mirror of
https://github.com/CrowCpp/Crow.git
synced 2024-06-07 21:10:44 +00:00
618 lines
22 KiB
C++
618 lines
22 KiB
C++
#pragma once
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#include <cstdint>
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#include <stdexcept>
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#include <tuple>
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#include <type_traits>
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#include <cstring>
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#include <functional>
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#include <string>
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#include <unordered_map>
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#include "crow/settings.h"
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namespace crow
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{
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namespace black_magic
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{
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#ifndef CROW_MSVC_WORKAROUND
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struct OutOfRange
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{
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OutOfRange(unsigned /*pos*/, unsigned /*length*/) {}
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};
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constexpr unsigned requires_in_range(unsigned i, unsigned len)
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{
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return i >= len ? throw OutOfRange(i, len) : i;
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}
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/// A constant string implementation.
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class const_str
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{
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const char* const begin_;
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unsigned size_;
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public:
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template<unsigned N>
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constexpr const_str(const char (&arr)[N]):
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begin_(arr), size_(N - 1)
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{
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static_assert(N >= 1, "not a string literal");
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}
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constexpr char operator[](unsigned i) const
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{
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return requires_in_range(i, size_), begin_[i];
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}
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constexpr operator const char*() const
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{
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return begin_;
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}
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constexpr const char* begin() const { return begin_; }
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constexpr const char* end() const { return begin_ + size_; }
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constexpr unsigned size() const
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{
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return size_;
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}
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};
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constexpr unsigned find_closing_tag(const_str s, unsigned p)
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{
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return s[p] == '>' ? p : find_closing_tag(s, p + 1);
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}
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constexpr bool is_valid(const_str s, unsigned i = 0, int f = 0)
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{
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return i == s.size() ? f == 0 :
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f < 0 || f >= 2 ? false :
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s[i] == '<' ? is_valid(s, i + 1, f + 1) :
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s[i] == '>' ? is_valid(s, i + 1, f - 1) :
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is_valid(s, i + 1, f);
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}
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constexpr bool is_equ_p(const char* a, const char* b, unsigned n)
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{
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return *a == 0 && *b == 0 && n == 0 ? true :
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(*a == 0 || *b == 0) ? false :
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n == 0 ? true :
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*a != *b ? false :
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is_equ_p(a + 1, b + 1, n - 1);
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}
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constexpr bool is_equ_n(const_str a, unsigned ai, const_str b, unsigned bi, unsigned n)
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{
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return ai + n > a.size() || bi + n > b.size() ? false :
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n == 0 ? true :
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a[ai] != b[bi] ? false :
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is_equ_n(a, ai + 1, b, bi + 1, n - 1);
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}
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constexpr bool is_int(const_str s, unsigned i)
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{
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return is_equ_n(s, i, "<int>", 0, 5);
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}
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constexpr bool is_uint(const_str s, unsigned i)
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{
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return is_equ_n(s, i, "<uint>", 0, 6);
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}
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constexpr bool is_float(const_str s, unsigned i)
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{
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return is_equ_n(s, i, "<float>", 0, 7) ||
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is_equ_n(s, i, "<double>", 0, 8);
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}
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constexpr bool is_str(const_str s, unsigned i)
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{
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return is_equ_n(s, i, "<str>", 0, 5) ||
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is_equ_n(s, i, "<string>", 0, 8);
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}
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constexpr bool is_path(const_str s, unsigned i)
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{
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return is_equ_n(s, i, "<path>", 0, 6);
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}
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#endif
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template<typename T>
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struct parameter_tag
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{
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static const int value = 0;
