frontend/package-lock.json

@@ -13,6 +13,7 @@
                 "@uswriting/exiftool": "1.0.9",
                 "axios": "^1.20.0",
                 "pinia": "^4.0.3",
+                "pretty-bytes": "^7.2.0",
                 "tailwindcss": "^4.3.3",
                 "vue": "^3.5.32",
                 "vue-router": "^4.6.4"
@@ -1924,6 +1925,18 @@
                 "node": "^10 || ^12 || >=14"
             }
         },
+        "node_modules/pretty-bytes": {
+            "version": "7.2.0",
+            "resolved": "https://registry.npmjs.org/pretty-bytes/-/pretty-bytes-7.2.0.tgz",
+            "integrity": "sha512-T2kroepGB5DRVbkN/nOpW03+VRWqdtJhZNuCW3wYk3chdPjgi4GcTBOaxWfHq1MIM0ypidxsSWbQaAiRpxnXmg==",
+            "license": "MIT",
+            "engines": {
+                "node": ">=20"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
+            }
+        },
         "node_modules/proxy-from-env": {
             "version": "2.1.0",
             "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-2.1.0.tgz",

frontend/package.json

@@ -14,6 +14,7 @@
         "@uswriting/exiftool": "1.0.9",
         "axios": "^1.20.0",
         "pinia": "^4.0.3",
+        "pretty-bytes": "^7.2.0",
         "tailwindcss": "^4.3.3",
         "vue": "^3.5.32",
         "vue-router": "^4.6.4"

frontend/src/components/upload/MetadataInspector.vue

@@ -0,0 +1,40 @@
+<template>
+    <section class="flex min-h-48 flex-col rounded-lg border border-border bg-card" aria-live="polite">
+        <header class="border-b border-border px-4 py-3">
+            <h2 class="text-sm font-medium text-card-foreground">Metadata</h2>
+            <p v-if="fileName" class="mt-0.5 truncate text-xs text-muted-foreground">{{ fileName }}</p>
+        </header>
+
+        <div class="flex flex-1 flex-col p-4">
+            <p v-if="!fileName" class="text-sm text-muted-foreground">Select an image to view its metadata.</p>
+
+            <p v-else-if="entry.status === 'error'" class="text-sm text-destructive">
+                {{ entry.message }}
+            </p>
+
+            <pre
+                v-else-if="entry.status === 'ready'"
+                class="max-h-96 flex-1 overflow-auto rounded-md bg-muted p-3 text-xs leading-relaxed whitespace-pre-wrap text-foreground"
+                >{{ entry.output }}</pre
+            >
+
+            <p v-else class="text-sm text-muted-foreground">{{ entry.message }}</p>
+        </div>
+    </section>
+</template>
+
+<script setup lang="ts">
+import type { PropType } from 'vue';
+import type { MetadataPreviewEntry } from '@/types/metadata/MetadataPreview';
+
+defineProps({
+    fileName: {
+        type: String as PropType<string | null>,
+        required: true
+    },
+    entry: {
+        type: Object as PropType<MetadataPreviewEntry>,
+        required: true
+    }
+});
+</script>

frontend/src/stores/metadata.ts

@@ -5,8 +5,20 @@ import type { MetadataPreviewEntry } from '@/types/metadata/MetadataPreview';
 
 const EXIFTOOL_PREPARE_ERROR_MESSAGE = 'Could not prepare ExifTool';
 const EXIFTOOL_INITIALIZING_MESSAGE = 'Initializing ExifTool';
-const METADATA_READING_MESSAGE = 'Reading metadata';
+const METADATA_LOADING_MESSAGE = 'Loading metadata';
-const METADATA_READ_ERROR_MESSAGE = 'Could not read image metadata';
+const METADATA_LOAD_ERROR_MESSAGE = 'Could not load image metadata';
+const METADATA_IDLE_MESSAGE = 'Waiting to load metadata';
+const METADATA_READY_MESSAGE = 'Metadata loaded';
+
+const METADATA_IDLE_PREVIEW: MetadataPreviewEntry = {
+    status: 'idle',
+    message: METADATA_IDLE_MESSAGE
+};
+
+const METADATA_LOADING_PREVIEW: MetadataPreviewEntry = {
+    status: 'loading',
+    message: METADATA_LOADING_MESSAGE
+};
 
 export const useMetadataStore = defineStore('metadata', () => {
     const previewsByKey = ref<Record<string, MetadataPreviewEntry>>({});
@@ -18,10 +30,14 @@ export const useMetadataStore = defineStore('metadata', () => {
 
     const makeKeyFromFile = (file: File): string => `${file.name}\0${file.size}\0${file.lastModified}`;
 
