forgejo/routers/repo/http.go

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// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
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package repo
import (
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"bytes"
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"compress/gzip"
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"fmt"
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"io"
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"io/ioutil"
"net/http"
"os"
"os/exec"
"path"
"regexp"
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"runtime"
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"strconv"
"strings"
"time"
"code.gitea.io/git"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
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)
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// HTTP implmentation git smart HTTP protocol
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func HTTP(ctx *context.Context) {
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username := ctx.Params(":username")
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reponame := strings.TrimSuffix(ctx.Params(":reponame"), ".git")
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var isPull bool
service := ctx.Query("service")
if service == "git-receive-pack" ||
strings.HasSuffix(ctx.Req.URL.Path, "git-receive-pack") {
isPull = false
} else if service == "git-upload-pack" ||
strings.HasSuffix(ctx.Req.URL.Path, "git-upload-pack") {
isPull = true
} else if service == "git-upload-archive" ||
strings.HasSuffix(ctx.Req.URL.Path, "git-upload-archive") {
isPull = true
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} else {
isPull = (ctx.Req.Method == "GET")
}
var accessMode models.AccessMode
if isPull {
accessMode = models.AccessModeRead
} else {
accessMode = models.AccessModeWrite
}
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isWiki := false
if strings.HasSuffix(reponame, ".wiki") {
isWiki = true
reponame = reponame[:len(reponame)-5]
}
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repoUser, err := models.GetUserByName(username)
if err != nil {
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if models.IsErrUserNotExist(err) {
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ctx.Handle(http.StatusNotFound, "GetUserByName", nil)
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} else {
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ctx.Handle(http.StatusInternalServerError, "GetUserByName", err)
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}
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return
}
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repo, err := models.GetRepositoryByName(repoUser.ID, reponame)
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if err != nil {
if models.IsErrRepoNotExist(err) {
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ctx.Handle(http.StatusNotFound, "GetRepositoryByName", nil)
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} else {
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ctx.Handle(http.StatusInternalServerError, "GetRepositoryByName", err)
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}
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return
}
// Only public pull don't need auth.
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isPublicPull := !repo.IsPrivate && isPull
var (
askAuth = !isPublicPull || setting.Service.RequireSignInView
authUser *models.User
authUsername string
authPasswd string
)
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// check access
if askAuth {
if setting.Service.EnableReverseProxyAuth {
authUsername = ctx.Req.Header.Get(setting.ReverseProxyAuthUser)
if len(authUsername) == 0 {
ctx.HandleText(401, "reverse proxy login error. authUsername empty")
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return
}
authUser, err = models.GetUserByName(authUsername)
if err != nil {
ctx.HandleText(401, "reverse proxy login error, got error while running GetUserByName")
return
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}
} else {
authHead := ctx.Req.Header.Get("Authorization")
if len(authHead) == 0 {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=\".\"")
ctx.Error(http.StatusUnauthorized)
return
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}
auths := strings.Fields(authHead)
// currently check basic auth
// TODO: support digit auth
// FIXME: middlewares/context.go did basic auth check already,
// maybe could use that one.
if len(auths) != 2 || auths[0] != "Basic" {
ctx.HandleText(http.StatusUnauthorized, "no basic auth and digit auth")
return
}
authUsername, authPasswd, err = base.BasicAuthDecode(auths[1])
if err != nil {
ctx.HandleText(http.StatusUnauthorized, "no basic auth and digit auth")
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return
}
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authUser, err = models.UserSignIn(authUsername, authPasswd)
if err != nil {
if !models.IsErrUserNotExist(err) {
ctx.Handle(http.StatusInternalServerError, "UserSignIn error: %v", err)
return
}
// Assume username now is a token.
