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uri.cpp
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uri.cpp
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/***
* Copyright (C) Microsoft. All rights reserved.
* Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
*
* =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
*
* Protocol independent support for URIs.
*
* For the latest on this and related APIs, please see: https://github.com/Microsoft/cpprestsdk
*
* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
****/
#include "stdafx.h"
#include <sstream>
using namespace utility::conversions;
namespace web
{
namespace details
{
namespace
{
/// <summary>
/// Unreserved characters are those that are allowed in a URI but do not have a reserved purpose. They include:
/// - A-Z
/// - a-z
/// - 0-9
/// - '-' (hyphen)
/// - '.' (period)
/// - '_' (underscore)
/// - '~' (tilde)
/// </summary>
inline bool is_unreserved(int c)
{
return ::utility::details::is_alnum((char)c) || c == '-' || c == '.' || c == '_' || c == '~';
}
/// <summary>
/// General delimiters serve as the delimiters between different uri components.
/// General delimiters include:
/// - All of these :/?#[]@
/// </summary>
inline bool is_gen_delim(int c)
{
return c == ':' || c == '/' || c == '?' || c == '#' || c == '[' || c == ']' || c == '@';
}
/// <summary>
/// Subdelimiters are those characters that may have a defined meaning within component
/// of a uri for a particular scheme. They do not serve as delimiters in any case between
/// uri segments. sub_delimiters include:
/// - All of these !$&'()*+,;=
/// </summary>
inline bool is_sub_delim(int c)
{
switch (c)
{
case '!':
case '$':
case '&':
case '\'':
case '(':
case ')':
case '*':
case '+':
case ',':
case ';':
case '=': return true;
default: return false;
}
}
/// <summary>
/// Reserved characters includes the general delimiters and sub delimiters. Some characters
/// are neither reserved nor unreserved, and must be percent-encoded.
/// </summary>
inline bool is_reserved(int c) { return is_gen_delim(c) || is_sub_delim(c); }
/// <summary>
/// Legal characters in the scheme portion include:
/// - Any alphanumeric character
/// - '+' (plus)
/// - '-' (hyphen)
/// - '.' (period)
///
/// Note that the scheme must BEGIN with an alpha character.
/// </summary>
inline bool is_scheme_character(int c)
{
return ::utility::details::is_alnum((char)c) || c == '+' || c == '-' || c == '.';
}
/// <summary>
/// Legal characters in the user information portion include:
/// - Any unreserved character
/// - The percent character ('%'), and thus any percent-endcoded octet
/// - The sub-delimiters
/// - ':' (colon)
/// </summary>
inline bool is_user_info_character(int c) { return is_unreserved(c) || is_sub_delim(c) || c == '%' || c == ':'; }
/// <summary>
/// Legal characters in the authority portion include:
/// - Any unreserved character
/// - The percent character ('%'), and thus any percent-endcoded octet
/// - The sub-delimiters
/// - ':' (colon)
/// - IPv6 requires '[]' allowed for it to be valid URI and passed to underlying platform for IPv6 support
/// </summary>
inline bool is_authority_character(int c)
{
return is_unreserved(c) || is_sub_delim(c) || c == '%' || c == '@' || c == ':' || c == '[' || c == ']';
}
/// <summary>
/// Legal characters in the path portion include:
/// - Any unreserved character
/// - The percent character ('%'), and thus any percent-endcoded octet
/// - The sub-delimiters
/// - ':' (colon)
/// - '@' (at sign)
/// </summary>
inline bool is_path_character(int c)
{
return is_unreserved(c) || is_sub_delim(c) || c == '%' || c == '/' || c == ':' || c == '@';
}
/// <summary>
/// Legal characters in the query portion include:
/// - Any path character
/// - '?' (question mark)
/// </summary>
inline bool is_query_character(int c) { return is_path_character(c) || c == '?'; }
/// <summary>
/// Legal characters in the fragment portion include:
/// - Any path character
/// - '?' (question mark)
/// </summary>
inline bool is_fragment_character(int c)
{
// this is intentional, they have the same set of legal characters
return is_query_character(c);
}
struct inner_parse_out
{
const utility::char_t* scheme_begin = nullptr;
const utility::char_t* scheme_end = nullptr;
const utility::char_t* uinfo_begin = nullptr;
const utility::char_t* uinfo_end = nullptr;
const utility::char_t* host_begin = nullptr;
const utility::char_t* host_end = nullptr;
int port = 0;
const utility::char_t* path_begin = nullptr;
const utility::char_t* path_end = nullptr;
const utility::char_t* query_begin = nullptr;
const utility::char_t* query_end = nullptr;
const utility::char_t* fragment_begin = nullptr;
const utility::char_t* fragment_end = nullptr;
/// <summary>
/// Parses the uri, setting the given pointers to locations inside the given buffer.
