58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
package protocol
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import (
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"errors"
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"fmt"
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"io"
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"github.com/russolsen/transit"
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)
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// NewMessageDecoder returns a new Transit decoder
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// that can deserialize Message structs.
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// More about Transit: https://github.com/cognitect/transit-format
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func NewMessageDecoder(r io.Reader) *transit.Decoder {
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decoder := transit.NewDecoder(r)
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decoder.AddHandler(pairMessageTag, pairMessageHandler)
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return decoder
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}
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const (
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pairMessageTag = "p2"
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)
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func pairMessageHandler(d transit.Decoder, value interface{}) (interface{}, error) {
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taggedValue, ok := value.(transit.TaggedValue)
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if !ok {
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return nil, errors.New("not a tagged value")
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}
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values, ok := taggedValue.Value.([]interface{})
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if !ok {
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return nil, errors.New("tagged value does not contain values")
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}
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pm := PairMessage{}
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for idx, v := range values {
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var ok bool
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switch idx {
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case 0:
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pm.InstallationID, ok = v.(string)
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case 1:
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pm.DeviceType, ok = v.(string)
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case 2:
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pm.Name, ok = v.(string)
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case 3:
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pm.FCMToken, ok = v.(string)
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default:
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// skip any other values
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ok = true
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}
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if !ok {
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return nil, fmt.Errorf("invalid value for index: %d", idx)
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}
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}
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return pm, nil
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}
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