mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-22 19:22:38 +01:00
341 lines
11 KiB
Go
341 lines
11 KiB
Go
package echo
|
|
|
|
import (
|
|
"encoding"
|
|
"encoding/xml"
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
"reflect"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
type (
|
|
// Binder is the interface that wraps the Bind method.
|
|
Binder interface {
|
|
Bind(i interface{}, c Context) error
|
|
}
|
|
|
|
// DefaultBinder is the default implementation of the Binder interface.
|
|
DefaultBinder struct{}
|
|
|
|
// BindUnmarshaler is the interface used to wrap the UnmarshalParam method.
|
|
// Types that don't implement this, but do implement encoding.TextUnmarshaler
|
|
// will use that interface instead.
|
|
BindUnmarshaler interface {
|
|
// UnmarshalParam decodes and assigns a value from an form or query param.
|
|
UnmarshalParam(param string) error
|
|
}
|
|
)
|
|
|
|
// BindPathParams binds path params to bindable object
|
|
func (b *DefaultBinder) BindPathParams(c Context, i interface{}) error {
|
|
names := c.ParamNames()
|
|
values := c.ParamValues()
|
|
params := map[string][]string{}
|
|
for i, name := range names {
|
|
params[name] = []string{values[i]}
|
|
}
|
|
if err := b.bindData(i, params, "param"); err != nil {
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// BindQueryParams binds query params to bindable object
|
|
func (b *DefaultBinder) BindQueryParams(c Context, i interface{}) error {
|
|
if err := b.bindData(i, c.QueryParams(), "query"); err != nil {
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// BindBody binds request body contents to bindable object
|
|
// NB: then binding forms take note that this implementation uses standard library form parsing
|
|
// which parses form data from BOTH URL and BODY if content type is not MIMEMultipartForm
|
|
// See non-MIMEMultipartForm: https://golang.org/pkg/net/http/#Request.ParseForm
|
|
// See MIMEMultipartForm: https://golang.org/pkg/net/http/#Request.ParseMultipartForm
|
|
func (b *DefaultBinder) BindBody(c Context, i interface{}) (err error) {
|
|
req := c.Request()
|
|
if req.ContentLength == 0 {
|
|
return
|
|
}
|
|
|
|
ctype := req.Header.Get(HeaderContentType)
|
|
switch {
|
|
case strings.HasPrefix(ctype, MIMEApplicationJSON):
|
|
if err = c.Echo().JSONSerializer.Deserialize(c, i); err != nil {
|
|
switch err.(type) {
|
|
case *HTTPError:
|
|
return err
|
|
default:
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
}
|
|
case strings.HasPrefix(ctype, MIMEApplicationXML), strings.HasPrefix(ctype, MIMETextXML):
|
|
if err = xml.NewDecoder(req.Body).Decode(i); err != nil {
|
|
if ute, ok := err.(*xml.UnsupportedTypeError); ok {
|
|
return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unsupported type error: type=%v, error=%v", ute.Type, ute.Error())).SetInternal(err)
|
|
} else if se, ok := err.(*xml.SyntaxError); ok {
|
|
return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Syntax error: line=%v, error=%v", se.Line, se.Error())).SetInternal(err)
|
|
}
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
case strings.HasPrefix(ctype, MIMEApplicationForm), strings.HasPrefix(ctype, MIMEMultipartForm):
|
|
params, err := c.FormParams()
|
|
if err != nil {
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
if err = b.bindData(i, params, "form"); err != nil {
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
default:
|
|
return ErrUnsupportedMediaType
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// BindHeaders binds HTTP headers to a bindable object
|
|
func (b *DefaultBinder) BindHeaders(c Context, i interface{}) error {
|
|
if err := b.bindData(i, c.Request().Header, "header"); err != nil {
|
|
return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Bind implements the `Binder#Bind` function.
|
|
// Binding is done in following order: 1) path params; 2) query params; 3) request body. Each step COULD override previous
|
|
// step binded values. For single source binding use their own methods BindBody, BindQueryParams, BindPathParams.
