feat(vpcgw): read gateway network's private IPs

Co-authored-by: Yacine FODIL <[email protected]>

Author: Mia-Cross

docs/resources/vpc_gateway_network.md

@@ -113,6 +113,9 @@ In addition to all arguments above, the following attributes are exported:
 - `created_at` - The date and time of the creation of the GatewayNetwork.
 - `updated_at` - The date and time of the last update of the GatewayNetwork.
 - `status` - The status of the Public Gateway's connection to the Private Network.
+- `private_ip` - The list of private IPv4 addresses associated with the resource.
+    - `id` - The ID of the IPv4 address resource.
+    - `address` - The private IPv4 address.
 
 ## Import
 

internal/services/ipam/helpers.go

@@ -1,6 +1,8 @@
 package ipam
 
 import (
+	"context"
+	"fmt"
 	"net"
 	"time"
 
@@ -65,3 +67,58 @@ func diffSuppressFuncStandaloneIPandCIDR(_, oldValue, newValue string, _ *schema
 
 	return false
 }
+
+type GetResourcePrivateIPsOptions struct {
+	ResourceType     *ipam.ResourceType
+	ResourceID       *string
+	ResourceName     *string
+	PrivateNetworkID *string
+}
+
+// GetResourcePrivateIPs fetches the private IP addresses of a resource in a private network.
+func GetResourcePrivateIPs(ctx context.Context, m interface{}, region scw.Region, opts *GetResourcePrivateIPsOptions) ([]map[string]interface{}, error) {
+	ipamAPI := ipam.NewAPI(meta.ExtractScwClient(m))
+
+	req := &ipam.ListIPsRequest{
+		Region: region,
+	}
+
+	if opts != nil {
+		if opts.PrivateNetworkID != nil {
+			req.PrivateNetworkID = opts.PrivateNetworkID
+		}
+		if opts.ResourceID != nil {
+			req.ResourceID = opts.ResourceID
+		}
+		if opts.ResourceName != nil {
+			req.ResourceName = opts.ResourceName
+		}
+		if opts.ResourceType != nil {
+			req.ResourceType = *opts.ResourceType
+		}
+	}
+
+	resp, err := ipamAPI.ListIPs(req, scw.WithContext(ctx))
+	if err != nil {
+		return nil, fmt.Errorf("error fetching IPs from IPAM: %w", err)
+	}
+
+	if len(resp.IPs) == 0 {
+		return nil, nil
+	}
+
+	ipList := make([]map[string]interface{}, 0, len(resp.IPs))
+	for _, ip := range resp.IPs {
+		ipNet := ip.Address
+		if ipNet.IP == nil {
+			continue
+		}
+		ipMap := map[string]interface{}{
+			"id":      regional.NewIDString(region, ip.ID),
+			"address": ipNet.IP.String(),
+		}
+		ipList = append(ipList, ipMap)
+	}
+
+	return ipList, nil
+}