fix(RAG): fix url document rag mode (#2874)

examples/awel/simple_rag_summary_example.py

@@ -9,6 +9,7 @@ This example shows how to use AWEL to build a simple rag summary example.
         ```
             export OPENAI_API_KEY={your_openai_key}
             export OPENAI_API_BASE={your_openai_base}
+            export MODEL_NAME={LLM_MODEL_NAME}
         ```
         or
         ```
@@ -23,7 +24,7 @@ This example shows how to use AWEL to build a simple rag summary example.
 
         curl -X POST http://127.0.0.1:5555/api/v1/awel/trigger/examples/rag/summary \
         -H "Content-Type: application/json" -d '{
-            "url": "https://docs.dbgpt.site/docs/awel"
+            "url": "http://docs.dbgpt.cn/docs/awel/"
         }'
 """
 
@@ -58,13 +59,17 @@ with DAG("dbgpt_awel_simple_rag_summary_example") as dag:
         "/examples/rag/summary", methods="POST", request_body=TriggerReqBody
     )
     request_handle_task = RequestHandleOperator()
-    path_operator = MapOperator(lambda request: request["url"])
+    path_operator = MapOperator(lambda request: {"source": request["url"]})
     # build knowledge operator
     knowledge_operator = KnowledgeOperator(knowledge_type=KnowledgeType.URL.name)
     # build summary assembler operator
     summary_operator = SummaryAssemblerOperator(
-        llm_client=OpenAILLMClient(api_key=os.getenv("OPENAI_API_KEY", "your api key")),
-        language="en",
+        llm_client=OpenAILLMClient(
+            api_key=os.getenv("OPENAI_API_KEY", "your api key"),
+            api_base=os.getenv("OPENAI_API_BASE", "your api base"),
+        ),
+        language="zh",
+        model_name=os.getenv("MODEL_NAME", "your model name"),
     )
     (
         trigger

packages/dbgpt-ext/src/dbgpt_ext/rag/knowledge/url.py

@@ -37,16 +37,96 @@ class URLKnowledge(Knowledge):
         """Fetch URL document from loader."""
         if self._loader:
             documents = self._loader.load()
+            return [Document.langchain2doc(lc_document) for lc_document in documents]
         else:
-            from langchain.document_loaders import WebBaseLoader  # mypy: ignore
-
-            if self._path is not None:
-                web_reader = WebBaseLoader(web_path=self._path, encoding="utf8")
-                documents = web_reader.load()
-            else:
-                # Handle the case where self._path is None
+            if self._path is None:
                 raise ValueError("web_path cannot be None")
-        return [Document.langchain2doc(lc_document) for lc_document in documents]
+
+            return self._load_document_default()
+
+    def _load_document_default(self) -> List[Document]:
+        """Fetch URL document with trafilatura."""
+
+        import re
+        import unicodedata
+
+        import requests
+        from bs4 import BeautifulSoup
+
+        def clean_text(text: str) -> str:
+            """Clean text by removing special Unicode characters."""
+            if not text:
+                return ""
+
+            # Remove zero-width characters and other invisible Unicode characters
+            text = re.sub(r"[\u200b-\u200f\u2060\ufeff]", "", text)
+
+            # Remove control characters except newline, tab, and carriage return
+            text = re.sub(r"[\x00-\x08\x0b-\x0c\x0e-\x1f\x7f-\x9f]", "", text)
+
+            # Normalize Unicode characters
+            text = unicodedata.normalize("NFKC", text)
+
+            # Clean up extra whitespace
+            text = " ".join(text.split())
+
+            return text.strip()
+
+        try:
+            # Set user agent to avoid being blocked
+            headers = {
+                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit"
+                "/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
+            }
+
+            # Fetch the webpage content
+            response = requests.get(self._path, headers=headers, timeout=30)
+            response.raise_for_status()
+
+            # Determine encoding
+            if self._encoding is not None:
+                response.encoding = self._encoding
+            elif response.encoding == "ISO-8859-1":
+                response.encoding = response.apparent_encoding
+
+            # Parse HTML content
+            soup = BeautifulSoup(response.text, "html.parser")
+
+            # Remove script and style elements
+            for script in soup(["script", "style"]):
+                script.decompose()
+
+            # Get text content
+            text_content = soup.get_text(strip=True)
+
+            # Clean up whitespace
+            lines = (line.strip() for line in text_content.splitlines())
+            chunks = (phrase.strip() for line in lines for phrase in line.split("  "))
+            text_content = " ".join(chunk for chunk in chunks if chunk)
+            text_content = clean_text(text_content)
+
+            # Get page title if available
+            title = (
+                soup.title.string.strip() if soup.title and soup.title.string else ""
+            )
+            title = clean_text(title)
+
+            description = soup.find("meta", attrs={"name": "description"})
+            desc_content = description["content"] if description else ""
+            desc_content = clean_text(desc_content)
+
+            # Create metadata
+            metadata = {
+                "source": self._path,
+                "title": title,
+                "encoding": response.encoding,
+                "description": desc_content,
+            }
+
+            document = Document(content=text_content, metadata=metadata)
+            return [document]
+        except Exception as e:
+            raise ValueError(f"Failed to parse URL content: {str(e)}")
 
     @classmethod
     def support_chunk_strategy(cls) -> List[ChunkStrategy]: