Added the cUrlParser class, exported to Lua API.

src/HTTPServer/UrlParser.cpp

@@ -0,0 +1,200 @@
+
+// UrlParser.cpp
+
+// Implements the cUrlParser class that parses string URL into individual parts
+
+#include "Globals.h"
+#include "UrlParser.h"
+
+
+
+
+
+UInt16 cUrlParser::GetDefaultPort(const AString & a_Scheme)
+{
+	if (a_Scheme == "http")
+	{
+		return 80;
+	}
+	else if (a_Scheme == "https")
+	{
+		return 443;
+	}
+	else if (a_Scheme == "ftp")
+	{
+		return 21;
+	}
+	else if (a_Scheme == "mailto")
+	{
+		return 25;
+	}
+	return 0;
+}
+
+
+
+
+
+std::pair<bool, AString> cUrlParser::ParseAuthorityPart(
+	const AString & a_AuthorityPart,
+	AString & a_Username,
+	AString & a_Password,
+	AString & a_Host,
+	UInt16 & a_Port
+)
+{
+	/*
+	a_AuthorityPart format:
+	[user:password@]host[:port]
+	host can be an IPv4, hostname, or an IPv6 enclosed in brackets
+	Assume only the password can contain an additional at-sign
+	*/
+
+	// Split the authority on the last at-sign, if present:
+	auto idxLastAtSign = a_AuthorityPart.find_last_of('@');
+	auto credPart = (idxLastAtSign == AString::npos) ? AString() : a_AuthorityPart.substr(0, idxLastAtSign);
+	auto srvrPart = (idxLastAtSign == AString::npos) ? a_AuthorityPart : a_AuthorityPart.substr(idxLastAtSign + 1);
+
+	// User credentials are completely optional:
+	auto idxCredColon = credPart.find(':');
+	a_Username = credPart.substr(0, idxCredColon);
+	a_Password = (idxCredColon == AString::npos) ? AString() : credPart.substr(idxCredColon + 1);
+
+	// Host can be a hostname, IPv4 or [IPv6]. If in brackets, search for the closing bracket first
+	if (srvrPart.empty())
+	{
+		// No host information at all. Bail out with success
+		a_Host.clear();
+		return std::make_pair(true, AString());
+	}
+	if (srvrPart[0] == '[')
+	{
+		// [IPv6] host, search for the closing bracket
+		auto idxClosingBracket = srvrPart.find(']');
+		if (idxClosingBracket == AString::npos)
+		{
+			return std::make_pair(false, "Invalid IPv6-like address, missing closing bracket");
+		}
+		a_Host = srvrPart.substr(0, idxClosingBracket);
+		auto portPart = srvrPart.substr(idxClosingBracket + 1);
+		if (portPart.empty())
+		{
+			// No port was specified, return success
+			return std::make_pair(true, AString());
+		}
+		if (portPart[0] != ':')
+		{
+			return std::make_pair(false, "Invalid port format after IPv6 address, mising colon");
+		}
+		if (!StringToInteger(portPart.substr(2), a_Port))
+		{
+			return std::make_pair(false, "Failed to parse port number after IPv6 address");
+		}
+		return std::make_pair(true, AString());
+	}
+
+	// Not an [IPv6] address, split on the last colon:
+	auto idxLastColon = srvrPart.find_last_of(':');
+	a_Host = srvrPart.substr(0, idxLastColon);
+	if (idxLastColon == AString::npos)
+	{
+		// No port was specified, return success
+		return std::make_pair(true, AString());
+	}
+	auto portPart = srvrPart.substr(idxLastColon + 1);
+	if (!StringToInteger(portPart, a_Port))
+	{
+		return std::make_pair(false, "Failed to parse port number after hostname");
+	}
+	return std::make_pair(true, AString());
+}
+
+
+
+
+
+std::pair<bool, AString> cUrlParser::Parse(
+	const AString & a_Url,
+	AString & a_Scheme,
+	AString & a_Username,
+	AString & a_Password,
+	AString & a_Host,
+	UInt16 & a_Port,
+	AString & a_Path,
+	AString & a_Query,
+	AString & a_Fragment
+)
+{
+	// Find the scheme - the text before the first colon:
+	auto idxColon = a_Url.find(':');
+	if (idxColon == AString::npos)
+	{
+		return std::make_pair(false, "Cannot parse the Scheme part of the URL");
+	}
+	a_Scheme = StrToLower(a_Url.substr(0, idxColon));
+	a_Port = GetDefaultPort(a_Scheme);
+	if (a_Port == 0)
+	{
+		return std::make_pair(false, Printf("Unknown URL scheme: \"%s\"", a_Scheme.c_str()));
+	}
+
+	// If the next two chars are a double-slash, skip them:
+	auto authStart = idxColon + 1;
+	if (a_Url.substr(authStart, 2) == "//")
+	{
+		authStart += 2;
+	}
+
+	// The Authority part follows the Scheme, until the first slash:
+	auto idxFirstSlash = a_Url.find('/', authStart + 1);
+	if (idxFirstSlash == AString::npos)
+	{
+		// No slash, the whole end of the Url is the authority part
+		idxFirstSlash = a_Url.size();
+	}
+
+	// Parse the Authority part into individual components:
+	auto res = ParseAuthorityPart(
+		a_Url.substr(authStart, idxFirstSlash - authStart),
+		a_Username, a_Password,
+		a_Host, a_Port
+	);
+	if (!res.first)
+	{
+		return res;
+	}
+
+	// Parse the rest into a path, query and fragment:
+	a_Path.clear();
+	a_Query.clear();
+	a_Fragment.clear();
+	if (idxFirstSlash == a_Url.size())
+	{
+		// No additional data, bail out with success
+		return std::make_pair(true, AString());
+	}
+	auto idxPathEnd = a_Url.find_first_of("?#", idxFirstSlash + 1);
+	if (idxPathEnd == AString::npos)
+	{
+		a_Path = a_Url.substr(idxFirstSlash);
+		return std::make_pair(true, AString());
+	}
+	a_Path = a_Url.substr(idxFirstSlash, idxPathEnd - idxFirstSlash);
+	auto idxHash = a_Url.find('#', idxPathEnd);
+	if (idxHash == AString::npos)
+	{
+		a_Query = a_Url.substr(idxPathEnd + 1);
+		return std::make_pair(true, AString());
+	}
+	if (idxHash > idxPathEnd)
+	{
+		a_Query = a_Url.substr(idxPathEnd + 1, idxHash - idxPathEnd - 1);
+	}
+	a_Fragment = a_Url.substr(idxHash + 1);
+	return std::make_pair(true, AString());
+}
+
+
+
+
+