support python function(call from snap!)

extensions_v3/extension_python.py

@@ -1,16 +1,12 @@
-'''
-当前插件只允许运行表达式
-如果你希望执行任意python代码，请使用: https://github.com/CodeLabClub/codelab_adapter_extensions/blob/master/extensions_v2/extension_python_kernel_exec.py，注意风险
-安全性原则: 打开这个插件前，提醒社区用户确认积木中没有危险的Python代码， 允许社区成员举报危险代码
-也可以在Scratch EIM插件中运行Python代码
-'''
-
+import sys
 import time
 import webbrowser
 import requests
+from io import StringIO
+import contextlib
 from codelab_adapter.core_extension import Extension
 from codelab_adapter.utils import verify_token, open_path_in_system_file_manager
-
+from codelab_adapter.config import settings
 
 class PyHelper:
     def open_url(self, url, **kwargs):
@@ -28,14 +24,47 @@ class PythonKernelExtension(Extension):
     NODE_ID = "eim/extension_python"
     HELP_URL = "http://adapter.codelab.club/extension_guide/extension_python_kernel/"
     WEIGHT = 95
-    VERSION = "1.1"  # extension version
-    DESCRIPTION = "Python eval"
+    VERSION = "1.2"  # extension version, support python function
+    DESCRIPTION = "Python eval/exec(function)"
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
         self.PyHelper = PyHelper()
+        self.error_prefix = "error: "
 
-    def run_python_code(self, code):
+    @contextlib.contextmanager
+    def stdoutIO(self, stdout=None):
+        old = sys.stdout
+        if stdout is None:
+            stdout = StringIO()
+        sys.stdout = stdout
+        yield stdout
+        sys.stdout = old
+
+    def run_python_code_with_exec(self, code):
+        # global
+        try:
+            with self.stdoutIO() as s:
+                # 'hello world'[::-1]
+                # import re; print(re.search('just4fun', 'blog.just4fun.site').span())
+                # exec(object[, globals[, locals]])
+                exec(code, globals())
+            output = s.getvalue()
+        except Exception as e:
+            # todo error begin
+            output = self.error_prefix + str(e)
+        return output
+        
+    def run_python_code_with_function_eval(self, code):
+        try:
+            # eval(expression, globals=None, locals=None)
+            output = eval(code, globals())
+        except Exception as e:
+            # todo error begin
+            output = self.error_prefix + str(e)
+        return output
+    
+    def run_python_code_old(self, code):
         try:
             # eval(expression, globals=None, locals=None)
             output = eval(code, {"__builtins__": None}, {
@@ -43,18 +72,36 @@ class PythonKernelExtension(Extension):
                 "requests": requests,
             })
         except Exception as e:
-            output = str(e)
+            output = self.error_prefix + str(e)
         return output
 
     # @verify_token
     def extension_message_handle(self, topic, payload):
         self.logger.info(f'python code: {payload["content"]}')
-        python_code = payload["content"]
-        output = self.run_python_code(python_code)
+        content = payload["content"] # eval/exec
+        
+        if (len(payload["content"]) > 5) and (content[0:4] in ['exec', 'eval']):
+            # cheak token
+            if payload["token"] != settings.token:
+                output = self.error_prefix + "token is invalid"
+            else:
+                run_with = content[0:4]
+                python_code = content[5:]
+
+                if run_with == 'eval':
+                    output = self.run_python_code_with_function_eval(python_code)
+                if run_with == 'exec':
+                    # todo create function(from client) 4 space
+                    # verify_token
+                    output = self.run_python_code_with_exec(python_code)
+        else:
+            # old eval
+            python_code = content
+            output = self.run_python_code_old(python_code)
         try:
             output = str(output)  # 不要传递复杂结构
         except Exception as e:
-            output = str(e)
+            output = self.error_prefix + str(e)
         payload["content"] = output
         message = {"payload": payload}
         self.publish(message)