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util.js
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util.js
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const http = require('http');
const qs = require('querystring');
const crypto = require('crypto');
const fs = require('fs');
const path = require('path');
const errors = require('./errors');
const LANG_C = 1;
const LANG_JAVA = 2;
const LANG_CPP = 3;
const LANG_PASCAL = 4;
const LANG_CPP11 = 5;
(function(obj){
obj.LANG_C = LANG_C;
obj.LANG_JAVA = LANG_JAVA;
obj.LANG_CPP = LANG_CPP;
obj.LANG_PASCAL = LANG_PASCAL;
obj.LANG_CPP11 = LANG_CPP11;
/**
* @param fileExt Lowercase file extension without the dot.
* @return LANG_* constant or -1 if unrecognized
*/
obj.getLang = function(fileExt){
switch (fileExt)
{
case 'c': return LANG_C;
case 'java': return LANG_JAVA;
case 'cc':
case 'cpp': return LANG_CPP11;
case 'p':
case 'pascal':
case 'pas': return LANG_PASCAL;
}
return -1;
};
obj.getLangName = function(lang){
lang = parseInt(lang);
switch(lang)
{
case LANG_C: return 'C';
case LANG_JAVA: return 'Java';
case LANG_CPP: return 'C++';
case LANG_PASCAL: return 'Pascal';
case LANG_CPP11: return 'C++11';
}
return '?';
};
/**
* @return File extension without the dot; empty string if none.
*/
obj.getFileExt = function(filePath){
var fileExt = path.extname(filePath);
if (fileExt)
return fileExt.substring(1);
return '';
};
obj.createEndCallback = function(callback){
var buf = '';
return function(inMsg){
inMsg.setEncoding('utf8');
inMsg.on('readable', function(){buf += inMsg.read() || '';})
.on('end', function(){callback(buf, inMsg);});
};
};
/**
* Removes surrounding quote chars (" or ') from a string.
* Any whitespace surrounded by the quote chars are preserved but
* whitespaces outside of the quote chars are removed. If no quote chars
* are present the entire string is trimmed of whitespaces.
* The string is processed adhering to the following rules:
* - the starting and ending quote chars must be the same.
* - if the starting or ending quote char is present, the other must also
* be present, that is, there must be no unmatched quote char.
* <pre>
* Examples:
* String s = " ' hello ' "; // unquote(s) returns "' hello '"
* String s = " 'hello "; // unquote(s) will throw an exception
* String s = " hello "; // unquote(s) returns "hello"
* </pre>
* @param s
* @exception if at least one
* of the rules is violated.
*/
obj.unquote = function(s){
s = s.trim();
if (s.length >= 1)
{
var start = s.charAt(0);
var end = s.length >= 2 ? s.charAt(s.length-1) : 0;
var isQuote =
(start === '"' || start === '\'' ||
end === '"' || end === '\'');
if (isQuote)
{
if (start === end)
return s.substring(1, s.length-1);
throw {message: "mismatched quote chars"};
}
}
return s;
};
/**
* Parses an HTML fragment containing attribute pairs without the
* tag name, in to a map.
* This is a forgiving parser that does not adhere strictly to XML rules,
* but well-formed XML are guaranteed to be parsed correctly.
* @param html This must be in the format: attrib1="value" attrib2="value"
* @return Map of attrib-value pairs. The names and values are NOT HTML
* decoded.
*/
obj.parseAttribs = function(html){
const ATTRIB_PATTERN =
// group 1: attrib name (allowing namespace)
// group 2: value including quote chars if any
/([\w:]+)\s*=\s*("[^"]*"|'[^']*'|\S*)/gi;
var match, pairs = {};
while (match = ATTRIB_PATTERN.exec(html))
{
pairs[match[1]] = obj.unquote(match[2]);
}
return pairs;
};
obj.getUserHomePath = function () {
var p = process.env[(process.platform == 'win32') ? 'USERPROFILE' : 'HOME'];
if (p) return p;
throw {message: "Cannot determine user home dir"};
};
obj.htmlDecodeSimple = function(s){
return s.replace(/'/g, '\'')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"')
.replace(/&/g, '&');
};
/**
* @param method GET or POST
* @param host domain name
* @param path Absolute path e.g. /index.html
* @param callback response callback function
*/
obj.createReq = function(method, host, path, callback){
// encodeURI leaves the path components alone
path = encodeURI(path);
var options = {
hostname: host,
path: path,
method: method,
// typical headers to disguise our identity
headers: {
'Referer': 'http://'+host+path,
'Accept-Charset': 'utf-8,ISO-8859-1',
// NOTE: chunked is implied if content-length is missing,
// explicitly putting it will confuse node.js which will leave
// the connection dangling
//'Transfer-Encoding': 'chunked',
// no gzip :(
//'Accept-Encoding': 'gzip,deflate',
'Accept-Language': 'en-US,en;q=0.8',
'User-Agent' : "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) "+
"AppleWebKit/537.17 (KHTML, like Gecko) "+
"Chrome/24.0.1312.57 Safari/537.17",
"Accept" : "text/html, application/xml, text/xml, */*"
}
};
return http.request(options, callback);
};
obj.writePostData = function(httpReq, data){
var qstr = qs.stringify(data);
httpReq.setHeader('Content-Type',
"application/x-www-form-urlencoded; charset=UTF-8");
httpReq.end(qstr, 'utf8');
};
obj.writeFormData = function(httpReq, data){
var boundBytes = crypto.pseudoRandomBytes(16);
var boundStr = (new Buffer(boundBytes)).toString('hex');
httpReq.setHeader('Content-Type',
'multipart/form-data; boundary='+boundStr);
var bufCap = 1<<16;
var buf = new Buffer(bufCap);
for (var key in data)
{
var val = data[key];
httpReq.write('--'+boundStr, 'ascii');
// file upload?
