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paramapi.go
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paramapi.go
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// Copyright 2016 HenryLee. All Rights Reserved.
//
// 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 apiware
import (
"bytes"
"encoding/gob"
"errors"
"fmt"
"io/ioutil"
"mime/multipart"
"net/http"
"net/textproto"
"net/url"
"reflect"
"strconv"
"sync"
// "github.com/valyala/fasthttp"
)
type (
// ParamsAPI defines a parameter model for an web api.
ParamsAPI struct {
name string
params []*Param
//used to create a new struct (non-pointer)
structType reflect.Type
//the raw struct pointer
rawStructPointer interface{}
// rawStructPointer value bytes
defaultValues []byte
// create param name from struct field name
paramNameMapper ParamNameMapper
// decode params from request body
bodydecoder Bodydecoder
//when request Content-Type is multipart/form-data, the max memory for body.
maxMemory int64
}
// Schema is a collection of ParamsAPI
Schema struct {
lib map[string]*ParamsAPI
sync.RWMutex
}
// ParamNameMapper maps param name from struct param name
ParamNameMapper func(fieldName string) (paramName string)
// Bodydecoder decodes params from request body.
Bodydecoder func(dest reflect.Value, body []byte) error
)
var (
defaultSchema = &Schema{
lib: map[string]*ParamsAPI{},
}
)
// NewParamsAPI parses and store the struct object, requires a struct pointer,
// if `paramNameMapper` is nil, `paramNameMapper=toSnake`,
// if `bodydecoder` is nil, `bodydecoder=bodyJONS`,
func NewParamsAPI(
structPointer interface{},
paramNameMapper ParamNameMapper,
bodydecoder Bodydecoder,
) (
*ParamsAPI,
error,
) {
name := reflect.TypeOf(structPointer).String()
v := reflect.ValueOf(structPointer)
if v.Kind() != reflect.Ptr {
return nil, NewError(name, "*", "the binding object must be a struct pointer")
}
v = reflect.Indirect(v)
if v.Kind() != reflect.Struct {
return nil, NewError(name, "*", "the binding object must be a struct pointer")
}
var paramsAPI = &ParamsAPI{
name: name,
params: []*Param{},
structType: v.Type(),
rawStructPointer: structPointer,
}
if paramNameMapper != nil {
paramsAPI.paramNameMapper = paramNameMapper
} else {
paramsAPI.paramNameMapper = toSnake
}
if bodydecoder != nil {
paramsAPI.bodydecoder = bodydecoder
} else {
paramsAPI.bodydecoder = bodyJONS
}
err := paramsAPI.addFields([]int{}, paramsAPI.structType, v)
if err != nil {
return nil, err
}
if !reflect.DeepEqual(reflect.New(paramsAPI.structType).Interface(), paramsAPI.rawStructPointer) {
buf := bytes.NewBuffer(nil)
err = gob.NewEncoder(buf).EncodeValue(v)
if err == nil {
paramsAPI.defaultValues = buf.Bytes()
}
}
defaultSchema.set(paramsAPI)
return paramsAPI, nil
}
// Register is similar to a `NewParamsAPI`, but only return error.
// Parse and store the struct object, requires a struct pointer,
// if `paramNameMapper` is nil, `paramNameMapper=toSnake`,
// if `bodydecoder` is nil, `bodydecoder=bodyJONS`,
func Register(
structPointer interface{},
paramNameMapper ParamNameMapper,
bodydecoder Bodydecoder,
) error {
_, err := NewParamsAPI(structPointer, paramNameMapper, bodydecoder)
return err
}
func (paramsAPI *ParamsAPI) addFields(parentIndexPath []int, t reflect.Type, v reflect.Value) error {
var err error
var maxMemoryMB int64
var hasFormData, hasBody bool
var deep = len(parentIndexPath) + 1
for i := 0; i < t.NumField(); i++ {
indexPath := make([]int, deep)
copy(indexPath, parentIndexPath)
indexPath[deep-1] = i
var field = t.Field(i)
tag, ok := field.Tag.Lookup(TAG_PARAM)
if !ok {
if field.Anonymous && field.Type.Kind() == reflect.Struct {
if err = paramsAPI.addFields(indexPath, field.Type, v.Field(i)); err != nil {
