/
receive_pack_session.go
220 lines (209 loc) · 5.03 KB
/
receive_pack_session.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright © 2021 Wrangle Ltd
package apiserver
import (
"bytes"
"compress/gzip"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"strings"
"time"
"github.com/google/uuid"
"github.com/wrgl/core/pkg/api"
"github.com/wrgl/core/pkg/api/payload"
apiutils "github.com/wrgl/core/pkg/api/utils"
"github.com/wrgl/core/pkg/conf"
"github.com/wrgl/core/pkg/encoding"
"github.com/wrgl/core/pkg/objects"
"github.com/wrgl/core/pkg/ref"
)
type ReceivePackSession struct {
db objects.Store
rs ref.Store
c *conf.Config
updates map[string]*payload.Update
state stateFn
receiver *apiutils.ObjectReceiver
id uuid.UUID
}
func NewReceivePackSession(db objects.Store, rs ref.Store, c *conf.Config, id uuid.UUID) *ReceivePackSession {
s := &ReceivePackSession{
db: db,
rs: rs,
c: c,
id: id,
}
s.state = s.greet
return s
}
func (s *ReceivePackSession) saveRefs() error {
for dst, u := range s.updates {
oldSum, _ := ref.GetRef(s.rs, strings.TrimPrefix(dst, "refs/"))
if (u.OldSum == nil && oldSum != nil) || (u.OldSum != nil && !bytes.Equal(oldSum, (*u.OldSum)[:])) {
u.ErrMsg = "remote ref updated since checkout"
continue
}
var sum []byte
if u.Sum == nil {
if s.c.Receive != nil && *s.c.Receive.DenyDeletes {
u.ErrMsg = "remote does not support deleting refs"
} else {
err := ref.DeleteRef(s.rs, strings.TrimPrefix(dst, "refs/"))
if err != nil {
return err
}
}
continue
} else {
sum = (*u.Sum)[:]
if !objects.CommitExist(s.db, sum) {
u.ErrMsg = "remote did not receive commit"
continue
}
}
var msg string
if oldSum != nil {
if s.c.Receive != nil && *s.c.Receive.DenyNonFastForwards {
fastForward, err := ref.IsAncestorOf(s.db, oldSum, sum)
if err != nil {
return err
} else if !fastForward {
u.ErrMsg = "remote does not support non-fast-fowards"
continue
}
}
msg = "update ref"
} else {
msg = "create ref"
}
err := ref.SaveRef(
s.rs,
strings.TrimPrefix(dst, "refs/"),
sum,
s.c.User.Name,
s.c.User.Email,
"receive-pack",
msg,
)
if err != nil {
return err
}
}
return nil
}
func (s *ReceivePackSession) greet(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
var err error
if v := r.Header.Get("Content-Type"); v != api.CTJSON {
http.Error(rw, "updates expected", http.StatusBadRequest)
return nil
}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return
}
req := &payload.ReceivePackRequest{}
err = json.Unmarshal(b, req)
if err != nil {
return
}
s.updates = req.Updates
commits := [][]byte{}
outdated := false
for dst, u := range s.updates {
oldSum, err := ref.GetRef(s.rs, strings.TrimPrefix(dst, "refs/"))
if err != nil {
oldSum = nil
}
if (u.OldSum == nil && oldSum != nil) || (u.OldSum != nil && !bytes.Equal(oldSum, (*u.OldSum)[:])) {
outdated = true
u.ErrMsg = "remote ref updated since checkout"
}
if u.Sum != nil {
commits = append(commits, (*u.Sum)[:])
}
}
if outdated {
return s.reportStatus(rw, r)
}
if len(commits) > 0 {
s.receiver = apiutils.NewObjectReceiver(s.db, commits)
return s.askForMore(rw, r)
}
err = s.saveRefs()
if err != nil {
panic(err)
}
return s.reportStatus(rw, r)
}
func (s *ReceivePackSession) receiveObjects(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
if v := r.Header.Get("Content-Type"); v != api.CTPackfile {
http.Error(rw, "packfile expected", http.StatusBadRequest)
return nil
}
body := r.Body
if r.Header.Get("Content-Encoding") == "gzip" {
gr, err := gzip.NewReader(r.Body)
if err != nil {
panic(err)
}
body = io.NopCloser(gr)
}
pr, err := encoding.NewPackfileReader(body)
if err != nil {
panic(err)
}
done, err := s.receiver.Receive(pr)
if err != nil {
panic(err)
}
if !done {
return s.askForMore(rw, r)
}
err = s.saveRefs()
if err != nil {
panic(err)
}
return s.reportStatus(rw, r)
}
func (s *ReceivePackSession) askForMore(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
http.SetCookie(rw, &http.Cookie{
Name: api.CookieReceivePackSession,
Value: s.id.String(),
Path: r.URL.Path,
HttpOnly: true,
MaxAge: 3600 * 3,
})
rw.WriteHeader(http.StatusOK)
return s.receiveObjects
}
func (s *ReceivePackSession) reportStatus(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
rw.Header().Set("Content-Type", api.CTJSON)
// remove cookie
http.SetCookie(rw, &http.Cookie{
Name: api.CookieReceivePackSession,
Value: s.id.String(),
Path: r.URL.Path,
HttpOnly: true,
Expires: time.Now().Add(time.Hour * -24),
})
resp := &payload.ReceivePackResponse{
Updates: s.updates,
}
b, err := json.Marshal(resp)
if err != nil {
panic(err)
}
_, err = rw.Write(b)
if err != nil {
panic(err)
}
return nil
}
// ServeHTTP receives, saves objects and update refs, returns true when session is
// finished and can be removed.
func (s *ReceivePackSession) ServeHTTP(rw http.ResponseWriter, r *http.Request) bool {
s.state = s.state(rw, r)
return s.state == nil
}