105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
package proxy
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import (
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"fmt"
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"net/http"
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"net/http/httputil"
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"net/url"
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"time"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper"
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)
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var (
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defaultTarget = helper.URLMustParse("http://localhost")
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)
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type Proxy struct {
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Version string
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reverseProxy *httputil.ReverseProxy
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AllowResponseBuffering bool
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customHeaders map[string]string
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forceTargetHostHeader bool
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}
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func WithCustomHeaders(customHeaders map[string]string) func(*Proxy) {
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return func(proxy *Proxy) {
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proxy.customHeaders = customHeaders
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}
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}
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func WithForcedTargetHostHeader() func(*Proxy) {
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return func(proxy *Proxy) {
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proxy.forceTargetHostHeader = true
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}
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}
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func NewProxy(myURL *url.URL, version string, roundTripper http.RoundTripper, options ...func(*Proxy)) *Proxy {
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p := Proxy{Version: version, AllowResponseBuffering: true, customHeaders: make(map[string]string)}
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if myURL == nil {
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myURL = defaultTarget
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}
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u := *myURL // Make a copy of p.URL
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u.Path = ""
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p.reverseProxy = httputil.NewSingleHostReverseProxy(&u)
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p.reverseProxy.Transport = roundTripper
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for _, option := range options {
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option(&p)
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}
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if p.forceTargetHostHeader {
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// because of https://github.com/golang/go/issues/28168, the
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// upstream won't receive the expected Host header unless this
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// is forced in the Director func here
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previousDirector := p.reverseProxy.Director
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p.reverseProxy.Director = func(request *http.Request) {
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previousDirector(request)
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// send original host along for the upstream
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// to know it's being proxied under a different Host
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// (for redirects and other stuff that depends on this)
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request.Header.Set("X-Forwarded-Host", request.Host)
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request.Header.Set("Forwarded", fmt.Sprintf("host=%s", request.Host))
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// override the Host with the target
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request.Host = request.URL.Host
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}
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}
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return &p
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}
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func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Clone request
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req := *r
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req.Header = helper.HeaderClone(r.Header)
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// Set Workhorse version
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req.Header.Set("Gitlab-Workhorse", p.Version)
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req.Header.Set("Gitlab-Workhorse-Proxy-Start", fmt.Sprintf("%d", time.Now().UnixNano()))
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for k, v := range p.customHeaders {
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req.Header.Set(k, v)
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}
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if p.AllowResponseBuffering {
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helper.AllowResponseBuffering(w)
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}
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// If the ultimate client disconnects when the response isn't fully written
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// to them yet, httputil.ReverseProxy panics with a net/http.ErrAbortHandler
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// error. We can catch and discard this to keep the error log clean
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defer func() {
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if err := recover(); err != nil {
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if err != http.ErrAbortHandler {
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panic(err)
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}
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}
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}()
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p.reverseProxy.ServeHTTP(w, &req)
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}
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