Basic sending emails with templates but using fiber's templates doesn't work since it doesn't really support plain text.

common/email/api.go

@@ -6,9 +6,17 @@ import (
   "context"
   "log"
   "github.com/redis/go-redis/v9"
+  "github.com/gofiber/template/html/v2"
   "MY/webapp/config"
+  "strings"
 )
 
+var HTMLTemplates *html.Engine
+
+func init() {
+  HTMLTemplates = html.New("./emails", ".html")
+}
+
 func NewSender(ctx context.Context) (Sender){
   client := redis.NewClient(&redis.Options{
     Addr: config.Settings.Redis.HostPort,
@@ -56,8 +64,10 @@ func (router *Router) DeliverEmail(msg EmailMessage) error {
   if err != nil { return err }
 
   email_msg.Subject(msg.Subject)
-  email_msg.SetBodyString(mail.TypeTextPlain, msg.Text)
-  email_msg.SetBodyString(mail.TypeTextHTML, msg.HTML)
+
+  out := new(strings.Builder)
+  err = HTMLTemplates.Render(out, msg.HTMLTemplate, msg.Data)
+  email_msg.SetBodyString(mail.TypeTextHTML, out.String())
 
   if config.Settings.Email.XMailer != "" {
     email_msg.SetGenHeader(mail.HeaderXMailer, config.Settings.Email.XMailer)

common/email/data.go

@@ -10,8 +10,9 @@ type EmailMessage struct {
   To string
   From string
   Subject string
-  Text string
-  HTML string
+  Data any
+  TextTemplate string
+  HTMLTemplate string
 }
 
 type Sender struct {

emails/signup.html

@@ -0,0 +1,3 @@
+<h1>Welcome!</h1>
+
+<p>You signed up!</p>

features/email/api.go

@@ -11,8 +11,8 @@ func PostApiEmailSend(c *fiber.Ctx) error {
     To: c.FormValue("To"),
     From: c.FormValue("From"),
     Subject: c.FormValue("Subject"),
-    Text: c.FormValue("Message"),
-    HTML: c.FormValue("Message"),
+    TextTemplate: c.FormValue("Template"),
+    HTMLTemplate: c.FormValue("Template"),
   })
 
   return c.Redirect("/email/")

tools/cmd/qmgr/main.go

@@ -3,7 +3,6 @@ package main
 import (
   "MY/webapp/config"
   email "MY/webapp/common/email"
-  "fmt"
   "context"
 )
 
@@ -16,8 +15,8 @@ func main() {
     To: "tina.recip@example.com",
     From: "toni.sender@example.com",
     Subject: "This is my first mail.",
-    Text: fmt.Sprintf("Random number %v", 200),
-    HTML: fmt.Sprintf("<h1>Random number %v</h1>", 200),
+    TextTemplate: "signup",
+    HTMLTemplate: "signup",
   }
 
   sender := email.NewSender(ctx)

views/email/index.html

@@ -12,9 +12,9 @@
     <label for="Subject">Subject:</label>
     <input id="Subject" name="Subject">
 
-    <label for="Message">Message</label>
+    <label for="Template">Template</label>
 
-    <textarea id="Message" name="Message" cols="80" rows="10"></textarea>
+    <input id="Template" name="Template"></textarea>
 
     <input type="submit" value="Send!">
   </block>