Add JSON API.

src/generators/CMakeLists.txt

@@ -11,3 +11,9 @@ target_link_libraries(${PROJECT_NAME}-gen_rss
   PRIVATE fediblock pugixml)
 install(TARGETS ${PROJECT_NAME}-gen_rss
   RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
+
+add_executable(${PROJECT_NAME}-json_api "json_api.cpp")
+target_link_libraries(${PROJECT_NAME}-json_api
+  PRIVATE fediblock)
+install(TARGETS ${PROJECT_NAME}-json_api
+  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")

src/generators/json_api.cpp

@@ -0,0 +1,99 @@
+/*  This file is part of FediBlock-backend.
+ *  Copyright © 2021 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 "json_api.hpp"
+
+#include "files.hpp"
+#include "git.hpp"
+#include "types.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <cstdlib>
+#include <exception>
+#include <iostream>
+#include <ostream>
+#include <stdexcept>
+#include <vector>
+
+namespace FediBlock::json_api
+{
+
+using std::cerr;
+using std::cout;
+using std::exception;
+using std::ifstream;
+using std::ostream;
+using std::runtime_error;
+using std::stringstream;
+using std::vector;
+
+void write_json(ostream &out, const vector<entry_type> &entries)
+{
+    nlohmann::json json;
+
+    for (const auto &entry : entries)
+    {
+        size_t startpos{0};
+        size_t endpos{0};
+        do
+        {
+            endpos = entry.instance.find(',', startpos);
+            string instance{entry.instance.substr(startpos, endpos - startpos)};
+
+            json.push_back({{"instance", instance}, {"url", entry.json_url}});
+
+            startpos = endpos + 1;
+        } while (endpos != string::npos);
+    }
+
+    out << json.dump() << '\n';
+}
+
+} // namespace FediBlock::json_api
+
+int main(int /*argc*/, char * /*argv*/[])
+{
+    using namespace FediBlock;
+    using namespace FediBlock::json_api;
+
+    git::init(true);
+
+    bool remove_lockfile{false};
+    try
+    {
+        try
+        {
+            git::update_cached_repo();
+            remove_lockfile = true;
+        }
+        catch (const runtime_error &e)
+        {
+            cerr << "Warning: " << e.what() << '\n';
+            // Ignore, use old version of repo.
+        }
+        const auto entries{files::read_json_files(true)};
+        write_json(cout, entries);
+    }
+    catch (const exception &e)
+    {
+        cerr << "Error: " << e.what() << '\n';
+    }
+
+    git::cleanup(remove_lockfile);
+
+    return 0;
+}

src/generators/json_api.hpp

@@ -0,0 +1,36 @@
+/*  This file is part of FediBlock-backend.
+ *  Copyright © 2021 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 FEDIBLOCK_BACKEND_JSON_API_HPP
+#define FEDIBLOCK_BACKEND_JSON_API_HPP
+
+#include "types.hpp"
+
+#include <ostream>
+#include <vector>
+
+namespace FediBlock::json_api
+{
+
+using std::ostream;
+using std::vector;
+
+// Output JSON to an ostream.
+void write_json(ostream &out, const vector<entry_type> &entries);
+
+} // namespace FediBlock::json_api
+
+#endif // FEDIBLOCK_BACKEND_JSON_API_HPP