if (typeof val === 'object' && val.filePath)
{
httpReq.write("\r\nContent-Disposition: form-data; name=\""+ key +
"\"; filename=\""+val.filePath+"\"\r\n"+
"Content-Type: application/octet-stream\r\n"+
"Content-Transfer-Encoding: binary\r\n\r\n", "utf8");
var fd = fs.openSync(val.filePath, 'r');
var bufSize = 0;
while(true)
{
// read til buffer is full
while (bufSize < bufCap)
{
var nread = fs.readSync(fd, buf, bufSize, bufCap-bufSize, null);
if (nread == 0) break;
bufSize += nread;
}
if (bufSize === bufCap)
{
bufSize = 0;
httpReq.write(buf);
continue;
}
httpReq.write(buf.slice(0, bufSize));
break;
}
fs.closeSync(fd);
httpReq.write("\r\n", 'ascii');
}
else
{
httpReq.write("\r\nContent-Disposition: form-data; name=\""+ key +"\"\r\n\r\n", 'utf8');
httpReq.write(val+"\r\n", 'utf8');
}
}
httpReq.end('--'+boundStr+"--\r\n",'ascii');
};
/**
* Gets a semi-colon-separated list of cookies from the Set-Cookie headers,
* without the cookies' metadata such as expiry and path.
* The cookie keys and values are not decoded.
* @return null if the cookies are not found.
*/
obj.getCookies = function(inMsg){
var cookies = inMsg.headers["set-cookie"];
if (typeof cookies === 'string')
{
cookies = [cookies];
}
else if (!cookies)
return null;
function get(line)
{
var tokens = line.split(';');
// Cookie should be the first token
if (tokens.length >= 1)
{
var pair = tokens[0].split("=");
if (pair.length != 2) return null;
var key = pair[0].trim();
var value = pair[1].trim();
return {key: key, value: value};
}
return null;
}
var z = '';
var sep = '';
for (var i = 0; i < cookies.length; i++)
{
var cookie = get(cookies[i]);
if (!cookie) continue;
z += sep + cookie.key + '=' + cookie.value;
sep = '; ';
}
return z;
};
function skipWhitespace(s, startIdx)
{
for (var i = startIdx; i < s.length; i++)
{
var cur = s.charAt(i);
if (cur !== ' ' && cur !== "\t")
return i;
}
return -1;
}
obj.parseArgs = function(s){
var startQuote = null;
var args = [];
var curToken = '';
var i = skipWhitespace(s, 0);
if (i < 0) return args;
for (; i < s.length; )
{
var cur = s.charAt(i);
// inside a quoted arg?
if (startQuote)
{
if (cur === startQuote)
{
args.push(curToken.trim());
curToken = '';
startQuote = null;
i = skipWhitespace(s, i+1);
if (i < 0) return args;
}
else
{
curToken += cur;
i++;
}
}
else
{
if (cur == '"' || cur == "'")
{
curToken = curToken.trim();
if (curToken !== '')
{
args.push(curToken);
curToken = '';
}
startQuote = cur;
i++;
}
else if (cur == ' ' || cur == "\t")
{
args.push(curToken.trim());
curToken = '';
i = skipWhitespace(s, i+1);
if (i < 0) return args;
}
else
{
curToken += cur;
i++;
}
}
}
if (startQuote)
throw new errors.UnmatchedQuote();
if (curToken !== '')
args.push(curToken.trim());
return args;
};
/*
function check(s, args){
var args2 = obj.parseArgs(s);
if (args2.length != args.length)
{
console.log('Failed: '+s);
return;
}
for (var i=0; i < args2.length ;i++)
{
if (args2[i] != args[i])
{
console.log('Failed: '+s);
return;
}
}
}
check("", []);
check(" ", []);
check(" ", []);
check("a", ['a']);
check(" a", ['a']);
check("a ", ['a']);
check(" a ", ['a']);
check(" a ", ['a']);
check("'hello'", ['hello']);
check(" 'hello'", ['hello']);
check("'hello' ", ['hello']);
check(" 'hello' ", ['hello']);
check(" 'hello world' ", ['hello world']);
check("'hello'abc", ['hello','abc']);
check("'hello' abc", ['hello','abc']);
check("'hello' abc ", ['hello','abc']);
check("'hello world' abc", ['hello world','abc']);
check("'hello' 'hello there'", ['hello','hello there']);
check("hello 'hello there'", ['hello','hello there']);
check("'hello' \"\" 'hello there'", ['hello','','hello there']);
check("'hello'\"\"'hello there'", ['hello','','hello there']);
console.log('ok');
*/
})(module.exports);