From 40506bc32efca98b43a72202d0823cdd3c8b2c05 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Fri, 10 Feb 2023 18:02:40 +0100
Subject: Add download Markdown as PDF

---
 debian/changelog    |  5 +++--
 debian/control      |  2 +-
 html/index.html     |  1 +
 html/whiteboard.css | 14 ++++++++++++++
 html/whiteboard.js  | 15 +++++++++++++++
 whiteboard.cpp      | 13 +++++++++++++
 6 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index ab688ed..d773faf 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,9 +1,10 @@
-whiteboard (1.7) UNRELEASED; urgency=medium
+whiteboard (1.7) unstable; urgency=medium
 
   * Fix crash on stats.html page reload/close
   * Focus on reconnect button
+  * Added Markdown to PDF download via pandoc
 
- -- Roland Reichwein <mail@reichwein.it>  Wed, 08 Feb 2023 18:22:26 +0100
+ -- Roland Reichwein <mail@reichwein.it>  Fri, 10 Feb 2023 18:01:37 +0100
 
 whiteboard (1.6) unstable; urgency=medium
 
diff --git a/debian/control b/debian/control
index e6499aa..7641847 100644
--- a/debian/control
+++ b/debian/control
@@ -8,7 +8,7 @@ Homepage: http://www.reichwein.it/whiteboard/
 
 Package: whiteboard
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libxml2-utils
+Depends: ${shlibs:Depends}, ${misc:Depends}, libxml2-utils, pandoc
 Recommends: webserver
 Homepage: http://www.reichwein.it/whiteboard/
 Description: Web application for an collaborative editor
diff --git a/html/index.html b/html/index.html
index decc540..b72e23b 100644
--- a/html/index.html
+++ b/html/index.html
@@ -23,6 +23,7 @@
 			<button class="button" onclick="on_qrcode_click();">QR code</button>
 			<span id="status">Starting up...</span>
 			<button class="buttonred" id="reconnect" onclick="on_reconnect_click();" hidden>Reconnect</button>
+			<span class="helper"></span><img class="center-img clickable" onclick="on_pdf_click();" src="pdf-icon-30.png" height="37" width="30"/></span>
 			<br/>
 			<br/>
                         Reichwein.IT Whiteboard <span id="version"></span> by <a href="https://www.reichwein.it">https://www.reichwein.it</a><br/>
diff --git a/html/whiteboard.css b/html/whiteboard.css
index 4de9b46..2d222d5 100644
--- a/html/whiteboard.css
+++ b/html/whiteboard.css
@@ -20,6 +20,20 @@ div.status {
 	color: #FF0000;
 }
 
+span.helper {
+	display: inline-block;
+	height: 100%;
+	vertical-align: middle;
+}
+
+img.center-img {
+	vertical-align: middle;
+}
+
+.clickable {
+	cursor: pointer;
+}
+
 textarea {
 	/*
 	height: 30vh;
diff --git a/html/whiteboard.js b/html/whiteboard.js
index 38f972f..379c757 100644
--- a/html/whiteboard.js
+++ b/html/whiteboard.js
@@ -94,6 +94,14 @@ function on_version(version)
 	document.getElementById("version").textContent = version;
 }
 
+function on_pdf(pdf)
+{
+        var a = document.getElementById("download-a");
+        a.href = "data:application/pdf;base64," + pdf;
+        a.download = get_id() + ".pdf"
+        a.click();
+}
+
 function on_modify_ack(rev)
 {
         if (rev != revision + 1)
@@ -128,6 +136,8 @@ function on_message(e) {
 		on_qrcode(xmlDocument.getElementsByTagName("png")[0].textContent);
 	} else if (type == "version") {
 		on_version(xmlDocument.getElementsByTagName("version")[0].textContent);
+	} else if (type == "pdf") {
+		on_pdf(xmlDocument.getElementsByTagName("pdf")[0].textContent);
 	} else if (type == "error") {
 		alert(xmlDocument.getElementsByTagName("message")[0].textContent);
 	} else {
@@ -334,3 +344,8 @@ function on_qrcode_click()
 	websocket.send(new XMLSerializer().serializeToString(xmlDocument));
 }
 
+function on_pdf_click()
+{
+	websocket.send("<request><command>pdf</command><id>" + get_id() + "</id></request>");
+}
+
diff --git a/whiteboard.cpp b/whiteboard.cpp
index 88f4f3b..220d85e 100644
--- a/whiteboard.cpp
+++ b/whiteboard.cpp
@@ -34,11 +34,13 @@
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/signal_set.hpp>
 #include <boost/asio/strand.hpp>
+#include <boost/process.hpp>
 
 #include <fmt/core.h>
 
 #include "libreichwein/base64.h"
 #include "libreichwein/file.h"
+#include "libreichwein/tempfile.h"
 #include "libreichwein/xml.h"
 
 #include "config.h"
@@ -50,6 +52,7 @@ namespace pt = boost::property_tree;
 using namespace std::string_literals;
 using namespace std::placeholders;
 namespace fs = std::filesystem;
+namespace bp = boost::process;
 
 namespace {
 
@@ -389,6 +392,16 @@ public:
    } else if (command == "getstats") {
     setup_stats_timer();
     return stats_xml();
+   } else if (command == "pdf") {
+    std::string id {xml.get<std::string>("request.id")};
+    Reichwein::Tempfile mdFilePath{".md"};
+    Reichwein::File::setFile(mdFilePath.getPath(), m_storage.getDocument(id));
+    Reichwein::Tempfile pdfFilePath{".pdf"};
+    int system_result{bp::system("/usr/bin/pandoc", mdFilePath.getPath().generic_string(), "-o", pdfFilePath.getPath().generic_string())};
+    if (system_result)
+     throw std::runtime_error("pandoc returned: "s + std::to_string(system_result));
+    std::string pdfdata{Reichwein::File::getFile(pdfFilePath.getPath())};
+    return make_xml({{"type", "pdf"}, {"pdf", Reichwein::Base64::encode64(pdfdata)}});
    } else {
     throw std::runtime_error("Bad command: "s + command);
    }
-- 
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