149 lines
4.2 KiB
Go
149 lines
4.2 KiB
Go
package user
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import (
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"errors"
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"fmt"
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"net/url"
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"time"
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"github.com/jonboulle/clockwork"
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"github.com/coreos/go-oidc/jose"
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"github.com/coreos/go-oidc/key"
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"github.com/coreos/go-oidc/oidc"
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)
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const (
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// Claim representing where a user should be sent after verifying their email address.
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ClaimEmailVerificationCallback = "http://coreos.com/email/verification-callback"
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// ClaimEmailVerificationEmail represents the email to be verified. Note
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// that we are intentionally not using the "email" claim for this purpose.
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ClaimEmailVerificationEmail = "http://coreos.com/email/verificationEmail"
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)
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var (
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clock = clockwork.NewRealClock()
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)
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// NewEmailVerification creates an object which can be sent to a user in serialized form to verify that they control an email address.
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// The clientID is the ID of the registering user. The callback is where a user should land after verifying their email.
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func NewEmailVerification(user User, clientID string, issuer url.URL, callback url.URL, expires time.Duration) EmailVerification {
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claims := oidc.NewClaims(issuer.String(), user.ID, clientID, clock.Now(), clock.Now().Add(expires))
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claims.Add(ClaimEmailVerificationCallback, callback.String())
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claims.Add(ClaimEmailVerificationEmail, user.Email)
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return EmailVerification{claims}
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}
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type EmailVerification struct {
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claims jose.Claims
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}
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// Token serializes the EmailVerification into a signed JWT.
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func (e EmailVerification) Token(signer jose.Signer) (string, error) {
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if signer == nil {
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return "", errors.New("no signer")
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}
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jwt, err := jose.NewSignedJWT(e.claims, signer)
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if err != nil {
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return "", err
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}
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return jwt.Encode(), nil
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}
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// ParseAndVerifyEmailVerificationToken parses a string into a an EmailVerification, verifies the signature, and ensures that required claims are present.
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// In addition to the usual claims required by the OIDC spec, "aud" and "sub" must be present as well as ClaimEmailVerificationCallback and ClaimEmailVerificationEmail.
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func ParseAndVerifyEmailVerificationToken(token string, issuer url.URL, keys []key.PublicKey) (EmailVerification, error) {
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jwt, err := jose.ParseJWT(token)
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if err != nil {
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return EmailVerification{}, err
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}
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claims, err := jwt.Claims()
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if err != nil {
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return EmailVerification{}, err
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}
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clientID, ok, err := claims.StringClaim("aud")
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if err != nil {
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return EmailVerification{}, err
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}
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if !ok {
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return EmailVerification{}, errors.New("no aud(client ID) claim")
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}
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cb, ok, err := claims.StringClaim(ClaimEmailVerificationCallback)
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if err != nil {
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return EmailVerification{}, err
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}
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if cb == "" {
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return EmailVerification{}, fmt.Errorf("no %q claim", ClaimEmailVerificationCallback)
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}
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if _, err := url.Parse(cb); err != nil {
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return EmailVerification{}, fmt.Errorf("callback URL not parseable: %v", cb)
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}
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email, ok, err := claims.StringClaim(ClaimEmailVerificationEmail)
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if err != nil {
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return EmailVerification{}, err
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}
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if email == "" {
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return EmailVerification{}, fmt.Errorf("no %q claim", ClaimEmailVerificationEmail)
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}
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sub, ok, err := claims.StringClaim("sub")
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if err != nil {
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return EmailVerification{}, err
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}
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if sub == "" {
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return EmailVerification{}, errors.New("no sub claim")
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}
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noop := func() error { return nil }
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keysFunc := func() []key.PublicKey {
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return keys
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}
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verifier := oidc.NewJWTVerifier(issuer.String(), clientID, noop, keysFunc)
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if err := verifier.Verify(jwt); err != nil {
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return EmailVerification{}, err
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}
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return EmailVerification{
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claims: claims,
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}, nil
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}
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func (e EmailVerification) UserID() string {
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uid, ok, err := e.claims.StringClaim("sub")
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if !ok || err != nil {
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panic("EmailVerification: no sub claim. This should be impossible.")
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}
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return uid
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}
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func (e EmailVerification) Email() string {
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email, ok, err := e.claims.StringClaim(ClaimEmailVerificationEmail)
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if !ok || err != nil {
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panic("EmailVerification: no email claim. This should be impossible.")
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}
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return email
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}
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func (e EmailVerification) Callback() *url.URL {
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cb, ok, err := e.claims.StringClaim(ClaimEmailVerificationCallback)
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if !ok || err != nil {
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panic("EmailVerification: no callback claim. This should be impossible.")
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}
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cbURL, err := url.Parse(cb)
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if err != nil {
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panic("EmailVerificaiton: can't parse callback. This should be impossible.")
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}
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return cbURL
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}
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