llama-stack-mirror/llama_stack/providers/remote/files/s3/files.py

# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.

import uuid
from datetime import UTC, datetime
from typing import Annotated, Any

import boto3
from botocore.exceptions import BotoCoreError, ClientError, NoCredentialsError
from fastapi import Depends, File, Form, Response, UploadFile

from llama_stack.apis.common.errors import ResourceNotFoundError
from llama_stack.apis.common.responses import Order
from llama_stack.apis.files import (
    ExpiresAfter,
    Files,
    ListOpenAIFileResponse,
    OpenAIFileDeleteResponse,
    OpenAIFileObject,
    OpenAIFilePurpose,
)
from llama_stack.core.datatypes import AccessRule
from llama_stack.providers.utils.files.form_data import parse_expires_after
from llama_stack.providers.utils.sqlstore.api import ColumnDefinition, ColumnType
from llama_stack.providers.utils.sqlstore.authorized_sqlstore import AuthorizedSqlStore
from llama_stack.providers.utils.sqlstore.sqlstore import sqlstore_impl

from .config import S3FilesImplConfig

# TODO: provider data for S3 credentials


def _create_s3_client(config: S3FilesImplConfig) -> boto3.client:
    try:
        s3_config = {
            "region_name": config.region,
        }

        # endpoint URL if specified (for MinIO, LocalStack, etc.)
        if config.endpoint_url:
            s3_config["endpoint_url"] = config.endpoint_url

        if config.aws_access_key_id and config.aws_secret_access_key:
            s3_config.update(
                {
                    "aws_access_key_id": config.aws_access_key_id,
                    "aws_secret_access_key": config.aws_secret_access_key,
                }
            )

        return boto3.client("s3", **s3_config)

    except (BotoCoreError, NoCredentialsError) as e:
        raise RuntimeError(f"Failed to initialize S3 client: {e}") from e


async def _create_bucket_if_not_exists(client: boto3.client, config: S3FilesImplConfig) -> None:
    try:
        client.head_bucket(Bucket=config.bucket_name)
    except ClientError as e:
        error_code = e.response["Error"]["Code"]
        if error_code == "404":
            if not config.auto_create_bucket:
                raise RuntimeError(
                    f"S3 bucket '{config.bucket_name}' does not exist. "
                    f"Either create the bucket manually or set 'auto_create_bucket: true' in your configuration."
                ) from e
            try:
                # For us-east-1, we can't specify LocationConstraint
                if config.region == "us-east-1":
                    client.create_bucket(Bucket=config.bucket_name)
                else:
                    client.create_bucket(
                        Bucket=config.bucket_name,
                        CreateBucketConfiguration={"LocationConstraint": config.region},
                    )
            except ClientError as create_error:
                raise RuntimeError(
                    f"Failed to create S3 bucket '{config.bucket_name}': {create_error}"
                ) from create_error
        elif error_code == "403":
            raise RuntimeError(f"Access denied to S3 bucket '{config.bucket_name}'") from e
        else:
            raise RuntimeError(f"Failed to access S3 bucket '{config.bucket_name}': {e}") from e


def _make_file_object(
    *,
    id: str,
    filename: str,
    purpose: str,
    bytes: int,
    created_at: int,
    expires_at: int,
    **kwargs: Any,  # here to ignore any additional fields, e.g. extra fields from AuthorizedSqlStore
) -> OpenAIFileObject:
    """
    Construct an OpenAIFileObject and normalize expires_at.

    If expires_at is greater than the max we treat it as no-expiration and
    return None for expires_at.

    The OpenAI spec says expires_at type is Integer, but the implementation
    will return None for no expiration.
    """
    obj = OpenAIFileObject(
        id=id,
        filename=filename,
        purpose=OpenAIFilePurpose(purpose),
        bytes=bytes,
        created_at=created_at,
        expires_at=expires_at,
    )

    if obj.expires_at is not None and obj.expires_at > (obj.created_at + ExpiresAfter.MAX):
        obj.expires_at = None  # type: ignore

    return obj


class S3FilesImpl(Files):
    """S3-based implementation of the Files API."""

    def __init__(self, config: S3FilesImplConfig, policy: list[AccessRule]) -> None:
        self._config = config
        self.policy = policy
        self._client: boto3.client | None = None
        self._sql_store: AuthorizedSqlStore | None = None

    def _now(self) -> int:
        """Return current UTC timestamp as int seconds."""
        return int(datetime.now(UTC).timestamp())

    async def _get_file(self, file_id: str, return_expired: bool = False) -> dict[str, Any]:
        where: dict[str, str | dict] = {"id": file_id}
        if not return_expired:
            where["expires_at"] = {">": self._now()}
        if not (row := await self.sql_store.fetch_one("openai_files", where=where)):
            raise ResourceNotFoundError(file_id, "File", "files.list()")
        return row

    async def _delete_file(self, file_id: str) -> None:
        """Delete a file from S3 and the database."""
        try:
            self.client.delete_object(
                Bucket=self._config.bucket_name,
                Key=file_id,
            )
        except ClientError as e:
            if e.response["Error"]["Code"] != "NoSuchKey":
                raise RuntimeError(f"Failed to delete file from S3: {e}") from e

