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tastytea 2020-11-13 21:27:54 +01:00
commit 54afa6babf
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# -*- mode: yaml -*-
# Written for clang-format 10.
# https://releases.llvm.org/10.0.0/tools/clang/docs/ClangFormatStyleOptions.html
---
DisableFormat: false
Language: Cpp
AccessModifierOffset: -4
AlignAfterOpenBracket: Align
AlignConsecutiveAssignments: false
# AlignConsecutiveBitFields: false # clang-format 11
AlignConsecutiveDeclarations: false
AlignConsecutiveMacros: false
AlignEscapedNewlines: DontAlign
AlignOperands: true # clang-format 11: Align
AlignTrailingComments: true
AllowAllArgumentsOnNextLine: false
AllowAllConstructorInitializersOnNextLine: false
AllowAllParametersOfDeclarationOnNextLine: false
AllowShortBlocksOnASingleLine: Empty
AllowShortCaseLabelsOnASingleLine: false
# AllowShortEnumsOnASingleLine: false # clang-format 11
AllowShortFunctionsOnASingleLine: Empty
AllowShortIfStatementsOnASingleLine: Never
AllowShortLambdasOnASingleLine: Inline
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterReturnType: None
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: Yes
BinPackArguments: true
BinPackParameters: true
BraceWrapping: # If BreakBeforeBraces is set to Custom.
AfterCaseLabel: true
AfterClass: true
AfterControlStatement: Always
AfterEnum: true
AfterFunction: true
AfterNamespace: true
AfterStruct: true
AfterUnion: true
AfterExternBlock: true
BeforeCatch: true
BeforeElse: true
# BeforeLambdaBody: true # clang-format 11
# BeforeWhile: true # clang-format 11
IndentBraces: false
SplitEmptyFunction: false
SplitEmptyRecord: false
SplitEmptyNamespace: false
BreakBeforeBinaryOperators: NonAssignment
BreakBeforeBraces: Custom
BreakBeforeTernaryOperators: true
BreakConstructorInitializers: BeforeComma
BreakInheritanceList: BeforeComma
BreakStringLiterals: true
ColumnLimit: 80
# CommentPragmas: 'regex'
CompactNamespaces: false
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 4
ContinuationIndentWidth: 4
Cpp11BracedListStyle: true
DeriveLineEnding: true
DerivePointerAlignment: false
FixNamespaceComments: true
ForEachMacros:
- FOREACH
- RANGES_FOR
- Q_FOREACH
- BOOST_FOREACH
IncludeBlocks: Regroup
IncludeCategories: # stdlib headers into own group.
- Regex: '^[^\.]+$'
Priority: 4
# IndentCaseBlocks: false # clang-format 11
IndentCaseLabels: false
# IndentExternBlock: NoIndent # clang-format 11
IndentGotoLabels: false
IndentPPDirectives: AfterHash
IndentWidth: 4
IndentWrappedFunctionNames: false
KeepEmptyLinesAtTheStartOfBlocks: true
# MacroBlockBegin: 'string'
# MacroBlockEnd: 'string'
MaxEmptyLinesToKeep: 1
NamespaceIndentation: None
# NamespaceMacros: 'string'
PenaltyBreakAssignment: 250
PenaltyBreakBeforeFirstCallParameter: 300
# PenaltyBreakComment: 300
# PenaltyBreakFirstLessLess: 120
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# PenaltyBreakTemplateDeclaration: 10
# PenaltyExcessCharacter: 1000000
# PenaltyReturnTypeOnItsOwnLine: 60
PointerAlignment: Right
# RawStringFormats: # <YAML>
ReflowComments: true
SortIncludes: true
SortUsingDeclarations: true
SpaceAfterCStyleCast: false
SpaceAfterLogicalNot: false
SpaceAfterTemplateKeyword: false
SpaceBeforeAssignmentOperators: true
SpaceBeforeCpp11BracedList: false
SpaceBeforeCtorInitializerColon: true
SpaceBeforeInheritanceColon: true
SpaceBeforeParens: ControlStatements
SpaceBeforeRangeBasedForLoopColon: true
SpaceBeforeSquareBrackets: false
SpaceInEmptyBlock: false
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 1
SpacesInAngles: false
SpacesInCStyleCastParentheses: false
SpacesInConditionalStatement: false
SpacesInContainerLiterals: false
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard: Auto
# StatementMacros:
# - Q_UNUSED
# - QT_REQUIRE_VERSION
TabWidth: 4
# TypenameMacros:
# - STACK_OF
# - LIST
UseCRLF: false
UseTab: Never
# WhitespaceSensitiveMacros: ['string', 'string'] # clang-format 11
...

