nextcloud-server/apps/files_external/js/oauth1.js

$(document).ready(function() {

	function displayGranted($tr) {
		$tr.find('.configuration input.auth-param').attr('disabled', 'disabled').addClass('disabled-success');
	}

	OCA.Files_External.Settings.mountConfig.whenSelectAuthMechanism(function($tr, authMechanism, scheme, onCompletion) {
		if (authMechanism === 'oauth1::oauth1') {
			var config = $tr.find('.configuration');
			config.append($(document.createElement('input'))
				.addClass('button auth-param')
				.attr('type', 'button')
				.attr('value', t('files_external', 'Grant access'))
				.attr('name', 'oauth1_grant')
			);

			onCompletion.then(function() {
				var configured = $tr.find('[data-parameter="configured"]');
				if ($(configured).val() == 'true') {
					displayGranted($tr);
				} else {
					var app_key = $tr.find('.configuration [data-parameter="app_key"]').val();
					var app_secret = $tr.find('.configuration [data-parameter="app_secret"]').val();
					if (app_key != '' && app_secret != '') {
						var pos = window.location.search.indexOf('oauth_token') + 12;
						var token = $tr.find('.configuration [data-parameter="token"]');
						if (pos != -1 && window.location.search.substr(pos, $(token).val().length) == $(token).val()) {
							var token_secret = $tr.find('.configuration [data-parameter="token_secret"]');
							var statusSpan = $tr.find('.status span');
							statusSpan.removeClass();
							statusSpan.addClass('waiting');
							$.post(OC.filePath('files_external', 'ajax', 'oauth1.php'), { step: 2, app_key: app_key, app_secret: app_secret, request_token: $(token).val(), request_token_secret: $(token_secret).val() }, function(result) {
								if (result && result.status == 'success') {
									$(token).val(result.access_token);
									$(token_secret).val(result.access_token_secret);
									$(configured).val('true');
									OCA.Files_External.Settings.mountConfig.saveStorageConfig($tr, function(status) {
										if (status) {
											displayGranted($tr);
										}
									});
								} else {
									OC.dialogs.alert(result.data.message, t('files_external', 'Error configuring OAuth1'));
								}
							});
						}
					}
				}
			});
		}
	});

	$('#externalStorage').on('click', '[name="oauth1_grant"]', function(event) {
		event.preventDefault();
		var tr = $(this).parent().parent();
		var app_key = $(this).parent().find('[data-parameter="app_key"]').val();
		var app_secret = $(this).parent().find('[data-parameter="app_secret"]').val();
		if (app_key != '' && app_secret != '') {
			var configured = $(this).parent().find('[data-parameter="configured"]');
			var token = $(this).parent().find('[data-parameter="token"]');
			var token_secret = $(this).parent().find('[data-parameter="token_secret"]');
			$.post(OC.filePath('files_external', 'ajax', 'oauth1.php'), { step: 1, app_key: app_key, app_secret: app_secret, callback: location.protocol + '//' + location.host + location.pathname }, function(result) {
				if (result && result.status == 'success') {
					$(configured).val('false');
					$(token).val(result.data.request_token);
					$(token_secret).val(result.data.request_token_secret);
					OCA.Files_External.Settings.mountConfig.saveStorageConfig(tr, function() {
						window.location = result.data.url;
					});
				} else {
					OC.dialogs.alert(result.data.message, t('files_external', 'Error configuring OAuth1'));
				}
			});
		} else {
			OC.dialogs.alert(
				t('files_external', 'Please provide a valid app key and secret.'),
				t('files_external', 'Error configuring OAuth1')
			);
		}
	});

});