8 changed files with 131 additions and 2 deletions
@ -0,0 +1,102 @@ |
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package auth |
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import ( |
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"context" |
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"strings" |
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"github.com/mxschmitt/golang-url-shortener/internal/util" |
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"github.com/sirupsen/logrus" |
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oidc "github.com/coreos/go-oidc" |
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"github.com/pkg/errors" |
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"golang.org/x/oauth2" |
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) |
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type genericOIDCAdapter struct { |
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config *oauth2.Config |
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oidc *oidc.Config |
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provider *oidc.Provider |
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} |
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type claims struct { |
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PreferredUsername string `json:"sub"` |
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Name string `json:"name"` |
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GivenName string `json:"given_name"` |
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FamilyName string `json:"family_name"` |
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ACR string `json:"acr"` |
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} |
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// NewGenericOIDCAdapter creates an oAuth adapter out of the credentials and the baseURL
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func NewGenericOIDCAdapter(clientID, clientSecret, endpointURL string) Adapter { |
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endpointURL = strings.TrimSuffix(endpointURL, "/") |
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if endpointURL == "" { |
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logrus.Error("Configure GenericOIDC Endpoint") |
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} |
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ctx := context.Background() |
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provider, err := oidc.NewProvider(ctx, endpointURL) |
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if err != nil { |
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logrus.Error("Configure GenericOIDC Endpoint: " + err.Error()) |
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} |
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redirectURL := util.GetConfig().BaseURL + "/api/v1/auth/generic_oidc/callback" |
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// Configure an OpenID Connect aware OAuth client.
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return &genericOIDCAdapter{ |
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config: &oauth2.Config{ |
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ClientID: clientID, |
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ClientSecret: clientSecret, |
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RedirectURL: redirectURL, |
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// Discovery returns the OAuth endpoints.
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Endpoint: provider.Endpoint(), |
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// "openid" is a required scope for OpenID Connect flows.
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Scopes: []string{ |
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"profile", |
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"openid", |
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"offline_access", |
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}, |
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}, |
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oidc: &oidc.Config{ |
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ClientID: clientID, |
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}, |
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provider: provider, |
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} |
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} |
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func (a *genericOIDCAdapter) GetRedirectURL(state string) string { |
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return a.config.AuthCodeURL(state) |
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} |
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func (a *genericOIDCAdapter) GetUserData(state, code string) (*user, error) { |
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logrus.Debugf("Getting User Data with state: %s, and code: %s", state, code) |
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oAuthToken, err := a.config.Exchange(context.Background(), code) |
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if err != nil { |
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return nil, errors.Wrap(err, "could not exchange code") |
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} |
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rawIDToken, ok := oAuthToken.Extra("id_token").(string) |
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if !ok { |
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return nil, errors.Wrap(err, "No id_token field in oauth2 token.") |
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} |
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idToken, err := a.provider.Verifier(a.oidc).Verify(context.Background(), rawIDToken) |
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if err != nil { |
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return nil, errors.Wrap(err, "Something went wrong verifying the token: "+err.Error()) |
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} |
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var oUser claims |
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if err = idToken.Claims(&oUser); err != nil { |
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return nil, errors.Wrap(err, "Something went wrong verifying the token: "+err.Error()) |
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} |
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return &user{ |
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ID: string(oUser.PreferredUsername), |
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Name: oUser.Name, |
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Picture: util.GetConfig().BaseURL + "/images/generic_oidc_logo.png", // Default GenericOIDC Avatar
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}, nil |
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} |
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func (a *genericOIDCAdapter) GetOAuthProviderName() string { |
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return "generic_oidc" |
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} |
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