embark-area-51/js/embark.js

/*jshint esversion: 6 */
//var Ipfs = require('./ipfs.js');

//=========================================================
// Embark Smart Contracts
//=========================================================

var EmbarkJS = {};

EmbarkJS.Contract = function(options) {
    var self = this;
    var i, abiElement;

    this.abi = options.abi;
    this.address = options.address;
    this.code = '0x' + options.code;
    this.web3 = options.web3 || web3;

    var ContractClass = this.web3.eth.contract(this.abi);

    this.eventList = [];

    if (this.abi) {
        for (i = 0; i < this.abi.length; i++) {
            abiElement = this.abi[i];
            if (abiElement.type === 'event') {
                this.eventList.push(abiElement.name);
            }
        }
    }

    var messageEvents = function() {
        this.cb = function() {};
    };

    messageEvents.prototype.then = function(cb) {
        this.cb = cb;
    };

    messageEvents.prototype.error = function(err) {
        return err;
    };

    this._originalContractObject = ContractClass.at(this.address);
    this._methods = Object.getOwnPropertyNames(this._originalContractObject).filter(function(p) {
        // TODO: check for forbidden properties
        if (self.eventList.indexOf(p) >= 0) {

            self[p] = function() {
                var promise = new messageEvents();
                var args = Array.prototype.slice.call(arguments);
                args.push(function(err, result) {
                    if (err) {
                        promise.error(err);
                    } else {
                        promise.cb(result);
                    }
                });

                self._originalContractObject[p].apply(self._originalContractObject[p], args);
                return promise;
            };
            return true;
        } else if (typeof self._originalContractObject[p] === 'function') {
            self[p] = function(_args) {
                var args = Array.prototype.slice.call(arguments);
                var fn = self._originalContractObject[p];
                var props = self.abi.find((x) => x.name == p);

                var promise = new Promise(function(resolve, reject) {
                    args.push(function(err, transaction) {
                        promise.tx = transaction;
                        if (err) {
                            return reject(err);
                        }

                        var getConfirmation = function() {
                            self.web3.eth.getTransactionReceipt(transaction, function(err, receipt) {
                                if (err) {
                                    return reject(err);
                                }

                                if (receipt !== null) {
                                    return resolve(receipt);
                                }

                                setTimeout(getConfirmation, 1000);
                            });
                        };

                        if (typeof(transaction) !== "string" || props.constant) {
                            resolve(transaction);
                        } else {
                            getConfirmation();
                        }
                    });

                    fn.apply(fn, args);
                });

                return promise;
            };
            return true;
        }
        return false;
    });
};

EmbarkJS.Contract.prototype.deploy = function(args, _options) {
    var self = this;
    var contractParams;
    var options = _options || {};

    contractParams = args || [];

    contractParams.push({
        from: this.web3.eth.accounts[0],
        data: this.code,
        gas: options.gas || 800000
    });

    var contractObject = this.web3.eth.contract(this.abi);

    var promise = new Promise(function(resolve, reject) {
        contractParams.push(function(err, transaction) {
            if (err) {
                reject(err);
            } else if (transaction.address !== undefined) {
                resolve(new EmbarkJS.Contract({
                    abi: self.abi,
                    code: self.code,
                    address: transaction.address
                }));
            }
        });

        // returns promise
        // deploys contract
        // wraps it around EmbarkJS.Contract
        contractObject["new"].apply(contractObject, contractParams);
    });


    return promise;
};

EmbarkJS.Contract.prototype.new = EmbarkJS.Contract.prototype.deploy;

EmbarkJS.Contract.prototype.at = function(address) {
  return new EmbarkJS.Contract({ abi: this.abi, code: this.code, address: address });
};

EmbarkJS.Contract.prototype.send = function(value, unit, _options) {
  var options, wei;
  if (typeof unit === 'object') {
    options = unit;
    wei = value;
  } else {
    options = _options || {};
    wei = this.web3.toWei(value, unit);
  }

  options.to = this.address;
  options.value = wei;
  console.log(options);

  this.web3.eth.sendTransaction(options);
};

//=========================================================
// Embark Storage
//=========================================================

EmbarkJS.Storage = {};

EmbarkJS.Storage.Providers = {
    IPFS: 'ipfs',
    SWARM: 'swarm'
};

EmbarkJS.Storage.IPFS = {};

EmbarkJS.Storage.saveText = function(text) {
    return this.currentStorage.saveText(text);
};

EmbarkJS.Storage.get = function(hash) {
    return this.currentStorage.get(hash);
};

EmbarkJS.Storage.uploadFile = function(inputSelector) {
    return this.currentStorage.uploadFile(inputSelector);
};

