gmail api error on sending message

[Niedzwiedzw]

Hi! when trying to send an email I'm getting an error as follows:

Caused by:
   0: sending email
   1: Bad Request: {"error":{"code":400,"errors":[{"domain":"global","message":"Recipient address required","reason":"invalidArgument"}],"message":"Recipient address required","status":"INVALID_ARGUMENT"}}

this is the code, I'd be glad if someone took a look!

        pub(crate) async fn send_email(email_request: EmailRequest) -> Result<()> {
            let EmailRequest { to, body, subject } = email_request;
            let auth = get_auth_on_behalf_of_me().await?;
            let hub = Gmail::new(hyper_client(), auth);
            let body = base64::encode_config(&body, base64::URL_SAFE);

            let headers: Vec<MessagePartHeader> = std::iter::empty()
                .chain(std::iter::once(MessagePartHeader {
                    name: Some("To".to_string()),
                    value: Some(to.to_string()),
                }))
                .chain(std::iter::once(MessagePartHeader {
                    name: Some("From".to_string()),
                    value: Some(Self::MY_EMAIL.to_string()),
                }))
                .chain(std::iter::once(MessagePartHeader {
                    name: Some("Subject".to_string()),
                    value: Some(subject.to_string()),
                }))
                .collect_vec();
            info!("sending email");

            const SCOPES: &[&str] = &[
                "https://mail.google.com/",
                "https://www.googleapis.com/auth/gmail.modify",
                "https://www.googleapis.com/auth/gmail.readonly",
                "https://www.googleapis.com/auth/gmail.metadata",
            ];
            let message = Message {
                payload: Some(MessagePart {
                    body: Some(MessagePartBody {
                        data: Some(body),
                        ..Default::default()
                    }),
                    headers: Some(headers),
                    ..Default::default()
                }),
                ..Default::default()
            };
            let req_builder = hub.users().messages_send(message, "me");
            let req_builder = SCOPES
                .iter()
                .fold(req_builder, |acc, next| acc.add_scope(next));
            let mut buffer = tempfile::tempfile().wrap_err("creating a temporary file")?;
            let mime_type = "message/rfc822"
                .parse()
                .map_err(|e| eyre::eyre!("bad mime type: {e:#?}"))?;
            req_builder
                .upload(&mut buffer, mime_type)
                .await
                .wrap_err("sending email")?;

            Ok(())
        }

[Byron]

let req_builder = hub.users().messages_send(message, "me");

My best guess is that unless "me" is an email address, like "me@example.com" it won't work. Otherwise I recommend using proxyman to look at the request actually sent and compare that to typical requests as documented in the gmail API docs (by Google).

[Niedzwiedzw]

I tried that too, but I'll look at proxyman data when I get a minute, thanks for replying and have a great day Byron