refactor: Extract copy to clipboard function

src/components/itemContextMenu.js

@@ -1,4 +1,5 @@
 import browser from '../scripts/browser';
+import { copy } from '../scripts/clipboard';
 import globalize from '../scripts/globalize';
 import actionsheet from './actionSheet/actionSheet';
 import { appHost } from './apphost';
@@ -366,32 +367,11 @@ import toast from './toast/toast';
                     break;
                 case 'copy-stream': {
                     const downloadHref = apiClient.getItemDownloadUrl(itemId);
-                    const textAreaCopy = function () {
+                    copy(downloadHref).then(() => {
-                        const textArea = document.createElement('textarea');
+                        toast(globalize.translate('CopyStreamURLSuccess'));
-                        textArea.value = downloadHref;
+                    }).catch(() => {
-                        document.body.appendChild(textArea);
+                        prompt(globalize.translate('CopyStreamURL'), downloadHref);
-                        textArea.focus();
+                    });
-                        textArea.select();
-
-                        if (document.execCommand('copy')) {
-                            toast(globalize.translate('CopyStreamURLSuccess'));
-                        } else {
-                            prompt(globalize.translate('CopyStreamURL'), downloadHref);
-                        }
-                        document.body.removeChild(textArea);
-                    };
-
-                    /* eslint-disable-next-line compat/compat */
-                    if (navigator.clipboard === undefined) {
-                        textAreaCopy();
-                    } else {
-                        /* eslint-disable-next-line compat/compat */
-                        navigator.clipboard.writeText(downloadHref).then(function () {
-                            toast(globalize.translate('CopyStreamURLSuccess'));
-                        }).catch(function () {
-                            textAreaCopy();
-                        });
-                    }
                     getResolveFunction(resolve, id)();
                     break;
                 }

src/scripts/clipboard.js

@@ -0,0 +1,45 @@
+/**
+ * Copies text to the clipboard using the textarea.
+ * @param {string} text - Text to copy.
+ * @returns {Promise<void>} Promise.
+ */
+function textAreaCopy(text) {
+    const textArea = document.createElement('textarea');
+    textArea.value = text;
+    document.body.appendChild(textArea);
+    textArea.focus();
+    textArea.select();
+
+    let ret;
+
+    try {
+        if (document.execCommand('copy')) {
+            ret = Promise.resolve();
+        } else {
+            ret = Promise.reject();
+        }
+    } catch (_) {
+        ret = Promise.reject();
+    }
+
+    document.body.removeChild(textArea);
+
+    return ret;
+}
+
+/**
+ * Copies text to the clipboard.
+ * @param {string} text - Text to copy.
+ * @returns {Promise<void>} Promise.
+ */
+export function copy(text) {
+    /* eslint-disable-next-line compat/compat */
+    if (navigator.clipboard === undefined) {
+        return textAreaCopy(text);
+    } else {
+        /* eslint-disable-next-line compat/compat */
+        return navigator.clipboard.writeText(text).catch(() => {
+            return textAreaCopy(text);
+        });
+    }
+}