Allow custom "created" timestamps in user creation API (#22549)

Allow back-dating user creation via the `adminCreateUser` API operation.
`CreateUserOption` now has an optional field `created_at`, which can
contain a datetime-formatted string. If this field is present, the
user's `created_unix` database field will be updated to its value.

This is important for Blender's migration of users from Phabricator to
Gitea. There are many users, and the creation timestamp of their account
can give us some indication as to how long someone's been part of the
community.

The back-dating is done in a separate query that just updates the user's
`created_unix` field. This was the easiest and cleanest way I could
find, as in the initial `INSERT` query the field always is set to "now".

2 files changed, 69 insertions, 1 deletions

diff --git a/models/user/user.go b/models/user/user.go
index 0a43de743..7e896e26d 100644
--- a/models/user/user.go
+++ b/models/user/user.go
@@ -640,6 +640,11 @@ func CreateUser(u *User, overwriteDefault ...*CreateUserOverwriteOptions) (err e
 	u.IsRestricted = setting.Service.DefaultUserIsRestricted
 	u.IsActive = !(setting.Service.RegisterEmailConfirm || setting.Service.RegisterManualConfirm)
 
+	// Ensure consistency of the dates.
+	if u.UpdatedUnix < u.CreatedUnix {
+		u.UpdatedUnix = u.CreatedUnix
+	}
+
 	// overwrite defaults if set
 	if len(overwriteDefault) != 0 && overwriteDefault[0] != nil {
 		overwrite := overwriteDefault[0]
@@ -717,7 +722,15 @@ func CreateUser(u *User, overwriteDefault ...*CreateUserOverwriteOptions) (err e
 		return err
 	}
 
-	if err = db.Insert(ctx, u); err != nil {
+	if u.CreatedUnix == 0 {
+		// Caller expects auto-time for creation & update timestamps.
+		err = db.Insert(ctx, u)
+	} else {
+		// Caller sets the timestamps themselves. They are responsible for ensuring
+		// both `CreatedUnix` and `UpdatedUnix` are set appropriately.
+		_, err = db.GetEngine(ctx).NoAutoTime().Insert(u)
+	}
+	if err != nil {
 		return err
 	}
 
diff --git a/models/user/user_test.go b/models/user/user_test.go
index 525da531f..7a58d2f82 100644
--- a/models/user/user_test.go
+++ b/models/user/user_test.go
@@ -4,9 +4,11 @@
 package user_test
 
 import (
+	"context"
 	"math/rand"
 	"strings"
 	"testing"
+	"time"
 
 	"code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/db"
@@ -14,6 +16,7 @@ import (
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 
 	"github.com/stretchr/testify/assert"
@@ -252,6 +255,58 @@ func TestCreateUserEmailAlreadyUsed(t *testing.T) {
 	assert.True(t, user_model.IsErrEmailAlreadyUsed(err))
 }
 
+func TestCreateUserCustomTimestamps(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	// Add new user with a custom creation timestamp.
+	var creationTimestamp timeutil.TimeStamp = 12345
+	user.Name = "testuser"
+	user.LowerName = strings.ToLower(user.Name)
+	user.ID = 0
+	user.Email = "unique@example.com"
+	user.CreatedUnix = creationTimestamp
+	err := user_model.CreateUser(user)
+	assert.NoError(t, err)
+
+	fetched, err := user_model.GetUserByID(context.Background(), user.ID)
+	assert.NoError(t, err)
+	assert.Equal(t, creationTimestamp, fetched.CreatedUnix)
+	assert.Equal(t, creationTimestamp, fetched.UpdatedUnix)
+}
+
+func TestCreateUserWithoutCustomTimestamps(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	// There is no way to use a mocked time for the XORM auto-time functionality,
+	// so use the real clock to approximate the expected timestamp.
+	timestampStart := time.Now().Unix()
+
+	// Add new user without a custom creation timestamp.
+	user.Name = "Testuser"
+	user.LowerName = strings.ToLower(user.Name)
+	user.ID = 0
+	user.Email = "unique@example.com"
+	user.CreatedUnix = 0
+	user.UpdatedUnix = 0
+	err := user_model.CreateUser(user)
+	assert.NoError(t, err)
+
+	timestampEnd := time.Now().Unix()
+
+	fetched, err := user_model.GetUserByID(context.Background(), user.ID)
+	assert.NoError(t, err)
+
+	assert.LessOrEqual(t, timestampStart, fetched.CreatedUnix)
+	assert.LessOrEqual(t, fetched.CreatedUnix, timestampEnd)
+
+	assert.LessOrEqual(t, timestampStart, fetched.UpdatedUnix)
+	assert.LessOrEqual(t, fetched.UpdatedUnix, timestampEnd)
+}
+
 func TestGetUserIDsByNames(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())