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worker/mapper.ts

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+import { Headers, ParsedMail, StructuredHeader } from 'mailparser'
+import { Attachment, PartialMessageMime } from './types';
+
+export const checkPartialContentType = (headers: Headers): PartialMessageMime['params'] | null => {
+  const contentType = headers.get('content-type') as StructuredHeader | undefined;
+  if (!contentType || !contentType.value || !contentType.value.includes('message/partial')) {
+    return null;
+  }
+
+  const params = contentType.params;
+
+  if (!params || !params.number || !params.total || !params.id) {
+    return null;
+  }
+
+  return {
+    number: parseInt(params.number),
+    total: parseInt(params.total),
+    id: params.id,
+  };
+}
+
+export const mapParsedMailToArticle = (article: ParsedMail, attachments: Attachment[]) => {
+  let references: string[] | string = article.headers.get('references') as string[] | string || [];
+  if (typeof references === 'string') {
+    references = [references];
+  }
+
+  const groups = article.headers.get('newsgroups') as string;
+  const xref = article.headers.get('xref') as string;
+  const parent = article.headers.get('in-reply-to') as string ?? references[references.length - 1];
+
+  return {
+    groups: groups.split(','),
+    subject: article.subject,
+    from: article.from?.text,
+    date: article.date,
+    articleId: article.messageId,
+    inGroups: xref.split(' ').map((group: string) => {
+      return {
+        groupName: group.split(':')[0],
+        messageNumber: group.split(':')[1],
+      }
+    }),
+    references,
+    parent,
+    text: article.text,
+    attachments: attachments,
+    headers: Object.fromEntries(article.headers),
+  };
+}