-    const getPreview = (file: File): MetadataPreviewEntry => {
+    const getPreview = (file?: File | null): MetadataPreviewEntry => {
+        if (!file) {
+            return METADATA_IDLE_PREVIEW;
+        }
+
         const key = makeKeyFromFile(file);
 
-        return previewsByKey.value[key] ?? { status: 'idle' };
+        return previewsByKey.value[key] ?? METADATA_IDLE_PREVIEW;
     };
 
     const loadPreview = async (file: File): Promise<MetadataPreviewEntry> => {
@@ -41,7 +57,7 @@ export const useMetadataStore = defineStore('metadata', () => {
         if (exiftoolInitStatus.value === 'ready') {
             previewsByKey.value = {
                 ...previewsByKey.value,
-                [key]: { status: 'loading', message: METADATA_READING_MESSAGE }
+                [key]: METADATA_LOADING_PREVIEW
             };
         } else {
             previewsByKey.value = {
@@ -54,7 +70,7 @@ export const useMetadataStore = defineStore('metadata', () => {
 
                 previewsByKey.value = {
                     ...previewsByKey.value,
-                    [key]: { status: 'loading', message: METADATA_READING_MESSAGE }
+                    [key]: METADATA_LOADING_PREVIEW
                 };
             } catch {
                 const entry: MetadataPreviewEntry = {
@@ -71,7 +87,11 @@ export const useMetadataStore = defineStore('metadata', () => {
         try {
             const output = await readMetadata(file);
 
-            const entry: MetadataPreviewEntry = { status: 'ready', output };
+            const entry: MetadataPreviewEntry = {
+                status: 'ready',
+                message: METADATA_READY_MESSAGE,
+                output
+            };
 
             previewsByKey.value = { ...previewsByKey.value, [key]: entry };
 
@@ -79,7 +99,7 @@ export const useMetadataStore = defineStore('metadata', () => {
         } catch {
             const entry: MetadataPreviewEntry = {
                 status: 'error',
-                message: METADATA_READ_ERROR_MESSAGE
+                message: METADATA_LOAD_ERROR_MESSAGE
             };
 
             previewsByKey.value = { ...previewsByKey.value, [key]: entry };
@@ -91,19 +111,6 @@ export const useMetadataStore = defineStore('metadata', () => {
     const loadPreviews = (files: readonly File[]): Promise<MetadataPreviewEntry[]> =>
         Promise.all(files.map(file => loadPreview(file)));
 
-    const clearPreview = (file: File): void => {
-        const key = makeKeyFromFile(file);
-
-        if (!(key in previewsByKey.value)) {
-            return;
-        }
-
-        const next = { ...previewsByKey.value };
-
-        delete next[key];
-        previewsByKey.value = next;
-    };
-
     const clearAllPreviews = (): void => {
         previewsByKey.value = {};
     };
@@ -114,7 +121,6 @@ export const useMetadataStore = defineStore('metadata', () => {
         getPreview,
         loadPreview,
         loadPreviews,
-        clearPreview,
         clearAllPreviews
     };
 });

frontend/src/types/metadata/MetadataPreview.ts

@@ -1,6 +1,6 @@
 export type MetadataPreviewEntry =
-    | { status: 'idle' }
+    | { status: 'idle'; message: string }
     | { status: 'pending'; message: string }
     | { status: 'loading'; message: string }
-    | { status: 'ready'; output: string }
+    | { status: 'ready'; message: string; output: string }
     | { status: 'error'; message: string };

frontend/src/types/upload/PickedUploadAnalysis.ts

@@ -0,0 +1,6 @@
+export type PickedUploadAnalysis = {
+    accepted: File[];
+    nonImageCount: number;
+    oversizedImagesCount: number;
+    queueOmittedImagesCount: number;
+};

