From c883470c2ef977b8675b12428591bb003694e235 Mon Sep 17 00:00:00 2001
From: René 'Necoro' Neumann <necoro@necoro.eu>
Date: Thu, 23 Apr 2020 20:48:17 +0200
Subject: Restructure imap pkg

---
 internal/imap/connection.go | 137 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 internal/imap/connection.go

(limited to 'internal/imap/connection.go')

diff --git a/internal/imap/connection.go b/internal/imap/connection.go
new file mode 100644
index 0000000..e0360bd
--- /dev/null
+++ b/internal/imap/connection.go
@@ -0,0 +1,137 @@
+package imap
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/emersion/go-imap"
+	imapClient "github.com/emersion/go-imap/client"
+
+	"github.com/Necoro/feed2imap-go/internal/log"
+)
+
+type connection struct {
+	*connConf
+	mailboxes *mailboxes
+	c         *imapClient.Client
+}
+
+func (conn *connection) startTls() error {
+	hasStartTls, err := conn.c.SupportStartTLS()
+	if err != nil {
+		return fmt.Errorf("checking for starttls for %s: %w", conn.host, err)
+	}
+
+	if hasStartTls {
+		if err = conn.c.StartTLS(nil); err != nil {
+			return fmt.Errorf("enabling starttls for %s: %w", conn.host, err)
+		}
+
+		log.Print("Connected to ", conn.host, " (STARTTLS)")
+	} else {
+		log.Print("Connected to ", conn.host, " (Plain)")
+	}
+
+	return nil
+}
+
+func (conn *connection) disconnect() bool {
+	if conn != nil {
+		connected := (conn.c.State() & imap.ConnectedState) != 0
+		_ = conn.c.Logout()
+		return connected
+	}
+	return false
+}
+
+func (conn *connection) createFolder(folder string) error {
+	err := conn.c.Create(folder)
+	if err != nil {
+		return fmt.Errorf("creating folder '%s': %w", folder, err)
+	}
+
+	err = conn.c.Subscribe(folder)
+	if err != nil {
+		return fmt.Errorf("subscribing to folder '%s': %w", folder, err)
+	}
+
+	log.Printf("Created folder '%s'", folder)
+
+	return nil
+}
+
+func (conn *connection) list(folder string) (*imap.MailboxInfo, int, error) {
+	mailboxes := make(chan *imap.MailboxInfo, 10)
+	done := make(chan error, 1)
+	go func() {
+		done <- conn.c.List("", folder, mailboxes)
+	}()
+
+	found := 0
+	var mbox *imap.MailboxInfo
+	for m := range mailboxes {
+		if found == 0 {
+			mbox = m
+		}
+		found++
+	}
+
+	if err := <-done; err != nil {
+		return nil, 0, fmt.Errorf("while listing '%s': %w", folder, err)
+	}
+
+	return mbox, found, nil
+}
+
+func (conn *connection) fetchDelimiter() (string, error) {
+	mbox, _, err := conn.list("")
+	if err != nil {
+		return "", err
+	}
+
+	return mbox.Delimiter, nil
+}
+
+func (conn *connection) ensureFolder(folder Folder) error {
+	if conn.mailboxes.contains(folder) {
+		return nil
+	}
+
+	log.Printf("Checking for folder '%s'", folder)
+
+	mbox, found, err := conn.list(folder.str)
+	if err != nil {
+		return err
+	}
+
+	if mbox != nil && mbox.Delimiter != folder.delimiter {
+		panic("Delimiters do not match")
+	}
+
+	switch found {
+	case 0:
+		return conn.createFolder(folder.str)
+	case 1:
+		conn.mailboxes.add(mbox)
+		return nil
+	default:
+		return fmt.Errorf("Found multiple folders matching '%s'.", folder)
+	}
+}
+
+func (conn *connection) putMessages(folder Folder, messages []string) error {
+	if len(messages) == 0 {
+		return nil
+	}
+
+	now := time.Now()
+	for _, msg := range messages {
+		reader := strings.NewReader(msg)
+		if err := conn.c.Append(folder.str, nil, now, reader); err != nil {
+			return fmt.Errorf("uploading message to %s: %w", folder, err)
+		}
+	}
+
+	return nil
+}
-- 
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