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/*
The upstream type implements http.Handler.
In this file we handle request routing and interaction with the authBackend.
*/
package upstream
import (
"fmt"
"os"
"net/http"
"strings"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/labkit/correlation"
apipkg "gitlab.com/gitlab-org/gitlab-workhorse/internal/api"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/log"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/rejectmethods"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/upload"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/upstream/roundtripper"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/urlprefix"
)
var (
DefaultBackend = helper.URLMustParse("http://localhost:8080")
requestHeaderBlacklist = []string{
upload.RewrittenFieldsHeader,
}
)
type upstream struct {
config.Config
URLPrefix urlprefix.Prefix
Routes []routeEntry
RoundTripper http.RoundTripper
CableRoundTripper http.RoundTripper
APIClient *apipkg.API
accessLogger *logrus.Logger
enableGeoProxyFeature bool
}
func NewUpstream(cfg config.Config, accessLogger *logrus.Logger) http.Handler {
return newUpstream(cfg, accessLogger, configureRoutes)
}
func newUpstream(cfg config.Config, accessLogger *logrus.Logger, routesCallback func(*upstream)) http.Handler {
up := upstream{
Config: cfg,
accessLogger: accessLogger,
}
if up.Backend == nil {
up.Backend = DefaultBackend
}
if up.CableBackend == nil {
up.CableBackend = up.Backend
}
if up.CableSocket == "" {
up.CableSocket = up.Socket
}
up.RoundTripper = roundtripper.NewBackendRoundTripper(up.Backend, up.Socket, up.ProxyHeadersTimeout, cfg.DevelopmentMode)
up.CableRoundTripper = roundtripper.NewBackendRoundTripper(up.CableBackend, up.CableSocket, up.ProxyHeadersTimeout, cfg.DevelopmentMode)
up.configureURLPrefix()
up.APIClient = apipkg.NewAPI(
up.Backend,
up.Version,
up.RoundTripper,
)
// Kind of a feature flag. See https://gitlab.com/groups/gitlab-org/-/epics/5914#note_564974130
up.enableGeoProxyFeature = os.Getenv("GEO_SECONDARY_PROXY") == "1"
routesCallback(&up)
var correlationOpts []correlation.InboundHandlerOption
if cfg.PropagateCorrelationID {
correlationOpts = append(correlationOpts, correlation.WithPropagation())
}
handler := correlation.InjectCorrelationID(&up, correlationOpts...)
// TODO: move to LabKit https://gitlab.com/gitlab-org/gitlab-workhorse/-/issues/339
handler = rejectmethods.NewMiddleware(handler)
return handler
}
func (u *upstream) configureURLPrefix() {
relativeURLRoot := u.Backend.Path
if !strings.HasSuffix(relativeURLRoot, "/") {
relativeURLRoot += "/"
}
u.URLPrefix = urlprefix.Prefix(relativeURLRoot)
}
func (u *upstream) ServeHTTP(w http.ResponseWriter, r *http.Request) {
helper.FixRemoteAddr(r)
helper.DisableResponseBuffering(w)
// Drop RequestURI == "*" (FIXME: why?)
if r.RequestURI == "*" {
helper.HTTPError(w, r, "Connection upgrade not allowed", http.StatusBadRequest)
return
}
// Disallow connect
if r.Method == "CONNECT" {
helper.HTTPError(w, r, "CONNECT not allowed", http.StatusBadRequest)
return
}
// Check URL Root
URIPath := urlprefix.CleanURIPath(r.URL.EscapedPath())
prefix := u.URLPrefix
if !prefix.Match(URIPath) {
helper.HTTPError(w, r, fmt.Sprintf("Not found %q", URIPath), http.StatusNotFound)
return
}
// Look for a matching route
var route *routeEntry
if u.enableGeoProxyFeature {
geoProxyURL, err := u.APIClient.GetGeoProxyURL()
if err == nil {
log.WithRequest(r).WithFields(log.Fields{"geoProxyURL": geoProxyURL}).Info("Geo Proxy: Set route according to Geo Proxy logic")
} else if err != apipkg.ErrNotGeoSecondary {
log.WithRequest(r).WithError(err).Error("Geo Proxy: Unable to determine Geo Proxy URL. Falling back to normal routing")
}
}
for _, ro := range u.Routes {
if ro.isMatch(prefix.Strip(URIPath), r) {
route = &ro
break
}
}
if route == nil {
// The protocol spec in git/Documentation/technical/http-protocol.txt
// says we must return 403 if no matching service is found.
helper.HTTPError(w, r, "Forbidden", http.StatusForbidden)
return
}
for _, h := range requestHeaderBlacklist {
r.Header.Del(h)
}
route.handler.ServeHTTP(w, r)
}
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