tweak nessus agent download recipe

Tenable/Nessus-Agent-Win64.download.recipe.yaml

@@ -4,20 +4,34 @@ Description: Downloads the latest Nessus Windows 64bit agent
 Identifier: com.github.jgstew.download.Nessus-Agent-Win64
 Input:
   NAME: Nessus-Agent-Win64
-MinimumVersion: '2.3'
+MinimumVersion: "2.3"
 Process:
   - Processor: com.github.jgstew.SharedProcessors/URLTextSearcher
     Arguments:
       url: https://www.tenable.com/downloads/nessus-agents?loginAttempted=true
       re_pattern: '"id":(?P<id>\d+),"file":"NessusAgent-(?P<version>\d+\.\d+\.\d+)\-x64.msi"'
+
   - Processor: URLDownloaderPython
     Arguments:
       url: https://www.tenable.com/downloads/api/v1/public/pages/nessus-agents/downloads/%id%/download?i_agree_to_tenable_license_agreement=true
       # NOTE: the filename isn't in the url tail
-      prefetch_filename: True
+      filename: Nessus-x64.msi
       # NOTE: `www.tenable.com/downloads` doesn't seem to provide etag or last modified header info so we can't be smart about this
       COMPUTE_HASHES: True
       User_Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0
       CHECK_FILESIZE_ONLY: True
       download_version: "%version%"
+
   - Processor: EndOfCheckPhase
+
+  # get SourceReleaseDate from HTTP `Last-Modified` header:
+  - Processor: com.github.jgstew.SharedProcessors/DateTimeFromString
+    Arguments:
+      # parse last_modified header info from URLDownloaderPython
+      datetime_string: "%last_modified%"
+      datetime_strptime: "%a, %d %b %Y %H:%M:%S %Z"
+      datetime_strftime: "%Y-%m-%d"
+      datetime_parsed_name: SourceReleaseDate
+
+  # get version from MSI:
+  - Processor: com.github.jgstew.SharedProcessors/FileMsiGetProperty