mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-22 12:54:53 -05:00
531 lines
12 KiB
Go
531 lines
12 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package repo
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import (
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"bytes"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/gogits/gogs/models"
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"github.com/gogits/gogs/modules/base"
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"github.com/gogits/gogs/modules/log"
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"github.com/gogits/gogs/modules/middleware"
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"github.com/gogits/gogs/modules/setting"
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)
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func basicEncode(username, password string) string {
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auth := username + ":" + password
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return base64.StdEncoding.EncodeToString([]byte(auth))
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}
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func basicDecode(encoded string) (user string, name string, err error) {
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var s []byte
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s, err = base64.StdEncoding.DecodeString(encoded)
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if err != nil {
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return user, name, err
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}
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a := strings.Split(string(s), ":")
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if len(a) == 2 {
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user, name = a[0], a[1]
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} else {
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err = errors.New("decode failed")
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}
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return user, name, err
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}
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func authRequired(ctx *middleware.Context) {
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ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=\".\"")
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ctx.Data["ErrorMsg"] = "no basic auth and digit auth"
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ctx.HTML(401, base.TplName("status/401"))
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}
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func Http(ctx *middleware.Context) {
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username := ctx.Params(":username")
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reponame := ctx.Params(":reponame")
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if strings.HasSuffix(reponame, ".git") {
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reponame = reponame[:len(reponame)-4]
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}
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var isPull bool
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service := ctx.Query("service")
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if service == "git-receive-pack" ||
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strings.HasSuffix(ctx.Req.URL.Path, "git-receive-pack") {
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isPull = false
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} else if service == "git-upload-pack" ||
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strings.HasSuffix(ctx.Req.URL.Path, "git-upload-pack") {
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isPull = true
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} else {
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isPull = (ctx.Req.Method == "GET")
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}
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repoUser, err := models.GetUserByName(username)
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if err != nil {
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if err == models.ErrUserNotExist {
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ctx.Handle(404, "GetUserByName", nil)
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} else {
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ctx.Handle(500, "GetUserByName", err)
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}
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return
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}
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repo, err := models.GetRepositoryByName(repoUser.Id, reponame)
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if err != nil {
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if err == models.ErrRepoNotExist {
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ctx.Handle(404, "GetRepositoryByName", nil)
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} else {
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ctx.Handle(500, "GetRepositoryByName", err)
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}
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return
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}
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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
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var authUser *models.User
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var authUsername, passwd string
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// check access
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if askAuth {
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baHead := ctx.Req.Header.Get("Authorization")
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if baHead == "" {
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authRequired(ctx)
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return
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}
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auths := strings.Fields(baHead)
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// currently check basic auth
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// TODO: support digit auth
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if len(auths) != 2 || auths[0] != "Basic" {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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}
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authUsername, passwd, err = basicDecode(auths[1])
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if err != nil {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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}
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authUser, err = models.GetUserByName(authUsername)
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if err != nil {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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}
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newUser := &models.User{Passwd: passwd, Salt: authUser.Salt}
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newUser.EncodePasswd()
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if authUser.Passwd != newUser.Passwd {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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}
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if !isPublicPull {
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var tp = models.WRITABLE
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if isPull {
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tp = models.READABLE
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}
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has, err := models.HasAccess(authUsername, username+"/"+reponame, tp)
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if err != nil {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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} else if !has {
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if tp == models.READABLE {
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has, err = models.HasAccess(authUsername, username+"/"+reponame, models.WRITABLE)
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if err != nil || !has {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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}
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} else {
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ctx.Handle(401, "no basic auth and digit auth", nil)
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return
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}
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}
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}
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}
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var f func(rpc string, input []byte)
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f = func(rpc string, input []byte) {
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if rpc == "receive-pack" {
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var lastLine int64 = 0
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for {
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head := input[lastLine : lastLine+2]
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if head[0] == '0' && head[1] == '0' {
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size, err := strconv.ParseInt(string(input[lastLine+2:lastLine+4]), 16, 32)
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if err != nil {
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log.Error(4, "%v", err)
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return
