fix: implement logger

modules/logger/build.gradle.kts

@@ -18,6 +18,7 @@ kotlin {
         val commonMain by getting {
             dependencies {
                 implementation(libs.kermit.logging)
+                implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.1")
             }
         }
     }

modules/logger/src/commonMain/kotlin/com/sphereon/oid/fed/logger/Logger.kt

@@ -1,26 +1,49 @@
-package com.sphereon.oid.fed.common.logging
+package com.sphereon.oid.fed.logger
 
-import co.touchlab.kermit.Logger
+import co.touchlab.kermit.*
+import co.touchlab.kermit.Logger as KermitLogger
+import kotlinx.datetime.Clock
 
-object Logger {
+object TimestampFormatter : MessageStringFormatter {
+    override fun formatMessage(severity: Severity?, tag: Tag?, message: Message): String {
+        val sb = StringBuilder()
+        val now = Clock.System.now()
+        sb.append("[${severity.toString().uppercase()}] ")
+        sb.append(now.toString())
+        sb.append(" ")
+        sb.append(super.formatMessage(null, tag, message))
+        return sb.toString()
+    }
+}
+
+class Logger(private val tag: String = "") {
+    fun verbose(message: String, tag: String = this.tag) {
+        KermitLogger.v(tag = tag, messageString = message)
+    }
 
-    fun verbose(tag: String, message: String) {
-        Logger.v(tag = tag, messageString = message)
+    fun debug(message: String, tag: String = this.tag) {
+        KermitLogger.d(tag = tag, messageString = message)
     }
 
-    fun debug(tag: String, message: String) {
-        Logger.d(tag = tag, messageString = message)
+    fun info(message: String, tag: String = this.tag) {
+        KermitLogger.i(tag = tag, messageString = message)
     }
 
-    fun info(tag: String, message: String) {
-        Logger.i(tag = tag, messageString = message)
+    fun warn(message: String, tag: String = this.tag) {
+        KermitLogger.w(tag = tag, messageString = message)
     }
 
-    fun warn(tag: String, message: String) {
-        Logger.w(tag = tag, messageString = message)
+    fun error(message: String, throwable: Throwable? = null, tag: String = this.tag) {
+        KermitLogger.e(tag = tag, messageString = message, throwable = throwable)
     }
 
-    fun error(tag: String, message: String, throwable: Throwable? = null) {
-        Logger.e(tag = tag, messageString = message, throwable = throwable)
+    fun setMinSeverity(severity: Severity) = KermitLogger.setMinSeverity(severity)
+    fun setLogWriters() = KermitLogger.setLogWriters(platformLogWriter(TimestampFormatter))
+
+    object Static {
+        fun tag(tag: String = "", severity: Severity = Severity.Info) =
+            Logger(tag).also { it.setMinSeverity(severity) }.also { it.setLogWriters() }
     }
 }
+
+val DefaultLogger = Logger.Static.tag("")

modules/openid-federation-client/build.gradle.kts

@@ -44,6 +44,7 @@ kotlin {
         val commonMain by getting {
             dependencies {
                 api(projects.modules.openapi)
+                api(projects.modules.logger)
                 implementation("io.ktor:ktor-client-core:$ktorVersion")
                 implementation("io.ktor:ktor-client-logging:$ktorVersion")
                 implementation("io.ktor:ktor-client-content-negotiation:$ktorVersion")

modules/openid-federation-client/src/commonMain/kotlin/com/sphereon/oid/fed/client/ClientConstants.kt

@@ -0,0 +1,8 @@
+package com.sphereon.oid.fed.client
+
+import com.sphereon.oid.fed.logger.Logger
+
+object ClientConstants {
+    private const val LOG_NAMESPACE = "sphereon:oid:fed:client"
+    val LOG = Logger.Static.tag(LOG_NAMESPACE)
+}

modules/openid-federation-client/src/commonMain/kotlin/com/sphereon/oid/fed/client/trustchain/TrustChain.kt

@@ -1,5 +1,6 @@
 package com.sphereon.oid.fed.client.trustchain
 
+import com.sphereon.oid.fed.client.ClientConstants
 import com.sphereon.oid.fed.client.crypto.ICryptoCallbackService
 import com.sphereon.oid.fed.client.crypto.findKeyInJwks
 import com.sphereon.oid.fed.client.fetch.IFetchCallbackService
@@ -33,9 +34,10 @@ class TrustChain(private val fetchService: IFetchCallbackService, private val cr
         val cache = SimpleCache<String, String>()
         val chain: MutableList<String> = arrayListOf()
         return try {
+            ClientConstants.LOG.debug("Resolving trust chain for entity $entityIdentifier and trust anchors $trustAnchors")
             buildTrustChainRecursive(entityIdentifier, trustAnchors, chain, cache)
-        } catch (_: Exception) {
-            // Log error
+        } catch (e: Exception) {
+            ClientConstants.LOG.debug("Failed to resolve trust chain for entity $entityIdentifier and trust anchors $trustAnchors, error: $e")
             null
         }
     }
@@ -176,7 +178,8 @@ class TrustChain(private val fetchService: IFetchCallbackService, private val cr
                 if (result != null) return result
                 chain.removeLast()
             }
-        } catch (_: Exception) {
+        } catch (e: Exception) {
+            ClientConstants.LOG.debug("Failed to process authority $authority, error: $e")
             return null
         }