1 files changed, 91 insertions, 0 deletions
diff --git a/web/source/settings/lib/form/file.jsx b/web/source/settings/lib/form/file.jsx
new file mode 100644
index 000000000..85f23e274
--- /dev/null
+++ b/web/source/settings/lib/form/file.jsx
@@ -0,0 +1,91 @@
+/*
+	GoToSocial
+	Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+"use strict";
+
+const React = require("react");
+const prettierBytes = require("prettier-bytes");
+
+module.exports = function useFileInput({ name, _Name }, {
+	withPreview,
+	maxSize,
+	initialInfo = "no file selected"
+} = {}) {
+	const [file, setFile] = React.useState();
+	const [imageURL, setImageURL] = React.useState();
+	const [info, setInfo] = React.useState();
+
+	function onChange(e) {
+		let file = e.target.files[0];
+		setFile(file);
+
+		URL.revokeObjectURL(imageURL);
+
+		if (file != undefined) {
+			if (withPreview) {
+				setImageURL(URL.createObjectURL(file));
+			}
+
+			let size = prettierBytes(file.size);
+			if (maxSize && file.size > maxSize) {
+				size = <span className="error-text">{size}</span>;
+			}
+
+			setInfo(<>
+				{file.name} ({size})
+			</>);
+		} else {
+			setInfo();
+		}
+	}
+
+	function reset() {
+		URL.revokeObjectURL(imageURL);
+		setImageURL();
+		setFile();
+		setInfo();
+	}
+
+	const infoComponent = (
+		<span className="form-info">
+			{info
+				? info
+				: initialInfo
+			}
+		</span>
+	);
+
+	// Array / Object hybrid, for easier access in different contexts
+	return Object.assign([
+		onChange,
+		reset,
+		{
+			[name]: file,
+			[`${name}URL`]: imageURL,
+			[`${name}Info`]: infoComponent,
+		}
+	], {
+		onChange,
+		reset,
+		name,
+		value: file,
+		previewValue: imageURL,
+		hasChanged: () => file != undefined,
+		infoComponent
+	});
+};
+\ No newline at end of file