40 lines
968 B
JavaScript
40 lines
968 B
JavaScript
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var stream = require('stream');
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var util = require('util');
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var Transform = stream.Transform;
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var HeaderHostTransformer = function(opts) {
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if (!(this instanceof HeaderHostTransformer)) {
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return new HeaderHostTransformer(opts);
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}
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opts = opts || {}
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Transform.call(this, opts);
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var self = this;
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self.host = opts.host || 'localhost';
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self.replaced = false;
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}
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util.inherits(HeaderHostTransformer, Transform);
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HeaderHostTransformer.prototype._transform = function (chunk, enc, cb) {
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var self = this;
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// after replacing the first instance of the Host header
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// we just become a regular passthrough
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if (!self.replaced) {
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chunk = chunk.toString();
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self.push(chunk.replace(/(\r\n[Hh]ost: )\S+/, function(match, $1) {
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self.replaced = true;
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return $1 + self.host;
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}));
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}
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else {
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self.push(chunk);
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}
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cb();
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};
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module.exports = HeaderHostTransformer;
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