syntax = "proto3";

option go_package = "mfer";

import "google/protobuf/timestamp.proto";

message MFFile {
    enum Version {
        NONE = 0;
        ONE = 1; // only one for now
    }

    // required mffile root attributes 1xx
    Version version = 101;
    bytes innerMessage = 102;
    // these are used solely to detect corruption/truncation
    // and not for cryptographic integrity.
    uint64 size = 103;
    bytes sha256 = 104;

    // 2xx for optional manifest root attributes
    // think we might use gosignify instead of gpg:
    // github.com/frankbraun/gosignify

    //detached signature, ascii or binary
    optional bytes signature = 201;
    //full GPG key id
    optional bytes signer = 202;
    //full GPG signing public key, ascii or binary
    optional bytes signingPubKey = 203;
}

message MFFilePath {
    // required attributes:
    string path = 101;
    uint64 size = 102;

    // gotta have at least one:
    repeated MFFileChecksum hashes = 201;

    // optional per-file metadata
    optional string mimeType = 301;
    optional google.protobuf.Timestamp mtime = 302;
    optional google.protobuf.Timestamp ctime = 303;
    optional google.protobuf.Timestamp atime = 304;

}

message MFFileChecksum {
    // 1.0 golang implementation must write a multihash here
    // it's ok to only ever use/verify sha256 multihash
    bytes multiHash = 1;
}

message MFFileInner {
    enum Version {
        NONE = 0;
        ONE = 1; // only one for now
    }
    Version version = 101;

    // required manifest attributes:
    uint64 fileCount = 102;
    repeated MFFilePath files = 103;

    // optional manifest attributes 2xx:
    optional google.protobuf.Timestamp createdAt = 201;
}