[C++] S3 FileSystemFromUri with special char in secret key fails

[asfimport]

S3 Secret access keys can contain special characters like /. When they do

1. FileSystemFromUri will fail to parse the URI unless you URL-encode them (e.g. replace / with %2F)
2. When you do escape the special characters, requests that require authorization fail with the message "The request signature we calculated does not match the signature you provided. Check your key and signing method." This may suggest that there's some extra URL encoding/decoding that needs to happen inside.

I was only able to work around this by generating a new access key that happened not to have special characters.

Reporter: Neal Richardson / @nealrichardson
Assignee: Antoine Pitrou / @pitrou

PRs and other links:

• GitHub Pull Request #8185

_{Note: This issue was originally created as ARROW-9859. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
@nealrichardson Is there a test bucket with those characteristics?

[asfimport]

Antoine Pitrou / @pitrou:
Nevermind, I have such a test bucket myself :-)

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 8185
#8185