return err
}
}
continue
}
if tag == TAG_IGNORE_PARAM {
continue
}
if field.Type.Kind() == reflect.Ptr && field.Type.String() != fileTypeString && field.Type.String() != cookieTypeString {
return NewError(t.String(), field.Name, "field can not be a pointer")
}
var value = v.Field(i)
if !value.CanSet() {
return NewError(t.String(), field.Name, "field can not be a unexported field")
}
var parsedTags = ParseTags(tag)
var paramPosition = parsedTags[KEY_IN]
var paramTypeString = field.Type.String()
switch paramTypeString {
case fileTypeString, filesTypeString, fileTypeString2, filesTypeString2:
if paramPosition != "formData" {
return NewError(t.String(), field.Name, "when field type is `"+paramTypeString+"`, tag `in` value must be `formData`")
}
case cookieTypeString, cookieTypeString2 /*, fasthttpCookieTypeString*/ :
if paramPosition != "cookie" {
return NewError(t.String(), field.Name, "when field type is `"+paramTypeString+"`, tag `in` value must be `cookie`")
}
}
switch paramPosition {
case "formData":
if hasBody {
return NewError(t.String(), field.Name, "tags of `in(formData)` and `in(body)` can not exist at the same time")
}
hasFormData = true
case "body":
if hasFormData {
return NewError(t.String(), field.Name, "tags of `in(formData)` and `in(body)` can not exist at the same time")
}
if hasBody {
return NewError(t.String(), field.Name, "there should not be more than one tag `in(body)`")
}
hasBody = true
case "path":
parsedTags[KEY_REQUIRED] = KEY_REQUIRED
// case "cookie":
// switch paramTypeString {
// case cookieTypeString, fasthttpCookieTypeString, stringTypeString, bytesTypeString, bytes2TypeString:
// default:
// return NewError( t.String(),field.Name, "invalid field type for `in(cookie)`, refer to the following: `http.Cookie`, `fasthttp.Cookie`, `string`, `[]byte` or `[]uint8`")
// }
default:
if !TagInValues[paramPosition] {
return NewError(t.String(), field.Name, "invalid tag `in` value, refer to the following: `path`, `query`, `formData`, `body`, `header` or `cookie`")
}
}
if _, ok := parsedTags[KEY_LEN]; ok {
switch paramTypeString {
case "string", "[]string", "[]int", "[]int8", "[]int16", "[]int32", "[]int64", "[]uint", "[]uint8", "[]uint16", "[]uint32", "[]uint64", "[]float32", "[]float64":
default:
return NewError(t.String(), field.Name, "invalid `len` tag for non-string or non-basetype-slice field")
}
}
if _, ok := parsedTags[KEY_RANGE]; ok {
switch paramTypeString {
case "int", "int8", "int16", "int32", "int64", "uint", "uint8", "uint16", "uint32", "uint64", "float32", "float64":
case "[]int", "[]int8", "[]int16", "[]int32", "[]int64", "[]uint", "[]uint8", "[]uint16", "[]uint32", "[]uint64", "[]float32", "[]float64":
default:
return NewError(t.String(), field.Name, "invalid `range` tag for non-number field")
}
}
if _, ok := parsedTags[KEY_REGEXP]; ok {
if paramTypeString != "string" && paramTypeString != "[]string" {
return NewError(t.String(), field.Name, "invalid `"+KEY_REGEXP+"` tag for non-string field")
}
}
if a, ok := parsedTags[KEY_MAXMB]; ok {
i, err := strconv.ParseInt(a, 10, 64)
if err != nil {
return NewError(t.String(), field.Name, "invalid `maxmb` tag, it must be positive integer")
}
if i > maxMemoryMB {
maxMemoryMB = i
}
}
fd := &Param{
apiName: paramsAPI.name,
indexPath: indexPath,
tags: parsedTags,
rawTag: field.Tag,
rawValue: value,
}
if errStr, ok := fd.tags[KEY_ERR]; ok {
fd.err = errors.New(errStr)
}
// fmt.Printf("%#v\n", fd.tags)
if fd.name, ok = parsedTags[KEY_NAME]; !ok {
fd.name = paramsAPI.paramNameMapper(field.Name)
}
if paramPosition == "header" {
fd.name = textproto.CanonicalMIMEHeaderKey(fd.name)
}
fd.isFile = paramTypeString == fileTypeString || paramTypeString == filesTypeString || paramTypeString == fileTypeString2 || paramTypeString == filesTypeString2