|
|
func (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {
|
|
if err := b.BindPathParams(c, i); err != nil {
|
|
return err
|
|
}
|
|
// Issue #1670 - Query params are binded only for GET/DELETE and NOT for usual request with body (POST/PUT/PATCH)
|
|
// Reasoning here is that parameters in query and bind destination struct could have UNEXPECTED matches and results due that.
|
|
// i.e. is `&id=1&lang=en` from URL same as `{"id":100,"lang":"de"}` request body and which one should have priority when binding.
|
|
// This HTTP method check restores pre v4.1.11 behavior and avoids different problems when query is mixed with body
|
|
if c.Request().Method == http.MethodGet || c.Request().Method == http.MethodDelete {
|
|
if err = b.BindQueryParams(c, i); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return b.BindBody(c, i)
|
|
}
|
|
|
|
// bindData will bind data ONLY fields in destination struct that have EXPLICIT tag
|
|
func (b *DefaultBinder) bindData(destination interface{}, data map[string][]string, tag string) error {
|
|
if destination == nil || len(data) == 0 {
|
|
return nil
|
|
}
|
|
typ := reflect.TypeOf(destination).Elem()
|
|
val := reflect.ValueOf(destination).Elem()
|
|
|
|
// Map
|
|
if typ.Kind() == reflect.Map {
|
|
for k, v := range data {
|
|
val.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(v[0]))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// !struct
|
|
if typ.Kind() != reflect.Struct {
|
|
if tag == "param" || tag == "query" || tag == "header" {
|
|
// incompatible type, data is probably to be found in the body
|
|
return nil
|
|
}
|
|
return errors.New("binding element must be a struct")
|
|
}
|
|
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
typeField := typ.Field(i)
|
|
structField := val.Field(i)
|
|
if typeField.Anonymous {
|
|
if structField.Kind() == reflect.Ptr {
|
|
structField = structField.Elem()
|
|
}
|
|
}
|
|
if !structField.CanSet() {
|
|
continue
|
|
}
|
|
structFieldKind := structField.Kind()
|
|
inputFieldName := typeField.Tag.Get(tag)
|
|
if typeField.Anonymous && structField.Kind() == reflect.Struct && inputFieldName != "" {
|
|
// if anonymous struct with query/param/form tags, report an error
|
|
return errors.New("query/param/form tags are not allowed with anonymous struct field")
|
|
}
|
|
|
|
if inputFieldName == "" {
|
|
// If tag is nil, we inspect if the field is a not BindUnmarshaler struct and try to bind data into it (might contains fields with tags).
|
|
// structs that implement BindUnmarshaler are binded only when they have explicit tag
|
|
if _, ok := structField.Addr().Interface().(BindUnmarshaler); !ok && structFieldKind == reflect.Struct {
|
|
if err := b.bindData(structField.Addr().Interface(), data, tag); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
// does not have explicit tag and is not an ordinary struct - so move to next field
|
|
continue
|
|
}
|
|
|
|
inputValue, exists := data[inputFieldName]
|
|
if !exists {
|
|
// Go json.Unmarshal supports case insensitive binding. However the
|
|
// url params are bound case sensitive which is inconsistent. To
|
|
// fix this we must check all of the map values in a
|
|
// case-insensitive search.
