resource pullzone_hostname: handle internal hostnames transparently

internal hostnames (`*.b-cdn.net`) are automatically created when a pullzone is created and cannot be deleted

CHANGELOG.md

@@ -7,6 +7,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 > [!NOTE]
 > While we strive to maintain backwards compatibility as much as possible, we can't guarantee semantic versioning will be strictly followed, as this provider depends on the underlying [bunny.net API](https://docs.bunny.net/reference/bunnynet-api-overview).
 
+## [0.3.14] - 2024-09-10
+## Changed
+- resource pullzone_hostname: deleting an internal hostname (`*.b-cdn.net`) will remove the resource from state without deleting it, as internal hostnames cannot be deleted;
+- resource pullzone_hostname: creating an internal hostname (`*.b-cdn.net`) will adopt the pre-existing default hostname instead of creating a new one, as the default hostname is automatically created with the `pullzone` resource;
+
 ## [0.3.13] - 2024-09-09
 ### Fixed
 - resource pullzone_optimizer_class: some fields were wrongly escaped ([#11](https://github.com/BunnyWay/terraform-provider-bunnynet/issues/11))

internal/api/pullzone_hostname.go

@@ -10,7 +10,9 @@ import (
 	"errors"
 	"fmt"
 	"github.com/bunnyway/terraform-provider-bunnynet/internal/utils"
+	"golang.org/x/exp/slices"
 	"net/http"
+	"strings"
 )
 
 type PullzoneHostname struct {
@@ -30,6 +32,26 @@ func (c *Client) CreatePullzoneHostname(data PullzoneHostname) (PullzoneHostname
 		return PullzoneHostname{}, errors.New("pullzone is required")
 	}
 
+	pullzone, err := c.GetPullzone(data.PullzoneId)
+	if err != nil {
+		return PullzoneHostname{}, err
+	}
+
+	// if creating the default hostname, return existing
+	if strings.HasSuffix(data.Name, "."+pullzone.CnameDomain) {
+		hostnameIdx := slices.IndexFunc(pullzone.Hostnames, func(hostname PullzoneHostname) bool {
+			return hostname.IsSystemHostname && hostname.Name == data.Name
+		})
+
+		if hostnameIdx > -1 {
+			data.Id = pullzone.Hostnames[hostnameIdx].Id
+			data.PullzoneId = pullzone.Id
+			return c.UpdatePullzoneHostname(data, pullzone.Hostnames[hostnameIdx])
+		}
+
+		// if system hostname not found, try to create it, the API should return an error
+	}
+
 	body, err := json.Marshal(map[string]string{
 		"Hostname": data.Name,
 	})
@@ -52,7 +74,7 @@ func (c *Client) CreatePullzoneHostname(data PullzoneHostname) (PullzoneHostname
 		}
 	}
 
-	pullzone, err := c.GetPullzone(pullzoneId)
+	pullzone, err = c.GetPullzone(pullzoneId)
 	if err != nil {
 		return PullzoneHostname{}, err
 	}

internal/provider/resource_pullzone_hostname.go

@@ -265,6 +265,11 @@ func (r *PullzoneHostnameResource) Delete(ctx context.Context, req resource.Dele
 		return
 	}
 
+	// b-cdn.net hostnames cannot be deleted
+	if data.IsInternal.ValueBool() {
+		return
+	}
+
 	err := r.client.DeletePullzoneHostname(data.PullzoneId.ValueInt64(), data.Name.ValueString())
 	if err != nil {
 		resp.Diagnostics.Append(diag.NewErrorDiagnostic("Error deleting hostname", err.Error()))