127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
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/*
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The upstream type implements http.Handler.
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In this file we handle request routing and interaction with the authBackend.
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*/
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package upstream
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import (
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"fmt"
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"net/http"
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"strings"
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"github.com/sirupsen/logrus"
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"gitlab.com/gitlab-org/labkit/correlation"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/rejectmethods"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/upload"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/upstream/roundtripper"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/urlprefix"
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)
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var (
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DefaultBackend = helper.URLMustParse("http://localhost:8080")
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requestHeaderBlacklist = []string{
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upload.RewrittenFieldsHeader,
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}
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)
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type upstream struct {
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config.Config
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URLPrefix urlprefix.Prefix
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Routes []routeEntry
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RoundTripper http.RoundTripper
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CableRoundTripper http.RoundTripper
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accessLogger *logrus.Logger
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}
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func NewUpstream(cfg config.Config, accessLogger *logrus.Logger) http.Handler {
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up := upstream{
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Config: cfg,
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accessLogger: accessLogger,
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}
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if up.Backend == nil {
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up.Backend = DefaultBackend
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}
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if up.CableBackend == nil {
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up.CableBackend = up.Backend
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}
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if up.CableSocket == "" {
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up.CableSocket = up.Socket
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}
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up.RoundTripper = roundtripper.NewBackendRoundTripper(up.Backend, up.Socket, up.ProxyHeadersTimeout, cfg.DevelopmentMode)
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up.CableRoundTripper = roundtripper.NewBackendRoundTripper(up.CableBackend, up.CableSocket, up.ProxyHeadersTimeout, cfg.DevelopmentMode)
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up.configureURLPrefix()
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up.configureRoutes()
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var correlationOpts []correlation.InboundHandlerOption
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if cfg.PropagateCorrelationID {
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correlationOpts = append(correlationOpts, correlation.WithPropagation())
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}
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handler := correlation.InjectCorrelationID(&up, correlationOpts...)
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// TODO: move to LabKit https://gitlab.com/gitlab-org/gitlab-workhorse/-/issues/339
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handler = rejectmethods.NewMiddleware(handler)
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return handler
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}
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func (u *upstream) configureURLPrefix() {
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relativeURLRoot := u.Backend.Path
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if !strings.HasSuffix(relativeURLRoot, "/") {
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relativeURLRoot += "/"
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}
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u.URLPrefix = urlprefix.Prefix(relativeURLRoot)
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}
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func (u *upstream) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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helper.FixRemoteAddr(r)
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helper.DisableResponseBuffering(w)
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// Drop RequestURI == "*" (FIXME: why?)
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if r.RequestURI == "*" {
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helper.HTTPError(w, r, "Connection upgrade not allowed", http.StatusBadRequest)
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return
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}
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// Disallow connect
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if r.Method == "CONNECT" {
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helper.HTTPError(w, r, "CONNECT not allowed", http.StatusBadRequest)
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return
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}
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// Check URL Root
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URIPath := urlprefix.CleanURIPath(r.URL.Path)
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prefix := u.URLPrefix
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if !prefix.Match(URIPath) {
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helper.HTTPError(w, r, fmt.Sprintf("Not found %q", URIPath), http.StatusNotFound)
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return
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}
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// Look for a matching route
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var route *routeEntry
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for _, ro := range u.Routes {
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if ro.isMatch(prefix.Strip(URIPath), r) {
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route = &ro
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break
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}
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}
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if route == nil {
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// The protocol spec in git/Documentation/technical/http-protocol.txt
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// says we must return 403 if no matching service is found.
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helper.HTTPError(w, r, "Forbidden", http.StatusForbidden)
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return
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}
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for _, h := range requestHeaderBlacklist {
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r.Header.Del(h)
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}
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route.handler.ServeHTTP(w, r)
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}
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