added .env + delete file + handle error when file didns saved but added to db

.gitignore

@@ -59,3 +59,4 @@ docs/_build/
 target/
 
 *.db
+.env

app/api.py

@@ -4,6 +4,10 @@ from sqlalchemy import exists
 import hashlib
 from . import db
 import os
+from dotenv import load_dotenv
+import os 
+load_dotenv()
+FILES_DIR = os.getenv("FILES_DIR")
 
 def compute_hash(data: bytes, algorithm="sha256") -> str:
     h = hashlib.new(algorithm)
@@ -12,7 +16,6 @@ def compute_hash(data: bytes, algorithm="sha256") -> str:
 
 app = FastAPI()
 
-FILES_DIR = "./files"
 
 @app.get("/")
 def root():
@@ -29,10 +32,13 @@ async def save_file(file: UploadFile = File(...)):
     if not existed_url:
         file_url = db.add_file(file.filename, file.content_type, file.size, hash)
     
-        print(f"{FILES_DIR}/{file_url}")
-        with open(f"{FILES_DIR}/{file_url}", "wb") as f:
-            f.write(contents)
-        return {"status": "saved", "filename": file_url}
+        try:
+            with open(f"{FILES_DIR}/{file_url}", "wb") as f:
+                f.write(contents)
+            return {"status": "saved", "filename": file_url}
+        except Exception as e:
+            db.remove_file(file_url)
+            return {"status": "error", "message": f"Could not save file {file_url}: {e}"}
     else:
         return {"status": "file_exists", "filename": existed_url}
 
@@ -48,6 +54,16 @@ def get_file(filename: str, raw: bool = False):
 
     return FileResponse(file_path, filename=filename)
 
+
+@app.delete("/file/{filename}")
+def delete_file(filename: str):
+    if db.remove_file(filename):
+        file_path = f"{FILES_DIR}/{filename}"
+        if os.path.exists(file_path):
+            os.remove(file_path)
+        return {"status": "deleted"}
+    return {"status": "error", "message": "no file like that"}
+
 @app.get("/files/")
 def get_list_of_files():
     files = db.get_all_files()

app/db.py

@@ -4,9 +4,13 @@ from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
 from sqlalchemy import select
 
-PADDING = 5
+from dotenv import load_dotenv
+import os 
+load_dotenv()
+PADDING = int(os.getenv("FILES_PADDING"))
+DATABASE_NAME = os.getenv("DATABASE_NAME")
 
-engine = create_engine("sqlite:///example.db")
+engine = create_engine(f"sqlite:///{DATABASE_NAME}.db")
 session = Session(bind=engine)
 
 class Base(DeclarativeBase): pass
@@ -38,6 +42,22 @@ def to_base36(n: int, width: int) -> str:
         result.append(chars[rem])
     return "".join(reversed(result)).rjust(width, "0")
 
+
+def from_base36(s: str) -> int:
+    chars = "0123456789abcdefghijklmnopqrstuvwxyz"
+    char_to_val = {c: i for i, c in enumerate(chars)}
+
+    s = s.lower().lstrip("0")
+    if not s:  
+        return 0
+
+    n = 0
+    for ch in s:
+        if ch not in char_to_val:
+            raise ValueError(f"Invalid base36 character: {ch}")
+        n = n * 36 + char_to_val[ch]
+    return n
+
 Base.metadata.create_all(bind=engine)
 
 def get_all_files():
@@ -83,6 +103,17 @@ def add_file(filename: str, content_type, size: int, hash):
 
         return url
 
+
+def remove_file(file_url: str):
+    with Session(autoflush=False, bind=engine) as db:
+        file_id = from_base36(file_url.rsplit(".")[0])
+        file = db.get(File, file_id)
+        if not file:
+            return None
+        db.delete(file)
+        db.commit() 
+        return True
+
 if __name__ == "__main__":
     for i in get_all_files():
         print(f"{i.id} {i.name}.{i.extension} ({i.hash}) {i.content_type} {i.size}")

pyproject.toml

@@ -5,6 +5,7 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "dotenv>=0.9.9",
     "fastapi>=0.116.1",
     "python-multipart>=0.0.20",
     "sqlalchemy>=2.0.43",

uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.12"
 
 [[package]]
@@ -46,6 +46,17 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d1/d6/3965ed04c63042e047cb6a3e6ed1a63a35087b6a609aa3a15ed8ac56c221/colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6", size = 25335, upload-time = "2022-10-25T02:36:20.889Z" },
 ]
 
+[[package]]
+name = "dotenv"
+version = "0.9.9"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "python-dotenv" },
+]
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/b2/b7/545d2c10c1fc15e48653c91efde329a790f2eecfbbf2bd16003b5db2bab0/dotenv-0.9.9-py2.py3-none-any.whl", hash = "sha256:29cf74a087b31dafdb5a446b6d7e11cbce8ed2741540e2339c69fbef92c94ce9", size = 1892, upload-time = "2025-02-19T22:15:01.647Z" },
+]
+
 [[package]]
 name = "fastapi"
 version = "0.116.1"
@@ -168,6 +179,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/6f/9a/e73262f6c6656262b5fdd723ad90f518f579b7bc8622e43a942eec53c938/pydantic_core-2.33.2-cp313-cp313t-win_amd64.whl", hash = "sha256:c2fc0a768ef76c15ab9238afa6da7f69895bb5d1ee83aeea2e3509af4472d0b9", size = 1935777, upload-time = "2025-04-23T18:32:25.088Z" },
 ]
 
+[[package]]
+name = "python-dotenv"
+version = "1.1.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f6/b0/4bc07ccd3572a2f9df7e6782f52b0c6c90dcbb803ac4a167702d7d0dfe1e/python_dotenv-1.1.1.tar.gz", hash = "sha256:a8a6399716257f45be6a007360200409fce5cda2661e3dec71d23dc15f6189ab", size = 41978, upload-time = "2025-06-24T04:21:07.341Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/5f/ed/539768cf28c661b5b068d66d96a2f155c4971a5d55684a514c1a0e0dec2f/python_dotenv-1.1.1-py3-none-any.whl", hash = "sha256:31f23644fe2602f88ff55e1f5c79ba497e01224ee7737937930c448e4d0e24dc", size = 20556, upload-time = "2025-06-24T04:21:06.073Z" },
+]
+
 [[package]]
 name = "python-multipart"
 version = "0.0.20"
@@ -182,6 +202,7 @@ name = "sfs"
 version = "0.1.0"
 source = { virtual = "." }
 dependencies = [
+    { name = "dotenv" },
     { name = "fastapi" },
     { name = "python-multipart" },
     { name = "sqlalchemy" },
@@ -190,6 +211,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
+    { name = "dotenv", specifier = ">=0.9.9" },
     { name = "fastapi", specifier = ">=0.116.1" },
     { name = "python-multipart", specifier = ">=0.0.20" },
     { name = "sqlalchemy", specifier = ">=2.0.43" },