Add drag-and-drop upload component with chunked uploads and offline support

frontend/src/pages/PackagePage.css

@@ -127,6 +127,58 @@ h2 {
   font-size: 0.75rem;
 }
 
+/* Download by Artifact ID Section */
+.download-by-id-section {
+  margin-top: 32px;
+  background: var(--bg-secondary);
+}
+
+.download-by-id-section h3 {
+  margin-bottom: 12px;
+  color: var(--text-primary);
+  font-size: 1rem;
+  font-weight: 600;
+}
+
+.download-by-id-form {
+  display: flex;
+  gap: 12px;
+  align-items: center;
+}
+
+.artifact-id-input {
+  flex: 1;
+  padding: 10px 16px;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
+  font-size: 0.8125rem;
+  color: var(--text-primary);
+}
+
+.artifact-id-input::placeholder {
+  color: var(--text-muted);
+}
+
+.artifact-id-input:focus {
+  outline: none;
+  border-color: var(--accent-primary);
+}
+
+.btn-disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+  pointer-events: none;
+}
+
+.validation-hint {
+  margin-top: 8px;
+  margin-bottom: 0;
+  font-size: 0.75rem;
+  color: var(--warning-color, #f59e0b);
+}
+
 /* Usage Section */
 .usage-section {
   margin-top: 32px;

frontend/src/pages/PackagePage.tsx

@@ -1,7 +1,7 @@
-import { useState, useEffect, useRef, useCallback } from 'react';
+import { useState, useEffect, useCallback } from 'react';
 import { useParams, useSearchParams, useNavigate } from 'react-router-dom';
 import { TagDetail, Package, PaginatedResponse } from '../types';
-import { listTags, uploadArtifact, getDownloadUrl, getPackage } from '../api';
+import { listTags, getDownloadUrl, getPackage } from '../api';
 import { Breadcrumb } from '../components/Breadcrumb';
 import { Badge } from '../components/Badge';
 import { SearchInput } from '../components/SearchInput';
@@ -9,6 +9,7 @@ import { SortDropdown, SortOption } from '../components/SortDropdown';
 import { FilterChip, FilterChipGroup } from '../components/FilterChip';
 import { DataTable } from '../components/DataTable';
 import { Pagination } from '../components/Pagination';
+import { DragDropUpload, UploadResult } from '../components/DragDropUpload';
 import './Home.css';
 import './PackagePage.css';
 
@@ -61,10 +62,9 @@ function PackagePage() {
   const [tagsData, setTagsData] = useState<PaginatedResponse<TagDetail> | null>(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
-  const [uploading, setUploading] = useState(false);
-  const [uploadResult, setUploadResult] = useState<string | null>(null);
-  const [tag, setTag] = useState('');
-  const fileInputRef = useRef<HTMLInputElement>(null);
+  const [uploadTag, setUploadTag] = useState('');
+  const [uploadSuccess, setUploadSuccess] = useState<string | null>(null);
+  const [artifactIdInput, setArtifactIdInput] = useState('');
 
   // Get params from URL
   const page = parseInt(searchParams.get('page') || '1', 10);
@@ -122,30 +122,22 @@ function PackagePage() {
     return () => window.removeEventListener('keydown', handleKeyDown);
   }, [navigate, projectName]);
 
-  async function handleUpload(e: React.FormEvent) {
-    e.preventDefault();
-    const file = fileInputRef.current?.files?.[0];
-    if (!file) {
-      setError('Please select a file');
-      return;
-    }
+  const handleUploadComplete = useCallback((results: UploadResult[]) => {
+    const count = results.length;
+    const message = count === 1 
+      ? `Uploaded successfully! Artifact ID: ${results[0].artifact_id}`
+      : `${count} files uploaded successfully!`;
+    setUploadSuccess(message);
+    setUploadTag('');
+    loadData();
+    
+    // Auto-dismiss success message after 5 seconds
+    setTimeout(() => setUploadSuccess(null), 5000);
+  }, [loadData]);
 
-    try {
-      setUploading(true);
-      setError(null);
-      const result = await uploadArtifact(projectName!, packageName!, file, tag || undefined);
-      setUploadResult(`Uploaded successfully! Artifact ID: ${result.artifact_id}`);
-      setTag('');
-      if (fileInputRef.current) {
-        fileInputRef.current.value = '';
-      }
-      loadData();
-    } catch (err) {
-      setError(err instanceof Error ? err.message : 'Upload failed');
-    } finally {
-      setUploading(false);
-    }
-  }
+  const handleUploadError = useCallback((errorMsg: string) => {
+    setError(errorMsg);
+  }, []);
 
   const handleSearchChange = (value: string) => {
     updateParams({ search: value, page: '1' });
@@ -292,29 +284,29 @@ function PackagePage() {
       </div>
 
       {error && <div className="error-message">{error}</div>}
-      {uploadResult && <div className="success-message">{uploadResult}</div>}
+      {uploadSuccess && <div className="success-message">{uploadSuccess}</div>}
 
       <div className="upload-section card">
         <h3>Upload Artifact</h3>
-        <form onSubmit={handleUpload} className="upload-form">
+        <div className="upload-form">
           <div className="form-group">
-            <label htmlFor="file">File</label>
-            <input id="file" type="file" ref={fileInputRef} required />
-          </div>
-          <div className="form-group">
-            <label htmlFor="tag">Tag (optional)</label>
+            <label htmlFor="upload-tag">Tag (optional)</label>
             <input
-              id="tag"
+              id="upload-tag"
               type="text"
-              value={tag}
-              onChange={(e) => setTag(e.target.value)}
+              value={uploadTag}
+              onChange={(e) => setUploadTag(e.target.value)}
               placeholder="v1.0.0, latest, stable..."
             />
           </div>
-          <button type="submit" className="btn btn-primary" disabled={uploading}>
-            {uploading ? 'Uploading...' : 'Upload'}
-          </button>
-        </form>
+          <DragDropUpload
+            projectName={projectName!}
+            packageName={packageName!}
+            tag={uploadTag || undefined}
+            onUploadComplete={handleUploadComplete}
+            onUploadError={handleUploadError}
+          />
+        </div>
       </div>
 
       <div className="section-header">
@@ -367,6 +359,34 @@ function PackagePage() {
         />
       )}
 
+      <div className="download-by-id-section card">
+        <h3>Download by Artifact ID</h3>
+        <div className="download-by-id-form">
+          <input
+            type="text"
+            value={artifactIdInput}
+            onChange={(e) => setArtifactIdInput(e.target.value.toLowerCase().replace(/[^a-f0-9]/g, '').slice(0, 64))}
+            placeholder="Enter SHA256 artifact ID (64 hex characters)"
+            className="artifact-id-input"
+          />
+          <a
+            href={artifactIdInput.length === 64 ? getDownloadUrl(projectName!, packageName!, `artifact:${artifactIdInput}`) : '#'}
+            className={`btn btn-primary ${artifactIdInput.length !== 64 ? 'btn-disabled' : ''}`}
+            download
+            onClick={(e) => {
+              if (artifactIdInput.length !== 64) {
+                e.preventDefault();
+              }
+            }}
+          >
+            Download
+          </a>
+        </div>
+        {artifactIdInput.length > 0 && artifactIdInput.length !== 64 && (
+          <p className="validation-hint">Artifact ID must be exactly 64 hex characters ({artifactIdInput.length}/64)</p>
+        )}
+      </div>
+
       <div className="usage-section card">
         <h3>Usage</h3>
         <p>Download artifacts using:</p>