go-ethereum/mist/assets/ext/html_messaging.js

// The magic return variable. The magic return variable will be set during the execution of the QML call.
(function(window) {
	function message(type, data) {
		document.title = JSON.stringify({type: type, data: data});

		return window.____returnData;
	}

	function isPromise(o) {
		return typeof o === "object" && o.then
	}

	window.eth = {
		_callbacks: {},
		_events: {},
		prototype: Object(),

		toHex: function(str) {
			var hex = "";
			for(var i = 0; i < str.length; i++) {
				var n = str.charCodeAt(i).toString(16);
				hex += n.length < 2 ? '0' + n : n;
			}

			return hex;
		},

		toAscii: function(hex) {
			// Find termination
			var str = "";
			var i = 0, l = hex.length;
			for(; i < l; i+=2) {
				var code = hex.charCodeAt(i)
				if(code == 0) {
					break;
				}

				str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
			}

			return str;
		},

		fromAscii: function(str, pad) {
			if(pad === undefined) {
				pad = 32
			}

			var hex = this.toHex(str);

			while(hex.length < pad*2)
				hex += "00";

			return hex
		},

		block: function(numberOrHash) {
			return new Promise(function(resolve, reject) {
				var func;
				if(typeof numberOrHash == "string") {
					func =  "getBlockByHash";
				} else {
					func =  "getBlockByNumber";
				}

				postData({call: func, args: [numberOrHash]}, function(block) {
					if(block)
						resolve(block);
					else
						reject("not found");

				});
			});
		},

		transact: function(params) {
			if(params === undefined) {
				params = {};
			}

			if(params.endowment !== undefined)
				params.value = params.endowment;
			if(params.code !== undefined)
				params.data = params.code;


			var promises = []
			if(isPromise(params.to)) {
				promises.push(params.to.then(function(_to) { params.to = _to; }));
			}
			if(isPromise(params.from)) {
				promises.push(params.from.then(function(_from) { params.from = _from; }));
			}

			if(isPromise(params.data)) {
				promises.push(params.data.then(function(_code) { params.data = _code; }));
			} else {
				if(typeof params.data === "object") {
					data = "";
					for(var i = 0; i < params.data.length; i++) {
						data += params.data[i]
					}
				} else {
					data = params.data;
				}
			}

			// Make sure everything is string
			var fields = ["value", "gas", "gasPrice"];
			for(var i = 0; i < fields.length; i++) {
				if(params[fields[i]] === undefined) {
					params[fields[i]] = "";
				}
				params[fields[i]] = params[fields[i]].toString();
			}

			// Load promises then call the last "transact".
			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "transact", args: params}, function(data) {
						if(data[1])
							reject(data[0]);
						else
							resolve(data[0]);
					});
				});
			})
		},

		compile: function(code) {
			return new Promise(function(resolve, reject) {
				postData({call: "compile", args: [code]}, function(data) {
					if(data[1])
						reject(data[0]);
					else
						resolve(data[0]);
				});
			});
		},

		balanceAt: function(address) {
			var promises = [];

			if(isPromise(address)) {
				promises.push(address.then(function(_address) { address = _address; }));
			}

			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "getBalanceAt", args: [address]}, function(balance) {
						resolve(balance);
					});
				});
			});
		},

		countAt: function(address) {
			var promises = [];

			if(isPromise(address)) {
				promises.push(address.then(function(_address) { address = _address; }));
			}

			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "getCountAt", args: [address]}, function(count) {
						resolve(count);
					});
				});
			});
		},

		codeAt: function(address) {
			var promises = [];

			if(isPromise(address)) {
				promises.push(address.then(function(_address) { address = _address; }));
			}

			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "getCodeAt", args: [address]}, function(code) {
						resolve(code);
					});
				});
			});
		},

		storageAt: function(address, storageAddress) {
			var promises = [];

			if(isPromise(address)) {
				promises.push(address.then(function(_address) { address = _address; }));
			}

			if(isPromise(storageAddress)) {
				promises.push(storageAddress.then(function(_sa) { storageAddress = _sa; }));
			}

			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "getStorageAt", args: [address, storageAddress]}, function(entry) {
						resolve(entry);
					});
				});
			});
		},

		stateAt: function(address, storageAddress) {
			return this.storageAt(address, storageAddress);
		},

		call: function(params) {
			if(params === undefined) {
				params = {};
			}

			if(params.endowment !== undefined)
				params.value = params.endowment;
			if(params.code !== undefined)
				params.data = params.code;


			var promises = []
			if(isPromise(params.to)) {
				promises.push(params.to.then(function(_to) { params.to = _to; }));
			}
			if(isPromise(params.from)) {
				promises.push(params.from.then(function(_from) { params.from = _from; }));
			}

			if(isPromise(params.data)) {
				promises.push(params.data.then(function(_code) { params.data = _code; }));
			} else {
				if(typeof params.data === "object") {
					data = "";
					for(var i = 0; i < params.data.length; i++) {
						data += params.data[i]
					}
				} else {
					data = params.data;
				}
			}