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};
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#define CROW_INTERNAL_PARAMETER_TAG(t, i) \
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template<> \
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struct parameter_tag<t> \
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{ \
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static const int value = i; \
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}
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CROW_INTERNAL_PARAMETER_TAG(int, 1);
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CROW_INTERNAL_PARAMETER_TAG(char, 1);
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CROW_INTERNAL_PARAMETER_TAG(short, 1);
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CROW_INTERNAL_PARAMETER_TAG(long, 1);
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CROW_INTERNAL_PARAMETER_TAG(long long, 1);
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CROW_INTERNAL_PARAMETER_TAG(unsigned int, 2);
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CROW_INTERNAL_PARAMETER_TAG(unsigned char, 2);
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CROW_INTERNAL_PARAMETER_TAG(unsigned short, 2);
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CROW_INTERNAL_PARAMETER_TAG(unsigned long, 2);
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CROW_INTERNAL_PARAMETER_TAG(unsigned long long, 2);
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CROW_INTERNAL_PARAMETER_TAG(double, 3);
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CROW_INTERNAL_PARAMETER_TAG(std::string, 4);
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#undef CROW_INTERNAL_PARAMETER_TAG
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template<typename... Args>
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struct compute_parameter_tag_from_args_list;
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template<>
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struct compute_parameter_tag_from_args_list<>
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{
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static const int value = 0;
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};
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template<typename Arg, typename... Args>
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struct compute_parameter_tag_from_args_list<Arg, Args...>
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{
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static const int sub_value =
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compute_parameter_tag_from_args_list<Args...>::value;
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static const int value =
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parameter_tag<typename std::decay<Arg>::type>::value ? sub_value * 6 + parameter_tag<typename std::decay<Arg>::type>::value : sub_value;
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};
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static inline bool is_parameter_tag_compatible(uint64_t a, uint64_t b)
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{
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if (a == 0)
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return b == 0;
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if (b == 0)
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return a == 0;
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int sa = a % 6;
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int sb = a % 6;
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if (sa == 5) sa = 4;
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if (sb == 5) sb = 4;
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if (sa != sb)
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return false;
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return is_parameter_tag_compatible(a / 6, b / 6);
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}
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static inline unsigned find_closing_tag_runtime(const char* s, unsigned p)
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{
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return s[p] == 0 ? throw std::runtime_error("unmatched tag <") :
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s[p] == '>' ? p :
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find_closing_tag_runtime(s, p + 1);
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}
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static inline uint64_t get_parameter_tag_runtime(const char* s, unsigned p = 0)
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{
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return s[p] == 0 ? 0 :
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s[p] == '<' ? (
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std::strncmp(s + p, "<int>", 5) == 0 ? get_parameter_tag_runtime(s, find_closing_tag_runtime(s, p)) * 6 + 1 :
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std::strncmp(s + p, "<uint>", 6) == 0 ? get_parameter_tag_runtime(s, find_closing_tag_runtime(s, p)) * 6 + 2 :
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(std::strncmp(s + p, "<float>", 7) == 0 ||
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std::strncmp(s + p, "<double>", 8) == 0) ?
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get_parameter_tag_runtime(s, find_closing_tag_runtime(s, p)) * 6 + 3 :
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(std::strncmp(s + p, "<str>", 5) == 0 ||
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std::strncmp(s + p, "<string>", 8) == 0) ?
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get_parameter_tag_runtime(s, find_closing_tag_runtime(s, p)) * 6 + 4 :
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std::strncmp(s + p, "<path>", 6) == 0 ? get_parameter_tag_runtime(s, find_closing_tag_runtime(s, p)) * 6 + 5 :
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throw std::runtime_error("invalid parameter type")) :
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get_parameter_tag_runtime(s, p + 1);
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}
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#ifndef CROW_MSVC_WORKAROUND
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constexpr uint64_t get_parameter_tag(const_str s, unsigned p = 0)
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{
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return p == s.size() ? 0 :
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s[p] == '<' ? (
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is_int(s, p) ? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 1 :
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is_uint(s, p) ? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 2 :
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is_float(s, p) ? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 3 :
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is_str(s, p) ? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 4 :
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is_path(s, p) ? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 5 :
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throw std::runtime_error("invalid parameter type")) :
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get_parameter_tag(s, p + 1);
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}
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#endif
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template<typename... T>
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struct S
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{
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template<typename U>
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using push = S<U, T...>;
