feat: accept files and folders when uploading books
The picker could only choose folders: webkitdirectory switches the OS dialog into folder mode rather than filtering, so one input cannot offer both. Adds a drop zone with two browse buttons behind two inputs. Dropping a folder never worked either — dataTransfer.files does not descend into directories, so it arrived as one typeless entry and was rejected. Walks dataTransfer.items instead. Also collects skipped files into one expandable line rather than a toast each, which a folder of covers and notes made unusable, and shows the file count and total size before uploading.
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@@ -0,0 +1,223 @@
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<script lang="ts">
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import { FileUp, Folder, FileText } from '@lucide/svelte';
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import { Button } from '$lib/components/ui/button/index.js';
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import type { FileRejectedReason } from '$lib/components/ui/file-drop-zone';
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import { cn } from '$lib/utils';
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let {
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onUpload,
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onFileRejected,
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accept,
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maxFileSize,
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disabled = false,
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class: className
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}: {
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onUpload: (files: File[]) => Promise<void> | void;
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onFileRejected?: (opts: { reason: FileRejectedReason; file: File }) => void;
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/** Comma separated extensions and/or MIME types, as the `accept` attribute takes. */
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accept?: string;
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/** Bytes. */
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maxFileSize?: number;
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disabled?: boolean;
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class?: string;
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} = $props();
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/**
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* Two inputs rather than one.
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*
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* `webkitdirectory` is not a filter — it switches the picker into folder mode,
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* so a single input can offer files or folders but never both. The drop target
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* has no such constraint and stays one area.
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*/
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let fileInput = $state<HTMLInputElement>();
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let folderInput = $state<HTMLInputElement>();
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let dragging = $state(false);
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let busy = $state(false);
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const active = $derived(!disabled && !busy);
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function accepts(file: File): FileRejectedReason | undefined {
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if (maxFileSize !== undefined && file.size > maxFileSize) return 'Maximum file size exceeded';
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if (!accept) return undefined;
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const name = file.name.toLowerCase();
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const type = file.type.toLowerCase();
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const ok = accept
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.split(',')
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.map((pattern) => pattern.trim().toLowerCase())
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.some((pattern) => {
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// Match on the pattern, not the file's type. Testing `type` here is
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// what makes MOBI fail: browsers report no MIME type for it, so a
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// ".mobi" rule never gets compared against the filename.
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if (pattern.startsWith('.')) return name.endsWith(pattern);
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if (pattern.endsWith('/*')) return type.startsWith(pattern.slice(0, -1));
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return type === pattern;
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});
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return ok ? undefined : 'File type not allowed';
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}
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/** readEntries hands back at most 100 at a time and signals the end with an empty batch. */
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function readAll(reader: FileSystemDirectoryReader): Promise<FileSystemEntry[]> {
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return new Promise((resolve, reject) => {
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const entries: FileSystemEntry[] = [];
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const next = () =>
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reader.readEntries((batch) => {
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if (batch.length === 0) return resolve(entries);
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entries.push(...batch);
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next();
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}, reject);
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next();
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});
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}
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/**
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* Flattens a dropped entry into files, naming each one with its path inside the
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* dropped folder so it matches what the folder picker puts in
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* `webkitRelativePath` — which is what the upload form reads to keep structure.
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*/
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async function walk(entry: FileSystemEntry, prefix = ''): Promise<File[]> {
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if (entry.isFile) {
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const file = await new Promise<File>((resolve, reject) =>
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(entry as FileSystemFileEntry).file(resolve, reject)
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);
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return [new File([file], `${prefix}${file.name}`, { type: file.type })];
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}
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if (entry.isDirectory) {
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const entries = await readAll((entry as FileSystemDirectoryEntry).createReader());
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const nested = await Promise.all(entries.map((e) => walk(e, `${prefix}${entry.name}/`)));
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return nested.flat();
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}
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return [];
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}
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async function handleDrop(event: DragEvent) {
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event.preventDefault();
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dragging = false;
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if (!active) return;
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// Read the entries synchronously: DataTransfer is emptied as soon as this
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// handler yields, so awaiting first loses everything that was dropped.
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const entries = Array.from(event.dataTransfer?.items ?? [])
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.filter((item) => item.kind === 'file')
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.map((item) => item.webkitGetAsEntry())
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.filter((entry): entry is FileSystemEntry => entry !== null);
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// Older engines expose no entries; fall back to the flat list, which cannot
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// contain folders anyway.
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if (entries.length === 0) {
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await submit(Array.from(event.dataTransfer?.files ?? []));
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return;
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}
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busy = true;
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try {
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const nested = await Promise.all(entries.map((entry) => walk(entry)));
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await submit(nested.flat());
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} finally {
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busy = false;
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}
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}
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async function handleChange(event: Event) {
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const input = event.currentTarget as HTMLInputElement;
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const chosen = Array.from(input.files ?? []);
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// Reset first so picking the same file twice still fires a change event.
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input.value = '';
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await submit(chosen);
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}
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async function submit(candidates: File[]) {
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const accepted: File[] = [];
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for (const file of candidates) {
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const reason = accepts(file);
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if (reason) onFileRejected?.({ file, reason });
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else accepted.push(file);
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}
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if (accepted.length > 0) await onUpload(accepted);
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}
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</script>
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<div
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role="group"
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aria-label="Add books"
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aria-disabled={!active}
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ondragover={(e) => {
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e.preventDefault();
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if (active) dragging = true;
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}}
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ondragleave={() => (dragging = false)}
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ondrop={handleDrop}
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class={cn(
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'flex flex-col items-center gap-3 rounded-lg border-2 border-dashed border-border bg-accent/20 p-6 text-center transition-colors',
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dragging && 'border-primary bg-accent/50',
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!active && 'opacity-50',
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className
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)}
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>
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<div
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class="flex size-12 place-items-center justify-center rounded-full border border-dashed border-border text-muted-foreground"
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>
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<FileUp class="size-5" />
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</div>
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<div class="flex flex-col gap-0.5">
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<span class="font-medium">
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{busy ? 'Reading folder…' : 'Drop books here'}
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</span>
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<span class="text-sm text-muted-foreground">A folder keeps its structure</span>
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</div>
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<span class="font-mono text-[10px] tracking-widest text-muted-foreground uppercase">or</span>
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<div class="flex flex-wrap justify-center gap-2">
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<Button
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type="button"
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variant="outline"
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size="sm"
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disabled={!active}
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onclick={() => fileInput?.click()}
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>
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<FileText class="size-4" />
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Choose files
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</Button>
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<Button
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type="button"
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variant="outline"
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size="sm"
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disabled={!active}
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onclick={() => folderInput?.click()}
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>
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<Folder class="size-4" />
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Choose folder
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</Button>
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</div>
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<input
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bind:this={fileInput}
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type="file"
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multiple
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{accept}
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class="hidden"
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onchange={handleChange}
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/>
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<!-- webkitdirectory is why this needs to be a second input: it turns the
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picker into a folder chooser rather than filtering what it accepts. -->
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<input
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bind:this={folderInput}
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type="file"
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multiple
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webkitdirectory
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class="hidden"
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onchange={handleChange}
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/>
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</div>
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