feat: Expose important library versions (#7713)

* feat: Expose important library versions

Update `/api/version` to include

```
"other": {
    "xml2rfc": "<version>",
    "weasyprint": "<version>"
},
```

Fixes #3415

* fix: Use importlib

* chore: Reomve additional newline

* fix: Expose libraries that are important for document submission

* fix: Rename IMPORTANT_LIBRARIES as ADVERTISE_VERSIONS

ietf/api/tests.py

@@ -936,6 +936,8 @@ class CustomApiTests(TestCase):
         r = self.client.get(url)
         data = r.json()
         self.assertEqual(data['version'], ietf.__version__+ietf.__patch__)
+        for lib in settings.ADVERTISE_VERSIONS:
+            self.assertIn(lib, data['other'])
         self.assertEqual(data['dumptime'], "2022-08-31 07:10:01 +0000")
         DumpInfo.objects.update(tz='PST8PDT')
         r = self.client.get(url)

ietf/api/views.py

@@ -23,6 +23,7 @@ from django.views.decorators.csrf import csrf_exempt
 from django.views.decorators.gzip import gzip_page
 from django.views.generic.detail import DetailView
 from email.message import EmailMessage
+from importlib.metadata import version as metadata_version
 from jwcrypto.jwk import JWK
 from tastypie.exceptions import BadRequest
 from tastypie.serializers import Serializer
@@ -240,9 +241,16 @@ def version(request):
         if dumpinfo.tz != "UTC":
             dumpdate = pytz.timezone(dumpinfo.tz).localize(dumpinfo.date.replace(tzinfo=None))
     dumptime = dumpdate.strftime('%Y-%m-%d %H:%M:%S %z') if dumpinfo else None
+
+    # important libraries
+    __version_extra__ = {}
+    for lib in settings.ADVERTISE_VERSIONS:
+        __version_extra__[lib] = metadata_version(lib)
+
     return HttpResponse(
             json.dumps({
                         'version': ietf.__version__+ietf.__patch__,
+                        'other': __version_extra__,
                         'dumptime': dumptime,
                     }),
                 content_type='application/json',

ietf/settings.py

@@ -1273,6 +1273,8 @@ if "CACHES" not in locals():
 
 PUBLISH_IPR_STATES = ['posted', 'removed', 'removed_objfalse']
 
+ADVERTISE_VERSIONS = ["markdown", "pyang", "rfc2html", "xml2rfc"]
+
 # We provide a secret key only for test and development modes.  It's
 # absolutely vital that django fails to start in production mode unless a
 # secret key has been provided elsewhere, not in this file which is