New bindings for JSON, XML and form parsing and validation
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@ -3,32 +3,89 @@ package binding
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import (
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"encoding/json"
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"encoding/xml"
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"io"
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"errors"
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"net/http"
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"reflect"
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"strings"
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)
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type (
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Binding interface {
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Bind(io.Reader, interface{}) error
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Bind(*http.Request, interface{}) error
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}
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// JSON binding
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jsonBinding struct{}
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// JSON binding
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// XML binding
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xmlBinding struct{}
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// // form binding
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formBinding struct{}
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)
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var (
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JSON = jsonBinding{}
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XML = xmlBinding{}
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Form = formBinding{} // todo
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)
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func (_ jsonBinding) Bind(r io.Reader, obj interface{}) error {
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decoder := json.NewDecoder(r)
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return decoder.Decode(&obj)
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func (_ jsonBinding) Bind(req *http.Request, obj interface{}) error {
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decoder := json.NewDecoder(req.Body)
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if err := decoder.Decode(obj); err == nil {
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return Validate(obj)
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} else {
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return err
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}
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}
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func (_ xmlBinding) Bind(r io.Reader, obj interface{}) error {
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decoder := xml.NewDecoder(r)
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return decoder.Decode(&obj)
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func (_ xmlBinding) Bind(req *http.Request, obj interface{}) error {
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decoder := xml.NewDecoder(req.Body)
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if err := decoder.Decode(obj); err == nil {
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return Validate(obj)
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} else {
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return err
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}
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}
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func (_ formBinding) Bind(req *http.Request, obj interface{}) error {
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return nil
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}
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func Validate(obj interface{}) error {
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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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fieldValue := val.Field(i).Interface()
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zero := reflect.Zero(field.Type).Interface()
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// Validate nested and embedded structs (if pointer, only do so if not nil)
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if field.Type.Kind() == reflect.Struct ||
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(field.Type.Kind() == reflect.Ptr && !reflect.DeepEqual(zero, fieldValue)) {
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if err := Validate(fieldValue); err != nil {
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return err
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}
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}
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if strings.Index(field.Tag.Get("binding"), "required") > -1 {
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if reflect.DeepEqual(zero, fieldValue) {
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name := field.Name
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if j := field.Tag.Get("json"); j != "" {
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name = j
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} else if f := field.Tag.Get("form"); f != "" {
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name = f
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}
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return errors.New("Required " + name)
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}
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}
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}
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return nil
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}
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