src/main/kotlin/net/pterodactylus/sone/web/pages/SearchPage.kt

   1 package net.pterodactylus.sone.web.pages
   2
   3 import com.google.common.base.Ticker
   4 import com.google.common.cache.*
   5 import freenet.support.*
   6 import net.pterodactylus.sone.data.*
   7 import net.pterodactylus.sone.main.*
   8 import net.pterodactylus.sone.utils.*
   9 import net.pterodactylus.sone.web.*
  10 import net.pterodactylus.sone.web.page.*
  11 import net.pterodactylus.sone.web.pages.SearchPage.Optionality.*
  12 import net.pterodactylus.util.template.*
  13 import net.pterodactylus.util.text.*
  14 import java.util.concurrent.TimeUnit.*
  15 import javax.inject.*
  16
  17 /**
  18  * This page lets the user search for posts and replies that contain certain
  19  * words.
  20  */
  21 @TemplatePath("/templates/search.html")
  22 class SearchPage(webInterface: WebInterface, loaders: Loaders, templateRenderer: TemplateRenderer, ticker: Ticker = Ticker.systemTicker()) :
  23                 SoneTemplatePage("search.html", webInterface, loaders, templateRenderer, pageTitleKey = "Page.Search.Title") {
  24
  25         @Inject
  26         constructor(webInterface: WebInterface, loaders: Loaders, templateRenderer: TemplateRenderer) :
  27                         this(webInterface, loaders, templateRenderer, Ticker.systemTicker())
  28
  29         private val cache: Cache<Iterable<Phrase>, Pagination<Post>> = CacheBuilder.newBuilder().ticker(ticker).expireAfterAccess(5, MINUTES).build()
  30
  31         override fun handleRequest(soneRequest: SoneRequest, templateContext: TemplateContext) {
  32                 val startTime = System.currentTimeMillis()
  33                 val phrases = try {
  34                         soneRequest.parameters["query"].emptyToNull?.parse()
  35                 } catch (te: TextException) {
  36                         redirect("index.html")
  37                 }
  38                                 ?: redirect("index.html")
  39
  40                 when (phrases.size) {
  41                         0 -> redirect("index.html")
  42                         1 -> phrases.first().phrase.also { word ->
  43                                 when {
  44                                         word.removePrefix("sone://").let(soneRequest.core::getSone) != null -> redirect("viewSone.html?sone=${word.removePrefix("sone://")}")
  45                                         word.removePrefix("post://").let(soneRequest.core::getPost) != null -> redirect("viewPost.html?post=${word.removePrefix("post://")}")
  46                                         word.removePrefix("reply://").let(soneRequest.core::getPostReply) != null -> redirect("viewPost.html?post=${word.removePrefix("reply://").let(soneRequest.core::getPostReply)?.postId}")
  47                                         word.removePrefix("album://").let(soneRequest.core::getAlbum) != null -> redirect("imageBrowser.html?album=${word.removePrefix("album://")}")
  48                                         word.removePrefix("image://").let { soneRequest.core.getImage(it, false) } != null -> redirect("imageBrowser.html?image=${word.removePrefix("image://")}")
  49                                 }
  50                         }
  51                 }
  52
  53                 val soneNameCache = { sone: Sone -> sone.names() }.memoize()
  54                 val sonePagination = soneRequest.core.sones
  55                                 .scoreAndPaginate(phrases, soneRequest.core.preferences.postsPerPage) { it.allText(soneNameCache) }
  56                                 .apply { page = soneRequest.parameters["sonePage"].emptyToNull?.toIntOrNull() ?: 0 }
  57                 val postPagination = cache.get(phrases) {
  58                         soneRequest.core.sones
  59                                         .flatMap(Sone::getPosts)
  60                                         .filter { Post.FUTURE_POSTS_FILTER.apply(it) }
  61                                         .scoreAndPaginate(phrases, soneRequest.core.preferences.postsPerPage) { it.allText(soneNameCache, soneRequest.core::getReplies) }
  62                 }.apply { page = soneRequest.parameters["postPage"].emptyToNull?.toIntOrNull() ?: 0 }
  63
  64                 Logger.normal(SearchPage::class.java, "Finished search for “${soneRequest.parameters["query"]}” in ${System.currentTimeMillis() - startTime}ms.")
