providers/aws: fix assertion of non-required cidr blocks in sec groups

fixes #65, #86

builtin/providers/aws/structure.go

@@ -47,34 +47,52 @@ func expandIPPerms(configured []interface{}) ([]ec2.IPPerm, error) {
 	// Loop over our configured permissions and create
 	// an array of goamz/ec2 compatabile objects
 	for _, perm := range configured {
+		// Our permission object
 		newP := perm.(map[string]interface{})
+
+		// Our new returned goamz compatible permission
+		p := ec2.IPPerm{}
+
+		// Ports
+		if attr, ok := newP["from_port"].(string); ok {
+			fromPort, err := strconv.Atoi(attr)
+			if err != nil {
+				return nil, err
+			}
+			p.FromPort = fromPort
+		}
+
+		if attr, ok := newP["to_port"].(string); ok {
+			toPort, err := strconv.Atoi(attr)
+			if err != nil {
+				return nil, err
+			}
+			p.ToPort = toPort
+		}
+
+		if attr, ok := newP["protocol"].(string); ok {
+			p.Protocol = attr
+		}
+
 		// Loop over the array of sg ids and built
 		// compatibile goamz objects
-		expandedGroups := []ec2.UserSecurityGroup{}
-		configGroups, ok := newP["security_groups"].([]interface{})
-		if ok {
-			gs := expandStringList(configGroups)
+		if secGroups, ok := newP["security_groups"].([]interface{}); ok {
+			expandedGroups := []ec2.UserSecurityGroup{}
+			gs := expandStringList(secGroups)
+
 			for _, g := range gs {
 				newG := ec2.UserSecurityGroup{
 					Id: g,
 				}
 				expandedGroups = append(expandedGroups, newG)
 			}
-		}
 
-		fromPort, err := strconv.Atoi(newP["from_port"].(string))
-		toPort, err := strconv.Atoi(newP["to_port"].(string))
-		if err != nil {
-			return nil, err
+			p.SourceGroups = expandedGroups
 		}
 
-		// Create the permission objet
-		p := ec2.IPPerm{
-			Protocol:     newP["protocol"].(string),
-			FromPort:     fromPort,
-			ToPort:       toPort,
-			SourceIPs:    expandStringList(newP["cidr_blocks"].([]interface{})),
-			SourceGroups: expandedGroups,
+		// Expand CIDR blocks
+		if cidrBlocks, ok := newP["cidr_blocks"].([]interface{}); ok {
+			p.SourceIPs = expandStringList(cidrBlocks)
 		}
 
 		perms = append(perms, p)

builtin/providers/aws/structure_test.go

@@ -59,6 +59,51 @@ func Test_expandIPPerms(t *testing.T) {
 
 }
 
+func Test_expandIPPerms_bad(t *testing.T) {
+	badConf := map[string]string{
+		"ingress.#":           "1",
+		"ingress.0.from_port": "not number",
+	}
+
+	expanded := flatmap.Expand(badConf, "ingress").([]interface{})
+	perms, err := expandIPPerms(expanded)
+
+	if err == nil {
+		t.Fatalf("should have err: %#v", perms)
+	}
+}
+
+func Test_expandIPPerms_NoCidr(t *testing.T) {
+	conf := testConf()
+	delete(conf, "ingress.0.cidr_blocks.#")
+	delete(conf, "ingress.0.cidr_blocks.0")
+
+	expanded := flatmap.Expand(conf, "ingress").([]interface{})
+	perms, err := expandIPPerms(expanded)
+
+	if err != nil {
+		t.Fatalf("bad: %#v", err)
+	}
+	expected := ec2.IPPerm{
+		Protocol: "icmp",
+		FromPort: 1,
+		ToPort:   -1,
+		SourceGroups: []ec2.UserSecurityGroup{
+			ec2.UserSecurityGroup{
+				Id: "sg-11111",
+			},
+		},
+	}
+
+	if !reflect.DeepEqual(perms[0], expected) {
+		t.Fatalf(
+			"Got:\n\n%#v\n\nExpected:\n\n%#v\n",
+			perms[0],
+			expected)
+	}
+
+}
+
 func Test_flattenIPPerms(t *testing.T) {
 	cases := []struct {
 		Input  []ec2.IPPerm