/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2021-2024 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2007 Craig Edwards <brain@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
namespace Base64
{
/** The default table used when handling Base64-encoded strings. */
inline constexpr const char* TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/** Decodes a Base64-encoded byte array.
* @param data The byte array to decode from.
* @param length The length of the byte array.
* @param table The index table to use for decoding.
* @return The decoded form of the specified data.
*/
CoreExport std::string Decode(const void* data, size_t length, const char* table = nullptr);
/** Decodes a Base64-encoded string.
* @param data The string to decode from.
* @param table The index table to use for decoding.
* @return The decoded form of the specified data.
*/
inline std::string Decode(const std::string_view& data, const char* table = nullptr)
{
return Decode(data.data(), data.length(), table);
}
/** Encodes a byte array using Base64.
* @param data The byte array to encode from.
* @param length The length of the byte array.
* @param table The index table to use for encoding.
* @param padding If non-zero then the character to pad encoded strings with.
* @return The encoded form of the specified data.
*/
CoreExport std::string Encode(const void* data, size_t length, const char* table = nullptr, char padding = 0);
/** Encodes a string using Base64.
* @param data The string to encode from.
* @param table The index table to use for encoding.
* @param padding If non-zero then the character to pad encoded strings with.
* @return The encoded form of the specified data.
*/
inline std::string Encode(const std::string_view& data, const char* table = nullptr, char padding = 0)
{
return Encode(data.data(), data.length(), table, padding);
}
}
namespace Hex
{
/** The table used for encoding as a lower-case hexadecimal string. */
inline constexpr const char* TABLE_LOWER = "0123456789abcdef";
/** The table used for encoding as an upper-case hexadecimal string. */
inline constexpr const char* TABLE_UPPER = "0123456789ABCDEF";
/** Decodes a hexadecimal-encoded byte array.
* @param data The byte array to decode from.
* @param length The length of the byte array.
* @param separator If non-zero then the character hexadecimal digits are separated with.
* @param table The index table to use for decoding.
* @return The decoded form of the specified data.
*/
CoreExport std::string Decode(const void* data, size_t length, const char* table = nullptr, char separator = 0);
/** Decodes a hexadecimal-encoded string.
* @param data The string to decode from.
* @param table The index table to use for decoding.
* @param separator If non-zero then the character hexadecimal digits are separated with.
* @return The decoded form of the specified data.
*/
inline std::string Decode(const std::string_view& data, const char* table = nullptr, char separator = 0)
{
return Decode(data.data(), data.length(), table, separator);
}
/** Encodes a byte array using hexadecimal encoding.
* @param data The byte array to encode from.
* @param length The length of the byte array.
* @param table The index table to use for encoding.
* @param separator If non-zero then the character to separate hexadecimal digits with.
* @return The encoded form of the specified data.
*/
CoreExport std::string Encode(const void* data, size_t length, const char* table = nullptr, char separator = 0);
/** Encodes a string using Base64.
* @param data The string to encode from.
* @param table The index table to use for encoding.
* @param separator If non-zero then the character to separate hexadecimal digits with.
* @return The encoded form of the specified data.
*/
inline std::string Encode(const std::string_view& data, const char* table = nullptr, char separator = 0)
{
return Encode(data.data(), data.length(), table, separator);
}
}
namespace Percent
{
/** The table used to determine what characters are safe within a percent-encoded string. */
inline constexpr const char* TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.~";
/** Decodes a percent-encoded byte array.
* @param data The byte array to decode from.
* @param length The length of the byte array.
* @return The decoded form of the specified data.
*/
CoreExport std::string Decode(const void* data, size_t length);
/** Decodes a percent-encoded string.
* @param data The string to decode from.
* @return The decoded form of the specified data.
*/
inline std::string Decode(const std::string_view& data)
{
return Decode(data.data(), data.length());
}
/** Encodes a byte array using percent encoding.
* @param data The byte array to encode from.
