refactor(frontend): extract types, API, helpers, and preview from +page.svelte

frontend/src/lib/api.ts

@@ -0,0 +1,74 @@
+import type { FileRecord } from "$lib/types";
+
+export async function loadFiles(): Promise<FileRecord[]> {
+    const res = await fetch('/api/files', {
+        credentials: 'include'
+    });
+    
+    if (res.status === 401) {
+        window.location.href = '/auth';
+        return [];
+    }
+
+    if (!res.ok) {
+        throw new Error(`Failed to load files: ${res.status}`);
+    }
+
+    return await res.json()
+}
+
+
+export async function uploadFile(file: File): Promise<FileRecord> {
+    const formData = new FormData();
+    formData.append('file', file);
+    const res = await fetch('/api/files', {
+        method: 'POST',
+        credentials: 'include',
+        body: formData
+    });
+
+    if (!res.ok) {
+        throw new Error(`Upload failed: ${res.status}`)
+    }
+
+    return await res.json()
+}
+
+export async function downloadFile(fileId: number): Promise<Blob> {
+    const res = await fetch(`/api/files/${fileId}/download`, {
+        credentials: 'include'
+    });
+    if (!res.ok) {
+        throw new Error(`Download failed: ${res.status}`)
+    }
+
+    return await res.blob()
+}
+
+export async function deleteFile(fileId: number): Promise<void> {
+    const res = await fetch(`/api/files/${fileId}`, {
+        method: 'DELETE',
+        credentials: 'include'
+    });
+    if (!res.ok) {
+        throw new Error(`Delete failed: ${res.status}`);
+    }
+}
+
+export async function submit(activeTab: string, username: string, password: string): Promise<void> {
+    const endpoint = activeTab === 'login' ? '/api/auth/login' : '/api/auth/register';
+    const res = await fetch(`${endpoint}`, {
+        method: 'POST',
+        credentials: 'include',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ username, password })
+    });
+
+    if (!res.ok) {
+        throw new Error('Invalid credentials');
+    }
+}
+
+export async function logout(): Promise<void> {
+    await fetch('/api/auth/logout', { method: 'POST', credentials: 'include' });
+}

frontend/src/lib/components/FilePreview.svelte

@@ -0,0 +1,34 @@
+<script lang="ts">
+    import type { FileRecord } from "$lib/types";
+    import { fade } from "svelte/transition";
+
+    let { file, onclose }: { file: FileRecord; onclose: () => void } = $props();
+</script>
+
+<svelte:window onkeydown={(e) => { if (e.key === 'Escape') onclose(); }} />
+
+<!-- svelte-ignore a11y_click_events_have_key_events -->
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div
+    class="fixed inset-0 bg-black/60 flex items-center justify-center z-50"
+    onclick={onclose}
+    transition:fade={{ duration: 150 }}
+>
+    <div
+        class="bg-[#0f1117] border border-sky-200/20 rounded-sm w-2/3 h-2/3 flex flex-col p-6"
+        onclick={(e) => e.stopPropagation()}
+    >
+        <div class="flex items-center justify-between mb-4">
+            <span class="text-white text-sm font-medium">{file.name}</span>
+            <button class="text-white/40 hover:text-white transition-colors cursor-pointer" onclick={onclose} aria-label="Close">
+                <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <line x1="18" y1="6" x2="6" y2="18"/>
+                    <line x1="6" y1="6" x2="18" y2="18"/>
+                </svg>
+            </button>
+        </div>
+        <div class="flex-1 flex items-center justify-center text-white/20 text-sm">
+            preview coming soon
+        </div>
+    </div>
+</div>

