tenda 2012-09-08
我在Node中使用了PhoneGap Build API包。我将它上传到了: https://github.com/germallon/phonegapbuildapi,我认为这是一个很有趣的试验。 Build API是真的简单,所以我认为我的代码也将是非常简单的。
首先,我开始阅读它的API部分。它可以获取到应用程序,图标,下载的东西,等等。PhoneGap允许每次请求一个令牌或通过身份验证信息。于是,我通过简单地方式验证每个请求,并且让大部分的API逻辑都调用两个通用函数:
function getConfig(path) {
return {
auth: username + ":" + password,
host:"build.phonegap.com",
port:"443",
path:"/api/v1/"+path
}
}
//I handle doing the config get, http, string contact, etc
function doCall(path, success, fail) {
var options = getConfig(path);
var req = http.get(options, function(res) {
var resultString = "";
res.on("data", function(c) {
resultString+=c;
});
res.on("end",function() {
var result = JSON.parse(resultString);
success(result);
});
}).on("error", function(e) {
if(fail) fail(e);
});
}
这里doCall是核心函数,它解析API的路径。所有的API都调用相同的基URL,所以我让它更加简单,只需要加上path。Node中调用HTTP比CF要复杂一些,因为它们是异步的,但也并不困难。你可能会猜想这段代码里发生了什么。我打开一个请求,它会获得到一个结果对象。结果对象有一个数据事件。我将数据追加到一个结果变量。这里还有一个结束事件,在结束事件中我们可以用json解析结果变量,并发送成功的处理。
以下是一个获得所有应用程序的例子:
exports.getAllApps = function(success,fail) {
doCall("apps", function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res.apps);
},function(e) {
if(fail) fail(e);
});
最后,让Node应用程序使用它:
pgbuild = require("./pgbuild");
pgbuild.setUsername("[email protected]");
pgbuild.setPassword("isitmillertimeyet?");
//Test getting all the apps
pgbuild.getAllApps(function(apps) {
console.log("I got lots of apps! How many? "+apps.length);
//console.dir(apps);
}, function(e) {
console.log("Oh snap, an error");
console.dir(e);
});
我写的大部分代码都遵循API的这种格式 - 通过一个成功/失败的来处理程序。
所以我说这些都是非常简单的。我想我大概用了30分钟左右阅读API。然后我开始编写API时碰壁了。为什么?我想创建一个应用程序,允许你上传的文件并定义新应用程序。你也可以将新应用程序指定在一个存储库,但我想先做好文件版本。(打电话给我一个贪吃的朋友)证明上传文件在后面更加痛苦。没有真正内置的支持核心的Node.js库。谷歌搜索真的很困难,因为几乎所有的结果是关于如何处理文件上传,而不是文件上传请求。
经过我一番疯狂搜索,我发现这篇 文章。我在想这人的真正名字,但他(她)的关于页面实际上并没有说他(她)是谁。因此我决定这个人是……
……根据他(她)说的。我将他的一些逻辑写进了我最终的代码,虽然我对这种混合不是很满意,但是它确实很管用。下面是一个调用示例:
pgbuild.createApp({
title:"New App for Testing",
create_method:"file",
file:"./forupload/index.html"
}, function(res) {
console.log("Ok in making an app");
console.dir(res);
}, function(e) {
console.log("I got an error: ");
console.dir(e);
}
);
这是一个用PhoneGap新构建的网站。
有趣的是,浏览器使JavaScript上传文件比XHR2更加容易。如果你还没有看到这一动作,请查看优秀的 HTML5 Rocks这篇文章。
下面我将整个pgbuild.js代码贴出来:
var http = require("https");
var fs = require("fs");
var path = require("path");
var username = "";
var password = "";
exports.setUsername = function(u) { username = u; }
exports.setPassword = function(p) { password = p; }
exports.createApp = function(options, success, fail) {
var httpOptions = getConfig("apps");
httpOptions.method = "POST";
//Detect if options.create_method is file, and if so, suck in the bits
//Fails if no .file
//Also note it doesn't support .zip yet.
