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import base64
from configs import dify_config
from core.file import file_repository
from core.helper import ssrf_proxy
from core.model_runtime.entities import AudioPromptMessageContent, ImagePromptMessageContent
from extensions.ext_database import db
from extensions.ext_storage import storage
from . import helpers
from .enums import FileAttribute
from .models import File, FileTransferMethod, FileType
from .tool_file_parser import ToolFileParser
def get_attr(*, file: File, attr: FileAttribute):
match attr:
case FileAttribute.TYPE:
return file.type.value
case FileAttribute.SIZE:
return file.size
case FileAttribute.NAME:
return file.filename
case FileAttribute.MIME_TYPE:
return file.mime_type
case FileAttribute.TRANSFER_METHOD:
return file.transfer_method.value
case FileAttribute.URL:
return file.remote_url
case FileAttribute.EXTENSION:
return file.extension
case _:
raise ValueError(f"Invalid file attribute: {attr}")
def to_prompt_message_content(f: File, /):
"""
Convert a File object to an ImagePromptMessageContent object.
This function takes a File object and converts it to an ImagePromptMessageContent
object, which can be used as a prompt for image-based AI models.
Args:
file (File): The File object to convert. Must be of type FileType.IMAGE.
Returns:
ImagePromptMessageContent: An object containing the image data and detail level.
Raises:
ValueError: If the file is not an image or if the file data is missing.
Note:
The detail level of the image prompt is determined by the file's extra_config.
If not specified, it defaults to ImagePromptMessageContent.DETAIL.LOW.
"""
match f.type:
case FileType.IMAGE:
if dify_config.MULTIMODAL_SEND_IMAGE_FORMAT == "url":
data = _to_url(f)
else:
data = _to_base64_data_string(f)
if f._extra_config and f._extra_config.image_config and f._extra_config.image_config.detail:
detail = f._extra_config.image_config.detail
else:
detail = ImagePromptMessageContent.DETAIL.LOW
return ImagePromptMessageContent(data=data, detail=detail)
case FileType.AUDIO:
encoded_string = _file_to_encoded_string(f)
if f.extension is None:
raise ValueError("Missing file extension")
return AudioPromptMessageContent(data=encoded_string, format=f.extension.lstrip("."))
case _:
raise ValueError(f"file type {f.type} is not supported")
def download(f: File, /):
if f.transfer_method == FileTransferMethod.TOOL_FILE:
tool_file = file_repository.get_tool_file(session=db.session(), file=f)
return _download_file_content(tool_file.file_key)
elif f.transfer_method == FileTransferMethod.LOCAL_FILE:
upload_file = file_repository.get_upload_file(session=db.session(), file=f)
return _download_file_content(upload_file.key)
# remote file
response = ssrf_proxy.get(f.remote_url, follow_redirects=True)
response.raise_for_status()
return response.content
def _download_file_content(path: str, /):
"""
Download and return the contents of a file as bytes.
This function loads the file from storage and ensures it's in bytes format.
Args:
path (str): The path to the file in storage.
Returns:
bytes: The contents of the file as a bytes object.
Raises:
ValueError: If the loaded file is not a bytes object.
"""
data = storage.load(path, stream=False)
if not isinstance(data, bytes):
raise ValueError(f"file {path} is not a bytes object")
return data
def _get_encoded_string(f: File, /):
match f.transfer_method:
case FileTransferMethod.REMOTE_URL:
response = ssrf_proxy.get(f.remote_url)
response.raise_for_status()
content = response.content
encoded_string = base64.b64encode(content).decode("utf-8")
return encoded_string
case FileTransferMethod.LOCAL_FILE:
upload_file = file_repository.get_upload_file(session=db.session(), file=f)
data = _download_file_content(upload_file.key)
encoded_string = base64.b64encode(data).decode("utf-8")
return encoded_string
case FileTransferMethod.TOOL_FILE:
tool_file = file_repository.get_tool_file(session=db.session(), file=f)
data = _download_file_content(tool_file.file_key)
encoded_string = base64.b64encode(data).decode("utf-8")
return encoded_string
case _:
raise ValueError(f"Unsupported transfer method: {f.transfer_method}")
def _to_base64_data_string(f: File, /):
encoded_string = _get_encoded_string(f)
return f"data:{f.mime_type};base64,{encoded_string}"
def _file_to_encoded_string(f: File, /):
match f.type:
case FileType.IMAGE:
return _to_base64_data_string(f)
case FileType.AUDIO:
return _get_encoded_string(f)
case _:
raise ValueError(f"file type {f.type} is not supported")
def _to_url(f: File, /):
if f.transfer_method == FileTransferMethod.REMOTE_URL:
if f.remote_url is None:
raise ValueError("Missing file remote_url")
return f.remote_url
elif f.transfer_method == FileTransferMethod.LOCAL_FILE:
if f.related_id is None:
raise ValueError("Missing file related_id")
return helpers.get_signed_file_url(upload_file_id=f.related_id)
elif f.transfer_method == FileTransferMethod.TOOL_FILE:
# add sign url
if f.related_id is None or f.extension is None:
raise ValueError("Missing file related_id or extension")
return ToolFileParser.get_tool_file_manager().sign_file(tool_file_id=f.related_id, extension=f.extension)
else:
raise ValueError(f"Unsupported transfer method: {f.transfer_method}")
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