backend/azure: Add tests for both token types

Add two new test cases, TestBackendAzureAccountToken and
TestBackendAzureContainerToken, that ensure that the authorization using
both types of token works.

This introduces two new environment variables,
RESTIC_TEST_AZURE_ACCOUNT_SAS and RESTIC_TEST_AZURE_CONTAINER_SAS, that
contain the tokens to use when testing restic. If an environment
variable is missing, the related test is skipped.

internal/backend/azure/azure_test.go

@@ -80,6 +80,91 @@ func BenchmarkBackendAzure(t *testing.B) {
 	newAzureTestSuite().RunBenchmarks(t)
 }
 
+// TestBackendAzureAccountToken tests that a Storage Account SAS/SAT token can authorize.
+// This test ensures that restic can use a token that was generated using the storage
+// account keys can be used to authorize the azure connection.
+// Requires the RESTIC_TEST_AZURE_ACCOUNT_NAME, RESTIC_TEST_AZURE_REPOSITORY, and the
+// RESTIC_TEST_AZURE_ACCOUNT_SAS environment variables to be set, otherwise this test
+// will be skipped.
+func TestBackendAzureAccountToken(t *testing.T) {
+	vars := []string{
+		"RESTIC_TEST_AZURE_ACCOUNT_NAME",
+		"RESTIC_TEST_AZURE_REPOSITORY",
+		"RESTIC_TEST_AZURE_ACCOUNT_SAS",
+	}
+
+	for _, v := range vars {
+		if os.Getenv(v) == "" {
+			t.Skipf("set %v to test SAS/SAT Token Authentication", v)
+			return
+		}
+	}
+
+	ctx, cancel := context.WithCancel(context.TODO())
+	defer cancel()
+
+	cfg, err := azure.ParseConfig(os.Getenv("RESTIC_TEST_AZURE_REPOSITORY"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	cfg.AccountName = os.Getenv("RESTIC_TEST_AZURE_ACCOUNT_NAME")
+	cfg.AccountSAS = options.NewSecretString(os.Getenv("RESTIC_TEST_AZURE_ACCOUNT_SAS"))
+
+	tr, err := backend.Transport(backend.TransportOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = azure.Create(ctx, *cfg, tr)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// TestBackendAzureContainerToken tests that a container SAS/SAT token can authorize.
+// This test ensures that restic can use a token that was generated using a user
+// delegation key against the container we are storing data in can be used to
+// authorize the azure connection.
+// Requires the RESTIC_TEST_AZURE_ACCOUNT_NAME, RESTIC_TEST_AZURE_REPOSITORY, and the
+// RESTIC_TEST_AZURE_CONTAINER_SAS environment variables to be set, otherwise this test
+// will be skipped.
+func TestBackendAzureContainerToken(t *testing.T) {
+	vars := []string{
+		"RESTIC_TEST_AZURE_ACCOUNT_NAME",
+		"RESTIC_TEST_AZURE_REPOSITORY",
+		"RESTIC_TEST_AZURE_CONTAINER_SAS",
+	}
+
+	for _, v := range vars {
+		if os.Getenv(v) == "" {
+			t.Skipf("set %v to test SAS/SAT Token Authentication", v)
+			return
+		}
+	}
+
+	ctx, cancel := context.WithCancel(context.TODO())
+	defer cancel()
+
+	cfg, err := azure.ParseConfig(os.Getenv("RESTIC_TEST_AZURE_REPOSITORY"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	cfg.AccountName = os.Getenv("RESTIC_TEST_AZURE_ACCOUNT_NAME")
+	cfg.AccountSAS = options.NewSecretString(os.Getenv("RESTIC_TEST_AZURE_CONTAINER_SAS"))
+
+	tr, err := backend.Transport(backend.TransportOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = azure.Create(ctx, *cfg, tr)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
 func TestUploadLargeFile(t *testing.T) {
 	if os.Getenv("RESTIC_AZURE_TEST_LARGE_UPLOAD") == "" {
 		t.Skip("set RESTIC_AZURE_TEST_LARGE_UPLOAD=1 to test large uploads")