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event_marshal.go
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event_marshal.go
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package cloudevents
import (
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
errors2 "github.com/pkg/errors"
"github.com/cloudevents/sdk-go/pkg/cloudevents/observability"
)
// MarshalJSON implements a custom json marshal method used when this type is
// marshaled using json.Marshal.
func (e Event) MarshalJSON() ([]byte, error) {
_, r := observability.NewReporter(context.Background(), eventJSONObserved{o: reportMarshal, v: e.SpecVersion()})
if err := e.Validate(); err != nil {
r.Error()
return nil, err
}
var b []byte
var err error
switch e.SpecVersion() {
case CloudEventsVersionV01, CloudEventsVersionV02, CloudEventsVersionV03:
b, err = JsonEncodeLegacy(e)
case CloudEventsVersionV1:
b, err = JsonEncode(e)
default:
return nil, fmt.Errorf("unnknown spec version: %q", e.SpecVersion())
}
// Report the observable
if err != nil {
r.Error()
return nil, err
} else {
r.OK()
}
return b, nil
}
// UnmarshalJSON implements the json unmarshal method used when this type is
// unmarshaled using json.Unmarshal.
func (e *Event) UnmarshalJSON(b []byte) error {
raw := make(map[string]json.RawMessage)
if err := json.Unmarshal(b, &raw); err != nil {
return err
}
version := versionFromRawMessage(raw)
_, r := observability.NewReporter(context.Background(), eventJSONObserved{o: reportUnmarshal, v: version})
var err error
switch version {
case CloudEventsVersionV01:
err = e.JsonDecodeV01(b, raw)
case CloudEventsVersionV02:
err = e.JsonDecodeV02(b, raw)
case CloudEventsVersionV03:
err = e.JsonDecodeV03(b, raw)
case CloudEventsVersionV1:
err = e.JsonDecodeV1(b, raw)
default:
return fmt.Errorf("unnknown spec version: %q", version)
}
// Report the observable
if err != nil {
r.Error()
return err
} else {
r.OK()
}
return nil
}
func versionFromRawMessage(raw map[string]json.RawMessage) string {
// v0.1
if v, ok := raw["cloudEventsVersion"]; ok {
var version string
if err := json.Unmarshal(v, &version); err != nil {
return ""
}
return version
}
// v0.2 and after
if v, ok := raw["specversion"]; ok {
var version string
if err := json.Unmarshal(v, &version); err != nil {
return ""
}
return version
}
return ""
}
// JsonEncode
func JsonEncode(e Event) ([]byte, error) {
data, err := e.DataBytes()
if err != nil {
return nil, err
}
return jsonEncode(e.Context, data, e.DataBinary)
}
// JsonEncodeLegacy
func JsonEncodeLegacy(e Event) ([]byte, error) {
var data []byte
isBase64 := e.Context.DeprecatedGetDataContentEncoding() == Base64
var err error
data, err = e.DataBytes()
if err != nil {
return nil, err
}
return jsonEncode(e.Context, data, isBase64)
}
func jsonEncode(ctx EventContextReader, data []byte, isBase64 bool) ([]byte, error) {
var b map[string]json.RawMessage
var err error
if ctx.GetSpecVersion() == CloudEventsVersionV01 {
b, err = marshalEventLegacy(ctx)
} else {
b, err = marshalEvent(ctx, ctx.GetExtensions())
}
if err != nil {
return nil, err
}
if data != nil {
// data is passed in as an encoded []byte. That slice might be any
// number of things but for json encoding of the envelope all we care
// is if the payload is either a string or a json object. If it is a
// json object, it can be inserted into the body without modification.
// Otherwise we need to quote it if not already quoted.
mediaType, err := ctx.GetDataMediaType()
if err != nil {
return nil, err
}
isJson := mediaType == "" || mediaType == ApplicationJSON || mediaType == TextJSON
// TODO(#60): we do not support json values at the moment, only objects and lists.
if isJson && !isBase64 {
b["data"] = data
} else {
var dataKey string
if ctx.GetSpecVersion() == CloudEventsVersionV1 {
dataKey = "data_base64"
buf := make([]byte, base64.StdEncoding.EncodedLen(len(data)))
base64.StdEncoding.Encode(buf, data)
data = buf
} else {
dataKey = "data"
}
if data[0] != byte('"') {
b[dataKey] = []byte(strconv.QuoteToASCII(string(data)))
} else {
// already quoted
b[dataKey] = data
}
}
}
body, err := json.Marshal(b)
if err != nil {
return nil, err
}
return body, nil
}
// JsonDecodeV01 takes in the byte representation of a version 0.1 structured json CloudEvent and returns a
// cloudevent.Event or an error if there are parsing errors.
func (e *Event) JsonDecodeV01(body []byte, raw map[string]json.RawMessage) error {
ec := EventContextV01{}
if err := json.Unmarshal(body, &ec); err != nil {
return err
}
var data interface{}
if d, ok := raw["data"]; ok {
data = []byte(d)
}
e.Context = &ec
e.Data = data
e.DataEncoded = data != nil
return nil
}
// JsonDecodeV02 takes in the byte representation of a version 0.2 structured json CloudEvent and returns a
// cloudevent.Event or an error if there are parsing errors.
