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/*
In this file we handle the Git 'smart HTTP' protocol
*/
package git
import (
"fmt"
"io"
"net/http"
"path/filepath"
"sync"
"gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/api"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/log"
)
const (
// We have to use a negative transfer.hideRefs since this is the only way
// to undo an already set parameter: https://www.spinics.net/lists/git/msg256772.html
GitConfigShowAllRefs = "transfer.hideRefs=!refs"
)
func ReceivePack(a *api.API) http.Handler {
return postRPCHandler(a, "handleReceivePack", handleReceivePack, sendGitAuditEvent("git-receive-pack"), writeReceivePackError)
}
func UploadPack(a *api.API) http.Handler {
return postRPCHandler(a, "handleUploadPack", handleUploadPack, sendGitAuditEvent("git-upload-pack"), writeUploadPackError)
}
func gitConfigOptions(a *api.Response) []string {
var out []string
if a.ShowAllRefs {
out = append(out, GitConfigShowAllRefs)
}
return out
}
func postRPCHandler(
a *api.API,
name string,
handler func(*HTTPResponseWriter, *http.Request, *api.Response) (*gitalypb.PackfileNegotiationStatistics, error),
postFunc func(*api.API, *http.Request, *api.Response, *gitalypb.PackfileNegotiationStatistics),
errWriter func(io.Writer) error,
) http.Handler {
return repoPreAuthorizeHandler(a, func(rw http.ResponseWriter, r *http.Request, ar *api.Response) {
cr := &countReadCloser{ReadCloser: r.Body}
r.Body = cr
w := NewHTTPResponseWriter(rw)
defer func() {
w.Log(r, cr.Count())
}()
stats, err := handler(w, r, ar)
if err != nil {
handleLimitErr(err, w, errWriter)
// If the handler, or handleLimitErr already wrote a response this WriteHeader call is a
// no-op. It never reaches net/http because GitHttpResponseWriter calls
// WriteHeader on its underlying ResponseWriter at most once.
w.WriteHeader(500)
log.WithRequest(r).WithError(fmt.Errorf("%s: %v", name, err)).Error()
}
postFunc(a, r, ar, stats)
})
}
func repoPreAuthorizeHandler(myAPI *api.API, handleFunc api.HandleFunc) http.Handler {
return myAPI.PreAuthorizeHandler(func(w http.ResponseWriter, r *http.Request, a *api.Response) {
handleFunc(w, r, a)
}, "")
}
func sendGitAuditEvent(action string) func(*api.API, *http.Request, *api.Response, *gitalypb.PackfileNegotiationStatistics) {
return func(a *api.API, r *http.Request, response *api.Response, stats *gitalypb.PackfileNegotiationStatistics) {
if !response.NeedAudit {
return
}
ctx := r.Context()
err := a.SendGitAuditEvent(ctx, api.GitAuditEventRequest{
Action: action,
Protocol: "http",
Repo: response.GL_REPOSITORY,
Username: response.GL_USERNAME,
PackfileStats: stats,
})
if err != nil {
log.WithContextFields(ctx, log.Fields{
"repo": response.GL_REPOSITORY,
"action": action,
"username": response.GL_USERNAME,
}).WithError(err).Error("failed to send git audit event")
}
}
}
func writePostRPCHeader(w http.ResponseWriter, action string) {
w.Header().Set("Content-Type", fmt.Sprintf("application/x-%s-result", action))
w.Header().Set("Cache-Control", "no-cache")
}
func getService(r *http.Request) string {
if r.Method == "GET" {
return r.URL.Query().Get("service")
}
return filepath.Base(r.URL.Path)
}
type countReadCloser struct {
n int64
io.ReadCloser
sync.Mutex
}
func (c *countReadCloser) Read(p []byte) (n int, err error) {
n, err = c.ReadCloser.Read(p)
c.Lock()
defer c.Unlock()
c.n += int64(n)
return n, err
}
func (c *countReadCloser) Count() int64 {
c.Lock()
defer c.Unlock()
return c.n
}
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