Add mail render method

pkg/mail/send_mail.go

@@ -30,6 +30,7 @@ import (
 
 // Opts holds infos for a mail
 type Opts struct {
+	From        string
 	To          string
 	Subject     string
 	Message     string
@@ -81,7 +82,10 @@ func SendTestMail(to string) error {
 // SendMail puts a mail in the queue
 func SendMail(opts *Opts) {
 	m := gomail.NewMessage()
-	m.SetHeader("From", config.MailerFromEmail.GetString())
+	if opts.From == "" {
+		opts.From = config.MailerFromEmail.GetString()
+	}
+	m.SetHeader("From", opts.From)
 	m.SetHeader("To", opts.To)
 	m.SetHeader("Subject", opts.Subject)
 	for _, h := range opts.Headers {

pkg/notifications/mail.go

@@ -16,6 +16,14 @@
 
 package notifications
 
+import (
+	"bytes"
+	"code.vikunja.io/api/pkg/mail"
+	"code.vikunja.io/api/pkg/static"
+	"code.vikunja.io/api/pkg/utils"
+	"github.com/shurcooL/httpfs/html/vfstemplate"
+)
+
 type Mail struct {
 	from       string
 	to         string
@@ -70,6 +78,44 @@ func (m *Mail) Line(line string) *Mail {
 	return m
 }
 
-func RenderMail(mail *Mail) {
+func RenderMail(m *Mail) (mailOpts *mail.Opts, err error) {
 
+	var htmlContent bytes.Buffer
+	var plainContent bytes.Buffer
+
+	t, err := vfstemplate.ParseGlob(static.Templates, nil, "*.tmpl")
+	if err != nil {
+		return
+	}
+
+	boundary := "np" + utils.MakeRandomString(13)
+
+	data := make(map[string]interface{})
+
+	data["Greeting"] = m.greeting
+	data["IntroLines"] = m.introLines
+	data["OutroLines"] = m.outroLines
+	data["ActionText"] = m.actionText
+	data["ActionURL"] = m.actionURL
+	data["Boundary"] = boundary
+
+	if err := t.ExecuteTemplate(&htmlContent, "mail-notification.html.tmpl", data); err != nil {
+		return
+	}
+
+	if err := t.ExecuteTemplate(&plainContent, "mail-notification.plain.tmpl", data); err != nil {
+		return
+	}
+
+	mailOpts = &mail.Opts{
+		From:        m.from,
+		To:          m.to,
+		Subject:     m.subject,
+		ContentType: mail.ContentTypeMultipart,
+		Message:     plainContent.String(),
+		HTMLMessage: htmlContent.String(),
+		Boundary:    boundary,
+	}
+
+	return mailOpts, nil
 }

templates/mail/mail-notification.html.tmpl

@@ -0,0 +1,31 @@
+{{template "mail-header.tmpl" .}}
+<p>
+    {{ .Greeting }}
+</p>
+
+{{ range $line := .IntroLines}}
+    <p>
+        {{ $line }}
+    </p>
+{{ end }}
+
+{{ if .ActionURL }}
+    <a href="{{ .ActionULR }}" title="{{ .ActionText }}"
+       style="-webkit-box-shadow: 0.3em 0.3em 1em #b2d0ff; box-shadow: 0.3em 0.3em 1em #b2d0ff; background-color: #1973ff; border-color: transparent; color: #fff; text-decoration: none; text-align: center; text-rendering: optimizelegibility; text-transform: uppercase; font-weight: bold; font-size: 14px; padding: 10px 14px; margin: 10px auto; border-radius: 4px; user-select: none; display: block; width: 280px;font-family:sans-serif">
+        {{ .ActionText }}
+    </a>
+{{end}}
+
+{{ range $line := .OutroLines}}
+    <p>
+        {{ $line }}
+    </p>
+{{ end }}
+
+{{ if .ActionURL }}
+    <p>
+        If the button above doesn't work, copy the url below and paste it in your browsers address bar:<br/>
+        {{ .ActionURL }}
+    </p>
+{{ end }}
+{{template "mail-footer.tmpl"}}

templates/mail/mail-notification.plain.tmpl

@@ -0,0 +1,14 @@
+{{ .Greeting }}
+
+{{ range $line := .IntroLines}}
+    {{ $line }}
+{{ end }}
+
+{{ if .ActionURL }}
+    {{ .ActionText }}:
+    {{ .ActionURL }}
+{{end}}
+
+{{ range $line := .OutroLines}}
+    {{ $line }}
+{{ end }}