From fc2f037e216e517ec4b87b0663277a3fc40c1d74 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Fri, 18 Sep 2020 16:23:04 +0200
Subject: fix stuff, start encoding, add doku for attachment sending

---
 src/SimpleHandlers.cpp | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'src/SimpleHandlers.cpp')

diff --git a/src/SimpleHandlers.cpp b/src/SimpleHandlers.cpp
index 0a4bdb1..d9c6448 100644
--- a/src/SimpleHandlers.cpp
+++ b/src/SimpleHandlers.cpp
@@ -2,11 +2,14 @@
 
 #include "Response.hpp"
 
+#include <array>
 #include <cctype>
+#include <memory>
 #include <string>
-#include <fstream>
 #include <iomanip>
 #include <sstream>
+#include <iostream>
+#include <stdexcept>
 
 using namespace Response;
 
@@ -113,7 +116,30 @@ std::string url_encode(std::string const &value) {
     return escaped.str();
 }
 
+
+std::string exec(const char* cmd) {
+    std::array<char, 128> buffer{};
+    std::string result;
+    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
+    if (!pipe) {
+        throw std::runtime_error("popen() failed!");
+    }
+    while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
+        result += buffer.data();
+    }
+    return result;
+}
+
 json Handler::latexRenderHandler(std::string const &arguments, std::string const &session, void *payload) {
     (void) payload;
-    return simple_response("https://latex.codecogs.com/png.latex?" + url_encode(arguments), session, true);
+
+    std::string file = exec("mktemp");
+
+    std::string result = exec(("curl -s 'https://latex.codecogs.com/png.latex?" + url_encode(arguments) + "' "
+            "-H 'User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0' "
+            "-H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' "
+            "-H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'DNT: 1' -H 'Connection: keep-alive' "
+            "-H 'Upgrade-Insecure-Requests: 1' --output " + file).c_str());
+
+    return simple_response(result, session, true);
 }
-- 
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