cpl_aws.h

/**********************************************************************
 * $Id$
 *
 * Name:     cpl_aws.h
 * Project:  CPL - Common Portability Library
 * Purpose:  Amazon Web Services routines
 * Author:   Even Rouault <even.rouault at spatialys.com>
 *
 **********************************************************************
 * Copyright (c) 2015, Even Rouault <even.rouault at spatialys.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/
 
#ifndef CPL_AWS_INCLUDED_H
#define CPL_AWS_INCLUDED_H
 
#ifndef DOXYGEN_SKIP
 
#ifdef HAVE_CURL
 
#include <cstddef>
 
#include "cpl_string.h"
 
#include <curl/curl.h>
#include <map>
 
CPLString CPLGetLowerCaseHexSHA256( const void *pabyData, size_t nBytes );
CPLString CPLGetLowerCaseHexSHA256( const CPLString& osStr );
 
CPLString CPLGetAWS_SIGN4_Timestamp();
 
CPLString CPLAWSURLEncode(const CPLString& osURL, bool bEncodeSlash = true);
 
CPLString CPLAWSGetHeaderVal(const struct curl_slist* psExistingHeaders,
                             const char* pszKey);
 
CPLString
CPLGetAWS_SIGN4_Signature( const CPLString& osSecretAccessKey,
                               const CPLString& osAccessToken,
                               const CPLString& osRegion,
                               const CPLString& osRequestPayer,
                               const CPLString& osService,
                               const CPLString& osVerb,
                               const struct curl_slist* psExistingHeaders,
                               const CPLString& osHost,
                               const CPLString& osCanonicalURI,
                               const CPLString& osCanonicalQueryString,
                               const CPLString& osXAMZContentSHA256,
                               const CPLString& osTimestamp,
                               CPLString& osSignedHeaders );
 
CPLString CPLGetAWS_SIGN4_Authorization(const CPLString& osSecretAccessKey,
                                        const CPLString& osAccessKeyId,
                                        const CPLString& osAccessToken,
                                        const CPLString& osRegion,
                                        const CPLString& osRequestPayer,
                                        const CPLString& osService,
                                        const CPLString& osVerb,
                                        const struct curl_slist* psExistingHeaders,
                                        const CPLString& osHost,
                                        const CPLString& osCanonicalURI,
                                        const CPLString& osCanonicalQueryString,
                                        const CPLString& osXAMZContentSHA256,
                                        const CPLString& osTimestamp);
 
class IVSIS3LikeHandleHelper
{
protected:
        std::map<CPLString, CPLString> m_oMapQueryParameters;
 
        virtual void RebuildURL() = 0;
        CPLString GetQueryString(bool bAddEmptyValueAfterEqual) const;
 
public:
        IVSIS3LikeHandleHelper() {}
        virtual ~IVSIS3LikeHandleHelper() {}
 
        void ResetQueryParameters();
        void AddQueryParameter(const CPLString& osKey, const CPLString& osValue);
 
        virtual struct curl_slist* GetCurlHeaders(const CPLString& osVerb,
                                          const struct curl_slist* psExistingHeaders,
                                          const void *pabyDataContent = nullptr,
                                          size_t nBytesContent = 0) const = 0;
 
        virtual bool AllowAutomaticRedirection() { return true; }
        virtual bool CanRestartOnError(const char*, const char* /* pszHeaders*/,
                                       bool /*bSetError*/, bool* /*pbUpdateMap*/ = nullptr) { return false;}
 
        virtual const CPLString& GetURL() const = 0;
 
        static bool GetBucketAndObjectKey(const char* pszURI,
                                          const char* pszFSPrefix,
                                          bool bAllowNoObject,
                                          CPLString &osBucketOut,
                                          CPLString &osObjectKeyOut);
 
        static CPLString BuildCanonicalizedHeaders(
                            std::map<CPLString, CPLString>& oSortedMapHeaders,
                            const struct curl_slist* psExistingHeaders,
                            const char* pszHeaderPrefix);
 
        static CPLString GetRFC822DateTime();
};
 
class VSIS3HandleHelper final: public IVSIS3LikeHandleHelper
{
        CPLString m_osURL;
        CPLString m_osSecretAccessKey;
        CPLString m_osAccessKeyId;
        CPLString m_osSessionToken;
        CPLString m_osEndpoint;
        CPLString m_osRegion;
        CPLString m_osRequestPayer;
        CPLString m_osBucket;
        CPLString m_osObjectKey;
        bool m_bUseHTTPS;
        bool m_bUseVirtualHosting;
 
