field_type.file.js
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field_type.file.js
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	var Sealious = require("../main.js");
	var Promise = require("bluebird");

	var FieldFileType = new Sealious.ChipTypes.FieldType({
	name: "file",
	handles_large_data: true,
	is_proper_value: function(accept, reject, context, params, value){
	if (value === undefined) {
	return undefined;
	}
	if ((value instanceof Sealious.File) \|\| (value.filename !== undefined && value.data instanceof Buffer)) {
	accept();
	} else {
	var type;
	if (value instanceof Array) {
	type = "<Array>. If you want to upload multiple files, use array field types.";
	} else {
	type = typeof data;
	}
	reject("Wrong file data format. Should be <Buffer>, but received " + type);
	}
	},
	encode: function(context, params, value_in_code){
	if (value_in_code) {
	return Sealious.Dispatcher.files.save_file(value_in_code);
	} else {
	return null;
	}
	},
	decode: function(context, params, value_in_database){
	if (value_in_database) {
	return Promise.resolve(new Sealious.File.Reference(value_in_database.id, value_in_database.filename));
	} else {
	if (params.no_file_value) {
	return params.no_file_value;
	} else {
	return undefined;
	}
	}
	}
	});