46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package oauth
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import (
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"errors"
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"sync"
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"time"
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"github.com/imdario/mergo"
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"golang.org/x/oauth2"
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)
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type TokenRefresher interface {
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RefreshToken(token *oauth2.Token) (*oauth2.Token, error)
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}
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type TokenSource struct {
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mu sync.Mutex
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token *oauth2.Token
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refresher TokenRefresher
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}
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func RefreshTokenSource(token *oauth2.Token, refresher TokenRefresher) oauth2.TokenSource {
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return &TokenSource{token: token, refresher: refresher}
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}
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func (ts *TokenSource) Token() (*oauth2.Token, error) {
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ts.mu.Lock()
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defer ts.mu.Unlock()
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var err error
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if ts.token == nil || time.Until(ts.token.Expiry) < time.Minute {
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var token *oauth2.Token
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if token, err = ts.refresher.RefreshToken(ts.token); err == nil {
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if token.AccessToken == "" {
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err = errors.New("token refresh failed to obtain access token")
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} else {
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err = ts.mergeToken(token)
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}
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}
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}
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return ts.token, err
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}
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// mergeToken updates a token while preventing wiping the refresh token
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func (ts *TokenSource) mergeToken(t *oauth2.Token) error {
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return mergo.Merge(ts.token, t, mergo.WithOverride)
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}
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