fixing login email case sensitivity issues

capsulflask/auth.py

@@ -43,17 +43,28 @@ def login():
 	        errors.append("enter a valid email address")
 
         if len(errors) == 0:
-            token = get_model().login(email)
+            result = get_model().login(email)
+            token = result[0]
+            ignoreCaseMatches = result[1]
             if token is None:
                 errors.append("too many logins. please use one of the existing login links that have been emailed to you")
             else:
                 link = f"{current_app.config['BASE_URL']}/auth/magic/{token}"
+                
+                message = (f"Navigate to {link} to log into Capsul.\n"
+                            "\nIf you didn't request this, ignore this message.")
+
+                if len(ignoreCaseMatches) > 0:
+                  joinedMatches = " or ".join(ignoreCaseMatches)
+                  message = (f"You tried to log in as '{email}', but that account doesn't exist yet. "
+                              "If you would like to create a new account for '{email}', click here {link} "
+                              "If you meant to log in as {joinedMatches}, please return to capsul.org "
+                              "and log in again with the correct (case-sensitive) email address.")
 
                 current_app.config["FLASK_MAIL_INSTANCE"].send(
                     Message(
                         "Click This Link to Login to Capsul",
-                        body=(f"Navigate to {link} to log into Capsul.\n"
-                               "\nIf you didn't request this, ignore this message."),
+                        body=message,
                         recipients=[email]
                     )
                 )