			// Make sure everything is string
			var fields = ["value", "gas", "gasPrice"];
			for(var i = 0; i < fields.length; i++) {
				if(params[fields[i]] === undefined) {
					params[fields[i]] = "";
				}
				params[fields[i]] = params[fields[i]].toString();
			}

			// Load promises then call the last "transact".
			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "call", args: params}, function(data) {
						if(data[1])
							reject(data[0]);
						else
							resolve(data[0]);
					});
				});
			})
		},

		watch: function(params) {
			return new Filter(params);
		},

		secretToAddress: function(key) {
			var promises = [];
			if(isPromise(key)) {
				promises.push(key.then(function(_key) { key = _key; }));
			}

			return Q.all(promises).then(function() {
				return new Promise(function(resolve, reject) {
					postData({call: "getSecretToAddress", args: [key]}, function(address) {
						resolve(address);
					});
				});
			});
		},

		on: function(event, cb) {
			if(eth._events[event] === undefined) {
				eth._events[event] = [];
			}

			eth._events[event].push(cb);

			return this
		},

		off: function(event, cb) {
			if(eth._events[event] !== undefined) {
				var callbacks = eth._events[event];
				for(var i = 0; i < callbacks.length; i++) {
					if(callbacks[i] === cb) {
						delete callbacks[i];
					}
				}
			}

			return this
		},

		trigger: function(event, data) {
			var callbacks = eth._events[event];
			if(callbacks !== undefined) {
				for(var i = 0; i < callbacks.length; i++) {
					// Figure out whether the returned data was an array
					// array means multiple return arguments (multiple params)
					if(data instanceof Array) {
						callbacks[i].apply(this, data);
					} else {
						callbacks[i].call(this, data);
					}
				}
			}
		},
	};

	// Eth object properties
	Object.defineProperty(eth, "key", {
		get: function() {
			return new Promise(function(resolve, reject) {
				postData({call: "getKey"}, function(k) {
					resolve(k);
				});
			});
		},
	});

	Object.defineProperty(eth, "gasPrice", {
		get: function() {
			return "1000000000000"
		}
	});

	Object.defineProperty(eth, "coinbase", {
		get: function() {
			return new Promise(function(resolve, reject) {
				postData({call: "getCoinBase"}, function(coinbase) {
					resolve(coinbase);
				});
			});
		},
	});

	Object.defineProperty(eth, "listening", {
		get: function() {
			return new Promise(function(resolve, reject) {
				postData({call: "getIsListening"}, function(listening) {
					resolve(listening);
				});
			});
		},
	});


	Object.defineProperty(eth, "mining", {
		get: function() {
			return new Promise(function(resolve, reject) {
				postData({call: "getIsMining"}, function(mining) {
					resolve(mining);
				});
			});
		},
	});

	Object.defineProperty(eth, "peerCount", {
		get: function() {
			return new Promise(function(resolve, reject) {
				postData({call: "getPeerCount"}, function(peerCount) {
					resolve(peerCount);
				});
			});
		},
	});

	var filters = [];
	var Filter = function(options) {
		filters.push(this);

		this.callbacks = [];
		this.options = options;

		var call;
		if(options === "chain") {
			call = "newFilterString"
		} else if(typeof options === "object") {
			call = "newFilter"
		}

		var self = this; // Cheaper than binding
		this.promise = new Promise(function(resolve, reject) {
			postData({call: call, args: [options]}, function(id) {
				self.id = id;

				resolve(id);
			});
		});
	};

	Filter.prototype.changed = function(callback) {
		var self = this;
		this.promise.then(function(id) {
			self.callbacks.push(callback);
		});
	};

	Filter.prototype.trigger = function(messages, id) {
		if(id == this.id) {
			for(var i = 0; i < this.callbacks.length; i++) {
				this.callbacks[i].call(this, messages);
			}
		}
	};

	Filter.prototype.uninstall = function() {
		this.promise.then(function(id) {
			postData({call: "uninstallFilter", args:[id]});
		});
	};

	Filter.prototype.messages = function() {
		var self=this;
		return Q.all([this.promise]).then(function() {
			var id = self.id
			return new Promise(function(resolve, reject) {
				postData({call: "getMessages", args: [id]}, function(messages) {
					resolve(messages);
				});
			});
		});
	};

	// Register to the messages callback. "messages" will be emitted when new messages
	// from the client have been created.
	eth.on("messages", function(messages, id) {
		for(var i = 0; i < filters.length; i++) {
			filters[i].trigger(messages, id);
		}
	});

	var g_seed = 1;
	function postData(data, cb) {
		data._seed = g_seed;
		if(cb) {
			eth._callbacks[data._seed] = cb;
		}

		if(data.args === undefined) {
			data.args = [];
		}

		g_seed++;

		navigator.qt.postMessage(JSON.stringify(data));
	}

	navigator.qt.onmessage = function(ev) {
		var data = JSON.parse(ev.data)

		if(data._event !== undefined) {
			eth.trigger(data._event, data.data);
		} else {
			if(data._seed) {
				var cb = eth._callbacks[data._seed];
				if(cb) {
					cb.call(this, data.data)

					// Remove the "trigger" callback
					delete eth._callbacks[ev._seed];
				}
			}
		}
	}
})(this);