feat: add function to get firebase users

firebase/auth/auth.go

@@ -84,8 +84,3 @@ func DeleteFirebaseUser(ctx context.Context, uid string) error {
 	}
 	return nil
 }
-
-// ListAllFirebaseUsers get all users in firebase auth
-func ListAllFirebaseUsers(ctx context.Context, maxResults uint32, nextPageToken string) error {
-	panic("not implemented")
-}

firebase/auth/listUsers.go

@@ -0,0 +1,40 @@
+package auth
+
+import (
+	"context"
+	"fmt"
+
+	"firebase.google.com/go/auth"
+	"github.com/mainawycliffe/kamanda/firebase"
+	"google.golang.org/api/iterator"
+)
+
+type ListUsersResponse struct {
+	Users         []*auth.ExportedUserRecord
+	nextPageToken string
+}
+
+// ListUsers get all users in firebase auth
+func ListUsers(ctx context.Context, maxSize int, nextPageToken string) (ListUsersResponse, error) {
+	client, err := firebase.Auth(ctx, "")
+	if err != nil {
+		return ListUsersResponse{}, fmt.Errorf("Error authenticating firebase account: %w", err)
+	}
+	usersIterator := client.Users(ctx, nextPageToken)
+	users := make([]*auth.ExportedUserRecord, 0)
+	for {
+		user, err := usersIterator.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			return ListUsersResponse{}, err
+		}
+		users = append(users, user)
+	}
+	response := ListUsersResponse{
+		Users:         users,
+		nextPageToken: usersIterator.PageInfo().Token,
+	}
+	return response, nil
+}