<?php

final class PhabricatorAuthProviderOAuth1JIRA
  extends PhabricatorAuthProviderOAuth1 {

  public function getJIRABaseURI() {
    return $this->getProviderConfig()->getProperty(self::PROPERTY_JIRA_URI);
  }

  public function getProviderName() {
    return pht('JIRA');
  }

  public function getConfigurationHelp() {
    if ($this->isSetup()) {
      return pht(
        "**Step 1 of 2**: Provide the name and URI for your JIRA install.\n\n".
        "In the next step, you will configure JIRA.");
    } else {
      $login_uri = $this->getLoginURI();
      return pht(
        "**Step 2 of 2**: In this step, you will configure JIRA.\n\n".
        "**Create a JIRA Application**: Log into JIRA and go to ".
        "**Administration**, then **Add-ons**, then **Application Links**. ".
        "Click the button labeled **Add Application Link**, and use these ".
        "settings to create an application:\n\n".
        "  - **Server URL**: `%s`\n".
        "  - Then, click **Next**. On the second page:\n".
        "  - **Application Name**: `Phabricator`\n".
        "  - **Application Type**: `Generic Application`\n".
        "  - Then, click **Create**.\n\n".
        "**Configure Your Application**: Find the application you just ".
        "created in the table, and click the **Configure** link under ".
        "**Actions**. Select **Incoming Authentication** and click the ".
        "**OAuth** tab (it may be selected by default). Then, use these ".
        "settings:\n\n".
        "  - **Consumer Key**: Set this to the \"Consumer Key\" value in the ".
        "form above.\n".
        "  - **Consumer Name**: `Phabricator`\n".
        "  - **Public Key**: Set this to the \"Public Key\" value in the ".
        "form above.\n".
        "  - **Consumer Callback URL**: `%s`\n".
        "Click **Save** in JIRA. Authentication should now be configured, ".
        "and this provider should work correctly.",
        PhabricatorEnv::getProductionURI('/'),
        $login_uri);
    }
  }

  protected function newOAuthAdapter() {
    $config = $this->getProviderConfig();

    return id(new PhutilAuthAdapterOAuthJIRA())
      ->setAdapterDomain($config->getProviderDomain())
      ->setJIRABaseURI($config->getProperty(self::PROPERTY_JIRA_URI))
      ->setPrivateKey(
        new PhutilOpaqueEnvelope(
          $config->getProperty(self::PROPERTY_PRIVATE_KEY)));
  }

  protected function getLoginIcon() {
    return 'Jira';
  }

  private function isSetup() {
    return !$this->getProviderConfig()->getID();
  }

  const PROPERTY_JIRA_NAME = 'oauth1:jira:name';
  const PROPERTY_JIRA_URI = 'oauth1:jira:uri';
  const PROPERTY_PUBLIC_KEY = 'oauth1:jira:key:public';
  const PROPERTY_PRIVATE_KEY = 'oauth1:jira:key:private';


  public function readFormValuesFromProvider() {
    $config = $this->getProviderConfig();
    $uri = $config->getProperty(self::PROPERTY_JIRA_URI);

    return array(
      self::PROPERTY_JIRA_NAME => $this->getProviderDomain(),
      self::PROPERTY_JIRA_URI => $uri,
    );
  }

  public function readFormValuesFromRequest(AphrontRequest $request) {
    $is_setup = $this->isSetup();
    if ($is_setup) {
      $name = $request->getStr(self::PROPERTY_JIRA_NAME);
    } else {
      $name = $this->getProviderDomain();
    }

    return array(
      self::PROPERTY_JIRA_NAME => $name,
      self::PROPERTY_JIRA_URI => $request->getStr(self::PROPERTY_JIRA_URI),
    );
  }

  public function processEditForm(
    AphrontRequest $request,
    array $values) {
    $errors = array();
    $issues = array();

    $is_setup = $this->isSetup();

    $key_name = self::PROPERTY_JIRA_NAME;
    $key_uri = self::PROPERTY_JIRA_URI;

    if (!strlen($values[$key_name])) {
      $errors[] = pht('JIRA instance name is required.');
      $issues[$key_name] = pht('Required');
    } else if (!preg_match('/^[a-z0-9.]+$/', $values[$key_name])) {
      $errors[] = pht(
        'JIRA instance name must contain only lowercase letters, digits, and '.
        'period.');
      $issues[$key_name] = pht('Invalid');
    }

    if (!strlen($values[$key_uri])) {
      $errors[] = pht('JIRA base URI is required.');
      $issues[$key_uri] = pht('Required');
    } else {
      $uri = new PhutilURI($values[$key_uri]);
      if (!$uri->getProtocol()) {
        $errors[] = pht(
          'JIRA base URI should include protocol (like "https://").');
        $issues[$key_uri] = pht('Invalid');
      }
    }

    if (!$errors && $is_setup) {
      $config = $this->getProviderConfig();

