516 lines
18 KiB
Python
516 lines
18 KiB
Python
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# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2025)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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from dataclasses import dataclass
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from textwrap import dedent
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from typing import TYPE_CHECKING, Literal, Union, cast, overload
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from typing_extensions import TypeAlias
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from streamlit import config
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from streamlit.elements.lib.file_uploader_utils import (
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enforce_filename_restriction,
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normalize_upload_file_type,
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)
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from streamlit.elements.lib.form_utils import current_form_id
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from streamlit.elements.lib.layout_utils import (
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LayoutConfig,
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WidthWithoutContent,
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validate_width,
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)
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from streamlit.elements.lib.policies import (
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check_widget_policies,
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maybe_raise_label_warnings,
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)
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from streamlit.elements.lib.utils import (
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Key,
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LabelVisibility,
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compute_and_register_element_id,
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get_label_visibility_proto_value,
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to_key,
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)
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from streamlit.proto.Common_pb2 import FileUploaderState as FileUploaderStateProto
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from streamlit.proto.Common_pb2 import UploadedFileInfo as UploadedFileInfoProto
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from streamlit.proto.FileUploader_pb2 import FileUploader as FileUploaderProto
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from streamlit.runtime.metrics_util import gather_metrics
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from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx
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from streamlit.runtime.state import (
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WidgetArgs,
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WidgetCallback,
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WidgetKwargs,
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register_widget,
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)
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from streamlit.runtime.uploaded_file_manager import DeletedFile, UploadedFile
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if TYPE_CHECKING:
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from collections.abc import Sequence
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from streamlit.delta_generator import DeltaGenerator
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SomeUploadedFiles: TypeAlias = Union[
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UploadedFile,
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DeletedFile,
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list[Union[UploadedFile, DeletedFile]],
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None,
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]
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def _get_upload_files(
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widget_value: FileUploaderStateProto | None,
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) -> list[UploadedFile | DeletedFile]:
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if widget_value is None:
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return []
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ctx = get_script_run_ctx()
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if ctx is None:
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return []
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uploaded_file_info = widget_value.uploaded_file_info
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if len(uploaded_file_info) == 0:
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return []
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file_recs_list = ctx.uploaded_file_mgr.get_files(
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session_id=ctx.session_id,
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file_ids=[f.file_id for f in uploaded_file_info],
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)
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file_recs = {f.file_id: f for f in file_recs_list}
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collected_files: list[UploadedFile | DeletedFile] = []
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for f in uploaded_file_info:
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maybe_file_rec = file_recs.get(f.file_id)
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if maybe_file_rec is not None:
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uploaded_file = UploadedFile(maybe_file_rec, f.file_urls)
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collected_files.append(uploaded_file)
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else:
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collected_files.append(DeletedFile(f.file_id))
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return collected_files
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@dataclass
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class FileUploaderSerde:
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accept_multiple_files: bool
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allowed_types: Sequence[str] | None = None
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def deserialize(self, ui_value: FileUploaderStateProto | None) -> SomeUploadedFiles:
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upload_files = _get_upload_files(ui_value)
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for file in upload_files:
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if isinstance(file, DeletedFile):
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continue
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if self.allowed_types:
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enforce_filename_restriction(file.name, self.allowed_types)
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if len(upload_files) == 0:
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return_value: SomeUploadedFiles = [] if self.accept_multiple_files else None
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else:
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return_value = (
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upload_files if self.accept_multiple_files else upload_files[0]
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)
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return return_value
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def serialize(self, files: SomeUploadedFiles) -> FileUploaderStateProto:
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state_proto = FileUploaderStateProto()
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if not files:
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return state_proto
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if not isinstance(files, list):
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files = [files]
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for f in files:
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if isinstance(f, DeletedFile):
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continue
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file_info: UploadedFileInfoProto = state_proto.uploaded_file_info.add()
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file_info.file_id = f.file_id
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file_info.name = f.name
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file_info.size = f.size
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file_info.file_urls.CopyFrom(f._file_urls)
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return state_proto
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class FileUploaderMixin:
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# Multiple overloads are defined on `file_uploader()` below to represent
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# the different return types of `file_uploader()`.
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# These return types differ according to the value of the `accept_multiple_files` argument.
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# There are 2 associated variables, each with 2 options.
