470 lines
15 KiB
Go
470 lines
15 KiB
Go
// Copyright 2013 The Martini Contrib Authors. All rights reserved.
|
|
// Copyright 2014 The Gogs Authors. 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 (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"reflect"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"unicode/utf8"
|
|
|
|
"github.com/go-martini/martini"
|
|
)
|
|
|
|
/*
|
|
To the land of Middle-ware Earth:
|
|
|
|
One func to rule them all,
|
|
One func to find them,
|
|
One func to bring them all,
|
|
And in this package BIND them.
|
|
*/
|
|
|
|
// Bind accepts a copy of an empty struct and populates it with
|
|
// values from the request (if deserialization is successful). It
|
|
// wraps up the functionality of the Form and Json middleware
|
|
// according to the Content-Type of the request, and it guesses
|
|
// if no Content-Type is specified. Bind invokes the ErrorHandler
|
|
// middleware to bail out if errors occurred. If you want to perform
|
|
// your own error handling, use Form or Json middleware directly.
|
|
// An interface pointer can be added as a second argument in order
|
|
// to map the struct to a specific interface.
|
|
func Bind(obj interface{}, ifacePtr ...interface{}) martini.Handler {
|
|
return func(context martini.Context, req *http.Request) {
|
|
contentType := req.Header.Get("Content-Type")
|
|
|
|
if strings.Contains(contentType, "form-urlencoded") {
|
|
context.Invoke(Form(obj, ifacePtr...))
|
|
} else if strings.Contains(contentType, "multipart/form-data") {
|
|
context.Invoke(MultipartForm(obj, ifacePtr...))
|
|
} else if strings.Contains(contentType, "json") {
|
|
context.Invoke(Json(obj, ifacePtr...))
|
|
} else {
|
|
context.Invoke(Json(obj, ifacePtr...))
|
|
if getErrors(context).Count() > 0 {
|
|
context.Invoke(Form(obj, ifacePtr...))
|
|
}
|
|
}
|
|
|
|
context.Invoke(ErrorHandler)
|
|
}
|
|
}
|
|
|
|
// BindIgnErr will do the exactly same thing as Bind but without any
|
|
// error handling, which user has freedom to deal with them.
|
|
// This allows user take advantages of validation.
|
|
func BindIgnErr(obj interface{}, ifacePtr ...interface{}) martini.Handler {
|
|
return func(context martini.Context, req *http.Request) {
|
|
contentType := req.Header.Get("Content-Type")
|
|
|
|
if strings.Contains(contentType, "form-urlencoded") {
|
|
context.Invoke(Form(obj, ifacePtr...))
|
|
} else if strings.Contains(contentType, "multipart/form-data") {
|
|
context.Invoke(MultipartForm(obj, ifacePtr...))
|
|
} else if strings.Contains(contentType, "json") {
|
|
context.Invoke(Json(obj, ifacePtr...))
|
|
} else {
|
|
context.Invoke(Json(obj, ifacePtr...))
|
|
if getErrors(context).Count() > 0 {
|
|
context.Invoke(Form(obj, ifacePtr...))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Form is middleware to deserialize form-urlencoded data from the request.
|
|
// It gets data from the form-urlencoded body, if present, or from the
|
|
// query string. It uses the http.Request.ParseForm() method
|
|
// to perform deserialization, then reflection is used to map each field
|
|
// into the struct with the proper type. Structs with primitive slice types
|
|
// (bool, float, int, string) can support deserialization of repeated form
|
|
// keys, for example: key=val1&key=val2&key=val3
|
|
// An interface pointer can be added as a second argument in order
|
|
// to map the struct to a specific interface.
|
|
func Form(formStruct interface{}, ifacePtr ...interface{}) martini.Handler {
|
|
return func(context martini.Context, req *http.Request) {
|
|
ensureNotPointer(formStruct)
|
|
formStruct := reflect.New(reflect.TypeOf(formStruct))
|
|
errors := newErrors()
|
|
parseErr := req.ParseForm()
|
|
|
|
// Format validation of the request body or the URL would add considerable overhead,
|
|
// and ParseForm does not complain when URL encoding is off.
