Gmail API get messages where there are contacts included in the CC - gmail

Question

I'm trying to get all the messages where:
I cced someone
Someone has cced somebody to a message inbound to me.
I looked in the advanced search operators for some guides, but all I can see is specifying a contact to a cc: search operator, reference.
There's really no docs for searching all messages where there are someone who's being cced to a message. Be it SENT or INBOX
It would be good if someone can provide an answer to this.

Answer 1

Issue:
You want to list all messages where there Cc header is populated.
There's no way to directly filter out by whether any cc is present, just for a certain email address (i.e. cc:my_user#my_domain.com). That's the case for the API as well as the UI.
Solution:
In that case, I'd suggest the following worflow:
Call users.messages.list to list all messages in your mailbox. You'll have to handle pagination at this point, if you want to retrieve all messages, using pageToken and nextPageToken.
For each message id, call users.messages.get to get the corresponding message (only id and threadId are returned from list).
Filter out messages that don't have the Cc header.
Code sample:
For example, in Apps Script you could do something like this (pagination is not implemented in this sample):
function getCcMessages() {
const userId = "me";
const { messages } = Gmail.Users.Messages.list(userId);
const messageIds = messages.map(m => m["id"]);
const optionalArgs = {
format: "METADATA",
metadataHeaders: "Cc"
}
const ccMessages = messageIds.map(id => {
const message = Gmail.Users.Messages.get(userId, id, optionalArgs);
return message;
}).filter(m => {
const headers = m["payload"]["headers"];
return headers;
});
return ccMessages;
}