Replace POCO with CURL.

.drone.yml

@@ -1,3 +1,4 @@
+# -*- fill-column: 1000 -*-
 kind: pipeline
 name: on_push
 
@@ -30,7 +31,7 @@ steps:
   - gpg --armor --export 0x60c317803a41ba51845e371a1e9377a2ba9ef27f | apt-key add -
   - apt-get update -q
   - apt-get install -qy -t xenial g++-5
-  - apt-get install -qy cmake pkg-config libpoco-dev libjsoncpp-dev asciidoc
+  - apt-get install -qy cmake pkg-config libcurl4-openssl-dev libjsoncpp-dev asciidoc
   - rm -rf build && mkdir -p build && cd build
   - cmake ..
   - make VERBOSE=1
@@ -56,7 +57,7 @@ steps:
   - gpg --armor --export 0x60c317803a41ba51845e371a1e9377a2ba9ef27f | apt-key add -
   - apt-get update -q
   - apt-get install -qy -t xenial g++-9
-  - apt-get install -qy cmake pkg-config libpoco-dev libjsoncpp-dev asciidoc
+  - apt-get install -qy cmake pkg-config libcurl4-openssl-dev libjsoncpp-dev asciidoc
   - rm -rf build && mkdir -p build && cd build
   - cmake ..
   - make VERBOSE=1
@@ -75,7 +76,7 @@ steps:
   - 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 -qy clang cmake pkg-config libpoco-dev libjsoncpp-dev asciidoc
+  - apt-get install -qy clang cmake pkg-config libcurl4-openssl-dev libjsoncpp-dev asciidoc
   - rm -rf build && mkdir -p build && cd build
   - cmake ..
   - make VERBOSE=1
@@ -94,7 +95,7 @@ steps:
   - 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 -qy clang cmake pkg-config libpoco-dev libjsoncpp-dev asciidoc
+  - apt-get install -qy clang cmake pkg-config libcurl4-openssl-dev libjsoncpp-dev asciidoc
   - rm -rf build && mkdir -p build && cd build
   - cmake ..
   - make VERBOSE=1
@@ -106,7 +107,7 @@ steps:
   image: drillster/drone-email
   pull: always
   settings:
-    host: cryptoparty-celle.de
+    host: mail.tzend.de
     from: drone@tzend.de
     username:
       from_secret: email_username

CMakeLists.txt

@@ -26,8 +26,7 @@ include(cmake/debug_flags.cmake)
 
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(jsoncpp REQUIRED IMPORTED_TARGET jsoncpp)
-# Some distributions do not contain Poco*Config.cmake recipes.
-find_package(Poco COMPONENTS Foundation Net NetSSL CONFIG)
+find_package(CURL 7.56 REQUIRED)
 
 add_subdirectory(src)
 

README.adoc

@@ -31,7 +31,7 @@ emerge -a dev-util/gitea2rss
 * C++ compiler (tested: https://gcc.gnu.org/[gcc] 5/8/9,
   https://llvm.org/[clang] 3/7)
 * https://cmake.org/[cmake] (at least: 3.6)
-* https://pocoproject.org/[POCO] (tested: 1.9 / 1.7)
+* https://curl.haxx.se/libcurl/[libcurl] (at least: 7.56)
 * https://github.com/open-source-parsers/jsoncpp[jsoncpp] (tested: 1.8)
 * Optional:
 ** Manpage: http://asciidoc.org/[asciidoc] (tested: 8.6)
@@ -40,7 +40,7 @@ emerge -a dev-util/gitea2rss
 
 [source,shell]
 ----
-apt-get install build-essential cmake libpoco-dev libjsoncpp-dev asciidoc
+apt-get install build-essential cmake libcurl4-openssl-dev libjsoncpp-dev asciidoc
 ----
 
 ==== Get sourcecode

man/gitea2rss.1.adoc

@@ -2,7 +2,7 @@
 :doctype:       manpage
 :Author:        tastytea
 :Email:         tastytea@tastytea.de
-:Date:          2019-08-09
+:Date:          2020-10-24
 :Revision:      0.0.0
 :man source:    gitea2rss
 :man version:   {revision}
@@ -57,8 +57,8 @@ this in it:
 
 == PROXY SERVERS
 
-*gitea2rss* supports HTTP proxies set via the environment variable
-_http_proxy_. Accepted formats are _http://host:port/_ or _host:port_.
+Since *gitea2rss* is built on libcurl, it respects the same proxy environment
+variables. See *curl*(1), section _ENVIRONMENT_.
 