|
|
// Because an empty request body or url can also mean absence of all needed values,
|
|
// it is not in all cases a bad request, so let's return 422.
|
|
if parseErr != nil {
|
|
errors.Overall[BindingDeserializationError] = parseErr.Error()
|
|
}
|
|
|
|
mapForm(formStruct, req.Form, errors)
|
|
|
|
validateAndMap(formStruct, context, errors, ifacePtr...)
|
|
}
|
|
}
|
|
|
|
func MultipartForm(formStruct interface{}, ifacePtr ...interface{}) martini.Handler {
|
|
return func(context martini.Context, req *http.Request) {
|
|
ensureNotPointer(formStruct)
|
|
formStruct := reflect.New(reflect.TypeOf(formStruct))
|
|
errors := newErrors()
|
|
|
|
// Workaround for multipart forms returning nil instead of an error
|
|
// when content is not multipart
|
|
// https://code.google.com/p/go/issues/detail?id=6334
|
|
multipartReader, err := req.MultipartReader()
|
|
if err != nil {
|
|
errors.Overall[BindingDeserializationError] = err.Error()
|
|
} else {
|
|
form, parseErr := multipartReader.ReadForm(MaxMemory)
|
|
|
|
if parseErr != nil {
|
|
errors.Overall[BindingDeserializationError] = parseErr.Error()
|
|
}
|
|
|
|
req.MultipartForm = form
|
|
}
|
|
|
|
mapForm(formStruct, req.MultipartForm.Value, errors)
|
|
|
|
validateAndMap(formStruct, context, errors, ifacePtr...)
|
|
}
|
|
}
|
|
|
|
// Json is middleware to deserialize a JSON payload from the request
|
|
// into the struct that is passed in. The resulting struct is then
|
|
// validated, but no error handling is actually performed here.
|
|
// An interface pointer can be added as a second argument in order
|
|
// to map the struct to a specific interface.
|
|
func Json(jsonStruct interface{}, ifacePtr ...interface{}) martini.Handler {
|
|
return func(context martini.Context, req *http.Request) {
|
|
ensureNotPointer(jsonStruct)
|
|
jsonStruct := reflect.New(reflect.TypeOf(jsonStruct))
|
|
errors := newErrors()
|
|
|
|
if req.Body != nil {
|
|
defer req.Body.Close()
|
|
}
|
|
|
|
if err := json.NewDecoder(req.Body).Decode(jsonStruct.Interface()); err != nil && err != io.EOF {
|
|
errors.Overall[BindingDeserializationError] = err.Error()
|
|
}
|
|
|
|
validateAndMap(jsonStruct, context, errors, ifacePtr...)
|
|
}
|
|
}
|
|
|
|
// Validate is middleware to enforce required fields. If the struct
|
|
// passed in is a Validator, then the user-defined Validate method
|
|
// is executed, and its errors are mapped to the context. This middleware
|
|
// performs no error handling: it merely detects them and maps them.
|
|
func Validate(obj interface{}) martini.Handler {
|
|
return func(context martini.Context, req *http.Request) {
|
|
errors := newErrors()
|
|
validateStruct(errors, obj)
|
|
|
|
if validator, ok := obj.(Validator); ok {
|
|
validator.Validate(errors, req, context)
|
|
}
|
|
context.Map(*errors)
|
|
}
|
|
}
|
|
|
|
var (
|
|
alphaDashPattern = regexp.MustCompile("[^\\d\\w-_]")
|
|
alphaDashDotPattern = regexp.MustCompile("[^\\d\\w-_\\.]")
