Only show the play online button when a URL has a valid file extension

[curiousdannii]

Discussion: https://intfiction.org/t/how-do-you-prevent-ifdbs-play-on-line-button-to-z-code-games-hosted-on-itch-io/60960

It's quite common to put, for example, an itch URL as the download location for a Z-Code or Glulx game. But they don't have direct download links, so you can only link to the game's page. IFDB should exclude URLs that don't have a valid storyfile extension from being considered for the play online button because Parchment won't play them anyway.

[erkyrath]

Storyfile extensions aren't entirely consistent, but this is still a good idea.

(Include dat, zlb, glb as acceptable extensions.)

(What about zip? Someone building original ZIL source with Infocom's toolchain might wind up with a story file called game.zip. We won't have any of those on ifarchive.org, I hope, so at least it won't confuse Unbox...)

[dfabulich]

Discussion continues on intfiction.org, but I'm extremely skeptical of this. My general thinking is that we want the user editing the link to be in control of whether the "Play On-line" button appears, based on whether the "playable game" box is checked or not.

[curiousdannii]

Being able to control it would be great. But this would be a quicker immediate solution.

Parchment doesn't support .dat at present. Are there any .dat Z-code files in IFDB?

[dfabulich]

To be clear, my claim is that editing users can already control this with the "playable game" checkbox.

IFDB has only 25 .dat links. The vast majority of them are Alan 2 games, and none of any major importance.

