# all files / packages/web3-bzz/src/ index.js

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     /*
        This file is part of web3.js.

        web3.js is free software: you can redistribute it and/or modify
        it under the terms of the GNU Lesser General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        web3.js is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU Lesser General Public License for more details.

        You should have received a copy of the GNU Lesser General Public License
        along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
    */
    /**
     * @file index.js
     * @author Fabian Vogelsteller <fabian@ethereum.org>
     * @date 2017
     */

    "use strict";

    var _ = require('underscore');
    var swarm = require("swarm-js");

    var Bzz = function Bzz(provider) {

        this.givenProvider = Bzz.givenProvider;

        // if new Web3(provider), use the given provider
        Eif (provider && provider._requestManager) {
            provider = provider.currentProvider;
        }

        // only allow file picker when in browser
        Iif(typeof document !== 'undefined') {
            this.pick = swarm.pick;
        }

        this.setProvider(provider);
    };

    // set default ethereum provider
    /* jshint ignore:start */
    Bzz.givenProvider = null;
    Iif(typeof ethereumProvider !== 'undefined' && ethereumProvider.bzz) {
        Bzz.givenProvider = ethereumProvider;
    }
    /* jshint ignore:end */

    Bzz.prototype.setProvider = function(provider) {
        // is ethereum provider
        Iif(_.isObject(provider) && _.isString(provider.bzz)) {
            provider = provider.bzz;
        // is no string, set default
        } else if(!_.isString(provider)) {
            provider = 'http://swarm-gateways.net'; // default to gateway
        }

        Eif(_.isString(provider)) {
            this.currentProvider = provider;
        } else {
            return false;
        }

        // add functions
        this.download = swarm.at(provider).download;
        this.upload = swarm.at(provider).upload;
        this.isAvailable = swarm.at(provider).isAvailable;

        return true;
    };

    module.exports = Bzz;