_, fd.isRequired = parsedTags[KEY_REQUIRED]
_, hasNonzero := parsedTags[KEY_NONZERO]
if !fd.isRequired && (hasNonzero || len(parsedTags[KEY_RANGE]) > 0) {
fd.isRequired = true
}
if err = fd.makeVerifyFuncs(); err != nil {
return NewError(t.String(), field.Name, "initial validation failed:"+err.Error())
}
paramsAPI.params = append(paramsAPI.params, fd)
}
if maxMemoryMB > 0 {
paramsAPI.maxMemory = maxMemoryMB * MB
} else {
paramsAPI.maxMemory = defaultMaxMemory
}
return nil
}
// GetParamsAPI gets the `*ParamsAPI` object according to the type name
func GetParamsAPI(paramsAPIName string) (*ParamsAPI, error) {
paramsAPI, ok := defaultSchema.get(paramsAPIName)
if !ok {
return nil, errors.New("struct `" + paramsAPIName + "` is not registered")
}
return paramsAPI, nil
}
// SetParamsAPI caches `*ParamsAPI`
func SetParamsAPI(paramsAPI *ParamsAPI) {
defaultSchema.set(paramsAPI)
}
func (schema *Schema) get(paramsAPIName string) (*ParamsAPI, bool) {
schema.RLock()
defer schema.RUnlock()
paramsAPI, ok := schema.lib[paramsAPIName]
return paramsAPI, ok
}
func (schema *Schema) set(paramsAPI *ParamsAPI) {
schema.Lock()
schema.lib[paramsAPI.name] = paramsAPI
defer schema.Unlock()
}
// Name gets the name
func (paramsAPI *ParamsAPI) Name() string {
return paramsAPI.name
}
// Params gets the parameter information
func (paramsAPI *ParamsAPI) Params() []*Param {
return paramsAPI.params
}
// Number returns the number of parameters to be bound
func (paramsAPI *ParamsAPI) Number() int {
return len(paramsAPI.params)
}
// Raw returns the ParamsAPI's original value
func (paramsAPI *ParamsAPI) Raw() interface{} {
return paramsAPI.rawStructPointer
}
// MaxMemory gets maxMemory
// when request Content-Type is multipart/form-data, the max memory for body.
func (paramsAPI *ParamsAPI) MaxMemory() int64 {
return paramsAPI.maxMemory
}
// SetMaxMemory sets maxMemory for the request which Content-Type is multipart/form-data.
func (paramsAPI *ParamsAPI) SetMaxMemory(maxMemory int64) {
paramsAPI.maxMemory = maxMemory
}
// NewReceiver creates a new struct pointer and the field's values for its receive parameterste it.
func (paramsAPI *ParamsAPI) NewReceiver() (interface{}, []reflect.Value) {
object := reflect.New(paramsAPI.structType)
if len(paramsAPI.defaultValues) > 0 {
// fmt.Printf("setting default value: %s\n", paramsAPI.structType.String())
de := gob.NewDecoder(bytes.NewReader(paramsAPI.defaultValues))
err := de.DecodeValue(object.Elem())
if err != nil {
panic(err)
}
}
return object.Interface(), paramsAPI.fieldsForBinding(object.Elem())
}
func (paramsAPI *ParamsAPI) fieldsForBinding(structElem reflect.Value) []reflect.Value {
count := len(paramsAPI.params)
fields := make([]reflect.Value, count)
for i := 0; i < count; i++ {
value := structElem
param := paramsAPI.params[i]
for _, index := range param.indexPath {
value = value.Field(index)
}
fields[i] = value
}
return fields
}
// BindByName binds the net/http request params to a new struct and validate it.
func BindByName(
paramsAPIName string,
req *http.Request,
pathParams KV,
) (
interface{},
error,
) {
paramsAPI, err := GetParamsAPI(paramsAPIName)
if err != nil {
return nil, err
}
return paramsAPI.BindNew(req, pathParams)
}
// Bind binds the net/http request params to the `structPointer` param and validate it.
// note: structPointer must be struct pointer.
func Bind(
structPointer interface{},
req *http.Request,
pathParams KV,
) error {
paramsAPI, err := GetParamsAPI(reflect.TypeOf(structPointer).String())
if err != nil {
return err
}
return paramsAPI.BindAt(structPointer, req, pathParams)
}
// BindAt binds the net/http request params to a struct pointer and validate it.
