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