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var WritableStream = require('stream').Writable,
inherits = require('util').inherits;
var StreamSearch = require('streamsearch');
var PartStream = require('./PartStream'),
HeaderParser = require('./HeaderParser');
var DASH = 45,
B_ONEDASH = Buffer.from('-'),
B_CRLF = Buffer.from('\r\n'),
EMPTY_FN = function() {};
function Dicer(cfg) {
if (!(this instanceof Dicer))
return new Dicer(cfg);
WritableStream.call(this, cfg);
if (!cfg || (!cfg.headerFirst && typeof cfg.boundary !== 'string'))
throw new TypeError('Boundary required');
if (typeof cfg.boundary === 'string')
this.setBoundary(cfg.boundary);
else
this._bparser = undefined;
this._headerFirst = cfg.headerFirst;
var self = this;
this._dashes = 0;
this._parts = 0;
this._finished = false;
this._realFinish = false;
this._isPreamble = true;
this._justMatched = false;
this._firstWrite = true;
this._inHeader = true;
this._part = undefined;
this._cb = undefined;
this._ignoreData = false;
this._partOpts = (typeof cfg.partHwm === 'number'
? { highWaterMark: cfg.partHwm }
: {});
this._pause = false;
this._hparser = new HeaderParser(cfg);
this._hparser.on('header', function(header) {
self._inHeader = false;
self._part.emit('header', header);
});
}
inherits(Dicer, WritableStream);
Dicer.prototype.emit = function(ev) {
if (ev === 'finish' && !this._realFinish) {
if (!this._finished) {
var self = this;
process.nextTick(function() {
self.emit('error', new Error('Unexpected end of multipart data'));
if (self._part && !self._ignoreData) {
var type = (self._isPreamble ? 'Preamble' : 'Part');
self._part.emit('error', new Error(type + ' terminated early due to unexpected end of multipart data'));
self._part.push(null);
process.nextTick(function() {
self._realFinish = true;
self.emit('finish');
self._realFinish = false;
});
return;
}
self._realFinish = true;
self.emit('finish');
self._realFinish = false;
});
}
} else
WritableStream.prototype.emit.apply(this, arguments);
};
Dicer.prototype._write = function(data, encoding, cb) {
// ignore unexpected data (e.g. extra trailer data after finished)
if (!this._hparser && !this._bparser)
return cb();
if (this._headerFirst && this._isPreamble) {
if (!this._part) {
this._part = new PartStream(this._partOpts);
if (this._events.preamble)
this.emit('preamble', this._part);
else
this._ignore();
}
var r = this._hparser.push(data);
if (!this._inHeader && r !== undefined && r < data.length)
data = data.slice(r);
else
return cb();
}
// allows for "easier" testing
if (this._firstWrite) {
this._bparser.push(B_CRLF);
this._firstWrite = false;
}
this._bparser.push(data);
if (this._pause)
this._cb = cb;
else
cb();
};
Dicer.prototype.reset = function() {
this._part = undefined;
this._bparser = undefined;
this._hparser = undefined;
};
Dicer.prototype.setBoundary = function(boundary) {
var self = this;
this._bparser = new StreamSearch('\r\n--' + boundary);
this._bparser.on('info', function(isMatch, data, start, end) {
self._oninfo(isMatch, data, start, end);
});
};
Dicer.prototype._ignore = function() {
if (this._part && !this._ignoreData) {
this._ignoreData = true;
this._part.on('error', EMPTY_FN);
// we must perform some kind of read on the stream even though we are
// ignoring the data, otherwise node's Readable stream will not emit 'end'
// after pushing null to the stream
this._part.resume();
}
};
Dicer.prototype._oninfo = function(isMatch, data, start, end) {
var buf, self = this, i = 0, r, ev, shouldWriteMore = true;
if (!this._part && this._justMatched && data) {
while (this._dashes < 2 && (start + i) < end) {
if (data[start + i] === DASH) {
++i;
++this._dashes;
} else {
if (this._dashes)
buf = B_ONEDASH;
this._dashes = 0;
break;
}
}
if (this._dashes === 2) {
if ((start + i) < end && this._events.trailer)
this.emit('trailer', data.slice(start + i, end));
this.reset();
this._finished = true;
// no more parts will be added
if (self._parts === 0) {
self._realFinish = true;
self.emit('finish');
self._realFinish = false;
}
}
if (this._dashes)
return;
}
if (this._justMatched)
this._justMatched = false;
if (!this._part) {
this._part = new PartStream(this._partOpts);
this._part._read = function(n) {
self._unpause();
};
ev = this._isPreamble ? 'preamble' : 'part';
if (this._events[ev])
this.emit(ev, this._part);
else
this._ignore();
if (!this._isPreamble)
this._inHeader = true;
}
if (data && start < end && !this._ignoreData) {
if (this._isPreamble || !this._inHeader) {
if (buf)
shouldWriteMore = this._part.push(buf);
shouldWriteMore = this._part.push(data.slice(start, end));
if (!shouldWriteMore)
this._pause = true;
} else if (!this._isPreamble && this._inHeader) {
if (buf)
this._hparser.push(buf);
r = this._hparser.push(data.slice(start, end));
if (!this._inHeader && r !== undefined && r < end)
this._oninfo(false, data, start + r, end);
}
}
if (isMatch) {
this._hparser.reset();
if (this._isPreamble)
this._isPreamble = false;
else {
++this._parts;
this._part.on('end', function() {
if (--self._parts === 0) {
if (self._finished) {
self._realFinish = true;
self.emit('finish');
self._realFinish = false;
} else {
self._unpause();
}
}
});
}
this._part.push(null);
this._part = undefined;
this._ignoreData = false;
this._justMatched = true;
this._dashes = 0;
}
};
Dicer.prototype._unpause = function() {
if (!this._pause)
return;
this._pause = false;
if (this._cb) {
var cb = this._cb;
this._cb = undefined;
cb();
}
};
module.exports = Dicer;
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