/// 'encoded' is expected to point to an encoded zero-terminated string containing a uri
/// </summary>
bool parse_from(const utility::char_t* encoded)
{
const utility::char_t* p = encoded;
// IMPORTANT -- A uri may either be an absolute uri, or an relative-reference
// Absolute: 'http://host.com'
// Relative-Reference: '//:host.com', '/path1/path2?query', './path1:path2'
// A Relative-Reference can be disambiguated by parsing for a ':' before the first slash
bool is_relative_reference = true;
const utility::char_t* p2 = p;
for (; *p2 != _XPLATSTR('/') && *p2 != _XPLATSTR('\0'); p2++)
{
if (*p2 == _XPLATSTR(':'))
{
// found a colon, the first portion is a scheme
is_relative_reference = false;
break;
}
}
if (!is_relative_reference)
{
// the first character of a scheme must be a letter
if (!isalpha(*p))
{
return false;
}
// start parsing the scheme, it's always delimited by a colon (must be present)
scheme_begin = p++;
for (; *p != ':'; p++)
{
if (!is_scheme_character(*p))
{
return false;
}
}
scheme_end = p;
// skip over the colon
p++;
}
// if we see two slashes next, then we're going to parse the authority portion
// later on we'll break up the authority into the port and host
const utility::char_t* authority_begin = nullptr;
const utility::char_t* authority_end = nullptr;
if (*p == _XPLATSTR('/') && p[1] == _XPLATSTR('/'))
{
// skip over the slashes
p += 2;
authority_begin = p;
// the authority is delimited by a slash (resource), question-mark (query) or octothorpe (fragment)
// or by EOS. The authority could be empty ('file:///C:\file_name.txt')
for (; *p != _XPLATSTR('/') && *p != _XPLATSTR('?') && *p != _XPLATSTR('#') && *p != _XPLATSTR('\0'); p++)
{
// We're NOT currently supporting IPvFuture or username/password in authority
// IPv6 as the host (i.e. http://[:::::::]) is allowed as valid URI and passed to subsystem for support.
if (!is_authority_character(*p))
{
return false;
}
}
authority_end = p;
// now lets see if we have a port specified -- by working back from the end
if (authority_begin != authority_end)
{
// the port is made up of all digits
const utility::char_t* port_begin = authority_end - 1;
for (; isdigit(*port_begin) && port_begin != authority_begin; port_begin--)
{
}
if (*port_begin == _XPLATSTR(':'))
{
// has a port
host_begin = authority_begin;
host_end = port_begin;
// skip the colon
port_begin++;
port =
utility::conversions::details::scan_string<int>(utility::string_t(port_begin, authority_end));
}
else
{
// no port
host_begin = authority_begin;
host_end = authority_end;
}
// look for a user_info component
const utility::char_t* u_end = host_begin;
for (; is_user_info_character(*u_end) && u_end != host_end; u_end++)
{
}
if (*u_end == _XPLATSTR('@'))
{
host_begin = u_end + 1;
uinfo_begin = authority_begin;
uinfo_end = u_end;
}
}
}
// if we see a path character or a slash, then the
// if we see a slash, or any other legal path character, parse the path next
if (*p == _XPLATSTR('/') || is_path_character(*p))
{
path_begin = p;
// the path is delimited by a question-mark (query) or octothorpe (fragment) or by EOS
for (; *p != _XPLATSTR('?') && *p != _XPLATSTR('#') && *p != _XPLATSTR('\0'); p++)
{
if (!is_path_character(*p))
{
return false;
}
}
path_end = p;
}
// if we see a ?, then the query is next
if (*p == _XPLATSTR('?'))
