Add getSuggestions method

This method will be used to add suggestions for site.

src/services/url-parser.js

@@ -8,6 +8,31 @@ export function cleanUrl(url) {
   return matchesDomainName && matchesDomainName[1] ? matchesDomainName[1] : "";
 }
 
+function isAnIpAddressWithPort(address) {
+  return /^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}):(\d{1,5})$/.test(address);
+}
+
+export function getSuggestions(url) {
+  const cleanedUrl = cleanUrl(url) || url;
+  const urlElements = cleanedUrl.split(".");
+  if (isAnIpAddressWithPort(cleanedUrl) || urlElements.length < 2) {
+    return [];
+  }
+  const baseName = urlElements[urlElements.length - 2];
+  const tld = urlElements[urlElements.length - 1];
+  return urlElements.reduceRight(
+    (accumulator, currentValue) => {
+      const index = urlElements.indexOf(currentValue);
+      if (index >= 0 && index < urlElements.length - 2) {
+        const lastValue = accumulator[accumulator.length - 1];
+        accumulator.push(currentValue + "." + lastValue);
+      }
+      return accumulator;
+    },
+    [baseName, `${baseName}.${tld}`]
+  );
+}
+
 export function getSite() {
   return new Promise(resolve => {
     if (

test/unit/url-parser.js

@@ -1,7 +1,7 @@
 import test from "ava";
 import * as urlParser from "../../src/services/url-parser";
 
-test("getDomainName", t => {
+test("cleanUrl", t => {
   t.is("lesspass.com", urlParser.cleanUrl("https://lesspass.com/#!/"));
   t.is("lesspass.com", urlParser.cleanUrl("https://lesspass.com/api/"));
   t.is("api.lesspass.com", urlParser.cleanUrl("https://api.lesspass.com/"));
@@ -33,6 +33,30 @@ test("getDomainName", t => {
   t.is("", urlParser.cleanUrl("chrome://extensions/"));
 });
 
+test("getSuggestions", t => {
+  t.deepEqual(
+    ["bbc", "bbc.com", "www.bbc.com"],
+    urlParser.getSuggestions("https://www.bbc.com")
+  );
+  t.deepEqual(
+    ["example", "example.org", "www.example.org"],
+    urlParser.getSuggestions("https://www.example.org/api/?offset=100&limit=10")
+  );
+  t.deepEqual(
+    ["example", "example.org"],
+    urlParser.getSuggestions("https://example.org")
+  );
+  t.deepEqual(
+    ["example", "example.org"],
+    urlParser.getSuggestions("example.org")
+  );
+  t.deepEqual(
+    [],
+    urlParser.getSuggestions("https://192.168.1.1:10443/webapp/")
+  );
+  t.deepEqual([], urlParser.getSuggestions("example"));
+});
+
 test("getSite", t => {
   global.chrome = {
     tabs: {