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# 1. The `accept_multiple_files` argument is set as `True`,
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# or it is set as `False` or omitted, in which case the default value `False`.
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# 2. The `type` argument may or may not be provided as a keyword-only argument.
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# There must be 2x2=4 overloads to cover all the possible arguments,
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# as these overloads must be mutually exclusive for mypy.
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# 1. type is given as not a keyword-only argument
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# 2. accept_multiple_files = True
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@overload
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def file_uploader(
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self,
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label: str,
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type: str | Sequence[str] | None,
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accept_multiple_files: Literal[True],
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*,
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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) -> list[UploadedFile]: ...
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# 1. type is given as not a keyword-only argument
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# 2. accept_multiple_files = False or omitted
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@overload
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def file_uploader(
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self,
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label: str,
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type: str | Sequence[str] | None,
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accept_multiple_files: Literal[False] = False,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*,
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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) -> UploadedFile | None: ...
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# The following 2 overloads represent the cases where
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# the `type` argument is a keyword-only argument.
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# See https://github.com/python/mypy/issues/4020#issuecomment-737600893
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# for the related discussions and examples.
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# 1. type is skipped or a keyword argument
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# 2. accept_multiple_files = True
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@overload
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def file_uploader(
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self,
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label: str,
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*,
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accept_multiple_files: Literal[True],
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type: str | Sequence[str] | None = None,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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) -> list[UploadedFile]: ...
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# 1. type is skipped or a keyword argument
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# 2. accept_multiple_files = False or omitted
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@overload
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def file_uploader(
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self,
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label: str,
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*,
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accept_multiple_files: Literal[False] = False,
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type: str | Sequence[str] | None = None,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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) -> UploadedFile | None: ...
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@gather_metrics("file_uploader")
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def file_uploader(
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self,
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label: str,
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type: str | Sequence[str] | None = None,
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accept_multiple_files: bool = False,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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) -> UploadedFile | list[UploadedFile] | None:
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r"""Display a file uploader widget.
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By default, uploaded files are limited to 200 MB each. You can
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configure this using the ``server.maxUploadSize`` config option. For
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more information on how to set config options, see |config.toml|_.
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.. |config.toml| replace:: ``config.toml``
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.. _config.toml: https://docs.streamlit.io/develop/api-reference/configuration/config.toml
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Parameters
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----------
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label : str
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A short label explaining to the user what this file uploader is for.
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The label can optionally contain GitHub-flavored Markdown of the
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following types: Bold, Italics, Strikethroughs, Inline Code, Links,
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and Images. Images display like icons, with a max height equal to
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the font height.
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Unsupported Markdown elements are unwrapped so only their children
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(text contents) render. Display unsupported elements as literal
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characters by backslash-escaping them. E.g.,
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``"1\. Not an ordered list"``.
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See the ``body`` parameter of |st.markdown|_ for additional,
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supported Markdown directives.
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For accessibility reasons, you should never set an empty label, but
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you can hide it with ``label_visibility`` if needed. In the future,
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we may disallow empty labels by raising an exception.
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.. |st.markdown| replace:: ``st.markdown``
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.. _st.markdown: https://docs.streamlit.io/develop/api-reference/text/st.markdown
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type : str or list of str or None
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The allowed file extension(s) for uploaded files. This can be one
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of the following types:
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- ``None`` (default): All file extensions are allowed.
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- A string: A single file extension is allowed. For example, to
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only accept CSV files, use ``"csv"``.
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- A sequence of strings: Multiple file extensions are allowed. For
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example, to only accept JPG/JPEG and PNG files, use
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``["jpg", "jpeg", "png"]``.
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accept_multiple_files : bool
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Whether to accept more than one file in a submission. If this is
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``False`` (default), the user can only submit one file at a time.
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If this is ``True``, the user can upload multiple files at the same
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time, in which case the return value will be a list of files.
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key : str or int
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An optional string or integer to use as the unique key for the widget.
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If this is omitted, a key will be generated for the widget
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based on its content. No two widgets may have the same key.
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help : str or None
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A tooltip that gets displayed next to the widget label. Streamlit
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only displays the tooltip when ``label_visibility="visible"``. If
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this is ``None`` (default), no tooltip is displayed.
