API: enable proxying datasource calls using the datasource UID (#47634)

* Introduce additional routes

pkg/api/api.go

@@ -322,7 +322,9 @@ func (hs *HTTPServer) registerRoutes() {
 
 		apiRoute.Get("/frontend/settings/", hs.GetFrontendSettings)
 		apiRoute.Any("/datasources/proxy/:id/*", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), hs.ProxyDataSourceRequest)
+		apiRoute.Any("/datasources/proxy/uid/:uid/*", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), hs.ProxyDataSourceRequestWithUID)
 		apiRoute.Any("/datasources/proxy/:id", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), hs.ProxyDataSourceRequest)
+		apiRoute.Any("/datasources/proxy/uid/:uid", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), hs.ProxyDataSourceRequestWithUID)
 		apiRoute.Any("/datasources/:id/resources", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), hs.CallDatasourceResource)
 		apiRoute.Any("/datasources/:id/resources/*", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), hs.CallDatasourceResource)
 		apiRoute.Any("/datasources/:id/health", authorize(reqSignedIn, ac.EvalPermission(datasources.ActionQuery)), routing.Wrap(hs.CheckDatasourceHealth))

pkg/api/dataproxy.go

@@ -5,3 +5,7 @@ import "github.com/grafana/grafana/pkg/models"
 func (hs *HTTPServer) ProxyDataSourceRequest(c *models.ReqContext) {
 	hs.DataProxy.ProxyDataSourceRequest(c)
 }
+
+func (hs *HTTPServer) ProxyDataSourceRequestWithUID(c *models.ReqContext) {
+	hs.DataProxy.ProxyDatasourceRequestWithUID(c)
+}

pkg/services/datasourceproxy/datasourceproxy.go

@@ -18,6 +18,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/oauthtoken"
 	"github.com/grafana/grafana/pkg/services/secrets"
 	"github.com/grafana/grafana/pkg/setting"
+	"github.com/grafana/grafana/pkg/util"
 	"github.com/grafana/grafana/pkg/web"
 )
 
@@ -59,24 +60,47 @@ func (p *DataSourceProxyService) ProxyDataSourceRequest(c *models.ReqContext) {
 	p.ProxyDatasourceRequestWithID(c, id)
 }
 
+func (p *DataSourceProxyService) ProxyDatasourceRequestWithUID(c *models.ReqContext) {
+	c.TimeRequest(metrics.MDataSourceProxyReqTimer)
+
+	dsUID := web.Params(c.Req)[":uid"]
+	if !util.IsValidShortUID(dsUID) {
+		c.JsonApiErr(http.StatusBadRequest, "UID is invalid", nil)
+		return
+	}
+
+	ds, err := p.DataSourceCache.GetDatasourceByUID(c.Req.Context(), dsUID, c.SignedInUser, c.SkipCache)
+	if err != nil {
+		toAPIError(c, err)
+		return
+	}
+	p.proxyDatasourceRequest(c, ds)
+}
+
 func (p *DataSourceProxyService) ProxyDatasourceRequestWithID(c *models.ReqContext, dsID int64) {
 	c.TimeRequest(metrics.MDataSourceProxyReqTimer)
 
 	ds, err := p.DataSourceCache.GetDatasource(c.Req.Context(), dsID, c.SignedInUser, c.SkipCache)
 	if err != nil {
-		if errors.Is(err, models.ErrDataSourceAccessDenied) {
-			c.JsonApiErr(http.StatusForbidden, "Access denied to datasource", err)
-			return
-		}
-		if errors.Is(err, models.ErrDataSourceNotFound) {
-			c.JsonApiErr(http.StatusNotFound, "Unable to find datasource", err)
-			return
-		}
-		c.JsonApiErr(http.StatusInternalServerError, "Unable to load datasource meta data", err)
+		toAPIError(c, err)
+	}
+	p.proxyDatasourceRequest(c, ds)
+}
+
+func toAPIError(c *models.ReqContext, err error) {
+	if errors.Is(err, models.ErrDataSourceAccessDenied) {
+		c.JsonApiErr(http.StatusForbidden, "Access denied to datasource", err)
+		return
+	}
+	if errors.Is(err, models.ErrDataSourceNotFound) {
+		c.JsonApiErr(http.StatusNotFound, "Unable to find datasource", err)
 		return
 	}
+	c.JsonApiErr(http.StatusInternalServerError, "Unable to load datasource meta data", err)
+}
 
-	err = p.PluginRequestValidator.Validate(ds.Url, c.Req)
+func (p *DataSourceProxyService) proxyDatasourceRequest(c *models.ReqContext, ds *models.DataSource) {
+	err := p.PluginRequestValidator.Validate(ds.Url, c.Req)
 	if err != nil {
 		c.JsonApiErr(http.StatusForbidden, "Access denied", err)
 		return
@@ -103,7 +127,7 @@ func (p *DataSourceProxyService) ProxyDatasourceRequestWithID(c *models.ReqConte
 	proxy.HandleRequest()
 }
 
-var proxyPathRegexp = regexp.MustCompile(`^\/api\/datasources\/proxy\/[\d]+\/?`)
+var proxyPathRegexp = regexp.MustCompile(`^\/api\/datasources\/proxy\/([\d]+|uid\/[\w]+)\/?`)
 
 func extractProxyPath(originalRawPath string) string {
 	return proxyPathRegexp.ReplaceAllString(originalRawPath, "")

pkg/services/datasourceproxy/datasourceproxy_test.go

@@ -24,6 +24,18 @@ func TestDataProxy(t *testing.T) {
 				"/api/datasources/proxy/54/api/services/afsd%2Fafsd/operations",
 				"api/services/afsd%2Fafsd/operations",
 			},
+			{
+				"/api/datasources/proxy/uid/26MI0wZ7k",
+				"",
+			},
+			{
+				"/api/datasources/proxy/uid/26MI0wZ7k/some/thing",
+				"some/thing",
+			},
+			{
+				"/api/datasources/proxy/uid/26MI0wZ7k/api/services/afsd%2Fafsd/operations",
+				"api/services/afsd%2Fafsd/operations",
+			},
 		}
 		for _, tc := range testCases {
 			t.Run("Given raw path, should extract expected proxy path", func(t *testing.T) {