token, err := models.GetAccessTokenBySHA(authUsername)
if err != nil {
if models.IsErrAccessTokenNotExist(err) || models.IsErrAccessTokenEmpty(err) {
ctx.HandleText(http.StatusUnauthorized, "invalid token")
} else {
ctx.Handle(http.StatusInternalServerError, "GetAccessTokenBySha", err)
}
return
}
token.Updated = time.Now()
if err = models.UpdateAccessToken(token); err != nil {
ctx.Handle(http.StatusInternalServerError, "UpdateAccessToken", err)
}
authUser, err = models.GetUserByID(token.UID)
if err != nil {
ctx.Handle(http.StatusInternalServerError, "GetUserByID", err)
return
}
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}
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if !isPublicPull {
has, err := models.HasAccess(authUser, repo, accessMode)
if err != nil {
ctx.Handle(http.StatusInternalServerError, "HasAccess", err)
return
} else if !has {
if accessMode == models.AccessModeRead {
has, err = models.HasAccess(authUser, repo, models.AccessModeWrite)
if err != nil {
ctx.Handle(http.StatusInternalServerError, "HasAccess2", err)
return
} else if !has {
ctx.HandleText(http.StatusForbidden, "User permission denied")
return
}
} else {
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ctx.HandleText(http.StatusForbidden, "User permission denied")
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return
}
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}
if !isPull && repo.IsMirror {
ctx.HandleText(http.StatusForbidden, "mirror repository is read-only")
return
}
}
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}
}
callback := func(rpc string, input []byte) {
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if rpc != "receive-pack" || isWiki {
return
}
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var lastLine int64
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for {
head := input[lastLine : lastLine+2]
if head[0] == '0' && head[1] == '0' {
size, err := strconv.ParseInt(string(input[lastLine+2:lastLine+4]), 16, 32)
if err != nil {
log.Error(4, "%v", err)
return
}
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if size == 0 {
//fmt.Println(string(input[lastLine:]))
break
}
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line := input[lastLine : lastLine+size]
idx := bytes.IndexRune(line, '\000')
if idx > -1 {
line = line[:idx]
}
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fields := strings.Fields(string(line))
if len(fields) >= 3 {
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oldCommitID := fields[0][4:]
newCommitID := fields[1]
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refFullName := fields[2]
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// FIXME: handle error.
if err = models.PushUpdate(models.PushUpdateOptions{
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RefFullName: refFullName,
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OldCommitID: oldCommitID,
NewCommitID: newCommitID,
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PusherID: authUser.ID,
PusherName: authUser.Name,
RepoUserName: username,
RepoName: reponame,
}); err == nil {
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go models.AddTestPullRequestTask(authUser, repo.ID, strings.TrimPrefix(refFullName, git.BranchPrefix), true)
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}
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}
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lastLine = lastLine + size
} else {
break
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}
}
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}
params := make(map[string]string)
if askAuth {
params[models.ProtectedBranchUserID] = fmt.Sprintf("%d", authUser.ID)
if err == nil {
params[models.ProtectedBranchAccessMode] = accessMode.String()
}
params[models.ProtectedBranchRepoID] = fmt.Sprintf("%d", repo.ID)
}
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HTTPBackend(ctx, &serviceConfig{
UploadPack: true,
ReceivePack: true,
Params: params,
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OnSucceed: callback,
})(ctx.Resp, ctx.Req.Request)
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runtime.GC()
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}
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type serviceConfig struct {
UploadPack bool
ReceivePack bool
Params map[string]string
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OnSucceed func(rpc string, input []byte)
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}
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type serviceHandler struct {
cfg *serviceConfig
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w http.ResponseWriter
r *http.Request
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dir string
file string
}
func (h *serviceHandler) setHeaderNoCache() {
h.w.Header().Set("Expires", "Fri, 01 Jan 1980 00:00:00 GMT")
h.w.Header().Set("Pragma", "no-cache")
h.w.Header().Set("Cache-Control", "no-cache, max-age=0, must-revalidate")
