[PM-9363] Disable cipher key encryption for older server versions (#4006)

app/src/main/java/com/x8bit/bitwarden/data/platform/manager/FeatureFlagManagerImpl.kt

@@ -3,10 +3,12 @@ package com.x8bit.bitwarden.data.platform.manager
 import com.x8bit.bitwarden.data.platform.datasource.disk.model.ServerConfig
 import com.x8bit.bitwarden.data.platform.manager.model.FlagKey
 import com.x8bit.bitwarden.data.platform.repository.ServerConfigRepository
+import com.x8bit.bitwarden.data.platform.util.isServerVersionAtLeast
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 
 private const val CIPHER_KEY_ENCRYPTION_KEY = "enableCipherKeyEncryption"
+private const val CIPHER_KEY_ENC_MIN_SERVER_VERSION = "2024.2.0"
 
 /**
  * Primary implementation of [FeatureFlagManager].
@@ -16,7 +18,13 @@ class FeatureFlagManagerImpl(
 ) : FeatureFlagManager {
 
     override val sdkFeatureFlags: Map<String, Boolean>
-        get() = mapOf(CIPHER_KEY_ENCRYPTION_KEY to true)
+        get() = mapOf(
+            CIPHER_KEY_ENCRYPTION_KEY to
+                isServerVersionAtLeast(
+                    serverConfigRepository.serverConfigStateFlow.value,
+                    CIPHER_KEY_ENC_MIN_SERVER_VERSION,
+                ),
+        )
 
     override fun <T : Any> getFeatureFlagFlow(key: FlagKey<T>): Flow<T> =
         serverConfigRepository

app/src/main/java/com/x8bit/bitwarden/data/platform/util/ServerVersionUtils.kt

@@ -0,0 +1,51 @@
+package com.x8bit.bitwarden.data.platform.util
+
+import com.x8bit.bitwarden.data.platform.datasource.disk.model.ServerConfig
+import kotlin.text.split
+import kotlin.text.toIntOrNull
+
+private const val VERSION_SEPARATOR = "."
+private const val SUFFIX_SEPARATOR = "-"
+
+/**
+ * Checks if the server version is greater than another provided version, returns true if it is.
+ */
+fun isServerVersionAtLeast(serverConfig: ServerConfig?, version: String): Boolean {
+    val serverVersion = serverConfig
+        ?.serverData
+        ?.version
+
+    if (serverVersion.isNullOrEmpty() || version.isEmpty()) {
+        return false
+    }
+
+    val serverVersionParts = getVersionComponents(serverVersion)
+    val otherVersionParts = getVersionComponents(version)
+
+    if (serverVersionParts.isNullOrEmpty() || otherVersionParts.isNullOrEmpty()) {
+        return false
+    }
+
+    // Must iterate through all indices to establish if versions are equal
+    for (i in serverVersionParts.indices) {
+        val serverPart = serverVersionParts.getOrNull(i)?.toIntOrNull() ?: 0
+        val otherPart = otherVersionParts.getOrNull(i)?.toIntOrNull() ?: 0
+
+        if (serverPart > otherPart) {
+            return true
+        } else if (serverPart < otherPart) {
+            return false
+        }
+    }
+
+    // Versions are equal
+    return true
+}
+
+/**
+ * Extracts the version components from a version string, disregarding any suffixes.
+ */
+private fun getVersionComponents(version: String?): List<String>? {
+    val versionComponents = version?.split(SUFFIX_SEPARATOR)?.first()
+    return versionComponents?.split(VERSION_SEPARATOR)
+}

app/src/test/java/com/x8bit/bitwarden/data/platform/manager/FeatureFlagManagerTest.kt

@@ -7,6 +7,7 @@ import com.x8bit.bitwarden.data.platform.datasource.network.model.ConfigResponse
 import com.x8bit.bitwarden.data.platform.datasource.network.model.ConfigResponseJson.ServerJson
 import com.x8bit.bitwarden.data.platform.manager.model.FlagKey
 import com.x8bit.bitwarden.data.platform.repository.util.FakeServerConfigRepository
+import com.x8bit.bitwarden.data.platform.util.isServerVersionAtLeast
 import kotlinx.coroutines.test.runTest
 import kotlinx.serialization.json.JsonPrimitive
 import org.junit.Test
@@ -33,6 +34,53 @@ class FeatureFlagManagerTest {
         assertEquals(expected, actual)
     }
 
+    @Test
+    fun `server version is at least supplied version`() {
+        val result =
+            isServerVersionAtLeast(
+                fakeServerConfigRepository.serverConfigStateFlow.value,
+                "2024.2.0",
+            )
+
+        // This relies on the fake server version being "2024.7.0"
+        assertTrue(result)
+    }
+
+    @Test
+    fun `server version is not at least supplied version`() {
+        val result =
+            isServerVersionAtLeast(
+                fakeServerConfigRepository.serverConfigStateFlow.value,
+                "2024.12.0-suffix",
+            )
+
+        // This relies on the fake server version being "2024.7.0"
+        assertFalse(result)
+    }
+
+    @Test
+    fun `server version is the same as supplied version`() {
+        val result =
+            isServerVersionAtLeast(
+                fakeServerConfigRepository.serverConfigStateFlow.value,
+                "2024.7.0",
+            )
+
+        // This relies on the fake server version being "2024.7.0"
+        assertTrue(result)
+    }
+
+    @Test
+    fun `server version is not the same as blank supplied version`() {
+        val result =
+            isServerVersionAtLeast(
+                fakeServerConfigRepository.serverConfigStateFlow.value,
+                "",
+            )
+
+        assertFalse(result)
+    }
+
     @Test
     fun `ServerConfigRepository flow with value should trigger new flags`() = runTest {
         fakeServerConfigRepository.serverConfigValue = null