syz-cluster/dashboard: share test step artifacts

If the test artifacts are present, let the user download them.

Author: a-nogikh

syz-cluster/dashboard/handler.go

@@ -58,6 +58,7 @@ func (h *dashboardHandler) Mux() *http.ServeMux {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/sessions/{id}/log", errToStatus(h.sessionLog))
 	mux.HandleFunc("/sessions/{id}/test_logs", errToStatus(h.sessionTestLog))
+	mux.HandleFunc("/sessions/{id}/test_artifacts", errToStatus(h.sessionTestArtifacts))
 	mux.HandleFunc("/series/{id}", errToStatus(h.seriesInfo))
 	mux.HandleFunc("/patches/{id}", errToStatus(h.patchContent))
 	mux.HandleFunc("/findings/{id}/{key}", errToStatus(h.findingInfo))
@@ -254,11 +255,24 @@ func (h *dashboardHandler) sessionTestLog(w http.ResponseWriter, r *http.Request
 	if err != nil {
 		return err
 	} else if test == nil {
-		return fmt.Errorf("%w: test log", errNotFound)
+		return fmt.Errorf("%w: test", errNotFound)
 	}
 	return h.streamBlob(w, test.LogURI)
 }
 
+func (h *dashboardHandler) sessionTestArtifacts(w http.ResponseWriter, r *http.Request) error {
+	test, err := h.sessionTestRepo.Get(r.Context(), r.PathValue("id"), r.FormValue("name"))
+	if err != nil {
+		return err
+	} else if test == nil {
+		return fmt.Errorf("%w: test", errNotFound)
+	}
+	filename := fmt.Sprintf("%s_%s.tar.gz", test.SessionID, test.TestName)
+	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
+	w.Header().Set("Content-Type", "application/octet-stream")
+	return h.streamBlob(w, test.ArtifactsArchiveURI)
+}
+
 func (h *dashboardHandler) streamBlob(w http.ResponseWriter, uri string) error {
 	if uri == "" {
 		return nil

syz-cluster/dashboard/templates/series.html

@@ -130,6 +130,9 @@ <h3>Session {{.CreatedAt.Format "2006-01-02"}}</h3>
                         {{if .LogURI}}
                             <a href="/sessions/{{.SessionID}}/test_logs?name={{.TestName}}" class="modal-link-raw">[Log]</a>
                         {{end}}
+                        {{if .ArtifactsArchiveURI}}
+                            <a href="/sessions/{{.SessionID}}/test_artifacts?name={{.TestName}}">[Artifacts]</a>
+                        {{end}}
                     </th>
                 </tr>
                 {{if .Findings}}