从 emersion/go-imap 获取原始消息

Question

使用 GO 库、emersion/go-imap（如果需要，使用 go-message）如何获取整个原始消息，以便我可以写入文本/eml 文件？

Answer 1

最终，我找到了如何获取整个原始消息。 这是我的代码，以防对其他人有帮助

package main

import (
    "crypto/tls"
    "github.com/emersion/go-imap"
    "github.com/emersion/go-imap/client"
    "log"
)

func main() {

    useStartTLS := true
    host := "mail.example.com"
    port := "143"
    uname := "yourusername"
    upass := "yoursecretpassword"

    hostport := host + ":" + port

    log.Println("Using host and port:-", hostport)
    log.Println("With User:-", uname)
    log.Println("Connecting to server...")

    // Connect to server
    c, err := client.Dial(hostport)

    //c.SetDebug(os.Stdout)

    if err != nil {
        log.Fatal(err)
    }
    log.Println("Connected")

    // Don't forget to logout
    defer c.Logout()

    if useStartTLS == true {

        ret, err := c.SupportStartTLS()
        if err != nil {
            log.Println("Error trying to determine whether StartTLS is supported.")
            log.Fatal(err)
        }

        if ret == false {
            log.Println("StartTLS is not supported.")
            log.Fatal(err)
        }

        log.Println("Good, StartTLS is supported.")

        // Start a TLS session
        tlsConfig := &tls.Config{ServerName: host}
        if err := c.StartTLS(tlsConfig); err != nil {
            log.Fatal(err)
        }
        log.Println("TLS started")
    }

    // Login
    if err := c.Login(uname, upass); err != nil {
        log.Fatal(err)
    }
    log.Println("Logged in")


    log.Println("Getting Last Message")

    // Select INBOX
    mbox, err := c.Select("INBOX", false)
    if err != nil {
        log.Fatal(err)
    }

    if mbox.Messages == 0 {
        log.Fatal("No message in mailbox")
    }

    // Get the last message
    seqset := new(imap.SeqSet)
    seqset.AddNum(mbox.Messages)  //since mbox.Messages is total number, this gets last

    // Get the whole message RAW
    items := []imap.FetchItem{imap.FetchRFC822,}

    messages := make(chan *imap.Message, 1)
    go func() {
        if err := c.Fetch(seqset, items, messages); err != nil {
            log.Fatal(err)
        }
    }()

    msg := <-messages
    if msg == nil {
        log.Fatal("Server didn't returned message")
    }

    for _, value := range msg.Body {
        len := value.Len()
        buf := make([]byte, len)
        n, err := value.Read(buf)
        if err != nil {
            log.Fatal(err)
        }
        if n != len {
            log.Fatal("Didn't read correct length")
        }
        println("+++++++++++++++++++++++Start of Raw Message +++++++++++++++++++++++++++++++")
        print(string(buf))
        println("+++++++++++++++++++++++End of Raw Message +++++++++++++++++++++++++++++++++")
    }

    log.Println("Done")
}

Answer 2

如何从响应正文中仅提取原因和状态代码？