chore(3p/gerrit_plugins): init oauth r/2415

Add the OAuth gerrit plugin to our mini collection of Gerrit plugins.

This includes a patch to make the plugin work correctly with CAS 6.x,
which has changed the attributes into a JSON object with the attributes
nested inside, instead of a JSON list.

Change-Id: I4741f137cca9c8eb45b9ea660fb4cbf6962be9a4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2782
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

1 files changed, 26 insertions, 0 deletions

diff --git a/third_party/gerrit_plugins/oauth/default.nix b/third_party/gerrit_plugins/oauth/default.nix
new file mode 100644
index 0000000000..68434a902e
--- /dev/null
+++ b/third_party/gerrit_plugins/oauth/default.nix
@@ -0,0 +1,26 @@
+{ depot, pkgs, ... }@args:
+
+let
+  inherit (import ../builder.nix args) buildGerritBazelPlugin;
+in buildGerritBazelPlugin rec {
+  name = "oauth";
+  depsOutputHash = "sha256:0g0cga9s1bmzvii8nh372kdaxypc1rj0hlyhralwiyh67r4zlv2c";
+  src = pkgs.fetchgit {
+    url = "https://gerrit.googlesource.com/plugins/oauth";
+    rev = "4aa7322db5ec221b2419e12a9ec7af5b8c66659c";
+    sha256 = "1szra3pjl0axf4a7k96flpk7rhfvp37rdxay4gbglh939gzbba88";
+  };
+  overlayPluginCmd = ''
+    chmod +w "$out" "$out/plugins/external_plugin_deps.bzl"
+    cp -R "${src}" "$out/plugins/${name}"
+    cp "${src}/external_plugin_deps.bzl" "$out/plugins/external_plugin_deps.bzl"
+  '';
+
+  # The code in the OAuth repo expects CAS to return oauth2 access tokens as urlencoded.
+  # Our version of CAS returns them as JSON instead.
+  postPatch = ''
+    pushd plugins/oauth
+    patch -p1 <${./cas-6x.patch}
+    popd
+  '';
+}