♻️ Replace FreenetTemplatePage with Kotlin version

[Sone.git] / src / main / kotlin / net / pterodactylus / sone / web / page / FreenetTemplatePage.kt

diff --git a/src/main/kotlin/net/pterodactylus/sone/web/page/FreenetTemplatePage.kt b/src/main/kotlin/net/pterodactylus/sone/web/page/FreenetTemplatePage.kt
new file mode 100644 (file)
index 0000000..d93e7d1
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/web/page/FreenetTemplatePage.kt
@@ -0,0 +1,113 @@
+/*
+ * Sone - FreenetTemplatePage.java - Copyright © 2010–2019 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.web.page
+
+import freenet.clients.http.*
+import net.pterodactylus.sone.main.*
+import net.pterodactylus.util.template.*
+import net.pterodactylus.util.web.*
+import java.io.*
+import java.lang.String.*
+import java.net.*
+import java.util.logging.*
+import java.util.logging.Logger.*
+
+/**
+ * Base class for all [Page]s that are rendered with [Template]s and
+ * fit into Freenet’s web interface.
+ */
+open class FreenetTemplatePage(
+               private val path: String,
+               private val templateContextFactory: TemplateContextFactory,
+               private val loaders: Loaders,
+               private val template: Template,
+               private val invalidFormPasswordRedirectTarget: String
+) : FreenetPage, LinkEnabledCallback {
+
+       open val styleSheets: Collection<String> = emptySet()
+       open val shortcutIcon: String? get() = null
+       open val isFullAccessOnly get() = false
+
+       override fun getPath() = path
+
+       open fun getPageTitle(request: FreenetRequest) = ""
+
+       override fun isPrefixPage() = false
+
+       open fun getRedirectTarget(request: FreenetRequest): String? = null
+
+       open fun getAdditionalLinkNodes(request: FreenetRequest): List<Map<String, String>> = emptyList()
+
+       override fun isLinkExcepted(link: URI) = false
+
+       override fun isEnabled(toadletContext: ToadletContext) = !isFullAccessOnly
+
+       override fun handleRequest(request: FreenetRequest, response: Response): Response {
+               getRedirectTarget(request)?.let { redirectTarget -> return RedirectResponse(redirectTarget) }
+
+               if (isFullAccessOnly && !request.toadletContext.isAllowedFullAccess) {
+                       return response.setStatusCode(401).setStatusText("Not authorized").setContentType("text/html")
+               }
+               val toadletContext = request.toadletContext
+               if (request.method == Method.POST) {
+                       /* require form password. */
+                       val formPassword = request.httpRequest.getPartAsStringFailsafe("formPassword", 32)
+                       if (formPassword != toadletContext.container.formPassword) {
+                               return RedirectResponse(invalidFormPasswordRedirectTarget)
+                       }
+               }
+               val pageMaker = toadletContext.pageMaker
+               val pageNode = pageMaker.getPageNode(getPageTitle(request), toadletContext)
+
+               styleSheets.forEach(pageNode::addCustomStyleSheet)
+               getAdditionalLinkNodes(request)
+                               .map { it to pageNode.headNode.addChild("link") }
+                               .forEach { (linkNodeParameters, linkNode) ->
+                                       linkNodeParameters.forEach(linkNode::addAttribute)
+                               }
+               shortcutIcon?.let { pageNode.addForwardLink("icon", it) }
+
+               val templateContext = templateContextFactory.createTemplateContext()
+               templateContext.mergeContext(template.initialContext)
+               try {
+                       val start = System.nanoTime()
+                       processTemplate(request, templateContext)
+                       val finish = System.nanoTime()
+                       logger.log(Level.FINEST, format("Template was rendered in %.2fms.", (finish - start) / 1000000.0))
+               } catch (re1: RedirectException) {
+                       return RedirectResponse(re1.target ?: "")
+               }
+
+               val stringWriter = StringWriter()
+               template.render(templateContext, stringWriter)
+               pageNode.content.addChild("%", stringWriter.toString())
+
+               return response.setStatusCode(200).setStatusText("OK").setContentType("text/html").write(pageNode.outer.generate())
+       }
+
+       open fun processTemplate(request: FreenetRequest, templateContext: TemplateContext) {
+               /* do nothing. */
+       }
+
+       class RedirectException(val target: String?) : Exception() {
+               override fun toString(): String = format("RedirectException{target='%s'}", target)
+       }
+
+}
+
+private val logger: Logger = getLogger(FreenetTemplatePage::class.java.name)