src/Composer/Util/GitLab.php
public function authorizeOAuth($originUrl)
    {
        if (!in_array($originUrl, $this->config->get('gitlab-domains'), true)) {
            return false;
        }

        // if available use token from git config
        if (0 === $this->process->execute('git config gitlab.accesstoken', $output)) {
            $this->io->setAuthentication($originUrl, trim($output), 'oauth2');

            return true;
        }

        // if available use token from composer config
        $authTokens = $this->config->get('gitlab-token');

        if (isset($authTokens[$originUrl])) {
            $this->io->setAuthentication($originUrl, $authTokens[$originUrl], 'private-token');

            return true;
        }

        return false;
    }
public function authorizeOAuth($originUrl)
    {
        if (!in_array($originUrl, $this->config->get('gitlab-domains'), true)) {
            return false;
        }

        // if available use token from git config
        if (0 === $this->process->execute('git config gitlab.accesstoken', $output)) {
            $this->io->setAuthentication($originUrl, trim($output), 'oauth2');

            return true;
        }

        // if available use token from composer config
        $authTokens = $this->config->get('gitlab-token');

        if (isset($authTokens[$originUrl])) {
            $this->io->setAuthentication($originUrl, $authTokens[$originUrl], 'private-token');

            return true;
        }

        return false;
    }
Attempts to authorize a GitLab domain via OAuth.

@param string $originUrl The host this GitLab instance is located at

@return bool true on success