text: // Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
  // Use of this source code is governed by a MIT style
  // license that can be found in the LICENSE file.
  
  package binding
  
  import (
  	"mime/multipart"
  	"net/http"
  	"reflect"
  )
  
  const defaultMemory = 32 * 1024 * 1024
  
  type formBinding struct{}
  type formPostBinding struct{}
  type formMultipartBinding struct{}
  
  func (formBinding) Name() string {
  	return "form"
  }
  
  func (formBinding) Bind(req *http.Request, obj interface{}) error {
  	if err := req.ParseForm(); err != nil {
  		return err
  	}
  	if err := req.ParseMultipartForm(defaultMemory); err != nil {
  		if err != http.ErrNotMultipart {
  			return err
  		}
  	}
  	if err := mapForm(obj, req.Form); err != nil {
  		return err
  	}
  	return validate(obj)
  }
  
  func (formPostBinding) Name() string {
  	return "form-urlencoded"
  }
  
  func (formPostBinding) Bind(req *http.Request, obj interface{}) error {
  	if err := req.ParseForm(); err != nil {
  		return err
  	}
  	if err := mapForm(obj, req.PostForm); err != nil {
  		return err
  	}
  	return validate(obj)
  }
  
  func (formMultipartBinding) Name() string {
  	return "multipart/form-data"
  }
  
  func (formMultipartBinding) Bind(req *http.Request, obj interface{}) error {
  	if err := req.ParseMultipartForm(defaultMemory); err != nil {
  		return err
  	}
  	if err := mappingByPtr(obj, (*multipartRequest)(req), "form"); err != nil {
  		return err
  	}
  
  	return validate(obj)
  }
  
  type multipartRequest http.Request
  
  var _ setter = (*multipartRequest)(nil)
  
  var (
  	multipartFileHeaderStructType = reflect.TypeOf(multipart.FileHeader{})
  )
  
  // TrySet tries to set a value by the multipart request with the binding a form file
  func (r *multipartRequest) TrySet(value reflect.Value, field reflect.StructField, key string, opt setOptions) (isSetted bool, err error) {
  	if value.Type() == multipartFileHeaderStructType {
  		_, file, err := (*http.Request)(r).FormFile(key)
  		if err != nil {
  			return false, err
  		}
  		if file != nil {
  			value.Set(reflect.ValueOf(*file))
  			return true, nil
  		}
  	}
  
  	return setByForm(value, field, r.MultipartForm.Value, key, opt)
  }
  