Move old backend code to old_src folder

Signed-off-by: David Mehren <git@herrmehren.de>

old_src/lib/web/auth/dropbox/index.ts

@@ -0,0 +1,41 @@
+import { NextFunction, Request, Response, Router } from 'express'
+import passport from 'passport'
+import { Strategy as DropboxStrategy } from 'passport-dropbox-oauth2'
+import { config } from '../../../config'
+import { User } from '../../../models'
+import { AuthMiddleware } from '../interface'
+import { passportGeneralCallback } from '../utils'
+
+export const dropboxAuth = Router()
+
+export const DropboxMiddleware: AuthMiddleware = {
+  getMiddleware (): Router {
+    passport.use(new DropboxStrategy({
+      apiVersion: '2',
+      clientID: config.dropbox.clientID,
+      clientSecret: config.dropbox.clientSecret,
+      callbackURL: config.serverURL + '/auth/dropbox/callback'
+    }, (
+      accessToken: string,
+      refreshToken: string,
+      profile,
+      done: (err?: Error | null, user?: User) => void
+    ): void => {
+      // the Dropbox plugin wraps the email addresses in an object
+      // see https://github.com/florianheinemann/passport-dropbox-oauth2/blob/master/lib/passport-dropbox-oauth2/strategy.js#L146
+      profile.emails = profile.emails.map(element => element.value)
+      passportGeneralCallback(accessToken, refreshToken, profile, done)
+    }))
+
+    dropboxAuth.get('/auth/dropbox', function (req: Request, res: Response, next: NextFunction) {
+      passport.authenticate('dropbox-oauth2')(req, res, next)
+    })
+    dropboxAuth.get('/auth/dropbox/callback',
+      passport.authenticate('dropbox-oauth2', {
+        successReturnToOrRedirect: config.serverURL + '/',
+        failureRedirect: config.serverURL + '/'
+      })
+    )
+    return dropboxAuth
+  }
+}