Promisify fs exists

Author: jaxoncreed

lib/ldp.js

@@ -434,11 +434,11 @@ class LDP {
 
   async getAvailableUrl (hostname, containerURI, { slug = uuid.v1(), extension }) {
     let requestUrl = this.resourceMapper.resolveUrl(hostname, containerURI)
-    requestUrl.replace(/\/*$/, '/')
+    requestUrl = requestUrl.replace(/\/*$/, '/')
 
     const { path: containerFilePath } = await this.resourceMapper.mapUrlToFile({ url: requestUrl })
     let fileName = slug + extension
-    if (fs.existsSync(utilPath.join(containerFilePath, fileName))) {
+    if (await promisify(fs.exists)(utilPath.join(containerFilePath, fileName))) {
       fileName = `${uuid.v1()}-${fileName}`
     }