{
// skip over the question mark
p++;
query_begin = p;
// the query is delimited by a '#' (fragment) or EOS
for (; *p != _XPLATSTR('#') && *p != _XPLATSTR('\0'); p++)
{
if (!is_query_character(*p))
{
return false;
}
}
query_end = p;
}
// if we see a #, then the fragment is next
if (*p == _XPLATSTR('#'))
{
// skip over the hash mark
p++;
fragment_begin = p;
// the fragment is delimited by EOS
for (; *p != _XPLATSTR('\0'); p++)
{
if (!is_fragment_character(*p))
{
return false;
}
}
fragment_end = p;
}
return true;
}
void write_to(uri_components& components)
{
if (scheme_begin)
{
components.m_scheme.assign(scheme_begin, scheme_end);
utility::details::inplace_tolower(components.m_scheme);
}
else
{
components.m_scheme.clear();
}
if (uinfo_begin)
{
components.m_user_info.assign(uinfo_begin, uinfo_end);
}
if (host_begin)
{
components.m_host.assign(host_begin, host_end);
utility::details::inplace_tolower(components.m_host);
}
else
{
components.m_host.clear();
}
components.m_port = port;
if (path_begin)
{
components.m_path.assign(path_begin, path_end);
}
else
{
// default path to begin with a slash for easy comparison
components.m_path = _XPLATSTR("/");
}
if (query_begin)
{
components.m_query.assign(query_begin, query_end);
}
else
{
components.m_query.clear();
}
if (fragment_begin)
{
components.m_fragment.assign(fragment_begin, fragment_end);
}
else
{
components.m_fragment.clear();
}
}
};
// Encodes all characters not in given set determined by given function.
template<class F>
utility::string_t encode_impl(const utf8string& raw, F should_encode)
{
const utility::char_t* const hex = _XPLATSTR("0123456789ABCDEF");
utility::string_t encoded;
for (auto iter = raw.begin(); iter != raw.end(); ++iter)
{
// for utf8 encoded string, char ASCII can be greater than 127.
int ch = static_cast<unsigned char>(*iter);
// ch should be same under both utf8 and utf16.
if (should_encode(ch))
{
encoded.push_back(_XPLATSTR('%'));
encoded.push_back(hex[(ch >> 4) & 0xF]);
encoded.push_back(hex[ch & 0xF]);
}
else
{
// ASCII don't need to be encoded, which should be same on both utf8 and utf16.
encoded.push_back((utility::char_t)ch);
}
}
return encoded;
}
// 5.2.3. Merge Paths https://tools.ietf.org/html/rfc3986#section-5.2.3
utility::string_t mergePaths(const utility::string_t& base, const utility::string_t& relative)
{
const auto lastSlash = base.rfind(_XPLATSTR('/'));
if (lastSlash == utility::string_t::npos)
{
return base + _XPLATSTR('/') + relative;
}
else if (lastSlash == base.size() - 1)
{
return base + relative;
}
// path contains and does not end with '/', we remove segment after last '/'
return base.substr(0, lastSlash + 1) + relative;
}
// 5.2.4. Remove Dot Segments https://tools.ietf.org/html/rfc3986#section-5.2.4
void removeDotSegments(uri_builder& builder)
{
const ::utility::string_t dotSegment = _XPLATSTR(".");
const ::utility::string_t dotDotSegment = _XPLATSTR("..");
if (builder.path().find(_XPLATSTR('.')) == utility::string_t::npos) return;
const auto segments = uri::split_path(builder.path());
std::vector<std::reference_wrapper<const utility::string_t>> result;
for (auto& segment : segments)
{
if (segment == dotSegment)
continue;
else if (segment != dotDotSegment)
result.push_back(segment);
else if (!result.empty())
result.pop_back();
}
if (result.empty())
{
builder.set_path(utility::string_t());
return;
}
utility::string_t path = result.front().get();
for (size_t i = 1; i != result.size(); ++i)
{
path += _XPLATSTR('/');
path += result[i].get();
}
if (segments.back() == dotDotSegment || segments.back() == dotSegment || builder.path().back() == _XPLATSTR('/'))
{
path += _XPLATSTR('/');
}
builder.set_path(std::move(path));
}
} // namespace
utility::string_t uri_components::join()
{
// canonicalize components first
// convert scheme to lowercase
utility::details::inplace_tolower(m_scheme);
// convert host to lowercase
utility::details::inplace_tolower(m_host);
// canonicalize the path to have a leading slash if it's a full uri
if (!m_host.empty() && m_path.empty())
{
m_path = _XPLATSTR("/");
}
else if (!m_host.empty() && m_path[0] != _XPLATSTR('/'))
{
m_path.insert(m_path.begin(), 1, _XPLATSTR('/'));
}
utility::string_t ret;
if (!m_scheme.empty())
{
ret.append(m_scheme);
ret.push_back(_XPLATSTR(':'));
}
if (!m_host.empty())
{
ret.append(_XPLATSTR("//"));
if (!m_user_info.empty())
{
ret.append(m_user_info).append({_XPLATSTR('@')});
}
ret.append(m_host);
if (m_port > 0)
{
ret.append({_XPLATSTR(':')}).append(utility::conversions::details::to_string_t(m_port));
}
}
if (!m_path.empty())
{
// only add the leading slash when the host is present
if (!m_host.empty() && m_path.front() != _XPLATSTR('/'))
{
ret.push_back(_XPLATSTR('/'));
}
ret.append(m_path);
}
if (!m_query.empty())
{
ret.push_back(_XPLATSTR('?'));
ret.append(m_query);
}
if (!m_fragment.empty())
{
ret.push_back(_XPLATSTR('#'));
ret.append(m_fragment);
}
return ret;
}
} // namespace details
uri::uri(const details::uri_components& components) : m_components(components)
{
m_uri = m_components.join();
if (!uri::validate(m_uri.c_str()))
{
throw uri_exception("provided uri is invalid: " + utility::conversions::to_utf8string(m_uri));
}
}
uri::uri(const utility::string_t& uri_string) : uri(uri_string.c_str()) {}
uri::uri(const utility::char_t* uri_string)
{
details::inner_parse_out out;
if (!out.parse_from(uri_string))
{
throw uri_exception("provided uri is invalid: " + utility::conversions::to_utf8string(uri_string));
}
out.write_to(m_components);
m_uri = m_components.join();
}
utility::string_t uri::encode_query_impl(const utf8string& raw)
{
return details::encode_impl(raw, [](int ch) -> bool {
switch (ch)
{
// Encode '&', ';', and '=' since they are used
// as delimiters in query component.