 == EXAMPLES
 
@@ -95,7 +95,7 @@ _http_proxy_. Accepted formats are _http://host:port/_ or _host:port_.
 
 == SEE ALSO
 
-*crontab*(1), *crontab*(5)
+*crontab*(1), *crontab*(5), *curl*(1)
 
 == REPORTING BUGS
 

src/CMakeLists.txt

@@ -11,26 +11,6 @@ target_include_directories(${PROJECT_NAME}
   PRIVATE "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>")
 
 target_link_libraries(${PROJECT_NAME}
-  PRIVATE PkgConfig::jsoncpp)
-
-# If no Poco*Config.cmake recipes are found, look for headers in standard dirs.
-if(PocoNetSSL_FOUND)
-  target_link_libraries(${PROJECT_NAME}
-    PRIVATE Poco::Foundation Poco::Net Poco::NetSSL)
-else()
-  find_file(Poco_h NAMES "Poco/Poco.h"
-    PATHS "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
-
-  if("${Poco_h}" STREQUAL "Poco_h-NOTFOUND")
-    message(FATAL_ERROR "Could not find POCO.")
-  else()
-    message(WARNING
-      "Your distribution of POCO doesn't contain the *Config.cmake recipes, "
-      "but the files seem to be in the standard directories. "
-      "Let's hope this works.")
-    target_link_libraries(${PROJECT_NAME}
-      PRIVATE PocoFoundation PocoNet PocoNetSSL)
-  endif()
-endif()
+  PRIVATE PkgConfig::jsoncpp CURL::libcurl)
 
 install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})

src/gitea2rss.hpp

@@ -1,5 +1,5 @@
 /*  This file is part of gitea2rss.
- *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *  Copyright © 2019, 2020 tastytea <tastytea@tastytea.de>
  *
  *  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
@@ -17,22 +17,22 @@
 #ifndef GITEA2RSS_HPP
 #define GITEA2RSS_HPP
 
-#include <string>
 #include <chrono>
-#include <ctime>
 #include <cstdint>
+#include <ctime>
+#include <string>
 
 using std::string;
-using std::chrono::system_clock;
 using std::uint8_t;
+using std::chrono::system_clock;
 
 extern bool cgi;
 
-//! Set proxy from environment variable `http_proxy`.
-void set_proxy();
-
 //! Fetch HTTP document.
-const string get_http(const string &url);
+string get_http(const string &url);
+
+// CURL receive function.
+size_t writer_body(char *data, size_t size, size_t nmemb);
 
 //! Convert time_point to RFC 822 compliant time string.
 const string strtime(const system_clock::time_point &timepoint);
@@ -41,7 +41,7 @@ const string strtime(const system_clock::time_point &timepoint);
 const string strtime(const string &time);
 
 //! Write line of XML.
-void write_line(const uint8_t spaces, const string &tag, const string &value);
+void write_line(uint8_t spaces, const string &tag, const string &value);
 
 //! Write the RSS preamble and channel data.
 void write_preamble(const string &url, const string &type);
@@ -67,4 +67,7 @@ const string get_project(const string &url);
 //! Escape some characters to named HTML entities.
 const string escape_some_html(string html);
 