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template<typename U>
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using push_back = S<T..., U>;
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template<template<typename... Args> class U>
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using rebind = U<T...>;
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};
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template<typename F, typename Set>
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struct CallHelper;
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template<typename F, typename... Args>
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struct CallHelper<F, S<Args...>>
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{
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template<typename F1, typename... Args1, typename = decltype(std::declval<F1>()(std::declval<Args1>()...))>
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static char __test(int);
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template<typename...>
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static int __test(...);
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static constexpr bool value = sizeof(__test<F, Args...>(0)) == sizeof(char);
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};
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template<int N>
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struct single_tag_to_type
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{};
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template<>
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struct single_tag_to_type<1>
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{
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using type = int64_t;
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};
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template<>
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struct single_tag_to_type<2>
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{
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using type = uint64_t;
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};
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template<>
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struct single_tag_to_type<3>
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{
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using type = double;
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};
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template<>
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struct single_tag_to_type<4>
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{
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using type = std::string;
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};
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template<>
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struct single_tag_to_type<5>
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{
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using type = std::string;
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};
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template<uint64_t Tag>
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struct arguments
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{
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using subarguments = typename arguments<Tag / 6>::type;
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using type =
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typename subarguments::template push<typename single_tag_to_type<Tag % 6>::type>;
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};
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template<>
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struct arguments<0>
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{
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using type = S<>;
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};
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template<typename... T>
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struct last_element_type
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{
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using type = typename std::tuple_element<sizeof...(T) - 1, std::tuple<T...>>::type;
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};
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template<>
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struct last_element_type<>
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{};
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// from http://stackoverflow.com/questions/13072359/c11-compile-time-array-with-logarithmic-evaluation-depth
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template<class T>
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using Invoke = typename T::type;
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template<unsigned...>
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struct seq
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{
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using type = seq;
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};
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template<class S1, class S2>
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struct concat;
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template<unsigned... I1, unsigned... I2>
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struct concat<seq<I1...>, seq<I2...>> : seq<I1..., (sizeof...(I1) + I2)...>
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{};
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template<class S1, class S2>
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using Concat = Invoke<concat<S1, S2>>;
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template<unsigned N>
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struct gen_seq;
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template<unsigned N>
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using GenSeq = Invoke<gen_seq<N>>;
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template<unsigned N>
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struct gen_seq : Concat<GenSeq<N / 2>, GenSeq<N - N / 2>>
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{};
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template<>
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struct gen_seq<0> : seq<>
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{};
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template<>
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struct gen_seq<1> : seq<0>
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{};
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template<typename Seq, typename Tuple>
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struct pop_back_helper;
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template<unsigned... N, typename Tuple>
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struct pop_back_helper<seq<N...>, Tuple>
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{
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template<template<typename... Args> class U>
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using rebind = U<typename std::tuple_element<N, Tuple>::type...>;
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};
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template<typename... T>
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struct pop_back //: public pop_back_helper<typename gen_seq<sizeof...(T)-1>::type, std::tuple<T...>>
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{
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template<template<typename... Args> class U>
