Allow custom logging

README.md

@@ -144,6 +144,10 @@ the following options:
   default value is null.
 - `openId4VciConfig` method allows you to specify the configuration for OpenID4VCI. The default
   value is null.
+- `logger` method allows you to specify the logger. If the logger is not provided, the default
+  logger will be used.
+- `logLevel` method allows you to specify the log level for the default logger. The default value
+  is `Logger.LEVEL_ERROR`.
 
 The following example shows how to initialize the library:
 
@@ -153,11 +157,16 @@ import eu.europa.ec.eudi.wallet.EudiWallet
 import eu.europa.ec.eudi.wallet.EudiWalletConfig
 import eu.europa.ec.eudi.wallet.Logger
 import java.security.cert.X509Certificate
-
+val logger = Logger { record: Logger.Record ->
+    // log the record
+}
 val storageDir = applicationContext.noBackupFilesDir
 val verifierApiUri = "https://verifier-api-uri"
 val config = EudiWalletConfig.Builder(applicationContext)
+    // set the log level for the default logger
     .logLevel(Logger.LEVEL_DEBUG)
+    // or set a custom logger
+    .logger(logger)
     .ktorHttpClientFactory {
         // Provide your own Ktor HttpClient.
         // This will be used for OpenId4VCI and OpenId4VP communication.

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/EudiWallet.kt

@@ -35,7 +35,6 @@ import eu.europa.ec.eudi.wallet.document.sample.SampleDocumentManager
 import eu.europa.ec.eudi.wallet.internal.getCertificate
 import eu.europa.ec.eudi.wallet.internal.mainExecutor
 import eu.europa.ec.eudi.wallet.issue.openid4vci.*
-import eu.europa.ec.eudi.wallet.logging.Logger
 import eu.europa.ec.eudi.wallet.transfer.openid4vp.OpenId4VpCBORResponse
 import eu.europa.ec.eudi.wallet.transfer.openid4vp.OpenId4VpCBORResponseGeneratorImpl
 import eu.europa.ec.eudi.wallet.transfer.openid4vp.OpenId4vpManager
@@ -77,9 +76,7 @@ object EudiWallet {
     private var transferMode: TransferMode? = null
 
     private val logger by lazy {
-        requireInit {
-            Logger(_config)
-        }
+        requireInit { _config.logger }
     }
 
     /**

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/EudiWalletConfig.kt

@@ -163,6 +163,11 @@ class EudiWalletConfig private constructor(builder: Builder) {
      */
     val logLevel: Int = builder.logLevel
 
+    /**
+     * The logger. If no [Logger] instance is provided and [logLevel] is not [Logger.OFF], then the default will be used
+     */
+    val logger: Logger? = builder.logger ?: Logger(this).takeUnless { builder.logLevel == Logger.OFF }
+
     /**
      * Ktor http client factory
      */
@@ -202,6 +207,7 @@ class EudiWalletConfig private constructor(builder: Builder) {
         var verifyMsoPublicKey: Boolean = true
         var openId4VpConfig: OpenId4VpConfig? = null
         var openId4VciConfig: OpenId4VciConfig? = null
+        var logger: Logger? = null
         var logLevel: Int = Logger.LEVEL_ERROR
         var ktorHttpClientFactory: (() -> HttpClient)? = null
 
@@ -366,6 +372,15 @@ class EudiWalletConfig private constructor(builder: Builder) {
             this.openId4VciConfig = OpenId4VciConfig.Builder().apply(block).build()
         }
 
+        /**
+         * Set a logger
+         * @param logger The logger
+         * @return [EudiWalletConfig.Builder]
+         */
+        fun logger(logger: Logger) = apply {
+            this.logger = logger
+        }
+
         /**
          * Set the debug logging level.
          * The default value is [LogLevel.OFF].