case '&':
case ';':
case '=':
case '%':
case '+': return true;
default: return !details::is_query_character(ch);
}
});
}
/// </summary>
/// Encodes a string by converting all characters except for RFC 3986 unreserved characters to their
/// hexadecimal representation.
/// </summary>
utility::string_t uri::encode_data_string(const utility::string_t& data)
{
auto&& raw = utility::conversions::to_utf8string(data);
return details::encode_impl(raw, [](int ch) -> bool { return !details::is_unreserved(ch); });
}
utility::string_t uri::encode_uri(const utility::string_t& raw, uri::components::component component)
{
auto&& raw_utf8 = utility::conversions::to_utf8string(raw);
// Note: we also encode the '+' character because some non-standard implementations
// encode the space character as a '+' instead of %20. To better interoperate we encode
// '+' to avoid any confusion and be mistaken as a space.
switch (component)
{
case components::user_info:
return details::encode_impl(raw_utf8, [](int ch) -> bool {
return !details::is_user_info_character(ch) || ch == '%' || ch == '+';
});
case components::host:
return details::encode_impl(raw_utf8, [](int ch) -> bool {
// No encoding of ASCII characters in host name (RFC 3986 3.2.2)
return ch > 127;
});
case components::path:
return details::encode_impl(
raw_utf8, [](int ch) -> bool { return !details::is_path_character(ch) || ch == '%' || ch == '+'; });
case components::query:
return details::encode_impl(
raw_utf8, [](int ch) -> bool { return !details::is_query_character(ch) || ch == '%' || ch == '+'; });
case components::fragment:
return details::encode_impl(
raw_utf8, [](int ch) -> bool { return !details::is_fragment_character(ch) || ch == '%' || ch == '+'; });
case components::full_uri:
default:
return details::encode_impl(
raw_utf8, [](int ch) -> bool { return !details::is_unreserved(ch) && !details::is_reserved(ch); });
};
}
/// <summary>
/// Helper function to convert a hex character digit to a decimal character value.
/// Throws an exception if not a valid hex digit.
/// </summary>
static int hex_char_digit_to_decimal_char(int hex)
{
int decimal;
if (hex >= '0' && hex <= '9')
{
decimal = hex - '0';
}
else if (hex >= 'A' && hex <= 'F')
{
decimal = 10 + (hex - 'A');
}
else if (hex >= 'a' && hex <= 'f')
{
decimal = 10 + (hex - 'a');
}
else
{
throw uri_exception("Invalid hexadecimal digit");
}
return decimal;
}
template<class String>
static std::string decode_template(const String& encoded)
{
std::string raw;
for (auto iter = encoded.begin(); iter != encoded.end(); ++iter)
{
if (*iter == '%')
{
if (++iter == encoded.end())
{
throw uri_exception("Invalid URI string, two hexadecimal digits must follow '%'");
}
int decimal_value = hex_char_digit_to_decimal_char(static_cast<int>(*iter)) << 4;
if (++iter == encoded.end())
{
throw uri_exception("Invalid URI string, two hexadecimal digits must follow '%'");
}
decimal_value += hex_char_digit_to_decimal_char(static_cast<int>(*iter));
raw.push_back(static_cast<char>(decimal_value));
}
else if (*iter > 127 || *iter < 0)
{
throw uri_exception("Invalid encoded URI string, must be entirely ascii");
}
else
{
// encoded string has to be ASCII.
