Add python_check endpoint to routers/books

Author: ascholerChemeketa

bookserver/routers/books.py

@@ -17,6 +17,8 @@
 import random
 import socket
 from typing import Optional
+import ast
+import io
 
 # Third-party imports
 # -------------------
@@ -25,6 +27,7 @@
 from fastapi.templating import Jinja2Templates
 from jinja2.exceptions import TemplateNotFound
 from pydantic import constr
+from pyflakes import (reporter, checker)
 
 # Local application imports
 # -------------------------
@@ -55,6 +58,35 @@
     tags=["books"],
 )
 
+    
+@router.post("/python_check")
+async def python_check(request: Request):
+    """
+    Takes a chunk of Python code and runs a syntax checker (currently
+    Pyflakes) on it to provide more detailed advice than is available
+    via Skulpt.
+
+    Caller must provide:
+    * ``code`` -- the Python code to check
+    """
+    code_bytes = await request.body()
+    code = code_bytes.decode("utf-8")
+
+    filename = "program.py" 
+
+    resultMessage = ""
+    try:
+        tree = ast.parse(code, filename=filename)
+        w = checker.Checker(tree, filename=filename)
+    except SyntaxError as e:
+        textOut = io.StringIO()
+        reporter = reporter.Reporter(textOut, textOut)
+        reporter.syntaxError(filename, e.args[0], e.lineno, e.offset, e.text)
+        textOut.seek(0)
+        resultMessage = textOut.read()
+
+    return resultMessage
+
 
 # Options for static asset renderers:
 #