services: add snapchat support (#429)

* feat: snapchat support

* chore: remove redundancy

* chore: a bit of better matching

* chore: update readme

* refactor(snapchat): refactor story matching to use pickers

* fix: small fix to directly linked stories

* fix(snapchat): fix filenames

* chore: update readme

* ref(snapchat): rewrite service, new test, split redirects into a util

* fix(snapchat): small fixes

* chore: deepscan error fixed

* fix: remove debug logging

* fix(snapchat): fix merge, clean up code with new utils

* fix(snapchat): update with suggested changes

---------

Signed-off-by: Snazzah <7025343+Snazzah@users.noreply.github.com>
Co-authored-by: jj <log@riseup.net>

src/modules/sub/utils.js

@@ -45,6 +45,13 @@ export function cleanHTML(html) {
     return clean
 }
 
+export function getRedirectingURL(url) {
+    return fetch(url, { redirect: 'manual' }).then((r) => {
+        if ([301, 302, 303].includes(r.status) && r.headers.has('location'))
+            return r.headers.get('location');
+    }).catch(() => null);
+}
+
 export function merge(a, b) {
     for (const k of Object.keys(b)) {
         if (Array.isArray(b[k])) {