fix: creating firewall with rules not working correctly (#412)

Because the Firewall API expects a different JSON formatting than it
responds with (some fields must be omitted even though they are included
in the response) we have to create another struct to marshal rules
properly.

This should be reverted once the Firewall API has consistent response
and request schemas.

See hetznercloud/cli#725

Author: phm07

hcloud/firewall.go

@@ -298,34 +298,7 @@ type FirewallSetRulesOpts struct {
 
 // SetRules sets the rules of a Firewall.
 func (c *FirewallClient) SetRules(ctx context.Context, firewall *Firewall, opts FirewallSetRulesOpts) ([]*Action, *Response, error) {
-	s := firewallSetRulesOptsToSchema(opts)
-
-	// We can't use the FirewallRule struct here, because unlike in the response some fields must be omitted when empty.
-	type firewallRule struct {
-		Direction      string   `json:"direction"`
-		SourceIPs      []string `json:"source_ips,omitempty"`
-		DestinationIPs []string `json:"destination_ips,omitempty"`
-		Protocol       string   `json:"protocol"`
-		Port           *string  `json:"port,omitempty"`
-		Description    *string  `json:"description,omitempty"`
-	}
-
-	rules := make([]firewallRule, 0, len(s.Rules))
-	for _, r := range s.Rules {
-		rules = append(rules, firewallRule{
-			Direction:      r.Direction,
-			SourceIPs:      r.SourceIPs,
-			DestinationIPs: r.DestinationIPs,
-			Protocol:       r.Protocol,
-			Port:           r.Port,
-			Description:    r.Description,
-		})
-	}
-	reqBody := struct {
-		Rules []firewallRule `json:"rules"`
-	}{
-		Rules: rules,
-	}
+	reqBody := firewallSetRulesOptsToSchema(opts)
 
 	reqBodyData, err := json.Marshal(reqBody)
 	if err != nil {

hcloud/firewall_test.go

@@ -328,7 +328,7 @@ func TestFirewallSetRules(t *testing.T) {
 		{
 			name: "direction in",
 			expectedReqBody: schema.FirewallActionSetRulesRequest{
-				Rules: []schema.FirewallRule{
+				Rules: []schema.FirewallRuleRequest{
 					{
 						Direction: "in",
 						SourceIPs: []string{"10.0.0.5/32", "10.0.0.6/32"},
@@ -358,7 +358,7 @@ func TestFirewallSetRules(t *testing.T) {
 		{
 			name: "direction out",
 			expectedReqBody: schema.FirewallActionSetRulesRequest{
-				Rules: []schema.FirewallRule{
+				Rules: []schema.FirewallRuleRequest{
 					{
 						Direction:      "out",
 						DestinationIPs: []string{"10.0.0.5/32", "10.0.0.6/32"},
@@ -388,7 +388,7 @@ func TestFirewallSetRules(t *testing.T) {
 		{
 			name: "empty",
 			expectedReqBody: schema.FirewallActionSetRulesRequest{
-				Rules: []schema.FirewallRule{},
+				Rules: []schema.FirewallRuleRequest{},
 			},
 			opts: FirewallSetRulesOpts{
 				Rules: []FirewallRule{},
@@ -397,7 +397,7 @@ func TestFirewallSetRules(t *testing.T) {
 		{
 			name: "description",
 			expectedReqBody: schema.FirewallActionSetRulesRequest{
-				Rules: []schema.FirewallRule{
+				Rules: []schema.FirewallRuleRequest{
 					{
 						Direction:      "out",
 						DestinationIPs: []string{"10.0.0.5/32", "10.0.0.6/32"},

hcloud/schema/firewall.go

@@ -12,7 +12,7 @@ type Firewall struct {
 	AppliedTo []FirewallResource `json:"applied_to"`
 }
 
-// FirewallRule defines the schema of a Firewall rule.
+// FirewallRule defines the schema of a Firewall rule in responses.
 type FirewallRule struct {
 	Direction      string   `json:"direction"`
 	SourceIPs      []string `json:"source_ips"`
@@ -22,6 +22,16 @@ type FirewallRule struct {
 	Description    *string  `json:"description"`
 }
 
+// FirewallRuleRequest defines the schema of a Firewall rule in requests.
+type FirewallRuleRequest struct {
+	Direction      string   `json:"direction"`
+	SourceIPs      []string `json:"source_ips,omitempty"`
+	DestinationIPs []string `json:"destination_ips,omitempty"`
+	Protocol       string   `json:"protocol"`
+	Port           *string  `json:"port,omitempty"`
+	Description    *string  `json:"description,omitempty"`
+}
+
 // FirewallListResponse defines the schema of the response when listing Firewalls.
 type FirewallListResponse struct {
 	Firewalls []Firewall `json:"firewalls"`
@@ -34,10 +44,10 @@ type FirewallGetResponse struct {
 
 // FirewallCreateRequest defines the schema of the request to create a Firewall.
 type FirewallCreateRequest struct {
-	Name    string             `json:"name"`
-	Labels  *map[string]string `json:"labels,omitempty"`
-	Rules   []FirewallRule     `json:"rules,omitempty"`
-	ApplyTo []FirewallResource `json:"apply_to,omitempty"`
+	Name    string                `json:"name"`
+	Labels  *map[string]string    `json:"labels,omitempty"`
+	Rules   []FirewallRuleRequest `json:"rules,omitempty"`
+	ApplyTo []FirewallResource    `json:"apply_to,omitempty"`
 }
 
 // FirewallResource defines the schema of a resource to apply the new Firewall on.
@@ -76,7 +86,7 @@ type FirewallUpdateResponse struct {
 
 // FirewallActionSetRulesRequest defines the schema of the request when setting Firewall rules.
 type FirewallActionSetRulesRequest struct {
-	Rules []FirewallRule `json:"rules"`
+	Rules []FirewallRuleRequest `json:"rules"`
 }
 
 // FirewallActionSetRulesResponse defines the schema of the response when setting Firewall rules.