[技术博客]阿里云签名机制字符串的C语言实现

问题描述见：阿里云

话不多说，上字符串函数转化函数代码

bool AlicloudRequest::sendV2Request() {    if( query_parameters.find( "Action" ) == query_parameters.end() ) {        this->errorCode = "E_INTERNAL";        this->errorMessage = "No action specified in request.";        dprintf( D_ALWAYS, "No action specified in request, failing.\n" );        return false;    }    std::string protocol, host, httpRequestURI;    if(! parseURL( serviceURL, protocol, host, httpRequestURI )) {        this->errorCode = "E_INVALID_SERVICE_URL";        this->errorMessage = "Failed to parse service URL.";        dprintf( D_ALWAYS, "Failed to match regex against service URL '%s'.\n", serviceURL.c_str() );        return false;    }    if( (protocol != "http" && protocol != "https" && protocol != "x509" && protocol != "euca3" && protocol != "euca3s" ) ) {        this->errorCode = "E_INVALID_SERVICE_URL";        this->errorMessage = "Service URL not of a known protocol (http[s]|x509|euca3[s]).";        dprintf( D_ALWAYS, "Service URL '%s' not of a known protocol (http[s]|x509|euca3[s]).\n", serviceURL.c_str() );        return false;    }    std::string hostAndPath = host + httpRequestURI;    std::transform( host.begin(), host.end(), host.begin(), & tolower );    if( httpRequestURI.empty() ) { httpRequestURI = "/"; }    if( protocol == "euca3" || protocol == "euca3s" ) {        query_parameters.erase( "InstanceInitiatedShutdownBehavior" );    }    std::string keyID;    if( protocol != "x509" ) {        if( ! readShortFile( this->accessKeyFile, keyID ) ) {            this->errorCode = "E_FILE_IO";            this->errorMessage = "Unable to read from accesskey file '" + this->accessKeyFile + "'.";            dprintf( D_ALWAYS, "Unable to read accesskey file '%s', failing.\n", this->accessKeyFile.c_str() );            return false;        }        trim( keyID );        query_parameters.insert( std::make_pair( "AccessKeyId", keyID ) );    }    std::stringstream ss;    ss<
    
     secretKeyFile, saKey ) ) {            this->errorCode = "E_FILE_IO";            this->errorMessage = "Unable to read from secretkey file '" + this->secretKeyFile + "'.";            dprintf( D_ALWAYS, "Unable to read secretkey file '%s', failing.\n", this->secretKeyFile.c_str() );            return false;        }        trim( saKey );    }    unsigned int mdLength = 0;    unsigned char messageDigest[EVP_MAX_MD_SIZE];        const unsigned char * hmac = HMAC( EVP_sha1(), saKey.c_str(), saKey.length(),        (const unsigned char *)stringToSign.c_str(), stringToSign.length(), messageDigest, & mdLength );    if( hmac == NULL ) {        this->errorCode = "E_INTERNAL";        this->errorMessage = "Unable to calculate query signature (SHA1 HMAC).";        dprintf( D_ALWAYS, "Unable to calculate SHA1 HMAC to sign query, failing.\n" );        return false;    }    char * base64Encoded = condor_base64_encode( messageDigest, mdLength );    std::string signatureInBase64 = base64Encoded;    free( base64Encoded );    std::string postURI;    if( protocol == "x509" ) {        postURI = "https://" + hostAndPath;    } else if( protocol == "euca3" ) {        postURI = "http://" + hostAndPath;    } else if( protocol == "euca3s" ) {        postURI = "https://" + hostAndPath;    } else {        postURI = this->serviceURL;    }    dprintf( D_FULLDEBUG, "Request URI is '%s'\n", postURI.c_str() );       size_t index = canonicalQueryString.find( "AccessKeyId=" );    if( index != std::string::npos ) {        size_t skipLast = canonicalQueryString.find( "&", index + 14 );        char swap = canonicalQueryString[ index + 15 ];        canonicalQueryString[ index + 15 ] = '\0';        char const * cqs = canonicalQueryString.c_str();        if( skipLast == std::string::npos ) {            dprintf( D_FULLDEBUG, "Post body is '%s...'\n", cqs );        } else {            dprintf( D_FULLDEBUG, "Post body is '%s...%s'\n", cqs, cqs + skipLast );        }        canonicalQueryString[ index + 15 ] = swap;    } else {        dprintf( D_FULLDEBUG, "Post body is '%s'\n", canonicalQueryString.c_str() );    }    return sendPreparedRequest( protocol, postURI, canonicalQueryString );}