✨ add error handling for wrong credentials

Unfortunately, the taz website does not respond with an http error code if the credentials are wrong. So we have to check if the response is a pdf file or the html page with an error message.

models.py

@@ -1,11 +1,11 @@
 import os
 import requests
 from requests.exceptions import HTTPError
-from exceptions import TazDownloadFormatException
-from exceptions import TazDownloadError
+from exceptions import TazDownloadFormatException, TazConfigurationError, TazDownloadError
 from bs4 import BeautifulSoup
 from envyaml import EnvYAML
 import argparse
+import filetype
 
 dir_path = os.path.dirname(os.path.realpath(__file__))
 
@@ -170,8 +170,22 @@ class TazDownloader:
                 with open(os.path.join(download_folder, taz), "wb") as f:
                     for chunk in r.iter_content(chunk_size=8192):
                         f.write(chunk)
+                # Unfortunately, the taz website does not respond with an http error code if the credentials are wrong.
+                # So we have to check if the response is a pdf file or the html page with an error message.
+                try:
+                    if filetype.guess(os.path.join(download_folder, taz)).mime != 'application/pdf':
+                        raise TazDownloadError()
+                except (AttributeError, TazDownloadError) as e:
+                    # Try to get the error message from the html file to put it in the log
+                    with open(os.path.join(download_folder, taz), 'r') as f:
+                        soup = BeautifulSoup(f.read(), 'html.parser')
+                        error_displayed_on_page = soup.find('p', class_='error').text
+                    if error_displayed_on_page:
+                        os.remove(os.path.join(download_folder, taz))
+                        raise TazDownloadError(error_displayed_on_page)
+                    else:
+                        os.remove(os.path.join(download_folder, taz))
+                        raise TazDownloadError(e)
             return True
         except HTTPError as http_e:
-            raise TazDownloadError(f"Could not download taz:\n{http_e}")
-        except Exception as e:
-            raise TazDownloadError(f"Something went wrong:\n{e}")
+            raise TazDownloadError(http_e)