84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
package psa
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import (
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"context"
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"errors"
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"strings"
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"sync"
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"github.com/evcc-io/evcc/server/db/settings"
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"github.com/evcc-io/evcc/util"
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"github.com/evcc-io/evcc/util/oauth"
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"github.com/evcc-io/evcc/util/request"
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"golang.org/x/oauth2"
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)
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type Identity struct {
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oauth2.TokenSource
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mu sync.Mutex
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oc *oauth2.Config
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log *util.Logger
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subject string
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}
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// NewIdentity creates PSA identity
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func NewIdentity(log *util.Logger, brand, user string, oc *oauth2.Config, token *oauth2.Token) (oauth2.TokenSource, error) {
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// serialise instance handling
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mu.Lock()
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defer mu.Unlock()
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// reuse identity instance
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subject := "psa." + strings.ToLower(brand) + "." + strings.ToLower(user)
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if instance := getInstance(subject); instance != nil {
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return instance, nil
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}
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v := &Identity{
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log: log,
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oc: oc,
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subject: subject,
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}
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var tok oauth2.Token
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if err := settings.Json(v.subject, &tok); err == nil {
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token = &tok
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}
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if !token.Valid() {
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if tok, err := v.refreshToken(token); err == nil {
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token = tok
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}
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}
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if !token.Valid() {
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return nil, errors.New("token expired")
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}
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v.TokenSource = oauth.RefreshTokenSource(token, v.refreshToken)
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// add instance
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addInstance(v.subject, v)
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return v, nil
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}
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func (v *Identity) refreshToken(token *oauth2.Token) (*oauth2.Token, error) {
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v.mu.Lock()
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defer v.mu.Unlock()
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client := request.NewClient(v.log)
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ctx := context.WithValue(context.Background(), oauth2.HTTPClient, client)
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tok, err := v.oc.TokenSource(ctx, token).Token()
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if err != nil {
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if strings.Contains(err.Error(), "invalid_grant") {
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settings.Delete(v.subject)
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}
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return nil, err
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}
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v.TokenSource = oauth.RefreshTokenSource(tok, v.refreshToken)
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err = settings.SetJson(v.subject, tok)
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return tok, err
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}
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