-#endif  // GITEA2RSS_HPP
+//! Return environment variable or "" if it is not set.
+string get_env_var(const string &variable);
+
+#endif // GITEA2RSS_HPP

src/http.cpp

@@ -1,5 +1,5 @@
 /*  This file is part of gitea2rss.
- *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *  Copyright © 2019, 2020 tastytea <tastytea@tastytea.de>
  *
  *  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
@@ -14,142 +14,105 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <iostream>
-#include <exception>
-#include <memory>
-#include <regex>
-#include <Poco/Net/HTTPClientSession.h>
-#include <Poco/Net/HTTPSClientSession.h>
-#include <Poco/Net/HTTPRequest.h>
-#include <Poco/Net/HTTPResponse.h>
-#include <Poco/StreamCopier.h>
-#include <Poco/URI.h>
-#include <Poco/Exception.h>
-#include <Poco/Environment.h>
-#include "version.hpp"
 #include "gitea2rss.hpp"
+#include "version.hpp"
+#include <curl/curl.h>
+#include <exception>
+#include <iostream>
+#include <stdexcept>
+#include <string>
 
-using std::cout;
 using std::cerr;
+using std::cout;
 using std::endl;
-using std::istream;
-using std::unique_ptr;
-using std::make_unique;
-using std::regex;
-using std::regex_search;
-using std::smatch;
-using Poco::Net::HTTPClientSession;
-using Poco::Net::HTTPSClientSession;
-using Poco::Net::HTTPRequest;
-using Poco::Net::HTTPResponse;
-using Poco::Net::HTTPMessage;
-using Poco::StreamCopier;
-using Poco::Environment;
+using std::runtime_error;
+using std::to_string;
 
