{
  "$id": "https://schemas.mapi.dev/v1/objectmeta.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "description": "Metadata-only view of one object generation (what ``objects.get`` returns).\n\n``crc32c`` and ``md5_hash`` are computed by the storage service, never by the uploader.\n``md5_hash`` is absent for composite objects (GCS semantics).",
  "examples": [
    {
      "bucket": "mapi-local-runs",
      "content_type": "application/zip",
      "crc32c": "4waSgw==",
      "generation": 1760500000123456,
      "md5_hash": "XrY7u+Ae7tCTyyK7j1rNww==",
      "metadata": {},
      "metageneration": 1,
      "name": "t/default/runs/run_01jabc/a1/bundle.zarr.zip",
      "size": 1048576,
      "time_created": "2026-10-15T09:30:00Z"
    }
  ],
  "properties": {
    "bucket": {
      "pattern": "^[a-z0-9][a-z0-9_.\\-]{1,61}[a-z0-9]$",
      "title": "Bucket",
      "type": "string"
    },
    "content_type": {
      "anyOf": [
        {
          "maxLength": 256,
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "title": "Content Type"
    },
    "crc32c": {
      "description": "CRC32C as GCS reports it: base64 of the big-endian 4-byte checksum",
      "examples": [
        "4waSgw=="
      ],
      "pattern": "^[A-Za-z0-9+/]{6}==$",
      "title": "Crc32C",
      "type": "string"
    },
    "generation": {
      "minimum": 1,
      "title": "Generation",
      "type": "integer"
    },
    "md5_hash": {
      "anyOf": [
        {
          "description": "MD5 as GCS reports it: base64 of the 16-byte digest",
          "pattern": "^[A-Za-z0-9+/]{22}==$",
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "title": "Md5 Hash"
    },
    "metadata": {
      "additionalProperties": {
        "type": "string"
      },
      "maxProperties": 64,
      "title": "Metadata",
      "type": "object"
    },
    "metageneration": {
      "default": 1,
      "minimum": 1,
      "title": "Metageneration",
      "type": "integer"
    },
    "name": {
      "maxLength": 1024,
      "minLength": 1,
      "title": "Name",
      "type": "string"
    },
    "size": {
      "minimum": 0,
      "title": "Size",
      "type": "integer"
    },
    "time_created": {
      "format": "date-time",
      "title": "Time Created",
      "type": "string"
    }
  },
  "required": [
    "bucket",
    "name",
    "generation",
    "size",
    "crc32c",
    "time_created"
  ],
  "title": "ObjectMeta",
  "type": "object",
  "x-mapi-contract-version": "0.2"
}