Started with mail creation

1 files changed, 85 insertions, 0 deletions

diff --git a/internal/feed/mail.go b/internal/feed/mail.go
new file mode 100644
index 0000000..d166e09
--- /dev/null
+++ b/internal/feed/mail.go
@@ -0,0 +1,85 @@
+package feed
+
+import (
+	"bytes"
+	"io"
+	"time"
+
+	"github.com/emersion/go-message/mail"
+
+	"github.com/Necoro/feed2imap-go/internal/config"
+)
+
+func address(name, address string) []*mail.Address {
+	return []*mail.Address{{name, address}}
+}
+
+func fromAdress(feed Feed, item feeditem, cfg config.Config) []*mail.Address {
+	switch {
+	case item.Item.Author != nil && item.Item.Author.Email != "":
+		return address(item.Item.Author.Name, item.Item.Author.Email)
+	case item.Item.Author != nil && item.Item.Author.Name != "":
+		return address(item.Item.Author.Name, cfg.DefaultEmail)
+	case item.Feed.Author != nil && item.Feed.Author.Email != "":
+		return address(item.Feed.Author.Name, item.Feed.Author.Email)
+	case item.Feed.Author != nil && item.Feed.Author.Name != "":
+		return address(item.Feed.Author.Name, cfg.DefaultEmail)
+	default:
+		return address(feed.Name, cfg.DefaultEmail)
+	}
+}
+
+func asMail(feed Feed, item feeditem, cfg config.Config) (string, error) {
+	var b bytes.Buffer
+
+	var h mail.Header
+	h.SetAddressList("From", fromAdress(feed, item, cfg))
+	h.SetAddressList("To", address(feed.Name, cfg.DefaultEmail))
+
+	{ // date
+		date := item.Item.PublishedParsed
+		if date == nil {
+			now := time.Now()
+			date = &now
+		}
+		h.SetDate(*date)
+	}
+	{ // subject
+		subject := item.Item.Title
+		if subject == "" {
+			subject = item.Item.Published
+		}
+		if subject == "" {
+			subject = item.Item.Link
+		}
+		h.SetSubject(subject)
+	}
+
+	mw, err := mail.CreateWriter(&b, h)
+	if err != nil {
+		return "", err
+	}
+
+	if cfg.WithPartText() {
+		tw, err := mw.CreateInline()
+		if err != nil {
+			return "", err
+		}
+
+		var th mail.InlineHeader
+		th.SetContentType("text/plain", map[string]string{"charset": "utf-8", "format": "flowed"})
+
+		w, err := tw.CreatePart(th)
+		if err != nil {
+			return "", err
+		}
+		_, _ = io.WriteString(w, "Who are you?")
+
+		_ = w.Close()
+		_ = tw.Close()
+	}
+
+	_ = mw.Close()
+
+	return b.String(), nil
+}