{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "Checksums and other information for asserting the integrity of a data file.",
  "additionalProperties": false,
  "required": [
    "describedBy",
    "schema_type",
    "content_type",
    "size",
    "sha256",
    "crc32c",
    "file_id",
    "file_version",
    "file_name"
  ],
  "title": "File descriptor",
  "name": "file_descriptor",
  "type": "object",
  "properties": {
    "describedBy": {
      "description": "The URL reference to the schema.",
      "type": "string"
    },
    "schema_version": {
      "description": "The version number of the schema in major.minor.patch format.",
      "type": "string",
      "pattern": "^[0-9]{1,}\\.[0-9]{1,}\\.[0-9]{1,}$",
      "example": "4.6.1"
    },
    "schema_type": {
      "description": "The type of the metadata schema entity.",
      "type": "string",
      "enum": [
        "file_descriptor"
      ]
    },
    "file_name": {
      "description": "The object name of the data file relative to the staging area's `data/` directory",
      "type": "string",
      "user_friendly": "Staging file name",
      "example": "1b6d8348-d6e9-406a-aa6a-7ee886e52bf9/IDC9_L004_R2.fastq.gz"
    },
    "file_id": {
      "description": "UUID that uniquely identifies each data file in its source",
      "type": "string",
      "user_friendly": "File UUID",
      "example": "111f222a-333b-444c-555d-eee63ddfccc7",
      "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
    },
    "file_version": {
      "description": "The version of the file given in date time format",
      "type": "string",
      "user_friendly": "File version",
      "example": "2020-05-01T04:26:07.021870Z",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\\.[0-9]{6}Z$"
    },
    "content_type": {
      "description": "An appropriate MIME type for this file.",
      "type": "string",
      "user_friendly": "Content type",
      "example": "application/gzip"
    },
    "size": {
      "description": "The size of the file in bytes.",
      "type": "integer",
      "minimum": 0,
      "user_friendly": "Size",
      "example": 2147483648
    },
    "sha256": {
      "description": "The SHA-256 hash of the file.",
      "type": "string",
      "pattern": "^[a-f0-9]{64}$",
      "user_friendly": "SHA-256",
      "example": "12998c017066eb0d2a70b94e6ed3192985855ce390f321bbdb832022888bd251"
    },
    "crc32c": {
      "description": "The CRC-32C code generated for this file.",
      "type": "string",
      "pattern": "^[a-f0-9]{8}$",
      "user_friendly": "CRC32C",
      "example": "0b83b575"
    },
    "sha1": {
      "description": "The SHA-1 hash of the file.",
      "type": "string",
      "pattern": "^[a-f0-9]{40}$",
      "user_friendly": "SHA-1",
      "example": "6e71b3cac15d32fe2d36c270887df9479c25c640"
    },
    "s3_etag" : {
      "description": "An AWS S3 ETag of this file",
      "user_friendly": "S3 ETag",
      "type": "string",
      "example": "c92e5374ac0a53b228d4c1511c2d2842-63"
    },
    "drs_uri": {
      "description": "Data Repository Service URI pointing at this file. If this property is absent, a data file exists in the repository containing this descriptor. If this property is present and not `null`, a data file exists in another repository at the specified URI. If this property is present but `null`, the data file is not available, but will likely become available in the future, along with an updated descriptor referencing it.",
      "user_friendly": "DRS URI",
      "type": ["string", "null"],
      "format": "uri",
      "example": "drs://drs.example.org/314159"
    }
  }
}