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|
package lfstransfer
import (
"context"
"encoding/base64"
"fmt"
"github.com/charmbracelet/git-lfs-transfer/transfer"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/command"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/command/commandargs"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/command/readwriter"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/command/shared/accessverifier"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/command/shared/disallowedcommand"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/config"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/gitlabnet/lfsauthenticate"
"gitlab.com/gitlab-org/labkit/log"
)
var (
capabilities = []string{
"version=1",
}
)
type Command struct {
Config *config.Config
Args *commandargs.Shell
ReadWriter *readwriter.ReadWriter
}
func (c *Command) Execute(ctx context.Context) (context.Context, error) {
args := c.Args.SshArgs
if len(args) != 3 {
return ctx, disallowedcommand.Error
}
// e.g. git-lfs-transfer user/repo.git download
repo := args[1]
operation := args[2]
action, err := actionFromOperation(operation)
if err != nil {
return ctx, err
}
accessResponse, err := c.verifyAccess(ctx, action, repo)
if err != nil {
return ctx, err
}
ctxWithLogData := context.WithValue(ctx, "logData", command.NewLogData(
accessResponse.Gitaly.Repo.GlProjectPath,
accessResponse.Username,
))
auth, err := c.authenticate(ctx, operation, repo, accessResponse.UserId)
if err != nil {
return ctxWithLogData, err
}
logger := NewWrappedLoggerForGitLFSTransfer(ctxWithLogData)
backend, err := NewGitlabBackend(ctxWithLogData, c.Config, c.Args, auth)
if err != nil {
return ctxWithLogData, err
}
handler := transfer.NewPktline(c.ReadWriter.In, c.ReadWriter.Out, logger)
for _, cap := range capabilities {
if err := handler.WritePacketText(cap); err != nil {
log.WithContextFields(ctxWithLogData, log.Fields{"capability": cap}).WithError(err).Error("error sending capability")
}
}
if err := handler.WriteFlush(); err != nil {
log.WithContextFields(ctxWithLogData, log.Fields{}).WithError(err).Error("error flushing capabilities")
}
p := transfer.NewProcessor(handler, backend, logger)
defer log.WithContextFields(ctxWithLogData, log.Fields{}).Info("done processing commands")
switch operation {
case transfer.DownloadOperation:
return ctxWithLogData, p.ProcessCommands(transfer.DownloadOperation)
case transfer.UploadOperation:
return ctxWithLogData, p.ProcessCommands(transfer.UploadOperation)
default:
return ctxWithLogData, fmt.Errorf("unknown operation %q", operation)
}
}
func actionFromOperation(operation string) (commandargs.CommandType, error) {
var action commandargs.CommandType
switch operation {
case transfer.DownloadOperation:
action = commandargs.UploadPack
case transfer.UploadOperation:
action = commandargs.ReceivePack
default:
return "", disallowedcommand.Error
}
return action, nil
}
func (c *Command) verifyAccess(ctx context.Context, action commandargs.CommandType, repo string) (*accessverifier.Response, error) {
cmd := accessverifier.Command{c.Config, c.Args, c.ReadWriter}
return cmd.Verify(ctx, action, repo)
}
func (c *Command) authenticate(ctx context.Context, operation string, repo string, userId string) (*GitlabAuthentication, error) {
client, err := lfsauthenticate.NewClient(c.Config, c.Args)
if err != nil {
return nil, err
}
response, err := client.Authenticate(ctx, operation, repo, userId)
if err != nil {
return nil, err
}
basicAuth := fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", response.Username, response.LfsToken))))
return &GitlabAuthentication{
href: fmt.Sprintf("%s/info/lfs", response.RepoPath),
auth: basicAuth,
}, nil
}
|
