1 files changed, 92 insertions, 0 deletions
diff --git a/modules/templates/mailer.go b/modules/templates/mailer.go
new file mode 100644
index 0000000000..0cac1280f3
--- /dev/null
+++ b/modules/templates/mailer.go
@@ -0,0 +1,92 @@
+// Copyright 2022 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 templates
+
+import (
+	"context"
+	"html/template"
+	"io/fs"
+	"os"
+	"strings"
+	texttmpl "text/template"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/watcher"
+)
+
+// Mailer provides the templates required for sending notification mails.
+func Mailer(ctx context.Context) (*texttmpl.Template, *template.Template) {
+	for _, funcs := range NewTextFuncMap() {
+		subjectTemplates.Funcs(funcs)
+	}
+	for _, funcs := range NewFuncMap() {
+		bodyTemplates.Funcs(funcs)
+	}
+
+	refreshTemplates := func() {
+		for _, assetPath := range BuiltinAssetNames() {
+			if !strings.HasPrefix(assetPath, "mail/") {
+				continue
+			}
+
+			if !strings.HasSuffix(assetPath, ".tmpl") {
+				continue
+			}
+
+			content, err := BuiltinAsset(assetPath)
+			if err != nil {
+				log.Warn("Failed to read embedded %s template. %v", assetPath, err)
+				continue
+			}
+
+			assetName := strings.TrimPrefix(strings.TrimSuffix(assetPath, ".tmpl"), "mail/")
+
+			log.Trace("Adding built-in mailer template for %s", assetName)
+			buildSubjectBodyTemplate(subjectTemplates,
+				bodyTemplates,
+				assetName,
+				content)
+		}
+
+		if err := walkMailerTemplates(func(path, name string, d fs.DirEntry, err error) error {
+			if err != nil {
+				return err
+			}
+			if d.IsDir() {
+				return nil
+			}
+
+			content, err := os.ReadFile(path)
+			if err != nil {
+				log.Warn("Failed to read custom %s template. %v", path, err)
+				return nil
+			}
+
+			assetName := strings.TrimSuffix(name, ".tmpl")
+			log.Trace("Adding mailer template for %s from %q", assetName, path)
+			buildSubjectBodyTemplate(subjectTemplates,
+				bodyTemplates,
+				assetName,
+				content)
+			return nil
+		}); err != nil && !os.IsNotExist(err) {
+			log.Warn("Error whilst walking mailer templates directories. %v", err)
+		}
+	}
+
+	refreshTemplates()
+
+	if !setting.IsProd {
+		// Now subjectTemplates and bodyTemplates are both synchronized
+		// thus it is safe to call refresh from a different goroutine
+		watcher.CreateWatcher(ctx, "Mailer Templates", &watcher.CreateWatcherOpts{
+			PathsCallback:   walkMailerTemplates,
+			BetweenCallback: refreshTemplates,
+		})
+	}
+
+	return subjectTemplates, bodyTemplates
+}