IMAP - how to correctly fetch header data?

From: Dominik Ritter via curl-users <curl-users_at_lists.haxx.se>
Date: Tue, 21 Feb 2023 13:55:33 +0100

Hi all,

since a couple of days I am exploring curl in order to retrieve mails.

Currently I struggle with the CURLOPT_CUSTOMREQUEST not providing all data.

I found a couple of very old sources in the WWW that had the same issue
but these are a couple of years old and I wonder if there is a solution?

What I tried so far is the following:

/        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);////       
curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, &debugger);////       
curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &trace);//// <--- trace
////        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
&writer_function);////        curl_easy_setopt(curl, CURLOPT_WRITEDATA,
&buffer);//// <--- buffer /

/        curl_easy_setopt(curl, CURLOPT_URL,
currentInbox.toStdString().c_str()); //
/

/        /* Perform the fetch */////        res =
curl_easy_perform(curl);//////        curl_easy_setopt(curl,
CURLOPT_CUSTOMREQUEST, "FETCH 1:* (RFC822.SIZE BODY[HEADER.FIELDS (from
to subject date)])");///

/        /* Perform the fetch */////        res =
curl_easy_perform(curl);//////        return
QString::fromUtf8(buffer.c_str()) + QString("TRACE STARTS HERE\n") +
QString::fromStdString(trace.c_str());/

The buffer that should contain all the data only has the summary:

/* 1 FETCH (RFC822.SIZE 1212 BODY[HEADER.FIELDS (FROM TO SUBJECT DATE)]
{126} /

/* 2 FETCH (RFC822.SIZE 2876 BODY[HEADER.FIELDS (FROM TO SUBJECT DATE)]
{153}/

//

/* 3 FETCH (RFC822.SIZE 268 BODY[HEADER.FIELDS (FROM TO SUBJECT DATE)]
{131}/

...

Only he trace got the data i wanted:

/[...]/

/* 1 FETCH (RFC822.SIZE 1212 BODY[HEADER.FIELDS (FROM TO SUBJECT DATE)]
{126} /

/Date: Sun, 12 Feb 2023 14:12:32 +0100/

//

/To: demo_at_domain.de/

//

/From: Dominik <dominik_at_domain.de>/

//

/Subject: Hallo/

/[...]/

Trying to do this without the CURLOPT_CUSTOMREQUEST is even worse

When i use

/curl_easy_setopt(curl, CURLOPT_URL;
"imaps://<domain>/;UID=1:*/;section=HEADER.FIELDS%20(From%20Date%20Subject)");/

The result from WRITEFUNCTION contains only the requested data from the
first mail and the trace is incomplete (first mail has no data - but the
rest of mails are displayed:


/Found bundle for host: 0x562c629b4260 [serially]/

//

/Re-using existing connection #0 with host mail.cadori.de/

//

/[CONN-0-0][CF-SSL] TLSv1.2 (OUT), TLS header, Supplemental data (23):/

//

/T/

//

/A005 UID FETCH 1:* BODY[HEADER.FIELDS (From Date Subject)]/

//

/[CONN-0-0][CF-SSL] TLSv1.2 (IN), TLS header, Supplemental data (23):/

//

/�/

//

/* 1 FETCH (UID 2 BODY[HEADER.FIELDS (FROM DATE SUBJECT)] {106}/

//

/Found 106 bytes to download/

//

/Written 106 bytes, 0 bytes are left for transfer/

//

/)/

//

/* 2 FETCH (UID 3 BODY[HEADER.FIELDS (FROM DATE SUBJECT)] {110}/

/Date: Sun, 12 Feb 2023 14:15:32 +0100/

//

/To: demo_at_domain.de/

//

/From: Dominik <dominik_at_domain.de>/

//

/Subject: TEST/


I can use the trace to get the data i need, but I wonder if there is a
better way? Is there any best practices?

Thank you

Dominik

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Received on 2023-02-21