func fetchAllHeaders(user, authToken, box string) ([]mail.Header, error) {
c, err := imap.DialTLS("imap.gmail.com:993", nil)
if err != nil {
return nil, err
}
_, err = c.Auth(oauthSASL{user, authToken})
if err != nil {
return nil, err
}
c.Select(box, true)
set, _ := imap.NewSeqSet("1:*")
cmd, err := imap.Wait(c.Fetch(set, "BODY.PEEK[HEADER.FIELDS (DATE)]"))
if err != nil {
return nil, err
}
headers := make([]mail.Header, 0, len(cmd.Data))
parseFailures := 0
for _, rsp := range cmd.Data {
header := imap.AsBytes(rsp.MessageInfo().Attrs["BODY[HEADER.FIELDS (DATE)]"]) // no peek
if msg, _ := mail.ReadMessage(bytes.NewReader(header)); msg != nil {
headers = append(headers, msg.Header)
} else {
parseFailures++
}
}
log.Printf("Finished processing %d emails with %d parse failures.\n", len(headers), parseFailures)
return headers, nil
}
func ExampleClient() {
//
// Note: most of error handling code is omitted for brevity
//
var (
c *imap.Client
cmd *imap.Command
rsp *imap.Response
)
// Connect to the server
c, _ = imap.Dial("imap.example.com")
// Remember to log out and close the connection when finished
defer c.Logout(30 * time.Second)
// Print server greeting (first response in the unilateral server data queue)
fmt.Println("Server says hello:", c.Data[0].Info)
c.Data = nil
// Enable encryption, if supported by the server
if c.Caps["STARTTLS"] {
c.StartTLS(nil)
}
// Authenticate
if c.State() == imap.Login {
c.Login("*****@*****.**", "mysupersecretpassword")
}
// List all top-level mailboxes, wait for the command to finish
cmd, _ = imap.Wait(c.List("", "%"))
// Print mailbox information
fmt.Println("\nTop-level mailboxes:")
for _, rsp = range cmd.Data {
fmt.Println("|--", rsp.MailboxInfo())
}
// Check for new unilateral server data responses
for _, rsp = range c.Data {
fmt.Println("Server data:", rsp)
}
c.Data = nil
// Open a mailbox (synchronous command - no need for imap.Wait)
c.Select("INBOX", true)
fmt.Print("\nMailbox status:\n", c.Mailbox)
// Fetch the headers of the 10 most recent messages
set, _ := imap.NewSeqSet("")
if c.Mailbox.Messages >= 10 {
set.AddRange(c.Mailbox.Messages-9, c.Mailbox.Messages)
} else {
set.Add("1:*")
}
cmd, _ = c.Fetch(set, "RFC822.HEADER")
// Process responses while the command is running
fmt.Println("\nMost recent messages:")
for cmd.InProgress() {
// Wait for the next response (no timeout)
c.Recv(-1)
// Process command data
for _, rsp = range cmd.Data {
header := imap.AsBytes(rsp.MessageInfo().Attrs["RFC822.HEADER"])
if msg, _ := mail.ReadMessage(bytes.NewReader(header)); msg != nil {
fmt.Println("|--", msg.Header.Get("Subject"))
}
}
cmd.Data = nil
// Process unilateral server data
for _, rsp = range c.Data {
fmt.Println("Server data:", rsp)
}
c.Data = nil
}
// Check command completion status
if rsp, err := cmd.Result(imap.OK); err != nil {
if err == imap.ErrAborted {
fmt.Println("Fetch command aborted")
} else {
fmt.Println("Fetch error:", rsp.Info)
}
}
}
