pkg/util: Check errors (#19832)

* pkg/util: Check errors
* pkg/services: DRY up code

pkg/services/rendering/http_mode.go

@@ -25,16 +25,24 @@ var netClient = &http.Client{
 }
 
 func (rs *RenderingService) renderViaHttp(ctx context.Context, opts Opts) (*RenderResult, error) {
-	filePath := rs.getFilePathForNewImage()
+	filePath, err := rs.getFilePathForNewImage()
+	if err != nil {
+		return nil, err
+	}
 
 	rendererUrl, err := url.Parse(rs.Cfg.RendererUrl)
 	if err != nil {
 		return nil, err
 	}
 
+	renderKey, err := rs.getRenderKey(opts.OrgId, opts.UserId, opts.OrgRole)
+	if err != nil {
+		return nil, err
+	}
+
 	queryParams := rendererUrl.Query()
 	queryParams.Add("url", rs.getURL(opts.Path))
-	queryParams.Add("renderKey", rs.getRenderKey(opts.OrgId, opts.UserId, opts.OrgRole))
+	queryParams.Add("renderKey", renderKey)
 	queryParams.Add("width", strconv.Itoa(opts.Width))
 	queryParams.Add("height", strconv.Itoa(opts.Height))
 	queryParams.Add("domain", rs.domain)

pkg/services/rendering/phantomjs.go

@@ -30,9 +30,15 @@ func (rs *RenderingService) renderViaPhantomJS(ctx context.Context, opts Opts) (
 	}
 
 	scriptPath, _ := filepath.Abs(filepath.Join(rs.Cfg.PhantomDir, "render.js"))
-	pngPath := rs.getFilePathForNewImage()
+	pngPath, err := rs.getFilePathForNewImage()
+	if err != nil {
+		return nil, err
+	}
 
-	renderKey := middleware.AddRenderAuthKey(opts.OrgId, opts.UserId, opts.OrgRole)
+	renderKey, err := middleware.AddRenderAuthKey(opts.OrgId, opts.UserId, opts.OrgRole)
+	if err != nil {
+		return nil, err
+	}
 	defer middleware.RemoveRenderAuthKey(renderKey)
 
 	phantomDebugArg := "--debug=false"

pkg/services/rendering/plugin_mode.go

@@ -69,7 +69,15 @@ func (rs *RenderingService) watchAndRestartPlugin(ctx context.Context) error {
 }
 
 func (rs *RenderingService) renderViaPlugin(ctx context.Context, opts Opts) (*RenderResult, error) {
-	pngPath := rs.getFilePathForNewImage()
+	pngPath, err := rs.getFilePathForNewImage()
+	if err != nil {
+		return nil, err
+	}
+
+	renderKey, err := rs.getRenderKey(opts.OrgId, opts.UserId, opts.OrgRole)
+	if err != nil {
+		return nil, err
+	}
 
 	rsp, err := rs.grpcPlugin.Render(ctx, &pluginModel.RenderRequest{
 		Url:       rs.getURL(opts.Path),
@@ -77,16 +85,14 @@ func (rs *RenderingService) renderViaPlugin(ctx context.Context, opts Opts) (*Re
 		Height:    int32(opts.Height),
 		FilePath:  pngPath,
 		Timeout:   int32(opts.Timeout.Seconds()),
-		RenderKey: rs.getRenderKey(opts.OrgId, opts.UserId, opts.OrgRole),
+		RenderKey: renderKey,
 		Encoding:  opts.Encoding,
 		Timezone:  isoTimeOffsetToPosixTz(opts.Timezone),
 		Domain:    rs.domain,
 	})
-
 	if err != nil {
 		return nil, err
 	}
-
 	if rsp.Error != "" {
 		return nil, fmt.Errorf("Rendering failed: %v", rsp.Error)
 	}

pkg/services/rendering/rendering.go

@@ -112,9 +112,17 @@ func (rs *RenderingService) Render(ctx context.Context, opts Opts) (*RenderResul
 	return nil, fmt.Errorf("No renderer found")
 }
 
-func (rs *RenderingService) getFilePathForNewImage() string {
-	pngPath, _ := filepath.Abs(filepath.Join(rs.Cfg.ImagesDir, util.GetRandomString(20)))
-	return pngPath + ".png"
+func (rs *RenderingService) getFilePathForNewImage() (string, error) {
+	rand, err := util.GetRandomString(20)
+	if err != nil {
+		return "", err
+	}
+	pngPath, err := filepath.Abs(filepath.Join(rs.Cfg.ImagesDir, rand))
+	if err != nil {
+		return "", err
+	}
+
+	return pngPath + ".png", nil
 }
 
 func (rs *RenderingService) getURL(path string) string {
@@ -131,6 +139,6 @@ func (rs *RenderingService) getURL(path string) string {
 	return fmt.Sprintf("%s://%s:%s/%s&render=1", setting.Protocol, rs.domain, setting.HttpPort, path)
 }
 
-func (rs *RenderingService) getRenderKey(orgId, userId int64, orgRole models.RoleType) string {
+func (rs *RenderingService) getRenderKey(orgId, userId int64, orgRole models.RoleType) (string, error) {
 	return middleware.AddRenderAuthKey(orgId, userId, orgRole)
 }