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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| package arbnode | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "errors" | ||
|
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| espressoTypes "github.com/EspressoSystems/espresso-sequencer-go/types" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/offchainlabs/nitro/arbutil" | ||
| ) | ||
|
|
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| const MAX_ATTESTATION_QUOTE_SIZE int = 4 * 1024 | ||
| const LEN_SIZE int = 8 | ||
| const INDEX_SIZE int = 8 | ||
|
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| func buildRawHotShotPayload( | ||
| msgPositions []arbutil.MessageIndex, | ||
| msgFetcher func(arbutil.MessageIndex) ([]byte, error), | ||
| maxSize uint64, | ||
| ) ([]byte, int) { | ||
|
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| payload := []byte{} | ||
| msgCnt := 0 | ||
|
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| for _, p := range msgPositions { | ||
| msgBytes, err := msgFetcher(p) | ||
| if err != nil { | ||
| log.Warn("failed to fetch the message", "pos", p) | ||
| break | ||
| } | ||
|
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| sizeBuf := make([]byte, LEN_SIZE) | ||
| positionBuf := make([]byte, INDEX_SIZE) | ||
|
|
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| if len(payload)+len(sizeBuf)+len(msgBytes)+len(positionBuf)+MAX_ATTESTATION_QUOTE_SIZE > int(maxSize) { | ||
| break | ||
| } | ||
| binary.BigEndian.PutUint64(sizeBuf, uint64(len(msgBytes))) | ||
| binary.BigEndian.PutUint64(positionBuf, uint64(p)) | ||
|
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| // Add the submitted txn position and the size of the message along with the message | ||
| payload = append(payload, positionBuf...) | ||
| payload = append(payload, sizeBuf...) | ||
| payload = append(payload, msgBytes...) | ||
| msgCnt += 1 | ||
| } | ||
| return payload, msgCnt | ||
| } | ||
|
|
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| func signHotShotPayload( | ||
| unsigned []byte, | ||
| signer func([]byte) ([]byte, error), | ||
| ) ([]byte, error) { | ||
| quote, err := signer(unsigned) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| quoteSizeBuf := make([]byte, LEN_SIZE) | ||
| binary.BigEndian.PutUint64(quoteSizeBuf, uint64(len(quote))) | ||
| // Put the signature first. That would help easier parsing. | ||
| result := quoteSizeBuf | ||
| result = append(result, quote...) | ||
| result = append(result, unsigned...) | ||
|
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| return result, nil | ||
| } | ||
|
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| func validateIfPayloadIsInBlock(p []byte, payloads []espressoTypes.Bytes) bool { | ||
| validated := false | ||
| for _, payload := range payloads { | ||
| if bytes.Equal(p, payload) { | ||
| validated = true | ||
| break | ||
| } | ||
| } | ||
| return validated | ||
| } | ||
|
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| func ParseHotShotPayload(payload []byte) (signature []byte, indices []uint64, messages [][]byte, err error) { | ||
| if len(payload) < LEN_SIZE { | ||
| return nil, nil, nil, errors.New("payload too short to parse signature size") | ||
| } | ||
|
|
||
| // Extract the signature size | ||
| signatureSize := binary.BigEndian.Uint64(payload[:LEN_SIZE]) | ||
| currentPos := LEN_SIZE | ||
|
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| if len(payload[currentPos:]) < int(signatureSize) { | ||
| return nil, nil, nil, errors.New("payload too short for signature") | ||
| } | ||
|
|
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| // Extract the signature | ||
| signature = payload[currentPos : currentPos+int(signatureSize)] | ||
| currentPos += int(signatureSize) | ||
|
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| indices = []uint64{} | ||
| messages = [][]byte{} | ||
|
|
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| // Parse messages | ||
| for { | ||
| if currentPos == len(payload) { | ||
| break | ||
| } | ||
| if len(payload[currentPos:]) < LEN_SIZE+INDEX_SIZE { | ||
| return nil, nil, nil, errors.New("remaining bytes") | ||
| } | ||
|
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| // Extract the index | ||
| index := binary.BigEndian.Uint64(payload[currentPos : currentPos+INDEX_SIZE]) | ||
| currentPos += INDEX_SIZE | ||
|
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| // Extract the message size | ||
| messageSize := binary.BigEndian.Uint64(payload[currentPos : currentPos+LEN_SIZE]) | ||
| currentPos += LEN_SIZE | ||
|
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| if len(payload[currentPos:]) < int(messageSize) { | ||
| return nil, nil, nil, errors.New("message size mismatch") | ||
| } | ||
|
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| // Extract the message | ||
| message := payload[currentPos : currentPos+int(messageSize)] | ||
| currentPos += int(messageSize) | ||
|
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| indices = append(indices, index) | ||
| messages = append(messages, message) | ||
| } | ||
|
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| return signature, indices, messages, nil | ||
| } |
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