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// Copyright 2017 PingCAP, Inc.
//
// 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 fn
import (
"context"
"io"
"mime/multipart"
"net/http"
"net/url"
"reflect"
)
type valuer func(r *http.Request) (reflect.Value, error)
var contextType = reflect.TypeOf((*context.Context)(nil)).Elem()
// BenchmarkIsBuiltinType-8 100000000 23.1 ns/op 0 B/op 0 allocs/op
var supportTypes = map[reflect.Type]valuer{
reflect.TypeOf((*io.ReadCloser)(nil)).Elem(): bodyValuer, // request.Body
reflect.TypeOf((http.Header)(nil)): headerValuer, // request.Header
reflect.TypeOf(Form{}): formValuer, // request.Form
reflect.TypeOf(PostForm{}): postFromValuer, // request.PostFrom
reflect.TypeOf((*Form)(nil)): formPtrValuer, // request.Form
reflect.TypeOf((*PostForm)(nil)): postFromPtrValuer, // request.PostFrom
reflect.TypeOf((*url.URL)(nil)): urlValuer, // request.URL
reflect.TypeOf((*multipart.Form)(nil)): multipartValuer, // request.MultipartForm
reflect.TypeOf((*http.Request)(nil)): requestValuer, // raw request
}
var maxMemory = int64(2 * 1024 * 1024)
type uniform struct {
url.Values
}
type Form struct {
uniform
}
type PostForm struct {
uniform
}
func bodyValuer(r *http.Request) (reflect.Value, error) {
return reflect.ValueOf(r.Body), nil
}
func urlValuer(r *http.Request) (reflect.Value, error) {
return reflect.ValueOf(r.URL), nil
}
func headerValuer(r *http.Request) (reflect.Value, error) {
return reflect.ValueOf(r.Header), nil
}
func multipartValuer(r *http.Request) (reflect.Value, error) {
err := r.ParseMultipartForm(maxMemory)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(r.MultipartForm), nil
}
func formValuer(r *http.Request) (reflect.Value, error) {
err := r.ParseForm()
if err != nil {
return reflect.Value{}, nil
}
return reflect.ValueOf(Form{uniform{r.Form}}), nil
}
func postFromValuer(r *http.Request) (reflect.Value, error) {
err := r.ParseForm()
if err != nil {
return reflect.Value{}, nil
}
return reflect.ValueOf(PostForm{uniform{r.PostForm}}), nil
}
func formPtrValuer(r *http.Request) (reflect.Value, error) {
err := r.ParseForm()
if err != nil {
return reflect.Value{}, nil
}
return reflect.ValueOf(&Form{uniform{r.Form}}), nil
}
func postFromPtrValuer(r *http.Request) (reflect.Value, error) {
err := r.ParseForm()
if err != nil {
return reflect.Value{}, nil
}
return reflect.ValueOf(&PostForm{uniform{r.PostForm}}), nil
}
func requestValuer(r *http.Request) (reflect.Value, error) {
return reflect.ValueOf(r), nil
}
func isBuiltinType(t reflect.Type) bool {
_, ok := supportTypes[t]
return ok
}
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