# all files / packages/web3-core-requestManager/src/ givenProvider.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 givenProvider.js
     * @author Fabian Vogelsteller <fabian@ethereum.org>
     * @date 2017
     */

    "use strict";

    var givenProvider = null;

    // ADD GIVEN PROVIDER
    /* jshint ignore:start */
    var global = Function('return this')();

    // EthereumProvider
    Eif(typeof global.ethereumProvider !== 'undefined') {
        givenProvider = global.ethereumProvider;

    // Legacy web3.currentProvider
    } else if(typeof global.web3 !== 'undefined' && global.web3.currentProvider) {

        if(global.web3.currentProvider.sendAsync) {
            global.web3.currentProvider.send = global.web3.currentProvider.sendAsync;
            delete global.web3.currentProvider.sendAsync;
        }

        // if connection is 'ipcProviderWrapper', add subscription support
        if(!global.web3.currentProvider.on &&
            global.web3.currentProvider.connection &&
            global.web3.currentProvider.connection.constructor.name === 'ipcProviderWrapper') {

            global.web3.currentProvider.on = function (type, callback) {

                if(typeof callback !== 'function')
                    throw new Error('The second parameter callback must be a function.');

                switch(type){
                    case 'data':
                        this.connection.on('data', function(data) {
                            var result = '';

                            data = data.toString();

                            try {
                                result = JSON.parse(data);
                            } catch(e) {
                                return callback(new Error('Couldn\'t parse response data'+ data));
                            }

                            // notification
                            if(!result.id && result.method.indexOf('_subscription') !== -1) {
                                callback(null, result);
                            }

                        });
                        break;

                    default:
                        this.connection.on(type, callback);
                        break;
                }
            };
        }

        givenProvider = global.web3.currentProvider;
    }
    /* jshint ignore:end */

    module.exports = givenProvider;