first commit

backend/app/validators/video_url_validator.py

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+from pydantic import AnyUrl, validator, BaseModel
+import re
+
+SUPPORTED_PLATFORMS = {
+    "bilibili": r"(https?://)?(www\.)?bilibili\.com/video/[a-zA-Z0-9]+",
+    "youtube": r"(https?://)?(www\.)?(youtube\.com/watch\?v=|youtu\.be/)[\w\-]+",
+    "douyin": r"(https?://)?(www\.)?douyin\.com/video/\d+",
+}
+
+
+
+def is_supported_video_url(url: str) -> bool:
+    return any(re.match(pattern, url) for pattern in SUPPORTED_PLATFORMS.values())
+
+
+class VideoRequest(BaseModel):
+    url: AnyUrl
+    platform: str
+
+    @validator("url")
+    def validate_video_url(cls, v):
+        if not is_supported_video_url(str(v)):
+            raise ValueError("暂不支持该视频平台或链接格式无效")
+        return v