* @param length The length of the byte array.
* @param table The table of characters that do not require escaping.
* @param upper Whether to use upper or lower case.
* @return The encoded form of the specified data.
*/
CoreExport std::string Encode(const void* data, size_t length, const char* table = nullptr, bool upper = true);
/** Encodes a string using percent encoding.
* @param data The string to encode from.
* @param table The table of characters that do not require escaping.
* @param upper Whether to use upper or lower case.
* @return The encoded form of the specified data.
*/
inline std::string Encode(const std::string_view& data, const char* table = nullptr, bool upper = true)
{
return Encode(data.data(), data.length(), table, upper);
}
}
namespace Template
{
/** A mapping of variable names to their values. */
using VariableMap = insp::flat_map<std::string, std::string>;
/** Replaces template variables like %foo% within a string.
* @param str The string to template from.
* @param vars The variables to replace within the string.
* @return The specified string with all variables replaced within it.
*/
CoreExport std::string Replace(const std::string_view& str, const VariableMap& vars);
}
/** Alows tokens in the IRC wire format to be read from a string. */
class CoreExport MessageTokenizer final
{
private:
/** The message to parse tokens from. */
std::string message;
/** The current position in the message. */
std::string::size_type position = 0;
public:
/** Creates a message tokenizer and fills it with the provided data.
* @param msg The messsage to parse tokens from.
* @param start The index to start tokenizing from.
* @param end The index to stop tokenizing at.
*/
MessageTokenizer(const std::string_view& msg, std::string::size_type start = 0, std::string::size_type end = std::string::npos);
/** Determines whether the tokenizer at at the end of the message. */
inline auto AtEnd() const { return this->position >= this->message.length(); }
/** Retrieves a reference to the whole message. */
auto& GetMessage() { return this->message; }
/** Retrieves the next \<middle> token in the message.
* @param token The next token available, or an empty string if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
bool GetMiddle(std::string& token);
/** Retrieves the next \<middle> token in the message.
* @param token The next token available, or an empty string view if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
bool GetMiddle(std::string_view& token);
/** Retrieves all remaining \<middle> tokens in the message.
* @param tokens A vector to place all remaining \<middle> tokens in.
*/
template<typename Value>
void GetRemainingMiddle(std::vector<Value>& tokens)
{
tokens.clear();
for (Value token; GetMiddle(token); )
tokens.push_back(token);
}
/** Retrieves all remaining \<trailing> tokens in the message.
* @param tokens A vector to place all remaining \<trailing> tokens in.
*/
template<typename Value>
void GetRemainingTrailing(std::vector<Value>& tokens)
{
tokens.clear();
for (Value token; GetTrailing(token); )
tokens.push_back(token);
}
/** Retrieves the current position in the message. */
auto GetPosition() const { return this->position; }
/** Retrieves the next \<trailing> token in the message.
* @param token The next token available, or an empty string if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
bool GetTrailing(std::string& token);
/** Retrieve the next \<trailing> token in the message.
* @param token The next token available, or an empty string view if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
bool GetTrailing(std::string_view& token);
};
class CoreExport StringSplitter final
{
private:
/** The current position in the string. */
std::string::size_type position = 0;
public:
/** Whether to allow empty values in the string. */
const bool allow_empty;
/** The value to split the string based on. */
const std::string::value_type separator;
/** The string to parse tokens from. */
const std::string string;
/** Creates a string splitter and fills it with the provided data.
* @param str The string to split.
* @param sep The value to split on.
* @param ae Whether to allow empty tokens within the string.
* @param start The index to start splitting from.
* @param end The index to stop splitting at.
*/
StringSplitter(const std::string_view& str, std::string::value_type sep = ' ', bool ae = false, std::string::size_type start = 0, std::string::size_type end = std::string::npos);
/** Determines whether the splitter at at the end of the message. */
inline auto AtEnd() const { return this->position >= this->string.length(); }
/** Retrieves the current position in the string. */
inline auto GetPosition() const { return this->position; }
/** Retrieves a view to the part of the string which has not been split yet. */
std::string_view GetRemaining() const;
/** Retrieves the next token in the string.
