fix(logs): Log received chain comments (#28)

* log received

* Log received chain by comments

lib/auth.js

@@ -6,6 +6,7 @@ const { spf: checkSpf } = require('mailauth/lib/spf');
 const { dkimVerify } = require('mailauth/lib/dkim/verify');
 const { bimi } = require('mailauth/lib/bimi');
 const libmime = require('libmime');
+const { parseReceived } = require('mailauth/lib/parse-received');
 
 async function hookMail(plugin, connection, params) {
     const txn = connection?.transaction;
@@ -150,6 +151,14 @@ async function hookDataPost(stream, plugin, connection) {
         }
     }
 
+    const receivedChain = dkimResult?.headers?.parsed.filter(r => r.key === 'received').map(row => parseReceived(row.line));
+    const receivedChainComment = []
+        .concat(receivedChain || [])
+        .reverse()
+        .map(entry => entry?.by?.comment)
+        .filter(value => value)
+        .join(', ');
+
     for (let result of dkimResult?.results || []) {
         if (result.info) {
             connection.auth_results(result.info);
@@ -180,6 +189,7 @@ async function hookDataPost(stream, plugin, connection) {
             _dkim_body_size_source: result.sourceBodyLength,
             _dkim_body_size_canon: result.canonBodyLengthTotal,
             _dkim_body_size_limit: result.canonBodyLengthLimited && result.canonBodyLengthLimit,
+            _dkim_canon_mime_start: result.mimeStructureStart,
             _dkim_signing_headers: signingHeaders.join(','),
             _dkim_signing_headers_content_type: signingHeaders.includes('content-type') ? 'yes' : 'no',
             _spf_status: txn.notes.spfResult?.status?.result,
@@ -190,7 +200,8 @@ async function hookDataPost(stream, plugin, connection) {
             _bimi_comment: bimiResult?.status?.comment,
             _bimi_vmc: bimiResult?.status?.result === 'pass' && (bimiResult?.authority ? 'yes' : 'no'),
             _content_type_count: contentTypeHeaders.length,
-            _content_type_boundary: contentTypeHeaders.length ? contentTypeHeaders.at(-1)?.params?.boundary?.substr(0, 20) : null
+            _content_type_boundary: contentTypeHeaders.length ? contentTypeHeaders.at(-1)?.params?.boundary?.substr(0, 20) : null,
+            _received_by_comment: receivedChainComment
         });
     }
 }