working on auth.
mailer, basic setup with html template and a dev treansport
This commit is contained in:
72
mailer/mailer.go
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72
mailer/mailer.go
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package mailer
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import (
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"errors"
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"net/mail"
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"gitserver.in/patialtech/rano/config"
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)
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type (
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transporter interface {
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send(*message) error
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}
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Recipients struct {
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To []mail.Address `json:"to"`
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Cc []mail.Address `json:"cc"`
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Bcc []mail.Address `json:"bcc"`
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}
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message struct {
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From string `json:"from" validate:"required"`
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Recipients Recipients `json:"recipients" validate:"required"`
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Subject string `json:"subject" validate:"required"`
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HtmlBody string `json:"htmlBody" validate:"required"`
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ReplyTo *mail.Address `json:"replyTo"`
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}
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Template interface {
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Subject() string
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HtmlBody() (string, error)
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}
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)
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func Send(to []mail.Address, tpl Template) error {
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return send(Recipients{To: to}, tpl)
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}
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func SendCC(subject string, to, cc []mail.Address, tpl Template) error {
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return send(Recipients{To: to, Cc: cc}, tpl)
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}
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func send(recipients Recipients, tpl Template) error {
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if tpl == nil {
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return errors.New("mailer: email template is nil")
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}
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if len(recipients.To) == 0 {
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return errors.New("mailer: no recipient found")
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}
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// TODO remove recepient with bounce hiostory
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body, err := tpl.HtmlBody()
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if err != nil {
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return err
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}
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// get ENV based transporter and send mail
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return getTransporter().send(&message{
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From: config.Read().MailerFrom,
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Recipients: recipients,
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Subject: tpl.Subject(),
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HtmlBody: body,
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})
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}
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func getTransporter() transporter {
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switch config.AppEnv {
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default:
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return transportDev{}
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}
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}
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120
mailer/message/_layout.html
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120
mailer/message/_layout.html
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{{define "layout"}}
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<html lang="en">
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<head>
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<meta name="viewport" content="width=device-width" />
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>{{.Title}}</title>
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</head>
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<body
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style="
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background-color: #f2f2f2;
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margin: 0;
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font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
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font-size: 16px;
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"
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>
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<table cellpadding="0" cellspacing="0" border="0" bgcolor="#ffffff" align="center" style="width: 100%">
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<tbody>
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<tr style="border-collapse: collapse">
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<td align="center" bgcolor="#f2f2f2" style="border-collapse: collapse; padding: 15px">
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<table
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cellpadding="0"
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cellspacing="0"
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border="0"
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bgcolor="#ffffff"
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style="
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width: 640px;
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border: 2px solid #77808a;
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background-color: #ffffff;
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text-align: left;
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padding: 0;
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margin: 0;
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"
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>
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<tbody>
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<tr style="border-collapse: collapse">
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<td style="border-collapse: collapse; padding: 15px">
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<table>
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<tbody>
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<tr style="border-collapse: collapse">
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<td style="border-collapse: collapse; padding: 0; vertical-align: top; width: 200px">
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<img
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src="{{.WebAssetsURL}}/mailer-logo.png"
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alt="logo"
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title="{{.Title}}"
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style="outline: none; text-decoration: none; display: block; max-width: 175px"
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/>
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</td>
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<td
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style="
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border-collapse: collapse;
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padding: 0;
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vertical-align: top;
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text-align: right;
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width: 100%;
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"
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>
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</td>
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</tr>
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</tbody>
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</table>
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</td>
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</tr>
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<tr class="m_-6736051552126560803borderRow" style="border-collapse: collapse">
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<td
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style="
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border-collapse: collapse;
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padding: 0;
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background-color: #e2e2e2;
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height: 1px;
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line-height: 0;
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"
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></td>
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</tr>
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<tr style="border-collapse: collapse">
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<td style="border-collapse: collapse; padding: 15px; overflow-wrap: anywhere">
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<div style="font-size: 1em; line-height: 1.4em">
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{{ template "content" .}}
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<p>Thank You!</p>
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</div>
