128 lines
2.8 KiB
Go
128 lines
2.8 KiB
Go
package vag
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import (
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"net/url"
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"sync"
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"time"
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"dario.cat/mergo"
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"golang.org/x/oauth2"
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)
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// TokenSource is a VAG token source compatible with oauth2.TokenSource
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type TokenSource interface {
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// Token returns an OAuth2 compatible token (id_token omitted)
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Token() (*oauth2.Token, error)
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// TokenEx returns the extended VAG token (id_token included)
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TokenEx() (*Token, error)
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}
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// TokenExchanger exchanges a VW identity response into a (refreshing) VAG token source
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type TokenExchanger interface {
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Exchange(q url.Values) (*Token, error)
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TokenSource(token *Token) TokenSource
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}
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// TokenRefresher refreshes a token
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type TokenRefresher func(*Token) (*Token, error)
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var _ TokenSource = (*tokenSource)(nil)
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type tokenSource struct {
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mu sync.Mutex
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token *Token
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new TokenRefresher
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}
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func RefreshTokenSource(token *Token, refresher TokenRefresher) *tokenSource {
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return &tokenSource{token: token, new: refresher}
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}
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// Token returns an oauth2 token or an error
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func (ts *tokenSource) Token() (*oauth2.Token, error) {
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token, err := ts.TokenEx()
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if err != nil {
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return nil, err
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}
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return &token.Token, err
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}
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func (ts *tokenSource) TokenEx() (*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 time.Until(ts.token.Expiry) < time.Minute {
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var token *Token
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if token, err = ts.new(ts.token); err == nil {
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err = ts.mergeToken(token)
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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 *Token) error {
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return mergo.Merge(ts.token, t, mergo.WithOverride)
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}
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type metaTokenSource struct {
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mu sync.Mutex
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ts TokenSource
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newT func() (*Token, error)
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newTS func(*Token) TokenSource
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}
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// MetaTokenSource creates a token source that is created using the
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// `newTS` function or recreated once it fails to return tokens.
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// The recreation uses a new bootstrap token provided by the `newT` function.
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func MetaTokenSource(newT func() (*Token, error), newTS func(*Token) TokenSource) *metaTokenSource {
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return &metaTokenSource{
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newT: newT,
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newTS: newTS,
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}
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}
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// Token returns an oauth2 token or an error
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func (ts *metaTokenSource) Token() (*oauth2.Token, error) {
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token, err := ts.TokenEx()
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if err != nil {
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return nil, err
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}
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return &token.Token, err
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}
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// Token returns a vag token or an error
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func (ts *metaTokenSource) TokenEx() (*Token, error) {
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ts.mu.Lock()
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defer ts.mu.Unlock()
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// use token source
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if ts.ts != nil {
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token, err := ts.ts.TokenEx()
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if err == nil {
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return token, nil
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}
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}
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// create new start token
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token, err := ts.newT()
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if err != nil {
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return nil, err
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}
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// create token source
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ts.ts = ts.newTS(token)
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// use token source
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token, err = ts.ts.TokenEx()
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if err != nil {
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// token source doesn't work anymore, reset it
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ts.ts = nil
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}
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return token, err
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}
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