src/main/kotlin/net/pterodactylus/sone/template/RenderFilter.kt

   1 package net.pterodactylus.sone.template
   2
   3 import net.pterodactylus.sone.core.Core
   4 import net.pterodactylus.sone.text.FreemailPart
   5 import net.pterodactylus.sone.text.FreenetLinkPart
   6 import net.pterodactylus.sone.text.LinkPart
   7 import net.pterodactylus.sone.text.Part
   8 import net.pterodactylus.sone.text.PlainTextPart
   9 import net.pterodactylus.sone.text.PostPart
  10 import net.pterodactylus.sone.text.SonePart
  11 import net.pterodactylus.sone.text.SoneTextParser
  12 import net.pterodactylus.sone.text.SoneTextParserContext
  13 import net.pterodactylus.sone.utils.asTemplate
  14 import net.pterodactylus.util.template.Filter
  15 import net.pterodactylus.util.template.TemplateContext
  16 import net.pterodactylus.util.template.TemplateContextFactory
  17 import java.io.StringWriter
  18 import java.io.Writer
  19 import java.net.URLEncoder
  20
  21 /**
  22  * Renders a number of pre-parsed [Part] into a [String].
  23  *
  24  * @author [David ‘Bombe’ Roden](mailto:bombe@pterodactylus.net)
  25  */
  26 class RenderFilter(private val core: Core, private val templateContextFactory: TemplateContextFactory) : Filter {
  27
  28         companion object {
  29                 private val plainTextTemplate = "<%text|html>".asTemplate()
  30                 private val linkTemplate = "<a class=\"<%cssClass|html>\" href=\"<%link|html>\" title=\"<%title|html>\"><%text|html></a>".asTemplate()
  31         }
  32
  33         override fun format(templateContext: TemplateContext?, data: Any?, parameters: MutableMap<String, Any?>?): Any? {
  34                 @Suppress("UNCHECKED_CAST")
  35                 val parts = data as? Iterable<Part> ?: return null
  36                 val parsedTextWriter = StringWriter()
  37                 render(parsedTextWriter, parts)
  38                 return parsedTextWriter.toString()
  39         }
  40
  41         private fun render(writer: Writer, parts: Iterable<Part>) {
  42                 parts.forEach { render(writer, it) }
  43         }
  44
  45         private fun render(writer: Writer, part: Part) {
  46                 @Suppress("UNCHECKED_CAST")
  47                 when (part) {
  48                         is PlainTextPart -> render(writer, part)
  49                         is FreenetLinkPart -> render(writer, part)
  50                         is LinkPart -> render(writer, part)
  51                         is SonePart -> render(writer, part)
  52                         is PostPart -> render(writer, part)
  53                         is FreemailPart -> render(writer, part)
  54                 }
  55         }
  56
  57         private fun render(writer: Writer, plainTextPart: PlainTextPart) {
  58                 val templateContext = templateContextFactory.createTemplateContext()
  59                 templateContext.set("text", plainTextPart.text)
  60                 plainTextTemplate.render(templateContext, writer)
  61         }
  62
  63         private fun render(writer: Writer, freenetLinkPart: FreenetLinkPart) {
  64                 renderLink(writer, "/${freenetLinkPart.link}", freenetLinkPart.text, freenetLinkPart.title, if (freenetLinkPart.trusted) "freenet-trusted" else "freenet")
  65         }
  66
  67         private fun render(writer: Writer, linkPart: LinkPart) {
  68                 renderLink(writer, "/external-link/?_CHECKED_HTTP_=${linkPart.link.urlEncode()}", linkPart.text, linkPart.title, "internet")
  69         }
  70
  71         private fun String.urlEncode(): String = URLEncoder.encode(this, "UTF-8")
  72
  73         private fun render(writer: Writer, sonePart: SonePart) {
  74                 if (sonePart.sone.name != null) {
  75                         renderLink(writer, "viewSone.html?sone=${sonePart.sone.id}", SoneAccessor.getNiceName(sonePart.sone), SoneAccessor.getNiceName(sonePart.sone), "in-sone")
  76                 } else {
  77                         renderLink(writer, "/WebOfTrust/ShowIdentity?id=${sonePart.sone.id}", sonePart.sone.id, sonePart.sone.id, "in-sone")
  78                 }
  79         }
  80
  81         private fun render(writer: Writer, postPart: PostPart) {
  82                 val parser = SoneTextParser(core, core)
  83                 val parserContext = SoneTextParserContext(postPart.post.sone)
  84                 val parts = parser.parse(postPart.post.text, parserContext)
  85                 val excerpt = StringBuilder()
  86                 for (part in parts) {
  87                         excerpt.append(part.text)
  88                         if (excerpt.length > 20) {
  89                                 val lastSpace = excerpt.lastIndexOf(" ", 20)
  90                                 if (lastSpace > -1) {
  91                                         excerpt.setLength(lastSpace)
  92                                 } else {
  93                                         excerpt.setLength(20)
  94                                 }
  95                                 excerpt.append("…")
  96                                 break
  97                         }
  98                 }
  99                 renderLink(writer, "viewPost.html?post=${postPart.post.id}", excerpt.toString(), SoneAccessor.getNiceName(postPart.post.sone), "in-sone")
 100         }
 101
 102         private fun render(writer: Writer, freemailPart: FreemailPart) {
 103                 val sone = core.getSone(freemailPart.identityId)
 104                 val soneName = sone.transform(SoneAccessor::getNiceName).or(freemailPart.identityId)
 105                 renderLink(writer,
 106                                 "/Freemail/NewMessage?to=${freemailPart.identityId}",
 107                                 "${freemailPart.emailLocalPart}@$soneName.freemail",
 108                                 "$soneName\n${freemailPart.emailLocalPart}@${freemailPart.freemailId}.freemail",
 109                                 "in-sone")
 110         }
 111
 112         private fun renderLink(writer: Writer, link: String, text: String, title: String, cssClass: String) {
 113                 val templateContext = templateContextFactory.createTemplateContext()
 114                 templateContext["cssClass"] = cssClass
 115                 templateContext["link"] = link
 116                 templateContext["text"] = text
 117                 templateContext["title"] = title
 118                 linkTemplate.render(templateContext, writer)
 119         }
 120
 121 }