|
|
for k, v := range data {
|
|
if strings.EqualFold(k, inputFieldName) {
|
|
inputValue = v
|
|
exists = true
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
if !exists {
|
|
continue
|
|
}
|
|
|
|
// Call this first, in case we're dealing with an alias to an array type
|
|
if ok, err := unmarshalField(typeField.Type.Kind(), inputValue[0], structField); ok {
|
|
if err != nil {
|
|
return err
|
|
}
|
|
continue
|
|
}
|
|
|
|
numElems := len(inputValue)
|
|
if structFieldKind == reflect.Slice && numElems > 0 {
|
|
sliceOf := structField.Type().Elem().Kind()
|
|
slice := reflect.MakeSlice(structField.Type(), numElems, numElems)
|
|
for j := 0; j < numElems; j++ {
|
|
if err := setWithProperType(sliceOf, inputValue[j], slice.Index(j)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
val.Field(i).Set(slice)
|
|
} else if err := setWithProperType(typeField.Type.Kind(), inputValue[0], structField); err != nil {
|
|
return err
|
|
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func setWithProperType(valueKind reflect.Kind, val string, structField reflect.Value) error {
|
|
// But also call it here, in case we're dealing with an array of BindUnmarshalers
|
|
if ok, err := unmarshalField(valueKind, val, structField); ok {
|
|
return err
|
|
}
|
|
|
|
switch valueKind {
|
|
case reflect.Ptr:
|
|
return setWithProperType(structField.Elem().Kind(), val, structField.Elem())
|
|
case reflect.Int:
|
|
return setIntField(val, 0, structField)
|
|
case reflect.Int8:
|
|
return setIntField(val, 8, structField)
|
|
case reflect.Int16:
|
|
return setIntField(val, 16, structField)
|
|
case reflect.Int32:
|
|
return setIntField(val, 32, structField)
|
|
case reflect.Int64:
|
|
return setIntField(val, 64, structField)
|
|
case reflect.Uint:
|
|
return setUintField(val, 0, structField)
|
|
case reflect.Uint8:
|
|
return setUintField(val, 8, structField)
|
|
case reflect.Uint16:
|
|
return setUintField(val, 16, structField)
|
|
case reflect.Uint32:
|
|
return setUintField(val, 32, structField)
|
|
case reflect.Uint64:
|
|
return setUintField(val, 64, structField)
|
|
case reflect.Bool:
|
|
return setBoolField(val, structField)
|
|
case reflect.Float32:
|
|
return setFloatField(val, 32, structField)
|
|
case reflect.Float64:
|
|
return setFloatField(val, 64, structField)
|
|
case reflect.String:
|
|
structField.SetString(val)
|
|
default:
|
|
return errors.New("unknown type")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func unmarshalField(valueKind reflect.Kind, val string, field reflect.Value) (bool, error) {
|
|
switch valueKind {
|
|
case reflect.Ptr:
|
|
return unmarshalFieldPtr(val, field)
|
|
default:
|
|
return unmarshalFieldNonPtr(val, field)
|
|
}
|
|
}
|
|
|
|
func unmarshalFieldNonPtr(value string, field reflect.Value) (bool, error) {
|
|
fieldIValue := field.Addr().Interface()
|
|
if unmarshaler, ok := fieldIValue.(BindUnmarshaler); ok {
|
|
return true, unmarshaler.UnmarshalParam(value)
|
|
}
|
|
if unmarshaler, ok := fieldIValue.(encoding.TextUnmarshaler); ok {
|
|
return true, unmarshaler.UnmarshalText([]byte(value))
|
|
}
|
|
|
|
return false, nil
|
|
}
|
|
|
|
func unmarshalFieldPtr(value string, field reflect.Value) (bool, error) {
|
|
if field.IsNil() {
|
|
// Initialize the pointer to a nil value
|
|
field.Set(reflect.New(field.Type().Elem()))
|
|
}
|
|
return unmarshalFieldNonPtr(value, field.Elem())
|
|
}
|
|
|
|
func setIntField(value string, bitSize int, field reflect.Value) error {
|
|
if value == "" {
|
|
value = "0"
|
|
}
|
|
intVal, err := strconv.ParseInt(value, 10, bitSize)
|
|
if err == nil {
|
|
field.SetInt(intVal)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func setUintField(value string, bitSize int, field reflect.Value) error {
|
|
if value == "" {
|
|
value = "0"
|
|
}
|
|
uintVal, err := strconv.ParseUint(value, 10, bitSize)
|
|
if err == nil {
|
|
field.SetUint(uintVal)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func setBoolField(value string, field reflect.Value) error {
|
|
if value == "" {
|
|
value = "false"
|
|
}
|
|
boolVal, err := strconv.ParseBool(value)
|
|
if err == nil {
|
|
field.SetBool(boolVal)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func setFloatField(value string, bitSize int, field reflect.Value) error {
|
|
if value == "" {
|
|
value = "0.0"
|
|
}
|
|
floatVal, err := strconv.ParseFloat(value, bitSize)
|
|
if err == nil {
|
|
field.SetFloat(floatVal)
|
|
}
|
|
return err
|
|
}
|