[feature] Self-serve email change for users (#2957)

* [feature] Email change

* frontend stuff for changing email

* docs

* tests etc

* differentiate more clearly between local user+account and account

* populate user

1 files changed, 104 insertions, 0 deletions

diff --git a/internal/api/client/user/emailchange.go b/internal/api/client/user/emailchange.go
new file mode 100644
index 000000000..b2e25343f
--- /dev/null
+++ b/internal/api/client/user/emailchange.go
@@ -0,0 +1,104 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package user
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+// EmailChangePOSTHandler swagger:operation POST /api/v1/user/email_change userEmailChange
+//
+// Request changing the email address of authenticated user.
+//
+//	---
+//	tags:
+//	- user
+//
+//	consumes:
+//	- application/json
+//	- application/xml
+//	- application/x-www-form-urlencoded
+//
+//	produces:
+//	- application/json
+//
+//	security:
+//	- OAuth2 Bearer:
+//		- write:user
+//
+//	responses:
+//		'202':
+//			description: "Accepted: email change is processing; check your inbox to confirm new address."
+//			schema:
+//				"$ref": "#/definitions/user"
+//		'400':
+//			description: bad request
+//		'401':
+//			description: unauthorized
+//		'403':
+//			description: forbidden
+//		'406':
+//			description: not acceptable
+//		'409':
+//			description: "Conflict: desired email address already in use"
+//		'500':
+//			description: internal error
+func (m *Module) EmailChangePOSTHandler(c *gin.Context) {
+	authed, err := oauth.Authed(c, true, true, true, true)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	form := &apimodel.EmailChangeRequest{}
+	if err := c.ShouldBind(form); err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if form.Password == "" {
+		err := errors.New("email change request missing field password")
+		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	user, errWithCode := m.processor.User().EmailChange(
+		c.Request.Context(),
+		authed.User,
+		form.Password,
+		form.NewEmail,
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	apiutil.JSON(c, http.StatusAccepted, user)
+}