-void set_proxy()
+string buffer_body;
+
+string get_http(const string &url)
 {
     try
     {
-        HTTPSClientSession::ProxyConfig proxyconfig;
-        string env_proxy = Environment::get("http_proxy");
-        regex re_proxy("^(?:https?://)?(?:([^:]+):?([^@]*)@)?" // user:password
-                       "([^:]+):([[:digit:]]+/?)");            // host:port
-        smatch match;
-
-        if (regex_search(env_proxy, match, re_proxy))
+        curl_global_init(CURL_GLOBAL_ALL); // NOLINT(hicpp-signed-bitwise)
+        CURL *connection{curl_easy_init()};
+        if (connection == nullptr)
         {
-            string username, password;
-            Poco::URI::decode(match[1].str(), username);
-            Poco::URI::decode(match[2].str(), password);
-
-            proxyconfig.host = match[3].str();
-            proxyconfig.port = std::stoi(match[4].str());
-            proxyconfig.username = username;
-            proxyconfig.password = password;
-
-            HTTPSClientSession::setGlobalProxyConfig(proxyconfig);
+            throw runtime_error{"Failed to initialize curl."};
         }
+
+        char buffer_error[256];
+
+        // 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);
+
+        CURLcode code{curl_easy_setopt(connection, CURLOPT_FOLLOWLOCATION, 1L)};
+        if (code != CURLE_OK)
+        {
+            throw runtime_error{"HTTP is not supported."};
+        }
+        // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
+        curl_easy_setopt(connection, CURLOPT_MAXREDIRS, 5L);
+
+        code =
+            curl_easy_setopt(connection, CURLOPT_USERAGENT,
+                             (string("gitea2rss/") += global::version).c_str());
+        if (code != CURLE_OK)
+        {
+            throw runtime_error{"Failed to set User-Agent."};
+        }
+
+        // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
+        curl_easy_setopt(connection, CURLOPT_HTTPGET, 1L);
+
+        code = curl_easy_setopt(connection, CURLOPT_URL, url.c_str());
+        if (code != CURLE_OK)
+        {
+            throw runtime_error{"Couldn't set URL: " + to_string(code)};
+        }
+
+        code = curl_easy_perform(connection);
+        if (code != CURLE_OK)
+        {
+            throw runtime_error{"libcurl error: " + to_string(code)};
+        }
+
+        long http_status{0}; // NOLINT(google-runtime-int)
+        // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
+        curl_easy_getinfo(connection, CURLINFO_RESPONSE_CODE, &http_status);
+
+        curl_easy_cleanup(connection);
+
+        if (http_status == 200)
+        {
+            return buffer_body;
+        }
+
+        if (cgi)
+        {
+            cout << "Status: " << http_status << endl;
+        }
+        throw runtime_error{"HTTP error: " + to_string(http_status)};
     }
-    catch (const std::exception &)
+    catch (const runtime_error &e)
     {
-        // No proxy found, no problem.
-    }
-}
-
-const string get_http(const string &url)
-{
-    try
-    {
-        Poco::URI poco_uri(url);
-        string path = poco_uri.getPathAndQuery();
-        if (path.empty())
-        {
-            path = "/";
-        }
-
-        unique_ptr<HTTPClientSession> session;
-        if (poco_uri.getScheme() == "https")
-        {
-            session = make_unique<HTTPSClientSession>(poco_uri.getHost(),
-                                                      poco_uri.getPort());
-        }
-        else if (poco_uri.getScheme() == "http")
-        {
-            session = make_unique<HTTPClientSession>(poco_uri.getHost(),
-                                                     poco_uri.getPort());
-        }
-        else
-        {
-            throw Poco::Exception("Protocol not supported.");
-        }
-
-        HTTPRequest request(HTTPRequest::HTTP_GET, path, HTTPMessage::HTTP_1_1);
-        request.set("User-Agent", string("gitea2rss/") + global::version);
-
-        HTTPResponse response;
-
-        session->sendRequest(request);
-        istream &rs = session->receiveResponse(response);
-
-        // Not using the constants because some are too new for Debian stretch.
-        switch (response.getStatus())
-        {
-        case 301:               // HTTPResponse::HTTP_MOVED_PERMANENTLY
-        case 308:               // HTTPResponse::HTTP_PERMANENT_REDIRECT
-        case 302:               // HTTPResponse::HTTP_FOUND
-        case 303:               // HTTPResponse::HTTP_SEE_OTHER
-        case 307:               // HTTPResponse::HTTP_TEMPORARY_REDIRECT
-        {
-            string location = response.get("Location");
-            if (location.substr(0, 4) != "http")
-            {
-                location = poco_uri.getScheme() + "://" + poco_uri.getHost()
-                    + location;
-            }
-            return get_http(location);
-        }
-        case HTTPResponse::HTTP_OK:
-        {
-            string answer;
-            StreamCopier::copyToString(rs, answer);
-            return answer;
-        }
-        default:
-        {
-            if (cgi)
-            {
-                cout << "Status: " << response.getStatus() << endl;
-            }
-            cerr << "HTTP Error: " << response.getStatus() << endl;
-
-            return "";
-        }
-        }
-    }
-    catch (const Poco::Exception &e)
-    {
-        cerr << "Error: " << e.displayText() << endl;
+        cerr << "Error: " << e.what() << endl;
     }
 
     return "";
 }
+
+size_t writer_body(char *data, size_t size, size_t nmemb)
+{
+    if (data == nullptr)
+    {
+        return 0;
+    }
+
+    buffer_body.append(data, size * nmemb);
+
+    return size * nmemb;
+}

src/main.cpp

@@ -1,5 +1,5 @@
 /*  This file is part of gitea2rss.
- *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *  Copyright © 2019, 2020 tastytea <tastytea@tastytea.de>
  *
  *  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
@@ -14,33 +14,28 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "gitea2rss.hpp"
+#include "version.hpp"
 #include <iostream>
 #include <string>
-#include <Poco/Net/NetSSL.h>
-#include <Poco/Environment.h>
-#include "version.hpp"
-#include "gitea2rss.hpp"
 
-using std::cout;
 using std::cerr;
+using std::cout;
 using std::endl;
 using std::string;
 using std::chrono::system_clock;
-using Poco::Environment;
 
 int main(int argc, char *argv[])
 {
-    const string query = Environment::get("QUERY_STRING", "");
+
+    const string query{get_env_var("QUERY_STRING")};
     string url;
     string type = "releases";
 