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/issue/openid4vci/IssuerAuthorization.kt

@@ -26,6 +26,8 @@ import eu.europa.ec.eudi.openid4vci.AuthorizedRequest
 import eu.europa.ec.eudi.openid4vci.Issuer
 import eu.europa.ec.eudi.wallet.issue.openid4vci.OpenId4VciManager.Companion.TAG
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.d
+import eu.europa.ec.eudi.wallet.logging.e
 import kotlinx.coroutines.CancellableContinuation
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlin.coroutines.cancellation.CancellationException

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/issue/openid4vci/ProcessDeferredOutcome.kt

@@ -23,6 +23,7 @@ import eu.europa.ec.eudi.wallet.document.DocumentManager
 import eu.europa.ec.eudi.wallet.document.StoreDocumentResult
 import eu.europa.ec.eudi.wallet.issue.openid4vci.OpenId4VciManager.Companion.TAG
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.d
 import org.bouncycastle.util.encoders.Hex
 import java.util.*
 

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/issue/openid4vci/ProcessResponse.kt

@@ -25,6 +25,7 @@ import eu.europa.ec.eudi.wallet.document.UnsignedDocument
 import eu.europa.ec.eudi.wallet.issue.openid4vci.IssueEvent.Companion.documentFailed
 import eu.europa.ec.eudi.wallet.issue.openid4vci.OpenId4VciManager.Companion.TAG
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.d
 import kotlinx.coroutines.CancellableContinuation
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.suspendCancellableCoroutine

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/issue/openid4vci/Utils.kt

@@ -24,6 +24,8 @@ import eu.europa.ec.eudi.wallet.document.DocumentManager
 import eu.europa.ec.eudi.wallet.document.UnsignedDocument
 import eu.europa.ec.eudi.wallet.issue.openid4vci.OpenId4VciManager.Companion.TAG
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.d
+import eu.europa.ec.eudi.wallet.logging.e
 import org.bouncycastle.util.io.pem.PemObject
 import org.bouncycastle.util.io.pem.PemWriter
 import java.io.StringWriter

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/logging/Logger.kt

@@ -22,17 +22,21 @@ import eu.europa.ec.eudi.wallet.EudiWalletConfig
 import eu.europa.ec.eudi.wallet.logging.Logger.Companion.LEVEL_DEBUG
 import eu.europa.ec.eudi.wallet.logging.Logger.Companion.LEVEL_ERROR
 import eu.europa.ec.eudi.wallet.logging.Logger.Companion.LEVEL_INFO
+import java.time.Instant
 
 
-interface Logger {
+fun interface Logger {
 
-    @Level
-    val level: Int
-    fun log(level: Int, tag: String, message: String, throwable: Throwable? = null)
+    data class Record(
+        @Level val level: Int,
+        val instant: Instant = Instant.now(),
+        val message: String,
+        val thrown: Throwable? = null,
+        val sourceClassName: String? = null,
+        val sourceMethod: String? = null,
+    )
 
-    fun d(tag: String, message: String) = log(LEVEL_DEBUG, tag, message)
-    fun i(tag: String, message: String) = log(LEVEL_INFO, tag, message)
-    fun e(tag: String, message: String, throwable: Throwable? = null) = log(LEVEL_ERROR, tag, message, throwable)
+    fun log(record: Record)
 
     companion object {
         const val OFF = 0
@@ -51,19 +55,16 @@ interface Logger {
 }
 
 class LoggerImpl(val config: EudiWalletConfig, private val maxLogSize: Int = 1000) : Logger {
-    override val level: Int = config.logLevel
-    override fun log(level: Int, tag: String, message: String, throwable: Throwable?) {
-        splitMessage(message).forEachIndexed { i, m ->
+    override fun log(record: Logger.Record) {
+        val tag = record.sourceClassName ?: ""
+        splitMessage(record.message).forEachIndexed { i, m ->
             when {
-                level == LEVEL_ERROR && config.logLevel >= LEVEL_ERROR && i == 0 && throwable != null -> Log.e(
-                    tag,
-                    m,
-                    throwable
-                )
+                record.level == LEVEL_ERROR && config.logLevel >= LEVEL_ERROR && i == 0 && record.thrown != null ->
+                    Log.e(tag, m, record.thrown)
 
-                level == LEVEL_ERROR && config.logLevel >= LEVEL_ERROR -> Log.e(tag, m)
-                level == LEVEL_INFO && config.logLevel >= LEVEL_INFO -> Log.i(tag, m)
-                level == LEVEL_DEBUG && config.logLevel >= LEVEL_DEBUG -> Log.d(tag, m)
+                record.level == LEVEL_ERROR && config.logLevel >= LEVEL_ERROR -> Log.e(tag, m)
+                record.level == LEVEL_INFO && config.logLevel >= LEVEL_INFO -> Log.i(tag, m)
+                record.level == LEVEL_DEBUG && config.logLevel >= LEVEL_DEBUG -> Log.d(tag, m)
             }
         }
     }
@@ -76,7 +77,34 @@ class LoggerImpl(val config: EudiWalletConfig, private val maxLogSize: Int = 100
         }
         return messages
     }
+}
 