// note: structPointer must be struct pointer.
func (paramsAPI *ParamsAPI) BindAt(
structPointer interface{},
req *http.Request,
pathParams KV,
) error {
name := reflect.TypeOf(structPointer).String()
if name != paramsAPI.name {
return errors.New("the structPointer's type `" + name + "` does not match type `" + paramsAPI.name + "`")
}
return paramsAPI.BindFields(
paramsAPI.fieldsForBinding(reflect.ValueOf(structPointer).Elem()),
req,
pathParams,
)
}
// BindNew binds the net/http request params to a struct pointer and validate it.
func (paramsAPI *ParamsAPI) BindNew(
req *http.Request,
pathParams KV,
) (
interface{},
error,
) {
structPrinter, fields := paramsAPI.NewReceiver()
err := paramsAPI.BindFields(fields, req, pathParams)
return structPrinter, err
}
// RawBind binds the net/http request params to the original struct pointer and validate it.
func (paramsAPI *ParamsAPI) RawBind(
req *http.Request,
pathParams KV,
) (
interface{},
error,
) {
var fields []reflect.Value
for _, param := range paramsAPI.params {
fields = append(fields, param.rawValue)
}
err := paramsAPI.BindFields(fields, req, pathParams)
return paramsAPI.rawStructPointer, err
}
// BindFields binds the net/http request params to a struct and validate it.
// Must ensure that the param `fields` matches `paramsAPI.params`.
func (paramsAPI *ParamsAPI) BindFields(
fields []reflect.Value,
req *http.Request,
pathParams KV,
) (
err error,
) {
if pathParams == nil {
pathParams = Map(map[string]string{})
}
if req.Form == nil {
req.ParseMultipartForm(paramsAPI.maxMemory)
}
var queryValues url.Values
defer func() {
if p := recover(); p != nil {
err = NewError(paramsAPI.name, "?", fmt.Sprint(p))
}
}()
for i, param := range paramsAPI.params {
value := fields[i]
switch param.In() {
case "path":
paramValue, ok := pathParams.Get(param.name)
if !ok {
return param.myError("missing path param")
}
// fmt.Printf("paramName:%s\nvalue:%#v\n\n", param.name, paramValue)
if err = convertAssign(value, []string{paramValue}); err != nil {
return param.myError(err.Error())
}
case "query":
if queryValues == nil {
queryValues, err = url.ParseQuery(req.URL.RawQuery)
if err != nil {
queryValues = make(url.Values)
}
}
paramValues, ok := queryValues[param.name]
if ok {
if err = convertAssign(value, paramValues); err != nil {
return param.myError(err.Error())
}
} else if param.IsRequired() {
return param.myError("missing query param")
}
case "formData":
// Can not exist with `body` param at the same time
if param.IsFile() {
if req.MultipartForm != nil {
fhs := req.MultipartForm.File[param.name]
if len(fhs) == 0 {
if param.IsRequired() {
return param.myError("missing formData param")
}
continue
}
typ := value.Type()
switch typ.String() {
case fileTypeString:
value.Set(reflect.ValueOf(fhs[0]))
case fileTypeString2:
value.Set(reflect.ValueOf(fhs[0]).Elem())
case filesTypeString:
value.Set(reflect.ValueOf(fhs))
case filesTypeString2:
fhs2 := make([]multipart.FileHeader, len(fhs))
for i, fh := range fhs {
fhs2[i] = *fh
}
value.Set(reflect.ValueOf(fhs2))
default:
return param.myError(
"the param type is incorrect, reference: " +
fileTypeString +
"," + filesTypeString,
)
}
} else if param.IsRequired() {
return param.myError("missing formData param")
}
continue
}
paramValues, ok := req.PostForm[param.name]
if ok {
if err = convertAssign(value, paramValues); err != nil {
return param.myError(err.Error())
}
} else if param.IsRequired() {
return param.myError("missing formData param")
}
case "body":
// Theoretically there should be at most one `body` param, and can not exist with `formData` at the same time
var body []byte
body, err = ioutil.ReadAll(req.Body)
req.Body.Close()
if err == nil {
if err = paramsAPI.bodydecoder(value, body); err != nil {
return param.myError(err.Error())
}
} else if param.IsRequired() {
return param.myError("missing body param")
}
case "header":
paramValues, ok := req.Header[param.name]
if ok {
if err = convertAssign(value, paramValues); err != nil {
return param.myError(err.Error())
}
} else if param.IsRequired() {
return param.myError("missing header param")
}
case "cookie":
c, _ := req.Cookie(param.name)
if c != nil {
switch value.Type().String() {
case cookieTypeString:
value.Set(reflect.ValueOf(c))
case cookieTypeString2:
value.Set(reflect.ValueOf(c).Elem())
default:
if err = convertAssign(value, []string{c.Value}); err != nil {
return param.myError(err.Error())
}
}
} else if param.IsRequired() {
return param.myError("missing cookie param")
}
}
if err = param.validate(value); err != nil {
return err
}
}
return
}