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var crypto = require('crypto');
var onHeaders = require('on-headers');
var Factory = function (options) {
return createMiddleware(options);
};
Factory.Cache = require('./cache.js');
Factory.Minifier = require('./minifier.js');
module.exports = Factory;
var createMiddleware = function express_minify(options) {
options = options || {};
var js_match = options.js_match || /javascript/;
var css_match = options.css_match || /css/;
var sass_match = options.sass_match || /scss/;
var less_match = options.less_match || /less/;
var stylus_match = options.stylus_match || /stylus/;
var coffee_match = options.coffee_match || /coffeescript/;
var json_match = options.json_match || /json/;
var cache = new Factory.Cache(options.cache || false);
var minifier = new Factory.Minifier(options.uglifyJS, options.cssmin, options.onerror);
return function express_minify_middleware(req, res, next) {
var write = res.write;
var end = res.end;
var buf = null;
var type = Factory.Minifier.TYPE_TEXT;
onHeaders(res, function () {
if (req.method === 'HEAD') {
return;
}
if (res._skip) {
return;
}
var contentType = res.getHeader('Content-Type');
if (contentType === undefined) {
return;
}
// for sass, less, stylus, coffee module:
// null: module is found but not loaded
// false: module not found
// so we should not process false values, but allow null values
if (minifier.sass !== false && sass_match.test(contentType)) {
type = Factory.Minifier.TYPE_SASS;
res.setHeader('Content-Type', 'text/css');
} else if (minifier.less !== false && less_match.test(contentType)) {
type = Factory.Minifier.TYPE_LESS;
res.setHeader('Content-Type', 'text/css');
} else if (minifier.stylus !== false && stylus_match.test(contentType)) {
type = Factory.Minifier.TYPE_STYLUS;
res.setHeader('Content-Type', 'text/css');
} else if (minifier.coffee !== false && coffee_match.test(contentType)) {
type = Factory.Minifier.TYPE_COFFEE;
res.setHeader('Content-Type', 'text/javascript');
} else if (json_match.test(contentType)) {
type = Factory.Minifier.TYPE_JSON;
} else if (js_match.test(contentType)) {
type = Factory.Minifier.TYPE_JS;
} else if (css_match.test(contentType)) {
type = Factory.Minifier.TYPE_CSS;
}
if (type === Factory.Minifier.TYPE_TEXT) {
return;
}
if ((type === Factory.Minifier.TYPE_JS || type === Factory.Minifier.TYPE_CSS) && res._no_minify) {
return;
}
res.removeHeader('Content-Length');
// prepare the buffer
buf = [];
});
res.write = function (chunk, encoding) {
if (!this._header) {
this._implicitHeader();
}
if (buf === null) {
return write.call(this, chunk, encoding);
}
if (!this._hasBody) {
return true;
}
if (typeof chunk !== 'string' && !Buffer.isBuffer(chunk)) {
throw new TypeError('first argument must be a string or Buffer');
}
if (chunk.length === 0) {
return true;
}
// no chunked_encoding here
if (typeof chunk === 'string') {
chunk = new Buffer(chunk, encoding);
}
buf.push(chunk);
};
res.end = function (data, encoding) {
if (this.finished) {
return false;
}
if (!this._header) {
this._implicitHeader();
}
if (data && !this._hasBody) {
data = false;
}
if (buf === null) {
return end.call(this, data, encoding);
}
// TODO: implement hot-path optimization
if (data) {
this.write(data, encoding);
}
var buffer = Buffer.concat(buf);
// prepare uglify options
var uglifyOptions = {};
if (this._no_mangle) {
uglifyOptions.mangle = false;
}
if (this._uglifyMangle !== undefined) {
uglifyOptions.mangle = this._uglifyMangle;
}
if (this._uglifyOutput !== undefined) {
uglifyOptions.output = this._uglifyOutput;
}
if (this._uglifyCompress !== undefined) {
uglifyOptions.compress = this._uglifyCompress;
}
var minifyOptions = {
uglifyOpt: uglifyOptions,
noMinify: this._no_minify
};
var cacheKey = crypto.createHash('sha1').update(JSON.stringify(minifyOptions) + buffer).digest('hex').toString();
var self = this;
cache.layer.get(cacheKey, function (err, minized) {
if (err) {
// cache miss
minifier.compileAndMinify(type, minifyOptions, buffer.toString(encoding), function (err, minized) {
if (self._no_cache || err) {
// do not cache the response body
write.call(self, minized, 'utf8');
end.call(self);
} else {
cache.layer.put(cacheKey, minized, function () {
write.call(self, minized, 'utf8');
end.call(self);
});
}
});
} else {
// cache hit
write.call(self, minized, 'utf8');
end.call(self);
}
});
};
next();
};
};
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