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The tooltip can optionally contain GitHub-flavored Markdown,
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including the Markdown directives described in the ``body``
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parameter of ``st.markdown``.
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on_change : callable
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An optional callback invoked when this file_uploader's value
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changes.
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args : tuple
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An optional tuple of args to pass to the callback.
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kwargs : dict
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An optional dict of kwargs to pass to the callback.
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disabled : bool
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An optional boolean that disables the file uploader if set to
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``True``. The default is ``False``.
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label_visibility : "visible", "hidden", or "collapsed"
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The visibility of the label. The default is ``"visible"``. If this
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is ``"hidden"``, Streamlit displays an empty spacer instead of the
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label, which can help keep the widget aligned with other widgets.
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If this is ``"collapsed"``, Streamlit displays no label or spacer.
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width : "stretch" or int
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The width of the file uploader widget. This can be one of the
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following:
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- ``"stretch"`` (default): The width of the widget matches the
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width of the parent container.
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- An integer specifying the width in pixels: The widget has a
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fixed width. If the specified width is greater than the width of
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the parent container, the width of the widget matches the width
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of the parent container.
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Returns
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-------
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None, UploadedFile, or list of UploadedFile
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- If accept_multiple_files is False, returns either None or
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an UploadedFile object.
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- If accept_multiple_files is True, returns a list with the
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uploaded files as UploadedFile objects. If no files were
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uploaded, returns an empty list.
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The UploadedFile class is a subclass of BytesIO, and therefore is
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"file-like". This means you can pass an instance of it anywhere a
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file is expected.
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Examples
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--------
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Insert a file uploader that accepts a single file at a time:
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>>> import streamlit as st
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>>> import pandas as pd
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>>> from io import StringIO
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>>>
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|
|
>>> uploaded_file = st.file_uploader("Choose a file")
|
||
|
|
>>> if uploaded_file is not None:
|
||
|
|
... # To read file as bytes:
|
||
|
|
... bytes_data = uploaded_file.getvalue()
|
||
|
|
... st.write(bytes_data)
|
||
|
|
>>>
|
||
|
|
... # To convert to a string based IO:
|
||
|
|
... stringio = StringIO(uploaded_file.getvalue().decode("utf-8"))