|
|
emailPattern = regexp.MustCompile("[\\w!#$%&'*+/=?^_`{|}~-]+(?:\\.[\\w!#$%&'*+/=?^_`{|}~-]+)*@(?:[\\w](?:[\\w-]*[\\w])?\\.)+[a-zA-Z0-9](?:[\\w-]*[\\w])?")
|
|
urlPattern = regexp.MustCompile(`(http|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?`)
|
|
)
|
|
|
|
func validateStruct(errors *BindingErrors, obj interface{}) {
|
|
typ := reflect.TypeOf(obj)
|
|
val := reflect.ValueOf(obj)
|
|
|
|
if typ.Kind() == reflect.Ptr {
|
|
typ = typ.Elem()
|
|
val = val.Elem()
|
|
}
|
|
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
field := typ.Field(i)
|
|
|
|
// Allow ignored fields in the struct
|
|
if field.Tag.Get("form") == "-" {
|
|
continue
|
|
}
|
|
|
|
fieldValue := val.Field(i).Interface()
|
|
if field.Type.Kind() == reflect.Struct {
|
|
validateStruct(errors, fieldValue)
|
|
continue
|
|
}
|
|
|
|
zero := reflect.Zero(field.Type).Interface()
|
|
|
|
// Match rules.
|
|
for _, rule := range strings.Split(field.Tag.Get("binding"), ";") {
|
|
if len(rule) == 0 {
|
|
continue
|
|
}
|
|
|
|
switch {
|
|
case rule == "Required":
|
|
if reflect.DeepEqual(zero, fieldValue) {
|
|
errors.Fields[field.Name] = BindingRequireError
|
|
break
|
|
}
|
|
case rule == "AlphaDash":
|
|
if alphaDashPattern.MatchString(fmt.Sprintf("%v", fieldValue)) {
|
|
errors.Fields[field.Name] = BindingAlphaDashError
|
|
break
|
|
}
|
|
case rule == "AlphaDashDot":
|
|
if alphaDashDotPattern.MatchString(fmt.Sprintf("%v", fieldValue)) {
|
|
errors.Fields[field.Name] = BindingAlphaDashDotError
|
|
break
|
|
}
|
|
case strings.HasPrefix(rule, "MinSize("):
|
|
min, err := strconv.Atoi(rule[8 : len(rule)-1])
|
|
if err != nil {
|
|
errors.Overall["MinSize"] = err.Error()
|
|
break
|
|
}
|
|
if str, ok := fieldValue.(string); ok && utf8.RuneCountInString(str) < min {
|
|
errors.Fields[field.Name] = BindingMinSizeError
|
|
break
|
|
}
|
|
v := reflect.ValueOf(fieldValue)
|
|
if v.Kind() == reflect.Slice && v.Len() < min {
|
|
errors.Fields[field.Name] = BindingMinSizeError
|
|
break
|
|
}
|
|
case strings.HasPrefix(rule, "MaxSize("):
|
|
max, err := strconv.Atoi(rule[8 : len(rule)-1])
|
|
if err != nil {
|
|
errors.Overall["MaxSize"] = err.Error()
|
|
break
|
|
}
|
|
if str, ok := fieldValue.(string); ok && utf8.RuneCountInString(str) > max {
|
|
errors.Fields[field.Name] = BindingMaxSizeError
|
|
break
|
|
}
|
|
v := reflect.ValueOf(fieldValue)
|
|
if v.Kind() == reflect.Slice && v.Len() > max {
|
|
errors.Fields[field.Name] = BindingMinSizeError
|
|
break
|
|
}
|
|
case rule == "Email":
|
|
if !emailPattern.MatchString(fmt.Sprintf("%v", fieldValue)) {
|
|
errors.Fields[field.Name] = BindingEmailError
|
|
break
|
|
}
|
|
case rule == "Url":
|
|
if !urlPattern.MatchString(fmt.Sprintf("%v", fieldValue)) {
|
|
errors.Fields[field.Name] = BindingUrlError
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func mapForm(formStruct reflect.Value, form map[string][]string, errors *BindingErrors) {
|
|
typ := formStruct.Elem().Type()
|
|
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
typeField := typ.Field(i)
|
|
if inputFieldName := typeField.Tag.Get("form"); inputFieldName != "" {
|
|
structField := formStruct.Elem().Field(i)
|
|
if !structField.CanSet() {
|
|
continue
|
|
}
|
|
|
|
inputValue, exists := form[inputFieldName]
|
|
|
|
if !exists {
|
|
continue
|
|
}
|
|
|
|
numElems := len(inputValue)
|
|
if structField.Kind() == reflect.Slice && numElems > 0 {
|
|
sliceOf := structField.Type().Elem().Kind()
|
|
