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/*
* Copyright 2018 Allan Wang
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.pitchedapps.frost.facebook.requests
import com.pitchedapps.frost.BuildConfig
import com.pitchedapps.frost.facebook.FB_DTSG_MATCHER
import com.pitchedapps.frost.facebook.FB_JSON_URL_MATCHER
import com.pitchedapps.frost.facebook.FB_REV_MATCHER
import com.pitchedapps.frost.facebook.FB_URL_BASE
import com.pitchedapps.frost.facebook.FB_USER_MATCHER
import com.pitchedapps.frost.facebook.USER_AGENT
import com.pitchedapps.frost.facebook.get
import com.pitchedapps.frost.kotlin.Flyweight
import com.pitchedapps.frost.utils.L
import kotlinx.coroutines.GlobalScope
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.
*/
val fbAuth = Flyweight<String, RequestAuth>(GlobalScope, 3600000 /* an hour */) {
it.getAuth()
}
/**
* Underlying container for all fb requests
*/
data class RequestAuth(
val userId: Long = -1,
val cookie: String = "",
val fb_dtsg: String = "",
val rev: String = ""
) {
val isComplete
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)
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 { lines ->
lines.forEach {
val text = try {
StringEscapeUtils.unescapeEcmaScript(it)
} catch (ignore: Exception) {
return@forEach
}
val fb_dtsg = FB_DTSG_MATCHER.find(text)[1]
if (fb_dtsg != null) {
auth = auth.copy(fb_dtsg = fb_dtsg)
if (auth.isComplete) return auth
}
val rev = FB_REV_MATCHER.find(text)[1]
if (rev != null) {
auth = auth.copy(rev = rev)
if (auth.isComplete) return auth
}
}
}
return auth
}
/**
* 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 { lines ->
lines.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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