Adding new resource to manage group LDAP links

gitlab/provider.go

@@ -84,6 +84,7 @@ func Provider() terraform.ResourceProvider {
 			"gitlab_service_jira":               resourceGitlabServiceJira(),
 			"gitlab_project_share_group":        resourceGitlabProjectShareGroup(),
 			"gitlab_group_cluster":              resourceGitlabGroupCluster(),
+			"gitlab_group_ldap_link":            resourceGitlabGroupLdapLink(),
 		},
 
 		ConfigureFunc: providerConfigure,

gitlab/resource_gitlab_group_ldap_link.go

@@ -0,0 +1,156 @@
+package gitlab
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
+	gitlab "github.com/xanzy/go-gitlab"
+)
+
+func resourceGitlabGroupLdapLink() *schema.Resource {
+	acceptedAccessLevels := make([]string, 0, len(accessLevelID))
+	for k := range accessLevelID {
+		acceptedAccessLevels = append(acceptedAccessLevels, k)
+	}
+	return &schema.Resource{
+		Create: resourceGitlabGroupLdapLinkCreate,
+		Read:   resourceGitlabGroupLdapLinkRead,
+		Delete: resourceGitlabGroupLdapLinkDelete,
+
+		Schema: map[string]*schema.Schema{
+			"group_id": {
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+			"cn": {
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+			// Using the friendlier "access_level" here instead of the GitLab API "group_access".
+			"access_level": {
+				Type:         schema.TypeString,
+				ValidateFunc: validateValueFunc(acceptedAccessLevels),
+				Required:     true,
+				ForceNew:     true,
+			},
+			// Changing GitLab API parameter "provider" to "ldap_provider" to avoid clashing with the Terraform "provider" key word
+			"ldap_provider": {
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+			"force": {
+				Type:     schema.TypeBool,
+				Optional: true,
+				Default:  false,
+				ForceNew: true,
+			},
+		},
+	}
+}
+
+func resourceGitlabGroupLdapLinkCreate(d *schema.ResourceData, meta interface{}) error {
+	client := meta.(*gitlab.Client)
+
+	groupId := d.Get("group_id").(string)
+	cn := d.Get("cn").(string)
+	group_access := int(accessLevelNameToValue[d.Get("access_level").(string)])
+	ldap_provider := d.Get("ldap_provider").(string)
+	force := d.Get("force").(bool)
+
+	options := &gitlab.AddGroupLDAPLinkOptions{
+		CN:          &cn,
+		GroupAccess: &group_access,
+		Provider:    &ldap_provider,
+	}
+
+	if force {
+		resourceGitlabGroupLdapLinkDelete(d, meta)
+	}
+
+	log.Printf("[DEBUG] Create GitLab group LdapLink %s", d.Id())
+	LdapLink, _, err := client.Groups.AddGroupLDAPLink(groupId, options)
+	if err != nil {
+		return err
+	}
+
+	d.SetId(buildTwoPartID(&LdapLink.Provider, &LdapLink.CN))
+
+	return resourceGitlabGroupLdapLinkRead(d, meta)
+}
+
+func resourceGitlabGroupLdapLinkRead(d *schema.ResourceData, meta interface{}) error {
+	client := meta.(*gitlab.Client)
+	groupId := d.Get("group_id").(string)
+
+	// Try to fetch all group links from GitLab
+	log.Printf("[DEBUG] Read GitLab group LdapLinks %s", groupId)
+	ldapLinks, _, err := client.Groups.ListGroupLDAPLinks(groupId, nil)
+	if err != nil {
+		// The read/GET API wasn't implemented in GitLab until version 12.8 (March 2020, well after the add and delete APIs).
+		// If we 404, assume GitLab is at an older version and take things on faith.
+		switch err.(type) {
+		case *gitlab.ErrorResponse:
+			if err.(*gitlab.ErrorResponse).Response.StatusCode == 404 {
+				log.Printf("[WARNING] This GitLab instance doesn't have the GET API for group_ldap_sync.  Please upgrade to 12.8 or later for best results.")
+			} else {
+				return err
+			}
+		default:
+			return err
+		}
+	}
+
+	// If we got here and don't have links, assume GitLab is below version 12.8 and skip the check
+	if ldapLinks != nil {
+		// Check if the LDAP link exists in the returned list of links
+		found := false
+		for _, ldapLink := range ldapLinks {
+			if buildTwoPartID(&ldapLink.Provider, &ldapLink.CN) == d.Id() {
+				d.Set("group_id", groupId)
+				d.Set("cn", ldapLink.CN)
+				d.Set("group_access", ldapLink.GroupAccess)
+				d.Set("ldap_provider", ldapLink.Provider)
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			d.SetId("")
+			return errors.New(fmt.Sprintf("LdapLink %s does not exist.", d.Id()))
+		}
+	}
+
+	return nil
+}
+
+func resourceGitlabGroupLdapLinkDelete(d *schema.ResourceData, meta interface{}) error {
+	client := meta.(*gitlab.Client)
+	groupId := d.Get("group_id").(string)
+	cn := d.Get("cn").(string)
+	ldap_provider := d.Get("ldap_provider").(string)
+
+	log.Printf("[DEBUG] Delete GitLab group LdapLink %s", d.Id())
+	_, err := client.Groups.DeleteGroupLDAPLinkForProvider(groupId, ldap_provider, cn)
+	if err != nil {
+		switch err.(type) {
+		case *gitlab.ErrorResponse:
+			// Ignore LDAP links that don't exist
+			if strings.Contains(string(err.(*gitlab.ErrorResponse).Message), "Linked LDAP group not found") {
+				log.Printf("[WARNING] %s", err)
+			} else {
+				return err
+			}
+		default:
+			return err
+		}
+	}
+
+	return nil
+}