frontend/src/lib/components/FileRow.svelte

@@ -0,0 +1,91 @@
+<script lang="ts">
+    import type { FileRecord } from '$lib/types';
+    import { formatName, formatSize } from '$lib/format';
+
+    let {
+        file,
+        selected,
+        onselect,
+        onpreview,
+        ondownload,
+        ondelete,
+    }: {
+        file: FileRecord;
+        selected: boolean;
+        onselect: () => void;
+        onpreview: () => void;
+        ondownload: () => void;
+        ondelete: () => void;
+    } = $props();
+
+    let confirming = $state(false);
+</script>
+
+<div
+    role="button"
+    tabindex="0"
+    onkeydown={(e) => {
+        if (e.key === 'Enter') {
+            onpreview();
+        } else if (e.key === ' ') {
+            e.preventDefault(); onselect();
+        }
+      }
+    }
+    onclick={onselect}
+    ondblclick={onpreview}
+    class="flex items-stretch border-l hover:bg-white/2 transition-all {selected ? 'border-sky-400/50 bg-white/2 ring-1 ring-inset ring-sky-400/50' : 'border-sky-200/20 border-l-transparent hover:border-l-sky-400/50'}"
+>
+    <span class="font-medium text-white text-sm flex-1 truncate py-2 pl-6">{formatName(file.name)}</span>
+    <span class="text-sm text-white/40 w-40 py-2">{formatSize(file.size)}</span>
+    <span class="text-sm text-white/40 w-48 py-2">{new Date(file.uploadedAt).toLocaleString()}</span>
+    <div class="w-px bg-sky-200/20 self-stretch"></div>
+    <div class="flex items-center gap-4 w-32 justify-center relative">
+        <!-- Download -->
+        <button class="text-white/40 hover:text-emerald-400 hover:scale-110 transition-all cursor-pointer" title="Download" onclick={ondownload}>
+            <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/>
+                <polyline points="7 10 12 15 17 10"/>
+                <line x1="12" y1="15" x2="12" y2="3"/>
+            </svg>
+        </button>
+        <!-- TODO: Copy -->
+        <button class="text-white/40 hover:text-blue-400 hover:scale-110 transition-all cursor-pointer" title="Copy link">
+            <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/>
+                <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/>
+            </svg>
+        </button>
+        <!-- Delete -->
+        <div class="relative">
+            <button class="text-white/40 hover:text-red-400 hover:scale-110 transition-all cursor-pointer" title="Delete" onclick={() => confirming = true}>
+                <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <polyline points="3 6 5 6 21 6"/>
+                    <path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6"/>
+                    <path d="M10 11v6"/>
+                    <path d="M14 11v6"/>
+                    <path d="M9 6V4a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v2"/>
+                </svg>
+            </button>
+            {#if confirming}
+                <div class="absolute left-6 top-1/2 -translate-y-1/2 flex items-center z-10">
+                    <div class="w-0 h-0 border-t-4 border-b-4 border-r-4 border-t-transparent border-b-transparent border-r-sky-200/20"></div>
+                    <div class="bg-[#0f1117] border border-sky-200/20 rounded px-3 py-2 flex items-center gap-2 whitespace-nowrap">
+                        <span class="text-white/40 text-xs">Confirm action</span>
+                        <button class="text-white/60 hover:text-white transition-colors cursor-pointer" title="Confirm" onclick={() => { ondelete(); confirming = false; }}>
+                            <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+                                <polyline points="20 6 9 17 4 12"/>
+                            </svg>
+                        </button>
+                        <button class="text-white/60 hover:text-white transition-colors cursor-pointer" title="Cancel" onclick={() => confirming = false}>
+                            <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+                                <line x1="18" y1="6" x2="6" y2="18"/>
+                                <line x1="6" y1="6" x2="18" y2="18"/>
+                            </svg>
+                        </button>
+                    </div>
+                </div>
+            {/if}
+        </div>
+    </div>
+</div>

frontend/src/lib/format.ts

@@ -0,0 +1,13 @@
+export function formatName(name: string): string {
+        if (name.length > 65) {
+            name = name.slice(0, 65).concat("...");
+        }
+        return name;
+	}
+
+export function formatSize(bytes: number): string {
+    if (bytes < 1000) return bytes + 'B';
+    if (bytes < 1000 * 1000) return (bytes / 1000).toFixed(1) + 'KB';
+    if (bytes < 1000 * 1000 * 1000) return (bytes / 1000 / 1000).toFixed(1) + 'MB';
+    return (bytes / 1000 / 1000 / 1000).toFixed(1) + 'GB';
+}

frontend/src/lib/types.ts

@@ -0,0 +1,6 @@
+export type FileRecord = {
+    id: number;
+    name: string;
+    size: number;
+    uploadedAt: string;
+};

