[VC-36032] Set User-Agent header containing the agent version in all HTTP requests (#631)

* Allow cancellation of the data upload request when using Venafi Cloud with private key authentication
* Set User-Agent header containing the agent version in all HTTP requests

This will make it easier to diagnose problems by allowing platform teams to
parse HTTP server logs or intermediate HTTP proxy logs and know which version of
the agent has made the request.

* Fix the config tests

Signed-off-by: Richard Wall <richard.wall@venafi.com>

Author: wallrj

pkg/agent/config_test.go

@@ -178,7 +178,7 @@ func Test_ValidateAndCombineConfig(t *testing.T) {
 
 		// The log line printed by pflag is not captured by the log recorder.
 		assert.Equal(t, testutil.Undent(`
-			INFO Using the Jetstack Secure OAuth auth mode since --credentials-file was specified without --venafi-cloud.
+			INFO Authentication mode mode="Jetstack Secure OAuth" reason="--credentials-file was specified without --venafi-cloud"
 			INFO Using period from config period="1h0m0s"
 		`), b.String())
 	})

pkg/client/client_api_token.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/jetstack/preflight/api"
+	"github.com/jetstack/preflight/pkg/version"
 	"k8s.io/client-go/transport"
 )
 
@@ -90,6 +91,7 @@ func (c *APITokenClient) Post(ctx context.Context, path string, body io.Reader)
 
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", c.apiToken))
+	req.Header.Set("User-Agent", fmt.Sprintf("venafi-kubernetes-agent/%s", version.PreflightVersion))
 
 	return c.client.Do(req)
 }

pkg/client/client_oauth.go

@@ -17,6 +17,7 @@ import (
 	"k8s.io/client-go/transport"
 
 	"github.com/jetstack/preflight/api"
+	"github.com/jetstack/preflight/pkg/version"
 )
 
 type (
@@ -151,6 +152,7 @@ func (c *OAuthClient) Post(ctx context.Context, path string, body io.Reader) (*h
 	}
 
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", fmt.Sprintf("venafi-kubernetes-agent/%s", version.PreflightVersion))
 
 	if len(token.bearer) > 0 {
 		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.bearer))
@@ -188,6 +190,7 @@ func (c *OAuthClient) renewAccessToken(ctx context.Context) error {
 		return errors.WithStack(err)
 	}
 	req.Header.Add("content-type", "application/x-www-form-urlencoded")
+	req.Header.Set("User-Agent", fmt.Sprintf("venafi-kubernetes-agent/%s", version.PreflightVersion))
 
 	res, err := http.DefaultClient.Do(req)
 	if err != nil {

pkg/client/client_venafi_cloud.go

@@ -30,6 +30,7 @@ import (
 	"k8s.io/client-go/transport"
 
 	"github.com/jetstack/preflight/api"
+	"github.com/jetstack/preflight/pkg/version"
 )
 
 type (
@@ -265,13 +266,14 @@ func (c *VenafiCloudClient) Post(ctx context.Context, path string, body io.Reade
 		return nil, err
 	}
 
-	req, err := http.NewRequest(http.MethodPost, fullURL(c.baseURL, path), body)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fullURL(c.baseURL, path), body)
 	if err != nil {
 		return nil, err
 	}
 
 	req.Header.Set("Accept", "application/json")
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", fmt.Sprintf("venafi-kubernetes-agent/%s", version.PreflightVersion))
 
 	if len(token.accessToken) > 0 {
 		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.accessToken))
@@ -314,6 +316,7 @@ func (c *VenafiCloudClient) updateAccessToken(ctx context.Context) error {
 
 	request.Header.Add("Content-Type", "application/x-www-form-urlencoded")
 	request.Header.Add("Content-Length", strconv.Itoa(len(encoded)))
+	request.Header.Set("User-Agent", fmt.Sprintf("venafi-kubernetes-agent/%s", version.PreflightVersion))
 
 	now := time.Now()
 	accessToken := accessTokenInformation{}