        void RebuildURL() override;
 
        static bool GetConfigurationFromEC2(CPLString& osSecretAccessKey,
                                            CPLString& osAccessKeyId,
                                            CPLString& osSessionToken);
 
        static bool GetConfigurationFromAWSConfigFiles(
                                     CPLString& osSecretAccessKey,
                                     CPLString& osAccessKeyId,
                                     CPLString& osSessionToken,
                                     CPLString& osRegion,
                                     CPLString& osCredentials);
 
        static bool GetConfiguration(CSLConstList papszOptions,
                                     CPLString& osSecretAccessKey,
                                     CPLString& osAccessKeyId,
                                     CPLString& osSessionToken,
                                     CPLString& osRegion);
  protected:
 
    public:
        VSIS3HandleHelper(const CPLString& osSecretAccessKey,
                    const CPLString& osAccessKeyId,
                    const CPLString& osSessionToken,
                    const CPLString& osEndpoint,
                    const CPLString& osRegion,
                    const CPLString& osRequestPayer,
                    const CPLString& osBucket,
                    const CPLString& osObjectKey,
                    bool bUseHTTPS, bool bUseVirtualHosting);
       ~VSIS3HandleHelper();
 
        static VSIS3HandleHelper* BuildFromURI(const char* pszURI,
                                               const char* pszFSPrefix,
                                               bool bAllowNoObject,
                                               CSLConstList papszOptions = nullptr);
        static CPLString BuildURL(const CPLString& osEndpoint,
                                  const CPLString& osBucket,
                                  const CPLString& osObjectKey,
                                  bool bUseHTTPS, bool bUseVirtualHosting);
 
        struct curl_slist* GetCurlHeaders(
            const CPLString& osVerb,
            const struct curl_slist* psExistingHeaders,
            const void *pabyDataContent = nullptr,
            size_t nBytesContent = 0) const override;
 
        bool AllowAutomaticRedirection() override { return false; }
        bool CanRestartOnError(const char*, const char* pszHeaders,
                               bool bSetError,
                               bool* pbUpdateMap = nullptr) override;
 
        const CPLString& GetURL() const override { return m_osURL; }
        const CPLString& GetBucket() const { return m_osBucket; }
        const CPLString& GetObjectKey() const { return m_osObjectKey; }
        const CPLString& GetEndpoint()const  { return m_osEndpoint; }
        const CPLString& GetRegion() const { return m_osRegion; }
        const CPLString& GetRequestPayer() const { return m_osRequestPayer; }
        bool GetVirtualHosting() const { return m_bUseVirtualHosting; }
        void SetEndpoint(const CPLString &osStr);
        void SetRegion(const CPLString &osStr);
        void SetRequestPayer(const CPLString &osStr);
        void SetVirtualHosting(bool b);
 
        CPLString GetSignedURL(CSLConstList papszOptions);
 
        static void CleanMutex();
        static void ClearCache();
};
 
class VSIS3UpdateParams
{
    public:
        CPLString m_osRegion;
        CPLString m_osEndpoint;
        CPLString m_osRequestPayer;
        bool m_bUseVirtualHosting;
 
        VSIS3UpdateParams() :
            m_bUseVirtualHosting(false) {}
 
        explicit VSIS3UpdateParams(const VSIS3HandleHelper* poHelper) :
            m_osRegion(poHelper->GetRegion()),
            m_osEndpoint(poHelper->GetEndpoint()),
            m_osRequestPayer(poHelper->GetRequestPayer()),
            m_bUseVirtualHosting(poHelper->GetVirtualHosting()) {}
 
        void UpdateHandlerHelper(VSIS3HandleHelper* poHelper) {
            poHelper->SetRegion(m_osRegion);
            poHelper->SetEndpoint(m_osEndpoint);
            poHelper->SetRequestPayer(m_osRequestPayer);
            poHelper->SetVirtualHosting(m_bUseVirtualHosting);
        }
};
 
#endif /* HAVE_CURL */
 
#endif /* #ifndef DOXYGEN_SKIP */
 
#endif /* CPL_AWS_INCLUDED_H */