-    Poco::Net::initializeSSL();
-
-    set_proxy();
-
     if (!query.empty())
     {
-        const string baseurl = Environment::get("GITEA2RSS_BASEURL", "");
+        cout << query << " AAAAAAAAA\n";
+        const string baseurl{get_env_var("GITEA2RSS_BASEURL")};
         if (baseurl.empty())
         {
             cout << "Status: 500 Internal Server Error\n\n";
@@ -101,9 +96,7 @@ int main(int argc, char *argv[])
     }
 
     cout << "  </channel>\n"
-        "</rss>\n";
-
-    Poco::Net::uninitializeSSL();
+            "</rss>\n";
 
     return 0;
 }

src/strings.cpp

@@ -1,5 +1,5 @@
 /*  This file is part of gitea2rss.
- *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *  Copyright © 2019, 2020 tastytea <tastytea@tastytea.de>
  *
  *  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
@@ -14,9 +14,12 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "gitea2rss.hpp"
+#include <cstdlib>
 #include <map>
 #include <regex>
-#include "gitea2rss.hpp"
+
+using std::getenv;
 
 const string get_baseurl(const string &url)
 {
@@ -44,11 +47,8 @@ const string get_project(const string &url)
 
 const string escape_some_html(string html)
 {
-    const std::map<const char, const string> names =
-        {
-            { '<', "&lt;" },
-            { '>', "&gt;" }
-        };
+    const std::map<const char, const string> names = {{'<', "&lt;"},
+                                                      {'>', "&gt;"}};
 
     for (auto &pair : names)
     {
@@ -58,3 +58,13 @@ const string escape_some_html(string html)
 
     return html;
 }
+
+string get_env_var(const string &variable)
+{
+    const char *env{getenv(variable.c_str())};
+    if (env != nullptr)
+    {
+        return env;
+    }
+    return "";
+}

src/write.cpp

@@ -1,5 +1,5 @@
 /*  This file is part of gitea2rss.
- *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *  Copyright © 2019, 2020 tastytea <tastytea@tastytea.de>
  *
  *  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
@@ -14,14 +14,14 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "gitea2rss.hpp"
+#include "version.hpp"
+#include <cstdlib>
 #include <iostream>
 #include <regex>
-#include <Poco/Environment.h>
-#include "version.hpp"
-#include "gitea2rss.hpp"
 
 using std::cout;
-using Poco::Environment;
+using std::getenv;
 
 void write_line(const uint8_t spaces, const string &tag, const string &value)
 {
@@ -44,9 +44,9 @@ void write_line(const uint8_t spaces, const string &tag, const string &value)
 
 void write_preamble(const string &url, const string &type)
 {
-    const string request_uri = Environment::get("REQUEST_URI", "");
-    const string server_name = Environment::get("SERVER_NAME", "");
-    const string https = Environment::get("HTTPS", "");
+    const string request_uri{get_env_var("REQUEST_URI")};
+    const string server_name{get_env_var("SERVER_NAME")};
+    const string https{get_env_var("HTTPS")};
     string selfurl;
 
     if (!request_uri.empty() && !server_name.empty())
@@ -64,11 +64,11 @@ void write_preamble(const string &url, const string &type)
     }
 
     cout << "<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">\n"
-        "  <channel>\n";
+            "  <channel>\n";
     if (cgi)
     {
         cout << "    <atom:link href=\"" + selfurl
-            + "\" rel=\"self\" type=\"application/rss+xml\"/>\n";
+                    + "\" rel=\"self\" type=\"application/rss+xml\"/>\n";
     }
 
     write_line(4, "title", get_project(url) + " " + type);

tests/CMakeLists.txt

@@ -9,7 +9,7 @@ target_include_directories(${PROJECT_NAME}_testlib
   "$<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/src>")
 
 target_link_libraries(${PROJECT_NAME}_testlib
-  PRIVATE Poco::Foundation Poco::Net Poco::NetSSL PkgConfig::jsoncpp)
+  PRIVATE CURL::libcurl PkgConfig::jsoncpp)
 
 file(GLOB sources_tests test_*.cpp)