Refactor file listing API to return only file names and add new API for calculating file SHA256 hash

simple_server.py

@@ -8,7 +8,9 @@ import os
 import hashlib
 
 PORT = 8051
-DIRECTORY = "./data/db"
+# Get the absolute path to the directory where this script is located
+SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
+DIRECTORY = os.path.join(SCRIPT_DIR, "data", "db")
 
 # Ensure the data directory exists (if not already handled elsewhere)
 os.makedirs(DIRECTORY, exist_ok=True)
@@ -19,29 +21,36 @@ app = FastAPI()
 class DeleteFileRequest(BaseModel):
     name: str
 
-class FileInfo(BaseModel):
-    name: str
-    hash: str
-
-@app.post("/api/files/list", response_model=List[FileInfo])
+@app.post("/api/files/list", response_model=List[str])
 async def api_list_files():
     """
-    Lists all files and their SHA256 hashes in the data/db directory.
+    Lists all files in the data/db directory.
     """
     try:
-        files_with_hashes = []
-        for f in os.listdir(DIRECTORY):
-            file_path = os.path.join(DIRECTORY, f)
-            if os.path.isfile(file_path) and f.endswith(".db"):
-                hasher = hashlib.sha256()
-                with open(file_path, "rb") as afile:
-                    buf = afile.read()
-                    hasher.update(buf)
-                files_with_hashes.append({"name": f, "hash": hasher.hexdigest()})
-        return files_with_hashes
+        files = [f for f in os.listdir(DIRECTORY) if os.path.isfile(os.path.join(DIRECTORY, f)) and f.endswith(".db")]
+        return files
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"An error occurred while listing files: {e}")
 
+@app.post("/api/files/hash")
+async def api_file_hash(request: DeleteFileRequest):
+    """
+    Calculates and returns the SHA256 hash for a specific file.
+    """
+    file_path = os.path.join(DIRECTORY, request.name)
+    
+    if not os.path.exists(file_path) or not os.path.isfile(file_path):
+        raise HTTPException(status_code=404, detail=f"File not found: {request.name}")
+
+    try:
+        hasher = hashlib.sha256()
+        with open(file_path, "rb") as afile:
+            while chunk := afile.read(8192):
+                hasher.update(chunk)
+        return {"name": request.name, "hash": hasher.hexdigest()}
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Could not calculate hash for file: {e}")
+
 @app.post("/api/files/delete")
 async def api_delete_file(request: DeleteFileRequest):
     """