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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 "UriRelative.hxx"
#include "UriExtract.hxx"
#include "StringAPI.hxx"
#include "StringCompare.hxx"
#include <cassert>
#include <string.h>
bool
uri_is_child(const char *parent, const char *child) noexcept
{
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(parent != nullptr);
assert(child != nullptr);
#endif
const char *suffix = StringAfterPrefix(child, parent);
return suffix != nullptr && *suffix != 0 &&
(suffix == child || suffix[-1] == '/' || *suffix == '/');
}
bool
uri_is_child_or_same(const char *parent, const char *child) noexcept
{
return StringIsEqual(parent, child) || uri_is_child(parent, child);
}
std::string
uri_apply_base(const std::string &uri, const std::string &base) noexcept
{
if (uri.front() == '/') {
/* absolute path: replace the whole URI path in base */
auto i = base.find("://");
if (i == base.npos)
/* no scheme: override base completely */
return uri;
/* find the first slash after the host part */
i = base.find('/', i + 3);
if (i == base.npos)
/* there's no URI path - simply append uri */
i = base.length();
return base.substr(0, i) + uri;
}
std::string out(base);
if (out.back() != '/')
out.push_back('/');
out += uri;
return out;
}
static void
ClearFilename(StringView &path) noexcept
{
const char *slash = path.FindLast('/');
if (slash != nullptr)
path.SetEnd(slash + 1);
else
path.size = 0;
}
static bool
ConsumeLastSegment(StringView &path) noexcept
{
assert(!path.empty());
assert(path.back() == '/');
path.pop_back();
const char *slash = path.FindLast('/');
if (slash == nullptr)
return false;
path.SetEnd(slash + 1);
return true;
}
static bool
ConsumeSpecial(const char *&relative_path, StringView &base_path) noexcept
{
while (true) {
if (const char *a = StringAfterPrefix(relative_path, "./")) {
while (*a == '/')
++a;
relative_path = a;
} else if (const char *b = StringAfterPrefix(relative_path, "../")) {
while (*b == '/')
++b;
relative_path = b;
if (!ConsumeLastSegment(base_path))
return false;
} else if (StringIsEqual(relative_path, ".")) {
++relative_path;
return true;
} else
return true;
}
}
std::string
uri_apply_relative(const std::string &relative_uri,
const std::string &base_uri) noexcept
{
if (relative_uri.empty())
return base_uri;
if (uri_has_scheme(relative_uri.c_str()))
return relative_uri;
const char *relative_path = relative_uri.c_str();
// TODO: support double slash at beginning of relative_uri
if (relative_uri.front() == '/') {
/* absolute path: replace the whole URI path in base */
auto i = base_uri.find("://");
if (i == base_uri.npos)
/* no scheme: override base completely */
return relative_uri;
/* find the first slash after the host part */
i = base_uri.find('/', i + 3);
if (i == base_uri.npos)
/* there's no URI path - simply append uri */
i = base_uri.length();
return base_uri.substr(0, i) + relative_uri;
}
const auto _base_path = uri_get_path(base_uri);
if (_base_path.data() == nullptr) {
std::string result(base_uri);
if (relative_uri.front() != '/')
result.push_back('/');
while (const char *a = StringAfterPrefix(relative_path, "./"))
relative_path = a;
if (StringStartsWith(relative_path, "../"))
return {};
if (!StringIsEqual(relative_path, "."))
result += relative_uri;
return result;
}
StringView base_path(_base_path);
ClearFilename(base_path);
if (!ConsumeSpecial(relative_path, base_path))
return {};
std::string result(base_uri.data(), _base_path.data());
result.append(base_path.data, base_path.size);
result.append(relative_path);
return result;
}