feat: universal chat in explore (#649)

Co-authored-by: StyleZhang <jasonapring2015@outlook.com>

api/core/tool/provider/base.py

@@ -0,0 +1,63 @@
+import base64
+from abc import ABC, abstractmethod
+from typing import Optional
+
+from extensions.ext_database import db
+from libs import rsa
+from models.account import Tenant
+from models.tool import ToolProvider, ToolProviderName
+
+
+class BaseToolProvider(ABC):
+    def __init__(self, tenant_id: str):
+        self.tenant_id = tenant_id
+
+    @abstractmethod
+    def get_provider_name(self) -> ToolProviderName:
+        raise NotImplementedError
+
+    @abstractmethod
+    def encrypt_credentials(self, credentials: dict) -> Optional[dict]:
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_credentials(self, obfuscated: bool = False) -> Optional[dict]:
+        raise NotImplementedError
+
+    @abstractmethod
+    def credentials_to_func_kwargs(self) -> Optional[dict]:
+        raise NotImplementedError
+
+    @abstractmethod
+    def credentials_validate(self, credentials: dict):
+        raise NotImplementedError
+
+    def get_provider(self, must_enabled: bool = False) -> Optional[ToolProvider]:
+        """
+        Returns the Provider instance for the given tenant_id and tool_name.
+        """
+        query = db.session.query(ToolProvider).filter(
+            ToolProvider.tenant_id == self.tenant_id,
+            ToolProvider.tool_name == self.get_provider_name().value
+        )
+
+        if must_enabled:
+            query = query.filter(ToolProvider.is_enabled == True)
+
+        return query.first()
+
+    def encrypt_token(self, token) -> str:
+        tenant = db.session.query(Tenant).filter(Tenant.id == self.tenant_id).first()
+        encrypted_token = rsa.encrypt(token, tenant.encrypt_public_key)
+        return base64.b64encode(encrypted_token).decode()
+
+    def decrypt_token(self, token: str, obfuscated: bool = False) -> str:
+        token = rsa.decrypt(base64.b64decode(token), self.tenant_id)
+
+        if obfuscated:
+            return self._obfuscated_token(token)
+
+        return token
+
+    def _obfuscated_token(self, token: str) -> str:
+        return token[:6] + '*' * (len(token) - 8) + token[-2:]