feat: Add extraBody field to ChatCompletionRequest, for Claude/OpenAI compatible

Author: Stream29

src/main/kotlin/io/github/stream29/proxy/client/OpenAi.kt

@@ -22,14 +22,15 @@ data class OpenAiConfig(
     val baseUrl: String,
     val apiKey: String,
     val modelList: List<String>,
+    val extraRequest: (ChatCompletionRequest) -> ChatCompletionRequest = { it },
 ) : ApiProvider {
     override suspend fun getModelNameList(): List<String> = modelList
     override suspend fun generateLStream(request: LChatCompletionRequest): Flow<LChatCompletionResponseChunk> {
-        return chatCompletionsRecording(request.asOpenAiRequest()).map { it.asLChatCompletionResponseChunk() }
+        return chatCompletionsRecording(extraRequest(request.asOpenAiRequest())).map { it.asLChatCompletionResponseChunk() }
     }
 
     override suspend fun generateOStream(request: OChatRequest): Flow<OChatResponseChunk> {
-        return chatCompletionsRecording(request.asOpenAiRequest()).map { it.asOChatResponseChunk() }
+        return chatCompletionsRecording(extraRequest(request.asOpenAiRequest())).map { it.asOChatResponseChunk() }
     }
 
     override fun close() {}

src/main/kotlin/io/github/stream29/proxy/relocate/com.aallam.openai.api/chat/ChatCompletionRequest.kt

@@ -6,6 +6,7 @@ import io.github.stream29.proxy.relocate.com.aallam.openai.api.BetaOpenAI
 import io.github.stream29.proxy.relocate.com.aallam.openai.api.model.ModelId
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonElement
 
 /**
  * Creates a completion for the chat message.
@@ -183,6 +184,9 @@ data class ChatCompletionRequest(
      * Options for streaming response. Only used when in streaming mode.
      */
     @SerialName("stream_options") val streamOptions: StreamOptions? = null,
-    val stream: Boolean = true
+    val stream: Boolean = true,
+
+    @SerialName("extra_body")
+    val extraBody: JsonElement? = null,
 )