EmbarkJS.Storage.getUrl = function(hash) {
    return this.currentStorage.getUrl(hash);
};

EmbarkJS.Storage.setProvider = function(provider, options) {
    var self = this;
    var promise = new Promise(function(resolve, reject) {
        if (provider.toLowerCase() === EmbarkJS.Storage.Providers.IPFS) {
            //I don't think currentStorage is used anywhere, this might not be needed
            //for now until additional storage providers are supported. But keeping it
            //anyways
            self.currentStorage = EmbarkJS.Storage.IPFS;

            try {
                if (options === undefined) {
                    self.ipfsConnection = IpfsApi('localhost', '5001');
                } else {
                    self.ipfsConnection = IpfsApi(options.server, options.port);
                }
                resolve(self);
            } catch (err) {
                self.ipfsConnection = null;
                reject(new Error('Failed to connect to IPFS'));
            }
        } else if (provider.toLowerCase() === EmbarkJS.Storage.SWARM) {
            reject('Swarm not implemented');
            // TODO Implement Swarm
            // this.currentStorage = EmbarkJS.Storage.SWARM;
            // if (options === undefined) {
            //     //Connect to default Swarm node
            // } else {
            //     //Connect using options
            // }
        } else {
            reject('Unknown storage provider');
        }
    });
    return promise;
};

EmbarkJS.Storage.IPFS.saveText = function(text) {
    var promise = new Promise(function(resolve, reject) {
        if (!EmbarkJS.Storage.ipfsConnection) {
            var connectionError = new Error('No IPFS connection. Please ensure to call Embark.Storage.setProvider()');
            reject(connectionError);
        }
        EmbarkJS.Storage.ipfsConnection.add((new EmbarkJS.Storage.ipfsConnection.Buffer(text)), function(err, result) {
            if (err) {
                reject(err);
            } else {
                resolve(result[0].path);
            }
        });
    });

    return promise;
};

EmbarkJS.Storage.IPFS.get = function(hash) {
    // TODO: detect type, then convert if needed
    //var ipfsHash = web3.toAscii(hash);
    var promise = new Promise(function(resolve, reject) {
        if (!EmbarkJS.Storage.ipfsConnection) {
            var connectionError = new Error('No IPFS connection. Please ensure to call Embark.Storage.setProvider()');
            reject(connectionError);
        }
        EmbarkJS.Storage.ipfsConnection.object.get([hash]).then(function(node) {
            resolve(node.data);
        }).catch(function(err) {
            reject(err);
        });
    });

    return promise;
};

EmbarkJS.Storage.IPFS.uploadFile = function(inputSelector) {
    var file = inputSelector[0].files[0];

    if (file === undefined) {
        throw new Error('no file found');
    }

    var promise = new Promise(function(resolve, reject) {
        if (!EmbarkJS.Storage.ipfsConnection) {
            var connectionError = new Error('No IPFS connection. Please ensure to call Embark.Storage.setProvider()');
            reject(connectionError);
        }
        var reader = new FileReader();
        reader.onloadend = function() {
            var fileContent = reader.result;
            var buffer = EmbarkJS.Storage.ipfsConnection.Buffer.from(fileContent);
            EmbarkJS.Storage.ipfsConnection.add(buffer, function(err, result) {
                if (err) {
                    reject(err);
                } else {
                    resolve(result[0].path);
                }
            });
        };
        reader.readAsArrayBuffer(file);
    });

    return promise;
};

EmbarkJS.Storage.IPFS.getUrl = function(hash) {
    //var ipfsHash = web3.toAscii(hash);

    return 'http://localhost:8080/ipfs/' + hash;
};

//=========================================================
// Embark Messaging
//=========================================================

EmbarkJS.Messages = {};

EmbarkJS.Messages.setProvider = function(provider, options) {
    var self = this;
    var ipfs;
    if (provider === 'whisper') {
        this.currentMessages = EmbarkJS.Messages.Whisper;
        if (typeof variable === 'undefined' && typeof(web3) === 'undefined') {
            if (options === undefined) {
                web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
            } else {
                web3 = new Web3(new Web3.providers.HttpProvider("http://" + options.server + ':' + options.port));
            }
        }
        web3.version.getWhisper(function(err, res) {
            if (err) {
                console.log("whisper not available");
            } else if (web3.version.whisper >= 5) {
                console.log("this version of whisper is not supported yet; try a version of geth bellow 1.6.1");
            } else {
                self.currentMessages.identity = web3.shh.newIdentity();
            }
        });
    } else if (provider === 'orbit') {
        this.currentMessages = EmbarkJS.Messages.Orbit;
        if (options === undefined) {
            ipfs = HaadIpfsApi('localhost', '5001');
        } else {
            ipfs = HaadIpfsApi(options.host, options.port);
        }
        this.currentMessages.orbit = new Orbit(ipfs);
        if (typeof(web3) === "undefined") {
          this.currentMessages.orbit.connect(Math.random().toString(36).substring(2));
        } else {
          this.currentMessages.orbit.connect(web3.eth.accounts[0]);
        }
    } else {
        throw Error('Unknown message provider');
    }
};

