1 files changed, 77 insertions, 0 deletions

diff --git a/server/helpers/express-utils.ts b/server/helpers/express-utils.ts
new file mode 100644
index 000000000..d023117a8
--- /dev/null
+++ b/server/helpers/express-utils.ts
@@ -0,0 +1,77 @@
+import * as express from 'express'
+import * as multer from 'multer'
+import { CONFIG, REMOTE_SCHEME } from '../initializers'
+import { logger } from './logger'
+import { User } from '../../shared/models/users'
+import { generateRandomString } from './utils'
+
+function isNSFWHidden (res: express.Response) {
+  if (res.locals.oauth) {
+    const user: User = res.locals.oauth.token.User
+    if (user) return user.nsfwPolicy === 'do_not_list'
+  }
+
+  return CONFIG.INSTANCE.DEFAULT_NSFW_POLICY === 'do_not_list'
+}
+
+function getHostWithPort (host: string) {
+  const splitted = host.split(':')
+
+  // The port was not specified
+  if (splitted.length === 1) {
+    if (REMOTE_SCHEME.HTTP === 'https') return host + ':443'
+
+    return host + ':80'
+  }
+
+  return host
+}
+
+function badRequest (req: express.Request, res: express.Response, next: express.NextFunction) {
+  return res.type('json').status(400).end()
+}
+
+function createReqFiles (
+  fieldNames: string[],
+  mimeTypes: { [ id: string ]: string },
+  destinations: { [ fieldName: string ]: string }
+) {
+  const storage = multer.diskStorage({
+    destination: (req, file, cb) => {
+      cb(null, destinations[ file.fieldname ])
+    },
+
+    filename: async (req, file, cb) => {
+      const extension = mimeTypes[ file.mimetype ]
+      let randomString = ''
+
+      try {
+        randomString = await generateRandomString(16)
+      } catch (err) {
+        logger.error('Cannot generate random string for file name.', { err })
+        randomString = 'fake-random-string'
+      }
+
+      cb(null, randomString + extension)
+    }
+  })
+
+  const fields = []
+  for (const fieldName of fieldNames) {
+    fields.push({
+      name: fieldName,
+      maxCount: 1
+    })
+  }
+
+  return multer({ storage }).fields(fields)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  isNSFWHidden,
+  getHostWithPort,
+  badRequest,
+  createReqFiles
+}