slice := reflect.MakeSlice(structField.Type(), numElems, numElems)
|
|
for i := 0; i < numElems; i++ {
|
|
setWithProperType(sliceOf, inputValue[i], slice.Index(i), inputFieldName, errors)
|
|
}
|
|
formStruct.Elem().Field(i).Set(slice)
|
|
} else {
|
|
setWithProperType(typeField.Type.Kind(), inputValue[0], structField, inputFieldName, errors)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// ErrorHandler simply counts the number of errors in the
|
|
// context and, if more than 0, writes a 400 Bad Request
|
|
// response and a JSON payload describing the errors with
|
|
// the "Content-Type" set to "application/json".
|
|
// Middleware remaining on the stack will not even see the request
|
|
// if, by this point, there are any errors.
|
|
// This is a "default" handler, of sorts, and you are
|
|
// welcome to use your own instead. The Bind middleware
|
|
// invokes this automatically for convenience.
|
|
func ErrorHandler(errs BindingErrors, resp http.ResponseWriter) {
|
|
if errs.Count() > 0 {
|
|
resp.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
if _, ok := errs.Overall[BindingDeserializationError]; ok {
|
|
resp.WriteHeader(http.StatusBadRequest)
|
|
} else {
|
|
resp.WriteHeader(422)
|
|
}
|
|
errOutput, _ := json.Marshal(errs)
|
|
resp.Write(errOutput)
|
|
return
|
|
}
|
|
}
|
|
|
|
// This sets the value in a struct of an indeterminate type to the
|
|
// matching value from the request (via Form middleware) in the
|
|
// same type, so that not all deserialized values have to be strings.
|
|
// Supported types are string, int, float, and bool.
|
|
func setWithProperType(valueKind reflect.Kind, val string, structField reflect.Value, nameInTag string, errors *BindingErrors) {
|
|
switch valueKind {
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
if val == "" {
|
|
val = "0"
|
|
}
|
|
intVal, err := strconv.ParseInt(val, 10, 64)
|
|
if err != nil {
|
|
errors.Fields[nameInTag] = BindingIntegerTypeError
|
|
} else {
|
|
structField.SetInt(intVal)
|
|
}
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
|
if val == "" {
|
|
val = "0"
|
|
}
|
|
uintVal, err := strconv.ParseUint(val, 10, 64)
|
|
if err != nil {
|
|
errors.Fields[nameInTag] = BindingIntegerTypeError
|
|
} else {
|
|
structField.SetUint(uintVal)
|
|
}
|
|
case reflect.Bool:
|
|
structField.SetBool(val == "on")
|
|
case reflect.Float32:
|
|
if val == "" {
|
|
val = "0.0"
|
|
}
|
|
floatVal, err := strconv.ParseFloat(val, 32)
|
|
if err != nil {
|
|
errors.Fields[nameInTag] = BindingFloatTypeError
|
|
} else {
|
|
structField.SetFloat(floatVal)
|
|
}
|
|
case reflect.Float64:
|
|
if val == "" {
|
|
val = "0.0"
|
|
}
|
|
floatVal, err := strconv.ParseFloat(val, 64)
|
|
if err != nil {
|
|
errors.Fields[nameInTag] = BindingFloatTypeError
|
|
} else {
|
|
structField.SetFloat(floatVal)
|
|
}
|
|
case reflect.String:
|
|
structField.SetString(val)
|
|
}
|
|
}
|
|
|
|
// Don't pass in pointers to bind to. Can lead to bugs. See:
|
|
// https://github.com/codegangsta/martini-contrib/issues/40
|
|
// https://github.com/codegangsta/martini-contrib/pull/34#issuecomment-29683659
|
|
func ensureNotPointer(obj interface{}) {
|
|
if reflect.TypeOf(obj).Kind() == reflect.Ptr {
|
|
panic("Pointers are not accepted as binding models")
|
|
}
|
|
}
|
|
|
|
// Performs validation and combines errors from validation
|
|
// with errors from deserialization, then maps both the
|
|
// resulting struct and the errors to the context.