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}
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if size == 0 {
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//fmt.Println(string(input[lastLine:]))
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break
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}
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line := input[lastLine : lastLine+size]
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idx := bytes.IndexRune(line, '\000')
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if idx > -1 {
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line = line[:idx]
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}
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fields := strings.Fields(string(line))
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if len(fields) >= 3 {
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oldCommitId := fields[0][4:]
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newCommitId := fields[1]
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refName := fields[2]
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models.Update(refName, oldCommitId, newCommitId, authUsername, username, reponame, authUser.Id)
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}
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lastLine = lastLine + size
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} else {
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break
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}
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}
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}
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}
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config := Config{setting.RepoRootPath, "git", true, true, f}
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handler := HttpBackend(&config)
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handler(ctx.Resp, ctx.Req)
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}
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type route struct {
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cr *regexp.Regexp
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method string
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handler func(handler)
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}
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type Config struct {
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ReposRoot string
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GitBinPath string
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UploadPack bool
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ReceivePack bool
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OnSucceed func(rpc string, input []byte)
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}
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type handler struct {
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*Config
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w http.ResponseWriter
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r *http.Request
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Dir string
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File string
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}
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var routes = []route{
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{regexp.MustCompile("(.*?)/git-upload-pack$"), "POST", serviceUploadPack},
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{regexp.MustCompile("(.*?)/git-receive-pack$"), "POST", serviceReceivePack},
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{regexp.MustCompile("(.*?)/info/refs$"), "GET", getInfoRefs},
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{regexp.MustCompile("(.*?)/HEAD$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/info/alternates$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/info/http-alternates$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/info/packs$"), "GET", getInfoPacks},
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{regexp.MustCompile("(.*?)/objects/info/[^/]*$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/[0-9a-f]{2}/[0-9a-f]{38}$"), "GET", getLooseObject},
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{regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.pack$"), "GET", getPackFile},
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{regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.idx$"), "GET", getIdxFile},
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}
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// Request handling function
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func HttpBackend(config *Config) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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for _, route := range routes {
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if m := route.cr.FindStringSubmatch(r.URL.Path); m != nil {
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if route.method != r.Method {
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renderMethodNotAllowed(w, r)
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return
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}
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file := strings.Replace(r.URL.Path, m[1]+"/", "", 1)
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dir, err := getGitDir(config, m[1])
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if err != nil {
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log.GitLogger.Error(4, err.Error())
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renderNotFound(w)
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return
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}
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hr := handler{config, w, r, dir, file}
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route.handler(hr)
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return
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}
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}
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renderNotFound(w)
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return
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}
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}
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// Actual command handling functions
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func serviceUploadPack(hr handler) {
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serviceRpc("upload-pack", hr)
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}
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func serviceReceivePack(hr handler) {
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serviceRpc("receive-pack", hr)
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}
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func serviceRpc(rpc string, hr handler) {
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w, r, dir := hr.w, hr.r, hr.Dir
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access := hasAccess(r, hr.Config, dir, rpc, true)
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if access == false {
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renderNoAccess(w)
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return
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}
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w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-result", rpc))
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w.WriteHeader(http.StatusOK)
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var input []byte
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var br io.Reader
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if hr.Config.OnSucceed != nil {
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input, _ = ioutil.ReadAll(r.Body)
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br = bytes.NewReader(input)
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} else {
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br = r.Body
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}
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args := []string{rpc, "--stateless-rpc", dir}
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cmd := exec.Command(hr.Config.GitBinPath, args...)
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cmd.Dir = dir
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cmd.Stdout = w
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cmd.Stdin = br
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err := cmd.Run()
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if err != nil {
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log.GitLogger.Error(4, err.Error())
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return
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}
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if hr.Config.OnSucceed != nil {
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hr.Config.OnSucceed(rpc, input)
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}
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}
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func getInfoRefs(hr handler) {
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w, r, dir := hr.w, hr.r, hr.Dir
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serviceName := getServiceType(r)
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access := hasAccess(r, hr.Config, dir, serviceName, false)
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if access {
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args := []string{serviceName, "--stateless-rpc", "--advertise-refs", "."}
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refs := gitCommand(hr.Config.GitBinPath, dir, args...)