frontend/src/routes/+page.svelte

@@ -2,69 +2,40 @@
     import { onMount } from 'svelte';
     import { fade } from 'svelte/transition';
     import { flip } from 'svelte/animate'
-
-    type FileRecord = {
-        id: number;
-        name: string;
-        size: number;
-        uploadedAt: string;
-    };
+	import type { FileRecord } from '$lib/types';
+	import { deleteFile, downloadFile, loadFiles, logout, uploadFile } from '$lib/api';
+	import FileRow from '$lib/components/FileRow.svelte';
+	import FilePreview from '$lib/components/FilePreview.svelte';
 
     let fileRecords = $state<FileRecord[]>([]);
-    let confirmDeleteId = $state<number | null>(null);
     let selectedFileId = $state<number | null>(null);
     let previewFile = $state<FileRecord | null>(null);
     let search = $state('');
     let loading = $state(true);
     
+    async function refresh() {
+      fileRecords = await loadFiles();
+      loading = false;
+    }
+
     let filteredFileRecords = $derived(fileRecords.filter(f =>
         f.name.toLowerCase().includes(search.toLowerCase())
     ));
 
     let fileInput: HTMLInputElement;
 
-    function openFilePicker() {
-        fileInput.click();
-    }
-
-    async function loadFiles() {
-        const res = await fetch('http://localhost:3000/api/files', {
-            credentials: 'include'
-        });
-        
-        if (res.status === 401) {
-			window.location.href = '/auth';
-            return;
-        }
-
-        fileRecords = await res.json();
-        loading = false;
-    }
-
-    onMount(loadFiles);
-
-    async function uploadFile(event: Event) {
+    async function handleUpload(event: Event) {
         const input = event.target as HTMLInputElement;
         const file = input.files?.[0];
-
         if (!file) return;
         
-        const formData = new FormData();
-        formData.append('file', file);
-        await fetch('http://localhost:3000/api/files', {
-            method: 'POST',
-            credentials: 'include',
-            body: formData
-        });
+        await uploadFile(file)
         input.value = '';
-        await loadFiles();
+        await refresh()
     }
     
-    async function downloadFile(fileId: number, fileName: string) {
-        const res = await fetch(`http://localhost:3000/api/files/${fileId}/download`, {
-            credentials: 'include'
-        });
-        const blob = await res.blob();
+    async function handleDownload(fileId: number, fileName: string) {
+        const blob = await downloadFile(fileId);
         const url = URL.createObjectURL(blob);
         const a = document.createElement('a');
         a.href = url;
@@ -73,40 +44,17 @@
         URL.revokeObjectURL(url);
     }
 
-    async function copyLink() {
-        await loadFiles();
-        //TODO: Generate sharable link with expiration date, add param fileId: number
-    }
-
-    async function deleteFile(fileId: number) {
-        await fetch(`http://localhost:3000/api/files/${fileId}`, {
-            method: 'DELETE',
-            credentials: 'include'
-        });
-        await loadFiles();
-    }
-
-	function formatName(name: string): string {
-        if (name.length > 65) {
-            name = name.slice(0, 65).concat("...");
-        }
-        return name;
-	}
-
-	function formatSize(bytes: number): string {
-        if (bytes < 1000) return bytes + 'B';
-        if (bytes < 1000 * 1000) return (bytes / 1000).toFixed(1) + 'KB';
-        if (bytes < 1000 * 1000 * 1000) return (bytes / 1000 / 1000).toFixed(1) + 'MB';
-        return (bytes / 1000 / 1000 / 1000).toFixed(1) + 'GB';
+    async function handleDelete(fileId: number) {
+        await deleteFile(fileId);
+        await refresh();
     }
     
     async function handleLogout() {
-        await fetch('http://localhost:3000/api/auth/logout', {
-            method: 'POST',
-            credentials: 'include',
-        });
+        await logout();
         window.location.href = '/auth';
     }
+
+    onMount(refresh)
 </script>
 
 <div class="w-full px-4 py-8">
@@ -133,9 +81,9 @@
         />
     </div>
 
-    <input type="file" bind:this={fileInput} onchange={uploadFile} class="hidden" />
+    <input type="file" bind:this={fileInput} onchange={handleUpload} class="hidden" />
     <div class="mb-1">
-        <button class="px-2 py-1 border border-sky-200/20 text-white/60 hover:border-sky-200/40 text-sm transition-colors rounded-sm cursor-pointer" onclick={openFilePicker}>
+        <button class="px-2 py-1 border border-sky-200/20 text-white/60 hover:border-sky-200/40 text-sm transition-colors rounded-sm cursor-pointer" onclick={() => fileInput.click()}>
             Import
         </button>
     </div>
@@ -151,96 +99,22 @@
         </div>
 
