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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
booleanAttribute,
ChangeDetectionStrategy,
Component,
computed,
ElementRef,
inject,
input,
LOCALE_ID,
output,
viewChild
} from '@angular/core';
import { addIcons, elementUpload, SiIconComponent } from '@siemens/element-ng/icon';
import { SiTranslatePipe, t } from '@siemens/element-translate-ng/translate';
import { UploadFile } from './si-file-uploader.model';
@Component({
selector: 'si-file-dropzone',
imports: [SiIconComponent, SiTranslatePipe],
templateUrl: './si-file-dropzone.component.html',
styleUrl: './si-file-dropzone.component.scss',
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiFileDropzoneComponent {
/**
* Text or translation key of the input file selector (is combined with the `uploadTextRest`).
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_FILE_UPLOADER.FILE_SELECT:click to upload`)
* ```
*/
readonly uploadTextFileSelect = input(
t(() => $localize`:@@SI_FILE_UPLOADER.FILE_SELECT:click to upload`)
);
/**
* Text or translation key of the drag&drop field (is combined with the `uploadTextFileSelect`).
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_FILE_UPLOADER.DROP:Drop files here or`)
* ```
*/
readonly uploadDropText = input(t(() => $localize`:@@SI_FILE_UPLOADER.DROP:Drop files here or`));
/**
* Text or translation key for max file size.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_FILE_UPLOADER.MAX_SIZE:Maximum upload size`)
* ```
*/
readonly maxFileSizeText = input(
t(() => $localize`:@@SI_FILE_UPLOADER.MAX_SIZE:Maximum upload size`)
);
/**
* Text or translation key for accepted types.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_FILE_UPLOADER.ACCEPTED_FILE_TYPES:Accepted file types`)
* ```
*/
readonly acceptText = input(
t(() => $localize`:@@SI_FILE_UPLOADER.ACCEPTED_FILE_TYPES:Accepted file types`)
);
/**
* Text or translation key of message title if incorrect file type is dragged / dropped.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_FILE_UPLOADER.ERROR_FILE_TYPE:Incorrect file type selected`)
* ```
*/
readonly errorTextFileType = input(
t(() => $localize`:@@SI_FILE_UPLOADER.ERROR_FILE_TYPE:Incorrect file type selected`)
);
/**
* Message or translation key if file exceeds the maximum file size limit.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_FILE_UPLOADER.ERROR_FILE_SIZE_EXCEEDED:File exceeds allowed maximum size`)
* ```
*/
readonly errorTextFileMaxSize = input(
t(
() =>
$localize`:@@SI_FILE_UPLOADER.ERROR_FILE_SIZE_EXCEEDED:File exceeds allowed maximum size`
)
);
/**
* Define which file types are suggested in file browser.
* @see https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#attr-accept
*/
readonly accept = input<string>();
/**
* Define maximal allowed file size in bytes.
*/
readonly maxFileSize = input<number>();
/**
* Defines whether the file input allows selecting multiple files.
* When {@link directoryUpload} is enabled, this will have no effect.
*
* @defaultValue false
*/
readonly multiple = input(false, { transform: booleanAttribute });
/**
* Event emitted when files are added.
*/
readonly filesAdded = output<UploadFile[]>();
/**
* Enable directory upload.
