fixes header field names being case-sensitive (they must be case-insensitive)

Author: Emanuel Moecklin

build.gradle.kts

@@ -48,7 +48,7 @@ publishing {
         create<MavenPublication>("maven") {
             group = "com.1gravity"
             artifactId = "ktor-openapi-generator"
-            version = "0.2-beta.17"
+            version = "0.2-beta.20"
 
             from(components["java"])
 

src/main/kotlin/com/papsign/ktor/openapigen/annotations/mapping/OpenAPIName.kt

@@ -1,5 +1,6 @@
 package com.papsign.ktor.openapigen.annotations.mapping
 
+import com.papsign.ktor.openapigen.annotations.parameters.HeaderParam
 import java.util.*
 import kotlin.reflect.KParameter
 import kotlin.reflect.full.findAnnotation
@@ -10,7 +11,10 @@ annotation class OpenAPIName(val name: String)
 private val cache = Collections.synchronizedMap(HashMap<KParameter, String?>())
 
 val KParameter.openAPIName: String?
-    get() = cache.getOrPut(this) { findAnnotation<OpenAPIName>()?.name ?: name }
+    get() = cache.getOrPut(this) {
+        val caseSensitiveName = findAnnotation<OpenAPIName>()?.name ?: name
+        if (findAnnotation<HeaderParam>() != null) caseSensitiveName?.toLowerCase() else caseSensitiveName
+    }
 
 fun <T> KParameter.remapOpenAPINames(map: Map<String, T>): Map<String, T> {
     val replace = this.openAPIName

src/main/kotlin/com/papsign/ktor/openapigen/parameters/handlers/ModularParameterHandler.kt

@@ -30,7 +30,14 @@ class ModularParameterHandler<T>(val parsers: Map<KParameter, Builder<*>>, val c
 
     override fun parse(parameters: Parameters, headers: Headers): T {
         return constructor.callBy(parsers.mapValues {
-            val value = it.value.build(it.key.name.toString(), it.key.remapOpenAPINames(parameters.toMap() + headers.toMap()))
+            val headerMap = headers.toMap().entries
+                .groupBy { entry -> entry.key.toLowerCase() }
+                .mapValues { entry -> entry.value.flatMap { mapEntry -> mapEntry.value } }
+            val value = it.value.build(
+                it.key.name.toString(),
+                it.key.remapOpenAPINames(parameters.toMap() + headerMap)
+            )
+
             if (value != null || it.key.type.isMarkedNullable) {
                 value
             } else {