|
||
|
|
... st.write(stringio)
|
||
|
|
>>>
|
||
|
|
... # To read file as string:
|
||
|
|
... string_data = stringio.read()
|
||
|
|
... st.write(string_data)
|
||
|
|
>>>
|
||
|
|
... # Can be used wherever a "file-like" object is accepted:
|
||
|
|
... dataframe = pd.read_csv(uploaded_file)
|
||
|
|
... st.write(dataframe)
|
||
|
|
|
||
|
|
Insert a file uploader that accepts multiple files at a time:
|
||
|
|
|
||
|
|
>>> import streamlit as st
|
||
|
|
>>>
|
||
|
|
>>> uploaded_files = st.file_uploader(
|
||
|
|
... "Choose a CSV file", accept_multiple_files=True
|
||
|
|
... )
|
||
|
|
>>> for uploaded_file in uploaded_files:
|
||
|
|
... bytes_data = uploaded_file.read()
|
||
|
|
... st.write("filename:", uploaded_file.name)
|
||
|
|
... st.write(bytes_data)
|
||
|
|
|
||
|
|
.. output::
|
||
|
|
https://doc-file-uploader.streamlit.app/
|
||
|
|
height: 375px
|
||
|
|
|
||
|
|
"""
|
||
|
|
ctx = get_script_run_ctx()
|
||
|
|
return self._file_uploader(
|
||
|
|
label=label,
|
||
|
|
type=type,
|
||
|
|
accept_multiple_files=accept_multiple_files,
|
||
|
|
key=key,
|
||
|
|
help=help,
|
||
|
|
on_change=on_change,
|
||
|
|
args=args,
|
||
|
|
kwargs=kwargs,
|
||
|
|
disabled=disabled,
|
||
|
|
label_visibility=label_visibility,
|
||
|
|
width=width,
|
||
|
|
ctx=ctx,
|
||
|
|
)
|
||
|
|
|
||
|
|
def _file_uploader(
|
||
|
|
self,
|
||
|
|
label: str,
|
||
|
|
type: str | Sequence[str] | None = None,
|
||
|
|
accept_multiple_files: bool = False,
|
||
|
|
key: Key | None = None,
|
||
|
|
help: str | None = None,
|
||
|
|
on_change: WidgetCallback | None = None,
|
||
|
|
args: WidgetArgs | None = None,
|
||
|
|
kwargs: WidgetKwargs | None = None,
|
||
|
|
*, # keyword-only arguments:
|
||
|
|
label_visibility: LabelVisibility = "visible",
|
||
|
|
disabled: bool = False,
|
||
|
|
ctx: ScriptRunContext | None = None,
|
||
|
|
width: WidthWithoutContent = "stretch",
|
||
|
|
) -> UploadedFile | list[UploadedFile] | None:
|
||
|
|
key = to_key(key)
|
||
|
|
|
||
|
|
check_widget_policies(
|
||
|
|
self.dg,
|
||
|
|
key,
|
||
|
|
on_change,
|
||
|
|
default_value=None,
|
||
|
|
writes_allowed=False,
|
||
|
|
)
|
||
|
|
maybe_raise_label_warnings(label, label_visibility)
|
||
|
|
|
||
|
|
element_id = compute_and_register_element_id(
|
||
|
|
"file_uploader",
|
||
|
|
user_key=key,
|
||
|
|
form_id=current_form_id(self.dg),
|
||
|
|
dg=self.dg,
|
||
|
|
label=label,
|
||
|
|
type=type,
|
||
|
|
accept_multiple_files=accept_multiple_files,
|
||
|
|
help=help,
|
||
|
|
width=width,
|
||
|
|
)
|
||
|
|
|
||
|
|
normalized_type = normalize_upload_file_type(type) if type else None
|
||
|
|
|
||
|
|
file_uploader_proto = FileUploaderProto()
|
||
|
|
file_uploader_proto.id = element_id
|
||
|
|
file_uploader_proto.label = label
|
||
|
|
file_uploader_proto.type[:] = (
|
||
|
|
normalized_type if normalized_type is not None else []
|
||
|
|
)
|
||
|
|
file_uploader_proto.max_upload_size_mb = config.get_option(
|
||
|
|
"server.maxUploadSize"
|
||
|
|
)
|
||
|
|
file_uploader_proto.multiple_files = accept_multiple_files
|
||
|
|
file_uploader_proto.form_id = current_form_id(self.dg)
|
||
|
|
file_uploader_proto.disabled = disabled
|
||
|
|
file_uploader_proto.label_visibility.value = get_label_visibility_proto_value(
|
||
|
|
label_visibility
|
||
|
|
)
|
||
|
|
|
||
|
|
if help is not None:
|
||
|
|
file_uploader_proto.help = dedent(help)
|
||
|
|
|
||
|
|
serde = FileUploaderSerde(accept_multiple_files, allowed_types=normalized_type)
|
||
|
|
|
||
|
|
# FileUploader's widget value is a list of file IDs
|
||
|
|
# representing the current set of files that this uploader should
|
||
|
|
# know about.
|
||
|
|
widget_state = register_widget(
|
||
|
|
file_uploader_proto.id,
|
||
|
|
on_change_handler=on_change,
|
||
|
|
args=args,
|
||
|
|
kwargs=kwargs,
|
||
|
|
deserializer=serde.deserialize,
|
||
|
|
serializer=serde.serialize,
|
||
|
|
ctx=ctx,
|
||
|
|
value_type="file_uploader_state_value",
|
||
|
|
)
|
||
|
|
|
||
|
|
validate_width(width)
|
||
|
|
layout_config = LayoutConfig(width=width)
|
||
|
|
|
||
|
|
self.dg._enqueue(
|
||
|
|
"file_uploader", file_uploader_proto, layout_config=layout_config
|
||
|
|
)
|
||
|
|
|
||
|
|
if isinstance(widget_state.value, DeletedFile):
|
||
|
|
return None
|
||
|
|
if isinstance(widget_state.value, list):
|
||
|
|
return [f for f in widget_state.value if not isinstance(f, DeletedFile)]
|
||
|
|
|
||
|
|
return widget_state.value
|
||
|
|
|
||
|
|
@property
|
||
|
|
def dg(self) -> DeltaGenerator:
|
||
|
|
"""Get our DeltaGenerator."""
|
||
|
|
return cast("DeltaGenerator", self)
|