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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
Classes dealing with the abstraction of talking to a end via a text
protocol like HTTP (which is used by the http and https methods)
##################################################################### */
/*}}}*/
#ifndef APT_SERVER_H
#define APT_SERVER_H
#include "aptmethod.h"
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>
#include <ctime>
#include <iostream>
#include <memory>
#include <string>
using std::cout;
using std::endl;
class Hashes;
class BaseHttpMethod;
struct ServerState;
enum class HaveContent
{
TRI_UNKNOWN,
TRI_FALSE,
TRI_TRUE,
};
struct RequestState
{
unsigned int Major = 0;
unsigned int Minor = 0;
unsigned int Result = 0;
char Code[360];
// total size of the usable content (aka: the file)
unsigned long long TotalFileSize = 0;
// size we actually download (can be smaller than Size if we have partial content)
unsigned long long DownloadSize = 0;
// size of junk content (aka: server error pages)
unsigned long long JunkSize = 0;
// The start of the data (for partial content)
unsigned long long StartPos = 0;
unsigned long long MaximumSize = 0;
time_t Date;
HaveContent haveContent = HaveContent::TRI_UNKNOWN;
enum {Chunked,Stream,Closes} Encoding = Closes;
enum {Header, Data} State = Header;
std::string Location;
FileFd File;
BaseHttpMethod * const Owner;
ServerState * const Server;
bool HeaderLine(std::string const &Line);
bool AddPartialFileToHashes(FileFd &File);
RequestState(BaseHttpMethod * const Owner, ServerState * const Server) :
Owner(Owner), Server(Server) { time(&Date); Code[0] = '\0'; }
};
struct ServerState
{
bool Persistent;
bool PipelineAllowed;
bool RangesAllowed;
unsigned long PipelineAnswersReceived;
bool Pipeline;
URI ServerName;
URI Proxy;
unsigned long TimeOut;
protected:
BaseHttpMethod *Owner;
virtual bool ReadHeaderLines(std::string &Data) = 0;
virtual ResultState LoadNextResponse(bool const ToFile, RequestState &Req) = 0;
public:
/** \brief Result of the header acquire */
enum RunHeadersResult {
/** \brief Header ok */
RUN_HEADERS_OK,
/** \brief IO error while retrieving */
RUN_HEADERS_IO_ERROR,
/** \brief Parse error after retrieving */
RUN_HEADERS_PARSE_ERROR
};
/** \brief Get the headers before the data */
RunHeadersResult RunHeaders(RequestState &Req, const std::string &Uri);
bool Comp(URI Other) const {return Other.Access == ServerName.Access && Other.Host == ServerName.Host && Other.Port == ServerName.Port;};
virtual void Reset();
virtual bool WriteResponse(std::string const &Data) = 0;
/** \brief Transfer the data from the socket */
virtual ResultState RunData(RequestState &Req) = 0;
virtual ResultState RunDataToDevNull(RequestState &Req) = 0;
virtual ResultState Open() = 0;
virtual bool IsOpen() = 0;
virtual bool Close() = 0;
virtual bool InitHashes(HashStringList const &ExpectedHashes) = 0;
virtual ResultState Die(RequestState &Req) = 0;
virtual bool Flush(FileFd *const File, bool MustComplete = false) = 0;
virtual ResultState Go(bool ToFile, RequestState &Req) = 0;
virtual Hashes * GetHashes() = 0;
ServerState(URI Srv, BaseHttpMethod *Owner);
virtual ~ServerState() {};
};
class BaseHttpMethod : public aptAuthConfMethod
{
protected:
virtual bool Fetch(FetchItem *) APT_OVERRIDE;
std::unique_ptr<ServerState> Server;
std::string NextURI;
bool AllowRedirect;
// Find the biggest item in the fetch queue for the checking of the maximum
// size
unsigned long long FindMaximumObjectSizeInQueue() const APT_PURE;
public:
bool Debug;
unsigned long PipelineDepth;
/** \brief Result of the header parsing */
enum DealWithHeadersResult {
/** \brief The file is open and ready */
FILE_IS_OPEN,
/** \brief We got a IMS hit, the file has not changed */
IMS_HIT,
/** \brief The server reported a unrecoverable error */
ERROR_UNRECOVERABLE,
/** \brief The server reported a error with a error content page */
ERROR_WITH_CONTENT_PAGE,
/** \brief An error on the client side */
ERROR_NOT_FROM_SERVER,
/** \brief A redirect or retry request */
TRY_AGAIN_OR_REDIRECT
};
/** \brief Handle the retrieved header data */
virtual DealWithHeadersResult DealWithHeaders(FetchResult &Res, RequestState &Req);
// In the event of a fatal signal this file will be closed and timestamped.
static std::string FailFile;
static int FailFd;
static time_t FailTime;
static APT_NORETURN void SigTerm(int);
int Loop();
virtual void SendReq(FetchItem *Itm) = 0;
virtual std::unique_ptr<ServerState> CreateServerState(URI const &uri) = 0;
virtual void RotateDNS() = 0;
virtual bool Configuration(std::string Message) APT_OVERRIDE;
bool AddProxyAuth(URI &Proxy, URI const &Server);
BaseHttpMethod(std::string &&Binary, char const * const Ver,unsigned long const Flags);
virtual ~BaseHttpMethod() {};
};
#endif
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