/
blob.go
79 lines (66 loc) · 2.84 KB
/
blob.go
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package types
import (
"context"
"encoding/base64"
"fmt"
"github.com/cossacklabs/acra/decryptor/base"
"github.com/cossacklabs/acra/decryptor/base/type_awareness"
base_mysql "github.com/cossacklabs/acra/decryptor/mysql/base"
"github.com/cossacklabs/acra/encryptor/config/common"
"github.com/cossacklabs/acra/logging"
log "github.com/sirupsen/logrus"
)
// BlobDataTypeEncoder is encoder of TypeBlob in MySQL
type BlobDataTypeEncoder struct{}
// Encode implementation of Encode method of DataTypeEncoder interface for TypeBlob
func (t *BlobDataTypeEncoder) Encode(ctx context.Context, data []byte, format type_awareness.DataTypeFormat) (context.Context, []byte, error) {
if !base.IsDecryptedFromContext(ctx) {
ctx, value, err := t.EncodeOnFail(ctx, format)
if err != nil {
return ctx, nil, err
} else if value != nil {
return ctx, value, nil
}
return ctx, nil, base_mysql.ErrConvertToDataType
}
return ctx, base_mysql.PutLengthEncodedString(data), nil
}
// Decode implementation of Decode method of DataTypeEncoder interface for TypeBlob
func (t *BlobDataTypeEncoder) Decode(ctx context.Context, data []byte, format type_awareness.DataTypeFormat) (context.Context, []byte, error) {
return nil, nil, nil
}
// EncodeOnFail implementation of EncodeOnFail method of DataTypeEncoder interface for TypeBlob
func (t *BlobDataTypeEncoder) EncodeOnFail(ctx context.Context, format type_awareness.DataTypeFormat) (context.Context, []byte, error) {
action := format.GetResponseOnFail()
switch action {
case common.ResponseOnFailEmpty, common.ResponseOnFailCiphertext:
return ctx, nil, nil
case common.ResponseOnFailDefault:
strValue := format.GetDefaultDataValue()
if strValue == nil {
log.Errorln("Default value is not specified")
return ctx, nil, nil
}
return t.encodeDefault(ctx, []byte(*strValue), format)
case common.ResponseOnFailError:
return nil, nil, base.NewEncodingError(format.GetColumnName())
}
return ctx, nil, fmt.Errorf("unknown action: %q", action)
}
// EncodeDefault implementation of EncodeDefault method of DataTypeEncoder interface for TypeBlob
func (t *BlobDataTypeEncoder) encodeDefault(ctx context.Context, data []byte, format type_awareness.DataTypeFormat) (context.Context, []byte, error) {
binValue, err := base64.StdEncoding.DecodeString(string(data))
if err != nil {
logging.GetLoggerFromContext(ctx).WithError(err).Errorln("Can't decode base64 default value")
return ctx, nil, nil
}
return ctx, base_mysql.PutLengthEncodedString(binValue), nil
}
// ValidateDefaultValue implementation of ValidateDefaultValue method of DataTypeEncoder interface for TypeBlob
func (t *BlobDataTypeEncoder) ValidateDefaultValue(value *string) error {
_, err := base64.StdEncoding.DecodeString(*value)
return err
}
func init() {
type_awareness.RegisterMySQLDataTypeIDEncoder(uint32(base_mysql.TypeBlob), &BlobDataTypeEncoder{})
}