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//====== Copyright © 1996-2009, Valve Corporation, All rights reserved. =======
//
// Purpose: interface to http client
//
//=============================================================================
#ifndef ISTEAMHTTP_H
#define ISTEAMHTTP_H
#ifdef _WIN32
#pragma once
#endif
#include "isteamclient.h"
#include "steamhttpenums.h"
// Handle to a depot build
typedef uint32 HTTPRequestHandle;
#define INVALID_HTTPREQUEST_HANDLE 0
//-----------------------------------------------------------------------------
// Purpose: interface to building depots
//-----------------------------------------------------------------------------
class ISteamHTTP
{
public:
// Initializes a new HTTP request, returning a handle to use in further operations on it. Requires
// the method (GET or POST) and the absolute URL for the request. Only http requests (ie, not https) are
// currently supported, so this string must start with http:// or https:// and should look like http://store.steampowered.com/app/250/
// or such.
virtual HTTPRequestHandle CreateHTTPRequest( EHTTPMethod eHTTPRequestMethod, const char *pchAbsoluteURL ) = 0;
// Set a context value for the request, which will be returned in the HTTPRequestCompleted_t callback after
// sending the request. This is just so the caller can easily keep track of which callbacks go with which request data.
virtual bool SetHTTPRequestContextValue( HTTPRequestHandle hRequest, uint64 ulContextValue ) = 0;
// Set a timeout in seconds for the HTTP request, must be called prior to sending the request. Default
// timeout is 60 seconds if you don't call this. Returns false if the handle is invalid, or the request
// has already been sent.
virtual bool SetHTTPRequestNetworkActivityTimeout( HTTPRequestHandle hRequest, uint32 unTimeoutSeconds ) = 0;
// Set a request header value for the request, must be called prior to sending the request. Will
// return false if the handle is invalid or the request is already sent.
virtual bool SetHTTPRequestHeaderValue( HTTPRequestHandle hRequest, const char *pchHeaderName, const char *pchHeaderValue ) = 0;
// Set a GET or POST parameter value on the request, which is set will depend on the EHTTPMethod specified
// when creating the request. Must be called prior to sending the request. Will return false if the
// handle is invalid or the request is already sent.
virtual bool SetHTTPRequestGetOrPostParameter( HTTPRequestHandle hRequest, const char *pchParamName, const char *pchParamValue ) = 0;
// Sends the HTTP request, will return false on a bad handle, otherwise use SteamCallHandle to wait on
// asyncronous response via callback.
//
// Note: If the user is in offline mode in Steam, then this will add a only-if-cached cache-control
// header and only do a local cache lookup rather than sending any actual remote request.
virtual bool SendHTTPRequest( HTTPRequestHandle hRequest, SteamAPICall_t *pCallHandle ) = 0;
// Defers a request you have sent, the actual HTTP client code may have many requests queued, and this will move
// the specified request to the tail of the queue. Returns false on invalid handle, or if the request is not yet sent.
virtual bool DeferHTTPRequest( HTTPRequestHandle hRequest ) = 0;
// Prioritizes a request you have sent, the actual HTTP client code may have many requests queued, and this will move
// the specified request to the head of the queue. Returns false on invalid handle, or if the request is not yet sent.
virtual bool PrioritizeHTTPRequest( HTTPRequestHandle hRequest ) = 0;
// Checks if a response header is present in a HTTP response given a handle from HTTPRequestCompleted_t, also
// returns the size of the header value if present so the caller and allocate a correctly sized buffer for
// GetHTTPResponseHeaderValue.
virtual bool GetHTTPResponseHeaderSize( HTTPRequestHandle hRequest, const char *pchHeaderName, uint32 *unResponseHeaderSize ) = 0;
// Gets header values from a HTTP response given a handle from HTTPRequestCompleted_t, will return false if the
// header is not present or if your buffer is too small to contain it's value. You should first call
// BGetHTTPResponseHeaderSize to check for the presence of the header and to find out the size buffer needed.
virtual bool GetHTTPResponseHeaderValue( HTTPRequestHandle hRequest, const char *pchHeaderName, uint8 *pHeaderValueBuffer, uint32 unBufferSize ) = 0;
// Gets the size of the body data from a HTTP response given a handle from HTTPRequestCompleted_t, will return false if the
// handle is invalid.
virtual bool GetHTTPResponseBodySize( HTTPRequestHandle hRequest, uint32 *unBodySize ) = 0;
// Gets the body data from a HTTP response given a handle from HTTPRequestCompleted_t, will return false if the
// handle is invalid or if the provided buffer is not the correct size. Use BGetHTTPResponseBodySize first to find out
// the correct buffer size to use.
virtual bool GetHTTPResponseBodyData( HTTPRequestHandle hRequest, uint8 *pBodyDataBuffer, uint32 unBufferSize ) = 0;
// Releases an HTTP response handle, should always be called to free resources after receiving a HTTPRequestCompleted_t
// callback and finishing using the response.
virtual bool ReleaseHTTPRequest( HTTPRequestHandle hRequest ) = 0;
// Gets progress on downloading the body for the request. This will be zero unless a response header has already been
// received which included a content-length field. For responses that contain no content-length it will report
// zero for the duration of the request as the size is unknown until the connection closes.
virtual bool GetHTTPDownloadProgressPct( HTTPRequestHandle hRequest, float *pflPercentOut ) = 0;
};
#define STEAMHTTP_INTERFACE_VERSION "STEAMHTTP_INTERFACE_VERSION001"
struct HTTPRequestCompleted_t
{
enum { k_iCallback = k_iClientHTTPCallbacks + 1 };
// Handle value for the request that has completed.
HTTPRequestHandle m_hRequest;
// Context value that the user defined on the request that this callback is associated with, 0 if
// no context value was set.
uint64 m_ulContextValue;
// This will be true if we actually got any sort of response from the server (even an error).
// It will be false if we failed due to an internal error or client side network failure.
bool m_bRequestSuccessful;
// Will be the HTTP status code value returned by the server, k_EHTTPStatusCode200OK is the normal
// OK response, if you get something else you probably need to treat it as a failure.
EHTTPStatusCode m_eStatusCode;
};
#endif // ISTEAMHTTP_H
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