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51 lines
1.3 KiB
51 lines
1.3 KiB
// +build go1.10
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package mssql
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import (
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"context"
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"database/sql/driver"
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"errors"
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"fmt"
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)
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var _ driver.Connector = &accessTokenConnector{}
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// accessTokenConnector wraps Connector and injects a
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// fresh access token when connecting to the database
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type accessTokenConnector struct {
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Connector
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accessTokenProvider func() (string, error)
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}
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// NewAccessTokenConnector creates a new connector from a DSN and a token provider.
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// The token provider func will be called when a new connection is requested and should return a valid access token.
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// The returned connector may be used with sql.OpenDB.
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func NewAccessTokenConnector(dsn string, tokenProvider func() (string, error)) (driver.Connector, error) {
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if tokenProvider == nil {
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return nil, errors.New("mssql: tokenProvider cannot be nil")
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}
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conn, err := NewConnector(dsn)
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if err != nil {
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return nil, err
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}
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c := &accessTokenConnector{
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Connector: *conn,
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accessTokenProvider: tokenProvider,
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}
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return c, nil
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}
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// Connect returns a new database connection
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func (c *accessTokenConnector) Connect(ctx context.Context) (driver.Conn, error) {
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var err error
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c.Connector.params.fedAuthAccessToken, err = c.accessTokenProvider()
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if err != nil {
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return nil, fmt.Errorf("mssql: error retrieving access token: %+v", err)
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}
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return c.Connector.Connect(ctx)
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}
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