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packager.go
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packager.go
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package common
import (
"bytes"
"fmt"
"strings"
"text/template"
"time"
"github.com/cloudfoundry-incubator/notifications/mail"
"github.com/pivotal-golang/conceal"
)
const HTMLWrapperTemplate = `{{.HTMLComponents.Doctype}}
<head>{{.HTMLComponents.Head}}</head>
<html>
<body {{.HTMLComponents.BodyAttributes}}>
{{.HTMLComponents.BodyContent}}
</body>
</html>`
type templatesLoader interface {
LoadTemplates(clientID, kindID, templateID string) (Templates, error)
}
type Packager struct {
templates templatesLoader
cloak conceal.CloakInterface
}
func NewPackager(templates templatesLoader, cloak conceal.CloakInterface) Packager {
return Packager{
templates: templates,
cloak: cloak,
}
}
func (packager Packager) PrepareContext(delivery Delivery, sender, domain string) (MessageContext, error) {
templates, err := packager.templates.LoadTemplates(delivery.ClientID, delivery.Options.KindID, delivery.Options.TemplateID)
if err != nil {
return MessageContext{}, err
}
return NewMessageContext(delivery, sender, domain, packager.cloak, templates), nil
}
func (packager Packager) Pack(context MessageContext) (mail.Message, error) {
parts, err := packager.CompileParts(context)
if err != nil {
return mail.Message{}, err
}
compiledSubject, err := packager.compileTemplate(context, context.SubjectTemplate, false)
if err != nil {
return mail.Message{}, err
}
return mail.Message{
From: context.From,
ReplyTo: context.ReplyTo,
To: context.To,
Subject: compiledSubject,
Body: parts,
Headers: []string{
fmt.Sprintf("X-CF-Client-ID: %s", context.ClientID),
fmt.Sprintf("X-CF-Notification-ID: %s", context.MessageID),
fmt.Sprintf("X-CF-Notification-Timestamp: %s", time.Now().Format(time.RFC3339Nano)),
fmt.Sprintf("X-CF-Notification-Request-Received: %s", context.RequestReceived.Format(time.RFC3339Nano)),
},
}, nil
}
func (packager Packager) CompileParts(context MessageContext) ([]mail.Part, error) {
var parts []mail.Part
var err error
context.Endorsement, err = packager.compileTemplate(context, context.Endorsement, false)
if err != nil {
return parts, err
}
if context.Text != "" {
plainText, err := packager.compileTemplate(context, context.TextTemplate, false)
if err != nil {
return parts, err
}
parts = append(parts, mail.Part{
ContentType: "text/plain",
Content: plainText,
})
}
if context.HTML != "" {
var err error
context.HTMLComponents.BodyContent, err = packager.compileTemplate(context, context.HTMLTemplate, true)
if err != nil {
return parts, err
}
htmlPart, err := packager.compileTemplate(context, HTMLWrapperTemplate, true)
if err != nil {
return parts, err
}
parts = append(parts, mail.Part{
ContentType: "text/html",
Content: htmlPart,
})
}
return parts, nil
}
func (packager Packager) compileTemplate(context MessageContext, theTemplate string, escapeContext bool) (string, error) {
buffer := bytes.NewBuffer([]byte{})
source, err := template.New("compileTemplate").Parse(theTemplate)
if err != nil {
return "", err
}
if escapeContext {
context.Escape()
}
source.Execute(buffer, context)
compiledTemplate := strings.TrimSuffix(buffer.String(), "\n")
return compiledTemplate, nil
}