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allow setting max height and width

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This is primarily added to prevent a denial of service attack where
insanely large images are requested, eating up CPU.
This commit is contained in:
Will Norris 2013-12-06 14:17:39 -08:00
parent 8310f6eb79
commit 036d0c51c4
2 changed files with 12 additions and 0 deletions
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10
proxy/proxy.go
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@ -69,6 +69,9 @@ type Proxy struct {
// Whitelist specifies a list of remote hosts that images can be proxied from. An empty list means all hosts are allowed.
Whitelist []string
MaxWidth int
MaxHeight int
}
// NewProxy constructs a new proxy. The provided http Client will be used to
@ -88,6 +91,13 @@ func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
return
}
if p.MaxWidth > 0 && req.Options.Width > p.MaxWidth {
req.Options.Width = p.MaxWidth
}
if p.MaxHeight > 0 && req.Options.Height > p.MaxHeight {
req.Options.Height = p.MaxHeight
}
u := req.URL.String()
glog.Infof("request for image: %v", u)