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package mx.trackermap.TrackerMap.client.infrastructure
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.request.*
import io.ktor.client.statement.*
import io.ktor.http.*
import io.ktor.util.*
import java.io.File
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 ApiXmlMediaType = "application/xml"
val client: HttpClient = HttpClient(CIO) {
install(JsonFeature)
}
val defaultHeaders: Map<String, String> =
mapOf(
ApiContentType to ApiJsonMediaType,
ApiAccept to ApiJsonMediaType)
val jsonHeaders: Map<String, String> =
mapOf(
ApiContentType to ApiJsonMediaType,
ApiAccept to ApiJsonMediaType)
}
protected inline fun <reified T> fillRequest(requestBuilder: HttpRequestBuilder, content: T, mediaType: String = ApiJsonMediaType) {
when {
content is File -> TODO("i don't know what to do here.")
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 == 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(requestConfig.path.trimStart('/'))
requestConfig.query.forEach { query ->
query.value.forEach { queryValue ->
urlBuilder.parameters.append(query.key, queryValue)
}
}
val url = urlBuilder.build()
val headers = requestConfig.headers + defaultHeaders
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
}
}
headers.forEach { header ->
request.headers[header.key] = header.value
}
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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