Added setContentDisposition option

Resolves #192

This added 2 new dependencies:
content-disposition
BobbyWibowo/serve-static

content-disposition:
This has fallback generation for file names that are outside ISO-8859-1.
Plus it was already a sub-dependency due to express to begin with.

BobbyWibowo/serve-static:
A fork of express/serve-static to allow specifying an async setHeaders
function by the name preSetHeaders, that will be awaited before
creating send stream to clients.

config.sample.js

@@ -30,6 +30,12 @@ module.exports = {
   serveFilesWithNode: false,
   domain: 'https://lolisafe.moe',
 
+  /*
+    If you serve files with node, you can optionally choose to set Content-Disposition header
+    into their original file names. This allows users to save files into their original file names.
+  */
+  setContentDisposition: false,
+
   /*
     If you are serving your files with a different domain than your lolisafe homepage,
     then fill this option with your lolisafe homepage, otherwise any falsy value.

lolisafe.js

@@ -1,11 +1,13 @@
 const bodyParser = require('body-parser')
 const clamd = require('clamdjs')
+const contentDisposition = require('content-disposition')
 const express = require('express')
 const helmet = require('helmet')
 const nunjucks = require('nunjucks')
 const path = require('path')
 const RateLimit = require('express-rate-limit')
 const readline = require('readline')
+const serveStatic = require('serve-static')
 const config = require('./config')
 const logger = require('./logger')
 const versions = require('./src/versions')
@@ -65,6 +67,33 @@ let setHeaders = res => {
   res.set('Access-Control-Allow-Origin', '*')
 }
 
+const initServeStaticUploads = (opts = {}) => {
+  if (config.setContentDisposition) {
+    opts.preSetHeaders = async (res, path) => {
+      // Do only if accessing files from uploads' root directory (i.e. not thumbs, etc.)
+      // and only if they're GET requests
+      if (path.indexOf('/', 1) === -1 && res.req.method === 'GET') {
+        const name = path.substring(1)
+        try {
+          const file = await db.table('files')
+            .where('name', name)
+            .select('original')
+            .first()
+          res.set('Content-Disposition', contentDisposition(file.original, { type: 'inline' }))
+        } catch (error) {
+          logger.error(error)
+        }
+      }
+    }
+    // serveStatic is just a modified express/serve-static module that allows specifying
+    // an async setHeaders function by the name preSetHeaders.
+    // The module will wait for the said function before creating send stream to client.
+    safe.use('/', serveStatic(paths.uploads, opts))
+  } else {
+    safe.use('/', express.static(paths.uploads, opts))
+  }
+}
+
 // Cache control (safe.fiery.me)
 if (config.cacheControl) {
   const cacheControls = {
@@ -96,7 +125,7 @@ if (config.cacheControl) {
 
   // If serving uploads with node
   if (config.serveFilesWithNode)
-    safe.use('/', express.static(paths.uploads, {
+    initServeStaticUploads({
       setHeaders: res => {
         res.set('Access-Control-Allow-Origin', '*')
         // If using CDN, cache uploads in CDN as well
@@ -104,7 +133,7 @@ if (config.cacheControl) {
         if (config.cacheControl !== 2)
           res.set('Cache-Control', cacheControls.cdn)
       }
-    }))
+    })
 
   // Function for static assets.
   // This requires the assets to use version in their query string,
@@ -125,8 +154,7 @@ if (config.cacheControl) {
     next()
   })
 } else if (config.serveFilesWithNode) {
-  // If serving uploads with node
+  initServeStaticUploads()
-  safe.use('/', express.static(paths.uploads))
 }
 
 // Static assets

package.json

@@ -36,6 +36,7 @@
     "blake3": "~2.1.4",
     "body-parser": "~1.19.0",
     "clamdjs": "~1.0.2",
+    "content-disposition": "~0.5.3",
     "express": "~4.17.1",
     "express-rate-limit": "~5.1.3",
     "fluent-ffmpeg": "~2.1.2",
@@ -48,6 +49,7 @@
     "randomstring": "~1.1.5",
     "readline": "~1.3.0",
     "search-query-parser": "~1.5.5",
+    "serve-static": "git+https://git@github.com/BobbyWibowo/serve-static#60049dec396615ab738d29576a65432e4f9d7d4a",
     "sharp": "~0.26.0",
     "sqlite3": "~5.0.0",
     "systeminformation": "~4.27.3"

yarn.lock

@@ -1440,7 +1440,7 @@ contains-path@^0.1.0:
   resolved "https://registry.yarnpkg.com/contains-path/-/contains-path-0.1.0.tgz#fe8cf184ff6670b6baef01a9d4861a5cbec4120a"
   integrity sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=
 
-content-disposition@0.5.3:
+content-disposition@0.5.3, content-disposition@~0.5.3:
   version "0.5.3"
   resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-0.5.3.tgz#e130caf7e7279087c5616c2007d0485698984fbd"
   integrity sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==
@@ -6788,6 +6788,15 @@ serve-static@1.14.1:
     parseurl "~1.3.3"
     send "0.17.1"
 
+"serve-static@git+https://git@github.com/BobbyWibowo/serve-static#60049dec396615ab738d29576a65432e4f9d7d4a":
+  version "1.14.2"
+  resolved "git+https://git@github.com/BobbyWibowo/serve-static#60049dec396615ab738d29576a65432e4f9d7d4a"
+  dependencies:
+    encodeurl "~1.0.2"
+    escape-html "~1.0.3"
+    parseurl "~1.3.3"
+    send "0.17.1"
+
 set-blocking@^2.0.0, set-blocking@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"