}
func (h *serviceHandler) getBranch(input []byte) string {
var lastLine int64
var branchName string
for {
head := input[lastLine : lastLine+2]
if head[0] == '0' && head[1] == '0' {
size, err := strconv.ParseInt(string(input[lastLine+2:lastLine+4]), 16, 32)
if err != nil {
log.Error(4, "%v", err)
return branchName
}
if size == 0 {
//fmt.Println(string(input[lastLine:]))
break
}
line := input[lastLine : lastLine+size]
idx := bytes.IndexRune(line, '\000')
if idx > -1 {
line = line[:idx]
}
fields := strings.Fields(string(line))
if len(fields) >= 3 {
refFullName := fields[2]
branchName = strings.TrimPrefix(refFullName, git.BranchPrefix)
}
lastLine = lastLine + size
} else {
break
}
}
return branchName
}
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func (h *serviceHandler) setHeaderCacheForever() {
now := time.Now().Unix()
expires := now + 31536000
h.w.Header().Set("Date", fmt.Sprintf("%d", now))
h.w.Header().Set("Expires", fmt.Sprintf("%d", expires))
h.w.Header().Set("Cache-Control", "public, max-age=31536000")
}
func (h *serviceHandler) sendFile(contentType string) {
reqFile := path.Join(h.dir, h.file)
fi, err := os.Stat(reqFile)
if os.IsNotExist(err) {
h.w.WriteHeader(http.StatusNotFound)
return
}
h.w.Header().Set("Content-Type", contentType)
h.w.Header().Set("Content-Length", fmt.Sprintf("%d", fi.Size()))
h.w.Header().Set("Last-Modified", fi.ModTime().Format(http.TimeFormat))
http.ServeFile(h.w, h.r, reqFile)
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}
type route struct {
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reg *regexp.Regexp
method string
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handler func(serviceHandler)
}
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var routes = []route{
{regexp.MustCompile("(.*?)/git-upload-pack$"), "POST", serviceUploadPack},
{regexp.MustCompile("(.*?)/git-receive-pack$"), "POST", serviceReceivePack},
{regexp.MustCompile("(.*?)/info/refs$"), "GET", getInfoRefs},
{regexp.MustCompile("(.*?)/HEAD$"), "GET", getTextFile},
{regexp.MustCompile("(.*?)/objects/info/alternates$"), "GET", getTextFile},
{regexp.MustCompile("(.*?)/objects/info/http-alternates$"), "GET", getTextFile},
{regexp.MustCompile("(.*?)/objects/info/packs$"), "GET", getInfoPacks},
{regexp.MustCompile("(.*?)/objects/info/[^/]*$"), "GET", getTextFile},
{regexp.MustCompile("(.*?)/objects/[0-9a-f]{2}/[0-9a-f]{38}$"), "GET", getLooseObject},
{regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.pack$"), "GET", getPackFile},
{regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.idx$"), "GET", getIdxFile},
}
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// FIXME: use process module
func gitCommand(dir string, args ...string) []byte {
cmd := exec.Command("git", args...)
cmd.Dir = dir
out, err := cmd.Output()
if err != nil {
log.GitLogger.Error(4, fmt.Sprintf("%v - %s", err, out))
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}
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return out
}
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func getGitConfig(option, dir string) string {
out := string(gitCommand(dir, "config", option))
return out[0 : len(out)-1]
}
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func getConfigSetting(service, dir string) bool {
service = strings.Replace(service, "-", "", -1)
setting := getGitConfig("http."+service, dir)
if service == "uploadpack" {
return setting != "false"
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}
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return setting == "true"
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}
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func hasAccess(service string, h serviceHandler, checkContentType bool) bool {
if checkContentType {
if h.r.Header.Get("Content-Type") != fmt.Sprintf("application/x-git-%s-request", service) {
return false
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}
}
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if !(service == "upload-pack" || service == "receive-pack") {
return false
}
if service == "receive-pack" {
return h.cfg.ReceivePack
}
if service == "upload-pack" {
return h.cfg.UploadPack
}
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return getConfigSetting(service, h.dir)
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}
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func serviceRPC(h serviceHandler, service string) {
defer h.r.Body.Close()
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if !hasAccess(service, h, true) {
h.w.WriteHeader(http.StatusUnauthorized)
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return
}
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h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-result", service))
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var (
reqBody = h.r.Body
input []byte
br io.Reader
err error
branchName string
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)
// Handle GZIP.
