Adding output of which envvars are missing in Cloudflare and Azure (#537)

* Adding output of which envvars are missing in Cloudflare dns provider

* go fmt, duh

* Fixing & adding test(s)

* Adding azure missing env vars checking

* Fixing test

* Doh, fixing up expected output

providers/dns/azure/azure.go

@@ -28,7 +28,7 @@ type DNSProvider struct {
 	tenantId       string
 	resourceGroup  string
 
-	context        context.Context
+	context context.Context
 }
 
 // NewDNSProvider returns a DNSProvider instance configured for azure.
@@ -47,7 +47,13 @@ func NewDNSProvider() (*DNSProvider, error) {
 // DNSProvider instance configured for azure.
 func NewDNSProviderCredentials(clientId, clientSecret, subscriptionId, tenantId, resourceGroup string) (*DNSProvider, error) {
 	if clientId == "" || clientSecret == "" || subscriptionId == "" || tenantId == "" || resourceGroup == "" {
-		return nil, fmt.Errorf("Azure configuration missing")
+		missingEnvVars := []string{}
+		for _, envVar := range []string{"AZURE_CLIENT_ID", "AZURE_CLIENT_SECRET", "AZURE_SUBSCRIPTION_ID", "AZURE_TENANT_ID", "AZURE_RESOURCE_GROUP"} {
+			if os.Getenv(envVar) == "" {
+				missingEnvVars = append(missingEnvVars, envVar)
+			}
+		}
+		return nil, fmt.Errorf("Azure configuration missing: %s", strings.Join(missingEnvVars, ","))
 	}
 
 	return &DNSProvider{
@@ -57,7 +63,7 @@ func NewDNSProviderCredentials(clientId, clientSecret, subscriptionId, tenantId,
 		tenantId:       tenantId,
 		resourceGroup:  resourceGroup,
 		// TODO: A timeout can be added here for cancellation purposes.
-		context:        context.Background(),
+		context: context.Background(),
 	}, nil
 }
 

providers/dns/azure/azure_test.go

@@ -58,7 +58,7 @@ func TestNewDNSProviderValidEnv(t *testing.T) {
 func TestNewDNSProviderMissingCredErr(t *testing.T) {
 	os.Setenv("AZURE_SUBSCRIPTION_ID", "")
 	_, err := NewDNSProvider()
-	assert.EqualError(t, err, "Azure configuration missing")
+	assert.EqualError(t, err, "Azure configuration missing: AZURE_CLIENT_ID,AZURE_CLIENT_SECRET,AZURE_SUBSCRIPTION_ID,AZURE_TENANT_ID,AZURE_RESOURCE_GROUP")
 	restoreAzureEnv()
 }
 

providers/dns/cloudflare/cloudflare.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"net/http"
 	"os"
+	"strings"
 	"time"
 
 	"github.com/xenolf/lego/acme"
@@ -37,7 +38,14 @@ func NewDNSProvider() (*DNSProvider, error) {
 // DNSProvider instance configured for cloudflare.
 func NewDNSProviderCredentials(email, key string) (*DNSProvider, error) {
 	if email == "" || key == "" {
-		return nil, fmt.Errorf("CloudFlare credentials missing")
+		missingEnvVars := []string{}
+		if email == "" {
+			missingEnvVars = append(missingEnvVars, "CLOUDFLARE_EMAIL")
+		}
+		if key == "" {
+			missingEnvVars = append(missingEnvVars, "CLOUDFLARE_API_KEY")
+		}
+		return nil, fmt.Errorf("CloudFlare credentials missing: %s", strings.Join(missingEnvVars, ","))
 	}
 
 	return &DNSProvider{

providers/dns/cloudflare/cloudflare_test.go

@@ -49,10 +49,17 @@ func TestNewDNSProviderMissingCredErr(t *testing.T) {
 	os.Setenv("CLOUDFLARE_EMAIL", "")
 	os.Setenv("CLOUDFLARE_API_KEY", "")
 	_, err := NewDNSProvider()
-	assert.EqualError(t, err, "CloudFlare credentials missing")
+  assert.EqualError(t, err, "CloudFlare credentials missing: CLOUDFLARE_EMAIL,CLOUDFLARE_API_KEY")
 	restoreCloudFlareEnv()
 }
 
+func TestNewDNSProviderMissingCredErrSingle(t *testing.T){
+  os.Setenv("CLOUDFLARE_EMAIL", "awesome@possum.com")
+  _, err:= NewDNSProvider()
+  assert.EqualError(t, err, "CloudFlare credentials missing: CLOUDFLARE_API_KEY")
+  restoreCloudFlareEnv()
+}
+
 func TestCloudFlarePresent(t *testing.T) {
 	if !cflareLiveTest {
 		t.Skip("skipping live test")