Fix curl compatibility issues with colorize_url (#14615)

Also move the escape code safety check to guiOpenURL.

src/gui/guiOpenURL.cpp

@@ -42,6 +42,19 @@ GUIOpenURLMenu::GUIOpenURLMenu(gui::IGUIEnvironment* env,
 {
 }
 
+static std::string maybe_colorize_url(const std::string &url)
+{
+	// Forbid escape codes in URL
+	if (url.find('\x1b') != std::string::npos) {
+		throw std::runtime_error("URL contains escape codes");
+	}
+
+#ifdef HAVE_COLORIZE_URL
+	return colorize_url(url);
+#else
+	return url;
+#endif
+}
 
 void GUIOpenURLMenu::regenerateGui(v2u32 screensize)
 {
@@ -70,16 +83,12 @@ void GUIOpenURLMenu::regenerateGui(v2u32 screensize)
 	*/
 	bool ok = true;
 	std::string text;
-#ifdef USE_CURL
 	try {
-		text = colorize_url(url);
+		text = maybe_colorize_url(url);
 	} catch (const std::exception &e) {
 		text = std::string(e.what()) + " (url = " + url + ")";
 		ok = false;
 	}
-#else
-	text = url;
-#endif
 
 	/*
 		Add stuff

src/unittest/test_utilities.cpp

@@ -728,16 +728,18 @@ void TestUtilities::testIsBlockInSight()
 
 void TestUtilities::testColorizeURL()
 {
-#if USE_CURL
+#ifdef HAVE_COLORIZE_URL
 	#define RED COLOR_CODE("#faa")
 	#define GREY COLOR_CODE("#aaa")
 	#define WHITE COLOR_CODE("#fff")
 
 	std::string result = colorize_url("http://example.com/");
-	UASSERT(result == (GREY "http://" WHITE "example.com" GREY "/"));
+	UASSERTEQ(auto, result, (GREY "http://" WHITE "example.com" GREY "/"));
 
 	result = colorize_url(u8"https://u:p@wikipedi\u0430.org:1234/heIIoll?a=b#c");
-	UASSERT(result ==
+	UASSERTEQ(auto, result,
 		(GREY "https://u:p@" WHITE "wikipedi" RED "%d0%b0" WHITE ".org" GREY ":1234/heIIoll?a=b#c"));
+#else
+	warningstream << "Test skipped." << std::endl;
 #endif
 }

src/util/colorize.cpp

@@ -17,7 +17,7 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 #include "colorize.h"
 
-#if USE_CURL
+#ifdef HAVE_COLORIZE_URL
 
 #include <curl/urlapi.h>
 #include "log.h"
@@ -26,18 +26,13 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 std::string colorize_url(const std::string &url)
 {
-	// Forbid escape codes in URL
-	if (url.find('\x1b') != std::string::npos) {
-		throw std::runtime_error("Unable to open URL as it contains escape codes");
-	}
-
 	auto urlHandleRAII = std::unique_ptr<CURLU, decltype(&curl_url_cleanup)>(
 			curl_url(), curl_url_cleanup);
 	CURLU *urlHandle = urlHandleRAII.get();
 
 	auto rc = curl_url_set(urlHandle, CURLUPART_URL, url.c_str(), 0);
 	if (rc != CURLUE_OK) {
-		throw std::runtime_error("Unable to open URL as it is not valid");
+		throw std::runtime_error("URL is not valid");
 	}
 
 	auto url_get = [&] (CURLUPart what) -> std::string {
@@ -56,7 +51,11 @@ std::string colorize_url(const std::string &url)
 	auto path = url_get(CURLUPART_PATH);
 	auto query = url_get(CURLUPART_QUERY);
 	auto fragment = url_get(CURLUPART_FRAGMENT);
+#if LIBCURL_VERSION_NUM >= 0x074100
 	auto zoneid = url_get(CURLUPART_ZONEID);
+#else
+	std::string zoneid;
+#endif
 
 	std::ostringstream os;
 
@@ -75,9 +74,7 @@ std::string colorize_url(const std::string &url)
 	// Print hostname, escaping unsafe characters
 	os << white;
 	bool was_alphanum = true;
-	std::string host_s = host;
+	for (char c : host) {
-	for (size_t i = 0; i < host_s.size(); i++) {
-		char c = host_s[i];
 		bool is_alphanum = isalnum(c) || ispunct(c);
 		if (is_alphanum == was_alphanum) {
 			// skip

src/util/colorize.h

@@ -23,11 +23,19 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #define COLOR_CODE(color) "\x1b(c@" color ")"
 
 #if USE_CURL
+#include <curl/curlver.h>
+// curl_url functions since 7.62.0
+#if LIBCURL_VERSION_NUM >= 0x073e00
+#define HAVE_COLORIZE_URL
+#endif
+#endif
+
+#ifdef HAVE_COLORIZE_URL
 
 /**
- * Colorize URL to highlight the hostname and any unsafe characters
+ * Colorize URL to highlight the hostname and any unsafe characters.
  *
- * Throws an exception if the url is invalid
+ * Throws an exception if the url is invalid.
  */
 std::string colorize_url(const std::string &url);