116 lines
3 KiB
Go
116 lines
3 KiB
Go
package dependencyproxy
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"gitlab.com/gitlab-org/labkit/log"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper/httptransport"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/senddata"
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)
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var httpClient = &http.Client{
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Transport: httptransport.New(),
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}
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type Injector struct {
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senddata.Prefix
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uploadHandler http.Handler
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}
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type entryParams struct {
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Url string
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Header http.Header
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}
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type nullResponseWriter struct {
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header http.Header
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status int
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}
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func (nullResponseWriter) Write(p []byte) (int, error) {
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return len(p), nil
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}
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func (w *nullResponseWriter) Header() http.Header {
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return w.header
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}
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func (w *nullResponseWriter) WriteHeader(status int) {
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if w.status == 0 {
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w.status = status
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}
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}
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func NewInjector() *Injector {
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return &Injector{Prefix: "send-dependency:"}
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}
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func (p *Injector) SetUploadHandler(uploadHandler http.Handler) {
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p.uploadHandler = uploadHandler
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}
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func (p *Injector) Inject(w http.ResponseWriter, r *http.Request, sendData string) {
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dependencyResponse, err := p.fetchUrl(r.Context(), sendData)
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if err != nil {
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helper.Fail500(w, r, err)
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return
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}
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defer dependencyResponse.Body.Close()
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if dependencyResponse.StatusCode >= 400 {
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w.WriteHeader(dependencyResponse.StatusCode)
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io.Copy(w, dependencyResponse.Body)
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return
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}
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w.Header().Set("Content-Length", dependencyResponse.Header.Get("Content-Length"))
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teeReader := io.TeeReader(dependencyResponse.Body, w)
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saveFileRequest, err := http.NewRequestWithContext(r.Context(), "POST", r.URL.String()+"/upload", teeReader)
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if err != nil {
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helper.Fail500(w, r, fmt.Errorf("dependency proxy: failed to create request: %w", err))
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}
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saveFileRequest.Header = helper.HeaderClone(r.Header)
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// forward headers from dependencyResponse to rails and client
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for key, values := range dependencyResponse.Header {
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saveFileRequest.Header.Del(key)
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w.Header().Del(key)
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for _, value := range values {
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saveFileRequest.Header.Add(key, value)
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w.Header().Add(key, value)
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}
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}
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// workhorse hijack overwrites the Content-Type header, but we need this header value
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saveFileRequest.Header.Set("Workhorse-Proxy-Content-Type", dependencyResponse.Header.Get("Content-Type"))
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saveFileRequest.ContentLength = dependencyResponse.ContentLength
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nrw := &nullResponseWriter{header: make(http.Header)}
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p.uploadHandler.ServeHTTP(nrw, saveFileRequest)
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if nrw.status != http.StatusOK {
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fields := log.Fields{"code": nrw.status}
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helper.Fail500WithFields(nrw, r, fmt.Errorf("dependency proxy: failed to upload file"), fields)
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}
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}
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func (p *Injector) fetchUrl(ctx context.Context, sendData string) (*http.Response, error) {
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var params entryParams
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if err := p.Unpack(¶ms, sendData); err != nil {
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return nil, fmt.Errorf("dependency proxy: unpack sendData: %v", err)
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}
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r, err := http.NewRequestWithContext(ctx, "GET", params.Url, nil)
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if err != nil {
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return nil, fmt.Errorf("dependency proxy: failed to fetch dependency: %v", err)
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}
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r.Header = params.Header
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return httpClient.Do(r)
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}
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