(Objective-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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#import <CkoImap.h>
#import <CkoMessageSet.h>
#import <CkoEmail.h>
#import <CkoStringBuilder.h>
#import <CkoMime.h>
#import <CkoBinData.h>
#import <CkoCrypt2.h>
#import <CkoXml.h>

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

CkoImap *imap = [[CkoImap alloc] init];

// Connect using TLS.
imap.Ssl = YES;
imap.Port = [NSNumber numberWithInt:993];
BOOL success = [imap Connect: @"imap.example.com"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Authenticate
success = [imap Login: @"email_account_login" password: @"email_account_password"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = [imap SelectMailbox: @"Inbox/postacert"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Search for messages having "POSTA CERTIFICATA: Invio File" in the subject.
BOOL fetchUids = YES;
CkoMessageSet *messageSet = [imap Search: @"SUBJECT \"POSTA CERTIFICATA: Invio File\"" bUid: fetchUids];
if (imap.LastMethodSuccess == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

if ([messageSet.Count intValue] < 1) {
    NSLog(@"%@",@"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.
CkoEmail *email = [imap FetchSingle: [messageSet GetId: [NSNumber numberWithInt: 0]] bUid: messageSet.HasUids];
if (imap.LastMethodSuccess == NO) {
    NSLog(@"%@",imap.LastErrorText);

    return;
}

// The email should contain an attached email.
// The Invoice XML is contained within the attached email.
CkoEmail *attachedEmail = [email GetAttachedMessage: [NSNumber numberWithInt: 0]];
if (email.LastMethodSuccess == NO) {
    NSLog(@"%@",email.LastErrorText);

    return;
}

// Get the MIME of the attached email..
CkoStringBuilder *sbMime = [[CkoStringBuilder alloc] init];
success = [attachedEmail GetMimeSb: sbMime];

// Load it into a Chilkat MIME object.
CkoMime *mime = [[CkoMime alloc] init];
success = [mime LoadMimeSb: sbMime];

// Examine the structure of the MIME.
NSLog(@"%@",[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
CkoBinData *bdP7m = [[CkoBinData alloc] init];
// Get the 2nd sub-part, at index 1 because index 0 is the 1st sub-part.
CkoMime *mimeP7m = [mime GetPart: [NSNumber numberWithInt: 1]];
if (mime.LastMethodSuccess != YES) {
    NSLog(@"%@",@"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.
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
success = [crypt OpaqueVerifyBd: bdP7m];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

// The bdP7m now contains the Invoice XML.
// Load it into an XML object.
CkoXml *xml = [[CkoXml alloc] init];
success = [xml LoadBd: bdP7m autoTrim: YES];

NSLog(@"%@",[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

NSLog(@"%@",@"success.");