dify/api/core/tools/provider/tool_provider.py

from abc import ABC, abstractmethod
from typing import Any, Optional

from pydantic import BaseModel

from core.tools.entities.tool_entities import (
    ToolParameter,
    ToolProviderCredentials,
    ToolProviderIdentity,
    ToolProviderType,
)
from core.tools.errors import ToolNotFoundError, ToolParameterValidationError, ToolProviderCredentialValidationError
from core.tools.tool.tool import Tool
from core.tools.utils.tool_parameter_converter import ToolParameterConverter


class ToolProviderController(BaseModel, ABC):
    identity: Optional[ToolProviderIdentity] = None
    tools: Optional[list[Tool]] = None
    credentials_schema: Optional[dict[str, ToolProviderCredentials]] = None

    def get_credentials_schema(self) -> dict[str, ToolProviderCredentials]:
        """
            returns the credentials schema of the provider

            :return: the credentials schema
        """
        return self.credentials_schema.copy()
    
    @abstractmethod
    def get_tools(self) -> list[Tool]:
        """
            returns a list of tools that the provider can provide

            :return: list of tools
        """
        pass

    @abstractmethod
    def get_tool(self, tool_name: str) -> Tool:
        """
            returns a tool that the provider can provide

            :return: tool
        """
        pass

    def get_parameters(self, tool_name: str) -> list[ToolParameter]:
        """
            returns the parameters of the tool

            :param tool_name: the name of the tool, defined in `get_tools`
            :return: list of parameters
        """
        tool = next(filter(lambda x: x.identity.name == tool_name, self.get_tools()), None)
        if tool is None:
            raise ToolNotFoundError(f'tool {tool_name} not found')
        return tool.parameters

    @property
    def provider_type(self) -> ToolProviderType:
        """
            returns the type of the provider

            :return: type of the provider
        """
        return ToolProviderType.BUILT_IN

    def validate_parameters(self, tool_id: int, tool_name: str, tool_parameters: dict[str, Any]) -> None:
        """
            validate the parameters of the tool and set the default value if needed

            :param tool_name: the name of the tool, defined in `get_tools`
            :param tool_parameters: the parameters of the tool
        """
        tool_parameters_schema = self.get_parameters(tool_name)
        
        tool_parameters_need_to_validate: dict[str, ToolParameter] = {}
        for parameter in tool_parameters_schema:
            tool_parameters_need_to_validate[parameter.name] = parameter

        for parameter in tool_parameters:
            if parameter not in tool_parameters_need_to_validate:
                raise ToolParameterValidationError(f'parameter {parameter} not found in tool {tool_name}')
            
            # check type
            parameter_schema = tool_parameters_need_to_validate[parameter]
            if parameter_schema.type == ToolParameter.ToolParameterType.STRING:
                if not isinstance(tool_parameters[parameter], str):
                    raise ToolParameterValidationError(f'parameter {parameter} should be string')
            
            elif parameter_schema.type == ToolParameter.ToolParameterType.NUMBER:
                if not isinstance(tool_parameters[parameter], int | float):
                    raise ToolParameterValidationError(f'parameter {parameter} should be number')
                
                if parameter_schema.min is not None and tool_parameters[parameter] < parameter_schema.min:
                    raise ToolParameterValidationError(f'parameter {parameter} should be greater than {parameter_schema.min}')
                
                if parameter_schema.max is not None and tool_parameters[parameter] > parameter_schema.max:
                    raise ToolParameterValidationError(f'parameter {parameter} should be less than {parameter_schema.max}')
                
            elif parameter_schema.type == ToolParameter.ToolParameterType.BOOLEAN:
                if not isinstance(tool_parameters[parameter], bool):
                    raise ToolParameterValidationError(f'parameter {parameter} should be boolean')
                
            elif parameter_schema.type == ToolParameter.ToolParameterType.SELECT:
                if not isinstance(tool_parameters[parameter], str):
                    raise ToolParameterValidationError(f'parameter {parameter} should be string')
                
                options = parameter_schema.options
                if not isinstance(options, list):
                    raise ToolParameterValidationError(f'parameter {parameter} options should be list')
                
                if tool_parameters[parameter] not in [x.value for x in options]:
                    raise ToolParameterValidationError(f'parameter {parameter} should be one of {options}')
                
            tool_parameters_need_to_validate.pop(parameter)

        for parameter in tool_parameters_need_to_validate:
            parameter_schema = tool_parameters_need_to_validate[parameter]
            if parameter_schema.required:
                raise ToolParameterValidationError(f'parameter {parameter} is required')
            
            # the parameter is not set currently, set the default value if needed
            if parameter_schema.default is not None:
                tool_parameters[parameter] = ToolParameterConverter.cast_parameter_by_type(parameter_schema.default,
                                                                                           parameter_schema.type)

    def validate_credentials_format(self, credentials: dict[str, Any]) -> None:
        """
            validate the format of the credentials of the provider and set the default value if needed

            :param credentials: the credentials of the tool
        """
        credentials_schema = self.credentials_schema
        if credentials_schema is None:
            return
        
        credentials_need_to_validate: dict[str, ToolProviderCredentials] = {}
        for credential_name in credentials_schema:
            credentials_need_to_validate[credential_name] = credentials_schema[credential_name]

        for credential_name in credentials:
            if credential_name not in credentials_need_to_validate:
                raise ToolProviderCredentialValidationError(f'credential {credential_name} not found in provider {self.identity.name}')
            
            # check type
            credential_schema = credentials_need_to_validate[credential_name]
            if credential_schema == ToolProviderCredentials.CredentialsType.SECRET_INPUT or \
                credential_schema == ToolProviderCredentials.CredentialsType.TEXT_INPUT:
                if not isinstance(credentials[credential_name], str):
                    raise ToolProviderCredentialValidationError(f'credential {credential_name} should be string')
            
            elif credential_schema.type == ToolProviderCredentials.CredentialsType.SELECT:
                if not isinstance(credentials[credential_name], str):
                    raise ToolProviderCredentialValidationError(f'credential {credential_name} should be string')
                
                options = credential_schema.options
                if not isinstance(options, list):
                    raise ToolProviderCredentialValidationError(f'credential {credential_name} options should be list')
                
                if credentials[credential_name] not in [x.value for x in options]:
                    raise ToolProviderCredentialValidationError(f'credential {credential_name} should be one of {options}')
                
            credentials_need_to_validate.pop(credential_name)

        for credential_name in credentials_need_to_validate:
            credential_schema = credentials_need_to_validate[credential_name]
            if credential_schema.required:
                raise ToolProviderCredentialValidationError(f'credential {credential_name} is required')
            
            # the credential is not set currently, set the default value if needed
            if credential_schema.default is not None:
                default_value = credential_schema.default
                # parse default value into the correct type
                if credential_schema.type == ToolProviderCredentials.CredentialsType.SECRET_INPUT or \
                    credential_schema.type == ToolProviderCredentials.CredentialsType.TEXT_INPUT or \
                    credential_schema.type == ToolProviderCredentials.CredentialsType.SELECT:
                    default_value = str(default_value)

                credentials[credential_name] = default_value