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// 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, fmt::format(FMT_STRING("Unknown URL scheme: \"{}\""), a_Scheme));
}
// 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());
}
std::pair<bool, AString> cUrlParser::Validate(const AString & a_Url)
{
AString UrlScheme, UrlUsername, UrlPassword, UrlHost, UrlPath, UrlQuery, UrlFragment;
UInt16 Port;
return Parse(a_Url, UrlScheme, UrlUsername, UrlPassword, UrlHost, Port, UrlPath, UrlQuery, UrlFragment);
}
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