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package protocol
import (
"encoding/base64"
"encoding/json"
"fmt"
"strconv"
"github.com/aws/aws-sdk-go/aws"
)
// EscapeMode is the mode that should be use for escaping a value
type EscapeMode uint
// The modes for escaping a value before it is marshaled, and unmarshaled.
const (
NoEscape EscapeMode = iota
Base64Escape
QuotedEscape
)
// EncodeJSONValue marshals the value into a JSON string, and optionally base64
// encodes the string before returning it.
//
// Will panic if the escape mode is unknown.
func EncodeJSONValue(v aws.JSONValue, escape EscapeMode) (string, error) {
b, err := json.Marshal(v)
if err != nil {
return "", err
}
switch escape {
case NoEscape:
return string(b), nil
case Base64Escape:
return base64.StdEncoding.EncodeToString(b), nil
case QuotedEscape:
return strconv.Quote(string(b)), nil
}
panic(fmt.Sprintf("EncodeJSONValue called with unknown EscapeMode, %v", escape))
}
// DecodeJSONValue will attempt to decode the string input as a JSONValue.
// Optionally decoding base64 the value first before JSON unmarshaling.
//
// Will panic if the escape mode is unknown.
func DecodeJSONValue(v string, escape EscapeMode) (aws.JSONValue, error) {
var b []byte
var err error
switch escape {
case NoEscape:
b = []byte(v)
case Base64Escape:
b, err = base64.StdEncoding.DecodeString(v)
case QuotedEscape:
var u string
u, err = strconv.Unquote(v)
b = []byte(u)
default:
panic(fmt.Sprintf("DecodeJSONValue called with unknown EscapeMode, %v", escape))
}
if err != nil {
return nil, err
}
m := aws.JSONValue{}
err = json.Unmarshal(b, &m)
if err != nil {
return nil, err
}
return m, nil
}
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