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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"
"net/http"
"os"
"os/exec"
"path"
"regexp"
"strconv"
"strings"
"time"
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"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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"code.gitea.io/gitea/modules/util"
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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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if len ( setting . Repository . AccessControlAllowOrigin ) > 0 {
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allowedOrigin := setting . Repository . AccessControlAllowOrigin
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// Set CORS headers for browser-based git clients
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ctx . Resp . Header ( ) . Set ( "Access-Control-Allow-Origin" , allowedOrigin )
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ctx . Resp . Header ( ) . Set ( "Access-Control-Allow-Headers" , "Content-Type, Authorization, User-Agent" )
// Handle preflight OPTIONS request
if ctx . Req . Method == "OPTIONS" {
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if allowedOrigin == "*" {
ctx . Status ( http . StatusOK )
} else if allowedOrigin == "null" {
ctx . Status ( http . StatusForbidden )
} else {
origin := ctx . Req . Header . Get ( "Origin" )
if len ( origin ) > 0 && origin == allowedOrigin {
ctx . Status ( http . StatusOK )
} else {
ctx . Status ( http . StatusForbidden )
}
}
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return
}
}
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username := ctx . Params ( ":username" )
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reponame := strings . TrimSuffix ( ctx . Params ( ":reponame" ) , ".git" )
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if ctx . Query ( "go-get" ) == "1" {
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context . EarlyResponseForGoGetMeta ( ctx )
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return
}
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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
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} 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" )
}
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var accessMode models . AccessMode
if isPull {
accessMode = models . AccessModeRead
} else {
accessMode = models . AccessModeWrite
}
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isWiki := false
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var unitType = models . UnitTypeCode
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if strings . HasSuffix ( reponame , ".wiki" ) {
isWiki = true
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unitType = models . UnitTypeWiki
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reponame = reponame [ : len ( reponame ) - 5 ]
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}
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repo , err := models . GetRepositoryByOwnerAndName ( username , reponame )
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if err != nil {
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ctx . NotFoundOrServerError ( "GetRepositoryByOwnerAndName" , models . IsErrRepoNotExist , err )
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return
}
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// Only public pull don't need auth.
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isPublicPull := ! repo . IsPrivate && isPull
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var (
askAuth = ! isPublicPull || setting . Service . RequireSignInView
authUser * models . User
authUsername string
authPasswd string
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environ [ ] string
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)
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// check access
if askAuth {
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authUsername = ctx . Req . Header . Get ( setting . ReverseProxyAuthUser )
if setting . Service . EnableReverseProxyAuth && len ( authUsername ) > 0 {
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authUser , err = models . GetUserByName ( authUsername )
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if err != nil {
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ctx . HandleText ( 401 , "reverse proxy login error, got error while running GetUserByName" )
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return
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}
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} else {
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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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}
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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 ] )
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if err != nil {
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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 ) {
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ctx . ServerError ( "UserSignIn error: %v" , err )
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return
}
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}
if authUser == nil {
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isUsernameToken := len ( authPasswd ) == 0 || authPasswd == "x-oauth-basic"
// Assume username is token
authToken := authUsername
if ! isUsernameToken {
// Assume password is token
authToken = authPasswd
authUser , err = models . GetUserByName ( authUsername )
if err != nil {
if models . IsErrUserNotExist ( err ) {
ctx . HandleText ( http . StatusUnauthorized , "invalid credentials" )
} else {
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ctx . ServerError ( "GetUserByName" , err )
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}
return
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}
}
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// Assume password is a token.
