{
    "$schema": "https://json-schema.org/draft-04/schema#",
    "description": "A representation of packages metadata.",
    "type": "object",
    "oneOf": [
        { "required": [ "packages" ] },
        { "required": [ "providers" ] },
        { "required": [ "provider-includes", "providers-url" ] }
    ],
    "properties": {
        "packages": {
            "type": ["object", "array"],
            "description": "A hashmap of package names in the form of <vendor>/<name>.",
            "additionalProperties": { "$ref": "#/definitions/versions" }
        },
        "providers-url": {
            "type": "string",
            "description": "Endpoint to retrieve provider data from, e.g. '/p/%package%$%hash%.json'."
        },
        "provider-includes": {
            "type": "object",
            "description": "A hashmap of provider listings.",
            "additionalProperties": { "$ref": "#/definitions/provider" }
        },
        "providers": {
            "type": "object",
            "description": "A hashmap of package names in the form of <vendor>/<name>.",
            "additionalProperties": { "$ref": "#/definitions/provider" }
        },
        "notify-batch": {
            "type": "string",
            "description": "Endpoint to call after multiple packages have been installed, e.g. '/downloads/'."
        },
        "search": {
            "type": "string",
            "description": "Endpoint that provides search capabilities, e.g. '/search.json?q=%query%&type=%type%'."
        },
        "warning": {
            "type": "string",
            "description": "A message that will be output by Composer as a warning when this source is consulted."
        }
    },
    "definitions": {
        "versions": {
            "type": "object",
            "description": "A hashmap of versions and their metadata.",
            "additionalProperties": { "$ref": "#/definitions/version" }
        },
        "version": {
            "type": "object",
            "oneOf": [
                { "$ref": "#/definitions/package" },
                { "$ref": "#/definitions/metapackage" }
            ]
        },
        "package-base": {
            "properties": {
                "name": { "type": "string" },
                "type": { "type": "string" },
                "version": { "type": "string" },
                "version_normalized": {
                    "type": "string",
                    "description": "Normalized version, optional but can save computational time on client side."
                },
                "autoload": { "type": "object" },
                "require": { "type": "object" },
                "replace": { "type": "object" },
                "conflict": { "type": "object" },
                "provide": { "type": "object" },
                "time": { "type": "string" }
            },
            "additionalProperties": true
        },
        "package": {
            "allOf": [
                { "$ref": "#/definitions/package-base" },
                {
                    "properties": {
                        "dist": { "type": "object" },
                        "source": { "type": "object" }
                    }
                },
                { "oneOf": [
                    { "required": [ "name", "version", "source" ] },
                    { "required": [ "name", "version", "dist" ] }
                ] }
            ]
        },
        "metapackage": {
            "allOf": [
                { "$ref": "#/definitions/package-base" },
                {
                    "properties": {
                        "type": { "type": "string", "enum": [ "metapackage" ] }
                    },
                    "required": [ "name", "version", "type" ]
                }
            ]
        },
        "provider": {
            "type": "object",
            "properties": {
                "sha256": {
                    "type": "string",
                    "description": "Hash value that can be used to validate the resource."
                }
            }
        }
    }
}