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