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using rebind = typename pop_back_helper<typename gen_seq<sizeof...(T) - 1>::type, std::tuple<T...>>::template rebind<U>;
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};
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template<>
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struct pop_back<>
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{
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template<template<typename... Args> class U>
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using rebind = U<>;
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};
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// from http://stackoverflow.com/questions/2118541/check-if-c0x-parameter-pack-contains-a-type
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template<typename Tp, typename... List>
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struct contains : std::true_type
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{};
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template<typename Tp, typename Head, typename... Rest>
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struct contains<Tp, Head, Rest...> : std::conditional<std::is_same<Tp, Head>::value, std::true_type, contains<Tp, Rest...>>::type
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{};
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template<typename Tp>
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struct contains<Tp> : std::false_type
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{};
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template<typename T>
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struct empty_context
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{};
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template<typename T>
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struct promote
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{
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using type = T;
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};
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#define CROW_INTERNAL_PROMOTE_TYPE(t1, t2) \
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template<> \
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struct promote<t1> \
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{ \
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using type = t2; \
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}
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CROW_INTERNAL_PROMOTE_TYPE(char, int64_t);
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CROW_INTERNAL_PROMOTE_TYPE(short, int64_t);
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CROW_INTERNAL_PROMOTE_TYPE(int, int64_t);
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CROW_INTERNAL_PROMOTE_TYPE(long, int64_t);
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CROW_INTERNAL_PROMOTE_TYPE(long long, int64_t);
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CROW_INTERNAL_PROMOTE_TYPE(unsigned char, uint64_t);
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CROW_INTERNAL_PROMOTE_TYPE(unsigned short, uint64_t);
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CROW_INTERNAL_PROMOTE_TYPE(unsigned int, uint64_t);
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CROW_INTERNAL_PROMOTE_TYPE(unsigned long, uint64_t);
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CROW_INTERNAL_PROMOTE_TYPE(unsigned long long, uint64_t);
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CROW_INTERNAL_PROMOTE_TYPE(float, double);
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#undef CROW_INTERNAL_PROMOTE_TYPE
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template<typename T>
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using promote_t = typename promote<T>::type;
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} // namespace black_magic
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namespace detail
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{
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template<class T, std::size_t N, class... Args>
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struct get_index_of_element_from_tuple_by_type_impl
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{
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static constexpr auto value = N;
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};
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template<class T, std::size_t N, class... Args>
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struct get_index_of_element_from_tuple_by_type_impl<T, N, T, Args...>
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{
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static constexpr auto value = N;
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};
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template<class T, std::size_t N, class U, class... Args>
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struct get_index_of_element_from_tuple_by_type_impl<T, N, U, Args...>
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{
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static constexpr auto value = get_index_of_element_from_tuple_by_type_impl<T, N + 1, Args...>::value;
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};
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} // namespace detail
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namespace utility
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{
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template<class T, class... Args>
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T& get_element_by_type(std::tuple<Args...>& t)
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{
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return std::get<detail::get_index_of_element_from_tuple_by_type_impl<T, 0, Args...>::value>(t);
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}
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template<typename T>
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struct function_traits;
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#ifndef CROW_MSVC_WORKAROUND
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template<typename T>
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struct function_traits : public function_traits<decltype(&T::operator())>
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{
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using parent_t = function_traits<decltype(&T::operator())>;
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static const size_t arity = parent_t::arity;
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using result_type = typename parent_t::result_type;
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template<size_t i>
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using arg = typename parent_t::template arg<i>;
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};
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#endif
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template<typename ClassType, typename R, typename... Args>
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struct function_traits<R (ClassType::*)(Args...) const>
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{
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static const size_t arity = sizeof...(Args);
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typedef R result_type;
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template<size_t i>
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using arg = typename std::tuple_element<i, std::tuple<Args...>>::type;
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};
