fix: workaround magic false positives (ietf-tools#9207)

* fix: workaround magic false positives

* chore: ruff

Author: rjsparks

ietf/utils/mime.py

@@ -5,6 +5,7 @@
 import magic
 import re
 
+
 def get_mime_type(content):
     # try to fixup encoding
     if hasattr(magic, "open"):
@@ -13,15 +14,17 @@ def get_mime_type(content):
         filetype = m.buffer(content)
     else:
         m = magic.Magic()
-        m.cookie = magic.magic_open(magic.MAGIC_NONE | magic.MAGIC_MIME | magic.MAGIC_MIME_ENCODING)
+        m.cookie = magic.magic_open(
+            magic.MAGIC_NONE | magic.MAGIC_MIME | magic.MAGIC_MIME_ENCODING
+        )
         magic.magic_load(m.cookie, None)
         filetype = m.from_buffer(content)
     # Work around silliness in libmagic on OpenSUSE 15.1
-    filetype = filetype.replace('text/x-Algol68;', 'text/plain;')
-    if ';' in filetype and 'charset=' in filetype:
-        mimetype, charset = re.split('; *charset=', filetype)
+    filetype = filetype.replace("text/x-Algol68;", "text/plain;")
+    filetype = filetype.replace("application/vnd.hp-HPGL;", "text/plain;")
+    if ";" in filetype and "charset=" in filetype:
+        mimetype, charset = re.split("; *charset=", filetype)
     else:
-        mimetype = re.split(';', filetype)[0]
-        charset = 'utf-8'
+        mimetype = re.split(";", filetype)[0]
+        charset = "utf-8"
     return mimetype, charset
-