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encoder.go
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encoder.go
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package incentivisation
import (
"bytes"
"io"
"reflect"
"time"
"github.com/russolsen/transit"
)
type StatusMessageContent struct {
ChatID string
Text string
}
type StatusMessage struct {
Text string
ContentT string
MessageT string
Clock int64
Timestamp int64
Content StatusMessageContent
}
// CreateTextStatusMessage creates a StatusMessage.
func CreateTextStatusMessage(text string, chatID string) StatusMessage {
ts := time.Now().Unix() * 1000
return StatusMessage{
Text: text,
ContentT: "text/plain",
MessageT: "public-group-user-message",
Clock: ts * 100,
Timestamp: ts,
Content: StatusMessageContent{ChatID: chatID, Text: text},
}
}
func EncodeMessage(content string, chatID string) ([]byte, error) {
value := CreateTextStatusMessage(content, chatID)
var buf bytes.Buffer
encoder := NewMessageEncoder(&buf)
if err := encoder.Encode(value); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// NewMessageEncoder returns a new Transit encoder
// that can encode StatusMessage values.
// More about Transit: https://github.com/cognitect/transit-format
func NewMessageEncoder(w io.Writer) *transit.Encoder {
encoder := transit.NewEncoder(w, false)
encoder.AddHandler(statusMessageType, defaultStatusMessageValueEncoder)
return encoder
}
var (
statusMessageType = reflect.TypeOf(StatusMessage{})
defaultStatusMessageValueEncoder = &statusMessageValueEncoder{}
)
type statusMessageValueEncoder struct{}
func (statusMessageValueEncoder) IsStringable(reflect.Value) bool {
return false
}
func (statusMessageValueEncoder) Encode(e transit.Encoder, value reflect.Value, asString bool) error {
message := value.Interface().(StatusMessage)
taggedValue := transit.TaggedValue{
Tag: "c4",
Value: []interface{}{
message.Text,
message.ContentT,
transit.Keyword(message.MessageT),
message.Clock,
message.Timestamp,
map[interface{}]interface{}{
transit.Keyword("chat-id"): message.Content.ChatID,
transit.Keyword("text"): message.Content.Text,
},
},
}
return e.EncodeInterface(taggedValue, false)
}