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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "UriUtil.hxx"
#include "ASCII.hxx"
#include "CharUtil.hxx"
#include <assert.h>
#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(StringView 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 const char *
uri_after_scheme(const char *uri) noexcept
{
if (uri[0] == '/' && uri[1] == '/' && uri[2] != '/')
return uri + 2;
const char *colon = strchr(uri, ':');
return colon != nullptr &&
IsValidScheme({uri, colon}) &&
colon[1] == '/' && colon[2] == '/'
? colon + 3
: nullptr;
}
bool
uri_has_scheme(const char *uri) noexcept
{
return strstr(uri, "://") != nullptr;
}
std::string
uri_get_scheme(const char *uri) noexcept
{
const char *end = strstr(uri, "://");
if (end == nullptr)
end = uri;
return std::string(uri, end);
}
const char *
uri_get_path(const char *uri) noexcept
{
const char *ap = uri_after_scheme(uri);
if (ap != nullptr)
return strchr(ap, '/');
return uri;
}
/* suffixes should be ascii only characters */
const char *
uri_get_suffix(const char *uri) noexcept
{
const char *suffix = 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 = 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;
}
static const char *
verify_uri_segment(const char *p) noexcept
{
unsigned dots = 0;
while (*p == '.') {
++p;
++dots;
}
if (dots <= 2 && (*p == 0 || *p == '/'))
return nullptr;
const char *q = strchr(p + 1, '/');
return q != nullptr ? q : "";
}
bool
uri_safe_local(const char *uri) noexcept
{
while (true) {
uri = verify_uri_segment(uri);
if (uri == nullptr)
return false;
if (*uri == 0)
return true;
assert(*uri == '/');
++uri;
}
}
gcc_pure
static const char *
SkipUriScheme(const char *uri) noexcept
{
const char *const schemes[] = { "http://", "https://", "ftp://" };
for (auto scheme : schemes) {
auto result = StringAfterPrefixCaseASCII(uri, scheme);
if (result != nullptr)
return result;
}
return nullptr;
}
std::string
uri_remove_auth(const char *uri) noexcept
{
const char *auth = SkipUriScheme(uri);
if (auth == nullptr)
/* unrecognized URI */
return std::string();
const char *slash = strchr(auth, '/');
if (slash == nullptr)
slash = auth + strlen(auth);
const char *at = (const char *)memchr(auth, '@', slash - auth);
if (at == nullptr)
/* no auth info present, do nothing */
return std::string();
/* duplicate the full URI and then delete the auth
information */
std::string result(uri);
result.erase(auth - uri, at + 1 - auth);
return result;
}
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 size_t parent_length = strlen(parent);
return memcmp(parent, child, parent_length) == 0 &&
child[parent_length] == '/';
}
bool
uri_is_child_or_same(const char *parent, const char *child) noexcept
{
return strcmp(parent, child) == 0 || 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;
}
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