        await self.sql_store.delete("openai_files", where={"id": file_id})

    async def _delete_if_expired(self, file_id: str) -> None:
        """If the file exists and is expired, delete it."""
        if row := await self._get_file(file_id, return_expired=True):
            if (expires_at := row.get("expires_at")) and expires_at <= self._now():
                await self._delete_file(file_id)

    async def initialize(self) -> None:
        self._client = _create_s3_client(self._config)
        await _create_bucket_if_not_exists(self._client, self._config)

        self._sql_store = AuthorizedSqlStore(sqlstore_impl(self._config.metadata_store), self.policy)
        await self._sql_store.create_table(
            "openai_files",
            {
                "id": ColumnDefinition(type=ColumnType.STRING, primary_key=True),
                "filename": ColumnType.STRING,
                "purpose": ColumnType.STRING,
                "bytes": ColumnType.INTEGER,
                "created_at": ColumnType.INTEGER,
                "expires_at": ColumnType.INTEGER,
                # TODO: add s3_etag field for integrity checking
            },
        )

    async def shutdown(self) -> None:
        pass

    @property
    def client(self) -> boto3.client:
        assert self._client is not None, "Provider not initialized"
        return self._client

    @property
    def sql_store(self) -> AuthorizedSqlStore:
        assert self._sql_store is not None, "Provider not initialized"
        return self._sql_store

    async def openai_upload_file(
        self,
        file: Annotated[UploadFile, File()],
        purpose: Annotated[OpenAIFilePurpose, Form()],
        expires_after: Annotated[ExpiresAfter | None, Depends(parse_expires_after)] = None,
    ) -> OpenAIFileObject:
        file_id = f"file-{uuid.uuid4().hex}"

        filename = getattr(file, "filename", None) or "uploaded_file"

        created_at = self._now()

        # the default is no expiration.
        # to implement no expiration we set an expiration beyond the max.
        # we'll hide this fact from users when returning the file object.
        expires_at = created_at + ExpiresAfter.MAX * 42
        # the default for BATCH files is 30 days, which happens to be the expiration max.
        if purpose == OpenAIFilePurpose.BATCH:
            expires_at = created_at + ExpiresAfter.MAX

        if expires_after is not None:
            expires_at = created_at + expires_after.seconds

        content = await file.read()
        file_size = len(content)

        entry: dict[str, Any] = {
            "id": file_id,
            "filename": filename,
            "purpose": purpose.value,
            "bytes": file_size,
            "created_at": created_at,
            "expires_at": expires_at,
        }

        await self.sql_store.insert("openai_files", entry)

        try:
            self.client.put_object(
                Bucket=self._config.bucket_name,
                Key=file_id,
                Body=content,
                # TODO: enable server-side encryption
            )
        except ClientError as e:
            await self.sql_store.delete("openai_files", where={"id": file_id})

            raise RuntimeError(f"Failed to upload file to S3: {e}") from e

        return _make_file_object(**entry)

    async def openai_list_files(
        self,
        after: str | None = None,
        limit: int | None = 10000,
        order: Order | None = Order.desc,
        purpose: OpenAIFilePurpose | None = None,
    ) -> ListOpenAIFileResponse:
        # this purely defensive. it should not happen because the router also default to Order.desc.
        if not order:
            order = Order.desc

        where_conditions: dict[str, Any] = {"expires_at": {">": self._now()}}
        if purpose:
            where_conditions["purpose"] = purpose.value

        paginated_result = await self.sql_store.fetch_all(
            table="openai_files",
            where=where_conditions,
            order_by=[("created_at", order.value)],
            cursor=("id", after) if after else None,
            limit=limit,
        )

        files = [_make_file_object(**row) for row in paginated_result.data]

        return ListOpenAIFileResponse(
            data=files,
            has_more=paginated_result.has_more,
            # empty string or None? spec says str, ref impl returns str | None, we go with spec
            first_id=files[0].id if files else "",
            last_id=files[-1].id if files else "",
        )

    async def openai_retrieve_file(self, file_id: str) -> OpenAIFileObject:
        await self._delete_if_expired(file_id)
        row = await self._get_file(file_id)
        return _make_file_object(**row)

    async def openai_delete_file(self, file_id: str) -> OpenAIFileDeleteResponse:
        await self._delete_if_expired(file_id)
        _ = await self._get_file(file_id)  # raises if not found
        await self._delete_file(file_id)
        return OpenAIFileDeleteResponse(id=file_id, deleted=True)

    async def openai_retrieve_file_content(self, file_id: str) -> Response:
        await self._delete_if_expired(file_id)

        row = await self._get_file(file_id)

        try:
            response = self.client.get_object(
                Bucket=self._config.bucket_name,
                Key=row["id"],
            )
            # TODO: can we stream this instead of loading it into memory
            content = response["Body"].read()
        except ClientError as e:
            if e.response["Error"]["Code"] == "NoSuchKey":
                await self._delete_file(file_id)
                raise ResourceNotFoundError(file_id, "File", "files.list()") from e
            raise RuntimeError(f"Failed to download file from S3: {e}") from e

        return Response(
            content=content,
            media_type="application/octet-stream",
            headers={"Content-Disposition": f'attachment; filename="{row["filename"]}"'},
        )