src/main/kotlin/net/pterodactylus/sone/web/page/FreenetTemplatePage.kt

   1 /*
   2  * Sone - FreenetTemplatePage.java - Copyright © 2010–2019 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.web.page
  19
  20 import freenet.clients.http.*
  21 import net.pterodactylus.sone.main.*
  22 import net.pterodactylus.util.template.*
  23 import net.pterodactylus.util.web.*
  24 import java.lang.String.*
  25 import java.net.*
  26 import java.util.logging.*
  27 import java.util.logging.Logger.*
  28
  29 /**
  30  * Base class for all [Page]s that are rendered with [Template]s and
  31  * fit into Freenet’s web interface.
  32  */
  33 open class FreenetTemplatePage(
  34                 private val templateRenderer: TemplateRenderer,
  35                 loaders: Loaders,
  36                 private val invalidFormPasswordRedirectTarget: String
  37 ) : FreenetPage, LinkEnabledCallback {
  38
  39         private val pageMakerInteractionFactory: PageMakerInteractionFactory = DefaultPageMakerInteractionFactory()
  40         open val styleSheets: Collection<String> = emptySet()
  41         open val shortcutIcon: String? get() = null
  42         open val isFullAccessOnly get() = false
  43
  44         override fun getPath() = toadletPath
  45
  46         open fun getPageTitle(request: FreenetRequest) = ""
  47
  48         override fun isPrefixPage() = false
  49
  50         open fun getRedirectTarget(request: FreenetRequest): String? = null
  51
  52         open fun getAdditionalLinkNodes(request: FreenetRequest): List<Map<String, String>> = emptyList()
  53
  54         override fun isLinkExcepted(link: URI) = false
  55
  56         override fun isEnabled(toadletContext: ToadletContext) = !isFullAccessOnly
  57
  58         private val template = templatePath?.let(loaders::loadTemplate) ?: Template()
  59
  60         override fun handleRequest(request: FreenetRequest, response: Response): Response {
  61                 getRedirectTarget(request)?.let { redirectTarget -> return RedirectResponse(redirectTarget) }
  62
  63                 if (isFullAccessOnly && !request.toadletContext.isAllowedFullAccess) {
  64                         return response.setStatusCode(401).setStatusText("Not authorized").setContentType("text/html")
  65                 }
  66                 val toadletContext = request.toadletContext
  67                 if (request.method == Method.POST) {
  68                         /* require form password. */
  69                         val formPassword = request.httpRequest.getPartAsStringFailsafe("formPassword", 32)
  70                         if (formPassword != toadletContext.container.formPassword) {
  71                                 return RedirectResponse(invalidFormPasswordRedirectTarget)
  72                         }
  73                 }
  74
  75                 val pageMakerInteraction = pageMakerInteractionFactory.createPageMaker(toadletContext, getPageTitle(request))
  76                 styleSheets.forEach(pageMakerInteraction::addStyleSheet)
  77                 getAdditionalLinkNodes(request).forEach(pageMakerInteraction::addLinkNode)
  78                 shortcutIcon?.let(pageMakerInteraction::addShortcutIcon)
  79
  80                 val output = try {
  81                         val start = System.nanoTime()
  82                         templateRenderer.render(template) { templateContext ->
  83                                 processTemplate(request, templateContext)
  84                         }.also {
  85                                 val finish = System.nanoTime()
  86                                 logger.log(Level.FINEST, format("Template was rendered in %.2fms.", (finish - start) / 1000000.0))
  87                         }
  88                 } catch (re1: RedirectException) {
  89                         return RedirectResponse(re1.target ?: "")
  90                 }
  91
  92                 pageMakerInteraction.setContent(output)
  93
  94                 return response.setStatusCode(200).setStatusText("OK").setContentType("text/html").write(pageMakerInteraction.renderPage())
  95         }
  96
  97         open fun processTemplate(request: FreenetRequest, templateContext: TemplateContext) {
  98                 /* do nothing. */
  99         }
 100
 101         class RedirectException(val target: String?) : Exception() {
 102                 override fun toString(): String = format("RedirectException{target='%s'}", target)
 103         }
 104
 105 }
 106
 107 private val logger: Logger = getLogger(FreenetTemplatePage::class.java.name)