cpl_http.h File Reference

#include "cpl_conv.h"
#include "cpl_string.h"
#include "cpl_vsi.h"

Go to the source code of this file.

Classes

struct  CPLMimePart
struct  CPLHTTPResult

Functions

int CPL_DLL CPLHTTPEnabled (void)
 Return if CPLHTTP services can be usefull.
CPLHTTPResult CPL_DLL * CPLHTTPFetch (const char *pszURL, char **papszOptions)
 Fetch a document from an url and return in a string.
void CPL_DLL CPLHTTPCleanup (void)
 Cleanup function to call at application termination.
void CPL_DLL CPLHTTPDestroyResult (CPLHTTPResult *psResult)
 Clean the memory associated with the return value of CPLHTTPFetch().
int CPL_DLL CPLHTTPParseMultipartMime (CPLHTTPResult *psResult)
 Parses a a MIME multipart message.
char CPL_DLL * GOA2GetAuthorizationURL (const char *pszScope)
char CPL_DLL * GOA2GetRefreshToken (const char *pszAuthToken, const char *pszScope)
char CPL_DLL * GOA2GetAccessToken (const char *pszRefreshToken, const char *pszScope)

Detailed Description

Interface for downloading HTTP, FTP documents


Function Documentation

void CPL_DLL CPLHTTPDestroyResult ( CPLHTTPResult psResult  ) 

Clean the memory associated with the return value of CPLHTTPFetch().

Parameters:
psResult pointer to the return value of CPLHTTPFetch()
int CPL_DLL CPLHTTPEnabled ( void   ) 

Return if CPLHTTP services can be usefull.

Those services depend on GDAL being build with libcurl support.

Returns:
TRUE if libcurl support is enabled
CPLHTTPResult CPL_DLL* CPLHTTPFetch ( const char *  pszURL,
char **  papszOptions 
)

Fetch a document from an url and return in a string.

Parameters:
pszURL valid URL recognized by underlying download library (libcurl)
papszOptions option list as a NULL-terminated array of strings. May be NULL. The following options are handled :

  • TIMEOUT=val, where val is in seconds
  • HEADERS=val, where val is an extra header to use when getting a web page. For example "Accept: application/x-ogcwkt"
  • HTTPAUTH=[BASIC/NTLM/GSSNEGOTIATE/ANY] to specify an authentication scheme to use.
  • USERPWD=userid:password to specify a user and password for authentication
  • POSTFIELDS=val, where val is a nul-terminated string to be passed to the server with a POST request.
  • PROXY=val, to make requests go through a proxy server, where val is of the form proxy.server.com:port_number
  • PROXYUSERPWD=val, where val is of the form username:password
  • PROXYAUTH=[BASIC/NTLM/DIGEST/ANY] to specify an proxy authentication scheme to use.
  • CUSTOMREQUEST=val, where val is GET, PUT, POST, DELETE, etc.. (GDAL >= 1.9.0)

Alternatively, if not defined in the papszOptions arguments, the PROXY, PROXYUSERPWD and PROXYAUTH values are searched in the configuration options named GDAL_HTTP_PROXY, GDAL_HTTP_PROXYUSERPWD and GDAL_PROXY_AUTH, as proxy configuration belongs to networking setup and makes more sense at the configuration option level than at the connection level.

Returns:
a CPLHTTPResult* structure that must be freed by CPLHTTPDestroyResult(), or NULL if libcurl support is disabled
int CPL_DLL CPLHTTPParseMultipartMime ( CPLHTTPResult psResult  ) 

Parses a a MIME multipart message.

This function will iterate over each part and put it in a separate element of the pasMimePart array of the provided psResult structure.

Parameters:
psResult pointer to the return value of CPLHTTPFetch()
Returns:
TRUE if the message contains MIME multipart message.
char CPL_DLL* GOA2GetAccessToken ( const char *  pszRefreshToken,
const char *  pszScope 
)

Fetch access token using refresh token.

The permanent refresh token is used to fetch a temporary (usually one hour) access token using Google OAuth2 web services.

A CPLError will be reported if the request fails for some reason. Common reasons include the refresh token having been revoked by the user or http connection problems.

Parameters:
pszRefreshToken the refresh token from GOA2GetRefreshToken().
pszScope the scope for which it is valid.
Returns:
access token, to be freed with CPLFree(), null on failure.
char CPL_DLL* GOA2GetAuthorizationURL ( const char *  pszScope  ) 

Return authorization url for a given scope.

Returns the URL that a user should visit, and use for authentication in order to get an "auth token" indicating their willingness to use a service.

Note that when the user visits this url they will be asked to login (using a google/gmail/etc) account, and to authorize use of the requested scope for the application "GDAL/OGR". Once they have done so, they will be presented with a lengthy string they should "enter into their application". This is the "auth token" to be passed to GOA2GetRefreshToken(). The "auth token" can only be used once.

This function should never fail.

Parameters:
pszScope the service being requested, not yet URL encoded, such as "https://www.googleapis.com/auth/fusiontables".
Returns:
the URL to visit - should be freed with CPLFree().
char CPL_DLL* GOA2GetRefreshToken ( const char *  pszAuthToken,
const char *  pszScope 
)

Turn Auth Token into a Refresh Token.

A one time "auth token" provided by the user is turned into a reusable "refresh token" using a google oauth2 web service.

A CPLError will be reported if the translation fails for some reason. Common reasons include the auth token already having been used before, it not being appropriate for the passed scope and configured client api or http connection problems. NULL is returned on error.

Parameters:
pszAuthToken the authorization token from the user.
pszScope the scope for which it is valid.
Returns:
refresh token, to be freed with CPLFree(), null on failure.

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