chore(docs): add possible values for security group rule protocol (#857)

relates to #816

docs/resources/security_group_rule.md

@@ -74,5 +74,5 @@ Required:
 
 Optional:
 
-- `name` (String) The protocol name which the rule should match. Either `name` or `number` must be provided.
+- `name` (String) The protocol name which the rule should match. Either `name` or `number` must be provided. Possible values are: `ah`, `dccp`, `egp`, `esp`, `gre`, `icmp`, `igmp`, `ipip`, `ipv6-encap`, `ipv6-frag`, `ipv6-icmp`, `ipv6-nonxt`, `ipv6-opts`, `ipv6-route`, `ospf`, `pgm`, `rsvp`, `sctp`, `tcp`, `udp`, `udplite`, `vrrp`.
 - `number` (Number) The protocol number which the rule should match. Either `name` or `number` must be provided.

stackit/internal/services/iaas/securitygrouprule/resource.go

@@ -34,10 +34,14 @@ import (
 
 // Ensure the implementation satisfies the expected interfaces.
 var (
-	_             resource.Resource                = &securityGroupRuleResource{}
-	_             resource.ResourceWithConfigure   = &securityGroupRuleResource{}
-	_             resource.ResourceWithImportState = &securityGroupRuleResource{}
-	icmpProtocols                                  = []string{"icmp", "ipv6-icmp"}
+	_                       resource.Resource                = &securityGroupRuleResource{}
+	_                       resource.ResourceWithConfigure   = &securityGroupRuleResource{}
+	_                       resource.ResourceWithImportState = &securityGroupRuleResource{}
+	icmpProtocols                                            = []string{"icmp", "ipv6-icmp"}
+	protocolsPossibleValues                                  = []string{
+		"ah", "dccp", "egp", "esp", "gre", "icmp", "igmp", "ipip", "ipv6-encap", "ipv6-frag", "ipv6-icmp",
+		"ipv6-nonxt", "ipv6-opts", "ipv6-route", "ospf", "pgm", "rsvp", "sctp", "tcp", "udp", "udplite", "vrrp",
+	}
 )
 
 type Model struct {
@@ -329,7 +333,7 @@ func (r *securityGroupRuleResource) Schema(_ context.Context, _ resource.SchemaR
 				},
 				Attributes: map[string]schema.Attribute{
 					"name": schema.StringAttribute{
-						Description: "The protocol name which the rule should match. Either `name` or `number` must be provided.",
+						Description: fmt.Sprintf("The protocol name which the rule should match. Either `name` or `number` must be provided. %s", utils.FormatPossibleValues(protocolsPossibleValues)),
 						Optional:    true,
 						Computed:    true,
 						Validators: []validator.String{

stackit/internal/utils/utils.go

@@ -144,3 +144,12 @@ func LogError(ctx context.Context, inputDiags *diag.Diagnostics, err error, summ
 	}
 	core.LogAndAddError(ctx, inputDiags, summary, description)
 }
+
+// FormatPossibleValues formats a slice into a comma-separated-list for usage in the provider docs
+func FormatPossibleValues(values []string) string {
+	var formattedValues []string
+	for _, value := range values {
+		formattedValues = append(formattedValues, fmt.Sprintf("`%v`", value))
+	}
+	return fmt.Sprintf("Possible values are: %s.", strings.Join(formattedValues, ", "))
+}

stackit/internal/utils/utils_test.go

@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
@@ -268,3 +269,38 @@ func TestIsLegacyProjectRole(t *testing.T) {
 		})
 	}
 }
+
+func TestFormatPossibleValues(t *testing.T) {
+	gotPrefix := "Possible values are:"
+
+	type args struct {
+		values []string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "single string value",
+			args: args{
+				values: []string{"foo"},
+			},
+			want: fmt.Sprintf("%s `foo`.", gotPrefix),
+		},
+		{
+			name: "multiple string value",
+			args: args{
+				values: []string{"foo", "bar", "trololol"},
+			},
+			want: fmt.Sprintf("%s `foo`, `bar`, `trololol`.", gotPrefix),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := FormatPossibleValues(tt.args.values); got != tt.want {
+				t.Errorf("FormatPossibleValues() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}