diff options
Diffstat (limited to 'src/lib/utils/http_util/http_util.cpp')
| -rw-r--r-- | src/lib/utils/http_util/http_util.cpp | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/lib/utils/http_util/http_util.cpp b/src/lib/utils/http_util/http_util.cpp new file mode 100644 index 000000000..a233c1c60 --- /dev/null +++ b/src/lib/utils/http_util/http_util.cpp @@ -0,0 +1,220 @@ +/* +* Sketchy HTTP client +* (C) 2013 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/http_util.h> +#include <botan/parsing.h> +#include <botan/hex.h> +#include <sstream> + +#if defined(BOTAN_HAS_BOOST_ASIO) +#include <boost/asio.hpp> +#endif + +namespace Botan { + +namespace HTTP { + +#if defined(BOTAN_HAS_BOOST_ASIO) +std::string http_transact_asio(const std::string& hostname, + const std::string& message) + { + using namespace boost::asio::ip; + + boost::asio::ip::tcp::iostream tcp; + + tcp.connect(hostname, "http"); + + if(!tcp) + throw std::runtime_error("HTTP connection to " + hostname + " failed"); + + tcp << message; + tcp.flush(); + + std::ostringstream oss; + oss << tcp.rdbuf(); + + return oss.str(); + } +#endif + +std::string http_transact_fail(const std::string& hostname, + const std::string&) + { + throw std::runtime_error("Cannot connect to " + hostname + + ": network code disabled in build"); + } + +std::string url_encode(const std::string& in) + { + std::ostringstream out; + + for(auto c : in) + { + if(c >= 'A' && c <= 'Z') + out << c; + else if(c >= 'a' && c <= 'z') + out << c; + else if(c >= '0' && c <= '9') + out << c; + else if(c == '-' || c == '_' || c == '.' || c == '~') + out << c; + else + out << '%' << hex_encode(reinterpret_cast<byte*>(&c), 1); + } + + return out.str(); + } + +std::ostream& operator<<(std::ostream& o, const Response& resp) + { + o << "HTTP " << resp.status_code() << " " << resp.status_message() << "\n"; + for(auto h : resp.headers()) + o << "Header '" << h.first << "' = '" << h.second << "'\n"; + o << "Body " << std::to_string(resp.body().size()) << " bytes:\n"; + o.write(reinterpret_cast<const char*>(&resp.body()[0]), resp.body().size()); + return o; + } + +Response http_sync(http_exch_fn http_transact, + const std::string& verb, + const std::string& url, + const std::string& content_type, + const std::vector<byte>& body, + size_t allowable_redirects) + { + const auto protocol_host_sep = url.find("://"); + if(protocol_host_sep == std::string::npos) + throw std::runtime_error("Invalid URL " + url); + const std::string protocol = url.substr(0, protocol_host_sep); + + const auto host_loc_sep = url.find('/', protocol_host_sep + 3); + + std::string hostname, loc; + + if(host_loc_sep == std::string::npos) + { + hostname = url.substr(protocol_host_sep + 3, std::string::npos); + loc = "/"; + } + else + { + hostname = url.substr(protocol_host_sep + 3, host_loc_sep-protocol_host_sep-3); + loc = url.substr(host_loc_sep, std::string::npos); + } + + std::ostringstream outbuf; + + outbuf << verb << " " << loc << " HTTP/1.0\r\n"; + outbuf << "Host: " << hostname << "\r\n"; + + if(verb == "GET") + { + outbuf << "Accept: */*\r\n"; + outbuf << "Cache-Control: no-cache\r\n"; + } + else if(verb == "POST") + outbuf << "Content-Length: " << body.size() << "\r\n"; + + if(content_type != "") + outbuf << "Content-Type: " << content_type << "\r\n"; + outbuf << "Connection: close\r\n\r\n"; + outbuf.write(reinterpret_cast<const char*>(&body[0]), body.size()); + + std::istringstream io(http_transact(hostname, outbuf.str())); + + std::string line1; + std::getline(io, line1); + if(!io || line1.empty()) + throw std::runtime_error("No response"); + + std::stringstream response_stream(line1); + std::string http_version; + unsigned int status_code; + std::string status_message; + + response_stream >> http_version >> status_code; + + std::getline(response_stream, status_message); + + if(!response_stream || http_version.substr(0,5) != "HTTP/") + throw std::runtime_error("Not an HTTP response"); + + std::map<std::string, std::string> headers; + std::string header_line; + while (std::getline(io, header_line) && header_line != "\r") + { + auto sep = header_line.find(": "); + if(sep == std::string::npos || sep > header_line.size() - 2) + throw std::runtime_error("Invalid HTTP header " + header_line); + const std::string key = header_line.substr(0, sep); + + if(sep + 2 < header_line.size() - 1) + { + const std::string val = header_line.substr(sep + 2, (header_line.size() - 1) - (sep + 2)); + headers[key] = val; + } + } + + if(status_code == 301 && headers.count("Location")) + { + if(allowable_redirects == 0) + throw std::runtime_error("HTTP redirection count exceeded"); + return GET_sync(headers["Location"], allowable_redirects - 1); + } + + // Use Content-Length if set + std::vector<byte> resp_body; + std::vector<byte> buf(4096); + while(io.good()) + { + io.read(reinterpret_cast<char*>(&buf[0]), buf.size()); + resp_body.insert(resp_body.end(), &buf[0], &buf[io.gcount()]); + } + + return Response(status_code, status_message, resp_body, headers); + } + +Response http_sync(const std::string& verb, + const std::string& url, + const std::string& content_type, + const std::vector<byte>& body, + size_t allowable_redirects) + { + return http_sync( +#if defined(BOTAN_HAS_BOOST_ASIO) + http_transact_asio, +#else + http_transact_fail, +#endif + verb, + url, + content_type, + body, + allowable_redirects); + } + +Response GET_sync(const std::string& url, size_t allowable_redirects) + { + return http_sync("GET", url, "", std::vector<byte>(), allowable_redirects); + } + +Response POST_sync(const std::string& url, + const std::string& content_type, + const std::vector<byte>& body, + size_t allowable_redirects) + { + return http_sync("POST", url, content_type, body, allowable_redirects); + } + +std::future<Response> GET_async(const std::string& url, size_t allowable_redirects) + { + return std::async(std::launch::async, GET_sync, url, allowable_redirects); + } + +} + +} |