feat: make webhook headers case insensitive (#100)

Author: stainless-bot

lithic-java-core/src/main/kotlin/com/lithic/api/core/Utils.kt

@@ -43,3 +43,17 @@ internal fun <K, V> ListMultimap<K, V>.toUnmodifiable(): ListMultimap<K, V> {
 
     return Multimaps.unmodifiableListMultimap(this)
 }
+
+@JvmSynthetic
+internal fun ListMultimap<String, String>.getRequiredHeader(header: String): String {
+    val value =
+        entries()
+            .stream()
+            .filter { entry -> entry.key.equals(header, ignoreCase = true) }
+            .map { entry -> entry.value }
+            .findFirst()
+    if (!value.isPresent) {
+        throw LithicInvalidDataException("Could not find $header header")
+    }
+    return value.get()
+}

lithic-java-core/src/main/kotlin/com/lithic/api/services/async/WebhookServiceAsyncImpl.kt

@@ -6,6 +6,7 @@ import com.fasterxml.jackson.core.JsonProcessingException
 import com.google.common.collect.ListMultimap
 import com.lithic.api.core.ClientOptions
 import com.lithic.api.core.JsonValue
+import com.lithic.api.core.getRequiredHeader
 import com.lithic.api.core.http.HttpResponse.Handler
 import com.lithic.api.errors.LithicError
 import com.lithic.api.errors.LithicException
@@ -56,15 +57,9 @@ constructor(
                 throw LithicException("Invalid webhook secret")
             }
 
-        val msgId =
-            headers.get("webhook-id").getOrNull(0)
-                ?: throw LithicException("Could not find webhook-id header")
-        val msgSignture =
-            headers.get("webhook-signature").getOrNull(0)
-                ?: throw LithicException("Could not find webhook-signature header")
-        val msgTimestamp =
-            headers.get("webhook-timestamp").getOrNull(0)
-                ?: throw LithicException("Could not find webhook-timestamp header")
+        val msgId = headers.getRequiredHeader("webhook-id")
+        val msgSignature = headers.getRequiredHeader("webhook-signature")
+        val msgTimestamp = headers.getRequiredHeader("webhook-timestamp")
 
         val timestamp =
             try {
@@ -86,7 +81,7 @@ constructor(
         val expectedSignature =
             mac.doFinal("$msgId.${timestamp.epochSecond}.$payload".toByteArray())
 
-        msgSignture.splitToSequence(" ").forEach {
+        msgSignature.splitToSequence(" ").forEach {
             val parts = it.split(",")
             if (parts.size != 2) {
                 return@forEach

lithic-java-core/src/main/kotlin/com/lithic/api/services/blocking/WebhookServiceImpl.kt

@@ -6,6 +6,7 @@ import com.fasterxml.jackson.core.JsonProcessingException
 import com.google.common.collect.ListMultimap
 import com.lithic.api.core.ClientOptions
 import com.lithic.api.core.JsonValue
+import com.lithic.api.core.getRequiredHeader
 import com.lithic.api.core.http.HttpResponse.Handler
 import com.lithic.api.errors.LithicError
 import com.lithic.api.errors.LithicException
@@ -56,15 +57,9 @@ constructor(
                 throw LithicException("Invalid webhook secret")
             }
 
-        val msgId =
-            headers.get("webhook-id").getOrNull(0)
-                ?: throw LithicException("Could not find webhook-id header")
-        val msgSignture =
-            headers.get("webhook-signature").getOrNull(0)
-                ?: throw LithicException("Could not find webhook-signature header")
-        val msgTimestamp =
-            headers.get("webhook-timestamp").getOrNull(0)
-                ?: throw LithicException("Could not find webhook-timestamp header")
+        val msgId = headers.getRequiredHeader("webhook-id")
+        val msgSignature = headers.getRequiredHeader("webhook-signature")
+        val msgTimestamp = headers.getRequiredHeader("webhook-timestamp")
 
         val timestamp =
             try {
@@ -86,7 +81,7 @@ constructor(
         val expectedSignature =
             mac.doFinal("$msgId.${timestamp.epochSecond}.$payload".toByteArray())
 
-        msgSignture.splitToSequence(" ").forEach {
+        msgSignature.splitToSequence(" ").forEach {
             val parts = it.split(",")
             if (parts.size != 2) {
                 return@forEach