packages/extension-ui/src/components/InputFileWithLabel.tsx
// Copyright 2017-2024 @polkadot/extension-ui authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { DropzoneRef } from 'react-dropzone';
import React, { createRef, useCallback, useState } from 'react';
import Dropzone from 'react-dropzone';
import { formatNumber, hexToU8a, isHex, u8aToString } from '@polkadot/util';
import { useTranslation } from '../hooks/index.js';
import { styled } from '../styled.js';
import Label from './Label.js';
function classes (...classNames: (boolean | null | string | undefined)[]): string {
return classNames
.filter((className): boolean => !!className)
.join(' ');
}
export interface InputFileProps {
// Reference Example Usage: https://github.com/react-dropzone/react-dropzone/tree/master/examples/Accept
// i.e. MIME types: 'application/json, text/plain', or '.json, .txt'
className?: string;
accept?: string;
clearContent?: boolean;
convertHex?: boolean;
help?: React.ReactNode;
isDisabled?: boolean;
isError?: boolean;
label: string;
onChange?: (contents: Uint8Array, name: string) => void;
placeholder?: React.ReactNode | null;
withEllipsis?: boolean;
withLabel?: boolean;
}
interface FileState {
name: string;
size: number;
}
const BYTE_STR_0 = '0'.charCodeAt(0);
const BYTE_STR_X = 'x'.charCodeAt(0);
const NOOP = (): void => undefined;
function convertResult (result: ArrayBuffer, convertHex?: boolean): Uint8Array {
const data = new Uint8Array(result);
// this converts the input (if detected as hex), vai the hex conversion route
if (convertHex && data[0] === BYTE_STR_0 && data[1] === BYTE_STR_X) {
const hex = u8aToString(data);
if (isHex(hex)) {
return hexToU8a(hex);
}
}
return data;
}
function InputFile ({ accept, className = '', clearContent, convertHex, isDisabled, isError = false, label, onChange, placeholder }: InputFileProps): React.ReactElement<InputFileProps> {
const { t } = useTranslation();
const dropRef = createRef<DropzoneRef>();
const [file, setFile] = useState<FileState | undefined>();
const _onDrop = useCallback(
(files: File[]): void => {
files.forEach((file): void => {
const reader = new FileReader();
reader.onabort = NOOP;
reader.onerror = NOOP;
reader.onload = ({ target }: ProgressEvent<FileReader>): void => {
if (target?.result) {
const name = file.name;
const data = convertResult(target.result as ArrayBuffer, convertHex);
onChange && onChange(data, name);
dropRef && setFile({
name,
size: data.length
});
}
};
reader.readAsArrayBuffer(file);
});
},
[convertHex, dropRef, onChange]
);
const dropZone = (
<Dropzone
accept={accept}
disabled={isDisabled}
multiple={false}
onDrop={_onDrop}
ref={dropRef}
>
{({ getInputProps, getRootProps }): React.ReactElement => (
<div {...getRootProps({ className: classes('ui--InputFile', isError ? 'error' : '', className) })}>
<input {...getInputProps()} />
<em className='label'>
{
!file || clearContent
? placeholder || t('click to select or drag and drop the file here')
: placeholder || t('{{name}} ({{size}} bytes)', {
replace: {
name: file.name,
size: formatNumber(file.size)
}
})
}
</em>
</div>
)}
</Dropzone>
);
return label
? (
<Label
label={label}
>
{dropZone}
</Label>
)
: dropZone;
}
export default React.memo(styled(InputFile)<InputFileProps>(({ isError }) => `
border: 1px solid var(${isError ? '--errorBorderColor' : '--inputBorderColor'});
background: var(--inputBackground);
border-radius: var(--borderRadius);
color: var(${isError ? '--errorBorderColor' : '--textColor'});
font-size: 1rem;
margin: 0.25rem 0;
overflow-wrap: anywhere;
padding: 0.5rem 0.75rem;
&:hover {
cursor: pointer;
}
`));