CGI implement custom response format

examples/cgi_debug.cgi

@@ -6,4 +6,5 @@ server.
 """
 import cgi
 
+print("200 text/html")
 cgi.test()

jetforce.py

@@ -204,7 +204,7 @@ class StaticDirectoryApplication(JetforceApplication):
         self,
         root_directory: str = "/var/gemini",
         index_file: str = "index.gmi",
-        cgi_directory: str = "cgi-bin/",
+        cgi_directory: str = "/cgi-bin",
     ):
         super().__init__()
         self.routes.append((RoutePattern(), self.serve_static_file))
@@ -218,7 +218,10 @@ class StaticDirectoryApplication(JetforceApplication):
         self.mimetypes.add_type("text/gemini", ".gemini")
 
     def serve_static_file(self, request: Request):
-
+        """
+        Convert a URL into a filesystem path, and attempt to serve the file
+        or directory that is represented at that path.
+        """
         url_path = pathlib.Path(request.path.strip("/"))
 
         filename = pathlib.Path(os.path.normpath(str(url_path)))
@@ -229,19 +232,26 @@ class StaticDirectoryApplication(JetforceApplication):
         filesystem_path = self.root / filename
 
         if filesystem_path.is_file():
-            if str(filename).startswith(self.cgi_directory):
-                if os.access(filesystem_path, os.X_OK):
-                    return self.run_cgi_script(filesystem_path, request.environ)
-            mimetype = self.guess_mimetype(filesystem_path.name)
-            generator = self.load_file(filesystem_path)
-            return Response(Status.SUCCESS, mimetype, generator)
+            is_cgi = str(filename).startswith(self.cgi_directory)
+            is_exe = os.access(filesystem_path, os.X_OK)
+            if is_cgi and is_exe:
+                return self.run_cgi_script(filesystem_path, request.environ)
+
+            else:
+                mimetype = self.guess_mimetype(filesystem_path.name)
+                generator = self.load_file(filesystem_path)
+                return Response(Status.SUCCESS, mimetype, generator)
+
         elif filesystem_path.is_dir():
             index_file = filesystem_path / self.index_file
             if index_file.exists():
                 generator = self.load_file(index_file)
+                return Response(Status.SUCCESS, "text/gemini", generator)
+
             else:
                 generator = self.list_directory(url_path, filesystem_path)
-            return Response(Status.SUCCESS, "text/gemini", generator)
+                return Response(Status.SUCCESS, "text/gemini", generator)
+
         else:
             return Response(Status.NOT_FOUND, "Not Found")
 
@@ -260,22 +270,21 @@ class StaticDirectoryApplication(JetforceApplication):
             errors="surrogateescape",
         )
 
-        # Try to get the mimetype from the CGI response's content-type.
-        # Discard all other response headers for now.
-        mimetype = "text/plain"
-        for line in out.stdout:
-            header = line.lower().strip()
-            if header.startswith("content-type:"):
-                mimetype = header.split(":", maxsplit=1)[1]
-            elif not header:
-                # A empty line signals the end of the headers
-                break
+        status_line = out.stdout.readline().strip()
+        status_parts = status_line.split(maxsplit=1)
+        if len(status_parts) != 2 or not status_parts[0].isdecimal():
+            return Response(Status.CGI_ERROR, "Script generated invalid response")
+
+        status, meta = status_parts
 
         # Re-encode the rest of the body as bytes
         body = codecs.iterencode(out.stdout, encoding="utf-8", errors="surrogateescape")
-        return Response(Status.SUCCESS, mimetype, body)
+        return Response(int(status), meta, body)
 
     def load_file(self, filesystem_path: pathlib.Path):
+        """
+        Load a file using a generator to allow streaming data to the TCP socket.
+        """
         with filesystem_path.open("rb") as fp:
             data = fp.read(1024)
             while data:
@@ -300,6 +309,9 @@ class StaticDirectoryApplication(JetforceApplication):
                 yield f"=>/{url_path / file.name}\t{file.name}\r\n".encode()
 
     def guess_mimetype(self, filename: str):
+        """
+        Guess the mimetype of a file based on the file extension.
+        """
         mime, encoding = self.mimetypes.guess_type(filename)
         if encoding:
             return f"{mime}; charset={encoding}"
@@ -578,8 +590,8 @@ def run_server() -> None:
     )
     parser.add_argument(
         "--cgi-dir",
-        help="CGI script folder, relative to the root path",
-        default="cgi-bin/",
+        help="CGI script folder, relative to the server's root directory",
+        default="/cgi-bin",
     )
     parser.add_argument(
         "--index-file", help="The gemini directory index file", default="index.gmi"