Using the Nexus3 API how do I get a list of artifacts in a repository
Solution 1:
One of our internal team members put this together. It doesn't use the blobStore but accomplishes I believe what you are trying to do (and a bit more): https://gist.github.com/kellyrob99/2d1483828c5de0e41732327ded3ab224
For some background, think of a blobStore as just where we store the bits, with no information about them. OrientDB has Component/Asset records and stores all the info about them. You'll generally want to use that instead of the blobStore for Asset information as a result.
Solution 2:
Once your migration is done, it can be worth to investigate to update your version of Nexus.
That way, you will be able to use the - still in beta - new API for Nexus. It's available by default on the version 3.3.0 and more: http://localhost:8082/swagger-ui/
Basically, you retrieve the json output from this URL: http://localhost:8082/service/siesta/rest/beta/assets?repositoryId=YOURREPO
Only 10 records will be displayed at a time and you will have to use the continuationToken provided to request the next 10 records for your repository by calling: http://localhost:8082/service/siesta/rest/beta/assets?continuationToken=46525652a978be9a87aa345bdb627d12&repositoryId=YOURREPO
More information here: http://blog.sonatype.com/nexus-repository-new-beta-rest-api-for-content