feat: add feeds (rss, atom, json)

1 files changed, 61 insertions, 0 deletions

diff --git a/src/utils/helpers/rss.ts b/src/utils/helpers/rss.ts
new file mode 100644
index 0000000..7851ff8
--- /dev/null
+++ b/src/utils/helpers/rss.ts
@@ -0,0 +1,61 @@
+import { config } from '@config/website';
+import { getPublishedPosts } from '@services/graphql/queries';
+import { ArticlePreview } from '@ts/types/articles';
+import { PostsList } from '@ts/types/blog';
+import { Feed } from 'feed';
+
+const getAllPosts = async (): Promise<ArticlePreview[]> => {
+  const posts: ArticlePreview[] = [];
+  let hasNextPage = true;
+  let after = undefined;
+
+  do {
+    const postsList: PostsList = await getPublishedPosts({ first: 10, after });
+    posts.push(...postsList.posts);
+    hasNextPage = postsList.pageInfo.hasNextPage;
+    after = postsList.pageInfo.endCursor;
+  } while (hasNextPage);
+
+  return posts;
+};
+
+export const generateFeed = async () => {
+  const websiteUrl = process.env.FRONTEND_URL ? process.env.FRONTEND_URL : '';
+  const author = {
+    name: config.name,
+    email: process.env.AUTHOR_EMAIL,
+    link: websiteUrl,
+  };
+  const copyright = `${config.name} CC BY SA ${config.copyright.startYear} - ${config.copyright.endYear}`;
+  const title = `${config.name} | ${config.baseline}`;
+
+  const feed = new Feed({
+    author,
+    copyright,
+    description: process.env.FEED_DESCRIPTION,
+    feedLinks: {
+      json: `${websiteUrl}/feed/json`,
+      atom: `${websiteUrl}/feed/atom`,
+    },
+    generator: 'Feed & NextJS',
+    id: websiteUrl,
+    language: config.defaultLocale,
+    link: websiteUrl,
+    title,
+  });
+
+  const posts = await getAllPosts();
+
+  posts.forEach((post) => {
+    feed.addItem({
+      content: post.intro,
+      date: new Date(post.dates.publication),
+      description: post.intro,
+      id: post.id,
+      link: `${websiteUrl}/article/${post.slug}`,
+      title: post.title,
+    });
+  });
+
+  return feed;
+};