dify/api/core/prompt/utils/prompt_message_util.py

from typing import cast

from core.model_runtime.entities.message_entities import (
    ImagePromptMessageContent,
    PromptMessage,
    PromptMessageContentType,
    PromptMessageRole,
    TextPromptMessageContent,
)
from core.prompt.simple_prompt_transform import ModelMode


class PromptMessageUtil:
    @staticmethod
    def prompt_messages_to_prompt_for_saving(model_mode: str, prompt_messages: list[PromptMessage]) -> list[dict]:
        """
        Prompt messages to prompt for saving.
        :param model_mode: model mode
        :param prompt_messages: prompt messages
        :return:
        """
        prompts = []
        if model_mode == ModelMode.CHAT.value:
            for prompt_message in prompt_messages:
                if prompt_message.role == PromptMessageRole.USER:
                    role = 'user'
                elif prompt_message.role == PromptMessageRole.ASSISTANT:
                    role = 'assistant'
                elif prompt_message.role == PromptMessageRole.SYSTEM:
                    role = 'system'
                else:
                    continue

                text = ''
                files = []
                if isinstance(prompt_message.content, list):
                    for content in prompt_message.content:
                        if content.type == PromptMessageContentType.TEXT:
                            content = cast(TextPromptMessageContent, content)
                            text += content.data
                        else:
                            content = cast(ImagePromptMessageContent, content)
                            files.append({
                                "type": 'image',
                                "data": content.data[:10] + '...[TRUNCATED]...' + content.data[-10:],
                                "detail": content.detail.value
                            })
                else:
                    text = prompt_message.content

                prompts.append({
                    "role": role,
                    "text": text,
                    "files": files
                })
        else:
            prompt_message = prompt_messages[0]
            text = ''
            files = []
            if isinstance(prompt_message.content, list):
                for content in prompt_message.content:
                    if content.type == PromptMessageContentType.TEXT:
                        content = cast(TextPromptMessageContent, content)
                        text += content.data
                    else:
                        content = cast(ImagePromptMessageContent, content)
                        files.append({
                            "type": 'image',
                            "data": content.data[:10] + '...[TRUNCATED]...' + content.data[-10:],
                            "detail": content.detail.value
                        })
            else:
                text = prompt_message.content

            params = {
                "role": 'user',
                "text": text,
            }

            if files:
                params['files'] = files

            prompts.append(params)

        return prompts