Backwards compat: Put the confidential-identities module back in the node classpath by default. Separating it out into a standalone "app" needs more thought and design work, if we do it at all.

confidential-identities/build.gradle

@@ -1,7 +1,5 @@
-// Experimental Confidential Identities support for 1.0
-// This contains the prototype SwapIdentitiesFlow and SwapIdentitiesHandler, which can be used
-// for exchanging confidential identities as part of a flow, until a permanent solution is prepared.
-// Expect this module to be removed and merged into core in a later release.
+// This contains the SwapIdentitiesFlow which can be used for exchanging confidential identities as part of a flow.
+// TODO: Merge this into core: the original plan was to develop it independently but in practice it's too widely used to break compatibility now, as finance uses it.
 apply plugin: 'kotlin'
 apply plugin: CanonicalizerPlugin
 apply plugin: 'net.corda.plugins.publish-utils'
@@ -27,17 +25,6 @@ dependencies {
     testCompile "org.assertj:assertj-core:$assertj_version"
 }
 
-cordapp {
-    targetPlatformVersion corda_platform_version.toInteger()
-    minimumPlatformVersion 1
-    workflow {
-        name "Corda Experimental Confidential Identities"
-        versionId 1
-        vendor "R3"
-        licence "Open Source (Apache 2)"
-    }
-}
-
 jar {
     baseName 'corda-confidential-identities'
 }

confidential-identities/src/main/kotlin/net/corda/confidential/SwapIdentitiesFlow.kt

@@ -124,14 +124,4 @@ private constructor(private val otherSideSession: FlowSession?,
 @CordaSerializable
 data class CertificateOwnershipAssertion(val x500Name: CordaX500Name, val publicKey: PublicKey)
 
-open class SwapIdentitiesException @JvmOverloads constructor(message: String, cause: Throwable? = null) : FlowException(message, cause)
-
-// This only exists for backwards compatibility
-@InitiatedBy(SwapIdentitiesFlow::class)
-private class SwapIdentitiesHandler(private val otherSide: FlowSession) : FlowLogic<Unit>() {
-    @Suspendable
-    override fun call() {
-        subFlow(SwapIdentitiesFlow(otherSide))
-        logger.warnOnce("Insecure API to swap anonymous identities was used by ${otherSide.counterparty} (${otherSide.getCounterpartyFlowInfo()})")
-    }
-}
+open class SwapIdentitiesException @JvmOverloads constructor(message: String, cause: Throwable? = null) : FlowException(message, cause)

docs/source/changelog.rst

@@ -74,9 +74,6 @@ Version 4.0
 
 * Fixed a problem that was preventing `Cash.generateSpend` to be used more than once per transaction (https://github.com/corda/corda/issues/4110).
 
-* The experimental confidential-identities is now a separate CorDapp and must now be loaded onto the node alongside any CorDapp that needs it.
-  This also means your gradle dependency for it should be ``cordapp`` and not ``cordaCompile``.
-
 * Fixed a bug resulting in poor vault query performance and incorrect results when sorting.
 
 * Improved exception thrown by `AttachmentsClassLoader` when an attachment cannot be used because its uploader is not trusted.

docs/source/release-notes.rst

@@ -292,12 +292,6 @@ The TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 family of ciphers is retired from the li
 as it is a legacy cipher family not supported by all native SSL/TLS implementations. We anticipate that this
 will have no impact on any deployed configurations.
 
