all: Fix opencensus-api dependency conflict (#7739)

We depend on 0.28.0 while oauth2 depends on 0.24.0. This change replaces oauth2's opencensus-api dependency with our own.

alts/build.gradle

@@ -22,12 +22,7 @@ dependencies {
             libraries.protobuf,
             libraries.conscrypt
     def nettyDependency = implementation project(':grpc-netty')
-    implementation (libraries.google_auth_oauth2_http) {
-        // prefer our own versions instead of google-auth-oauth2-http's dependency
-        exclude group: 'com.google.guava', module: 'guava'
-        // we'll always be more up-to-date
-        exclude group: 'io.grpc', module: 'grpc-context'
-    }
+    googleOauth2Dependency 'implementation'
     guavaDependency 'implementation'
     compileOnly libraries.javax_annotation
 

auth/build.gradle

@@ -11,8 +11,8 @@ dependencies {
     api project(':grpc-api'),
             libraries.google_auth_credentials
     guavaDependency 'implementation'
-    testImplementation project(':grpc-testing'),
-            libraries.google_auth_oauth2_http
+    testImplementation project(':grpc-testing')
+    googleOauth2Dependency 'testImplementation'
     signature "org.codehaus.mojo.signature:java17:1.0@signature"
     signature "net.sf.androidscents.signature:android-api-level-14:4.0_r4@signature"
 }

build.gradle

@@ -239,6 +239,17 @@ subprojects {
             guavaDependency 'runtimeOnly'
         }
 
+        googleOauth2Dependency = { configurationName ->
+            dependencies."$configurationName"(libraries.google_auth_oauth2_http) {
+                exclude group: 'com.google.guava', module: 'guava'
+                exclude group: 'io.grpc', module: 'grpc-context'
+                exclude group: 'io.opencensus', module: 'opencensus-api'
+            }
+            dependencies.runtimeOnly project(':grpc-context')
+            censusApiDependency 'runtimeOnly'
+            guavaDependency 'runtimeOnly'
+        }
+
         // A util function to config perfmark dependency with transitive
         // dependencies properly resolved for the failOnVersionConflict strategy.
         perfmarkDependency = { configurationName ->

interop-testing/build.gradle

@@ -27,10 +27,10 @@ dependencies {
             project(':grpc-stub'),
             project(':grpc-testing'),
             project(path: ':grpc-xds', configuration: 'shadow'),
-            libraries.google_auth_oauth2_http,
             libraries.junit,
             libraries.truth
     censusGrpcMetricDependency 'implementation'
+    googleOauth2Dependency 'implementation'
     compileOnly libraries.javax_annotation
     runtimeOnly libraries.opencensus_impl,
             libraries.netty_tcnative,