From eb33597bcddc51633ff9630508b2095667e34bbb Mon Sep 17 00:00:00 2001
From: Roimar Rafael Urbano <urbanoprogramador@gmail.com>
Date: Wed, 18 Dec 2024 19:23:42 -0500
Subject: [PATCH 1/2] The error 'Parse Error: Invalid character in chunk size'
 occurs because both response.content_length and 'Transfer-Encoding':
 'chunked' are being set in the server response. This creates a conflict, as
 Transfer-Encoding: chunked does not require a Content-Length. By removing
 response.content_length = len(image_data), this conflict is avoided, and the
 error is resolved.

---
 navigator/actions/zammad.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/navigator/actions/zammad.py b/navigator/actions/zammad.py
index 83c2311..03ed389 100644
--- a/navigator/actions/zammad.py
+++ b/navigator/actions/zammad.py
@@ -441,7 +441,6 @@ async def get_attachment_img(self, attachment: str, request: Request):
                     'Expires': expiring_date.strftime('%a, %d %b %Y %H:%M:%S GMT'),
                 }
             )
-            response.content_length = len(image_data)
             await response.prepare(request)
             await response.write(image_data)
             await response.write_eof()

From 9fff4c02374ad032d585164493a9b6ad548ec3b9 Mon Sep 17 00:00:00 2001
From: Roimar Rafael Urbano <urbanoprogramador@gmail.com>
Date: Wed, 18 Dec 2024 20:58:22 -0500
Subject: [PATCH 2/2] Added file scaling system with Transfer-Encoding: chunked
 and resolved the conflict by removing the use of content_length in the
 response.

---
 navigator/actions/zammad.py | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/navigator/actions/zammad.py b/navigator/actions/zammad.py
index 03ed389..10809b4 100644
--- a/navigator/actions/zammad.py
+++ b/navigator/actions/zammad.py
@@ -427,6 +427,8 @@ async def get_attachment_img(self, attachment: str, request: Request):
                 image_data = image  # Ya es un objeto binario válido
 
             expiring_date = datetime.now() + timedelta(days=2)
+            chunk_size = 16384
+            content_length = len(image_data)
             # Crear y devolver la respuesta HTTP
             response = StreamResponse(
                 status=200,
@@ -441,11 +443,24 @@ async def get_attachment_img(self, attachment: str, request: Request):
                     'Expires': expiring_date.strftime('%a, %d %b %Y %H:%M:%S GMT'),
                 }
             )
-            await response.prepare(request)
-            await response.write(image_data)
-            await response.write_eof()
-            return response
+            response.headers[
+                "Content-Range"
+            ] = f"bytes 0-{chunk_size}/{content_length}"
+            try:
+                i = 0
+                await response.prepare(request)
+                while True:
+                    chunk = image_data[i: i + chunk_size]
+                    i += chunk_size
+                    if not chunk:
+                        break
+                    await response.write(chunk)
+                    await response.drain()  # deprecated
+                await response.write_eof()
+                return response
+            except Exception as e:
+                raise ConfigError(f"Error while writing attachment: {e}") from e
         except KeyError as e:
             raise ConfigError(f"Missing required header: {e}") from e
         except Exception as e:
-            raise ConfigError(f"Unexpected error while fetching attachment: {e}") from e
+            raise ConfigError(f"Unexpected error while fetching attachment: {e}") from e
\ No newline at end of file