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package mx.trackermap.TrackerMap.client.infrastructure
import com.russhwolf.settings.Settings
import com.russhwolf.settings.string
import io.ktor.client.*
import io.ktor.client.call.*
import io.ktor.client.engine.cio.*
import io.ktor.client.features.json.*
import io.ktor.client.features.json.serializer.KotlinxSerializer
import io.ktor.client.features.logging.DEFAULT
import io.ktor.client.features.logging.LogLevel
import io.ktor.client.features.logging.Logger
import io.ktor.client.features.logging.Logging
import io.ktor.client.request.*
import io.ktor.client.request.forms.FormDataContent
import io.ktor.client.statement.*
import io.ktor.http.*
import io.ktor.util.*
import mx.trackermap.TrackerMap.client.apis.ACCESS_TOKEN_KEY
import kotlinx.serialization.json.Json as KotlinJson
open class ApiClient(val baseUrl: String) {
companion object {
protected const val ApiContentType = "Content-Type"
protected const val ApiAccept = "Accept"
protected const val ApiJsonMediaType = "application/json"
protected const val ApiFormDataMediaType = "multipart/form-data"
protected const val ApiFormURLType = "application/x-www-form-urlencoded"
protected const val ApiXmlMediaType = "application/xml"
val client: HttpClient = HttpClient(CIO) {
install(JsonFeature) {
serializer = KotlinxSerializer(
KotlinJson {
ignoreUnknownKeys = true
}
)
}
install(Logging) {
logger = Logger.DEFAULT
level = LogLevel.ALL
}
engine {
requestTimeout = 20_000
}
}
val defaultHeaders: Map<String, String> =
mapOf(
ApiContentType to ApiJsonMediaType,
ApiAccept to ApiJsonMediaType
)
val jsonHeaders: Map<String, String> =
mapOf(
ApiContentType to ApiJsonMediaType,
ApiAccept to ApiJsonMediaType
)
}
var token: String = ""
init {
val settings = Settings()
token = settings.getString(ACCESS_TOKEN_KEY, "")
}
protected inline fun <reified T> fillRequest(
requestBuilder: HttpRequestBuilder,
content: T,
mediaType: String = ApiJsonMediaType
) {
when {
mediaType == ApiFormDataMediaType && content is Map<*, *> -> {
val parametersBuilder = ParametersBuilder()
content.forEach { map ->
if (map.key is String && map.value is String) {
parametersBuilder[map.key as String] = map.value as String
}
}
parametersBuilder.build()
requestBuilder.contentType(ContentType.MultiPart.FormData)
requestBuilder.body = parametersBuilder
}
mediaType == ApiJsonMediaType -> {
requestBuilder.contentType(ContentType.Application.Json)
if (content != null) {
requestBuilder.body = content
}
}
mediaType == ApiFormURLType && content is Map<*, *> -> {
val parametersBuilder = ParametersBuilder()
content.forEach { item ->
parametersBuilder[item.key as String] = item.value as String
}
requestBuilder.body = FormDataContent(parametersBuilder.build())
}
mediaType == ApiXmlMediaType -> TODO("xml not currently supported.")
// TODO: this should be extended with other serializers
else -> TODO("requestBody currently only supports JSON body and File body.")
}
}
protected suspend inline fun <reified T : Any?> request(
requestConfig: RequestConfig,
body: Any? = null
): ApiInfrastructureResponse<T?> {
val httpUrl: Url
try {
httpUrl = Url(baseUrl)
} catch (e: URLDecodeException) {
throw IllegalStateException("baseUrl is invalid.")
}
val urlBuilder = URLBuilder(httpUrl)
.path("${httpUrl.encodedPath.trimStart('/')}${requestConfig.path}")
requestConfig.query.forEach { query ->
query.value.forEach { queryValue ->
urlBuilder.parameters.append(query.key, queryValue)
}
}
val url = urlBuilder.build()
val headers = defaultHeaders + requestConfig.headers
if (headers[ApiContentType] ?: "" == "") {
throw IllegalStateException("Missing Content-Type header. This is required.")
}
if (headers[ApiAccept] ?: "" == "") {
throw IllegalStateException("Missing Accept header. This is required.")
}
// TODO: support multiple contentType,accept options here.
val contentType = (headers[ApiContentType] as String).substringBefore(";").lowercase()
val accept = (headers[ApiAccept] as String).substringBefore(";").lowercase()
val request = HttpRequestBuilder()
request.url(url)
request.accept(ContentType.parse(accept))
when (requestConfig.method) {
RequestMethod.DELETE -> {
request.method = HttpMethod.Delete
}
RequestMethod.GET -> {
request.method = HttpMethod.Get
}
RequestMethod.HEAD -> {
request.method = HttpMethod.Head
}
RequestMethod.PATCH -> {
request.method = HttpMethod.Patch
fillRequest(request, body, contentType)
}
RequestMethod.PUT -> {
request.method = HttpMethod.Put
fillRequest(request, body, contentType)
}
RequestMethod.POST -> {
request.method = HttpMethod.Post
fillRequest(request, body, contentType)
}
RequestMethod.OPTIONS -> {
request.method = HttpMethod.Options
}
}
if (token.isNotEmpty()) {
request.headers["Cookie"] = token
}
val response: HttpResponse = client.request(request)
// TODO: handle specific mapping types. e.g. Map<int, Class<?>>
when (response.status.value) {
in 300..399 -> return Redirection(
response.status.value,
response.headers.toMap()
)
in 100..199 -> return Informational(
response.status.description,
response.status.value,
response.headers.toMap()
)
in 200..299 -> return Success(
response.receive(),
response.status.value,
response.headers.toMap()
)
in 400..499 -> return ClientError(
response.receive(),
response.status.value,
response.headers.toMap()
)
else -> return ServerError(
null,
response.receive(),
response.status.value,
response.headers.toMap()
)
}
}
}
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