82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
package handlers
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import (
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"bytes"
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"context"
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"encoding/base64"
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"encoding/json"
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"net/http"
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"net/url"
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"github.com/lestrrat-go/jwx/jwk"
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"github.com/lestrrat-go/jwx/jwt"
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"github.com/lestrrat-go/jwx/jwt/openid"
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log "github.com/sirupsen/logrus"
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"git.cacert.org/oidc_login/app/services"
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"git.cacert.org/oidc_login/common/models"
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commonServices "git.cacert.org/oidc_login/common/services"
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)
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const sessionName = "resource_session"
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func Authenticate(ctx context.Context, logger *log.Logger, clientId string) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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session, err := services.GetSessionStore().Get(r, sessionName)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if _, ok := session.Values[sessionKeyIdToken]; ok {
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next.ServeHTTP(w, r)
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return
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}
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session.Values[sessionRedirectTarget] = r.URL.String()
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if err = session.Save(r, w); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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var authUrl *url.URL
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if authUrl, err = url.Parse(commonServices.GetOAuth2Config(ctx).Endpoint.AuthURL); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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queryValues := authUrl.Query()
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queryValues.Set("client_id", clientId)
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queryValues.Set("response_type", "code")
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queryValues.Set("scope", "openid offline_access profile email")
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queryValues.Set("state", base64.URLEncoding.EncodeToString(commonServices.GenerateKey(8)))
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queryValues.Set("claims", getRequestedClaims(logger))
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authUrl.RawQuery = queryValues.Encode()
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w.Header().Set("Location", authUrl.String())
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w.WriteHeader(http.StatusFound)
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})
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}
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}
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func getRequestedClaims(logger *log.Logger) string {
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claims := make(models.OIDCClaimsRequest)
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claims["userinfo"] = make(models.ClaimElement)
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essentialItem := make(models.IndividualClaimRequest)
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essentialItem["essential"] = true
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claims["userinfo"]["https://cacert.localhost/groups"] = &essentialItem
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target := make([]byte, 0)
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buf := bytes.NewBuffer(target)
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enc := json.NewEncoder(buf)
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if err := enc.Encode(claims); err != nil {
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logger.Warnf("could not encode claims request parameter: %v", err)
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}
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return buf.String()
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}
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func ParseIdToken(token string, keySet *jwk.Set) (openid.Token, error) {
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if parsedIdToken, err := jwt.ParseString(token, jwt.WithKeySet(keySet), jwt.WithOpenIDClaims()); err != nil {
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return nil, err
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} else {
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return parsedIdToken.(openid.Token), nil
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}
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}
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