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# Configuration file for EditorConfig.
# More information is available under <https://editorconfig.org/>.
root = true
[*]
indent_style = space
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true
max_line_length = 80
[*.?pp]
indent_size = 4
tab_width = 4
[{CMakeLists.txt,*.cmake}]
indent_size = 2
tab_width = 2

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/build/

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# Support version 3.9 and above, but use policy settings up to 3.17.
cmake_minimum_required(VERSION 3.9...3.17)
# Ranges are supported from 3.12, set policy to current for < 3.12.
if(${CMAKE_VERSION} VERSION_LESS 3.12)
cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
endif()
project(curl_wrapper
VERSION 0.1.0
DESCRIPTION "Light libcurl wrapper."
LANGUAGES CXX)
option(WITH_CURL_WRAPPER_TESTS "Compile tests for curl_wrapper." NO)
option(WITH_CURL_WRAPPER_DOC "Compile API reference for curl_wrapper." NO)
find_package(CURL 7.52 REQUIRED)
add_subdirectory("src")
if(WITH_CURL_WRAPPER_TESTS)
add_subdirectory("tests")
endif()
if(WITH_CURL_WRAPPER_DOC)
include("cmake/Doxygen.cmake")
enable_doxygen("src")
endif()

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If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Remote Network Interaction; Use with the GNU General Public License.
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your version
supports such interaction) an opportunity to receive the Corresponding
Source of your version by providing access to the Corresponding Source
from a network server at no charge, through some standard or customary
means of facilitating copying of software. This Corresponding Source
shall include the Corresponding Source for any work covered by version 3
of the GNU General Public License that is incorporated pursuant to the
following paragraph.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the work with which it is combined will remain governed by version
3 of the GNU General Public License.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU Affero General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU Affero General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU Affero General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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= curl_wrapper
:project: curl_wrapper
:uri-base: https://schlomp.space/tastytea/{project}
:uri-cmake: https://cmake.org/
:uri-libcurl: https://curl.haxx.se/libcurl/
:uri-catch: https://github.com/catchorg/Catch2
:uri-doxygen: http://www.doxygen.nl/
Light libcurl wrapper for when you need to GET a website with minimum effort.
This is _not_ supposed to be a package on its own, but a thing you drop into
your project.
I made this because the curl wrapper I used before is no longer maintained and
the other wrappers are either incomplete or unmaintained as well. _I do not
guarantee anything, use at your own risk._
URL: <{uri-base}>.
== Example program
[source,cpp]
--------------------------------------------------------------------------------
#include "curl_wrapper.hpp"
#include <iostream>
namespace cw = curl_wrapper;
int main()
{
cw::CURLWrapper curl;
const auto answer{curl.make_http_request(cw::http_method::GET,
"http://example.com/")};
if (answer)
{
std::cout << answer;
}
}
--------------------------------------------------------------------------------
== Use with CMake
Drop this project into a subfolder in your project tree. It will be compiled as
a static library.
[source,cmake]
--------------------------------------------------------------------------------
add_subdirectory(curl_wrapper)
add_executable(test)
target_link_libraries(test PRIVATE curl_wrapper)
--------------------------------------------------------------------------------
.CMake options:
* `-DWITH_CURL_WRAPPER_TESTS=YES` Compiles the tests.
* `-DWITH_CURL_WRAPPER_DOC=YES` Generate API reference.
== Dependencies
* C++17
* link:{uri-cmake}[CMake] >= 3.9
* link:{uri-libcurl}[libcurl] >= 7.52
* Optional:
** Tests: link:{uri-catch}[Catch] >= 1.2
** Documentation: link:{uri-doxygen}[Doxygen] >= 1.8

