# Protocol Documentation ## Table of Contents - [service/meta.proto](#service/meta.proto) - Messages - [RequestMetaHeader](#service.RequestMetaHeader) - [ResponseMetaHeader](#service.ResponseMetaHeader) - [service/verify.proto](#service/verify.proto) - Messages - [RequestVerificationHeader](#service.RequestVerificationHeader) - [RequestVerificationHeader.Sign](#service.RequestVerificationHeader.Sign) - [RequestVerificationHeader.Signature](#service.RequestVerificationHeader.Signature) - [Scalar Value Types](#scalar-value-types)

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## service/meta.proto ### Message RequestMetaHeader RequestMetaHeader contains information about request meta headers (should be embedded into message) | Field | Type | Label | Description | | ----- | ---- | ----- | ----------- | | TTL | [uint32](#uint32) | | TTL must be larger than zero, it decreased in every NeoFS Node | | Epoch | [uint64](#uint64) | | Epoch for user can be empty, because node sets epoch to the actual value | | Version | [uint32](#uint32) | | Version defines protocol version TODO: not used for now, should be implemented in future | ### Message ResponseMetaHeader ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) | Field | Type | Label | Description | | ----- | ---- | ----- | ----------- | | Epoch | [uint64](#uint64) | | Current NeoFS epoch on server | | Version | [uint32](#uint32) | | Version defines protocol version TODO: not used for now, should be implemented in future |

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## service/verify.proto ### Message RequestVerificationHeader RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message). | Field | Type | Label | Description | | ----- | ---- | ----- | ----------- | | Signatures | [RequestVerificationHeader.Signature](#service.RequestVerificationHeader.Signature) | repeated | Signatures is a set of signatures of every passed NeoFS Node | ### Message RequestVerificationHeader.Sign | Field | Type | Label | Description | | ----- | ---- | ----- | ----------- | | Sign | [bytes](#bytes) | | Sign is signature of the request or session key. | | Peer | [bytes](#bytes) | | Peer is compressed public key used for signature. | ### Message RequestVerificationHeader.Signature | Field | Type | Label | Description | | ----- | ---- | ----- | ----------- | | Sign | [RequestVerificationHeader.Sign](#service.RequestVerificationHeader.Sign) | | Sign is a signature and public key of the request. | | Origin | [RequestVerificationHeader.Sign](#service.RequestVerificationHeader.Sign) | | Origin used for requests, when trusted node changes it and re-sign with session key. If session key used for signature request, then Origin should contain public key of user and signed session key. | ## Scalar Value Types | .proto Type | Notes | C++ Type | Java Type | Python Type | | ----------- | ----- | -------- | --------- | ----------- | | double | | double | double | float | | float | | float | float | float | | int32 | Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead. | int32 | int | int | | int64 | Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead. | int64 | long | int/long | | uint32 | Uses variable-length encoding. | uint32 | int | int/long | | uint64 | Uses variable-length encoding. | uint64 | long | int/long | | sint32 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s. | int32 | int | int | | sint64 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s. | int64 | long | int/long | | fixed32 | Always four bytes. More efficient than uint32 if values are often greater than 2^28. | uint32 | int | int | | fixed64 | Always eight bytes. More efficient than uint64 if values are often greater than 2^56. | uint64 | long | int/long | | sfixed32 | Always four bytes. | int32 | int | int | | sfixed64 | Always eight bytes. | int64 | long | int/long | | bool | | bool | boolean | boolean | | string | A string must always contain UTF-8 encoded or 7-bit ASCII text. | string | String | str/unicode | | bytes | May contain any arbitrary sequence of bytes. | string | ByteString | str |