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var EventEmitter = require('events').EventEmitter,
inherits = require('util').inherits;
var StreamSearch = require('streamsearch');
var B_DCRLF = Buffer.from('\r\n\r\n'),
RE_CRLF = /\r\n/g,
RE_HDR = /^([^:]+):[ \t]?([\x00-\xFF]+)?$/,
MAX_HEADER_PAIRS = 2000, // from node's http.js
MAX_HEADER_SIZE = 80 * 1024; // from node's http_parser
function HeaderParser(cfg) {
EventEmitter.call(this);
var self = this;
this.nread = 0;
this.maxed = false;
this.npairs = 0;
this.maxHeaderPairs = (cfg && typeof cfg.maxHeaderPairs === 'number'
? cfg.maxHeaderPairs
: MAX_HEADER_PAIRS);
this.buffer = '';
this.header = {};
this.finished = false;
this.ss = new StreamSearch(B_DCRLF);
this.ss.on('info', function(isMatch, data, start, end) {
if (data && !self.maxed) {
if (self.nread + (end - start) > MAX_HEADER_SIZE) {
end = (MAX_HEADER_SIZE - self.nread);
self.nread = MAX_HEADER_SIZE;
} else
self.nread += (end - start);
if (self.nread === MAX_HEADER_SIZE)
self.maxed = true;
self.buffer += data.toString('binary', start, end);
}
if (isMatch)
self._finish();
});
}
inherits(HeaderParser, EventEmitter);
HeaderParser.prototype.push = function(data) {
var r = this.ss.push(data);
if (this.finished)
return r;
};
HeaderParser.prototype.reset = function() {
this.finished = false;
this.buffer = '';
this.header = {};
this.ss.reset();
};
HeaderParser.prototype._finish = function() {
if (this.buffer)
this._parseHeader();
this.ss.matches = this.ss.maxMatches;
var header = this.header;
this.header = {};
this.buffer = '';
this.finished = true;
this.nread = this.npairs = 0;
this.maxed = false;
this.emit('header', header);
};
HeaderParser.prototype._parseHeader = function() {
if (this.npairs === this.maxHeaderPairs)
return;
var lines = this.buffer.split(RE_CRLF), len = lines.length, m, h,
modded = false;
for (var i = 0; i < len; ++i) {
if (lines[i].length === 0)
continue;
if (lines[i][0] === '\t' || lines[i][0] === ' ') {
// folded header content
// RFC2822 says to just remove the CRLF and not the whitespace following
// it, so we follow the RFC and include the leading whitespace ...
this.header[h][this.header[h].length - 1] += lines[i];
} else {
m = RE_HDR.exec(lines[i]);
if (m) {
h = m[1].toLowerCase();
if (m[2]) {
if (this.header[h] === undefined)
this.header[h] = [m[2]];
else
this.header[h].push(m[2]);
} else
this.header[h] = [''];
if (++this.npairs === this.maxHeaderPairs)
break;
} else {
this.buffer = lines[i];
modded = true;
break;
}
}
}
if (!modded)
this.buffer = '';
};
module.exports = HeaderParser;
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