list of `.dat` files in IFDB

``` MariaDB [ifdb]> select gameid, games.title, system, numRatingsInAvg, starsort, url from gamelinks l join games on gameid = games.id join gameRatingsSandbox0 using (gameid) where lower(url) like '%.dat' order by starsort desc \G *************************** 1. row *************************** gameid: zpjzp8drlwozs0j0 title: The Chasing system: Alan 2 numRatingsInAvg: 8 starsort: 3.1099638722346996 url: http://www.ifarchive.org/if-archive/games/competition2001/alan/chasing/chasing.dat *************************** 2. row *************************** gameid: xtjl0qi2ek8gxdoi title: On the Farm system: TADS 2 numRatingsInAvg: 14 starsort: 2.8400452314290647 url: http://www.ifarchive.org/if-archive/games/competition99/tads/otf/trcolor.dat *************************** 3. row *************************** gameid: v5xsbaedcb9p29bq title: Busted! system: AdvSys, Inform 5 numRatingsInAvg: 4 starsort: 2.788531170056884 url: http://www.ifarchive.org/if-archive/games/advsys/busted.dat *************************** 4. row *************************** gameid: sjcl3dxizsq4nxkv title: The HeBGB Horror! system: Alan 2 numRatingsInAvg: 6 starsort: 2.691920231427209 url: http://www.ifarchive.org/if-archive/games/competition99/alan/hebgb/hebgb.dat *************************** 5. row *************************** gameid: 4x0u04kk511t2s0w title: The Land Beyond the Picket Fence system: Pascal numRatingsInAvg: 2 starsort: 2.612033189389102 url: http://www.ifarchive.org/if-archive/games/competition96/picket/picket.dat *************************** 6. row *************************** gameid: s4yn55ghi2vfc8lt title: The Isolato Incident system: Alan 2 numRatingsInAvg: 3 starsort: 2.5905731655445012 url: http://www.ifarchive.org/if-archive/games/competition2001/alan/isolato/isolato.dat *************************** 7. row *************************** gameid: f7u68nd9cquz72br title: Sardoria system: Alan 2 numRatingsInAvg: 6 starsort: 2.57491490281072 url: http://www.ifarchive.org/if-archive/games/competition2003/alan/sardoria/sardoria.dat *************************** 8. row *************************** gameid: cago048gdg3n9ssu title: The Adventures of the President of the United States system: Alan 2 numRatingsInAvg: 10 starsort: 2.5217510200506346 url: http://www.ifarchive.org/if-archive/games/competition2003/alan/apus/apus.dat *************************** 9. row *************************** gameid: s4girkccjl8mtwh4 title: Puddles on the Path system: Alan 2 numRatingsInAvg: 3 starsort: 2.483742690100144 url: http://www.ifarchive.org/if-archive/games/springthing/2003/puddles/puddles.dat *************************** 10. row *************************** gameid: xt96319ebnlsh0l2 title: Lunatix - The Insanity Circle system: QuickBASIC numRatingsInAvg: 3 starsort: 2.348352202908475 url: http://www.ifarchive.org/if-archive/games/competition99/msdos/lunatix/lunatix1.dat *************************** 11. row *************************** gameid: xt96319ebnlsh0l2 title: Lunatix - The Insanity Circle system: QuickBASIC numRatingsInAvg: 3 starsort: 2.348352202908475 url: http://www.ifarchive.org/if-archive/games/competition99/msdos/lunatix/lunatix2.dat *************************** 12. row *************************** gameid: qd5ptmk64s4l3ku2 title: Out of the Study system: Alan 2 numRatingsInAvg: 3 starsort: 2.326390320734626 url: http://www.ifarchive.org/if-archive/games/competition2002/alan/study/study.dat *************************** 13. row *************************** gameid: rt6brl1fmmjf0y7u title: Chaos system: TADS 2 numRatingsInAvg: 4 starsort: 2.3149647726886977 url: http://www.ifarchive.org/if-archive/games/competition99/tads/chaos/chaos.dat *************************** 14. row *************************** gameid: p8vmhhkmzp5qsnlr title: SNOSAE system: BASIC numRatingsInAvg: 2 starsort: 2.3027477399884244 url: http://www.ifarchive.org/if-archive/games/competition99/msdos/snosae/setup.dat *************************** 15. row *************************** gameid: 58b0tx19wzbuwlpr title: CC system: Alan 2 numRatingsInAvg: 3 starsort: 2.233742690100144 url: http://www.ifarchive.org/if-archive/games/competition98/alan/cc/cc.dat *************************** 16. row *************************** gameid: mt1zi26l1zejnsxy title: The Key to Time system: AdvSys numRatingsInAvg: 1 starsort: 2.1948824399784836 url: http://www.ifarchive.org/if-archive/games/advsys/key.dat *************************** 17. row *************************** gameid: gbum4w6lvn57h9ps title: King Arthur's Night Out system: Alan 2 numRatingsInAvg: 2 starsort: 2.1306226350972404 url: http://www.ifarchive.org/if-archive/games/competition99/alan/arthur/arthur.dat *************************** 18. row *************************** gameid: x86e78uzy380fdot title: Leaves system: Alan 2 numRatingsInAvg: 2 starsort: 2.1306226350972404 url: http://www.ifarchive.org/if-archive/games/competition97/alan/leaves/leaves.dat *************************** 19. row *************************** gameid: cbesz0xvi20n6w38 title: To Otherwhere and Back system: Alan 2 numRatingsInAvg: 1 starsort: 1.995340407336458 url: http://www.ifarchive.org/if-archive/games/competition2001/alan/toab/toab.dat *************************** 20. row *************************** gameid: erw51whzgx8217hx title: Don't Be Late system: Alan 2 numRatingsInAvg: 2 starsort: 1.9062978502050951 url: http://www.ifarchive.org/if-archive/games/competition96/dbl/dbl.dat *************************** 21. row *************************** gameid: 73syu23qk6x3qeh5 title: Zero One system: Alan 2 numRatingsInAvg: 6 starsort: 1.8159138048906276 url: http://www.ifarchive.org/if-archive/games/competition2004/alan/01/01.dat *************************** 22. row *************************** gameid: rq7505rd58zsd82x title: R (Pron: Arrr...) system: Visionary numRatingsInAvg: 11 starsort: 1.7915318825633757 url: http://ifarchive.org/if-archive/games/competition2010/windows/r/R_Game_Data_File/r.dat *************************** 23. row *************************** gameid: rwyd3yl4ax18hsck title: SURREAL system: GAGS numRatingsInAvg: 1 starsort: 1.7369969851246208 url: http://www.ifarchive.org/if-archive/games/competition2001/msdos/surreal/SURREAL.DAT *************************** 24. row *************************** gameid: 0lqt3nkfvztvgrov title: My First Stupid Game system: AGT numRatingsInAvg: 2 starsort: 1.5545194630759813 url: http://www.ifarchive.org/if-archive/games/competition96/first/source/first.dat *************************** 25. row *************************** gameid: i5z59kqmokg226d1 title: Rape, Pillage, Galore! system: NULL numRatingsInAvg: 5 starsort: 1.5400000000000005 url: http://www.ifarchive.org/if-archive/games/competition2003/windows/pig-rpg/pig-rpg.dat 25 rows in set (0.174 sec) ```

[curiousdannii]

What would be the downside to doing this as an extra safety check? And the lack of a play online button might alert editors to the fact that they need a specific url for a storyfile for online play to work.