forked from Gonzih/feeds2imap-go
/
imap.go
218 lines (176 loc) · 4.58 KB
/
imap.go
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package feeds2imap
import (
"bytes"
"fmt"
"html/template"
"io"
"log"
"net/url"
"strings"
"time"
"github.com/emersion/go-imap/client"
"github.com/emersion/go-message/mail"
"github.com/mmcdole/gofeed"
"github.com/spf13/viper"
)
var templateFuncs = template.FuncMap{
"emptyString": func(s string) bool {
return len(s) == 0
},
}
var mailTemplate = template.Must(template.New("mail").
Funcs(templateFuncs).
Parse(`<style type="text/css">
@media only screen and (max-width: 480px){
.emailImage{
height:auto !important;
max-width:600px !important;
width: 100% !important;
}
}
</style>
<table>
<tbody>
<tr><td>
<a href="{{ .Link }}">{{ .Title }}</a>{{ if .Author | emptyString | not }} | {{ .Author }}{{ end }}
<hr>
</td></tr>
<tr><td>
{{ .Content }}
</td></tr>
</tbody>
</table>`))
type templatePayload struct {
Link string
Title string
Author string
Content template.HTML
}
func formatLink(rawLink string) string {
u, err := url.Parse(rawLink)
if err != nil {
log.Printf("Error parsing link \"%s\": %s", rawLink, err)
return rawLink
}
if u.Scheme == "" {
u.Scheme = "http"
}
return u.String()
}
func formatAuthor(item *gofeed.Item) string {
if item.Author != nil {
return fmt.Sprintf("%s %s", item.Author.Name, item.Author.Email)
}
return ""
}
func formatContent(item *gofeed.Item) (string, error) {
var payload templatePayload
payload.Author = formatAuthor(item)
payload.Link = formatLink(item.Link)
payload.Title = item.Title
var content string
if len(item.Content) > 0 {
content = item.Content
} else {
content = item.Description
}
content = strings.Replace(content, "<img ", "<img class='emailImage' ", -1)
payload.Content = template.HTML(content)
var buffer bytes.Buffer
err := mailTemplate.Execute(&buffer, payload)
if err != nil {
return "", err
}
return buffer.String(), nil
}
func newMessage(item *gofeed.Item, feedTitle string) (bytes.Buffer, error) {
var b bytes.Buffer
fromName := feedTitle
if len(fromName) == 0 {
fromName = viper.GetString("imap.from.name")
}
from := []*mail.Address{{fromName, viper.GetString("imap.from.email")}}
to := []*mail.Address{{viper.GetString("imap.to.name"), viper.GetString("imap.to.email")}}
mediaParams := map[string]string{"charset": "utf-8"}
h := mail.NewHeader()
h.SetContentType("multipart/alternative", mediaParams)
h.SetDate(*item.PublishedParsed)
h.SetAddressList("From", from)
h.SetAddressList("To", to)
h.SetSubject(item.Title)
messageWriter, err := mail.CreateWriter(&b, h)
defer messageWriter.Close()
if err != nil {
return b, err
}
htmlHeader := mail.NewTextHeader()
htmlHeader.SetContentType("text/html", mediaParams)
htmlWriter, err := messageWriter.CreateSingleText(htmlHeader)
defer htmlWriter.Close()
if err != nil {
return b, err
}
content, err := formatContent(item)
if err != nil {
return b, err
}
io.WriteString(htmlWriter, content)
return b, nil
}
func newIMAPClient() (*client.Client, error) {
hostPort := fmt.Sprintf("%s:%d", viper.GetString("imap.host"), viper.GetInt("imap.port"))
c, err := client.DialTLS(hostPort, nil)
if err != nil {
return c, err
}
if err := c.Login(viper.GetString("imap.username"), viper.GetString("imap.password")); err != nil {
return c, err
}
if viper.GetBool("debug") {
log.Println("Logged in to IMAP")
}
return c, nil
}
// AppendNewItemsViaIMAP puts items in to corresponding imap folders
func AppendNewItemsViaIMAP(items ItemsWithFolders) (ItemsWithFolders, error) {
client, err := newIMAPClient()
if err != nil {
return nil, err
}
defer client.Logout()
var i []ItemWithFolder
for _, entry := range items {
if entry.Item.PublishedParsed == nil {
t := time.Now()
entry.Item.PublishedParsed = &t
}
// folderName := entry.Folder
// FIXME: Always use feeds
folderName := "Feed"
if viper.GetBool("imap.folder.capitalize") {
folderName = strings.Title(folderName)
}
folder := fmt.Sprintf("%s/%s", viper.GetString("imap.folder.prefix"), folderName)
_ = client.Create(folder)
msg, err := newMessage(entry.Item, entry.FeedTitle)
if err != nil {
return nil, err
}
if viper.GetBool("debug") {
log.Printf("Appending '%s' by '%s' to %s", entry.Item.Title, entry.FeedTitle, folder)
}
literal := bytes.NewReader(msg.Bytes())
err = client.Append(folder, []string{}, *entry.Item.PublishedParsed, literal)
if err == nil {
// TODO intercept error
i = append(i, entry)
} else {
log.Printf("Error on connection. Restarting client")
client, err = newIMAPClient()
if err != nil {
return nil, err
}
}
}
return i, nil
}