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function(enable_doxygen)
find_package(Doxygen REQUIRED dot)
set(DOXYGEN_RECURSIVE YES)
set(DOXYGEN_GENERATE_HTML YES)
set(DOXYGEN_HTML_OUTPUT "doc/html")
set(DOXYGEN_GENERATE_LATEX NO)
set(DOXYGEN_ALLOW_UNICODE_NAMES YES)
set(DOXYGEN_BRIEF_MEMBER_DESC YES)
set(DOXYGEN_REPEAT_BRIEF YES)
set(DOXYGEN_ALWAYS_DETAILED_SEC YES)
set(DOXYGEN_INLINE_INHERITED_MEMB NO)
set(DOXYGEN_INHERIT_DOCS YES)
set(DOXYGEN_SEPARATE_MEMBER_PAGES NO)
set(DOXYGEN_TAB_SIZE 4)
set(DOXYGEN_MARKDOWN_SUPPORT YES)
set(DOXYGEN_AUTOLINK_SUPPORT YES)
set(DOXYGEN_INLINE_SIMPLE_STRUCTS NO)
set(DOXYGEN_QUIET YES)
set(DOXYGEN_WARNINGS YES)
set(DOXYGEN_WARN_IF_UNDOCUMENTED YES)
set(DOXYGEN_BUILTIN_STL_SUPPORT YES)
set(DOXYGEN_VERBATIM_HEADERS YES)
set(DOXYGEN_INLINE_SOURCES YES)
set(DOXYGEN_SEARCHENGINE YES)
set(DOXYGEN_SHOW_FILES YES)
file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/doc")
doxygen_add_docs(${PROJECT_NAME}_doxygen "${ARGV}")
# Make sure doxygen is run with every build.
add_custom_target(${PROJECT_NAME}_docs ALL DEPENDS ${PROJECT_NAME}_doxygen)
endfunction()

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file(GLOB sources "*.cpp")
file(GLOB headers "*.hpp")
add_library(${PROJECT_NAME} STATIC ${sources} ${headers})
unset(sources)
unset(headers)
set_target_properties(${PROJECT_NAME}
PROPERTIES
CXX_STANDARD 17
CXX_STANDARD_REQUIRED ON
CXX_EXTENSIONS OFF)
# FindCURL provides an IMPORTED target since CMake 3.12.
if(NOT ${CMAKE_VERSION} VERSION_LESS 3.12)
target_link_libraries(${PROJECT_NAME} PUBLIC CURL::libcurl)
else()
target_include_directories(${PROJECT_NAME} PUBLIC ${CURL_INCLUDE_DIRS})
target_link_libraries(${PROJECT_NAME} PUBLIC ${CURL_LIBRARIES})
endif()
target_include_directories(${PROJECT_NAME}
PUBLIC "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src>")

