Don't preview URLs to blocked hosts

What does this PR do?

Reject calls to /url (the URL preview endpoint) if the requested URL points to a blocked host.

Contribution Guidelines By submitting this merge request, you agree to follow our Contribution Guidelines

• I agree to follow this project's Contribution Guidelines
• I have made sure to test this pull request

added enhancement label

requested review from @puppygirlhornypost, @julia, @luna, and @dakkar

this will work nicely with my idea of getting the frontend to show links-to-AP-notes as quotes! (essentially: if the url preview says "activitypub", call ap/show and then patch the quote value in the note object in the frontend)

approved this merge request

resolved all threads

resolved all threads

approved this merge request

added 59 commits

• 22965213...27339e03 - 4 commits from branch TransFem-org:develop
• 27339e03...8613af76 - 45 earlier commits
• 1d92e2ac - remove `idea` section
• 0c8c0f90 - Update report-abuse.ts
• 94c0a37a - check harder for connectibility
• b81f3e9b - Change example config - db name and user consistent with docs
• a5896827 - Update file Dockerfile
• 93674389 - creat and chown /sharkey/files in dockerfile
• 28f9e62a - edit query
• 9d6095a2 - fix lint errors in UrlPreviewService
• 0aca29b3 - verify that preview URL is valid
• b5c35ff6 - don't generate URL previews for blocked domains

Compare with previous version

reset approvals from @dakkar and @tess by pushing to the branch

added 32 commits

• b5c35ff6...41536480 - 29 commits from branch TransFem-org:develop
• c48faca7 - fix lint errors in UrlPreviewService
• 4c6cec55 - verify that preview URL is valid
• 2a4c432f - don't generate URL previews for blocked domains

Compare with previous version

enabled an automatic merge when all merge checks for 2a4c432f pass

approved this merge request

approved this merge request

mentioned in commit fadcabea

merged

added federation label