from oauth.services.github import GithubOAuthService
from util.config.validators import BaseValidator, ConfigValidationException

class BaseGitHubValidator(BaseValidator):
  name = None
  config_key = None

  @classmethod
  def validate(cls, validator_context):
    """ Validates the OAuth credentials and API endpoint for a Github service. """
    config = validator_context.config
    client = validator_context.http_client
    url_scheme_and_hostname = validator_context.url_scheme_and_hostname

    github_config = config.get(cls.config_key)
    if not github_config:
      raise ConfigValidationException('Missing GitHub client id and client secret')

    endpoint = github_config.get('GITHUB_ENDPOINT')
    if not endpoint:
      raise ConfigValidationException('Missing GitHub Endpoint')

    if endpoint.find('http://') != 0 and endpoint.find('https://') != 0:
      raise ConfigValidationException('Github Endpoint must start with http:// or https://')

    if not github_config.get('CLIENT_ID'):
      raise ConfigValidationException('Missing Client ID')

    if not github_config.get('CLIENT_SECRET'):
      raise ConfigValidationException('Missing Client Secret')

    if github_config.get('ORG_RESTRICT') and not github_config.get('ALLOWED_ORGANIZATIONS'):
      raise ConfigValidationException('Organization restriction must have at least one allowed ' +
                                      'organization')

    oauth = GithubOAuthService(config, cls.config_key)
    result = oauth.validate_client_id_and_secret(client, url_scheme_and_hostname)
    if not result:
      raise ConfigValidationException('Invalid client id or client secret')

    if github_config.get('ALLOWED_ORGANIZATIONS'):
      for org_id in github_config.get('ALLOWED_ORGANIZATIONS'):
        if not oauth.validate_organization(org_id, client):
          raise ConfigValidationException('Invalid organization: %s' % org_id)


class GitHubLoginValidator(BaseGitHubValidator):
  name = "github-login"
  config_key = "GITHUB_LOGIN_CONFIG"

class GitHubTriggerValidator(BaseGitHubValidator):
  name = "github-trigger"
  config_key = "GITHUB_TRIGGER_CONFIG"