rfc822-json
Version:
Parses an RFC-822 message stream (standard email) into JSON and returns a readable stream.
549 lines (517 loc) • 17.4 kB
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<div class="header high">
<h1>Code coverage report for <span class="entity">lib/message-parser.js</span></h1>
<h2>
Statements: <span class="metric">100% <small>(44 / 44)</small></span>
Branches: <span class="metric">100% <small>(10 / 10)</small></span>
Functions: <span class="metric">100% <small>(7 / 7)</small></span>
Lines: <span class="metric">100% <small>(44 / 44)</small></span>
</h2>
<div class="path"><a href="../index.html">All files</a> » <a href="index.html">lib/</a> » message-parser.js</div>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">var Stream = require('stream');
var util = require('util');
var HeaderParser = require(__dirname + '/header-parser');
var BodyParser = require(__dirname + '/body-parser');
// Creates a reusable parser which inherits from
// the Stream module.
function MessageParser() {
// Call the Stream.Transform constructor
Stream.Transform.call(this);
// Initialize state
this.message = {};
this.buffer = "";
this.headerBodyDelimiter = '\r\n\r\n';
this.hasFinishedHeaders = false;
this.hasEmittedMessage = false;
this.headerParser = new HeaderParser();
this.bodyParser = new BodyParser();
this.headerParser.on('headers', this.receiveHeaders.bind(this));
this.bodyParser.on('body', this.receiveBody.bind(this));
this.on('newListener', function(name, listener) {
if (name === 'message' && this.hasEmittedMessage) {
listener(this.message);
}
});
}
// Set up the inheritance
util.inherits(MessageParser, Stream.Transform);
// Implements the Stream.Transform._transform method.
MessageParser.prototype._transform = function(chunk, encoding, callback) {
var str = chunk.toString('binary');
this.buffer += str;
// Check for the double CRLF which delimits headers and body
var split = this.buffer.indexOf(this.headerBodyDelimiter);
if (split >= 0 && !this.hasFinishedHeaders) {
// Write all of the current buffer up to the delimiter point and
// close the header parser
this.headerParser.end(this.buffer.slice(0, split));
this.hasFinishedHeaders = true;
// Second half is the body
this.bodyParser.write(this.buffer.slice(split + this.headerBodyDelimiter.length));
} else if (this.hasFinishedHeaders) {
// If we've finished the headers, then the whole thing is part of
// the body.
this.bodyParser.write(str);
}
callback();
};
MessageParser.prototype._flush = function(callback) {
var _this = this;
this.bodyParser.end(function() {
_this.push(JSON.stringify(_this.message));
callback();
});
};
MessageParser.prototype.receiveHeaders = function(headers) {
this.message.headers = headers;
// Emit the headers
this.emit('headers', headers);
};
MessageParser.prototype.receiveBody = function(body) {
this.message.body = body;
// Emit the body
this.emit('body', body);
// Emit entire the parsed message (headers + body)
this.emit('message', this.message);
this.hasEmittedMessage = true;
};
module.exports = MessageParser;
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