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template<typename ClassType, typename R, typename... Args>
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struct function_traits<R (ClassType::*)(Args...)>
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{
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static const size_t arity = sizeof...(Args);
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typedef R result_type;
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template<size_t i>
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using arg = typename std::tuple_element<i, std::tuple<Args...>>::type;
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};
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template<typename R, typename... Args>
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struct function_traits<std::function<R(Args...)>>
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{
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static const size_t arity = sizeof...(Args);
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typedef R result_type;
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template<size_t i>
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using arg = typename std::tuple_element<i, std::tuple<Args...>>::type;
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};
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inline static std::string base64encode(const unsigned char* data, size_t size, const char* key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
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{
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std::string ret;
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ret.resize((size + 2) / 3 * 4);
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auto it = ret.begin();
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while (size >= 3)
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{
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*it++ = key[(static_cast<unsigned char>(*data) & 0xFC) >> 2];
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unsigned char h = (static_cast<unsigned char>(*data++) & 0x03) << 4;
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*it++ = key[h | ((static_cast<unsigned char>(*data) & 0xF0) >> 4)];
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h = (static_cast<unsigned char>(*data++) & 0x0F) << 2;
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*it++ = key[h | ((static_cast<unsigned char>(*data) & 0xC0) >> 6)];
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*it++ = key[static_cast<unsigned char>(*data++) & 0x3F];
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size -= 3;
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}
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if (size == 1)
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{
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*it++ = key[(static_cast<unsigned char>(*data) & 0xFC) >> 2];
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unsigned char h = (static_cast<unsigned char>(*data++) & 0x03) << 4;
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*it++ = key[h];
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*it++ = '=';
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*it++ = '=';
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}
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else if (size == 2)
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{
|
|
*it++ = key[(static_cast<unsigned char>(*data) & 0xFC) >> 2];
|
|
unsigned char h = (static_cast<unsigned char>(*data++) & 0x03) << 4;
|
|
*it++ = key[h | ((static_cast<unsigned char>(*data) & 0xF0) >> 4)];
|
|
h = (static_cast<unsigned char>(*data++) & 0x0F) << 2;
|
|
*it++ = key[h];
|
|
*it++ = '=';
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
inline static std::string base64encode(std::string data, size_t size, const char* key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
|
|
{
|
|
return base64encode((const unsigned char*)data.c_str(), size, key);
|
|
}
|
|
|
|
inline static std::string base64encode_urlsafe(const unsigned char* data, size_t size)
|
|
{
|
|
return base64encode(data, size, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_");
|
|
}
|
|
|
|
inline static std::string base64encode_urlsafe(std::string data, size_t size)
|
|
{
|
|
return base64encode((const unsigned char*)data.c_str(), size, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_");
|
|
}
|
|
|
|
inline static std::string base64decode(const char* data, size_t size, bool urlsafe = false)
|
|
{
|
|
// clang-format off
|
|
std::unordered_map<char, unsigned char> key ({
|
|
{'A', 0},{'B', 1},{'C', 2},{'D', 3},{'E', 4},{'F', 5},{'G', 6},{'H', 7},{'I', 8},{'J', 9},
|
|
{'K', 10},{'L', 11},{'M', 12},{'N', 13},{'O', 14},{'P', 15},{'Q', 16},{'R', 17},{'S', 18},{'T', 19},
|
|
{'U', 20},{'V', 21},{'W', 22},{'X', 23},{'Y', 24},{'Z', 25},{'a', 26},{'b', 27},{'c', 28},{'d', 29},
|
|
{'e', 30},{'f', 31},{'g', 32},{'h', 33},{'i', 34},{'j', 35},{'k', 36},{'l', 37},{'m', 38},{'n', 39},
|
|
{'o', 40},{'p', 41},{'q', 42},{'r', 43},{'s', 44},{'t', 45},{'u', 46},{'v', 47},{'w', 48},{'x', 49},
|
|
{'y', 50},{'z', 51},{'0', 52},{'1', 53},{'2', 54},{'3', 55},{'4', 56},{'5', 57},{'6', 58},{'7', 59},
|
|
{'8', 60},{'9', 61},{urlsafe ? '-' : '+', 62},{urlsafe ? '_' : '/', 63}});
|
|
|
|
// clang-format on
|
|
|
|
// Not padded
|
|
if (size % 4 == 2) // missing last 2 characters
|
|
size = (size / 4 * 3) + 1; // Not subtracting extra characters because they're truncated in int division
|
|
else if (size % 4 == 3) // missing last character
|
|
size = (size / 4 * 3) + 2; // Not subtracting extra characters because they're truncated in int division
|
|
|
|
// Padded
|
|
else if (data[size - 2] == '=') // padded with '=='
|
|
size = (size / 4 * 3) - 2; // == padding means the last block only has 1 character instead of 3, hence the '-2'
|
|
else if (data[size - 1] == '=') // padded with '='
|
|
size = (size / 4 * 3) - 1; // = padding means the last block only has 2 character instead of 3, hence the '-1'
|
|
|
|
// Padding not needed
|
|
else
|
|
size = size / 4 * 3;
|
|
|
|
std::string ret;
|
|
ret.resize(size);
|
|
auto it = ret.begin();
|
|
|
|
// These will be used to decode 1 character at a time
|
|
unsigned char odd; // char1 and char3
|
|
unsigned char even; // char2 and char4
|
|
|
|
// Take 4 character blocks to turn into 3
|
|
while (size >= 3)
|
|
{
|
|
// dec_char1 = (char1 shifted 2 bits to the left) OR ((char2 AND 00110000) shifted 4 bits to the right))
|
|
odd = key[*data++];
|
|
even = key[*data++];
|
|
*it++ = (odd << 2) | ((even & 0x30) >> 4);
|
|
// dec_char2 = ((char2 AND 00001111) shifted 4 bits left) OR ((char3 AND 00111100) shifted 2 bits right))
|
|
odd = key[*data++];
|
|
*it++ = ((even & 0x0F) << 4) | ((odd & 0x3C) >> 2);
|
|
// dec_char3 = ((char3 AND 00000011) shifted 6 bits left) OR (char4)
|
|
even = key[*data++];
|
|
*it++ = ((odd & 0x03) << 6) | (even);
|
|
|
|
size -= 3;
|
|
}
|
|
if (size == 2)
|
|
{
|
|
// d_char1 = (char1 shifted 2 bits to the left) OR ((char2 AND 00110000) shifted 4 bits to the right))
|
|
odd = key[*data++];
|
|
even = key[*data++];
|
|
*it++ = (odd << 2) | ((even & 0x30) >> 4);
|
|
// d_char2 = ((char2 AND 00001111) shifted 4 bits left) OR ((char3 AND 00111100) shifted 2 bits right))
|
|
odd = key[*data++];
|
|
*it++ = ((even & 0x0F) << 4) | ((odd & 0x3C) >> 2);
|
|
}
|
|
else if (size == 1)
|
|
{
|
|
// d_char1 = (char1 shifted 2 bits to the left) OR ((char2 AND 00110000) shifted 4 bits to the right))
|
|
odd = key[*data++];
|
|
even = key[*data++];
|
|
*it++ = (odd << 2) | ((even & 0x30) >> 4);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
inline static std::string base64decode(std::string data, size_t size, bool urlsafe = false)
|
|
{
|
|
return base64decode(data.c_str(), size, urlsafe);
|
|
}
|
|
|
|
} // namespace utility
|
|
} // namespace crow
|