raw.push_back(static_cast<char>(*iter));
}
}
return raw;
}
utility::string_t uri::decode(const utility::string_t& encoded) { return to_string_t(decode_template(encoded)); }
std::vector<utility::string_t> uri::split_path(const utility::string_t& path)
{
std::vector<utility::string_t> results;
utility::istringstream_t iss(path);
iss.imbue(std::locale::classic());
utility::string_t s;
while (std::getline(iss, s, _XPLATSTR('/')))
{
if (!s.empty())
{
results.push_back(s);
}
}
return results;
}
std::map<utility::string_t, utility::string_t> uri::split_query(const utility::string_t& query)
{
std::map<utility::string_t, utility::string_t> results;
// Split into key value pairs separated by '&'.
size_t prev_amp_index = 0;
while (prev_amp_index != utility::string_t::npos)
{
size_t amp_index = query.find_first_of(_XPLATSTR('&'), prev_amp_index);
if (amp_index == utility::string_t::npos) amp_index = query.find_first_of(_XPLATSTR(';'), prev_amp_index);
utility::string_t key_value_pair = query.substr(
prev_amp_index,
amp_index == utility::string_t::npos ? query.size() - prev_amp_index : amp_index - prev_amp_index);
prev_amp_index = amp_index == utility::string_t::npos ? utility::string_t::npos : amp_index + 1;
size_t equals_index = key_value_pair.find_first_of(_XPLATSTR('='));
if (equals_index == utility::string_t::npos)
{
continue;
}
else if (equals_index == 0)
{
utility::string_t value(key_value_pair.begin() + equals_index + 1, key_value_pair.end());
results[utility::string_t {}] = value;
}
else
{
utility::string_t key(key_value_pair.begin(), key_value_pair.begin() + equals_index);
utility::string_t value(key_value_pair.begin() + equals_index + 1, key_value_pair.end());
results[key] = value;
}
}
return results;
}
bool uri::validate(const utility::string_t& uri_string)
{
details::inner_parse_out out;
return out.parse_from(uri_string.c_str());
}
uri uri::authority() const
{
return uri_builder()
.set_scheme(this->scheme())
.set_host(this->host())
.set_port(this->port())
.set_user_info(this->user_info())
.to_uri();
}
uri uri::resource() const
{
return uri_builder().set_path(this->path()).set_query(this->query()).set_fragment(this->fragment()).to_uri();
}
bool uri::operator==(const uri& other) const
{
// Each individual URI component must be decoded before performing comparison.
// TFS # 375865
if (this->is_empty() && other.is_empty())
{
return true;
}
else if (this->is_empty() || other.is_empty())
{
return false;
}
else if (this->scheme() != other.scheme())
{
// scheme is canonicalized to lowercase
return false;
}
else if (uri::decode(this->user_info()) != uri::decode(other.user_info()))
{
return false;
}
else if (uri::decode(this->host()) != uri::decode(other.host()))
{
// host is canonicalized to lowercase
return false;
}
else if (this->port() != other.port())
{
return false;
}
else if (uri::decode(this->path()) != uri::decode(other.path()))
{
return false;
}
else if (uri::decode(this->query()) != uri::decode(other.query()))
{
return false;
}
else if (uri::decode(this->fragment()) != uri::decode(other.fragment()))
{
return false;
}
return true;
}
// resolving URI according to RFC3986, Section 5 https://tools.ietf.org/html/rfc3986#section-5
utility::string_t uri::resolve_uri(const utility::string_t& relativeUri) const
{
if (relativeUri.empty())
{
return to_string();
}
if (relativeUri[0] == _XPLATSTR('/')) // starts with '/'
{
if (relativeUri.size() >= 2 && relativeUri[1] == _XPLATSTR('/')) // starts with '//'
{
return this->scheme() + _XPLATSTR(':') + relativeUri;
}
// otherwise relative to root
auto builder = uri_builder(this->authority());
builder.append(relativeUri);
details::removeDotSegments(builder);
return builder.to_string();
}
const auto url = uri(relativeUri);
if (!url.scheme().empty()) return relativeUri;
if (!url.authority().is_empty())
{
return uri_builder(url).set_scheme(this->scheme()).to_string();
}
// relative url
auto builder = uri_builder(*this);
if (url.path() == _XPLATSTR("/") || url.path().empty()) // web::uri considers empty path as '/'
{
if (!url.query().empty())
{
builder.set_query(url.query());
}
}
else if (!this->path().empty())
{
builder.set_path(details::mergePaths(this->path(), url.path()));
details::removeDotSegments(builder);
builder.set_query(url.query());
}
return builder.set_fragment(url.fragment()).to_string();
}
} // namespace web