PUT on `/notifications` endpoint with invalid date causes internal server error

[matusf]

• Gitea version (or commit ref): Gitea version 1.13.7 built with GNU Make 4.1, go1.15.11 : bindata, sqlite, sqlite_unlock_notify
• Git version: git version 2.17.
• Operating system: Ubuntu 18.04
• Downloaded gitea from downloads page
• Running as a command-line program
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
• Log gist:

2021/04/08 18:14:24 Completed PUT /api/v1/notifications?last_read_at=xxx 500 Internal Server Error in 35.807758ms

Description

Make PUT request on /notifications endpoint with supplied authorization token and invalid date in query parameters. Then 500 response is returned with following response body:

curl -X PUT 'http://localhost:3000/api/v1/notifications?last_read_at=xxx' -H "Authorization: token $TOKEN"
{"message":"","url":"http://localhost:3000/api/swagger"}

[6543]

I think we should return a 400 with an error description

[zeripath]

I mean a 500 here is not entirely inappropriate, from MDN:

500 Internal Server Error
The server has encountered a situation it doesn't know how to handle.

I think 422 is really supposed to be emitted by WebDAV servers - I'm not sure how many other services use it.

400: Bad Request is probably the better supported option.

[6543]

shuld be solve by #16177