status-react/resources/js/web3_init.js

if(typeof StatusHttpProvider === "undefined"){
var callbackId = 0;
var callbacks = {};

WebViewBridge.onMessage = function (message) {
    data = JSON.parse(message);

    if (data.type === "navigate-to-blank")
        window.location.href = "about:blank";

    else if (data.type === "status-api-success")
    {
        window.STATUS_API = data.data;
        window.postMessage({ type: 'STATUS_API_SUCCESS', permissions: data.keys }, "*");
    }

    else if (data.type === "web3-send-async-callback")
    {
        var id = data.messageId;
        if (callbacks[id]) {
            callbacks[id](data.error, data.result);
        }
    }
};

var StatusHttpProvider = function () {};

StatusHttpProvider.prototype.isStatus = true;
StatusHttpProvider.prototype.isConnected = function () { return true; };

function web3Response (payload, result){
    return {id: payload.id,
            jsonrpc: "2.0",
            result: result};
}

function getSyncResponse (payload) {
    if (payload.method == "eth_accounts"){
        return web3Response(payload, [currentAccountAddress])
    } else if (payload.method == "eth_coinbase"){
        return web3Response(payload, currentAccountAddress)
    } else if (payload.method == "net_version"){
        return web3Response(payload, networkId)
    } else if (payload.method == "eth_uninstallFilter"){
        return web3Response(payload, true);
    } else {
        return null;
    }
}

StatusHttpProvider.prototype.send = function (payload) {
    //TODO to be compatible with MM https://github.com/MetaMask/faq/blob/master/DEVELOPERS.md#dizzy-all-async---think-of-metamask-as-a-light-client
    if (payload.method == "eth_uninstallFilter"){
        this.sendAsync(payload, function (res, err) {})
    }
    var syncResponse = getSyncResponse(payload);
    if (syncResponse){
        return syncResponse;
    } else {
        alert('You tried to send "' + payload.method + '" synchronously. Synchronous requests are not supported, sorry.');
        return null;
    }
};

StatusHttpProvider.prototype.sendAsync = function (payload, callback) {
    var syncResponse = getSyncResponse(payload);
    if (syncResponse && callback){
        callback(null, syncResponse);
    }
    else {
        var messageId = callbackId++;
        callbacks[messageId] = callback;
        WebViewBridge.send(JSON.stringify({type:      'web3-send-async',
                                           messageId: messageId,
                                           payload:   payload}));
    }
};
}

var protocol = window.location.protocol
if (typeof web3 === "undefined") {
    //why do we need this condition?
    if (protocol == "https:" || protocol == "http:") {
        console.log("StatusHttpProvider");
        web3 = new Web3(new StatusHttpProvider());
        web3.eth.defaultAccount = currentAccountAddress; // currentAccountAddress - injected from status-react
    }
}