main.js
2.37 KB
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var fs = require('fs'),
WritableStream = require('stream').Writable
|| require('readable-stream').Writable,
inherits = require('util').inherits;
var parseParams = require('./utils').parseParams;
function Busboy(opts) {
if (!(this instanceof Busboy))
return new Busboy(opts);
if (opts.highWaterMark !== undefined)
WritableStream.call(this, { highWaterMark: opts.highWaterMark });
else
WritableStream.call(this);
this._done = false;
this._parser = undefined;
this._finished = false;
this.opts = opts;
if (opts.headers && typeof opts.headers['content-type'] === 'string')
this.parseHeaders(opts.headers);
else
throw new Error('Missing Content-Type');
}
inherits(Busboy, WritableStream);
Busboy.prototype.emit = function(ev) {
if (ev === 'finish') {
if (!this._done) {
this._parser && this._parser.end();
return;
} else if (this._finished) {
return;
}
this._finished = true;
}
WritableStream.prototype.emit.apply(this, arguments);
};
Busboy.prototype.parseHeaders = function(headers) {
this._parser = undefined;
if (headers['content-type']) {
var parsed = parseParams(headers['content-type']),
matched, type;
for (var i = 0; i < TYPES.length; ++i) {
type = TYPES[i];
if (typeof type.detect === 'function')
matched = type.detect(parsed);
else
matched = type.detect.test(parsed[0]);
if (matched)
break;
}
if (matched) {
var cfg = {
limits: this.opts.limits,
headers: headers,
parsedConType: parsed,
highWaterMark: undefined,
fileHwm: undefined,
defCharset: undefined,
preservePath: false
};
if (this.opts.highWaterMark)
cfg.highWaterMark = this.opts.highWaterMark;
if (this.opts.fileHwm)
cfg.fileHwm = this.opts.fileHwm;
cfg.defCharset = this.opts.defCharset;
cfg.preservePath = this.opts.preservePath;
this._parser = type(this, cfg);
return;
}
}
throw new Error('Unsupported content type: ' + headers['content-type']);
};
Busboy.prototype._write = function(chunk, encoding, cb) {
if (!this._parser)
return cb(new Error('Not ready to parse. Missing Content-Type?'));
this._parser.write(chunk, cb);
};
var TYPES = [
require('./types/multipart'),
require('./types/urlencoded'),
];
module.exports = Busboy;