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hdrNocache(w)
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w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-advertisement", serviceName))
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w.WriteHeader(http.StatusOK)
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w.Write(packetWrite("# service=git-" + serviceName + "\n"))
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w.Write(packetFlush())
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w.Write(refs)
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} else {
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updateServerInfo(hr.Config.GitBinPath, dir)
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hdrNocache(w)
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sendFile("text/plain; charset=utf-8", hr)
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}
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}
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func getInfoPacks(hr handler) {
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hdrCacheForever(hr.w)
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sendFile("text/plain; charset=utf-8", hr)
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}
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func getLooseObject(hr handler) {
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hdrCacheForever(hr.w)
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sendFile("application/x-git-loose-object", hr)
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}
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func getPackFile(hr handler) {
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hdrCacheForever(hr.w)
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sendFile("application/x-git-packed-objects", hr)
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}
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func getIdxFile(hr handler) {
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hdrCacheForever(hr.w)
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sendFile("application/x-git-packed-objects-toc", hr)
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}
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func getTextFile(hr handler) {
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hdrNocache(hr.w)
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sendFile("text/plain", hr)
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}
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// Logic helping functions
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func sendFile(contentType string, hr handler) {
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w, r := hr.w, hr.r
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reqFile := path.Join(hr.Dir, hr.File)
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//fmt.Println("sendFile:", reqFile)
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f, err := os.Stat(reqFile)
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if os.IsNotExist(err) {
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renderNotFound(w)
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return
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}
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w.Header().Set("Content-Type", contentType)
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w.Header().Set("Content-Length", fmt.Sprintf("%d", f.Size()))
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w.Header().Set("Last-Modified", f.ModTime().Format(http.TimeFormat))
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http.ServeFile(w, r, reqFile)
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}
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func getGitDir(config *Config, fPath string) (string, error) {
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root := config.ReposRoot
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if root == "" {
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cwd, err := os.Getwd()
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if err != nil {
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log.GitLogger.Error(4, err.Error())
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return "", err
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}
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root = cwd
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}
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if !strings.HasSuffix(fPath, ".git") {
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fPath = fPath + ".git"
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}
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f := filepath.Join(root, fPath)
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if _, err := os.Stat(f); os.IsNotExist(err) {
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return "", err
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}
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return f, nil
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}
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func getServiceType(r *http.Request) string {
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serviceType := r.FormValue("service")
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if s := strings.HasPrefix(serviceType, "git-"); !s {
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return ""
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}
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return strings.Replace(serviceType, "git-", "", 1)
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}
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func hasAccess(r *http.Request, config *Config, dir string, rpc string, checkContentType bool) bool {
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if checkContentType {
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if r.Header.Get("Content-Type") != fmt.Sprintf("application/x-git-%s-request", rpc) {
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return false
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}
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}
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if !(rpc == "upload-pack" || rpc == "receive-pack") {
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return false
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}
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if rpc == "receive-pack" {
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return config.ReceivePack
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}
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if rpc == "upload-pack" {
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return config.UploadPack
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}
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return getConfigSetting(config.GitBinPath, rpc, dir)
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}
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func getConfigSetting(gitBinPath, serviceName string, dir string) bool {
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serviceName = strings.Replace(serviceName, "-", "", -1)
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setting := getGitConfig(gitBinPath, "http."+serviceName, dir)
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if serviceName == "uploadpack" {
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return setting != "false"
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}
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return setting == "true"
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}
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func getGitConfig(gitBinPath, configName string, dir string) string {
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args := []string{"config", configName}
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out := string(gitCommand(gitBinPath, dir, args...))
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return out[0 : len(out)-1]
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}
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func updateServerInfo(gitBinPath, dir string) []byte {
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args := []string{"update-server-info"}
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return gitCommand(gitBinPath, dir, args...)
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}
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func gitCommand(gitBinPath, dir string, args ...string) []byte {
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command := exec.Command(gitBinPath, args...)
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command.Dir = dir
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out, err := command.Output()
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if err != nil {
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log.GitLogger.Error(4, err.Error())
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}
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return out
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}
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// HTTP error response handling functions
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func renderMethodNotAllowed(w http.ResponseWriter, r *http.Request) {
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if r.Proto == "HTTP/1.1" {
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w.WriteHeader(http.StatusMethodNotAllowed)
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w.Write([]byte("Method Not Allowed"))
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} else {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Bad Request"))
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}
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}
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func renderNotFound(w http.ResponseWriter) {
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w.WriteHeader(http.StatusNotFound)
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w.Write([]byte("Not Found"))
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}
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func renderNoAccess(w http.ResponseWriter) {
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w.WriteHeader(http.StatusForbidden)
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w.Write([]byte("Forbidden"))
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}
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// Packet-line handling function
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func packetFlush() []byte {
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return []byte("0000")
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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 {
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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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// Header writing functions
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func hdrNocache(w http.ResponseWriter) {
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w.Header().Set("Expires", "Fri, 01 Jan 1980 00:00:00 GMT")
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w.Header().Set("Pragma", "no-cache")
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w.Header().Set("Cache-Control", "no-cache, max-age=0, must-revalidate")
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}
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func hdrCacheForever(w http.ResponseWriter) {
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now := time.Now().Unix()
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expires := now + 31536000
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w.Header().Set("Date", fmt.Sprintf("%d", now))
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w.Header().Set("Expires", fmt.Sprintf("%d", expires))
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w.Header().Set("Cache-Control", "public, max-age=31536000")
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}
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