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/* This file is part of curl_wrapper.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "curl_wrapper.hpp"
#include "types.hpp"
#include <curl/curl.h>
#include <atomic>
#include <cstdint>
#include <exception>
#include <stdexcept>
#include <string>
namespace curl_wrapper
{
inline static std::atomic<std::uint64_t> curlwrapper_instances{0};
CURLWrapper::CURLWrapper()
{
if (curlwrapper_instances == 0)
{
// NOLINTNEXTLINE(hicpp-signed-bitwise)
check(curl_global_init(CURL_GLOBAL_ALL));
}
++curlwrapper_instances;
_connection = curl_easy_init();
if (_connection == nullptr)
{
throw std::runtime_error{"Failed to initialize curl."};
}
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_ERRORBUFFER, _buffer_error);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_WRITEFUNCTION, writer_body_wrapper);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_WRITEDATA, this);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_HEADERFUNCTION,
writer_headers_wrapper);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_HEADERDATA, this);
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_FOLLOWLOCATION, 1L));
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_MAXREDIRS, 5L);
}
CURLWrapper::~CURLWrapper() noexcept
{
curl_easy_cleanup(_connection);
--curlwrapper_instances;
if (curlwrapper_instances == 0)
{
curl_global_cleanup();
}
}
string CURLWrapper::escape_url(const string_view url) const
{
char *cbuf{curl_easy_escape(_connection, url.data(),
static_cast<int>(url.size()))};
string sbuf{cbuf};
curl_free(cbuf);
return sbuf;
}
string CURLWrapper::unescape_url(const string_view url) const
{
char *cbuf{curl_easy_unescape(_connection, url.data(),
static_cast<int>(url.size()), nullptr)};
string sbuf{cbuf};
curl_free(cbuf);
return sbuf;
}
void CURLWrapper::set_useragent(const string_view useragent)
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_USERAGENT, useragent.data()));
}
void CURLWrapper::set_proxy(const string_view proxy)
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_PROXY, proxy.data()));
}
answer CURLWrapper::make_http_request(http_method method, string_view uri)
{
_buffer_headers.clear();
_buffer_body.clear();
switch (method)
{
case http_method::DELETE:
{
// NOTE: Use CURLOPT_MIMEPOST, then set to DELETE to send data.
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_CUSTOMREQUEST, "DELETE"));
break;
}
case http_method::GET:
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_HTTPGET, 1L);
break;
}
case http_method::HEAD:
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_CUSTOMREQUEST, "HEAD"));
break;
}
case http_method::PATCH:
{
// NOTE: Use CURLOPT_MIMEPOST, then set to PATCH to send data.
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_CUSTOMREQUEST, "PATCH"));
break;
}
case http_method::POST:
{
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
curl_easy_setopt(_connection, CURLOPT_POST, 1L);
// NOTE: Use CURLOPT_MIMEPOST to send data.
break;
}
case http_method::PUT:
{
// NOTE: Use CURLOPT_MIMEPOST, then set to PUT to send data.
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_CUSTOMREQUEST, "PUT"));
break;
}
}
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_setopt(_connection, CURLOPT_URL, uri.data()));
try
{
check(curl_easy_perform(_connection));
}
catch (const CURLException &e)
{
// PARTIAL_FILE error seems to be normal for HEAD requests.
if (!(method == http_method::HEAD
&& e.error_code == CURLE_PARTIAL_FILE))
{
std::rethrow_exception(std::current_exception());
}
}
long http_status{0}; // NOLINT(google-runtime-int)
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
check(curl_easy_getinfo(_connection, CURLINFO_RESPONSE_CODE, &http_status));
return {static_cast<std::uint16_t>(http_status), _buffer_headers,
_buffer_body};
}
size_t CURLWrapper::writer_body(char *data, size_t size, size_t nmemb)
{
if (data == nullptr)
{
return 0;
}
_buffer_body.append(data, size * nmemb);
return size * nmemb;
}
size_t CURLWrapper::writer_headers(char *data, size_t size, size_t nmemb)
{
if (data == nullptr)
{
return 0;
}
_buffer_headers.append(data, size * nmemb);
return size * nmemb;
}
void CURLWrapper::check(const CURLcode code)
{
if (code != CURLE_OK)
{
throw CURLException{code, _buffer_error};
}
}
const char *CURLException::what() const noexcept
{
// NOTE: The string has to be static, or it'll vanish before it can be
// used. Couldn't find good documentation on that.
static string error_string;
error_string = _error_message;
if (!error_string.empty())
{
error_string = " – " + error_string;
}
error_string = "libcurl error: " + std::to_string(error_code)
+ error_string;
return error_string.c_str();
}
} // namespace curl_wrapper