  65                 templateContext["sonePagination"] = sonePagination
  66                 templateContext["soneHits"] = sonePagination.items
  67                 templateContext["postPagination"] = postPagination
  68                 templateContext["postHits"] = postPagination.items
  69         }
  70
  71         private fun <T> Iterable<T>.scoreAndPaginate(phrases: Iterable<Phrase>, postsPerPage: Int, texter: (T) -> String) =
  72                         map { it to score(texter(it), phrases) }
  73                                         .filter { it.second > 0 }
  74                                         .sortedByDescending { it.second }
  75                                         .map { it.first }
  76                                         .paginate(postsPerPage)
  77
  78         private fun Sone.names() =
  79                         with(profile) {
  80                                 listOf(name, firstName, middleName, lastName)
  81                                                 .filterNotNull()
  82                                                 .joinToString("")
  83                         }
  84
  85         private fun Sone.allText(soneNameCache: (Sone) -> String) =
  86                         (soneNameCache(this) + profile.fields.map { "${it.name} ${it.value}" }.joinToString(" ", " ")).toLowerCase()
  87
  88         private fun Post.allText(soneNameCache: (Sone) -> String, getReplies: (String) -> Collection<PostReply>) =
  89                         (text + recipient.orNull()?.let { " ${soneNameCache(it)}" } + getReplies(id)
  90                                         .filter { PostReply.FUTURE_REPLY_FILTER.apply(it) }
  91                                         .map { "${soneNameCache(it.sone)} ${it.text}" }.joinToString(" ", " ")).toLowerCase()
  92
  93         private fun Iterable<Phrase>.indicesFor(text: String, predicate: (Phrase) -> Boolean) =
  94                         filter(predicate).map(Phrase::phrase).map(String::toLowerCase).flatMap { text.findAll(it) }
  95
  96         private fun score(text: String, phrases: Iterable<Phrase>): Double {
  97                 val requiredPhrases = phrases.count { it.required }
  98                 val requiredHits = phrases.indicesFor(text, Phrase::required)
  99                                 .map { Math.pow(1 - it / text.length.toDouble(), 2.0) }
 100                                 .sum()
 101                 val optionalHits = phrases.indicesFor(text, Phrase::optional)
 102                                 .map { Math.pow(1 - it / text.length.toDouble(), 2.0) }
 103                                 .sum()
 104                 val forbiddenHits = phrases.indicesFor(text, Phrase::forbidden)
 105                                 .count()
 106                 return requiredHits * 3 + optionalHits + (requiredHits - requiredPhrases) * 5 - (forbiddenHits * 2)
 107         }
 108
 109         private fun String.findAll(needle: String) =
 110                         generateSequence(indexOf(needle).takeIf { it > -1 }) { lastPosition ->
 111                                 lastPosition
 112                                                 .let { indexOf(needle, it + 1) }
 113                                                 .takeIf { it > -1 }
 114                         }.toList()
 115
 116         private fun String.parse() =
 117                         StringEscaper.parseLine(this)
 118                                         .map {
 119                                                 when {
 120                                                         it == "+" || it == "-" -> Phrase(it, OPTIONAL)
 121                                                         it.startsWith("+") -> Phrase(it.drop(1), REQUIRED)
 122                                                         it.startsWith("-") -> Phrase(it.drop(1), FORBIDDEN)
 123                                                         else -> Phrase(it, OPTIONAL)
 124                                                 }
 125                                         }
 126
 127         private fun redirect(target: String): Nothing = throw RedirectException(target)
 128
 129         enum class Optionality {
 130                 OPTIONAL,
 131                 REQUIRED,
 132                 FORBIDDEN
 133         }
 134
 135         private data class Phrase(val phrase: String, val optionality: Optionality) {
 136                 val required = optionality == REQUIRED
 137                 val forbidden = optionality == FORBIDDEN
 138                 val optional = optionality == OPTIONAL
 139         }
 140
 141 }