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Java SDK for Hyperledger fabric project
There is a newer version: 2.2.26
/*
Copyright IBM Corp. 2016 All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

                 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

syntax = "proto3";

import "google/protobuf/timestamp.proto";

option go_package = "github.com/hyperledger/fabric/protos/common";
option java_package = "org.hyperledger.fabric.protos.common";

package common;

// These status codes are intended to resemble selected HTTP status codes
enum Status {
    UNKNOWN = 0;
    SUCCESS = 200;
    BAD_REQUEST = 400;
    FORBIDDEN = 403;
    NOT_FOUND = 404;
    REQUEST_ENTITY_TOO_LARGE = 413;
    INTERNAL_SERVER_ERROR = 500;
    SERVICE_UNAVAILABLE = 503;
}

enum HeaderType {
    MESSAGE = 0;                   // Used for messages which are signed but opaque
    CONFIG = 1;                    // Used for messages which express the channel config
    CONFIG_UPDATE = 2;             // Used for transactions which update the channel config
    ENDORSER_TRANSACTION = 3;      // Used by the SDK to submit endorser based transactions
    ORDERER_TRANSACTION = 4;       // Used internally by the orderer for management
    DELIVER_SEEK_INFO = 5;         // Used as the type for Envelope messages submitted to instruct the Deliver API to seek
    CHAINCODE_PACKAGE = 6;         // Used for packaging chaincode artifacts for install
}

// This enum enlists indexes of the block metadata array
enum BlockMetadataIndex {
    SIGNATURES = 0;             // Block metadata array position for block signatures
    LAST_CONFIG = 1;            // Block metadata array position to store last configuration block sequence number
    TRANSACTIONS_FILTER = 2;    // Block metadata array position to store serialized bit array filter of invalid transactions
    ORDERER = 3;                // Block metadata array position to store operational metadata for orderers
                                // e.g. For Kafka, this is where we store the last offset written to the local ledger.
}

// LastConfig is the encoded value for the Metadata message which is encoded in the LAST_CONFIGURATION block metadata index
message LastConfig {
	uint64 index  = 1;
}

// Metadata is a common structure to be used to encode block metadata
message Metadata {
    bytes value = 1;
    repeated MetadataSignature signatures = 2;
}

message MetadataSignature {
    bytes signature_header = 1; // An encoded SignatureHeader
    bytes signature = 2;       // The signature over the concatenation of the Metadata value bytes, signatureHeader, and block header
}

message Header {
    bytes channel_header = 1;
    bytes signature_header = 2;
}

// Header is a generic replay prevention and identity message to include in a signed payload
message ChannelHeader {
    int32 type = 1; // Header types 0-10000 are reserved and defined by HeaderType

    // Version indicates message protocol version
    int32 version = 2;

    // Timestamp is the local time when the message was created
    // by the sender
    google.protobuf.Timestamp timestamp = 3;

    // Identifier of the channel this message is bound for
    string channel_id = 4;

    // An unique identifier that is used end-to-end.
    //  -  set by higher layers such as end user or SDK
    //  -  passed to the endorser (which will check for uniqueness)
    //  -  as the header is passed along unchanged, it will be
    //     be retrieved by the committer (uniqueness check here as well)
    //  -  to be stored in the ledger
    string tx_id = 5;

    // The epoch in which this header was generated, where epoch is defined based on block height
    // Epoch in which the response has been generated. This field identifies a
    // logical window of time. A proposal response is accepted by a peer only if
    // two conditions hold:
    // 1. the epoch specified in the message is the current epoch
    // 2. this message has been only seen once during this epoch (i.e. it hasn't
    //    been replayed)
    uint64 epoch = 6;

    // Extension that may be attached based on the header type
    bytes extension = 7;
}

message SignatureHeader {
    // Creator of the message, specified as a certificate chain
    bytes creator = 1;

    // Arbitrary number that may only be used once. Can be used to detect replay attacks.
    bytes nonce = 2;
}

// Payload is the message contents (and header to allow for signing)
message Payload {

    // Header is included to provide identity and prevent replay
    Header header = 1;

    // Data, the encoding of which is defined by the type in the header
    bytes data = 2;
}

// Envelope wraps a Payload with a signature so that the message may be authenticated
message Envelope {
    // A marshaled Payload
    bytes payload = 1;

    // A signature by the creator specified in the Payload header
    bytes signature = 2;
}

// This is finalized block structure to be shared among the orderer and peer
// Note that the BlockHeader chains to the previous BlockHeader, and the BlockData hash is embedded
// in the BlockHeader.  This makes it natural and obvious that the Data is included in the hash, but
// the Metadata is not.
message Block {
    BlockHeader header = 1;
    BlockData data = 2;
    BlockMetadata metadata = 3;
}

// BlockHeader is the element of the block which forms the block chain
// The block header is hashed using the configured chain hashing algorithm
// over the ASN.1 encoding of the BlockHeader
message BlockHeader {
    uint64 number = 1; // The position in the blockchain
    bytes previous_hash = 2; // The hash of the previous block header
    bytes data_hash = 3; // The hash of the BlockData, by MerkleTree
}

message BlockData {
    repeated bytes data = 1;
}

message BlockMetadata {
    repeated bytes metadata = 1;
}