feat: universal chat in explore (#649)

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

api/models/tool.py

@@ -0,0 +1,47 @@
+import json
+from enum import Enum
+
+from sqlalchemy.dialects.postgresql import UUID
+
+from extensions.ext_database import db
+
+
+class ToolProviderName(Enum):
+    SERPAPI = 'serpapi'
+
+    @staticmethod
+    def value_of(value):
+        for member in ToolProviderName:
+            if member.value == value:
+                return member
+        raise ValueError(f"No matching enum found for value '{value}'")
+
+
+class ToolProvider(db.Model):
+    __tablename__ = 'tool_providers'
+    __table_args__ = (
+        db.PrimaryKeyConstraint('id', name='tool_provider_pkey'),
+        db.UniqueConstraint('tenant_id', 'tool_name', name='unique_tool_provider_tool_name')
+    )
+
+    id = db.Column(UUID, server_default=db.text('uuid_generate_v4()'))
+    tenant_id = db.Column(UUID, nullable=False)
+    tool_name = db.Column(db.String(40), nullable=False)
+    encrypted_credentials = db.Column(db.Text, nullable=True)
+    is_enabled = db.Column(db.Boolean, nullable=False, server_default=db.text('false'))
+    created_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
+    updated_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
+
+    @property
+    def credentials_is_set(self):
+        """
+         Returns True if the encrypted_config is not None, indicating that the token is set.
+         """
+        return self.encrypted_credentials is not None
+
+    @property
+    def credentials(self):
+        """
+        Returns the decrypted config.
+        """
+        return json.loads(self.encrypted_credentials) if self.encrypted_credentials is not None else None