Initial QSfera import

Server/services/notifications/pkg/email/composer.go

@@ -0,0 +1,155 @@
+package email
+
+import (
+	"bytes"
+	"embed"
+	"strings"
+	"text/template"
+
+	"github.com/pkg/errors"
+
+	"github.com/qsfera/server/pkg/l10n"
+)
+
+var (
+	//go:embed l10n/locale
+	_translationFS embed.FS
+	_domain        = "notifications"
+)
+
+// NewTextTemplate replace the body message template placeholders with the translated template
+func NewTextTemplate(mt MessageTemplate, locale, defaultLocale string, translationPath string, vars map[string]string) (MessageTemplate, error) {
+	var err error
+	t := l10n.NewTranslatorFromCommonConfig(defaultLocale, _domain, translationPath, _translationFS, "l10n/locale").Locale(locale)
+	mt.Subject, err = composeMessage(t.Get(mt.Subject, []any{}...), vars)
+	if err != nil {
+		return mt, err
+	}
+	mt.Greeting, err = composeMessage(t.Get(mt.Greeting, []any{}...), vars)
+	if err != nil {
+		return mt, err
+	}
+	mt.MessageBody, err = composeMessage(t.Get(mt.MessageBody, []any{}...), vars)
+	if err != nil {
+		return mt, err
+	}
+	mt.CallToAction, err = composeMessage(t.Get(mt.CallToAction, []any{}...), vars)
+	if err != nil {
+		return mt, err
+	}
+	return mt, nil
+}
+
+// NewHTMLTemplate replace the body message template placeholders with the translated template
+func NewHTMLTemplate(mt MessageTemplate, locale, defaultLocale string, translationPath string, vars map[string]string) (MessageTemplate, error) {
+	var err error
+	t := l10n.NewTranslatorFromCommonConfig(defaultLocale, _domain, translationPath, _translationFS, "l10n/locale").Locale(locale)
+	mt.Subject, err = composeMessage(t.Get(mt.Subject, []any{}...), vars)
+	if err != nil {
+		return mt, err
+	}
+	mt.Greeting, err = composeMessage(newlineToBr(t.Get(mt.Greeting, []any{}...)), vars)
+	if err != nil {
+		return mt, err
+	}
+	mt.MessageBody, err = composeMessage(newlineToBr(t.Get(mt.MessageBody, []any{}...)), vars)
+	if err != nil {
+		return mt, err
+	}
+	mt.CallToAction, err = composeMessage(callToActionToHTML(t.Get(mt.CallToAction, []any{}...)), vars)
+	if err != nil {
+		return mt, err
+	}
+	return mt, nil
+}
+
+// NewGroupedTextTemplate replace the body message template placeholders with the translated template
+func NewGroupedTextTemplate(gmt GroupedMessageTemplate, vars map[string]string, locale, defaultLocale string, translationPath string, mts []MessageTemplate, mtsVars []map[string]string) (GroupedMessageTemplate, error) {
+	if len(mts) != len(mtsVars) {
+		return gmt, errors.New("number of templates does not match number of variables")
+	}
+
+	var err error
+	t := l10n.NewTranslatorFromCommonConfig(defaultLocale, _domain, translationPath, _translationFS, "l10n/locale").Locale(locale)
+	gmt.Subject, err = composeMessage(t.Get(gmt.Subject, []any{}...), vars)
+	if err != nil {
+		return gmt, err
+	}
+	gmt.Greeting, err = composeMessage(t.Get(gmt.Greeting, []any{}...), vars)
+	if err != nil {
+		return gmt, err
+	}
+
+	bodyParts := make([]string, 0, len(mtsVars))
+	for i, mt := range mts {
+		bodyPart, err := composeMessage(t.Get(mt.MessageBody, []any{}...), mtsVars[i])
+		if err != nil {
+			return gmt, err
+		}
+		bodyParts = append(bodyParts, bodyPart)
+	}
+	gmt.MessageBody = strings.Join(bodyParts, "\n\n\n")
+	return gmt, nil
+}
+
+// NewGroupedHTMLTemplate replace the body message template placeholders with the translated template
+func NewGroupedHTMLTemplate(gmt GroupedMessageTemplate, vars map[string]string, locale, defaultLocale string, translationPath string, mts []MessageTemplate, mtsVars []map[string]string) (GroupedMessageTemplate, error) {
+	if len(mts) != len(mtsVars) {
+		return gmt, errors.New("number of templates does not match number of variables")
+	}
+
+	var err error
+	t := l10n.NewTranslatorFromCommonConfig(defaultLocale, _domain, translationPath, _translationFS, "l10n/locale").Locale(locale)
+	gmt.Subject, err = composeMessage(t.Get(gmt.Subject, []any{}...), vars)
+	if err != nil {
+		return gmt, err
+	}
+	gmt.Greeting, err = composeMessage(newlineToBr(t.Get(gmt.Greeting, []any{}...)), vars)
+	if err != nil {
+		return gmt, err
+	}
+
+	bodyParts := make([]string, 0, len(mtsVars))
+	for i, mt := range mts {
+		bodyPart, err := composeMessage(t.Get(mt.MessageBody, []any{}...), mtsVars[i])
+		if err != nil {
+			return gmt, err
+		}
+		bodyParts = append(bodyParts, bodyPart)
+	}
+	gmt.MessageBody = strings.Join(bodyParts, "<br><br><br>")
+
+	return gmt, nil
+}
+
+// composeMessage renders the message based on template
+func composeMessage(tmpl string, vars map[string]string) (string, error) {
+	tpl, err := template.New("").Parse(replacePlaceholders(tmpl))
+	if err != nil {
+		return "", err
+	}
+	var writer bytes.Buffer
+	if err := tpl.Execute(&writer, vars); err != nil {
+		return "", err
+	}
+	return writer.String(), nil
+}
+
+func replacePlaceholders(raw string) string {
+	for o, n := range _placeholders {
+		raw = strings.ReplaceAll(raw, o, n)
+	}
+	return raw
+}
+
+func newlineToBr(s string) string {
+	return strings.Replace(s, "\n", "<br>", -1)
+}
+
+func callToActionToHTML(s string) string {
+	if strings.TrimSpace(s) == "" {
+		return ""
+	}
+	s = strings.TrimSuffix(s, "{ShareLink}")
+	return s + `<a href="{ShareLink}">{ShareLink}</a>`
+}