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if h.r.Header.Get("Content-Encoding") == "gzip" {
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reqBody, err = gzip.NewReader(reqBody)
if err != nil {
log.GitLogger.Error(2, "fail to create gzip reader: %v", err)
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h.w.WriteHeader(http.StatusInternalServerError)
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return
}
}
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if h.cfg.OnSucceed != nil {
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input, err = ioutil.ReadAll(reqBody)
if err != nil {
log.GitLogger.Error(2, "fail to read request body: %v", err)
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h.w.WriteHeader(http.StatusInternalServerError)
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return
}
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branchName = h.getBranch(input)
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br = bytes.NewReader(input)
} else {
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br = reqBody
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}
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// check protected branch
repoID, _ := strconv.ParseInt(h.cfg.Params[models.ProtectedBranchRepoID], 10, 64)
accessMode := models.ParseAccessMode(h.cfg.Params[models.ProtectedBranchAccessMode])
// skip admin or owner AccessMode
if accessMode == models.AccessModeWrite {
protectBranch, err := models.GetProtectedBranchBy(repoID, branchName)
if err != nil {
log.GitLogger.Error(2, "fail to get protected branch information: %v", err)
h.w.WriteHeader(http.StatusInternalServerError)
return
}
if protectBranch != nil {
log.GitLogger.Error(2, "protected branches can not be pushed to")
h.w.WriteHeader(http.StatusForbidden)
return
}
}
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cmd := exec.Command("git", service, "--stateless-rpc", h.dir)
cmd.Dir = h.dir
cmd.Stdout = h.w
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cmd.Stdin = br
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if err := cmd.Run(); err != nil {
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log.GitLogger.Error(2, "fail to serve RPC(%s): %v", service, err)
h.w.WriteHeader(http.StatusInternalServerError)
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return
}
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if h.cfg.OnSucceed != nil {
h.cfg.OnSucceed(service, input)
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}
}
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func serviceUploadPack(h serviceHandler) {
serviceRPC(h, "upload-pack")
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}
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func serviceReceivePack(h serviceHandler) {
serviceRPC(h, "receive-pack")
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}
func getServiceType(r *http.Request) string {
serviceType := r.FormValue("service")
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if !strings.HasPrefix(serviceType, "git-") {
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return ""
}
return strings.Replace(serviceType, "git-", "", 1)
}
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func updateServerInfo(dir string) []byte {
return gitCommand(dir, "update-server-info")
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}
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func packetWrite(str string) []byte {
s := strconv.FormatInt(int64(len(str)+4), 16)
if len(s)%4 != 0 {
s = strings.Repeat("0", 4-len(s)%4) + s
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}
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return []byte(s + str)
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}
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func getInfoRefs(h serviceHandler) {
h.setHeaderNoCache()
if hasAccess(getServiceType(h.r), h, false) {
service := getServiceType(h.r)
refs := gitCommand(h.dir, service, "--stateless-rpc", "--advertise-refs", ".")
h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-advertisement", service))
h.w.WriteHeader(http.StatusOK)
h.w.Write(packetWrite("# service=git-" + service + "\n"))
h.w.Write([]byte("0000"))
h.w.Write(refs)
} else {
updateServerInfo(h.dir)
h.sendFile("text/plain; charset=utf-8")
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}
}
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func getTextFile(h serviceHandler) {
h.setHeaderNoCache()
h.sendFile("text/plain")
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}
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func getInfoPacks(h serviceHandler) {
h.setHeaderCacheForever()
h.sendFile("text/plain; charset=utf-8")
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}
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func getLooseObject(h serviceHandler) {
h.setHeaderCacheForever()
h.sendFile("application/x-git-loose-object")
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}
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func getPackFile(h serviceHandler) {
h.setHeaderCacheForever()
h.sendFile("application/x-git-packed-objects")
}
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func getIdxFile(h serviceHandler) {
h.setHeaderCacheForever()
h.sendFile("application/x-git-packed-objects-toc")
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}
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func getGitRepoPath(subdir string) (string, error) {
if !strings.HasSuffix(subdir, ".git") {
subdir += ".git"
}
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fpath := path.Join(setting.RepoRootPath, subdir)
if _, err := os.Stat(fpath); os.IsNotExist(err) {
return "", err
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}
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return fpath, nil
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}
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// HTTPBackend middleware for git smart HTTP protocol
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func HTTPBackend(ctx *context.Context, cfg *serviceConfig) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
for _, route := range routes {
r.URL.Path = strings.ToLower(r.URL.Path) // blue: In case some repo name has upper case name
if m := route.reg.FindStringSubmatch(r.URL.Path); m != nil {
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if setting.Repository.DisableHTTPGit {
w.WriteHeader(http.StatusForbidden)
w.Write([]byte("Interacting with repositories by HTTP protocol is not allowed"))
return
}
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if route.method != r.Method {
if r.Proto == "HTTP/1.1" {
w.WriteHeader(http.StatusMethodNotAllowed)
w.Write([]byte("Method Not Allowed"))
} else {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Bad Request"))
}
return
}
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file := strings.Replace(r.URL.Path, m[1]+"/", "", 1)
dir, err := getGitRepoPath(m[1])
if err != nil {
log.GitLogger.Error(4, err.Error())
ctx.Handle(http.StatusNotFound, "HTTPBackend", err)
return
}
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route.handler(serviceHandler{cfg, w, r, dir, file})
return
}
}
ctx.Handle(http.StatusNotFound, "HTTPBackend", nil)
return
}
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}