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token , err := models . GetAccessTokenBySHA ( authToken )
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if err != nil {
if models . IsErrAccessTokenNotExist ( err ) || models . IsErrAccessTokenEmpty ( err ) {
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ctx . HandleText ( http . StatusUnauthorized , "invalid credentials" )
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} else {
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ctx . ServerError ( "GetAccessTokenBySha" , err )
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}
return
}
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if isUsernameToken {
authUser , err = models . GetUserByID ( token . UID )
if err != nil {
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ctx . ServerError ( "GetUserByID" , err )
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return
}
} else if authUser . ID != token . UID {
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ctx . HandleText ( http . StatusUnauthorized , "invalid credentials" )
return
}
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token . UpdatedUnix = util . TimeStampNow ( )
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if err = models . UpdateAccessToken ( token ) ; err != nil {
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ctx . ServerError ( "UpdateAccessToken" , err )
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}
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} else {
_ , err = models . GetTwoFactorByUID ( authUser . ID )
if err == nil {
// TODO: This response should be changed to "invalid credentials" for security reasons once the expectation behind it (creating an app token to authenticate) is properly documented
ctx . HandleText ( http . StatusUnauthorized , "Users with two-factor authentication enabled cannot perform HTTP/HTTPS operations via plain username and password. Please create and use a personal access token on the user settings page" )
return
} else if ! models . IsErrTwoFactorNotEnrolled ( err ) {
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ctx . ServerError ( "IsErrTwoFactorNotEnrolled" , err )
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return
}
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}
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}
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perm , err := models . GetUserRepoPermission ( repo , authUser )
if err != nil {
ctx . ServerError ( "GetUserRepoPermission" , err )
return
}
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if ! perm . CanAccess ( accessMode , unitType ) {
ctx . HandleText ( http . StatusForbidden , "User permission denied" )
return
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}
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if ! isPull && repo . IsMirror {
ctx . HandleText ( http . StatusForbidden , "mirror repository is read-only" )
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return
}
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environ = [ ] string {
models . EnvRepoUsername + "=" + username ,
models . EnvRepoName + "=" + reponame ,
models . EnvPusherName + "=" + authUser . Name ,
models . EnvPusherID + fmt . Sprintf ( "=%d" , authUser . ID ) ,
models . ProtectedBranchRepoID + fmt . Sprintf ( "=%d" , repo . ID ) ,
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}
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if ! authUser . KeepEmailPrivate {
environ = append ( environ , models . EnvPusherEmail + "=" + authUser . Email )
}
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if isWiki {
environ = append ( environ , models . EnvRepoIsWiki + "=true" )
} else {
environ = append ( environ , models . EnvRepoIsWiki + "=false" )
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}
}
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HTTPBackend ( ctx , & serviceConfig {
UploadPack : true ,
ReceivePack : true ,
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Env : environ ,
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} ) ( ctx . Resp , ctx . Req . Request )
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}
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type serviceConfig struct {
UploadPack bool
ReceivePack bool
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Env [ ] string
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}
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type serviceHandler struct {
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cfg * serviceConfig
w http . ResponseWriter
r * http . Request
dir string
file string
environ [ ] string
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}
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 ) 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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}
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type route struct {
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reg * regexp . Regexp
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method string
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handler func ( serviceHandler )
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}
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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 ) )
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return out [ 0 : len ( out ) - 1 ]
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}
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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 err error
var reqBody = h . r . Body
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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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// set this for allow pre-receive and post-receive execute
h . environ = append ( h . environ , "SSH_ORIGINAL_COMMAND=" + service )
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var stderr bytes . Buffer
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cmd := exec . Command ( "git" , service , "--stateless-rpc" , h . dir )
cmd . Dir = h . dir
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if service == "receive-pack" {
cmd . Env = append ( os . Environ ( ) , h . environ ... )
}
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cmd . Stdout = h . w
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cmd . Stdin = reqBody
cmd . Stderr = & stderr
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if err := cmd . Run ( ) ; err != nil {
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log . GitLogger . Error ( 2 , "fail to serve RPC(%s): %v - %v" , service , err , stderr )
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return
}
}
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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 {
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s := strconv . FormatInt ( int64 ( len ( str ) + 4 ) , 16 )
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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 {
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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 ( ) )
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ctx . NotFound ( "HTTPBackend" , err )
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return
}
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route . handler ( serviceHandler { cfg , w , r , dir , file , cfg . Env } )
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return
}
}
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ctx . NotFound ( "HTTPBackend" , nil )
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return
}
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}