*
* @defaultValue false
*/
readonly directoryUpload = input(false, { transform: booleanAttribute });
protected readonly maxFileSizeString = computed(() => {
const maxFileSize = this.maxFileSize();
return maxFileSize ? this.fileSizeToString(maxFileSize) : '';
});
protected readonly icons = addIcons({ elementUpload });
protected dragOver = false;
private readonly fileInput = viewChild.required<ElementRef>('fileInput');
private locale = inject(LOCALE_ID).toString();
private numberFormat = new Intl.NumberFormat(this.locale, { maximumFractionDigits: 2 });
protected dropHandler(event: DragEvent): void {
event.preventDefault();
if (this.directoryUpload()) {
this.handleItems(event.dataTransfer!.items);
} else {
this.handleFiles(event.dataTransfer!.files);
}
this.dragOver = false;
}
protected dragOverHandler(event: DragEvent): void {
event.preventDefault();
event.stopPropagation();
this.dragOver = true;
}
protected inputEnterHandler(): void {
this.fileInput().nativeElement.click();
}
protected inputHandler(event: Event): void {
this.handleFiles((event.target as HTMLInputElement).files);
}
protected handleFiles(files: FileList | null): void {
Iif (!files?.length) {
return;
}
const newFiles: UploadFile[] = [];
// eslint-disable-next-line @typescript-eslint/prefer-for-of
for (let i = 0; i < files.length; i++) {
newFiles.push(this.makeUploadFile(files[i]));
}
newFiles.sort((a, b) => a.fileName.localeCompare(b.fileName));
this.filesAdded.emit(newFiles);
this.reset();
}
/**
* Reset all the files inside the native file input (and therefore the dropzone).
*/
reset(): void {
this.fileInput().nativeElement.value = '';
}
private makeUploadFile(file: File): UploadFile {
const uploadFile: UploadFile = {
fileName: file.name,
file,
size: this.fileSizeToString(file.size),
progress: 0,
status: 'added'
};
// use MIME type of file if set. Otherwise fall back to file name ending
const ext = '.' + uploadFile.file.name.split('.').pop();
if (!this.verifyFileType(uploadFile.file.type, ext)) {
uploadFile.status = 'invalid';
uploadFile.errorText = this.errorTextFileType();
} else if (!this.verifyFileSize(uploadFile.file.size)) {
uploadFile.status = 'invalid';
uploadFile.errorText = this.errorTextFileMaxSize();
}
return uploadFile;
}
private verifyFileSize(size: number): boolean {
const maxFileSize = this.maxFileSize();
return !maxFileSize || size <= maxFileSize;
}
private verifyFileType(fileType: string | undefined, ext: string | undefined): boolean {
const accept = this.accept();
if (!accept) {
return true;
}
Iif (fileType === undefined && ext === undefined) {
return false;
}
// Spec says that comma is the delimiter for filetypes. Also allow pipe for compatibility
return accept.split(/,|\|/).some(acceptedType => {
// convert accept glob into regex (example: images/* --> images/.*)
const acceptedRegexStr = acceptedType.replace('.', '.').replace('*', '.*').trim();
const acceptedRegex = new RegExp(acceptedRegexStr, 'i');
// if fileType is set and accepted type looks like a MIME type, match that otherwise extension
if (fileType && acceptedType.includes('/')) {
return !!fileType.match(acceptedRegex);
}
return !!ext?.match(acceptedRegex);
});
}
private fileSizeToString(num: number): string {
let suffix = 'B';
if (num >= 1_073_741_824) {
num /= 1_073_741_824;
suffix = 'GB';
}
if (num >= 1_048_576) {
num /= 1_048_576;
suffix = 'MB';
} else if (num >= 1_024) {
num /= 1_024;
suffix = 'KB';
}
return this.numberFormat.format(num) + suffix;
}
private handleItems(items: DataTransferItemList): void {
const newFiles: UploadFile[] = [];
let pendingEntries = 0;
const traverseFileTree = (item: FileSystemEntry): void => {
if (item.isFile) {
(item as FileSystemFileEntry).file(file => {
newFiles.push(this.makeUploadFile(file));
if (--pendingEntries === 0) {
this.filesAdded.emit(newFiles);
this.reset();
}
});
} else if (item.isDirectory) {
const dirReader = (item as FileSystemDirectoryEntry).createReader();
dirReader.readEntries(entries => {
for (const entry of entries) {
pendingEntries++;
traverseFileTree(entry);
}
if (--pendingEntries === 0) {
this.filesAdded.emit(newFiles);
this.reset();
}
});
}
};
// items is not an array but of type DataTransferItemList
// eslint-disable-next-line @typescript-eslint/prefer-for-of
for (let i = 0; i < items.length; i++) {
const item = items[i].webkitGetAsEntry();
if (item) {
pendingEntries++;
traverseFileTree(item);
}
}
}
}
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