Scan inbox for emails from a certain sender

scaninbox.go

package main

import (
	"fmt"

	"github.com/emersion/go-imap/v2"
	"github.com/emersion/go-imap/v2/imapclient"
)

func generateIdRange(startIdx, endIdx uint32) []uint32 {
	var x uint32
	var theSize = endIdx - startIdx
	var theSlice = make([]uint32, theSize)
	for x = 0; x < theSize; x++ {
		theSlice[x] = startIdx + x
	}
	return theSlice
}

func main() {

	client, client_err := imapclient.DialTLS("xxx.xxx.xxx:993", nil)
	if client_err != nil {
		fmt.Printf("Failed to dial IMAP server: %v", client_err)
	} else {
		fmt.Printf("Succesfully connected to IMAP server...\n")
	}
	defer client.Close()

	if client_err := client.Login("xxxxx", "xxxxx).Wait(); client_err != nil {
		fmt.Printf("Failed to login: %v", client_err)
	} else {
		fmt.Printf("Succesfully logged in...\n")
	}

	mailboxes, client_err := client.List("", "%", nil).Collect()
	if client_err != nil {
		fmt.Printf("Failed to list mailboxes: %v\n", client_err)
	} else {
		fmt.Printf("Found %v mailboxes\n", len(mailboxes))
		for _, mbox := range mailboxes {
			fmt.Printf(" - %v\n", mbox.Mailbox)
		}
	}

	selectedMbox, client_err := client.Select("INBOX", nil).Wait()
	if client_err != nil {
		fmt.Printf("Failed to select INBOX: %v\n", client_err)
	} else {
		fmt.Printf("INBOX contains %v messages\n", selectedMbox.NumMessages)
	}

	if selectedMbox.NumMessages > 0 {
		theArr := generateIdRange(1, selectedMbox.NumMessages)
		seqSet := imap.SeqSetNum(theArr...)

		fetchOptions := &imap.FetchOptions{Envelope: true}
		messages, client_err := client.Fetch(seqSet, fetchOptions).Collect()
		if client_err != nil {
			fmt.Printf("Failed to fetch first message in INBOX: %v\n", client_err)
		} else {
			fmt.Printf("Message(s) count: %d\n", len(messages))
			var x uint32
			for x = 0; x < selectedMbox.NumMessages-1; x++ {
				var sender = messages[x].Envelope.Sender[0].Mailbox + "@" + messages[x].Envelope.Sender[0].Host
				if sender == "[email protected]" {
					// OK this is email from [email protected]
					// Next step is grab the Excel attachment..... how
				}
			}
		}
	}

	if err := client.Logout().Wait(); err != nil {
		fmt.Printf("Failed to logout: %v\n", err)
	}
}