Implement CreateUser support for the Graph LDAP backend

This adds basic support for creating users via the GraphAPI
LDAP backend. This currently just maintains the bare minimum
Attributes for the inetOrgPerson objectclass.

Co-authored-by: Ralf Haferkamp <rhaferkamp@owncloud.com>

graph/pkg/service/v0/service.go

@@ -67,6 +67,7 @@ func NewService(opts ...Option) Service {
 			})
 			r.Route("/users", func(r chi.Router) {
 				r.Get("/", svc.GetUsers)
+				r.Post("/", svc.PostUser)
 				r.Route("/{userID}", func(r chi.Router) {
 					r.Get("/", svc.GetUser)
 				})

graph/pkg/service/v0/users.go

@@ -1,6 +1,7 @@
 package svc
 
 import (
+	"encoding/json"
 	"errors"
 	"net/http"
 	"net/url"
@@ -8,9 +9,9 @@ import (
 	revactx "github.com/cs3org/reva/pkg/ctx"
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/render"
+	libregraph "github.com/owncloud/libre-graph-api-go"
 	"github.com/owncloud/ocis/graph/pkg/identity"
 	"github.com/owncloud/ocis/graph/pkg/service/v0/errorcode"
-	//msgraph "github.com/owncloud/open-graph-api-go" // FIXME needs OnPremisesSamAccountName, OnPremisesDomainName and AdditionalData
 )
 
 // GetMe implements the Service interface.
@@ -32,7 +33,6 @@ func (g Graph) GetMe(w http.ResponseWriter, r *http.Request) {
 }
 
 // GetUsers implements the Service interface.
-// TODO use cs3 api to look up user
 func (g Graph) GetUsers(w http.ResponseWriter, r *http.Request) {
 	users, err := g.identityBackend.GetUsers(r.Context(), r.URL.Query())
 	if err != nil {
@@ -47,6 +47,28 @@ func (g Graph) GetUsers(w http.ResponseWriter, r *http.Request) {
 	render.JSON(w, r, &listResponse{Value: users})
 }
 
+func (g Graph) PostUser(w http.ResponseWriter, r *http.Request) {
+	u := libregraph.NewUser()
+	err := json.NewDecoder(r.Body).Decode(u)
+	if err != nil {
+		errorcode.InvalidRequest.Render(w, r, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	if isNilOrEmpty(u.DisplayName) || isNilOrEmpty(u.OnPremisesSamAccountName) || isNilOrEmpty(u.Mail) {
+		errorcode.InvalidRequest.Render(w, r, http.StatusBadRequest, "Missing Required Attribute")
+		return
+	}
+
+	if u, err = g.identityBackend.CreateUser(r.Context(), *u); err != nil {
+		errorcode.GeneralException.Render(w, r, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	render.Status(r, http.StatusOK)
+	render.JSON(w, r, u)
+}
+
 // GetUser implements the Service interface.
 func (g Graph) GetUser(w http.ResponseWriter, r *http.Request) {
 	userID := chi.URLParam(r, "userID")
@@ -74,3 +96,7 @@ func (g Graph) GetUser(w http.ResponseWriter, r *http.Request) {
 	render.Status(r, http.StatusOK)
 	render.JSON(w, r, user)
 }
+
+func isNilOrEmpty(s *string) bool {
+	return s == nil || *s == ""
+}