Path issues under Windows

[VolkerHartmann]

Describe the bug
While registering a Metadata Document with any self-provided Id, e.g. d1, I receive HTTP 400. The logfile gives me the following stacktrace:

java.nio.file.InvalidPathException: UNC path is missing sharename: /\d1
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:118) ~[na:na]
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77) ~[na:na]
        at java.base/sun.nio.fs.WindowsPath.parse(WindowsPath.java:92) ~[na:na]
        at java.base/sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:229) ~[na:na]
        at java.base/java.nio.file.Path.of(Path.java:147) ~[na:na]
        at java.base/java.nio.file.Paths.get(Paths.java:69) ~[na:na]
        at edu.kit.datamanager.repo.service.impl.IdBasedStorageService.createPath(IdBasedStorageService.java:66) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.util.PathUtils.substitutePathPattern(PathUtils.java:92) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.util.PathUtils.getDataUri(PathUtils.java:69) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.service.impl.SimpleDataVersioningService.write(SimpleDataVersioningService.java:67) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.service.impl.ContentInformationService.create(ContentInformationService.java:156) ~[repo-core-1.0.0.jar!/:na]

The issue happens at IdBasedStorageService.java#L66 where the path is build starting with "/", whereas all other elements are added with "[part]" under Windows, which results in path /\d1for our chosen identifier.

Another issue, but also related to how to include IDs in the path occurs, if someone uses a URL as Id. Using 'http://localhost:8080/d1' results in the following stacktrace:

2022-03-17 22:07:13.935 ERROR 34812 --- [nio-8040-exec-5] e.k.d.r.s.i.ContentInformationService    : Failed to write content using versioning service simple.

java.nio.file.InvalidPathException: Illegal character [:] in path at index 7: /\http\://l\ocal\host\:804\0/d1
        at java.base/sun.nio.fs.WindowsPathParser.nextSlash(WindowsPathParser.java:212) ~[na:na]
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:116) ~[na:na]
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77) ~[na:na]
        at java.base/sun.nio.fs.WindowsPath.parse(WindowsPath.java:92) ~[na:na]
        at java.base/sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:229) ~[na:na]
        at java.base/java.nio.file.Path.of(Path.java:147) ~[na:na]
        at java.base/java.nio.file.Paths.get(Paths.java:69) ~[na:na]
        at edu.kit.datamanager.repo.service.impl.IdBasedStorageService.createPath(IdBasedStorageService.java:66) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.util.PathUtils.substitutePathPattern(PathUtils.java:92) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.util.PathUtils.getDataUri(PathUtils.java:69) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.service.impl.SimpleDataVersioningService.write(SimpleDataVersioningService.java:67) ~[repo-core-1.0.0.jar!/:na]
        at edu.kit.datamanager.repo.service.impl.ContentInformationService.create(ContentInformationService.java:156) ~[repo-core-1.0.0.jar!/:na]

[VolkerHartmann]

Possible solution:
We should remove all characters from ID except a-z, A-Z and 0-9.
Challenges:

1. There may be 2 different IDs with the same id: e.g.: my_special_id <-> my-special-id
2. There may be an ID without any valid character: e.g.: Ü_ä