degmods.com/src/pages/blog/loader.ts

import { filterForEventsTaggingId } from '@nostr-dev-kit/ndk'
import { NDKContextType } from 'contexts/NDKContext'
import { LoaderFunctionArgs, redirect } from 'react-router-dom'
import { toast } from 'react-toastify'
import { appRoutes } from 'routes'
import { log, LogType } from 'utils'
import { extractBlogDetails } from 'utils/blog'

export const blogRouteLoader =
  (ndkContext: NDKContextType) =>
  async ({ params }: LoaderFunctionArgs) => {
    const { naddr } = params
    if (!naddr) {
      log(true, LogType.Error, 'Required naddr.')
      return redirect(appRoutes.blogs)
    }

    try {
      const filter = filterForEventsTaggingId(naddr)

      if (!filter) {
        log(true, LogType.Error, 'Unable to create filter from blog naddr.')
        return redirect(appRoutes.blogs)
      }
      const event = await ndkContext.fetchEvent(filter)
      if (!event) {
        log(true, LogType.Error, 'Unable to fetch the blog event.')
        return null
      }

      const blogDetails = extractBlogDetails(event)

      return blogDetails
    } catch (error) {
      log(
        true,
        LogType.Error,
        'An error occurred in fetching blog details from relays',
        error
      )
      toast.error('An error occurred in fetching blog details from relays')
      return redirect(appRoutes.blogs)
    }
  }