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package upload
import (
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/api"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/filestore"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper"
)
type PreAuthorizer interface {
PreAuthorizeHandler(next api.HandleFunc, suffix string) http.Handler
}
// Verifier allows to check an upload before sending it to rails
type Verifier interface {
// Verify can abort the upload returning an error
Verify(handler *filestore.FileHandler) error
}
// Preparer allows to customize BodyUploader configuration
type Preparer interface {
// Prepare converts api.Response into a *SaveFileOpts, it can optionally return an Verifier that will be
// invoked after the real upload, before the finalization with rails
Prepare(a *api.Response) (*filestore.SaveFileOpts, Verifier, error)
}
type DefaultPreparer struct{}
func (s *DefaultPreparer) Prepare(a *api.Response) (*filestore.SaveFileOpts, Verifier, error) {
opts, err := filestore.GetOpts(a)
return opts, nil, err
}
// BodyUploader is an http.Handler that perform a pre authorization call to rails before hijacking the request body and
// uploading it.
// Providing an Preparer allows to customize the upload process
func BodyUploader(rails PreAuthorizer, h http.Handler, p Preparer) http.Handler {
return rails.PreAuthorizeHandler(func(w http.ResponseWriter, r *http.Request, a *api.Response) {
opts, verifier, err := p.Prepare(a)
if err != nil {
helper.Fail500(w, r, fmt.Errorf("BodyUploader: preparation failed: %v", err))
return
}
fh, err := filestore.SaveFileFromReader(r.Context(), r.Body, r.ContentLength, opts)
if err != nil {
helper.Fail500(w, r, fmt.Errorf("BodyUploader: upload failed: %v", err))
return
}
if verifier != nil {
if err := verifier.Verify(fh); err != nil {
helper.Fail500(w, r, fmt.Errorf("BodyUploader: verification failed: %v", err))
return
}
}
data := url.Values{}
fields, err := fh.GitLabFinalizeFields("file")
if err != nil {
helper.Fail500(w, r, fmt.Errorf("BodyUploader: finalize fields failed: %v", err))
return
}
for k, v := range fields {
data.Set(k, v)
}
// Hijack body
body := data.Encode()
r.Body = ioutil.NopCloser(strings.NewReader(body))
r.ContentLength = int64(len(body))
r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
sft := SavedFileTracker{Request: r}
sft.Track("file", fh.LocalPath)
if err := sft.Finalize(r.Context()); err != nil {
helper.Fail500(w, r, fmt.Errorf("BodyUploader: finalize failed: %v", err))
return
}
// And proxy the request
h.ServeHTTP(w, r)
}, "/authorize")
}
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