def pre(self):
        set_extension(request.environ, "json")
        MinimalController.pre(self)
        require_https()

        try:
            access_token = OAuth2AccessToken.get_token(self._get_bearer_token())
            require(access_token)
            require(access_token.check_valid())
            c.oauth2_access_token = access_token
            account = Account._byID36(access_token.user_id, data=True)
            require(account)
            require(not account._deleted)
            c.oauth_user = account
        except RequirementException:
            self._auth_error(401, "invalid_token")

        handler = self._get_action_handler()
        if handler:
            oauth2_perms = getattr(handler, "oauth2_perms", None)
            if oauth2_perms:
                grant = OAuth2Scope(access_token.scope)
                if grant.subreddit_only and c.site.name not in grant.subreddits:
                    self._auth_error(403, "insufficient_scope")
                required_scopes = set(oauth2_perms['allowed_scopes'])
                if not (grant.scopes >= required_scopes):
                    self._auth_error(403, "insufficient_scope")
            else:
                self._auth_error(400, "invalid_request")

    def pre(self):
        if g.disallow_db_writes:
            abort(403)

        set_extension(request.environ, "json")
        MinimalController.pre(self)
        require_https()
        if request.method != "OPTIONS":
            c.oauth2_client = self._get_client_auth()

    def pre(self):
        set_extension(request.environ, "json")
        MinimalController.pre(self)
        require_https()

        try:
            access_token = self._get_bearer_token()
            require(access_token)
            c.oauth2_access_token = access_token
            account = Account._byID(access_token.user_id, data=True)
            require(account)
            require(not account._deleted)
            c.oauth_user = account
        except RequirementException:
            self._auth_error(401, "invalid_token")

        handler = self._get_action_handler()
        if handler:
            oauth2_perms = getattr(handler, "oauth2_perms", None)
            if oauth2_perms:
                if access_token.scope not in oauth2_perms["allowed_scopes"]:
                    self._auth_error(403, "insufficient_scope")
            else:
                self._auth_error(400, "invalid_request")