fix: make sure to remove only failed PDF417 scans

lib/poller.js

@@ -144,20 +144,32 @@ const readdirRec = rootPath =>
     .then(_.flatten)
 
 const stat = path => fs.stat(path).then(_.set('path', path))
+const pathComponents = p => path.normalize(p).split(path.sep)
 
 // @see lib/customers.js:updateIdCardData()
 const cleanOldFailedPDF417Scans = () => {
+  const matcher = (c, pat) => typeof pat === 'function' ? pat(c) : c === pat
+  const PDF417ScanPathPattern = _.concat(
+    pathComponents(OPERATOR_DATA_DIR),
+    ["id-operator", s => /* customerid*/ true, "idcarddata", fname => path.extname(fname) === 'jpg']
+  )
+  const isPDF417Scan = entry => {
+    entry = pathComponents(entry.path)
+    return entry.length === PDF417ScanPathPattern.length
+      && _.isMatchWith(matcher, PDF417ScanPathPattern, pathComponents(entry.path))
+  }
+
   let old = new Date()
   old.setDate(old.getDate() - 2) // 2 days ago
   old = old.getTime()
 
-    /* NOTE: Small caveat to mtime: last time the file was written to. */
+  /* NOTE: Small caveat to mtime: last time the file was written to. */
   const isOld = filestat => filestat.mtimeMs < old
 
   readdirRec(path.join(OPERATOR_DATA_DIR, 'id-operator'))
     .then(entries => Promise.all(
       entries
-        .filter(entry => entry.isFile())
+        .filter(entry => entry.isFile() && isPDF417Scan(entry))
         .map(entry => stat(entry.path))
     ))
     .then(filestats => Promise.all(