Class: PuavoRest::SSO

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# File 'resources/sso.rb', line 113

def fetch_external_service
  ExternalService.by_url(params["return_to"]) if params["return_to"]
end

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# File 'resources/sso.rb', line 192

def handheld?
  browser.ios? || browser.android? || browser.nokia? || browser.rim?
end

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# File 'resources/sso.rb', line 188

def invalid_credentials?
  env["REQUEST_METHOD"] == "POST" && !params["password"].to_s.empty?
end

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# File 'resources/sso.rb', line 270

def preferred_organisation
  [
    params["organisation"],
    request.host,
  ].compact.map do |org|
    ensure_topdomain(org)
  end.map do |org|
    Organisation.by_domain(org)
  end.first
end

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# File 'resources/sso.rb', line 196

def render_form(error_message, err=nil)
  if env["REQUEST_METHOD"] == "POST"
    @error_message = error_message
    err_msg = {
      :login_ok => false,
      :reason => error_message,
      :params => params
    }
    if err
      err_msg[:error_class] = err.class.name
      err_msg[:error_message] = err.message
      err_msg[:meta] = err.meta
      err_msg[:organisation_domain] = Organisation.current.domain
    end
    flog.warn "sso", err_msg
  end

  @external_service ||= fetch_external_service
  @organisation = preferred_organisation

  if !(browser.linux? && browser.gecko?)
    # Kerberos authentication works only on Opinsys desktops with Firefox.
    # Disable authentication negotiation on others since it  may cause
    # unwanted basic auth popups (at least Chrome & IE @ Windows).
    response.headers.delete("WWW-Authenticate")
  end

  @login_content = {
    "opinsys_logo_url" => "/v3/img/opinsys_logo.png",
    "external_service_name" =>  @external_service["name"],
    "return_to" => params["return_to"],
    "organisation" => @organisation,
    "username_placeholder" => username_placeholder,
    "username" => params["username"],
    "invalid_credentials?" => invalid_credentials?,
    "handheld?" => handheld?,
    "error_message" => @error_message,
    "topdomain" => topdomain,
    "login_helper_js_url" => "/v3/scripts/login_helpers.js",
    "text_password" => t.sso.password,
    "text_login" => t.sso.login,
    "text_help" => t.sso.help,
    "text_username_help" => t.sso.username_help,
    "text_organisation_help" => t.sso.organisation_help,
    "text_developers" => t.sso.developers,
    "text_developers_info" => t.sso.developers_info,
    "support_info" => t.sso.support_info,
    "text_login_to" => t.sso.login_to
  }

  halt 401, {'Content-Type' => 'text/html'}, erb(:login_form, :layout => :layout)
end

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# File 'resources/sso.rb', line 125

def respond_auth
  if return_to.nil?
    raise BadInput, :user => "return_to missing"
  end

  @external_service = fetch_external_service

  if @external_service.nil?
    raise Unauthorized,
      :user => "Unknown client service #{ return_to.host }"
  end

  begin
    auth :basic_auth, :from_post, :kerberos
  rescue KerberosError => err
    return render_form(t.sso.kerberos_error, err)
  rescue JSONError => err
    # Pass custom error headers to the response login page
    response.headers.merge!(err.headers)
    return render_form(t.sso.bad_username_or_pw, err)
  end

  user = User.current
  primary_school = user.school

  # Read organisation data manually instead of using the cached one because
  # enabled external services might be updated.
  organisation = LdapModel.setup(:credentials => CONFIG["server"]) do
    Organisation.by_dn(LdapModel.organisation["dn"])
  end

  school_allows = Array(primary_school["external_services"]).
    include?(@external_service["dn"])
  organisation_allows = Array(organisation["external_services"]).
    include?(@external_service["dn"])
  trusted = @external_service["trusted"]

  if not (trusted || school_allows || organisation_allows)
    return render_form(t.sso.service_not_activated)
  end


  url = @external_service.generate_login_url(user, return_to)
  logger.info "Redirecting SSO auth #{ user["first_name"] } #{ user["last_name"] } (#{ user["dn"] } to #{ url }"

  flog.info("sso login ok", {
    :return_to => return_to,
    :external_service => @external_service.to_hash,
    :user => user
  })

  flog.info("sso", {
    :login_ok => true,
    :return_to => return_to
  })

  redirect url
end

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# File 'resources/sso.rb', line 109

def return_to
  Addressable::URI.parse(params["return_to"]) if params["return_to"]
end

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# File 'resources/sso.rb', line 258

def topdomain
  CONFIG["topdomain"]
end

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# File 'resources/sso.rb', line 117

def username_placeholder
  if preferred_organisation
    t.sso.username
  else
    "#{ t.sso.username }@#{ t.sso.organisation }.#{ topdomain }"
  end
end

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# File 'resources/sso.rb', line 249

def username_prefill
  [
    # what user typed last
    params["username"],
    # organisation presetting
    (@organisation ? "@#{ @organisation["domain"] }" : nil),
  ].compact.first
end