         {#each filteredFileRecords as fileRecord (fileRecord.id)}
-            <div
-                transition:fade={{ duration: 200 }}
-                animate:flip={{ duration: 200 }}
-                onclick={() => selectedFileId = fileRecord.id}
-                ondblclick={() => previewFile = fileRecord}
-                class="flex items-stretch border-l hover:bg-white/2 transition-all {selectedFileId === fileRecord.id ? 'border-sky-400/50 bg-white/2 ring-1 ring-inset ring-sky-400/50' : 'border-sky-200/20 border-l-transparent hover:border-l-sky-400/50'}"
-            >
-                <span class="font-medium text-white text-sm flex-1 truncate py-2 pl-6">{formatName(fileRecord.name)}</span>
-                <span class="text-sm text-white/40 w-40 py-2">{formatSize(fileRecord.size)}</span>
-                <span class="text-sm text-white/40 w-48 py-2">{new Date(fileRecord.uploadedAt).toLocaleString()}</span>
-                <div class="w-px bg-sky-200/20 self-stretch"></div>
-                <div class="flex items-center gap-4 w-32 justify-center relative">
-                    <!-- Download -->
-                    <button class="text-white/40 hover:text-emerald-400 hover:scale-110 transition-all cursor-pointer" title="Download" onclick={() => downloadFile(fileRecord.id, fileRecord.name)}>
-                        <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                            <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/>
-                            <polyline points="7 10 12 15 17 10"/>
-                            <line x1="12" y1="15" x2="12" y2="3"/>
-                        </svg>
-                    </button>
-                    <!-- TODO: Copy -->
-                    <button class="text-white/40 hover:text-blue-400 hover:scale-110 transition-all cursor-pointer" title="Copy link" onclick={() => copyLink()}>
-                        <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                            <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/>
-                            <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/>
-                        </svg>
-                    </button>
-                    <!-- Delete -->
-                    <div class="relative">
-                    <button class="text-white/40 hover:text-red-400 hover:scale-110 transition-all cursor-pointer" title="Delete" onclick={() => confirmDeleteId = fileRecord.id}>
-                        <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                            <polyline points="3 6 5 6 21 6"/>
-                            <path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6"/>
-                            <path d="M10 11v6"/>
-                            <path d="M14 11v6"/>
-                            <path d="M9 6V4a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v2"/>
-                        </svg>
-                    </button>
-                        {#if confirmDeleteId === fileRecord.id}
-                            <div class="absolute left-6 top-1/2 -translate-y-1/2 flex items-center z-10">
-                                <div class="w-0 h-0 border-t-4 border-b-4 border-r-4 border-t-transparent border-b-transparent border-r-sky-200/20"></div>
-                                <div class="bg-[#0f1117] border border-sky-200/20 rounded px-3 py-2 flex items-center gap-2 whitespace-nowrap">
-                                    <span class="text-white/40 text-xs">Confirm action</span>
-                                    <button class="text-white/60 hover:text-white transition-colors cursor-pointer" title="Confirm" onclick={() => { deleteFile(fileRecord.id); confirmDeleteId = null; }}>
-                                        <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
-                                            <polyline points="20 6 9 17 4 12"/>
-                                        </svg>
-                                    </button>
-                                    <button class="text-white/60 hover:text-white transition-colors cursor-pointer" title="Cancel" onclick={() => confirmDeleteId = null}>
-                                        <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
-                                            <line x1="18" y1="6" x2="6" y2="18"/>
-                                            <line x1="6" y1="6" x2="18" y2="18"/>
-                                        </svg>
-                                    </button>
-                                </div>
-                            </div>
-                        {/if}
-                    </div>
-                </div>
+            <div transition:fade={{ duration: 200 }} animate:flip={{ duration: 200 }}>
+            <FileRow
+                file={fileRecord}
+                selected={selectedFileId === fileRecord.id}
+                onselect={() => selectedFileId = fileRecord.id}
+                onpreview={() => previewFile = fileRecord}
+                ondownload={() => handleDownload(fileRecord.id, fileRecord.name)}
+                ondelete={() => handleDelete(fileRecord.id)}
+            />
             </div>
         {:else}
-            {#if !loading}
-                <p class="py-2 px-4 text-white/30 text-sm">No files yet.</p>
-            {/if}
+            {#if !loading}<p class="py-2 px-4 text-white/30 text-sm">No files yet.</p>{/if}
         {/each}
     </div>
 </div>
 
