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{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "http://nodeinfo.diaspora.software/ns/schema/2.1#",
  "description": "NodeInfo schema version 2.1.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "version",
    "software",
    "protocols",
    "services",
    "openRegistrations",
    "usage",
    "metadata"
  ],
  "properties": {
    "version": {
      "description": "The schema version, must be 2.1.",
      "enum": [
        "2.1"
      ]
    },
    "software": {
      "description": "Metadata about server software in use.",
      "type": "object",
      "additionalProperties": false,
      "required": [
        "name",
        "version"
      ],
      "properties": {
        "name": {
          "description": "The canonical name of this server software.",
          "type": "string",
          "pattern": "^[a-z0-9-]+$"
        },
        "version": {
          "description": "The version of this server software.",
          "type": "string"
        },
        "repository": {
          "description": "The url of the source code repository of this server software.",
          "type": "string"
        },
        "homepage": {
          "description": "The url of the homepage of this server software.",
          "type": "string"
        }
      }
    },
    "protocols": {
      "description": "The protocols supported on this server.",
      "type": "array",
      "minItems": 1,
      "items": {
        "enum": [
          "activitypub",
          "buddycloud",
          "dfrn",
          "diaspora",
          "libertree",
          "ostatus",
          "pumpio",
          "tent",
          "xmpp",
          "zot"
        ]
      }
    },
    "services": {
      "description": "The third party sites this server can connect to via their application API.",
      "type": "object",
      "additionalProperties": false,
      "required": [
        "inbound",
        "outbound"
      ],
      "properties": {
        "inbound": {
          "description": "The third party sites this server can retrieve messages from for combined display with regular traffic.",
          "type": "array",
          "minItems": 0,
          "items": {
            "enum": [
              "atom1.0",
              "gnusocial",
              "imap",
              "pnut",
              "pop3",
              "pumpio",
              "rss2.0",
              "twitter"
            ]
          }
        },
        "outbound": {
          "description": "The third party sites this server can publish messages to on the behalf of a user.",
          "type": "array",
          "minItems": 0,
          "items": {
            "enum": [
              "atom1.0",
              "blogger",
              "buddycloud",
              "diaspora",
              "dreamwidth",
              "drupal",
              "facebook",
              "friendica",
              "gnusocial",
              "google",
              "insanejournal",
              "libertree",
              "linkedin",
              "livejournal",
              "mediagoblin",
              "myspace",
              "pinterest",
              "pnut",
              "posterous",
              "pumpio",
              "redmatrix",
              "rss2.0",
              "smtp",
              "tent",
              "tumblr",
              "twitter",
              "wordpress",
              "xmpp"
            ]
          }
        }
      }
    },
    "openRegistrations": {
      "description": "Whether this server allows open self-registration.",
      "type": "boolean"
    },
    "usage": {
      "description": "Usage statistics for this server.",
      "type": "object",
      "additionalProperties": false,
      "required": [
        "users"
      ],
      "properties": {
        "users": {
          "description": "statistics about the users of this server.",
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "total": {
              "description": "The total amount of on this server registered users.",
              "type": "integer",
              "minimum": 0
            },
            "activeHalfyear": {
              "description": "The amount of users that signed in at least once in the last 180 days.",
              "type": "integer",
              "minimum": 0
            },
            "activeMonth": {
              "description": "The amount of users that signed in at least once in the last 30 days.",
              "type": "integer",
              "minimum": 0
            }
          }
        },
        "localPosts": {
          "description": "The amount of posts that were made by users that are registered on this server.",
          "type": "integer",
          "minimum": 0
        },
        "localComments": {
          "description": "The amount of comments that were made by users that are registered on this server.",
          "type": "integer",
          "minimum": 0
        }
      }
    },
    "metadata": {
      "description": "Free form key value pairs for software specific values. Clients should not rely on any specific key present.",
      "type": "object",
      "minProperties": 0,
      "additionalProperties": true
    }
  }
}