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package lfsauthenticate
import (
"encoding/base64"
"encoding/json"
"fmt"
"gitlab.com/gitlab-org/gitlab-shell/internal/command/commandargs"
"gitlab.com/gitlab-org/gitlab-shell/internal/command/readwriter"
"gitlab.com/gitlab-org/gitlab-shell/internal/command/shared/accessverifier"
"gitlab.com/gitlab-org/gitlab-shell/internal/command/shared/disallowedcommand"
"gitlab.com/gitlab-org/gitlab-shell/internal/config"
"gitlab.com/gitlab-org/gitlab-shell/internal/gitlabnet/lfsauthenticate"
)
const (
downloadOperation = "download"
uploadOperation = "upload"
)
type Command struct {
Config *config.Config
Args *commandargs.Shell
ReadWriter *readwriter.ReadWriter
}
type PayloadHeader struct {
Auth string `json:"Authorization"`
}
type Payload struct {
Header PayloadHeader `json:"header"`
Href string `json:"href"`
ExpiresIn int `json:"expires_in,omitempty"`
}
func (c *Command) Execute() error {
args := c.Args.SshArgs
if len(args) < 3 {
return disallowedcommand.Error
}
// e.g. git-lfs-authenticate user/repo.git download
repo := args[1]
operation := args[2]
action, err := actionFromOperation(operation)
if err != nil {
return err
}
accessResponse, err := c.verifyAccess(action, repo)
if err != nil {
return err
}
payload, err := c.authenticate(operation, repo, accessResponse.UserId)
if err != nil {
// return nothing just like Ruby's GitlabShell#lfs_authenticate does
return nil
}
fmt.Fprintf(c.ReadWriter.Out, "%s\n", payload)
return nil
}
func actionFromOperation(operation string) (commandargs.CommandType, error) {
var action commandargs.CommandType
switch operation {
case downloadOperation:
action = commandargs.UploadPack
case uploadOperation:
action = commandargs.ReceivePack
default:
return "", disallowedcommand.Error
}
return action, nil
}
func (c *Command) verifyAccess(action commandargs.CommandType, repo string) (*accessverifier.Response, error) {
cmd := accessverifier.Command{c.Config, c.Args, c.ReadWriter}
return cmd.Verify(action, repo)
}
func (c *Command) authenticate(operation string, repo, userId string) ([]byte, error) {
client, err := lfsauthenticate.NewClient(c.Config, c.Args)
if err != nil {
return nil, err
}
response, err := client.Authenticate(operation, repo, userId)
if err != nil {
return nil, err
}
basicAuth := base64.StdEncoding.EncodeToString([]byte(response.Username + ":" + response.LfsToken))
payload := &Payload{
Header: PayloadHeader{Auth: "Basic " + basicAuth},
Href: response.RepoPath + "/info/lfs",
ExpiresIn: response.ExpiresIn,
}
return json.Marshal(payload)
}
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