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driver.go
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driver.go
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// Copyright (c) 2017-2018 Snowflake Computing Inc. All right reserved.
package gosnowflake
import (
"database/sql"
"database/sql/driver"
"net/http"
"strings"
)
// SnowflakeDriver is a context of Go Driver
type SnowflakeDriver struct{}
// Open creates a new connection.
func (d SnowflakeDriver) Open(dsn string) (driver.Conn, error) {
glog.V(2).Info("Open")
var err error
sc := &snowflakeConn{
SequeceCounter: 0,
}
sc.cfg, err = ParseDSN(dsn)
if err != nil {
sc.cleanup()
return nil, err
}
st := SnowflakeTransport
if sc.cfg.InsecureMode {
// no revocation check with OCSP. Think twice when you want to enable this option.
st = snowflakeInsecureTransport
}
if err != nil {
return nil, err
}
// authenticate
sc.rest = &snowflakeRestful{
Host: sc.cfg.Host,
Port: sc.cfg.Port,
Protocol: sc.cfg.Protocol,
Client: &http.Client{
// request timeout including reading response body
Timeout: defaultClientTimeout,
Transport: st,
},
Authenticator: sc.cfg.Authenticator,
LoginTimeout: sc.cfg.LoginTimeout,
RequestTimeout: sc.cfg.RequestTimeout,
FuncPost: postRestful,
FuncGet: getRestful,
FuncPostQuery: postRestfulQuery,
FuncPostQueryHelper: postRestfulQueryHelper,
FuncRenewSession: renewRestfulSession,
FuncPostAuth: postAuth,
FuncCloseSession: closeSession,
FuncCancelQuery: cancelQuery,
FuncPostAuthSAML: postAuthSAML,
FuncPostAuthOKTA: postAuthOKTA,
FuncGetSSO: getSSO,
}
var authData *authResponseMain
var samlResponse []byte
var proofKey []byte
authenticator := strings.ToUpper(sc.cfg.Authenticator)
glog.V(2).Infof("Authenticating via %v", authenticator)
switch authenticator {
case authenticatorExternalBrowser:
samlResponse, proofKey, err = authenticateByExternalBrowser(
sc.rest,
sc.cfg.Authenticator,
sc.cfg.Application,
sc.cfg.Account,
sc.cfg.User,
sc.cfg.Password)
if err != nil {
sc.cleanup()
return nil, err
}
case authenticatorOAuth:
case authenticatorSnowflake:
case authenticatorJWT:
// Nothing to do, parameters needed for auth should be already set in sc.cfg
break
default:
// this is actually okta, which is something misleading
samlResponse, err = authenticateBySAML(
sc.rest,
sc.cfg.Authenticator,
sc.cfg.Application,
sc.cfg.Account,
sc.cfg.User,
sc.cfg.Password)
if err != nil {
sc.cleanup()
return nil, err
}
}
authData, err = authenticate(
sc,
samlResponse,
proofKey)
if err != nil {
sc.cleanup()
return nil, err
}
err = d.validateDefaultParameters(authData.SessionInfo.DatabaseName, &sc.cfg.Database)
if err != nil {
return nil, err
}
err = d.validateDefaultParameters(authData.SessionInfo.SchemaName, &sc.cfg.Schema)
if err != nil {
return nil, err
}
err = d.validateDefaultParameters(authData.SessionInfo.WarehouseName, &sc.cfg.Warehouse)
if err != nil {
return nil, err
}
err = d.validateDefaultParameters(authData.SessionInfo.RoleName, &sc.cfg.Role)
if err != nil {
return nil, err
}
sc.populateSessionParameters(authData.Parameters)
sc.startHeartBeat()
return sc, nil
}
func (d SnowflakeDriver) validateDefaultParameters(sessionValue string, defaultValue *string) error {
if *defaultValue != "" && strings.ToLower(*defaultValue) != strings.ToLower(sessionValue) {
return &SnowflakeError{
Number: ErrCodeObjectNotExists,
SQLState: SQLStateConnectionFailure,
Message: errMsgObjectNotExists,
MessageArgs: []interface{}{*defaultValue},
}
}
*defaultValue = sessionValue
return nil
}
func init() {
sql.Register("snowflake", &SnowflakeDriver{})
}