Stackdriver: Add new file

pkg/api/pluginproxy/ds_auth_provider.go

+package pluginproxy
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"html/template"
+	"net/http"
+	"net/url"
+	"strings"
+
+	m "github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/plugins"
+	"github.com/grafana/grafana/pkg/util"
+)
+
+func applyRoute(ctx context.Context, req *http.Request, proxyPath string, route *plugins.AppPluginRoute, ds *m.DataSource) {
+	proxyPath = strings.TrimPrefix(proxyPath, route.Path)
+
+	data := templateData{
+		JsonData:       ds.JsonData.Interface().(map[string]interface{}),
+		SecureJsonData: ds.SecureJsonData.Decrypt(),
+	}
+
+	interpolatedURL, err := interpolateString(route.Url, data)
+	if err != nil {
+		logger.Error("Error interpolating proxy url", "error", err)
+		return
+	}
+
+	routeURL, err := url.Parse(interpolatedURL)
+	if err != nil {
+		logger.Error("Error parsing plugin route url", "error", err)
+		return
+	}
+
+	req.URL.Scheme = routeURL.Scheme
+	req.URL.Host = routeURL.Host
+	req.Host = routeURL.Host
+	req.URL.Path = util.JoinUrlFragments(routeURL.Path, proxyPath)
+
+	if err := addHeaders(&req.Header, route, data); err != nil {
+		logger.Error("Failed to render plugin headers", "error", err)
+	}
+
+	tokenProvider := newAccessTokenProvider(ds.Id, route)
+
+	if route.TokenAuth != nil {
+		if token, err := tokenProvider.getAccessToken(data); err != nil {
+			logger.Error("Failed to get access token", "error", err)
+		} else {
+			req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
+		}
+	}
+
+	if route.JwtTokenAuth != nil {
+		if token, err := tokenProvider.getJwtAccessToken(ctx, data); err != nil {
+			logger.Error("Failed to get access token", "error", err)
+		} else {
+			req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
+		}
+	}
+	logger.Info("Requesting", "url", req.URL.String())
+
+}
+
+func interpolateString(text string, data templateData) (string, error) {
+	t, err := template.New("content").Parse(text)
+	if err != nil {
+		return "", fmt.Errorf("could not parse template %s", text)
+	}
+
+	var contentBuf bytes.Buffer
+	err = t.Execute(&contentBuf, data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute template %s", text)
+	}
+
+	return contentBuf.String(), nil
+}
+
+func addHeaders(reqHeaders *http.Header, route *plugins.AppPluginRoute, data templateData) error {
+	for _, header := range route.Headers {
+		interpolated, err := interpolateString(header.Content, data)
+		if err != nil {
+			return err
+		}
+		reqHeaders.Add(header.Name, interpolated)
+	}
+
+	return nil
+}