82 lines
2.6 KiB
Kotlin
82 lines
2.6 KiB
Kotlin
package org.moire.ultrasonic.api.subsonic.interceptors
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import com.fasterxml.jackson.core.JsonFactory
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import com.fasterxml.jackson.core.JsonParseException
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import com.fasterxml.jackson.core.JsonToken
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import java.io.IOException
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import okhttp3.Interceptor
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import okhttp3.Interceptor.Chain
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import okhttp3.Response
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import org.moire.ultrasonic.api.subsonic.SubsonicAPIVersions
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private const val DEFAULT_PEEK_BYTE_COUNT = 1000L
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/**
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* Special [Interceptor] that adds client supported version to request and tries to update it
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* from server response.
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*
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* Optionally [notifier] will be invoked on version change.
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*
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* @author Yahor Berdnikau
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*/
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internal class VersionInterceptor(
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internal var protocolVersion: SubsonicAPIVersions,
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private val notifier: (SubsonicAPIVersions) -> Unit = {}
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) : Interceptor {
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private val jsonFactory = JsonFactory()
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override fun intercept(chain: Chain): okhttp3.Response {
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val originalRequest = chain.request()
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val newRequest = originalRequest.newBuilder()
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.url(
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originalRequest
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.url()
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.newBuilder()
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.addQueryParameter("v", protocolVersion.restApiVersion)
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.build()
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)
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.build()
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val response = chain.proceed(newRequest)
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if (response.isSuccessful) {
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val isJson = response.body()?.contentType()?.subtype()?.equals("json", true) ?: false
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if (isJson) {
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tryUpdateProtocolVersion(response)
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}
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}
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return response
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}
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private fun tryUpdateProtocolVersion(response: Response) {
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val content = response.peekBody(DEFAULT_PEEK_BYTE_COUNT).byteStream()
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try {
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val jsonReader = jsonFactory.createParser(content)
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jsonReader.nextToken()
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if (jsonReader.currentToken == JsonToken.START_OBJECT) {
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while (
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jsonReader.currentName != "version" &&
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jsonReader.currentToken != null
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) {
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jsonReader.nextToken()
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}
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val versionStr = jsonReader.nextTextValue()
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if (versionStr != null) {
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try {
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protocolVersion = SubsonicAPIVersions.fromApiVersion(versionStr)
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notifier(protocolVersion)
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} catch (e: IllegalArgumentException) {
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// no-op
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}
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}
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}
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} catch (io: IOException) {
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// no-op
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} catch (parse: JsonParseException) {
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// no-op
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}
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}
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}
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