초기 커밋: DefVideo 소스 등록

abcVideo 플레이어 소스 (client / server / shared / pythonsource / docs / .claude).
.gitignore 적용으로 node_modules·storage·samplevideo·미디어 등 대용량 일괄 제외.
103 files, ~964K.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/src/services/streaming.ts

@@ -0,0 +1,78 @@
+import fs from 'fs';
+import { promises as fsp } from 'fs';
+import path from 'path';
+import { pipeline } from 'stream/promises';
+import { Request, Response } from 'express';
+import { config } from '../config';
+
+const CHUNK_SIZE = 10 * 1024 * 1024; // 10MB
+
+export function resolveVideoPath(videoId: string): string {
+  const filePath = path.resolve(config.videosDir, videoId);
+  // Path traversal guard
+  if (!filePath.startsWith(path.resolve(config.videosDir))) {
+    throw new Error('Invalid video path');
+  }
+  return filePath;
+}
+
+export async function streamVideo(req: Request, res: Response): Promise<void> {
+  const { videoId } = req.params;
+
+  let filePath: string;
+  try {
+    filePath = resolveVideoPath(videoId);
+  } catch {
+    res.status(400).json({ error: 'Invalid video ID' });
+    return;
+  }
+
+  let stat: fs.Stats;
+  try {
+    stat = await fsp.stat(filePath);
+  } catch {
+    res.status(404).json({ error: 'Video not found' });
+    return;
+  }
+
+  const fileSize = stat.size;
+  const rangeHeader = req.headers.range;
+
+  if (!rangeHeader) {
+    res.writeHead(200, {
+      'Content-Type': 'video/mp4',
+      'Content-Length': fileSize,
+      'Accept-Ranges': 'bytes',
+    });
+    const stream = fs.createReadStream(filePath, { highWaterMark: 1024 * 1024 });
+    await pipeline(stream, res);
+    return;
+  }
+
+  const [startStr, endStr] = rangeHeader.replace(/bytes=/, '').split('-');
+  const start = parseInt(startStr, 10);
+  const end = Math.min(
+    endStr ? parseInt(endStr, 10) : start + CHUNK_SIZE - 1,
+    fileSize - 1
+  );
+
+  if (start > end || start >= fileSize) {
+    res.writeHead(416, { 'Content-Range': `bytes */${fileSize}` });
+    res.end();
+    return;
+  }
+
+  res.writeHead(206, {
+    'Content-Range': `bytes ${start}-${end}/${fileSize}`,
+    'Accept-Ranges': 'bytes',
+    'Content-Length': end - start + 1,
+    'Content-Type': 'video/mp4',
+  });
+
+  const stream = fs.createReadStream(filePath, {
+    start,
+    end,
+    highWaterMark: 1024 * 1024,
+  });
+  await pipeline(stream, res);
+}