dify/api/core/file/file_obj.py

import enum
from typing import Optional

from pydantic import BaseModel

from core.app.app_config.entities import FileExtraConfig
from core.file.tool_file_parser import ToolFileParser
from core.file.upload_file_parser import UploadFileParser
from core.model_runtime.entities.message_entities import ImagePromptMessageContent
from extensions.ext_database import db
from models.model import UploadFile


class FileType(enum.Enum):
    IMAGE = 'image'

    @staticmethod
    def value_of(value):
        for member in FileType:
            if member.value == value:
                return member
        raise ValueError(f"No matching enum found for value '{value}'")


class FileTransferMethod(enum.Enum):
    REMOTE_URL = 'remote_url'
    LOCAL_FILE = 'local_file'
    TOOL_FILE = 'tool_file'

    @staticmethod
    def value_of(value):
        for member in FileTransferMethod:
            if member.value == value:
                return member
        raise ValueError(f"No matching enum found for value '{value}'")

class FileBelongsTo(enum.Enum):
    USER = 'user'
    ASSISTANT = 'assistant'

    @staticmethod
    def value_of(value):
        for member in FileBelongsTo:
            if member.value == value:
                return member
        raise ValueError(f"No matching enum found for value '{value}'")


class FileVar(BaseModel):
    id: Optional[str] = None  # message file id
    tenant_id: str
    type: FileType
    transfer_method: FileTransferMethod
    url: Optional[str] = None  # remote url
    related_id: Optional[str] = None
    extra_config: Optional[FileExtraConfig] = None
    filename: Optional[str] = None
    extension: Optional[str] = None
    mime_type: Optional[str] = None

    def to_dict(self) -> dict:
        return {
            '__variant': self.__class__.__name__,
            'tenant_id': self.tenant_id,
            'type': self.type.value,
            'transfer_method': self.transfer_method.value,
            'url': self.preview_url,
            'remote_url': self.url,
            'related_id': self.related_id,
            'filename': self.filename,
            'extension': self.extension,
            'mime_type': self.mime_type,
        }

    def to_markdown(self) -> str:
        """
        Convert file to markdown
        :return:
        """
        preview_url = self.preview_url
        if self.type == FileType.IMAGE:
            text = f'![{self.filename or ""}]({preview_url})'
        else:
            text = f'[{self.filename or preview_url}]({preview_url})'

        return text

    @property
    def data(self) -> Optional[str]:
        """
        Get image data, file signed url or base64 data
        depending on config MULTIMODAL_SEND_IMAGE_FORMAT
        :return:
        """
        return self._get_data()

    @property
    def preview_url(self) -> Optional[str]:
        """
        Get signed preview url
        :return:
        """
        return self._get_data(force_url=True)

    @property
    def prompt_message_content(self) -> ImagePromptMessageContent:
        if self.type == FileType.IMAGE:
            image_config = self.extra_config.image_config

            return ImagePromptMessageContent(
                data=self.data,
                detail=ImagePromptMessageContent.DETAIL.HIGH
                if image_config.get("detail") == "high" else ImagePromptMessageContent.DETAIL.LOW
            )

    def _get_data(self, force_url: bool = False) -> Optional[str]:
        if self.type == FileType.IMAGE:
            if self.transfer_method == FileTransferMethod.REMOTE_URL:
                return self.url
            elif self.transfer_method == FileTransferMethod.LOCAL_FILE:
                upload_file = (db.session.query(UploadFile)
                               .filter(
                    UploadFile.id == self.related_id,
                    UploadFile.tenant_id == self.tenant_id
                ).first())

                return UploadFileParser.get_image_data(
                    upload_file=upload_file,
                    force_url=force_url
                )
            elif self.transfer_method == FileTransferMethod.TOOL_FILE:
                extension = self.extension
                # add sign url
                return ToolFileParser.get_tool_file_manager().sign_file(tool_file_id=self.related_id, extension=extension)

        return None