(C#) IMAP Read PEC Email of Aruba and Extract the Invoice XML Files

IMAP Read PEC Email of Aruba and Extract the Invoice XML Files.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Imap imap = new Chilkat.Imap();

// Connect using TLS.
imap.Ssl = true;
imap.Port = 993;
bool success = imap.Connect("imap.example.com");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Authenticate
success = imap.Login("email_account_login","email_account_password");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox/postacert");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Search for messages having "POSTA CERTIFICATA: Invio File" in the subject.
bool fetchUids = true;
Chilkat.MessageSet messageSet = imap.Search("SUBJECT \"POSTA CERTIFICATA: Invio File\"",fetchUids);
if (imap.LastMethodSuccess == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

if (messageSet.Count < 1) {
    Debug.WriteLine("No messages found.");

    return;
}

// For our example, we'll process only the 1st email in the messageSet.
// Download the MIME source of the email into a StringBuilder object.
Chilkat.Email email = imap.FetchSingle(messageSet.GetId(0),messageSet.HasUids);
if (imap.LastMethodSuccess == false) {
    Debug.WriteLine(imap.LastErrorText);

    return;
}

// The email should contain an attached email.
// The Invoice XML is contained within the attached email.
Chilkat.Email attachedEmail = email.GetAttachedMessage(0);
if (email.LastMethodSuccess == false) {
    Debug.WriteLine(email.LastErrorText);

    return;
}

// Get the MIME of the attached email..
Chilkat.StringBuilder sbMime = new Chilkat.StringBuilder();
success = attachedEmail.GetMimeSb(sbMime);

// Load it into a Chilkat MIME object.
Chilkat.Mime mime = new Chilkat.Mime();
success = mime.LoadMimeSb(sbMime);

// Examine the structure of the MIME.
Debug.WriteLine(mime.GetStructure("text"));

// The MIME has this structure:
// multipart/mixed
//     application/octet-stream
//     application/octet-stream     <-- This is where the XML is contained.   It is within an opaque signature.
//     text/plain

// The 2nd application/octet-stream MIME header looks like this:

// ------=_Part_329673_-1348225228.1579889273592
// Content-Type: application/octet-stream; name="SM99999_99aaa.xml.p7m"
// Content-Transfer-Encoding: base64
// Content-Disposition: attachment; filename="SM99999_99aaa.xml.p7m"

// Let's get the binary content of the .p7m
Chilkat.BinData bdP7m = new Chilkat.BinData();
// Get the 2nd sub-part, at index 1 because index 0 is the 1st sub-part.
Chilkat.Mime mimeP7m = mime.GetPart(1);
if (mime.LastMethodSuccess != true) {
    Debug.WriteLine("Failed to get 2nd sub-part. Perhaps the MIME does not have a 2nd sub-part?");
    return;
}

success = mimeP7m.GetBodyBd(bdP7m);

// Verify the signature, which also extracts the content contained within the opaque signature.
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
success = crypt.OpaqueVerifyBd(bdP7m);
if (success == false) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

// The bdP7m now contains the Invoice XML.
// Load it into an XML object.
Chilkat.Xml xml = new Chilkat.Xml();
success = xml.LoadBd(bdP7m,true);

Debug.WriteLine(xml.GetXml());

// We have XML such as the following:
// 
// <?xml version="1.0" encoding="windows-1252"?>
// <?xml-stylesheet type="text/xsl" href="fatturapa_v1.2.xsl"?>
// <p:FatturaElettronica versione="FPR12" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" 
//     xmlns:p="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2" 
//     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
//     <FatturaElettronicaHeader>
// 	...
//     </FatturaElettronicaHeader>
//     <FatturaElettronicaBody>
// 	...
//     </FatturaElettronicaBody>
// </p:FatturaElettronica>

// Use this online tool to generate parsing code from sample XML: 
// Generate Parsing Code from XML

Debug.WriteLine("success.");