Let's make (git) history!

handlers/handlerhistory.cpp

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+/* Copyright (c) 2018 Albert S.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+#include "handlerhistory.h"
+#include "handler.h"
+#include "../htmllink.h"
+#include "../logger.h"
+#include "../database/exceptions.h"
+Response HandlerHistory::handle(const Request &r)
+{
+	QueryOption qo = queryOption(r);
+	std::string page = r.get("page");
+
+	unsigned int count = 0;
+	std::vector<Revision> resultList;
+	auto revisionDao = this->database->createRevisionDao();
+
+	auto makeSortedLink = [&](unsigned int limit, unsigned int offset, unsigned int order) {
+		if(!page.empty())
+		{
+			return this->urlProvider->pageHistorySort(page, limit, offset, order);
+		}
+		return this->urlProvider->recentSorted(limit, offset, order);
+	};
+	std::string templatename = "recentchanges";
+	try
+	{
+		if(!page.empty())
+		{
+			auto pageDao = this->database->createPageDao();
+			if(!pageDao->exists(page))
+			{
+				return errorResponse("No such page", "No such page exists to show history for", 404);
+			}
+			count = revisionDao->countTotalRevisions(page);
+			resultList = revisionDao->getAllRevisionsForPage(page, qo);
+			templatename = "page_history";
+		}
+		else
+		{
+			count = revisionDao->countTotalRevisions();
+			if(count == 0)
+			{
+				return errorResponse("No revisions", "This wiki does not have any pages with revisions yet");
+			}
+			resultList = revisionDao->getAllRevisions(qo);
+		}
+	}
+	catch(const DatabaseException &e)
+	{
+		Logger::error() << "DatabaseException in handlerhistory: " << e.what();
+		return errorResponse("Database error", "While trying to fetch revision list, a database error occured");
+	}
+	TemplatePage historyPage = this->templ->getPage(templatename);
+	setGeneralVars(historyPage);
+
+	if((qo.offset + (unsigned int)resultList.size()) < count)
+	{
+		HtmlLink link;
+		link.href = makeSortedLink(qo.limit, qo.offset + qo.limit, qo.order);
+		link.innervalue = "Next page";
+
+		historyPage.setVar("nextpage", link.render());
+	}
+
+	unsigned int prevoffset = qo.offset - qo.limit;
+	if(prevoffset > count)
+	{
+		prevoffset = 0;
+	}
+	if(qo.offset > 0 && qo.offset < count)
+	{
+		HtmlLink link;
+		link.href = makeSortedLink(qo.limit, prevoffset, qo.order);
+		link.innervalue = "Previous page";
+
+		historyPage.setVar("prevpage", link.render());
+	}
+
+	unsigned int neworder = (qo.order == DESCENDING) ? ASCENDING : DESCENDING;
+	historyPage.setVar("linkrecentsort", makeSortedLink(qo.limit, qo.offset, neworder));
+	historyPage.setVar("revisionlist", this->templ->renderRevisionList(resultList, page.empty()));
+	Response response;
+	response.setBody(historyPage.render());
+	response.setStatus(200);
+	return response;
+}