fix download as PDF feature (#9)

src/routes.js

@@ -106,11 +106,13 @@ module.exports = (app, utils) => {
     return res.redirect(back)
   })
   
-  app.post('/wiki/Special::DownloadAsPdf', (req, res, next) => {
+  app.post(/DownloadAsPdf/, (req, res, next) => {
     if(!req.body.page) {
       return res.redirect('/')
     }
     
-    return res.redirect(`/w/index.php?title=Special%3ADownloadAsPdf&page=${req.body.page}&action=redirect-to-electron`)
+    let lang = req.body.lang || req.cookies.default_lang || config.default_lang
+    
+    return res.redirect(`/w/index.php?title=Special%3ADownloadAsPdf&page=${req.body.page}&action=redirect-to-electron&lang=${lang}`)
   })
 }

src/utils.js

@@ -171,6 +171,18 @@ module.exports = function(redis) {
         const wiki_href_regx = /(href=\"(https:|http:|)\/\/([A-z.-]+\.)?(wikipedia.org|wikimedia.org|wikidata.org|mediawiki.org))/gm
         data.html = data.html.replace(wiki_href_regx, `href="${protocol}${config.domain}`)
         
+        /**
+        * If we are on DownloadAsPdf page, we have to inject a input which
+        * holds the language value. Without this input, we can't access the
+        * language (not avail from the POST data).
+        * See more on https://codeberg.org/orenom/Wikiless/issues/9
+        */
+        if(url.includes('%3ADownloadAsPdf')) {
+          let lang_input = `<input type='hidden' name='lang' value='${lang}'>`
+          let replace_str = `<input type='hidden' name='page'`
+          data.html = data.html.replace(replace_str, `${lang_input}${replace_str}`)
+        }
+        
         redis.setex(url, config.setexs.wikipage, data.html, (error) => {
           if(error) {
             console.log(`Error setting the ${url} key to Redis. Error: ${error}`)