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dex/email/template.go
2015-08-18 11:26:57 -07:00

79 lines
2.2 KiB
Go

package email
import (
"bytes"
"errors"
htmltemplate "html/template"
"text/template"
)
// NewTemplatizedEmailerFromGlobs creates a new TemplatizedEmailer, parsing the templates found in the given filepattern globs.
func NewTemplatizedEmailerFromGlobs(textGlob, htmlGlob string, emailer Emailer) (*TemplatizedEmailer, error) {
textTemplates, err := template.ParseGlob(textGlob)
if err != nil {
return nil, err
}
htmlTemplates, err := htmltemplate.ParseGlob(htmlGlob)
if err != nil {
return nil, err
}
return NewTemplatizedEmailerFromTemplates(textTemplates, htmlTemplates, emailer), nil
}
// NewTemplatizedEmailerFromTemplates creates a new TemplatizedEmailer, given root text and html templates.
func NewTemplatizedEmailerFromTemplates(textTemplates *template.Template, htmlTemplates *htmltemplate.Template, emailer Emailer) *TemplatizedEmailer {
return &TemplatizedEmailer{
emailer: emailer,
textTemplates: textTemplates,
htmlTemplates: htmlTemplates,
}
}
// TemplatizedEmailer sends emails based on templates, using any Emailer.
type TemplatizedEmailer struct {
textTemplates *template.Template
htmlTemplates *htmltemplate.Template
emailer Emailer
}
// SendMail queues an email to be sent to a recipient.
// SendMail has similar semantics to Emailer.SendMail, except that you provide
// the template names you want to base the message on instead of the actual
// text. "to", "from" and "subject" will be added into the data map regardless
// of if they are used.
func (t *TemplatizedEmailer) SendMail(from, subject, tplName string, data map[string]interface{}, to string) error {
if tplName == "" {
return errors.New("Must provide a template name")
}
textTpl := t.textTemplates.Lookup(tplName + ".txt")
htmlTpl := t.htmlTemplates.Lookup(tplName + ".html")
if textTpl == nil && htmlTpl == nil {
return ErrorNoTemplate
}
data["to"] = to
data["from"] = from
data["subject"] = subject
var textBuffer bytes.Buffer
if textTpl != nil {
err := textTpl.Execute(&textBuffer, data)
if err != nil {
return err
}
}
var htmlBuffer bytes.Buffer
if htmlTpl != nil {
err := htmlTpl.Execute(&htmlBuffer, data)
if err != nil {
return err
}
}
return t.emailer.SendMail(from, subject, textBuffer.String(), htmlBuffer.String(), to)
}