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/* This file is part of curl_wrapper.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CURL_WRAPPER_HPP
#define CURL_WRAPPER_HPP
#include "types.hpp"
#include <curl/curl.h>
#include <exception>
#include <string>
#include <string_view>
namespace curl_wrapper
{
using std::string;
using std::string_view;
/*!
* @brief Light wrapper around libcurl.
*
* @since 0.1.0
*/
class CURLWrapper
{
public:
/*!
* @brief Initializes curl and sets up connection.
*
* The first time an instance of CURLWrapper is created, it calls
* `curl_global_init`, which is not thread-safe. For more information
* consult [curl_global_init(3)]
* (https://curl.haxx.se/libcurl/c/curl_global_init.html).
*
* May throw CURLException or std::runtime_error.
*
* @since 0.1.0
*/
CURLWrapper();
/*!
* @brief Cleans up curl and connection.
*
* Calls `curl_global_cleanup`, which is not thread-safe, when the last
* instance of CURLWrapper is destroyed. For more information consult
* [curl_global_cleanup(3)]
* (https://curl.haxx.se/libcurl/c/curl_global_cleanup.html).
*
* @since 0.1.0
*/
virtual ~CURLWrapper() noexcept;
//! Copy constructor. @since 0.1.0
CURLWrapper(const CURLWrapper &other) = delete;
//! Move constructor @since 0.1.0
CURLWrapper(CURLWrapper &&other) noexcept = delete;
//! Copy assignment operator @since 0.1.0
CURLWrapper &operator=(const CURLWrapper &other) = delete;
//! Move assignment operator @since 0.1.0
CURLWrapper &operator=(CURLWrapper &&other) noexcept = delete;
/*!
* @brief Returns pointer to the CURL easy handle.
*
* You can use this handle to set or modify curl options. For more
* information consult [curl_easy_setopt(3)]
* (https://curl.haxx.se/libcurl/c/curl_easy_setopt.html).
*
* @since 0.1.0
*/
[[nodiscard]] inline CURL *get_curl_easy_handle() const
{
return _connection;
}
/*!
* @brief URL encodes the given string.
*
* For more information consult [curl_easy_escape(3)]
* (https://curl.haxx.se/libcurl/c/curl_easy_escape.html).
*
* @param url String to escape.
*
* @return The escaped string or {} if it failed.
*
* @since 0.1.0
*/
[[nodiscard]] string escape_url(string_view url) const;
/*!
* @brief URL decodes the given string.
*
* For more information consult [curl_easy_unescape(3)]
* (https://curl.haxx.se/libcurl/c/curl_easy_unescape.html).
*
* @param url String to unescape.
*
* @return The unescaped string or {} if it failed.
*
* @since 0.1.0
*/
[[nodiscard]] string unescape_url(string_view url) const;
/*!
* @brief Set the User-Agent.
*
* May throw CURLException.
*
* @since 0.1.0
*/
void set_useragent(string_view useragent);
/*!
* @brief Set a proxy.
*
* For more information consult [CURLOPT_PROXY(3)]
* (https://curl.haxx.se/libcurl/c/CURLOPT_PROXY.html).
*
* May throw CURLException.
*
* @since 0.1.1
*/
void set_proxy(string_view proxy);
/*!
* @brief Make a HTTP request.
*
* May throw CURLException.
*
* @param method The HTTP method.
* @param uri The full URI.
*
* @return The status code, headers and body of the page.
*
* @since 0.1.0
*/
[[nodiscard]] answer make_http_request(http_method method, string_view uri);
private:
CURL *_connection{};
char _buffer_error[CURL_ERROR_SIZE]{};
string _buffer_headers;
string _buffer_body;
/*!
* @brief libcurl write callback function.
*
* @since 0.1.0
*/
size_t writer_body(char *data, size_t size, size_t nmemb);
/*!
* @brief Wrapper for curl, because it can only call static member
* functions.
*
* <https://curl.haxx.se/docs/faq.html#Using_C_non_static_functions_f>
*
* @since 0.1.0
*/
static inline size_t writer_body_wrapper(char *data, size_t sz,
size_t nmemb, void *f)
{
return static_cast<CURLWrapper *>(f)->writer_body(data, sz, nmemb);
}
//! @copydoc writer_body
size_t writer_headers(char *data, size_t size, size_t nmemb);
//! @copydoc writer_body_wrapper
static inline size_t writer_headers_wrapper(char *data, size_t sz,
size_t nmemb, void *f)
{
return static_cast<CURLWrapper *>(f)->writer_headers(data, sz, nmemb);
}
/*!
* @brief Throw CURLException if command doesn't return CURLE_OK.
*
* @since 0.1.0
*/
void check(CURLcode code);
};
/*!
* @brief Exception for libcurl errors.
*
* @since 0.1.0
*/
class CURLException : public std::exception
{
public:
/*!
* @brief Constructor with error code.
*
* @since 0.1.0
*/
explicit CURLException(const CURLcode code)
: error_code{code}
{}
/*!
* @brief Constructor with error code and error buffer.
*
* @since 0.1.0
*/
explicit CURLException(const CURLcode code, string_view error_buffer)
: error_code{code}
, _error_message{error_buffer}
{}
const CURLcode error_code; //!< Error code from libcurl.
/*!
* @brief Error message.
*
* @since 0.1.0
*/
[[nodiscard]] const char *what() const noexcept override;
private:
string _error_message;
};
} // namespace curl_wrapper
#endif // CURL_WRAPPER_HPP

