Feat/assistant app (#2086)

Co-authored-by: chenhe <guchenhe@gmail.com>
Co-authored-by: Pascal M <11357019+perzeuss@users.noreply.github.com>

api/core/tools/provider/builtin/time/_assets/icon.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16" fill="none">
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M0.666992 8.00008C0.666992 3.94999 3.95024 0.666748 8.00033 0.666748C12.0504 0.666748 15.3337 3.94999 15.3337 8.00008C15.3337 12.0502 12.0504 15.3334 8.00033 15.3334C3.95024 15.3334 0.666992 12.0502 0.666992 8.00008ZM8.66699 4.00008C8.66699 3.63189 8.36852 3.33341 8.00033 3.33341C7.63213 3.33341 7.33366 3.63189 7.33366 4.00008V8.00008C7.33366 8.2526 7.47633 8.48344 7.70218 8.59637L10.3688 9.9297C10.6982 10.0944 11.0986 9.96088 11.2633 9.63156C11.4279 9.30224 11.2945 8.90179 10.9651 8.73713L8.66699 7.58806V4.00008Z" fill="#EC4A0A"/>
+</svg>

api/core/tools/provider/builtin/time/time.py

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+from core.tools.provider.builtin_tool_provider import BuiltinToolProviderController
+from core.tools.errors import ToolProviderCredentialValidationError
+
+from core.tools.provider.builtin.time.tools.current_time import CurrentTimeTool
+
+from typing import Any, Dict
+
+class WikiPediaProvider(BuiltinToolProviderController):
+    def _validate_credentials(self, credentials: Dict[str, Any]) -> None:
+        try:
+            CurrentTimeTool().invoke(
+                user_id='',
+                tool_paramters={},
+            )
+        except Exception as e:
+            raise ToolProviderCredentialValidationError(str(e))

api/core/tools/provider/builtin/time/time.yaml

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+identity:
+  author: Dify
+  name: time
+  label:
+    en_US: CurrentTime
+    zh_Hans: 时间
+  description:
+    en_US: A tool for getting the current time.
+    zh_Hans: 一个用于获取当前时间的工具。
+  icon: icon.svg
+credentails_for_provider:

api/core/tools/provider/builtin/time/tools/current_time.py

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+from core.tools.entities.tool_entities import ToolInvokeMessage
+from core.tools.tool.builtin_tool import BuiltinTool
+
+from typing import Any, Dict, List, Union
+
+from datetime import datetime, timezone
+
+class CurrentTimeTool(BuiltinTool):
+    def _invoke(self, 
+                user_id: str,
+               tool_paramters: Dict[str, Any], 
+        ) -> Union[ToolInvokeMessage, List[ToolInvokeMessage]]:
+        """
+            invoke tools
+        """
+        return self.create_text_message(f'{datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M:%S %Z")}')
+    

api/core/tools/provider/builtin/time/tools/current_time.yaml

@@ -0,0 +1,12 @@
+identity:
+  name: current_time
+  author: Dify
+  label:
+    en_US: Current Time
+    zh_Hans: 获取当前时间
+description:
+  human:
+    en_US: A tool for getting the current time.
+    zh_Hans: 一个用于获取当前时间的工具。
+  llm: A tool for getting the current time.
+parameters: