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dex/vendor/github.com/ericchiang/oidc/doc.go

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/*
Package oidc implements OpenID Connect client logic for the golang.org/x/oauth2 package.
provider, err := oidc.NewProvider(ctx, "https://accounts.example.com")
if err != nil {
return err
}
// Configure an OpenID Connect aware OAuth2 client.
oauth2Config := oauth2.Config{
ClientID: clientID,
ClientSecret: clientSecret,
RedirectURL: redirectURL,
Endpoint: provider.Endpoint(),
Scopes: []string{oidc.ScopeOpenID, "profile", "email"},
}
OAuth2 redirects are unchanged.
func handleRedirect(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, oauth2Config.AuthCodeURL(state), http.StatusFound)
})
For callbacks the provider can be used to query for user information such as email.
func handleOAuth2Callback(w http.ResponseWriter, r *http.Request) {
// Verify state...
oauth2Token, err := oauth2Config.Exchange(ctx, r.URL.Query().Get("code"))
if err != nil {
http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError)
return
}
userinfo, err := provider.UserInfo(ctx, oauth2.StaticTokenSource(oauth2Token))
if err != nil {
http.Error(w, "Failed to get userinfo: "+err.Error(), http.StatusInternalServerError)
return
}
// ...
})
The provider also has the ability to verify ID Tokens.
verifier := provider.NewVerifier(ctx)
The returned verifier can be used to perform basic validation on ID Token issued by the provider,
including verifying the JWT signature. It then returns the payload.
func handleOAuth2Callback(w http.ResponseWriter, r *http.Request) {
// Verify state...
oauth2Token, err := oauth2Config.Exchange(ctx, r.URL.Query().Get("code"))
if err != nil {
http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError)
return
}
// Extract the ID Token from oauth2 token.
rawIDToken, ok := oauth2Token.Extra("id_token").(string)
if !ok {
http.Error(w, "No ID Token found", http.StatusInternalServerError)
return
}
// Verify that the ID Token is signed by the provider.
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idToken, err := verifier.Verify(rawIDToken)
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if err != nil {
http.Error(w, "Failed to verify ID Token: "+err.Error(), http.StatusInternalServerError)
return
}
// Unmarshal ID Token for expected custom claims.
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var claims struct {
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Email string `json:"email"`
EmailVerified bool `json:"email_verified"`
}
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if err := idToken.Claims(&claims); err != nil {
http.Error(w, "Failed to unmarshal ID Token custom claims: "+err.Error(), http.StatusInternalServerError)
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return
}
// ...
})
ID Token nonces are supported.
First, provide a nonce source for nonce validation. This will then be used to wrap the existing
provider ID Token verifier.
// A verifier which boths verifies the ID Token signature and nonce.
nonceEnabledVerifier := provider.NewVerifier(ctx, oidc.VerifyNonce(nonceSource))
For the redirect provide a nonce auth code option. This will be placed as a URL parameter during
the client redirect.
func handleRedirect(w http.ResponseWriter, r *http.Request) {
nonce, err := newNonce()
if err != nil {
// ...
}
// Provide a nonce for the OpenID Connect ID Token.
http.Redirect(w, r, oauth2Config.AuthCodeURL(state, oidc.Nonce(nonce)), http.StatusFound)
})
The nonce enabled verifier can then be used to verify the nonce while unpacking the ID Token.
func handleOAuth2Callback(w http.ResponseWriter, r *http.Request) {
// Verify state...
oauth2Token, err := oauth2Config.Exchange(ctx, r.URL.Query().Get("code"))
if err != nil {
http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError)
return
}
// Extract the ID Token from oauth2 token.
rawIDToken, ok := oauth2Token.Extra("id_token").(string)
if !ok {
http.Error(w, "No ID Token found", http.StatusInternalServerError)
return
}
// Verify that the ID Token is signed by the provider and verify the nonce.
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idToken, err := nonceEnabledVerifier.Verify(rawIDToken)
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if err != nil {
http.Error(w, "Failed to verify ID Token: "+err.Error(), http.StatusInternalServerError)
return
}
// Continue as above...
})
This package uses contexts to derive HTTP clients in the same way as the oauth2 package. To configure
a custom client, use the oauth2 packages HTTPClient context key when constructing the context.
myClient := &http.Client{}
myCtx := context.WithValue(parentCtx, oauth2.HTTPClient, myClient)
// NewProvider will use myClient to make the request.
provider, err := oidc.NewProvider(myCtx, "https://accounts.example.com")
*/
package oidc