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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Optional.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/StringUtils.h>
#include <AK/URLParser.h>
namespace AK {
static bool is_ascii_hex_digit(u8 ch)
{
return (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F');
}
String urldecode(const StringView& input)
{
size_t cursor = 0;
auto peek = [&](size_t offset = 0) -> u8 {
if (cursor + offset >= input.length())
return 0;
return input[cursor + offset];
};
auto consume = [&] {
return input[cursor++];
};
StringBuilder builder;
while (cursor < input.length()) {
if (peek() != '%') {
builder.append(consume());
continue;
}
if (!is_ascii_hex_digit(peek(1)) || !is_ascii_hex_digit(peek(2))) {
builder.append(consume());
continue;
}
auto byte_point = StringUtils::convert_to_uint_from_hex(input.substring_view(cursor + 1, 2));
builder.append(byte_point.value());
consume();
consume();
consume();
}
return builder.to_string();
}
static inline bool in_c0_control_set(u32 c)
{
return c <= 0x1f || c > '~';
}
static inline bool in_fragment_set(u32 c)
{
return in_c0_control_set(c) || c == ' ' || c == '"' || c == '<' || c == '>' || c == '`';
}
static inline bool in_path_set(u32 c)
{
return in_fragment_set(c) || c == '#' || c == '?' || c == '{' || c == '}';
}
static inline bool in_userinfo_set(u32 c)
{
return in_path_set(c) || c == '/' || c == ':' || c == ';' || c == '=' || c == '@' || (c >= '[' && c <= '^') || c == '|';
}
String urlencode(const StringView& input, const StringView& exclude)
{
StringBuilder builder;
for (unsigned char ch : input) {
if (in_userinfo_set((u8)ch) && !exclude.contains(ch)) {
builder.append('%');
builder.appendff("{:02X}", ch);
} else {
builder.append(ch);
}
}
return builder.to_string();
}
}
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