frontend/src/views/UploadView.vue

@@ -1,19 +1,195 @@
 <template>
-    <main class="flex min-h-screen flex-col p-8">
+    <main class="mx-auto flex min-h-screen max-w-3xl flex-col gap-6 p-8">
+        <div>
             <h1 class="text-2xl font-semibold tracking-tight">Upload</h1>
-        <p class="mt-2 text-muted-foreground">Upload UI coming soon.</p>
+            <p class="mt-2 text-sm text-muted-foreground">
+                Choose up to {{ maxQueueSize }} images, up to
+                {{ maxImageSizeFormatted }}
+                each.
+            </p>
+        </div>
+
+        <div>
+            <label
+                class="inline-flex items-center justify-center rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground transition-colors hover:opacity-90"
+                :class="loadingMetadata ? 'cursor-not-allowed opacity-60' : 'cursor-pointer'"
+            >
+                Choose images
+                <input
+                    ref="fileInputRef"
+                    type="file"
+                    accept="image/*"
+                    multiple
+                    class="sr-only"
+                    :disabled="loadingMetadata"
+                    @change="onFileInputChange"
+                />
+            </label>
+
+            <p v-if="selectionError" class="mt-2 text-sm text-destructive">{{ selectionError }}</p>
+        </div>
+
+        <ul v-if="queueRows.length > 0" class="divide-y divide-border rounded-lg border border-border">
+            <li v-for="row in queueRows" :key="row.key">
+                <button
+                    type="button"
+                    class="flex w-full items-center gap-3 px-4 py-3 text-left transition-colors hover:bg-muted/60"
+                    :class="isFileSelected(row.file) ? 'bg-muted/80' : ''"
+                    @click="selectedFile = row.file"
+                >
+                    <span class="min-w-0 flex-1 truncate text-sm font-medium">{{ row.file.name }}</span>
+                    <span class="shrink-0 text-xs text-muted-foreground">
+                        {{ prettyBytes(row.file.size, { maximumFractionDigits: 1 }) }}
+                    </span>
+                    <span class="shrink-0 text-xs" :class="statusTextClass(row.preview)">
+                        {{ row.preview.message }}
+                    </span>
+                </button>
+            </li>
+        </ul>
+
+        <MetadataInspector :file-name="selectedFile?.name ?? null" :entry="selectedPreview" />
     </main>
 </template>
 
 <script setup lang="ts">
-import { onBeforeMount } from 'vue';
+import { computed, onBeforeMount, ref } from 'vue';
+import MetadataInspector from '@/components/upload/MetadataInspector.vue';
+import { config } from '@/config';
 import { useExiftoolStore } from '@/stores/exiftool';
+import { useMetadataStore } from '@/stores/metadata';
+import type { MetadataPreviewEntry } from '@/types/metadata/MetadataPreview';
+import type { PickedUploadAnalysis } from '@/types/upload/PickedUploadAnalysis';
+import prettyBytes from 'pretty-bytes';
+
+const { maxQueueSize, maxImageBytes } = config.validation.upload;
 
 const exiftoolStore = useExiftoolStore();
+const metadataStore = useMetadataStore();
 
 const { initializeExiftool } = exiftoolStore;
+const { makeKeyFromFile, getPreview, loadPreviews, clearAllPreviews } = metadataStore;
 
