Second, simplyfied Download-Link without authentication

[wellemut]

We have a nicely working download for registered Pilots, which we need and use for map creation https://blog.vonmorgen.org/export-import/ (The existing system should remain, this is an additional feature without authentication)

Problem

Registering on Kartevonmorgen.org is not very simple. (you have to confirm your mailadress and basically subscribe to an area and then waiting to get granted as Scout-Role)
But Having a static list-view of entries is often helpful

• to know, how many entries where mapped (could be solved by this too Count of entries in a specific bbox #313)
• to check, if all of them are correct and in place...
  Checking entries on the map is rather annoying because with each map-movement, the left result bar gets re-rendered and the sorting logic changes.

Solution

Frontend

• Make the download easier, via a simple download-button in the sharing-menu
  • The download-link will be generated in the frontend, based on the structure: https://kartevonmorgen.org/api/v0/export/entries.csv?bbox=46.37725420510028,5.537109375000001,54.92714186454645,17.270507812500004&tags=eineweltnrw
  • bbox, tags and search-inputs comes directly from the frontend, so the list contains the same content as the map
    

Backend

• Therefore it is needed to have a Download avaliable without registration.
  • The same for ics-feeds: Offer Ical-Export for any filtered view #370
• To protect the content of misuse, the fields of contact_email, contact_phone and created_by needs to be blank OR filled by "This is not allowed without auth" if there would be an email-adress or a phone-number.
  • The rest of the data is not sensitive and can be just provided.
• The license of the downloaded data should always be "CC BY-SA 4.0 or ODbL" (user can choose, what they prefer) instead of CC0-1.0.
• To protect our server, you should include a protection of brute-force attacs by downloading too often.
  • I think 1 download per minut per IP should be sufficient.
  • Or a limit of 10 downloads per day per IP is also fine
  • And this download-function could be build that it stops running as soon as our server gets too much traffic.

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Similar Issues:

#235
#303