* @param token The next token available, or an empty string if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
bool GetToken(std::string& token);
/** Retrieves the next token in the string.
* @param token The next token available, or an empty string view if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
bool GetToken(std::string_view& token);
/** Retrieves the next numeric token in the string.
* @param token The next token available, or an default-initialised value if none remain.
* @return True if a token was retrieved; otherwise, false.
*/
template<typename Numeric>
bool GetToken(Numeric& token)
{
if (std::string_view sv; GetToken(sv))
{
token = ConvToNum<Numeric>(sv);
return true;
}
token = Numeric();
return true;
}
};
class CoreExport NumberRange final
{
private:
/** If we are in a num1-num2 range then the start and end of the current span. */
std::pair<uintmax_t, uintmax_t> current_span;
/** If we are skipping duplicates then numbers that have already been seen. */
std::set<uintmax_t> seen;
/** The splitter for separating comma-delimited ports. */
StringSplitter splitter;
/** Retrieves a single number from the range between \p sv1 and \p sv2.
* @param sv1 A string view containing the start of the range.
* @param sv2 A string view containing the end of the range.
* @param num The next number available, or an default-initialised value if none remain.
* @param min The minimum valid value to return.
* @param max The maximum valid value to return.
* @return True if a number was retrieved; otherwise, false.
*/
bool GetRange(const std::string_view& sv1, const std::string_view& sv2, uintmax_t& num, uintmax_t min, uintmax_t max);
/** Retrieves a single number from \p sv.
* @param sv A string view containing a single number.
* @param num The next number available, or an default-initialised value if none remain.
* @param min The minimum valid value to return.
* @param max The maximum valid value to return.
* @return True if a number was retrieved; otherwise, false.
*/
bool GetSingle(const std::string_view& sv, uintmax_t& num, uintmax_t min, uintmax_t max);
/** Retrieves a number from the range stored in \ref current_span.
* @param num The next number available, or an default-initialised value if none remain.
* @param min The minimum valid value to return.
* @param max The maximum valid value to return.
* @return True if a number was retrieved; otherwise, false.
*/
bool GetSpan(uintmax_t& num, uintmax_t min, uintmax_t max);
/** Retrieves the next number in the range.
* @param num The next number available, or an default-initialised value if none remain.
* @param min The minimum valid value to return.
* @param max The maximum valid value to return.
* @return True if a number was retrieved; otherwise, false.
*/
bool GetToken(uintmax_t& num, uintmax_t min = std::numeric_limits<uintmax_t>::min(), uintmax_t max = std::numeric_limits<uintmax_t>::max());
/** Parses an integer. */
static bool Parse(const std::string_view& in, uintmax_t& out);
/** Determines if the specified number has been seen already and marks it as seen if not. */
bool Seen(uintmax_t num);
public:
/** Whether to skip duplicates in the range. */
const bool skip_duplicates;
/** Creates a number range and fills it with the provided data.
* @param range A number range in the format 1,2,3-4,5.
* @param sd Whether to skip duplicates in the range.
* @param start The index to start tokenizing from.
* @param end The index to stop tokenizing at.
*/
NumberRange(const std::string_view& range, bool sd = true, std::string::size_type start = 0, std::string::size_type end = std::string::npos);
/** @copydoc NumberRange::GetToken */
template<typename Numeric>
bool GetToken(Numeric& num, Numeric min = std::numeric_limits<Numeric>::min(), Numeric max = std::numeric_limits<Numeric>::max())
{
if (uintmax_t n; GetToken(n, static_cast<uintmax_t>(min), static_cast<uintmax_t>(max)))
{
num = static_cast<Numeric>(n);
return true;
}
num = Numeric();
return false;
}
};
