From f8fd49a9a945d85e8c5cc063261f2b3c4343a68e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rn=20Friedrich=20Dreyer?= <jfd@butonic.de>
Date: Wed, 1 Mar 2023 16:54:32 +0100
Subject: [PATCH] invitation implementation outline
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Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>
---
 services/invitations/pkg/service/v0/errors.go |  6 +-
 .../invitations/pkg/service/v0/service.go     | 69 ++++++++++++++++++-
 2 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/services/invitations/pkg/service/v0/errors.go b/services/invitations/pkg/service/v0/errors.go
index b71ec4ca7..7f34c4edb 100644
--- a/services/invitations/pkg/service/v0/errors.go
+++ b/services/invitations/pkg/service/v0/errors.go
@@ -2,4 +2,8 @@ package service
 
 import "errors"
 
-var ErrNotFound = errors.New("query target not found")
+var (
+	ErrNotFound     = errors.New("query target not found")
+	ErrBadRequest   = errors.New("bad request")
+	ErrMissingEmail = errors.New("missing email address")
+)
diff --git a/services/invitations/pkg/service/v0/service.go b/services/invitations/pkg/service/v0/service.go
index aa5fd0785..b72194c88 100644
--- a/services/invitations/pkg/service/v0/service.go
+++ b/services/invitations/pkg/service/v0/service.go
@@ -1,8 +1,13 @@
 package service
 
 import (
+	"bytes"
 	"context"
+	"crypto/tls"
+	"encoding/json"
+	"net/http"
 
+	libregraph "github.com/owncloud/libre-graph-api-go"
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/owncloud/ocis/v2/services/invitations/pkg/config"
 	"github.com/owncloud/ocis/v2/services/invitations/pkg/invitations"
@@ -49,7 +54,65 @@ type svc struct {
 
 // Invite implements the service interface
 func (s svc) Invite(ctx context.Context, invitation *invitations.Invitation) (*invitations.Invitation, error) {
-	return &invitations.Invitation{
-		InvitedUserDisplayName: "Yay",
-	}, nil
+
+	if invitation == nil {
+		return nil, ErrBadRequest
+	}
+
+	if invitation.InvitedUserEmailAddress == "" {
+		return nil, ErrMissingEmail
+	}
+
+	user := &libregraph.User{
+		Mail: &invitation.InvitedUserEmailAddress,
+		// TODO we cannot set the user type here
+	}
+
+	if invitation.InvitedUserDisplayName != "" {
+		user.DisplayName = &invitation.InvitedUserDisplayName
+	}
+	// we don't really need a username as guests have to log in with their email address anyway
+	// what if later a user is provisioned with a guest accounts email address?
+
+	data, err := json.Marshal(user)
+	if err != nil {
+		return nil, err
+	}
+
+	// send a request to the provisioning endpoint
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: true /*TODO make configurable*/},
+	}
+	client := &http.Client{Transport: tr}
+
+	req, err := http.NewRequest("POST", "/graph/v1.0/users", bytes.NewReader(data))
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO either forward current user token or use bearer token?
+	req.Header.Set("Authorization", "Bearer some-token")
+
+	res, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	invitedUser := &libregraph.User{}
+	err = json.NewDecoder(res.Body).Decode(invitedUser)
+	if err != nil {
+		return nil, err
+	}
+
+	response := &invitations.Invitation{
+		InvitedUser: invitedUser,
+	}
+	if res.StatusCode == http.StatusCreated {
+		response.Status = "Completed"
+	}
+
+	// optionally send an email
+
+	return response, nil
 }