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</td>
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</tr>
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</tbody>
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</table>
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</td>
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</tr>
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<tr style="border-collapse: collapse">
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<td align="center" bgcolor="#f2f2f2" style="border-collapse: collapse; padding: 15px">
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<table
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width="630"
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cellpadding="5px"
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cellspacing="0"
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border="0"
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style="width: 640px; font-size: 0.75em; color: #aaaaaa; text-align: left"
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>
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<tbody>
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<tr style="border-collapse: collapse">
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<td style="border-collapse: collapse; padding: 15px; padding-top: 0">
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<p style="color: #333; font-size: 0.875em; line-height: 1.4em; margin: 0 0 0.75em">
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<a href="{{.websiteURL}}" target="_blank" rel="noopener noreferrer">{{.websiteDomain}}</a>
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</p>
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{{if not .AllowReply}}
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<p>
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<small>
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<strong>** This is a system generated email, please do not reply to it **</strong>
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</small>
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</p>
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{{end}}
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</td>
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</tr>
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</tbody>
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</table>
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</td>
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</tr>
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</tbody>
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</table>
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</body>
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</html>
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{{end}}
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48
mailer/message/render.go
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48
mailer/message/render.go
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@@ -0,0 +1,48 @@
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package message
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import (
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"bytes"
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_ "embed"
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"html/template"
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"gitserver.in/patialtech/rano/config"
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"gitserver.in/patialtech/rano/mailer"
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"gitserver.in/patialtech/rano/util/structs"
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)
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//go:embed _layout.html
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var layout string
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type TplData struct {
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WebAssetsURL string
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mailer.Template
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}
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// render data in give HTML layout and content templates
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func render(layout string, content string, data mailer.Template) (string, error) {
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// layout
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tpl, err := template.New("layout").Parse(layout)
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if err != nil {
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return "", err
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}
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// content
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_, err = tpl.New("content").Parse(content)
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if err != nil {
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return "", err
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}
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// excute layout + content temaplte and render data
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buf := new(bytes.Buffer)
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d := structs.Map(data)
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d["Title"] = "My App"
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d["WebAssetsURL"] = config.Read().WebURL
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d["AllowReply"] = false
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err = tpl.ExecuteTemplate(buf, "layout", d)
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if err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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31
mailer/message/render_test.go
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31
mailer/message/render_test.go
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@@ -0,0 +1,31 @@
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package message
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import (
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"strings"
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"testing"
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)
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type testmail struct {
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Message string
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}
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func (t testmail) Subject() string {
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return "Test Test"
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}
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func (t testmail) HtmlBody() (string, error) {
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content := `<p>{{.Message}}</p>`
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return render(layout, content, t)
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}
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func TestRender(t *testing.T) {
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tpl := testmail{
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Message: "some mesage",
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}
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if b, err := tpl.HtmlBody(); err != nil {
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t.Error(err)
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} else if !strings.Contains(b, tpl.Message) {
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t.Error("supposed to contain:", tpl.Message)
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}
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}
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16
mailer/message/welcome.go
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16
mailer/message/welcome.go
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@@ -0,0 +1,16 @@
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package message
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type Welcome struct {
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Name string
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}
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func (e *Welcome) Subject() string {
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return "Welcome"
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}
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func (e *Welcome) HtmlBody() (string, error) {
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content := `
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<p>Welcome {{.Name}}</p>
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`
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return render(layout, content, e)
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}
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23
mailer/transport_dev.go
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23
mailer/transport_dev.go
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@@ -0,0 +1,23 @@
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package mailer
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import (
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"os"
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"path/filepath"
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"time"
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"gitserver.in/patialtech/rano/util/open"
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)
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type transportDev struct{}
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func (transportDev) send(msg *message) error {
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dir := os.TempDir()
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id := time.Now().Format("20060102T150405999")
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file := filepath.Join(dir, id+".html")
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if err := os.WriteFile(file, []byte(msg.HtmlBody), 0440); err != nil {
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return err
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}
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return open.WithDefaultApp(file)
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}
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