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/*
* Copyright 2008-2019 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "UriExtract.hxx"
#include "CharUtil.hxx"
#include "StringView.hxx"
#include <string.h>
static constexpr bool
IsValidSchemeStart(char ch)
{
return IsLowerAlphaASCII(ch);
}
static constexpr bool
IsValidSchemeChar(char ch)
{
return IsLowerAlphaASCII(ch) || IsDigitASCII(ch) ||
ch == '+' || ch == '.' || ch == '-';
}
gcc_pure
static bool
IsValidScheme(std::string_view p) noexcept
{
if (p.empty() || !IsValidSchemeStart(p.front()))
return false;
for (size_t i = 1; i < p.size(); ++i)
if (!IsValidSchemeChar(p[i]))
return false;
return true;
}
/**
* Return the URI part after the scheme specification (and after the
* double slash).
*/
gcc_pure
static std::string_view
uri_after_scheme(std::string_view uri) noexcept
{
if (uri.length() > 2 &&
uri[0] == '/' && uri[1] == '/' && uri[2] != '/')
return uri.substr(2);
auto colon = uri.find(':');
if (colon == std::string_view::npos ||
!IsValidScheme(uri.substr(0, colon)))
return {};
uri = uri.substr(colon + 1);
if (uri[0] != '/' || uri[1] != '/')
return {};
return uri.substr(2);
}
bool
uri_has_scheme(std::string_view uri) noexcept
{
return !uri_get_scheme(uri).empty();
}
std::string_view
uri_get_scheme(std::string_view uri) noexcept
{
auto end = uri.find("://");
if (end == std::string_view::npos)
return {};
return uri.substr(0, end);
}
bool
uri_is_relative_path(const char *uri) noexcept
{
return !uri_has_scheme(uri) && *uri != '/';
}
std::string_view
uri_get_path(std::string_view uri) noexcept
{
auto ap = uri_after_scheme(uri);
if (ap.data() != nullptr) {
auto slash = ap.find('/');
if (slash == std::string_view::npos)
return {};
return ap.substr(slash);
}
return uri;
}
/* suffixes should be ascii only characters */
const char *
uri_get_suffix(const char *uri) noexcept
{
const char *suffix = std::strrchr(uri, '.');
if (suffix == nullptr || suffix == uri ||
suffix[-1] == '/' || suffix[-1] == '\\')
return nullptr;
++suffix;
if (strpbrk(suffix, "/\\") != nullptr)
return nullptr;
return suffix;
}
const char *
uri_get_suffix(const char *uri, UriSuffixBuffer &buffer) noexcept
{
const char *suffix = uri_get_suffix(uri);
if (suffix == nullptr)
return nullptr;
const char *q = std::strchr(suffix, '?');
if (q != nullptr && size_t(q - suffix) < sizeof(buffer.data)) {
memcpy(buffer.data, suffix, q - suffix);
buffer.data[q - suffix] = 0;
suffix = buffer.data;
}
return suffix;
}
const char *
uri_get_fragment(const char *uri) noexcept
{
const char *fragment = std::strchr(uri, '#');
if (fragment == nullptr)
return nullptr;
return fragment + 1;
}
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