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/* This file is part of curl_wrapper.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "types.hpp"
#include <algorithm>
#include <cctype>
#include <string>
#include <string_view>
namespace curl_wrapper
{
using std::tolower;
std::string_view answer::get_header(const std::string_view field) const
{
const string searchstring{string(field) += ":"};
// clang-format off
auto it{std::search(headers.begin(), headers.end(), searchstring.begin(),
searchstring.end(),
[](unsigned char a, unsigned char b)
{ return tolower(a) == tolower(b); })};
// clang-format on
if (it != headers.end())
{
auto pos{static_cast<size_t>(it - headers.begin())};
pos = headers.find(':', pos) + 1;
pos = headers.find_first_not_of(' ', pos);
const auto endpos{headers.find_first_of("\r\n", pos)};
return string_view(&headers[pos], endpos - pos);
}
return {};
}
} // namespace curl_wrapper

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/* This file is part of curl_wrapper.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CURL_WRAPPER_TYPES_HPP
#define CURL_WRAPPER_TYPES_HPP
#include <cstdint>
#include <ostream>
#include <string>
#include <string_view>
namespace curl_wrapper
{
using std::ostream;
using std::string;
using std::string_view;
/*!
* @brief The HTTP method.
*
* @since 0.1.0
*/
enum class http_method
{
DELETE,
GET,
HEAD,
PATCH,
POST,
PUT
};
/*!
* @brief Return type for network requests.
*
* Currently only HTTP is considered.
*
* @since 0.1.0
*/
struct answer
{
std::uint16_t status{0}; //!< Status code.
string headers; //!< The headers of the response from the server.
string body; //!< The response from the server.
/*!
* @brief Returns true if #status is 200.
*
* @since 0.1.0
*/
[[nodiscard]] inline explicit operator bool() const
{
return (status == 200);
}
/*!
* @brief Returns std::string_view of the #body.
*
* @since 0.1.0
*/
[[nodiscard]] inline explicit operator string_view() const
{
return body;
}
/*!
* @brief Returns #body as std::ostream.
*
* @since 0.1.0
*/
inline friend ostream &operator<<(ostream &out, const answer &answer)
{
out << answer.body;
return out;
}
/*!
* @brief Returns the value of a header field.
*
* @param field Case insensitive, ASCII only.
*
* @return A std::string_view to the value of the header field or {} if not
* found.
*
* @since 0.1.0
*/
[[nodiscard]] string_view get_header(string_view field) const;
};
} // namespace curl_wrapper
#endif // CURL_WRAPPER_TYPES_HPP

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include(CTest)
file(GLOB sources_tests "test_*.cpp")
find_package(Catch2 CONFIG)
if(Catch2_FOUND) # Catch 2.x
include(Catch)
add_executable(all_tests main.cpp ${sources_tests})
set_target_properties(all_tests
PROPERTIES
CXX_STANDARD 17
CXX_STANDARD_REQUIRED ON
CXX_EXTENSIONS OFF)
target_link_libraries(all_tests
PRIVATE Catch2::Catch2 ${PROJECT_NAME})
target_include_directories(all_tests PRIVATE "/usr/include/catch2")
catch_discover_tests(all_tests EXTRA_ARGS "${EXTRA_TEST_ARGS}")
else() # Catch 1.x
if(EXISTS "/usr/include/catch.hpp")
message(STATUS "Catch 1.x found.")
foreach(src ${sources_tests})
get_filename_component(bin "${src}" NAME_WE)
add_executable(${bin} "main.cpp" "${src}")
set_target_properties(${bin}
PROPERTIES
CXX_STANDARD 17
CXX_STANDARD_REQUIRED ON
CXX_EXTENSIONS OFF)
target_link_libraries(${bin}
PRIVATE ${PROJECT_NAME})
add_test(${bin} ${bin} "${EXTRA_TEST_ARGS}")
endforeach()
else()
message(FATAL_ERROR
"Neither Catch 2.x nor Catch 1.x could be found.")
endif()
endif()

