Recently, commits were made to remove support for using rustls/ring
in lieu of OpenSSL to avoid having to add those as dependencies in
environments where OpenSSL already exists.
However, yup-oauth2 is being used in some environments where
*OpenSSL* doesn't exist. So, retaining the option to build
it with an openssl-free stack is key.
Note, the change to hyper-native-tls is fine and actually
unrelated, because this is often happening on Windows or
Mac enviornments, where the stack that will link to is
*not* necessarily OpenSSL either.
For example, the particular breakage that prompted this
CR is a build of yup-oauth2 on iOS. In that environment,
hyper-native-tls uses Apple's Security Framework,
but OpenSSL libraries are not actually present on all
devices/simulator environments. So a link against
a mix of Security Framework and rustls make sense,
there.
Also, update to a newer version of rustls/ring while we're at it.
This removes the need for the remaining C interfaces.
Building any rust library with openssl adds a bunch
of depends such as foreign types via ffi and pkgconfg.
You are also required to have a prebuilt openssl.
Cross building and keeping up to date should be easier
with a pure rust implementation.
This bumps rustls to 0.6.1 which bumps webpki-roots.
We need this because the current version of webpki 0.8.0
has been removed from crates.io.
I created the 0.6.x rustls for hyper 0.10 support.
In future we should upade to hyper 0.11 which is rusls 0.8.0+
The current Git master doesn't build with Rust 1.17 because the
version of Rustls used on master doesn't built with Rust 1.17.
* Update the base64 dependency to ensure the version with a buffer
overflow fix is used.
* Update hyper-rustls to one that uses a version of Rustls that builds
with Rust 1.17, and that uses *ring* 0.9+, to ensure there are no
problems with accidentally linking multiple versions of *ring*, to make
the build easier to set up (especially on Windows), and to keep things
working once *ring* 0.7.* gets yanked.
* Update the rust-openssl dependency while we're at it.
With Rust 1.15, proc macros have been stabilized. Therefore
custom build scripts are not required anymore.
This commit removes all the previous machinery and the
need for nightly.