-Confidential identities
-+++++++++++++++++++++++
-
-If any of your CorDapps use the experimental confidential-identities module then it also needs to be loaded as a separate CorDapp jar. This
-includes the demo finance CorDapp.
-
 Miscellaneous changes
 ~~~~~~~~~~~~~~~~~~~~~
 

finance/workflows/build.gradle

@@ -28,8 +28,8 @@ dependencies {
     // cordapp project(':finance:workflows')
     // cordapp project(':finance:contracts')
     cordaCompile project(':core')
+    cordaCompile project(':confidential-identities')
     
-    cordapp project(':confidential-identities')
     cordapp project(':finance:contracts')
 
     // For JSON

node/build.gradle

@@ -73,6 +73,10 @@ dependencies {
     compile project(':tools:cliutils')
     compile project(':common-validation')
     compile project(':common-configuration-parsing')
+    
+    // Backwards compatibility goo: Apps expect confidential-identities to be loaded by default.
+    // We could eventually gate this on a target-version check.
+    compile project(':confidential-identities')
 
     // Log4J: logging framework (with SLF4J bindings)
     compile "org.apache.logging.log4j:log4j-slf4j-impl:${log4j_version}"

node/src/main/kotlin/net/corda/node/internal/SwapIdentitiesHandler.kt

@@ -0,0 +1,22 @@
+package net.corda.node.internal
+
+import co.paralleluniverse.fibers.Suspendable
+import net.corda.confidential.SwapIdentitiesFlow
+import net.corda.core.flows.FlowLogic
+import net.corda.core.flows.FlowSession
+import net.corda.core.flows.InitiatedBy
+import net.corda.core.internal.warnOnce
+
+/**
+ * Exists for backwards compatibility - the old confidential-identities API didn't use inlined flows. One day we'll need to disable this,
+ * but it is a complex versioning problem because we don't know which peers we might interact with. Disabling it will probably have to be
+ * gated on a minPlatformVersion bump.
+ */
+@InitiatedBy(SwapIdentitiesFlow::class)
+class SwapIdentitiesHandler(private val otherSide: FlowSession) : FlowLogic<Unit>() {
+    @Suspendable
+    override fun call() {
+        subFlow(SwapIdentitiesFlow(otherSide))
+        logger.warnOnce("Insecure API to swap anonymous identities was used by ${otherSide.counterparty} (${otherSide.getCounterpartyFlowInfo()})")
+    }
+}

samples/bank-of-corda-demo/build.gradle

@@ -11,7 +11,6 @@ dependencies {
     // The bank of corda CorDapp depends upon Cash CorDapp features
     cordapp project(':finance:contracts')
     cordapp project(':finance:workflows')
-    cordapp project(':confidential-identities')
 
     // Corda integration dependencies
     cordaRuntime project(path: ":node:capsule", configuration: 'runtimeArtifacts')
@@ -35,7 +34,6 @@ task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar', nodeTask,
     nodeDefaults {
         cordapp project(':finance:workflows')
         cordapp project(':finance:contracts')
-        cordapp project(':confidential-identities')
     }
     node {
         name "O=Notary Service,L=Zurich,C=CH"

samples/trader-demo/build.gradle

@@ -9,7 +9,6 @@ dependencies {
     // The trader demo CorDapp depends upon Cash CorDapp features
     cordapp project(':finance:contracts')
     cordapp project(':finance:workflows')
-    cordapp project(':confidential-identities')
     cordapp project(':samples:bank-of-corda-demo')
     cordapp project(':samples:trader-demo:workflows-trader')
 
@@ -32,7 +31,6 @@ task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar', nodeTask,
         }
         cordapp project(':finance:workflows')
         cordapp project(':finance:contracts')
-        cordapp project(':confidential-identities')
         cordapp project(':samples:trader-demo:workflows-trader')
     }
     directory "./build/nodes"

tools/demobench/build.gradle

@@ -138,11 +138,6 @@ distributions {
                 into 'cordapps'
                 fileMode = 0444
             }
-            from(project(':confidential-identities').tasks.jar) {
-                rename 'corda-confidential-identities(.*)', 'corda-confidential-identities.jar'
-                into 'cordapps'
-                fileMode = 0444
-            }
         }
     }
 }

tools/demobench/src/main/kotlin/net/corda/demobench/plugin/CordappController.kt

@@ -22,8 +22,7 @@ class CordappController : Controller() {
     private val cordappDir: Path = jvm.applicationDir / NodeConfig.CORDAPP_DIR_NAME
     private val cordappJars = setOf(
             cordappDir / "$FINANCE_CONTRACTS_CORDAPP_FILENAME.jar",
-            cordappDir / "$FINANCE_WORKFLOWS_CORDAPP_FILENAME.jar",
-            cordappDir / "corda-confidential-identities.jar"
+            cordappDir / "$FINANCE_WORKFLOWS_CORDAPP_FILENAME.jar"
     )
 
     /**