Materials/index.html can not render a file of which Path has length longer than 255 characters

[kazurayam]

In my application,
MaterialRepository#resolveScreenshotPathByURLPathCompoents(String, String,URL, int, String) produced a screenshot file of which Path has length longer than 255 characters which is the limit of Windows File System. For example I have

• Materials/HP.base.chronos.chronos_capture/HP_byサービス名_本番環境_category1 - SMBC/20200630_100308/HP.processHpAUTConfig/SMBC/smbc_nikko%2Fqsearch.exe%3FF%3Dusers%2Fsmbc-nikko%2Fkensaku%26KEY1%3D%26KEY2%3D%26KEY3%3D%26KEY4%3D%26GO_BEFORE%3D%26BEFORE%3D.png

Browsers can not render those too-long path files appropriately. Long Paths causes annoying problems.

Materials should silently generate Path less than the limit silently in order to avoid miscellenious problems.

[kazurayam]

A reading about 255 characters limit

https://www.myworkdrive.com/support/troubleshooting-windows-file-paths-longer-255-characters/

[kazurayam]

The following orignal path string has 257 characters.

Materials/HP.base.chronos.chronos_capture/HP_byサービス名_本番環境_category1 - SMBC日興証券/20200630_100308/HP.processHpAUTConfig/SMBC日興証券/smbc_nikko%2Fqsearch.exe%3FF%3Dusers%2Fsmbc-nikko%2Fkensaku%26KEY1%3D%26KEY2%3D%26KEY3%3D%26KEY4%3D%26GO_BEFORE%3D%26BEFORE%3D.png

I want to make it more compact.

Let me try removing all '%aa' escaped sequences.

I got a string:

Materials/HP.base.chronos.chronos_capture/HP_byサービス名_本番環境_category1 - SMBC日興証券/20200630_100308/HP.processHpAUTConfig/SMBC日興証券/smbc_nikkoqsearch.exeFuserssmbc-nikkokensakuKEY1KEY2KEY3KEY4GO_BEFOREBEFORE.png

This string has only 206 characters length. This is far less than the limit of 255.
And this string preserves information to identify the file from others.

[kazurayam]

OK, then. I will implment this compaction rule.

1. file name will be compacted. parent directories will be left unchanged.
2. if the length of Absolute path exceed the 255, then the compaction rule will be applied.
3. In the file name, character strings of '%nn' will be removed.
4. if the length of Absolute path still exceeds the 255, then the file name will be chomped to form a path name less than 255.
5. if the URL contains many queries, then filtering '&' and '=" will shorten the path. But it may not be enough; not guaranteed at all.

[kazurayam]

I made a tentative solution to this problem.

The real fix will require a complete redesigning as #29.

[kazurayam]

Windows 10 (rev 1607 or newer) allows LongPathsEnabled

https://knowledge.autodesk.com/ja/search-result/caas/sfdcarticles/sfdcarticles/JPN/The-Windows-10-default-path-length-limitation-MAX-PATH-is-256-characters.html#:~:text=Windows%E3%81%AE%E6%97%A2%E5%AE%9A%E3%81%A7%E3%81%AF%E3%80%81%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB,%E3%81%8C%E4%BD%BF%E7%94%A8%E3%81%95%E3%82%8C%E3%81%A6%E3%81%84%E3%81%BE%E3%81%99%E3%80%82

[kazurayam]

30th Jun I made a cosmetical chage:

if the URL contains many queries, then filtering '&' and '=" will shorten the path. But it may not be enough; not guaranteed at all.

This change was meaningless. Windows' LogPathsEnabled is enough.

So I should bring this change back.

[kazurayam]

done