mirror of
https://github.com/matrix-org/dendrite.git
synced 2024-11-27 00:31:55 -06:00
120 lines
3.5 KiB
Go
120 lines
3.5 KiB
Go
package routing
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"net/http"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/setup/config"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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)
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// The data used to populate the /consent request
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type constentTemplateData struct {
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User string
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Version string
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UserHMAC string
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HasConsented bool
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PublicVersion bool
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}
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func consent(writer http.ResponseWriter, req *http.Request, userAPI userapi.UserInternalAPI, cfg *config.ClientAPI) *util.JSONResponse {
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consentCfg := cfg.Matrix.UserConsentOptions
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internalError := jsonerror.InternalServerError()
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// The data used to populate the /consent request
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data := constentTemplateData{
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User: req.FormValue("u"),
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Version: req.FormValue("v"),
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UserHMAC: req.FormValue("h"),
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}
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switch req.Method {
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case http.MethodGet:
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// display the privacy policy without a form
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data.PublicVersion = data.User == "" || data.UserHMAC == "" || data.Version == ""
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// let's see if the user already consented to the current version
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if !data.PublicVersion {
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res := &userapi.QueryPolicyVersionResponse{}
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localPart, _, err := gomatrixserverlib.SplitID('@', data.User)
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if err != nil {
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logrus.WithError(err).Error("unable to print consent template")
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return &internalError
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}
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if err = userAPI.QueryPolicyVersion(req.Context(), &userapi.QueryPolicyVersionRequest{
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LocalPart: localPart,
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}, res); err != nil {
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logrus.WithError(err).Error("unable to print consent template")
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return &internalError
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}
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data.HasConsented = res.PolicyVersion == consentCfg.Version
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}
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err := consentCfg.Templates.ExecuteTemplate(writer, consentCfg.Version+".gohtml", data)
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if err != nil {
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logrus.WithError(err).Error("unable to print consent template")
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return nil
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}
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return nil
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case http.MethodPost:
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localPart, _, err := gomatrixserverlib.SplitID('@', data.User)
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if err != nil {
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logrus.WithError(err).Error("unable to split username")
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return &internalError
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}
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ok, err := validHMAC(data.User, data.UserHMAC, consentCfg.FormSecret)
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if err != nil || !ok {
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_, err = writer.Write([]byte("invalid HMAC provided"))
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if err != nil {
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return &internalError
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}
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return &internalError
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}
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if err := userAPI.PerformUpdatePolicyVersion(
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req.Context(),
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&userapi.UpdatePolicyVersionRequest{
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PolicyVersion: data.Version,
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LocalPart: localPart,
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},
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&userapi.UpdatePolicyVersionResponse{},
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); err != nil {
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_, err = writer.Write([]byte("unable to update database"))
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if err != nil {
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logrus.WithError(err).Error("unable to write to database")
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}
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return &internalError
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}
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// display the privacy policy without a form
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data.PublicVersion = false
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data.HasConsented = true
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err = consentCfg.Templates.ExecuteTemplate(writer, consentCfg.Version+".gohtml", data)
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if err != nil {
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logrus.WithError(err).Error("unable to print consent template")
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return &internalError
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}
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return nil
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}
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return &util.JSONResponse{Code: http.StatusOK}
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}
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func validHMAC(username, userHMAC, secret string) (bool, error) {
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mac := hmac.New(sha256.New, []byte(secret))
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_, err := mac.Write([]byte(username))
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if err != nil {
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return false, err
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}
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expectedMAC := mac.Sum(nil)
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decoded, err := hex.DecodeString(userHMAC)
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if err != nil {
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return false, err
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}
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return hmac.Equal(decoded, expectedMAC), nil
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}
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