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package com.pitchedapps.frost.facebook.requests
import com.pitchedapps.frost.BuildConfig
import com.pitchedapps.frost.facebook.*
import com.pitchedapps.frost.rx.RxFlyweight
import com.pitchedapps.frost.utils.L
import io.reactivex.Single
import io.reactivex.schedulers.Schedulers
import okhttp3.Call
import okhttp3.FormBody
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.logging.HttpLoggingInterceptor
import org.apache.commons.text.StringEscapeUtils
/**
* Created by Allan Wang on 21/12/17.
*/
private class RxAuth : RxFlyweight<String, Long, RequestAuth>() {
override fun call(input: String) = input.getAuth()
override fun validate(input: String, cond: Long) =
System.currentTimeMillis() - cond < 3600000 // valid for an hour
override fun cache(input: String) = System.currentTimeMillis()
}
private val auth = RxAuth()
/**
* Synchronously fetch [RequestAuth] from cookie
* [action] will only be called if a valid auth is found.
* Otherwise, [fail] will be called
*/
fun String?.fbRequest(fail: () -> Unit = {}, action: RequestAuth.() -> Unit) {
if (this == null) return fail()
try {
val auth = auth(this).blockingGet()
auth.action()
} catch (e: Exception) {
L.e { "Failed auth for ${hashCode()}: ${e.message}" }
fail()
}
}
/**
* Underlying container for all fb requests
*/
data class RequestAuth(val userId: Long = -1,
val cookie: String = "",
val fb_dtsg: String = "",
val rev: String = "") {
val isValid
get() = userId > 0 && cookie.isNotEmpty() && fb_dtsg.isNotEmpty() && rev.isNotEmpty()
}
/**
* Request container with the execution call
*/
class FrostRequest<out T : Any?>(val call: Call, private val invoke: (Call) -> T) {
fun invoke() = invoke(call)
}
internal inline fun <T : Any?> RequestAuth.frostRequest(
noinline invoke: (Call) -> T,
builder: Request.Builder.() -> Request.Builder // to ensure we don't do anything extra at the end
): FrostRequest<T> {
val request = cookie.requestBuilder()
request.builder()
return FrostRequest(request.call(), invoke)
}
val httpClient: OkHttpClient by lazy {
val builder = OkHttpClient.Builder()
if (BuildConfig.DEBUG)
builder.addInterceptor(HttpLoggingInterceptor()
.setLevel(HttpLoggingInterceptor.Level.BASIC))
builder.build()
}
internal fun List<Pair<String, Any?>>.toForm(): FormBody {
val builder = FormBody.Builder()
forEach { (key, value) ->
val v = value?.toString() ?: ""
builder.add(key, v)
}
return builder.build()
}
internal fun List<Pair<String, Any?>>.withEmptyData(vararg key: String): List<Pair<String, Any?>> {
val newList = toMutableList()
newList.addAll(key.map { it to null })
return newList
}
internal fun String?.requestBuilder(): Request.Builder {
val builder = Request.Builder()
.header("User-Agent", USER_AGENT_BASIC)
if (this != null)
builder.header("Cookie", this)
// .cacheControl(CacheControl.FORCE_NETWORK)
return builder
}
fun Request.Builder.call(): Call = httpClient.newCall(build())
fun String.getAuth(): RequestAuth {
L.v { "Getting auth for ${hashCode()}" }
var auth = RequestAuth(cookie = this)
val id = FB_USER_MATCHER.find(this)[1]?.toLong() ?: return auth
auth = auth.copy(userId = id)
val call = this.requestBuilder()
.url(FB_URL_BASE)
.get()
.call()
call.execute().body()?.charStream()?.useLines {
it.forEach {
val text = StringEscapeUtils.unescapeEcmaScript(it)
val fb_dtsg = FB_DTSG_MATCHER.find(text)[1]
if (fb_dtsg != null) {
auth = auth.copy(fb_dtsg = fb_dtsg)
if (auth.isValid) return auth
}
val rev = FB_REV_MATCHER.find(text)[1]
if (rev != null) {
auth = auth.copy(rev = rev)
if (auth.isValid) return auth
}
}
}
return auth
}
inline fun <T, reified R : Any, O> Array<T>.zip(crossinline mapper: (List<R>) -> O,
crossinline caller: (T) -> R): Single<O> {
if (isEmpty())
return Single.just(mapper(emptyList()))
val singles = map { Single.fromCallable { caller(it) }.subscribeOn(Schedulers.io()) }
return Single.zip(singles) {
val results = it.mapNotNull { it as? R }
mapper(results)
}
}
/**
* Execute the call and attempt to check validity
* Valid = not blank & no "error" instance
*/
fun executeForNoError(call: Call): Boolean {
val body = call.execute().body() ?: return false
var empty = true
body.charStream().useLines {
it.forEach {
if (it.contains("error")) return false
if (empty && it.isNotEmpty()) empty = false
}
}
return !empty
}
fun getJsonUrl(call: Call): String? {
val body = call.execute().body() ?: return null
val url = FB_JSON_URL_MATCHER.find(body.string())[1] ?: return null
return StringEscapeUtils.unescapeEcmaScript(url)
}
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