if(options.create_method === "file") {
if(!options.file) throw new Error("Must supply file value.");
console.log("Need to read in a file:"+options.file);
//Shell out for file uploads
PreparePost(httpOptions,JSON.stringify(options), options.file, success);
} else {
//TODO
}
}
exports.getAllApps = function(success,fail) {
doCall("apps", function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res.apps);
},function(e) {
if(fail) fail(e);
});
}
exports.getApp = function(id, success, fail) {
doCall("apps/"+id, function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res);
},function(e) {
if(fail) fail(e);
});
}
exports.getAppIcon = function(id, success, fail) {
doCall("apps/"+id +"/icon", function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res.location);
},function(e) {
if(fail) fail(e);
});
}
//todo: Possibly validate platform? Should be: Android,blackberry,ios,symbian,webos,winphone
exports.getAppDownload = function(id, platform, success, fail) {
doCall("apps/"+id +"/"+platform, function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res.location);
},function(e) {
if(fail) fail(e);
});
}
exports.getKeys = function() {
var platform = "";
if(arguments.length == 1) {
success = arguments[0];
} else if(arguments.length === 2) {
success = arguments[0];
fail = arguments[1];
} else if(arguments.length == 3) {
platform = arguments[0];
success = arguments[1];
fail = arguments[2];
}
var path = "keys";
if(platform != "") path+="/"+platform;
doCall(path, function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res.keys);
},function(e) {
if(fail) fail(e);
});
}
exports.getKey = function(platform, id, success, fail) {
doCall("keys/"+platform +"/"+id, function(res) {
if(res.error && res.error.length && fail) fail(res.error);
else success(res);
},function(e) {
if(fail) fail(e);
});
}
function getConfig(path) {
return {
auth: username + ":" + password,
host:"build.phonegap.com",
port:"443",
path:"/api/v1/"+path
}
}
//I handle doing the config get, http, string contact, etc
function doCall(path, success, fail) {
var options = getConfig(path);
var req = http.get(options, function(res) {
var resultString = "";
res.on("data", function(c) {
resultString+=c;
});
res.on("end",function() {
var result = JSON.parse(resultString);
success(result);
});
}).on("error", function(e) {
if(fail) fail(e);
});
}
//CREDIT: http://onteria.wordpress.com/2011/05/30/multipartform-data-uploads-using-node-js-and-http-request/
//Note that I modified his code quite a bit
//For file uploads
function EncodeFieldPart(boundary,name,value) {
var return_part = "--" + boundary + "\r\n";
return_part += "Content-Disposition: form-data; name=\"" + name + "\"\r\n\r\n";
return_part += value + "\r\n";
return return_part;
}
function EncodeFilePart(boundary,type,name,filename) {
var return_part = "--" + boundary + "\r\n";
return_part += "Content-Disposition: form-data; name=\"" + name + "\"; filename=\"" + filename + "\"\r\n";
return_part += "Content-Type: " + type + "\r\n\r\n";
return return_part;
}
//I expect the config options, the JSON data string, and file path
function PreparePost(httpOptions,data,file,success) {
var boundary = Math.random();
var post_data = [];
post_data.push(new Buffer(EncodeFieldPart(boundary, 'data', data), 'ascii'));
post_data.push(new Buffer(EncodeFilePart(boundary, 'text/plain', 'file', path.basename(file)), 'ascii'));
var contents = fs.readFileSync(file, "ascii");
post_data.push(new Buffer(contents, "utf8"));
post_data.push(new Buffer("\r\n--" + boundary + "--"), 'ascii');
MakePost(httpOptions,post_data, boundary,success);
}
function MakePost(httpOptions,post_data, boundary,success) {
var length = 0;
for(var i = 0; i < post_data.length; i++) {
length += post_data[i].length;
}
httpOptions.headers = {
'Content-Type' : 'multipart/form-data; boundary=' + boundary,
'Content-Length' : length
};
var post_request = http.request(httpOptions, function(response){
response.setEncoding('utf8');
var res="";
response.on('data', function(chunk){
res+=chunk;
});
response.on('end',function() {
success(JSON.parse(res));
});
});
for (var i = 0; i < post_data.length; i++) {
post_request.write(post_data[i]);
}
post_request.end();
}
英文原文 , OSChina翻译