual, allowed)
}
func validateRequest(ctx *Context, request *http.Request, route *MatchedRoute) *validation {
validate := &validation{
context: ctx,
request: request,
route: route,
bound: make(map[string]interface{}),
}
validate.contentType()
if len(validate.result) == 0 {
validate.responseFormat()
}
if len(validate.result) == 0 {
validate.parameters()
}
return validate
}
func (v *validation) parameters() {
if result := v.route.Binder.Bind(v.request, v.route.Params, v.route.Consumer, v.bound); result != nil {
if result.Error() == "validation failure list" {
for _, e := range result.(*errors.Validation).Value.([]interface{}) {
v.result = append(v.result, e.(error))
}
return
}
v.result = append(v.result, result)
}
}
func (v *validation) contentType() {
if len(v.result) == 0 && runtime.HasBody(v.request) {
ct, _, err := v.context.ContentType(v.request)
if err != nil {
v.result = append(v.result, err)
}
if len(v.result) == 0 {
if err := validateContentType(v.route.Consumes, ct); err != nil {
v.result = append(v.result, err)
}
}
if ct != "" && v.route.Consumer == nil {
cons, ok := v.route.Consumers[ct]
if !ok {
v.result = append(v.result, errors.New(500, "no consumer registered for %s", ct))
} else {
v.route.Consumer = cons
}
}
}
}
func (v *validation) responseFormat() {
if str := v.context.ResponseFormat(v.request, v.route.Produces); str == "" && runtime.HasBody(v.request) {
v.result = append(v.result, errors.InvalidResponseFormat(v.request.Header.Get(runtime.HeaderAccept), v.route.Produces))
}
}
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