-onBeforeMount(() => {
+const queuedFiles = ref<File[]>([]);
-    initializeExiftool();
+const selectedFile = ref<File | null>(null);
+const selectionError = ref<string | null>(null);
+const loadingMetadata = ref(false);
+const fileInputRef = ref<HTMLInputElement | null>(null);
+
+onBeforeMount(async () => {
+    try {
+        await initializeExiftool();
+    } catch (error) {
+        console.error(error);
+    }
 });
+
+const maxImageSizeFormatted = computed(() => prettyBytes(maxImageBytes, { binary: true, maximumFractionDigits: 1 }));
+
+const queueRows = computed(() =>
+    queuedFiles.value.map(file => ({
+        file,
+        key: makeKeyFromFile(file),
+        preview: getPreview(file)
+    }))
+);
+
+const selectedPreview = computed(() => getPreview(selectedFile.value));
+
+const isFileSelected = (file: File): boolean =>
+    selectedFile.value !== null && makeKeyFromFile(selectedFile.value) === makeKeyFromFile(file);
+
+const statusTextClass = (entry: MetadataPreviewEntry): string =>
+    entry.status === 'error' ? 'text-destructive' : 'text-muted-foreground';
+
+const onFileInputChange = async (event: Event): Promise<void> => {
+    if (loadingMetadata.value) {
+        return;
+    }
+
+    const input = event.target as HTMLInputElement;
+    const picked = input.files ? [...input.files] : [];
+
+    resetUploadSelection();
+
+    if (picked.length === 0) {
+        return;
+    }
+
+    const { accepted, nonImageCount, oversizedImagesCount, queueOmittedImagesCount } = analyzePickedUploadFiles(picked);
+
+    if (nonImageCount === picked.length) {
+        selectionError.value = 'Only image files can be added.';
+
+        return;
+    }
+
+    if (accepted.length === 0) {
+        selectionError.value = `Each image must be at most ${maxImageSizeFormatted.value}.`;
+
+        return;
+    }
+
+    selectionError.value = buildPickedUploadWarning({ nonImageCount, oversizedImagesCount, queueOmittedImagesCount });
+
+    queuedFiles.value = accepted;
+    selectedFile.value = accepted[0] ?? null;
+
+    loadingMetadata.value = true;
+
+    try {
+        await loadPreviews(accepted);
+    } catch (error) {
+        console.error(error);
+    } finally {
+        loadingMetadata.value = false;
+    }
+};
+
+const resetUploadSelection = (): void => {
+    selectionError.value = null;
+    clearAllPreviews();
+    queuedFiles.value = [];
+    selectedFile.value = null;
+
+    if (fileInputRef.value) {
+        fileInputRef.value.value = '';
+    }
+};
+
+const analyzePickedUploadFiles = (picked: File[]): PickedUploadAnalysis => {
+    const images = picked.filter(file => file.type.startsWith('image/'));
+    const nonImageCount = picked.length - images.length;
+    const imagesWithinSizeLimit = images.filter(file => file.size <= maxImageBytes);
+    const oversizedImagesCount = images.length - imagesWithinSizeLimit.length;
+    const accepted = imagesWithinSizeLimit.slice(0, maxQueueSize);
+    const queueOmittedImagesCount = imagesWithinSizeLimit.length - accepted.length;
+
+    return {
+        accepted,
+        nonImageCount,
+        oversizedImagesCount,
+        queueOmittedImagesCount
+    };
+};
+
+const buildPickedUploadWarning = (
+    summary: Pick<PickedUploadAnalysis, 'nonImageCount' | 'oversizedImagesCount' | 'queueOmittedImagesCount'>
+): string | null => {
+    const parts: string[] = [];
+
+    if (summary.nonImageCount > 0) {
+        parts.push(`${summary.nonImageCount} non-image file(s) were skipped.`);
+    }
+
+    if (summary.oversizedImagesCount > 0) {
+        parts.push(`${summary.oversizedImagesCount} image(s) exceeded the size limit and were skipped.`);
+    }
+
+    if (summary.queueOmittedImagesCount > 0) {
+        parts.push(`Only the first ${maxQueueSize} valid images were added.`);
+    }
+
+    return parts.length > 0 ? parts.join(' ') : null;
+};
 </script>

frontend/src/workers/exiftoolWorker.ts

@@ -93,7 +93,7 @@ const processJob = async (job: ExiftoolWorkerJob): Promise<void> => {
         } catch (error) {
             self.postMessage({
                 type: 'init-error',
-                message: resolveErrorMessage(error, 'Failed to prepare ExifTool')
+                message: resolveErrorMessage(error, 'Could not prepare ExifTool')
             });
         }
 
@@ -117,7 +117,7 @@ const processJob = async (job: ExiftoolWorkerJob): Promise<void> => {
             self.postMessage({
                 type: 'read-metadata-error',
                 id: job.id,
-                message: resolveErrorMessage(error, 'Could not read image metadata')
+                message: resolveErrorMessage(error, 'Could not load image metadata')
             });
         }
     }