func (e *Event) JsonDecodeV02(body []byte, raw map[string]json.RawMessage) error {
ec := EventContextV02{}
if err := json.Unmarshal(body, &ec); err != nil {
return err
}
// TODO: could use reflection to get these.
delete(raw, "specversion")
delete(raw, "type")
delete(raw, "source")
delete(raw, "id")
delete(raw, "time")
delete(raw, "schemaurl")
delete(raw, "contenttype")
var data interface{}
if d, ok := raw["data"]; ok {
data = []byte(d)
}
delete(raw, "data")
if len(raw) > 0 {
extensions := make(map[string]interface{}, len(raw))
ec.Extensions = extensions
for k, v := range raw {
k = strings.ToLower(k)
var tmp interface{}
if err := json.Unmarshal(v, &tmp); err != nil {
return err
}
if err := ec.SetExtension(k, tmp); err != nil {
return errors2.Wrap(err, "Cannot set extension with key "+k)
}
}
}
e.Context = &ec
e.Data = data
e.DataEncoded = data != nil
return nil
}
// JsonDecodeV03 takes in the byte representation of a version 0.3 structured json CloudEvent and returns a
// cloudevent.Event or an error if there are parsing errors.
func (e *Event) JsonDecodeV03(body []byte, raw map[string]json.RawMessage) error {
ec := EventContextV03{}
if err := json.Unmarshal(body, &ec); err != nil {
return err
}
// TODO: could use reflection to get these.
delete(raw, "specversion")
delete(raw, "type")
delete(raw, "source")
delete(raw, "subject")
delete(raw, "id")
delete(raw, "time")
delete(raw, "schemaurl")
delete(raw, "datacontenttype")
delete(raw, "datacontentencoding")
var data interface{}
if d, ok := raw["data"]; ok {
data = []byte(d)
}
delete(raw, "data")
if len(raw) > 0 {
extensions := make(map[string]interface{}, len(raw))
ec.Extensions = extensions
for k, v := range raw {
k = strings.ToLower(k)
var tmp interface{}
if err := json.Unmarshal(v, &tmp); err != nil {
return err
}
if err := ec.SetExtension(k, tmp); err != nil {
return errors2.Wrap(err, "Cannot set extension with key "+k)
}
}
}
e.Context = &ec
e.Data = data
e.DataEncoded = data != nil
return nil
}
// JsonDecodeV1 takes in the byte representation of a version 1.0 structured json CloudEvent and returns a
// cloudevent.Event or an error if there are parsing errors.
func (e *Event) JsonDecodeV1(body []byte, raw map[string]json.RawMessage) error {
ec := EventContextV1{}
if err := json.Unmarshal(body, &ec); err != nil {
return err
}
delete(raw, "specversion")
delete(raw, "type")
delete(raw, "source")
delete(raw, "subject")
delete(raw, "id")
delete(raw, "time")
delete(raw, "dataschema")
delete(raw, "datacontenttype")
var data interface{}
if d, ok := raw["data"]; ok {
data = []byte(d)
}
delete(raw, "data")
var dataBase64 []byte
if d, ok := raw["data_base64"]; ok {
var tmp []byte
if err := json.Unmarshal(d, &tmp); err != nil {
return err
}
dataBase64 = tmp
}
delete(raw, "data_base64")
if len(raw) > 0 {
extensions := make(map[string]interface{}, len(raw))
ec.Extensions = extensions
for k, v := range raw {
k = strings.ToLower(k)
var tmp interface{}
if err := json.Unmarshal(v, &tmp); err != nil {
return err
}
if err := ec.SetExtension(k, tmp); err != nil {
return errors2.Wrap(err, "Cannot set extension with key "+k)
}
}
}
e.Context = &ec
if data != nil && dataBase64 != nil {
return errors.New("parsing error: JSON decoder found both 'data', and 'data_base64' in JSON payload")
}
if data != nil {
e.Data = data
} else if dataBase64 != nil {
e.Data = dataBase64
}
e.DataEncoded = data != nil
return nil
}
func marshalEventLegacy(event interface{}) (map[string]json.RawMessage, error) {
b, err := json.Marshal(event)
if err != nil {
return nil, err
}
brm := map[string]json.RawMessage{}
if err := json.Unmarshal(b, &brm); err != nil {
return nil, err
}
return brm, nil
}
func marshalEvent(event interface{}, extensions map[string]interface{}) (map[string]json.RawMessage, error) {
b, err := json.Marshal(event)
if err != nil {
return nil, err
}
brm := map[string]json.RawMessage{}
if err := json.Unmarshal(b, &brm); err != nil {
return nil, err
}
for k, v := range extensions {
k = strings.ToLower(k)
vb, err := json.Marshal(v)
if err != nil {
return nil, err
}
// Don't overwrite spec keys.
if _, ok := brm[k]; !ok {
brm[k] = vb
}
}
return brm, nil
}