EmbarkJS.Messages.sendMessage = function(options) {
    return this.currentMessages.sendMessage(options);
};

EmbarkJS.Messages.listenTo = function(options) {
    return this.currentMessages.listenTo(options);
};

EmbarkJS.Messages.Whisper = {};

EmbarkJS.Messages.Whisper.sendMessage = function(options) {
    var topics = options.topic || options.topics;
    var data = options.data || options.payload;
    var identity = options.identity || this.identity || web3.shh.newIdentity();
    var ttl = options.ttl || 100;
    var priority = options.priority || 1000;
    var _topics;

    if (topics === undefined) {
        throw new Error("missing option: topic");
    }

    if (data === undefined) {
        throw new Error("missing option: data");
    }

    // do fromAscii to each topics unless it's already a string
    if (typeof topics === 'string') {
        _topics = [web3.fromAscii(topics)];
    } else {
        // TODO: replace with es6 + babel;
        for (var i = 0; i < topics.length; i++) {
            _topics.push(web3.fromAscii(topics[i]));
        }
    }
    topics = _topics;

    var payload = JSON.stringify(data);

    var message = {
        from: identity,
        topics: topics,
        payload: web3.fromAscii(payload),
        ttl: ttl,
        priority: priority
    };

    return web3.shh.post(message, function() {});
};

EmbarkJS.Messages.Whisper.listenTo = function(options) {
    var topics = options.topic || options.topics;
    var _topics = [];

    if (typeof topics === 'string') {
        _topics = [topics];
    } else {
        // TODO: replace with es6 + babel;
        for (var i = 0; i < topics.length; i++) {
            _topics.push(topics[i]);
        }
    }
    topics = _topics;

    var filterOptions = {
        topics: topics
    };

    var messageEvents = function() {
        this.cb = function() {};
    };

    messageEvents.prototype.then = function(cb) {
        this.cb = cb;
    };

    messageEvents.prototype.error = function(err) {
        return err;
    };

    messageEvents.prototype.stop = function() {
        this.filter.stopWatching();
    };

    var promise = new messageEvents();

    var filter = web3.shh.filter(filterOptions, function(err, result) {
        var payload = JSON.parse(web3.toAscii(result.payload));
        var data;
        if (err) {
            promise.error(err);
        } else {
            data = {
                topic: topics,
                data: payload,
                from: result.from,
                time: (new Date(result.sent * 1000))
            };
            promise.cb(payload, data, result);
        }
    });

    promise.filter = filter;

    return promise;
};

EmbarkJS.Messages.Orbit = {};

EmbarkJS.Messages.Orbit.sendMessage = function(options) {
    var topics = options.topic || options.topics;
    var data = options.data || options.payload;

    if (topics === undefined) {
        throw new Error("missing option: topic");
    }

    if (data === undefined) {
        throw new Error("missing option: data");
    }

    if (typeof topics === 'string') {
        topics = topics;
    } else {
        // TODO: better to just send to different channels instead
        topics = topics.join(',');
    }

    this.orbit.join(topics);

    var payload = JSON.stringify(data);

    this.orbit.send(topics, data);
};

EmbarkJS.Messages.Orbit.listenTo = function(options) {
    var self = this;
    var topics = options.topic || options.topics;

    if (typeof topics === 'string') {
        topics = topics;
    } else {
        topics = topics.join(',');
    }

    this.orbit.join(topics);

    var messageEvents = function() {
        this.cb = function() {};
    };

    messageEvents.prototype.then = function(cb) {
        this.cb = cb;
    };

    messageEvents.prototype.error = function(err) {
        return err;
    };

    var promise = new messageEvents();

    this.orbit.events.on('message', (channel, message) => {
        // TODO: looks like sometimes it's receving messages from all topics
        if (topics !== channel) return;
        self.orbit.getPost(message.payload.value, true).then((post) => {
            var data = {
                topic: channel,
                data: post.content,
                from: post.meta.from.name,
                time: (new Date(post.meta.ts))
            };
            promise.cb(post.content, data, post);
        });
    });

    return promise;
};

module.exports = EmbarkJS;