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|
package imap
import (
"fmt"
"strings"
"sync"
"time"
"github.com/emersion/go-imap"
imapClient "github.com/emersion/go-imap/client"
"github.com/Necoro/feed2imap-go/internal/log"
)
const numberConns = 5
type connConf struct {
host string
delimiter string
toplevel Folder
}
type connection struct {
*connConf
mailboxes *mailboxes
c *imapClient.Client
}
type mailboxes struct {
mb map[string]*imap.MailboxInfo
mu sync.RWMutex
}
type Client struct {
connConf
mailboxes mailboxes
commander *commander
connections [numberConns]*connection
nextFreeIndex int
}
type Folder struct {
str string
delimiter string
}
func (f Folder) String() string {
return f.str
}
func (f Folder) Append(other Folder) Folder {
if f.delimiter != other.delimiter {
panic("Delimiters do not match")
}
return Folder{
str: f.str + f.delimiter + other.str,
delimiter: f.delimiter,
}
}
func (mbs *mailboxes) contains(elem Folder) bool {
mbs.mu.RLock()
defer mbs.mu.RUnlock()
_, ok := mbs.mb[elem.str]
return ok
}
func (mbs *mailboxes) add(elem *imap.MailboxInfo) {
mbs.mu.Lock()
defer mbs.mu.Unlock()
mbs.mb[elem.Name] = elem
}
func (conn *connection) Disconnect() bool {
if conn != nil {
connected := (conn.c.State() & imap.ConnectedState) != 0
_ = conn.c.Logout()
return connected
}
return false
}
func (client *Client) Disconnect() {
if client != nil {
client.stopCommander()
connected := false
for _, conn := range client.connections {
connected = conn.Disconnect() || connected
}
if connected {
log.Print("Disconnected from ", client.host)
}
}
}
func (client *Client) folderName(path []string) Folder {
return Folder{
strings.Join(path, client.delimiter),
client.delimiter,
}
}
func (client *Client) NewFolder(path []string) Folder {
return client.toplevel.Append(client.folderName(path))
}
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 (client *Client) EnsureFolder(folder Folder) error {
return client.commander.execute(ensureCommando{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
}
func (client *Client) PutMessages(folder Folder, messages []string) error {
return client.commander.execute(addCommando{folder, messages})
}
func (client *Client) createConnection(c *imapClient.Client) *connection{
if client.nextFreeIndex >= len(client.connections) {
panic("Too many connections")
}
conn := &connection{
connConf: &client.connConf,
mailboxes: &client.mailboxes,
c: c,
}
client.connections[client.nextFreeIndex] = conn
client.nextFreeIndex++
return conn
}
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 NewClient() *Client {
return &Client{
mailboxes: mailboxes{
mb: map[string]*imap.MailboxInfo{},
mu: sync.RWMutex{},
},
}
}
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