角种子 web-script.js 和 cors

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【中文标题】角种子 web-script.js 和 cors【英文标题】:angular-seed web-script.js and cors 【发布时间】:2013-11-30 21:47:29 【问题描述】:

我已经累了第二天...我正在尝试从外部域获取一些 json,但我与 CORS 决裂了。我几乎可以肯定how to use JSONP in AngularJS resource,这个问题出在我的 node.js 服务器上,它没有发送

Origin: http://api.bob.com

所以,我阅读了无数 CORS 谷歌答案,但都说几乎一样:

var allowCrossDomain = function(req, res, next) 
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "X-Requested-With");
  next();
;

(...)

app.use(allowCrossDomain);

但是...在 scripts\web-script.js 中没有任何与 app 类似的东西,我可以将其用作 app。

下面的 web-script.js(它只是来自包)

#!/usr/bin/env node

var util = require('util'),
    http = require('http'),
    fs = require('fs'),
    url = require('url'),
    events = require('events');

var DEFAULT_PORT = 8000;

function main(argv) 
  new HttpServer(
    'GET': createServlet(StaticServlet),
    'HEAD': createServlet(StaticServlet)
  ).start(Number(argv[2]) || DEFAULT_PORT);


function escapehtml(value) 
  return value.toString().
    replace('<', '&lt;').
    replace('>', '&gt;').
    replace('"', '&quot;');


function createServlet(Class) 
  var servlet = new Class();
  return servlet.handleRequest.bind(servlet);


/**
 * An Http server implementation that uses a map of methods to decide
 * action routing.
 *
 * @param Object Map of method => Handler function
 */
function HttpServer(handlers) 
  this.handlers = handlers;
  this.server = http.createServer(this.handleRequest_.bind(this));


HttpServer.prototype.start = function(port) 
  this.port = port;
  this.server.listen(port);
  util.puts('Http Server running at http://localhost:' + port + '/');
;

HttpServer.prototype.parseUrl_ = function(urlString) 
  var parsed = url.parse(urlString);
  parsed.pathname = url.resolve('/', parsed.pathname);
  return url.parse(url.format(parsed), true);
;

HttpServer.prototype.handleRequest_ = function(req, res) 
  var logEntry = req.method + ' ' + req.url;
  if (req.headers['user-agent']) 
    logEntry += ' ' + req.headers['user-agent'];
  
  util.puts(logEntry);
  req.url = this.parseUrl_(req.url);
  var handler = this.handlers[req.method];
  if (!handler) 
    res.writeHead(501);
    res.end();
   else 
    handler.call(this, req, res);
  
;

/**
 * Handles static content.
 */
function StaticServlet() 

StaticServlet.MimeMap = 
  'txt': 'text/plain',
  'html': 'text/html',
  'css': 'text/css',
  'xml': 'application/xml',
  'json': 'application/json',
  'js': 'application/javascript',
  'jpg': 'image/jpeg',
  'jpeg': 'image/jpeg',
  'gif': 'image/gif',
  'png': 'image/png',
  'svg': 'image/svg+xml'
;

StaticServlet.prototype.handleRequest = function(req, res) 
  var self = this;
  var path = ('./' + req.url.pathname).replace('//','/').replace(/%(..)/g, function(match, hex)
    return String.fromCharCode(parseInt(hex, 16));
  );
  var parts = path.split('/');
  if (parts[parts.length-1].charAt(0) === '.')
    return self.sendForbidden_(req, res, path);
  fs.stat(path, function(err, stat) 
    if (err)
      return self.sendMissing_(req, res, path);
    if (stat.isDirectory())
      return self.sendDirectory_(req, res, path);
    return self.sendFile_(req, res, path);
  );


StaticServlet.prototype.sendError_ = function(req, res, error) 
  res.writeHead(500, 
      'Content-Type': 'text/html'
  );
  res.write('<!doctype html>\n');
  res.write('<title>Internal Server Error</title>\n');
  res.write('<h1>Internal Server Error</h1>');
  res.write('<pre>' + escapeHtml(util.inspect(error)) + '</pre>');
  util.puts('500 Internal Server Error');
  util.puts(util.inspect(error));
;

StaticServlet.prototype.sendMissing_ = function(req, res, path) 
  path = path.substring(1);
  res.writeHead(404, 
      'Content-Type': 'text/html'
  );
  res.write('<!doctype html>\n');
  res.write('<title>404 Not Found</title>\n');
  res.write('<h1>Not Found</h1>');
  res.write(
    '<p>The requested URL ' +
    escapeHtml(path) +
    ' was not found on this server.</p>'
  );
  res.end();
  util.puts('404 Not Found: ' + path);
;

StaticServlet.prototype.sendForbidden_ = function(req, res, path) 
  path = path.substring(1);
  res.writeHead(403, 
      'Content-Type': 'text/html'
  );
  res.write('<!doctype html>\n');
  res.write('<title>403 Forbidden</title>\n');
  res.write('<h1>Forbidden</h1>');
  res.write(
    '<p>You do not have permission to access ' +
    escapeHtml(path) + ' on this server.</p>'
  );
  res.end();
  util.puts('403 Forbidden: ' + path);
;

