1 files changed, 39 insertions, 0 deletions

diff --git a/assets/js/pwa.js b/assets/js/pwa.js
new file mode 100644
index 0000000..74b3c68
--- /dev/null
+++ b/assets/js/pwa.js
@@ -0,0 +1,39 @@
+{{ $swfile := resources.Get "/sw.js" }}
+{{ $sw := $swfile | resources.Minify }}
+if('serviceWorker' in navigator) {
+    const PREFETCH = true;
+    const PREFETCH_LINK_RELS = ['index','next', 'prev', 'prefetch'];
+    function prefetchCache() {
+        if(navigator.serviceWorker.controller) {
+            let links = document.querySelectorAll(
+                PREFETCH_LINK_RELS.map((rel) => {
+                    return 'link[rel='+rel+']';
+                }).join(',')
+            );
+            if(links.length > 0) {
+                Array.from(links)
+                    .map((link) => {
+                        let href = link.getAttribute('href');
+                        navigator.serviceWorker.controller.postMessage({
+                            action : 'cache',
+                            url : href,
+                        });
+                    });
+            }
+        }
+    }
+
+    navigator.serviceWorker
+        .register('{{ $sw.Permalink | relURL }}', { scope: '/' })
+        .then(() => {
+            console.log('Service Worker Registered');
+        });
+
+    navigator.serviceWorker
+        .ready
+        .then(() => {
+            if(PREFETCH) {
+                prefetchCache();
+            }
+        });
+}
\ No newline at end of file