teddit-reddit-frontend-alternativa/inc/teddit_api/handleSubreddit.js

module.exports = function() {
  const config = require('../../config')
  this.handleTedditApiSubreddit = async (json, req, res, from, api_type, api_target, subreddit) => {
    if(!config.api_enabled) {
      res.setHeader('Content-Type', 'application/json')
      let msg = { info: 'This instance do not support API requests. Please see https://codeberg.org/teddit/teddit#instances for instances that support API, or setup your own instance.' }
      return res.end(JSON.stringify(msg))
    }
    
    console.log('Teddit API request - subreddit')
    let _json = json // Keep the original json
    if(from === 'redis')
      json = JSON.parse(json)
    
    if(api_type === 'rss') {
      let protocol = (config.https_enabled ? 'https' : 'http')
      let items = ''
      for(var i = 0; i < json.data.children.length; i++) {
        let link = json.data.children[i].data
        let thumbnail = ''
        let post_image = ''
        let is_self_link = false
        let valid_reddit_self_domains = ['reddit.com']

        if(link.domain) {
          let tld = link.domain.split('self.')
          if(tld.length > 1) {
            if(!tld[1].includes('.')) {
              is_self_link = true
              link.url = teddifyUrl(link.url)
            }
          }
          if(config.valid_media_domains.includes(link.domain) || valid_reddit_self_domains.includes(link.domain)) {
            is_self_link = true
            link.url = teddifyUrl(link.url)
          }
        }
      
        if(link.preview && link.thumbnail !== 'self') {
          if(!link.url.startsWith('/r/') && isGif(link.url)) {
            let s = await downloadAndSave(link.thumbnail, 'thumb_')
            thumbnail = `${protocol}://${config.domain}${s}`
          } else {
            if(link.preview.images[0].resolutions[0]) {
              let s = await downloadAndSave(link.preview.images[0].resolutions[0].url, 'thumb_')
              thumbnail = `${protocol}://${config.domain}${s}`
              if(!isGif(link.url) && !link.post_hint.includes(':video')) {
                s = await downloadAndSave(link.preview.images[0].source.url)
                post_image = `${protocol}://${config.domain}${s}`
              }
            }
          }
        }
        
        if(link.preview && link.thumbnail !== 'self') {
          if(!link.url.startsWith('/r/') && isGif(link.url)) {
            images = {
              thumb: await downloadAndSave(link.thumbnail, 'thumb_')
            }
          } else {
            if(link.preview.images[0].resolutions[0]) {
              let preview = null
              if(!isGif(link.url) && !link.post_hint.includes(':video'))
                preview = await downloadAndSave(link.preview.images[0].source.url)
              images = {
                thumb: await downloadAndSave(link.preview.images[0].resolutions[0].url, 'thumb_'),
                preview: preview
              }
            }
          }
        }
            
        
        link.permalink = `${protocol}://${config.domain}${link.permalink}`
              
        if(is_self_link)
          link.url = link.permalink
        
        if(req.query.hasOwnProperty('full_thumbs')) {
          if(!post_image)
            post_image = thumbnail
          
          thumbnail = post_image
        }
        
        let enclosure = ''
        if(thumbnail != '') {
          let mime = ''
          let ext = thumbnail.split('.').pop()
          if(ext === 'png')
            mime = 'image/png'
          else
            mime = 'image/jpeg'
          enclosure = `<enclosure length="0" type="${mime}" url="${thumbnail}" />`
        }
        
        let append_desc_html = `<br/><a href="${link.url}">[link]</a> <a href="${link.permalink}">[comments]</a>`
        
        items += `
          <item>
            <title>${link.title}</title>
            <author>${link.author}</author>
            <created>${link.created}</created>
            <pubDate>${new Date(link.created_utc*1000).toGMTString()}</pubDate>
            <domain>${link.domain}</domain>
            <id>${link.id}</id>
            <thumbnail>${thumbnail}</thumbnail>
            ${enclosure}
            <link>${link.permalink}</link>
            <url>${link.url}</url>
            <description><![CDATA[${unescape(link.selftext_html)}${append_desc_html}]]></description>
            <num_comments>${link.num_comments}</num_comments>
            <ups>${link.ups}</ups>
            <stickied>${link.stickied}</stickied>
            <is_self_link>${is_self_link}</is_self_link>
          </item>
        `
      }
      
      let r_subreddit = '/r/' + subreddit
      let title = r_subreddit
      let link = `${protocol}://${config.domain}${r_subreddit}`
      if(subreddit === '/') {
        r_subreddit = 'frontpage'
        title = 'teddit frontpage'
        link = `${protocol}://${config.domain}`
      }
      
      let xml_output =
        `<?xml version="1.0" encoding="UTF-8"?>
        <rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" version="2.0">
          <channel>
            <atom:link href="${link}/?api&amp;type=rss" rel="self" type="application/rss+xml" />
            <title>${title}</title>
            <link>${link}</link>
            <description>Subreddit feed for: ${r_subreddit}</description>
            ${items}
          </channel>
        </rss>`
      res.setHeader('Content-Type', 'application/rss+xml')
      return res.end(xml_output)
    } else {
      res.setHeader('Content-Type', 'application/json')
      if(api_target === 'reddit') {
        return res.end(JSON.stringify(json))
      } else {
        let processed_json = await processJsonSubreddit(_json, from, null, req.cookies)
        
        let protocol = (config.https_enabled ? 'https' : 'http')
        for(var i = 0; i < processed_json.links.length; i++) {
          let link = processed_json.links[i]
          let valid_reddit_self_domains = ['reddit.com']
          let is_self_link = false

          if(link.domain) {
            let tld = link.domain.split('self.')
            if(tld.length > 1) {
              if(!tld[1].includes('.')) {
                is_self_link = true
                link.url = teddifyUrl(link.url)
              }
            }
            if(config.valid_media_domains.includes(link.domain) || valid_reddit_self_domains.includes(link.domain)) {
              is_self_link = true
              link.url = teddifyUrl(link.url)
            }
          }
          
          link.permalink = `${protocol}://${config.domain}${link.permalink}`
          
          if(is_self_link)
            link.url = link.permalink
        
          if(link.images) {
            if(link.images.thumb !== 'self') {
              link.images.thumb = `${protocol}://${config.domain}${link.images.thumb}`
            }
          }
        }
      
        return res.end(JSON.stringify(processed_json))
      }  
    }
  }
}