chore: generate feed

I could loop until hasNextPage is false, but I'm not sure if it is the
best solution. So, for now, only the first 100 posts will be added to
the file.

2 files changed, 60 insertions, 0 deletions

diff --git a/.env.example b/.env.example
index c4ddb0e..efeb49d 100644
--- a/.env.example
+++ b/.env.example
@@ -1,6 +1,12 @@
+FRONTEND_URL="https://www.frontend.com"
 BACKEND_URL="https://www.backend.com"
 GRAPHQL_ENDPOINT="/graphql"
 
+AUTHOR_NAME="Your Name"
+AUTHOR_EMAIL="your@email.com"
+AUTHOR_URL="https://www.yourWebsite.com/"
+FEED_DESCRIPTION="What you want..."
+
 NEXT_PUBLIC_GRAPHQL_API="$BACKEND_URL$GRAPHQL_ENDPOINT"
 
 # Use this only in development mode. It prevents "unable to verify the first
diff --git a/src/utils/helpers/rss.ts b/src/utils/helpers/rss.ts
new file mode 100644
index 0000000..42560cb
--- /dev/null
+++ b/src/utils/helpers/rss.ts
@@ -0,0 +1,54 @@
+import { config } from '@config/website';
+import { getPublishedPosts } from '@services/graphql/queries';
+import { ArticlePreview } from '@ts/types/articles';
+import { Feed } from 'feed';
+import { writeFileSync } from 'fs';
+
+const getAllPosts = async (): Promise<ArticlePreview[]> => {
+  const posts: ArticlePreview[] = [];
+  const postsList = await getPublishedPosts({ first: 100 });
+  posts.push(...postsList.posts);
+
+  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,
+    });
+  });
+
+  writeFileSync('./public/feed.xml', feed.rss2(), 'utf8');
+};