adding similarity check (#29)

* adding similarity check

* adding paging

* fixing tests

* docu

* better error handling

* fixing tests

* adjusting page limit

* fixing login screen

* cleanup

* upgrade browser list

* prevent spamming the log

* fixing tests

* removing job listings when removing a job or the user

lib/services/similarity-check/SimilarityCacheEntry.js

@@ -0,0 +1,36 @@
+const stringSimilarity = require('string-similarity');
+
+//if the score is higher than this, it will be considered a match
+const MAX_DICE_INDEX = 0.7;
+
+/**
+ * The similarity check is based on the dice coefficient. => https://en.wikipedia.org/wiki/S%C3%B8rensen%E2%80%93Dice_coefficient
+ *
+ * @type {module.SimilarityCacheEntry}
+ */
+module.exports = class SimilarityCacheEntry {
+  constructor(time) {
+    this.time = time;
+    this.values = [];
+  }
+
+  setCacheEntry = (entry) => {
+    this.values.push(entry);
+  };
+
+  getTime = () => {
+    return this.time;
+  };
+
+  hasSimilarEntries = (value) => {
+    if (this.values.length > 0) {
+      for (let i = 0; i < this.values.length; i++) {
+        const index = stringSimilarity.compareTwoStrings(value, this.values[i]);
+        if (index >= MAX_DICE_INDEX) {
+          return true;
+        }
+      }
+    }
+    return false;
+  };
+};