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render.js
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render.js
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var common = require('common');
var fs = require('fs');
var path = require('path');
var mime = require('mime');
var ghm = require('github-flavored-markdown');
var lesslib = require('less');
var mudlib = require('mud');
var rendermarkdown = function(filename, callback) {
common.step([
function(next) {
fs.readFile(filename, 'utf-8', next);
},
function(result) {
callback(null, ghm.parse(result));
}
], callback);
};
var renderless = function(filename, callback) {
common.step([
function(next) {
fs.readFile(filename, 'utf-8', next);
},
function(result, next) {
lesslib.render(result, next);
},
function(css) {
callback(null, css);
}
], callback);
};
var rendermud = function(filename, callback) {
mudlib.resolve(filename, {inline:true}, callback);
};
var aejs = require('async-ejs')
.add('markdown',rendermarkdown)
.add('less', renderless)
.add('mud', rendermud);
var template = function(template, locals) {
var getOptions = typeof locals === 'function' ? locals : function(params, callback) {
for(var i in locals) {
params[i] = params[i] || locals[i];
}
callback(null, params);
};
return function(request, response) {
common.step([
function(next) {
getOptions(request.params || {}, next);
},
function(locals, next) {
aejs.renderFile(template, {locals: locals}, next);
},
function(src) {
response.writeHead(200, {
'content-type': 'text/html',
'content-length': Buffer.byteLength(src)
});
response.end(src);
}
], function(err) {
response.writeHead(500);
response.end(err.stack);
});
}
};
exports.template = template;
var render = function(fn, location, options) {
return function(request, response) {
common.step([
function(next) {
var url = common.format(location, request.params);
fn(url, next);
},
function(result, next) {
var headers = {
'content-type':options.contentType,
'content-length':Buffer.byteLength(result),
};
if (options.cacheMaxAge !== undefined) {
headers['cache-control'] = 'public, max-age=' + options.cacheMaxAge;
}
response.writeHead(options.status, headers);
response.end(result);
}
], function(err) {
if(err.errno in {9:1,2:1}) {
response.writeHead(404);
} else {
response.writeHead(500);
}
response.end();
});
};
};
var mud = function(location, options) {
options = options || {};
options.status = options.status || 200;
options.contentType = 'application/javascript';
return render(rendermud, location, options);
};
exports.mud = mud;
var markdown = function(location, options) {
options = options || {};
options.status = options.status || 200;
options.contentType = 'text/html';
return render(rendermarkdown, location, options);
};
exports.markdown = markdown;
var less = function(location, options) {
options = options || {};
options.status = options.status || 200;
options.contentType = 'text/css';
return render(renderless, location, options);
};
exports.less = less;
var file = function(location, options) {
options = options || {};
options.status = options.status || 200;
return function(request, response) {
var url = common.format(location, request.params);
var onnotfound = function() {
response.writeHead(404);
response.end();
};
if (/\/\.\.\//.test(url)) { // security check
onnotfound();
return;
}
fs.stat(url, common.fork(onnotfound, function(stat) {
var headers = {
'content-type':mime.lookup(url),
'content-length':stat.size,
'date':new Date().toUTCString(),
'last-modified':stat.mtime.toUTCString()
};
if (options.cacheMaxAge !== undefined) {
headers['cache-control'] = 'public, max-age=' + options.cacheMaxAge;
}
response.writeHead(options.status, headers);
fs.createReadStream(url).pipe(response);
}));
};
};
exports.file = file;