StaticServlet.prototype.sendRedirect_ = function(req, res, redirectUrl) 
  res.writeHead(301, 
      'Content-Type': 'text/html',
      'Location': redirectUrl
  );
  res.write('<!doctype html>\n');
  res.write('<title>301 Moved Permanently</title>\n');
  res.write('<h1>Moved Permanently</h1>');
  res.write(
    '<p>The document has moved <a href="' +
    redirectUrl +
    '">here</a>.</p>'
  );
  res.end();
  util.puts('301 Moved Permanently: ' + redirectUrl);
;

StaticServlet.prototype.sendFile_ = function(req, res, path) 
  var self = this;
  var file = fs.createReadStream(path);
  res.writeHead(200, 
    'Content-Type': StaticServlet.
      MimeMap[path.split('.').pop()] || 'text/plain'
  );
  if (req.method === 'HEAD') 
    res.end();
   else 
    file.on('data', res.write.bind(res));
    file.on('close', function() 
      res.end();
    );
    file.on('error', function(error) 
      self.sendError_(req, res, error);
    );
  
;

StaticServlet.prototype.sendDirectory_ = function(req, res, path) 
  var self = this;
  if (path.match(/[^\/]$/)) 
    req.url.pathname += '/';
    var redirectUrl = url.format(url.parse(url.format(req.url)));
    return self.sendRedirect_(req, res, redirectUrl);
  
  fs.readdir(path, function(err, files) 
    if (err)
      return self.sendError_(req, res, error);

    if (!files.length)
      return self.writeDirectoryIndex_(req, res, path, []);

    var remaining = files.length;
    files.forEach(function(fileName, index) 
      fs.stat(path + '/' + fileName, function(err, stat) 
        if (err)
          return self.sendError_(req, res, err);
        if (stat.isDirectory()) 
          files[index] = fileName + '/';
        
        if (!(--remaining))
          return self.writeDirectoryIndex_(req, res, path, files);
      );
    );
  );
;

StaticServlet.prototype.writeDirectoryIndex_ = function(req, res, path, files) 
  path = path.substring(1);
  res.writeHead(200, 
    'Content-Type': 'text/html'
  );
  if (req.method === 'HEAD') 
    res.end();
    return;
  
  res.write('<!doctype html>\n');
  res.write('<title>' + escapeHtml(path) + '</title>\n');
  res.write('<style>\n');
  res.write('  ol  list-style-type: none; font-size: 1.2em; \n');
  res.write('</style>\n');
  res.write('<h1>Directory: ' + escapeHtml(path) + '</h1>');
  res.write('<ol>');
  files.forEach(function(fileName) 
    if (fileName.charAt(0) !== '.') 
      res.write('<li><a href="' +
        escapeHtml(fileName) + '">' +
        escapeHtml(fileName) + '</a></li>');
    
  );
  res.write('</ol>');
  res.end();
;

// Must be last,
main(process.argv);

请帮助我 ***,你是我最后的希望。

【问题讨论】:

真的不清楚你想做什么。从另一个域获取数据? $http 或 ($resource) 不会使用 angular 获取它吗? 请看这里***.com/questions/20025711/… - 这是我的角码。当然我使用的 file.json 是 example.com/file.json 那个帖子很混乱....远程域是否提供 jsonp 服务? 我不确定这是一个示例:facebook.com/feeds/page.php?format=json&id=459908330791 - 但是当我将方法更改为 GET => 请求的资源上不存在“Access-Control-Allow-Origin”标头。 Origin 'localhost:8000' 因此不允许访问。 立即发现提要网址不再有效...查看响应。当然,他们有一个 API,您可以访问您想要的服务 jsonp 或启用 CORS 的 API 【参考方案1】:

你有类似的东西: https://github.com/angular/angular-seed/blob/master/scripts/web-server.js

所以你必须在响应头中添加 ALLOW CORS(看下面我添加了 2 行):

StaticServlet.prototype.sendFile_ = function(req, res, path) 
  var self = this;
  var file = fs.createReadStream(path);
  res.writeHead(200, 
    'Content-Type': StaticServlet.
      MimeMap[path.split('.').pop()] || 'text/plain',
    // ALLOW CORS - line 1 !!!
    'Access-Control-Allow-Origin' : '*',
    // ALLOW CORS - line 2 !!!
    'Access-Control-Allow-Headers': 'X-Requested-With'
  );
  if (req.method === 'HEAD') 
    res.end();
   else 
    file.on('data', res.write.bind(res));
    file.on('close', function() 
      res.end();
    );
    file.on('error', function(error) 
      self.sendError_(req, res, error);
    );
  
;

也许你有 jsonp 的其他功能,所以也添加到res.writeHead(200, CORS 标头。

【讨论】:

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