[content-publishing] Should validate schema payload location when announcing batch files #1001
Description
Description
When posting batch announcements via Gateway, the endpoint should validate that the payload location of the schema is off-chain (ie, IPFS).
Without this validation, it is possible to upload a batch file to IPFS but announce (or, at least attempt to announce) it to an on-chain schema. (It may be that this mismatch would fail to post to the chain in the worker, but ideally this error condition should be detected at the time of user submission, rather than leaving a failed job in an indeterminate state)
Affected endpoints
/v2/content/batchAnnouncement/v3/content/batchAnnouncement