Application Crash if blog doesn't exist

[byP4ndaDev]

Hey,
While I was testing out the portfolio, I noticed something.
If you go to https://portfolio-magicui.vercel.app/blog/hello-world the app will work as expected. But if you go to https://portfolio-magicui.vercel.app/blog/hello-world1 the app will show an Application error

This happens because of this line in src/app/blog/[slug]/page.tsx:

let post = await getPost(params.slug);

if (!post) {
    notFound();
}

To be more specific. The error will appear because of the return of getPost(), which is this code:

export async function getPost(slug: string) {
  const filePath = path.join("content", `${slug}.mdx`);
  let source = fs.readFileSync(filePath, "utf-8");
  const { content: rawContent, data: metadata } = matter(source);
  const content = await markdownToHTML(rawContent);
  return {
    source: content,
    metadata,
    slug,
  };
}

If there is no hello-world1.mdx in the content folder, the function will crash and invoke the server side error.

Solution / Fix

To fix this problem, I changed the function into this:

export async function getPost(slug: string) {
  try {
    const filePath = path.join("content", `${slug}.mdx`);
    let source = fs.readFileSync(filePath, "utf-8");
    const { content: rawContent, data: metadata } = matter(source);
    const content = await markdownToHTML(rawContent);
    return {
      source: content,
      metadata,
      slug,
    };
  } catch (error) {
    return {
      source: null,
      metadata: null,
      slug: null,
    };
  }
}

Now go to src/app/blog/[slug]/page.tsx and change this line

if (!post) {
    notFound();
}

To this

if (!post.slug) {
    notFound();
}

Your src/app/blog/[slug]/page.tsx should now look like this:

let post = await getPost(params.slug);

if (!post.slug) {
  notFound();
}

The generateMetaData should look like this

export async function generateMetadata({
  params,
}: {
  params: {
    slug: string;
  };
}): Promise<Metadata | undefined> {
  let post = await getPost(params.slug);

  if(post.source) {
    let {
      title,
      publishedAt: publishedTime,
      summary: description,
      image,
    } = post.metadata;
    let ogImage = image ? `${DATA.url}${image}` : `${DATA.url}/og?title=${title}`;
  
    return {
      title,
      description,
      openGraph: {
        title,
        description,
        type: "article",
        publishedTime,
        url: `${DATA.url}/blog/${post.slug}`,
        images: [
          {
            url: ogImage,
          },
        ],
      },
      twitter: {
        card: "summary_large_image",
        title,
        description,
        images: [ogImage],
      },
    };
  }
}

If you now go to a blog that doesn't exist, you will see the Error 404 - Page not Found Page and no error.

[dillionverma]

great find!

would you be interested in making a PR for this too?

[byP4ndaDev]

great find!

would you be interested in making a PR for this too?

Made the Pull request with my other Account @byPandaDev