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#define CATCH_CONFIG_MAIN
#include <catch.hpp>

62
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#include "curl_wrapper.hpp"
#include <catch.hpp>
#include <exception>
#include <string>
namespace curl_wrapper
{
using std::string;
SCENARIO("URL encoding / decoding")
{
const string text_raw{"Hüpfburg am rande!"};
const string text_escaped("H%C3%BCpfburg%20am%20rande%21");
bool exception = false;
string answer;
WHEN("Encoding " + text_raw)
{
try
{
CURLWrapper curl;
answer = curl.escape_url(text_raw);
}
catch (const std::exception &e)
{
exception = true;
}
THEN("No exception is thrown")
AND_THEN("The text is successfully encoded")
{
REQUIRE_FALSE(exception);
REQUIRE(answer == text_escaped);
}
}
WHEN("Decoding " + text_escaped)
{
try
{
CURLWrapper curl;
answer = curl.unescape_url(text_escaped);
}
catch (const std::exception &e)
{
exception = true;
}
THEN("No exception is thrown")
AND_THEN("The text is successfully decoded")
{
REQUIRE_FALSE(exception);
REQUIRE(answer == text_raw);
}
}
}
} // namespace curl_wrapper

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#include "curl_wrapper.hpp"
#include <catch.hpp>
#include <exception>
#include <string>
namespace curl_wrapper
{
using std::string;
SCENARIO("HTTP GET", "[http]")
{
const string uri{"https://schlomp.space/api/v1/version"};
bool exception = false;
string answer;
WHEN("GETing " + uri)
{
try
{
CURLWrapper curl;
answer = curl.make_http_request(http_method::GET, uri).body;
}
catch (const std::exception &e)
{
exception = true;
}
THEN("No exception is thrown")
AND_THEN("We get the right answer")
{
REQUIRE_FALSE(exception);
REQUIRE(answer.substr(0, 11) == R"({"version":)");
}
}
}
} // namespace curl_wrapper

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#include "types.hpp"
#include <catch.hpp>
#include <exception>
#include <iostream>
#include <locale>
#include <string>
namespace curl_wrapper
{
using std::string;
SCENARIO("Extract header")
{
answer ret;
ret.headers = R"(HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Sat, 07 Nov 2020 22:26:13 GMT
Content-Type: application/rss+xml; charset=utf-8
Connection: keep-alive
Keep-Alive: timeout=20
Expires: Sat, 07 Nov 2020 22:56:13 GMT
Cache-Control: max-age=1800
X-Cache: HIT
X-UmläÜt: 🙂
)";
bool exception = false;
string value;
WHEN("We search for “cache-control”")
{
try
{
value = ret.get_header("cache-control");
}
catch (const std::exception &e)
{
std::cerr << "Exception: " << e.what() << '\n';
exception = true;
}
THEN("No exception is thrown")
AND_THEN("The value is successfully extracted")
{
REQUIRE_FALSE(exception);
REQUIRE(value == "max-age=1800");
}
}
// WHEN("We search for “X-UMLÄÜT”")
// {
// std::locale::global(std::locale("de_DE.UTF-8"));
//
// try
// {
// value = ret.get_header("X-UMLÄÜT");
// }
// catch (const std::exception &e)
// {
// std::cerr << "Exception: " << e.what() << '\n';
// exception = true;
// }
// THEN("No exception is thrown")
// AND_THEN("The value is successfully extracted")
// {
// REQUIRE_FALSE(exception);
// REQUIRE(value == "🙂");
// }
// }
}
} // namespace curl_wrapper