/
NinegagSkraper.kt
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/
NinegagSkraper.kt
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/*
* Copyright (c) 2019-present Mikhael Sokolov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ru.sokomishalov.skraper.provider.ninegag
import com.fasterxml.jackson.databind.JsonNode
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow
import org.jsoup.nodes.Document
import ru.sokomishalov.skraper.Skraper
import ru.sokomishalov.skraper.Skrapers
import ru.sokomishalov.skraper.client.HttpRequest
import ru.sokomishalov.skraper.client.SkraperClient
import ru.sokomishalov.skraper.client.fetchDocument
import ru.sokomishalov.skraper.client.fetchOpenGraphMedia
import ru.sokomishalov.skraper.internal.iterable.emitBatch
import ru.sokomishalov.skraper.internal.net.host
import ru.sokomishalov.skraper.internal.number.div
import ru.sokomishalov.skraper.internal.number.minus
import ru.sokomishalov.skraper.internal.serialization.*
import ru.sokomishalov.skraper.internal.string.unescapeJson
import ru.sokomishalov.skraper.model.*
import java.time.Duration
import java.time.Instant
/**
* @author sokomishalov
*/
open class NinegagSkraper @JvmOverloads constructor(
override val client: SkraperClient = Skrapers.client
) : Skraper {
override fun getPosts(path: String): Flow<Post> = flow {
var nextPath = path
while (true) {
val page = getUserPage(path = nextPath)
val dataJson = page.extractJsonData()
val rawPosts = dataJson?.getByPath("data.posts")
if (rawPosts == null || rawPosts.isEmpty) break
emitBatch(rawPosts) {
Post(
id = getString("id").orEmpty(),
text = getString("title"),
publishedAt = getLong("creationTs")?.let { Instant.ofEpochSecond(it) },
statistics = PostStatistics(
likes = getInt("upVoteCount") - getInt("downVoteCount"),
comments = getInt("commentsCount"),
),
media = extractPostMediaItems()
)
}
nextPath = "${path.substringBefore("?")}?${dataJson.getString("data.nextCursor").orEmpty()}"
}
}
override suspend fun getPageInfo(path: String): PageInfo? {
val page = getUserPage(path = path)
val dataJson = page.extractJsonData()
return dataJson?.getByPath("data.posts.0.postSection")?.run {
PageInfo(
nick = getString("url")?.substringAfterLast("/"),
name = getString("name"),
avatar = getString("imageUrl")?.toImage()
)
}
}
override fun supports(url: String): Boolean {
return "9gag.com" in url.host
}
override suspend fun resolve(media: Media): Media {
return when (media) {
is Video -> {
val page = client.fetchDocument(HttpRequest(media.url))
return page
?.extractJsonData()
?.getByPath("data.post")
?.extractPostMediaItems()
?.find { it is Video }
?: media
}
else -> client.fetchOpenGraphMedia(media)
}
}
private suspend fun getUserPage(path: String): Document? {
return client.fetchDocument(HttpRequest(url = BASE_URL.buildFullURL(path = path)))
}
private fun Document?.extractJsonData(): JsonNode? {
return this
?.getElementsByTag("script")
?.firstOrNull { it.html().startsWith("window._config") }
?.html()
?.removePrefix("window._config = JSON.parse(\"")
?.removeSuffix("\");")
?.unescapeJson()
?.readJsonNodes()
}
private fun JsonNode.extractPostMediaItems(): List<Media> {
return when {
getInt("images.image460sv.duration") != null -> listOf(Video(
url = getString("images.image460sv.url").orEmpty(),
aspectRatio = getByPath("images.image460sv")?.run {
getDouble("width") / getDouble("height")
},
duration = getLong("images.image460sv.duration")?.run {
Duration.ofSeconds(this)
}
))
else -> listOf(Image(
url = getString("images.image460.url").orEmpty(),
aspectRatio = getByPath("images.image460")?.run {
getDouble("width") / getDouble("height")
}
))
}
}
companion object {
const val BASE_URL: String = "https://9gag.com"
}
}