      $config->setProviderDomain($values[$key_name]);

      $consumer_key = 'phjira.'.Filesystem::readRandomCharacters(16);
      list($public, $private) = PhutilAuthAdapterOAuthJIRA::newJIRAKeypair();

      $config->setProperty(self::PROPERTY_PUBLIC_KEY, $public);
      $config->setProperty(self::PROPERTY_PRIVATE_KEY, $private);
      $config->setProperty(self::PROPERTY_CONSUMER_KEY, $consumer_key);
    }

    return array($errors, $issues, $values);
  }

  public function extendEditForm(
    AphrontRequest $request,
    AphrontFormView $form,
    array $values,
    array $issues) {

    if (!function_exists('openssl_pkey_new')) {
      // TODO: This could be a bit prettier.
      throw new Exception(
        pht(
          "The PHP 'openssl' extension is not installed. You must install ".
          "this extension in order to add a JIRA authentication provider, ".
          "because JIRA OAuth requests use the RSA-SHA1 signing algorithm. ".
          "Install the 'openssl' extension, restart your webserver, and try ".
          "again."));
    }

    $is_setup = $this->isSetup();

    $e_required = $request->isFormPost() ? null : true;

    $v_name = $values[self::PROPERTY_JIRA_NAME];
    if ($is_setup) {
      $e_name = idx($issues, self::PROPERTY_JIRA_NAME, $e_required);
    } else {
      $e_name = null;
    }

    $v_uri = $values[self::PROPERTY_JIRA_URI];
    $e_uri = idx($issues, self::PROPERTY_JIRA_URI, $e_required);

    if ($is_setup) {
      $form
        ->appendRemarkupInstructions(
          pht(
            "**JIRA Instance Name**\n\n".
            "Choose a permanent name for this instance of JIRA. Phabricator ".
            "uses this name internally to keep track of this instance of ".
            "JIRA, in case the URL changes later.\n\n".
            "Use lowercase letters, digits, and period. For example, ".
            "`jira`, `jira.mycompany` or `jira.engineering` are reasonable ".
            "names."))
        ->appendChild(
          id(new AphrontFormTextControl())
            ->setLabel(pht('JIRA Instance Name'))
            ->setValue($v_name)
            ->setName(self::PROPERTY_JIRA_NAME)
            ->setError($e_name));
    } else {
      $form
        ->appendChild(
          id(new AphrontFormStaticControl())
            ->setLabel(pht('JIRA Instance Name'))
            ->setValue($v_name));
    }

    $form
      ->appendChild(
        id(new AphrontFormTextControl())
          ->setLabel(pht('JIRA Base URI'))
          ->setValue($v_uri)
          ->setName(self::PROPERTY_JIRA_URI)
          ->setCaption(
            pht(
              'The URI where JIRA is installed. For example: %s',
              phutil_tag('tt', array(), 'https://jira.mycompany.com/')))
          ->setError($e_uri));

    if (!$is_setup) {
      $config = $this->getProviderConfig();


      $ckey = $config->getProperty(self::PROPERTY_CONSUMER_KEY);
      $ckey = phutil_tag('tt', array(), $ckey);

      $pkey = $config->getProperty(self::PROPERTY_PUBLIC_KEY);
      $pkey = phutil_escape_html_newlines($pkey);
      $pkey = phutil_tag('tt', array(), $pkey);

      $form
        ->appendRemarkupInstructions(
          pht(
            'NOTE: **To complete setup**, copy and paste these keys into JIRA '.
            'according to the instructions below.'))
        ->appendChild(
          id(new AphrontFormStaticControl())
            ->setLabel(pht('Consumer Key'))
            ->setValue($ckey))
        ->appendChild(
          id(new AphrontFormStaticControl())
            ->setLabel(pht('Public Key'))
            ->setValue($pkey));
    }

  }


  /**
   * JIRA uses a setup step to generate public/private keys.
   */
  public function hasSetupStep() {
    return true;
  }

  public static function getJIRAProvider() {
    $providers = self::getAllEnabledProviders();

    foreach ($providers as $provider) {
      if ($provider instanceof PhabricatorAuthProviderOAuth1JIRA) {
        return $provider;
      }
    }

    return null;
  }

  public function newJIRAFuture(
    PhabricatorExternalAccount $account,
    $path,
    $method,
    $params = array()) {

    $adapter = clone $this->getAdapter();
    $adapter->setToken($account->getProperty('oauth1.token'));
    $adapter->setTokenSecret($account->getProperty('oauth1.token.secret'));

    return $adapter->newJIRAFuture($path, $method, $params);
  }

}
