agola/internal/services/gitserver/main.go

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// Copyright 2019 Sorint.lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
// See the License for the specific language governing permissions and
// limitations under the License.
package gitserver
import (
"context"
"crypto/tls"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
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handlers "agola.io/agola/internal/git-handler"
slog "agola.io/agola/internal/log"
"agola.io/agola/internal/services/config"
"agola.io/agola/internal/util"
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"github.com/gorilla/mux"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
errors "golang.org/x/xerrors"
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)
var level = zap.NewAtomicLevelAt(zapcore.InfoLevel)
var logger = slog.New(level)
var log = logger.Sugar()
const (
gitSuffix = ".git"
)
func repoPathIsValid(reposDir, repoPath string) (bool, error) {
// a parent cannot end with .git
parts := strings.Split(repoPath, "/")
for _, part := range parts[:len(parts)-1] {
if strings.HasSuffix(part, gitSuffix) {
return false, errors.Errorf("path %q contains a parent directory with .git suffix", repoPath)
}
}
// check that a subdirectory doesn't exists
reposDir, err := filepath.Abs(reposDir)
if err != nil {
return false, err
}
path := repoPath
_, err = os.Stat(path)
if err != nil && !os.IsNotExist(err) {
return false, err
}
if !os.IsNotExist(err) {
// if it exists assume it's valid
return true, nil
}
for {
path = filepath.Dir(path)
if len(path) <= len(reposDir) {
break
}
_, err := os.Stat(path)
if err != nil && !os.IsNotExist(err) {
return false, err
}
// a parent path cannot end with .git
if strings.HasSuffix(path, gitSuffix) {
return false, nil
}
if !os.IsNotExist(err) {
// if a parent exists return not valid
return false, nil
}
}
return true, nil
}
func repoExists(repoAbsPath string) (bool, error) {
_, err := os.Stat(repoAbsPath)
if err != nil && !os.IsNotExist(err) {
return false, err
}
return !os.IsNotExist(err), nil
}
func repoAbsPath(reposDir, repoPath string) (string, bool, error) {
valid, err := repoPathIsValid(reposDir, repoPath)
if err != nil {
return "", false, err
}
if !valid {
return "", false, handlers.ErrWrongRepoPath
}
repoFSPath, err := filepath.Abs(filepath.Join(reposDir, repoPath))
if err != nil {
return "", false, err
}
exists, err := repoExists(repoFSPath)
if err != nil {
return "", false, err
}
return repoFSPath, exists, nil
}
func Matcher(matchRegexp *regexp.Regexp) mux.MatcherFunc {
return func(r *http.Request, rm *mux.RouteMatch) bool {
return matchRegexp.MatchString(r.URL.Path)
}
}
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type Gitserver struct {
c *config.Gitserver
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}
func NewGitserver(ctx context.Context, l *zap.Logger, c *config.Gitserver) (*Gitserver, error) {
if l != nil {
logger = l
}
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if c.Debug {
level.SetLevel(zapcore.DebugLevel)
}
log = logger.Sugar()
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return &Gitserver{
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c: c,
}, nil
}
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func (s *Gitserver) Run(ctx context.Context) error {
gitSmartHandler := handlers.NewGitSmartHandler(logger, s.c.DataDir, true, repoAbsPath, nil)
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fetchFileHandler := handlers.NewFetchFileHandler(logger, s.c.DataDir, repoAbsPath)
router := mux.NewRouter()
router.MatcherFunc(Matcher(handlers.InfoRefsRegExp)).Handler(gitSmartHandler)
router.MatcherFunc(Matcher(handlers.UploadPackRegExp)).Handler(gitSmartHandler)
router.MatcherFunc(Matcher(handlers.ReceivePackRegExp)).Handler(gitSmartHandler)
router.MatcherFunc(Matcher(handlers.FetchFileRegExp)).Handler(fetchFileHandler)
var tlsConfig *tls.Config
if s.c.Web.TLS {
var err error
tlsConfig, err = util.NewTLSConfig(s.c.Web.TLSCertFile, s.c.Web.TLSKeyFile, "", false)
if err != nil {
log.Errorf("err: %+v")
return err
}
}
httpServer := http.Server{
Addr: s.c.Web.ListenAddress,
Handler: router,
TLSConfig: tlsConfig,
}
lerrCh := make(chan error)
go func() {
if !s.c.Web.TLS {
lerrCh <- httpServer.ListenAndServe()
} else {
lerrCh <- httpServer.ListenAndServeTLS("", "")
}
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}()
select {
case <-ctx.Done():
log.Infof("gitserver exiting")
httpServer.Close()
case err := <-lerrCh:
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if err != nil {
log.Errorf("http server listen error: %v", err)
return err
}
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}
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return nil
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}