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tastytea 2020-11-21 21:44:17 +01:00
commit 1d4139cf0e
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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
# PenaltyBreakString: 1000
# 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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# -*- fill-column: 1000 -*-
kind: pipeline
name: Build x86_64
platform:
os: linux
arch:
volumes:
- name: debian-package-cache
host:
path: /var/cache/debian-package-cache
trigger:
event:
exclude:
- tag
steps:
- name: GCC 9 & 10 / clang 10
image: ubuntu:focal
pull: always
environment:
CXX: g++-9
CXXFLAGS: -pipe -O2
DEBIAN_FRONTEND: noninteractive
LANG: C.utf8
commands:
- rm /etc/apt/apt.conf.d/docker-clean
- alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
- apt-get update -q
- apt-get install -qq build-essential cmake g++-10 clang
- apt-get install -qq catch libcurl4-openssl-dev
- rm -rf build && mkdir -p build && cd build
- cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
- cd ../../
- rm -rf build && mkdir -p build && cd build
- CXX="g++-10" cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
- cd ../../
- rm -rf build && mkdir -p build && cd build
- CXX="clang++" cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
volumes:
- name: debian-package-cache
path: /var/cache/apt/archives
- name: GCC 8 / clang 7
image: debian:buster-slim
pull: always
environment:
CXX: g++-8
CXXFLAGS: -pipe -O2
DEBIAN_FRONTEND: noninteractive
LANG: C.utf8
commands:
- rm /etc/apt/apt.conf.d/docker-clean
- alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
- apt-get update -q
- apt-get install -qq build-essential cmake clang
- apt-get install -qq catch libcurl4-openssl-dev
- rm -rf build && mkdir -p build && cd build
- cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
- cd ../../
- rm -rf build && mkdir -p build && cd build
- CXX="clang++" cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
volumes:
- name: debian-package-cache
path: /var/cache/apt/archives
- name: GCC 7 / clang 6
image: ubuntu:bionic
pull: always
environment:
CXX: g++-7
CXXFLAGS: -pipe -O2
DEBIAN_FRONTEND: noninteractive
LANG: C.utf8
nlohmann_json_DIR: "/usr/lib/cmake"
pugixml_DIR: "/usr/share/libpugixml-dev/cmake"
commands:
- rm /etc/apt/apt.conf.d/docker-clean
- alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
- apt-get update -q
- apt-get install -qq build-essential cmake clang pkg-config
- apt-get install -qq catch libcurl4-gnutls-dev
- rm -rf build && mkdir -p build && cd build
- cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
- cd ../../
- rm -rf build && mkdir -p build && cd build
- CXX="clang++" cmake -G "Unix Makefiles" -DWITH_CURL_WRAPPER_TESTS=YES ..
- make VERBOSE=1
- cd tests && ctest -V
volumes:
- name: debian-package-cache
path: /var/cache/apt/archives
- name: notify
image: drillster/drone-email
pull: always
settings:
host: mail.tzend.de
from: drone@tzend.de
username:
from_secret: email_username
password:
from_secret: email_password
when:
status: [ changed, failure ]

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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 0.1.1
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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How to Apply These Terms to Your New Programs
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possible use to the public, the best way to achieve this is to make it
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state the exclusion of warranty; and each file should have at least
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<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
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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
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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
:toc: preamble
: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/
:uri-git-subtree: https://manpages.debian.org/testing/git-man/git-subtree.1.en.html
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.
== Add with `git subtree`
Replace `src/curl_wrapper` with the path you want it to be in. Consult
link:{uri-git-subtree}[git-subtree(1)] for more information.
[source,shell]
--------------------------------------------------------------------------------
git remote add curl_wrapper https://schlomp.space/tastytea/curl_wrapper.git
git subtree add --prefix=src/curl_wrapper curl_wrapper main --squash
--------------------------------------------------------------------------------
=== Update subtree
[source,shell]
--------------------------------------------------------------------------------
git subtree pull --prefix=src/curl_wrapper curl_wrapper main --squash
--------------------------------------------------------------------------------
== 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
POSITION_INDEPENDENT_CODE ON)
# 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

244
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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>

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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