|
|
func validateAndMap(obj reflect.Value, context martini.Context, errors *BindingErrors, ifacePtr ...interface{}) {
|
|
context.Invoke(Validate(obj.Interface()))
|
|
errors.Combine(getErrors(context))
|
|
context.Map(*errors)
|
|
context.Map(obj.Elem().Interface())
|
|
if len(ifacePtr) > 0 {
|
|
context.MapTo(obj.Elem().Interface(), ifacePtr[0])
|
|
}
|
|
}
|
|
|
|
func newErrors() *BindingErrors {
|
|
return &BindingErrors{make(map[string]string), make(map[string]string)}
|
|
}
|
|
|
|
func getErrors(context martini.Context) BindingErrors {
|
|
return context.Get(reflect.TypeOf(BindingErrors{})).Interface().(BindingErrors)
|
|
}
|
|
|
|
type (
|
|
// Implement the Validator interface to define your own input
|
|
// validation before the request even gets to your application.
|
|
// The Validate method will be executed during the validation phase.
|
|
Validator interface {
|
|
Validate(*BindingErrors, *http.Request, martini.Context)
|
|
}
|
|
)
|
|
|
|
var (
|
|
// Maximum amount of memory to use when parsing a multipart form.
|
|
// Set this to whatever value you prefer; default is 10 MB.
|
|
MaxMemory = int64(1024 * 1024 * 10)
|
|
)
|
|
|
|
// Errors represents the contract of the response body when the
|
|
// binding step fails before getting to the application.
|
|
type BindingErrors struct {
|
|
Overall map[string]string `json:"overall"`
|
|
Fields map[string]string `json:"fields"`
|
|
}
|
|
|
|
// Total errors is the sum of errors with the request overall
|
|
// and errors on individual fields.
|
|
func (err BindingErrors) Count() int {
|
|
return len(err.Overall) + len(err.Fields)
|
|
}
|
|
|
|
func (this *BindingErrors) Combine(other BindingErrors) {
|
|
for key, val := range other.Fields {
|
|
if _, exists := this.Fields[key]; !exists {
|
|
this.Fields[key] = val
|
|
}
|
|
}
|
|
for key, val := range other.Overall {
|
|
if _, exists := this.Overall[key]; !exists {
|
|
this.Overall[key] = val
|
|
}
|
|
}
|
|
}
|
|
|
|
const (
|
|
BindingRequireError string = "Required"
|
|
BindingAlphaDashError string = "AlphaDash"
|
|
BindingAlphaDashDotError string = "AlphaDashDot"
|
|
BindingMinSizeError string = "MinSize"
|
|
BindingMaxSizeError string = "MaxSize"
|
|
BindingEmailError string = "Email"
|
|
BindingUrlError string = "Url"
|
|
BindingDeserializationError string = "DeserializationError"
|
|
BindingIntegerTypeError string = "IntegerTypeError"
|
|
BindingBooleanTypeError string = "BooleanTypeError"
|
|
BindingFloatTypeError string = "FloatTypeError"
|
|
)
|