upload and retrieve document

Resources/public/module/async_upload/downloader.js

@@ -0,0 +1,67 @@
+var algo = 'AES-CBC';
+
+var initializeButtons = (root) => {
+    var
+        buttons = root.querySelectorAll('a[data-download-button]');
+    
+    for (let i = 0; i < buttons.length; i ++) {
+        initialize(buttons[i]);
+    }
+};
+
+var initialize = (button) => {
+    button.addEventListener('click', onClick);
+};
+
+var onClick = e => download(e.target);
+
+var download = (button) => {
+    console.log(button.dataset.key);
+    var
+        keyData = JSON.parse(button.dataset.key),
+        //keyData, // = JSON.parse(keyString),
+        ivData = JSON.parse(button.dataset.iv),
+        iv = new Uint8Array(ivData),
+        url = button.dataset.tempUrlGet,
+        data, key
+        ;
+    console.log('keyData', keyData);
+    console.log('iv', iv);
+    console.log('url', url);
+    
+    window.crypto.subtle.importKey('jwk', keyData, { name: algo, iv: iv}, false, ['decrypt'])
+            .then(nKey => {
+                key = nKey;
+                console.log(key);
+        
+                return window.fetch(url);
+            })
+            .then(r => {
+                if (r.ok) {
+                    return r.arrayBuffer();
+                } else {
+                    console.log(r);
+                    throw new Error(r.statusCode);
+                }
+            })
+            .then(buffer => {
+                return window.crypto.subtle.decrypt({ name: algo, iv: iv }, key, buffer);
+            })
+            .then(decrypted => {
+                var 
+                    blob = new Blob([decrypted]),
+                    url = window.URL.createObjectURL(blob)
+                    ;
+                button.href = url;
+                button.removeEventListener('click', onClick);
+            })
+            .catch(error => {
+                console.log(error);
+            })
+            ;
+};
+
+window.addEventListener('load', function(e) {
+    console.log('load');
+    initializeButtons(e.target);
+});