activitypub: go-fed conformant Clock instance

Signed-off-by: Loïc Dachary <loic@dachary.org>

modules/activitypub/clock.go

+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activitypub
+
+import (
+	"time"
+
+	"code.gitea.io/gitea/modules/setting"
+	"github.com/go-fed/activity/pub"
+)
+
+var _ pub.Clock = &Clock{}
+
+// Clock struct
+type Clock struct {
+}
+
+// NewClock function
+func NewClock() (c *Clock, err error) {
+	c = &Clock{}
+	return
+}
+
+// Now function
+func (c *Clock) Now() time.Time {
+	return time.Now().In(setting.DefaultUILocation)
+}

modules/activitypub/clock_test.go

+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activitypub
+
+import (
+	"regexp"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestClock(t *testing.T) {
+	DefaultUILocation := setting.DefaultUILocation
+	defer func() {
+		setting.DefaultUILocation = DefaultUILocation
+	}()
+	c, err := NewClock()
+	assert.NoError(t, err)
+	setting.DefaultUILocation, err = time.LoadLocation("UTC")
+	assert.NoError(t, err)
+	assert.Regexp(t, regexp.MustCompile(`\+0000$`), c.Now().Format(time.Layout))
+	setting.DefaultUILocation, err = time.LoadLocation("Europe/Paris")
+	assert.NoError(t, err)
+	assert.Regexp(t, regexp.MustCompile(`\+0[21]00$`), c.Now().Format(time.Layout))
+}