{
  "$schema": "http://json-schema.org/draft-06/schema#",
  "type": "object",
  "oneOf": [
    { "$ref": "#/definitions/Audio" },
    { "$ref": "#/definitions/Image" },
    { "$ref": "#/definitions/Video" },
    { "$ref": "#/definitions/AudioMultiple" },
    { "$ref": "#/definitions/ImageMultiple" },
    { "$ref": "#/definitions/VideoMultiple" }
  ],
  "definitions": {
    "MediaBase": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string"
        },
        "name": {
          "type": "string",
          "description": "The alt text. Alternative textual description for accessibility or if the media fails to load.",
          "examples": ["A beautiful cow"]
        }
      },
      "required": ["type", "name"]
    },
    "MediaBaseSingle": {
      "type": "object",
      "allOf": [{ "$ref": "#/definitions/MediaBase" }],
      "properties": {
        "url": {
          "type": "string",
          "description": "URL the media can be downloaded from.",
          "examples": ["https://domain.example/image.jpg"]
        },
        "mediaType": {
          "type": "string",
          "description": "MIME type of the media attachment.",
          "examples": [
            "image/jpg",
            "image/png",
            "image/gif",
            "video/mp4",
            "audio/mp4"
          ]
        },
        "digestMultibase": {
          "type": "string",
          "description": "Multibase encoded digest, see https://www.multiformats.io/multihash/",
          "examples": ["zQmaeDPzhNL32WQZnnzB1H6QJWvvFNEHdViDB71yrxyXU1t"]
        },
        "size": {
          "type": "integer",
          "description": "Size in bytes of the media attachment.",
          "examples": [9045]
        }
      },
      "required": ["url", "mediaType", "digestMultibase", "size"]
    },
    "Image": {
      "allOf": [{ "$ref": "#/definitions/MediaBaseSingle" }],
      "properties": {
        "type": {
          "const": "Image"
        },
        "width": {
          "type": "integer",
          "description": "Width of the image in pixels",
          "examples": [800]
        },
        "height": {
          "type": "integer",
          "description": "Height of the image in pixels",
          "examples": [600]
        }
      },
      "required": ["width", "height"]
    },
    "Video": {
      "allOf": [{ "$ref": "#/definitions/MediaBaseSingle" }],
      "properties": {
        "type": {
          "const": "Video"
        },
        "width": {
          "type": "integer"
        },
        "height": {
          "type": "integer"
        },
        "duration": {
          "type": "string"
        }
      },
      "required": ["width", "height", "duration"]
    },
    "Audio": {
      "allOf": [{ "$ref": "#/definitions/MediaBaseSingle" }],
      "properties": {
        "type": {
          "const": "Audio"
        },
        "duration": {
          "type": "string"
        }
      },
      "required": ["duration"]
    },
    "LinkBase": {
      "type": "object",
      "properties": {
        "type": { "const": "Link" },
        "href": { "type": "string" },
        "size": { "type": "integer" },
        "digest": { "type": "string" },
        "mediaType": { "type": "string" }
      },
      "required": ["type", "href", "size", "digest", "mediaType"]
    },
    "VisualLink": {
      "allOf": [{ "$ref": "#/definitions/LinkBase" }],
      "properties": {
        "width": { "type": "integer" },
        "height": { "type": "integer" }
      },
      "required": ["width", "height"]
    },
    "VideoMultiple": {
      "allOf": [{ "$ref": "#/definitions/MediaBase" }],
      "properties": {
        "type": {
          "const": "Video"
        },
        "url": {
          "type": "array",
          "items": { "allOf": [{ "$ref": "#/definitions/VisualLink" }] }
        },
        "duration": {
          "type": "string"
        }
      },
      "required": ["url", "duration"]
    },
    "AudioMultiple": {
      "allOf": [{ "$ref": "#/definitions/MediaBase" }],
      "properties": {
        "type": {
          "const": "Audio"
        },
        "url": {
          "type": "array",
          "items": { "allOf": [{ "$ref": "#/definitions/LinkBase" }] }
        },
        "duration": {
          "type": "string"
        }
      },
      "required": ["url", "duration"]
    },
    "ImageMultiple": {
      "allOf": [{ "$ref": "#/definitions/MediaBase" }],
      "properties": {
        "type": {
          "const": "Image"
        },
        "url": {
          "type": "array",
          "items": { "allOf": [{ "$ref": "#/definitions/VisualLink" }] }
        }
      },
      "required": ["url"]
    }
  }
}