+@JvmSynthetic
+internal fun Logger.d(tag: String, message: String) = log(
+    Logger.Record(
+        level = LEVEL_DEBUG,
+        sourceClassName = tag,
+        message = message
+    )
+)
 
-}
+@JvmSynthetic
+internal fun Logger.i(tag: String, message: String) = log(
+    Logger.Record(
+        level = LEVEL_INFO,
+        sourceClassName = tag,
+        message = message
+    )
+)
+
+@JvmSynthetic
+internal fun Logger.e(tag: String, message: String, throwable: Throwable? = null) =
+    log(
+        Logger.Record(
+            level = LEVEL_ERROR,
+            sourceClassName = tag,
+            message = message,
+            thrown = throwable
+        )
+    )
 

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/transfer/openid4vp/OpenId4VpCBORResponseGeneratorImpl.kt

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2023 European Commission
+ *  Copyright (c) 2023-2024 European Commission
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -38,6 +38,8 @@ import eu.europa.ec.eudi.iso18013.transfer.response.SessionTranscriptBytes
 import eu.europa.ec.eudi.openid4vp.legalName
 import eu.europa.ec.eudi.wallet.internal.Openid4VpX509CertificateTrust
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.e
+import eu.europa.ec.eudi.wallet.logging.i
 
 private const val TAG = "OpenId4VpCBORResponseGe"
 

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/transfer/openid4vp/OpenId4vpManager.kt

@@ -31,6 +31,9 @@ import eu.europa.ec.eudi.prex.PresentationSubmission
 import eu.europa.ec.eudi.wallet.internal.Openid4VpUtils
 import eu.europa.ec.eudi.wallet.internal.mainExecutor
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.d
+import eu.europa.ec.eudi.wallet.logging.e
+import eu.europa.ec.eudi.wallet.logging.i
 import eu.europa.ec.eudi.wallet.util.CBOR
 import eu.europa.ec.eudi.wallet.util.wrappedWithContentNegotiation
 import eu.europa.ec.eudi.wallet.util.wrappedWithLogging

wallet-core/src/main/java/eu/europa/ec/eudi/wallet/util/KtorHttpClientFactoryExtensions.kt

@@ -18,6 +18,7 @@ package eu.europa.ec.eudi.wallet.util
 
 import eu.europa.ec.eudi.wallet.issue.openid4vci.OpenId4VciManager.Companion.TAG
 import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.d
 import io.ktor.client.*
 import io.ktor.client.plugins.contentnegotiation.*
 import io.ktor.client.plugins.logging.*

wallet-core/src/test/java/eu/europa/ec/eudi/wallet/EudiWalletConfigTest.kt

@@ -17,6 +17,8 @@
 package eu.europa.ec.eudi.wallet
 
 import android.content.Context
+import eu.europa.ec.eudi.wallet.logging.Logger
+import eu.europa.ec.eudi.wallet.logging.LoggerImpl
 import eu.europa.ec.eudi.wallet.transfer.openid4vp.ClientIdScheme
 import eu.europa.ec.eudi.wallet.transfer.openid4vp.EncryptionAlgorithm
 import eu.europa.ec.eudi.wallet.transfer.openid4vp.EncryptionMethod
@@ -124,4 +126,32 @@ class EudiWalletConfigTest {
         assertNull(config.openId4VPConfig)
         assertNull(config.openId4VciConfig)
     }
+
+    @Test
+    fun testLoggerIsNullWhenLogLevelIsOff() {
+        val config = EudiWalletConfig(context) {
+            logLevel = Logger.OFF
+        }
+
+        assertNull(config.logger)
+    }
+
+    @Test
+    fun testLoggerIsDefaultImplementationWhenLogLevelIsNotOff() {
+        val config = EudiWalletConfig(context) {
+            logLevel = Logger.LEVEL_ERROR
+        }
+
+        assertTrue(config.logger is LoggerImpl)
+    }
+
+    @Test
+    fun testCustomLogger() {
+        val logger = Logger { record -> println(record) }
+        val config = EudiWalletConfig(context) {
+            this.logger = logger
+        }
+
+        assertTrue(config.logger == logger)
+    }
 }