 {#if previewFile}
-    <div
-        class="fixed inset-0 bg-black/60 flex items-center justify-center z-50"
-        onclick={() => previewFile = null}
-        transition:fade={{ duration: 150 }}
-    >
-        <div
-            class="bg-[#0f1117] border border-sky-200/20 rounded-sm w-2/3 h-2/3 flex flex-col p-6"
-            onclick={(e) => e.stopPropagation()}
-        >
-            <div class="flex items-center justify-between mb-4">
-                <span class="text-white text-sm font-medium">{previewFile.name}</span>
-                <button class="text-white/40 hover:text-white transition-colors cursor-pointer" onclick={() => previewFile = null}>
-                    <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                        <line x1="18" y1="6" x2="6" y2="18"/>
-                        <line x1="6" y1="6" x2="18" y2="18"/>
-                    </svg>
-                </button>
-            </div>
-            <div class="flex-1 flex items-center justify-center text-white/20 text-sm">
-                preview coming soon
-            </div>
-        </div>
-    </div>
+    <FilePreview file={previewFile} onclose={() => previewFile = null} />
 {/if}

frontend/src/routes/auth/+page.svelte

@@ -1,26 +1,19 @@
 <script lang="ts">
+	import { submit } from "$lib/api";
+
     let activeTab = $state<'login' | 'register'>('login');
     let username = $state('');
     let password = $state('');
     let error = $state('');
 
     async function handleSubmit() {
-        const endpoint = activeTab === 'login' ? '/api/auth/login' : '/api/auth/register';
-        const res = await fetch(`http://localhost:3000${endpoint}`, {
-            method: 'POST',
-            credentials: 'include',
-            headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify({ username, password })
-        });
-
-        if (res.ok) {
+        try {
+            await submit(activeTab, username, password);
             window.location.href = '/';
-        } else {
+        } catch {
             error = 'Invalid credentials';
         }
     }
-
-
 </script>
 
 <div class="flex-1 flex items-center justify-center -mt-16">
@@ -50,7 +43,7 @@
                     bind:value={username}
                     type="text"
                     autocomplete="username"
-                    class="px-4 py-2 rounded-sm !bg-[#0f1117] border border-sky-200/15 transition-colors hover:bg-black/20 hover:border-sky-200/30 text-white/80 text-sm focus:outline-none focus:border-sky-200/40"
+                    class="px-4 py-2 rounded-sm bg-[#0f1117]! border border-sky-200/15 transition-colors hover:bg-black/20 hover:border-sky-200/30 text-white/80 text-sm focus:outline-none focus:border-sky-200/40"
                 />
             </div>
             <div class="flex flex-col gap-1">
@@ -60,7 +53,7 @@
                     bind:value={password}
                     type="password"
                     autocomplete="current-password"
-                    class="px-4 py-2 rounded-sm !bg-[#0f1117] border border-sky-200/15 transition-colors hover:bg-black/20 hover:border-sky-200/30 text-white/80 text-sm focus:outline-none focus:border-sky-200/40"
+                    class="px-4 py-2 rounded-sm bg-[#0f1117]! border border-sky-200/15 transition-colors hover:bg-black/20 hover:border-sky-200/30 text-white/80 text-sm focus:outline-none focus:border-sky-200/40"
                 />
             </div>
             {#if error}<p class="text-red-400/60 text-xs">{error}</p>{/if}

frontend/vite.config.ts

@@ -5,6 +5,11 @@ import { sveltekit } from '@sveltejs/kit/vite';
 
 export default defineConfig({
 	plugins: [tailwindcss(), sveltekit()],
+	server: {
+      proxy: {
+        '/api': 'http://localhost:3000'
+      }
+    },
 	test: {
 		expect: { requireAssertions: true },
 		projects: [