85 lines
3.0 KiB
Markdown
85 lines
3.0 KiB
Markdown
---
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date: "2019-02-12:00:00+02:00"
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title: "Mailer"
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draft: false
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type: "doc"
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menu:
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sidebar:
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parent: "practical instructions"
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---
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# Mailer
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This document explains how to use the mailer to send emails and what to do to create a new kind of email to be sent.
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## Sending emails
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**Note:** You should use mail templates whenever possible (see below).
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To send an email, use the function `mail.SendMail(options)`. The options are defined as follows:
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{{< highlight golang >}}
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type Opts struct {
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To string // The email address of the recipent
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Subject string // The subject of the mail
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Message string // The plaintext message in the mail
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HTMLMessage string // The html message
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ContentType ContentType // The content type of the mail. Can be either mail.ContentTypePlain, mail.ContentTypeHTML, mail.ContentTypeMultipart. You should set this according to the kind of mail you want to send.
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Boundary string
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Headers []*header // Other headers to set in the mail.
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}
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{{< /highlight >}}
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## Sending emails based on a template
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For each mail with a template, there are two email templates: One for plaintext emails, one for html emails.
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These are located in the `templates/mail` folder and follow the conventions of `template-name.{plain|hmtl}.tmpl`,
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both the plaintext and html templates are in the same folder.
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To send a mail based on a template, use the function `mail.SendMailWithTemplate(to, subject, tpl string, data map[string]interface{})`.
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`to` and `subject` are pretty much self-explanatory, `tpl` is the name of the template, without `.html.tmpl` or `.plain.tmpl`.
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`data` is a map you can pass additional data to your template.
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#### Sending a mail with a template
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A basic html email template would look like this:
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{{< highlight go-html-template >}}
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{{template "mail-header.tmpl" .}}
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<p>
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Hey there!<br/>
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This is a minimal html email example.<br/>
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{{.Something}}
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</p>
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{{template "mail-footer.tmpl"}}
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{{< /highlight >}}
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And the corresponding plaintext template:
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{{< highlight go-text-template >}}
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Hey there!
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This is a minimal html email example.
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{{.Something}}
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{{< /highlight >}}
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You would then call this like so:
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{{< highlight golang >}}
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data := make(map[string]interface{})
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data["Something"] = "I am some computed value"
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to := "test@example.com"
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subject := "A simple test mail"
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tpl := "demo" // Assuming you saved the templates as demo.plain.tmpl and demo.html.tmpl
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mail.SendMailWithTemplate(to, subject, tpl, data)
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{{< /highlight >}}
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The function does not return an error. If an error occures when sending a mail, it is logged but not returned because sending the mail happens asinchrounly.
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Notice the `mail-header.tmpl` and `mail-footer.tmpl` in the template. These populate some basic css, a box for your content and the vikunja logo.
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All that's left for you is to put the content in, which then will appear in a beautifully-styled box.
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Remeber, these are email templates. This is different from normal html/css, you cannot use whatever you want (because most of the clients are wayyy to outdated).
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