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