refs https://github.com/TryGhost/Product/issues/3849
- Added small and medium variants of `LoadingIndicator` component
- Added `Loading` prop to `Button` component, which uses `LoadingIndicator`
- Updated instances of `Modal` component so they use the new `LoadingIndicator`
refs https://github.com/TryGhost/Product/issues/3832
- Updated tier benefits to be added when pressing enter
- Updated tier sorting logic to make sure free comes first
- Updated scrolling behaviour and made the sidebar scroll automatically
- Added placeholder backdrop when loading a modal to prevent flashing
And other minor fixes
- Removed placeholder from newsletter footer field
- Updated theme installation to work with the default theme
refs. https://github.com/TryGhost/Product/issues/3349
- fix tiers save & close bug
- show trial days on tier card
- removed 0's from monthly and yearly tier prices
- added color to learn more link in tier modal
- set background to white in newsletter preview
- fixed newsletter default sender data
- removed underline in "View in browser" link in newsletter preview
- updated copy in newsletters
- added Integrations' active indicator
- scrolling menu under searchbar to give search more prominance
- updated Portal modal buttons to be consistent with design settings
- fixed bug in AdminX loading Orb so that it actually starts auto-playing
no issue
- Solves an issue where it didn't fetch the updated staff token after
saving and still used the cached one which is invalidated.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 9a59225</samp>
Improved staff token handling in `UserDetailModal` component. This
component fetches and displays a staff token for a user in the general
settings, and prevents editing or errors.
refs https://github.com/TryGhost/Product/issues/3832
---
This pull request introduces a new `MainContent` component that handles
the role-based access and rendering of the settings page and the
sidebar. It also refactors and improves the UI and logic of the
`UserDetailModal` and the `Users` components, and updates the footer
component to use the new settings page and profile modal for editors.
Additionally, it removes unused code and adds new helper functions for
checking the user's roles and permissions.
no issue
- Attempts to resolve a flaky test.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 1a7d420</samp>
Refactor announcement bar preview test to use a helper function for
checking text in iframes. This improves code quality and readability.
refs
https://www.notion.so/ghost/Staff-access-token-is-missing-from-user-detail-screen-0336ea3e586c4b88ad7dae266a95429c?pvs=4
- Added API routes to retrieve and regenrate Staff Token keys.
- Wired up UI
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 6ae12a5</samp>
This pull request introduces a new feature for staff access tokens,
which enable users to access the Ghost Admin API securely and
conveniently. It adds a new `staffToken.ts` module for the API logic and
a new `StaffToken` component for the UI. It also integrates the feature
into the user profile and settings in the `general` page.
refs https://github.com/TryGhost/Product/issues/3832
---
Refactored the scrolling logic for the settings page into a custom hook
and context. This improves the navigation and user experience of the
settings page and simplifies the code. Added the file
`useScrollSection.tsx` and updated the files `SettingGroup.tsx`,
`SettingNavItem.tsx`, `RoutingProvider.tsx`, and `useRouting.tsx`
accordingly.
no issue
This pull request adds the Pintura image editor as an optional feature
for image settings in the admin-x.
It introduces a `usePinturaEditor` hook that handles the loading and
management of the Pintura editor instance, and a custom edit button for
the `ImageUpload` component that can open the editor.
It also modifies the `BrandSettings` and `UserDetailModel` component to use the hook and the button.
---------
Co-authored-by: Peter Zimon <peter.zimon@gmail.com>
refs https://github.com/TryGhost/Product/issues/3832
---
This pull request adds a new feature to filter and view the history of
actions performed by staff users in the admin settings. It introduces a
new route and a MultiSelect component for the history modal, and updates
the UserDetailModal component to link to the history modal with the user
parameter.
refs https://github.com/TryGhost/Product/issues/3832
- Fixed portal preview when no tiers are enabled
- Fixed portal preview not respecting access setting
- Disabled portal customisation when nobody can sign up
- Fixed custom theme settings not updated when theme is changed
- Added publication icon setting in newsletters
- Added extremely rudimentary editor role display
- Fixed drag overlay position in modals
no issue
Added the ability to create new labels for the embed signup form in the
admin-x-settings app. This involved importing a new component and adding
a prop to the `MultiSelect` component, and enabling the prop in the
`EmbedSignupSidebar` component.
refs. https://github.com/TryGhost/Product/issues/3349
- some of the UI components' scrollbar was visible where it wasn't necessary
- metadata preview was shown in view mode too
- social accounts value was shown even if it was empty
- user detail modal was missing field descriptions
- it was not possible to reopen the Zapier modal after closing it the "Close" button
- copy had to be updated for analytics export to make it clear what is going to be exported
- invite modal had to be closed after successful invitation
- toggle component was only active on the text itself, instead of the whole row
no issue
- Do not set ?ref in recommendations if analytics is disabled
- Do not send url_history if analytics is disabled
- Expose outboundLinkTagging as a public setting
no issue
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 318572f</samp>
Updated `@tryghost/admin-x-settings` package to version 0.0.16 with
dependency and bug fixes. This package provides the settings UI for the
Ghost admin app.
no issue
- Added a little delay to allow for a bit more time to load before
swapping.
- Also fixed a little bug where the array condition in the memo is
returning false.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 6cce5d7</samp>
Improved the loading behavior of the admin settings page by adding a
delay before showing the iframes. Fixed a typo in the `data-testid`
attribute of `IframeBuffering.tsx`.
no issue
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 910bfbe</samp>
Optimized theme settings component to use debounced function for
updating settings. This reduces API requests and improves UX.
refs https://github.com/TryGhost/Product/issues/3832
- Fixed code editor horizontal scroll
- Fixed toggle setting initial value in theme settings
- Prevented locking site without a password
- Updated to hide Pintura settings when config is set
- Updated mailgun settings to show only if not in server config
- Updated Pintura settings to hide banner when in server config
- Fixed body font category not updating in newsletter preview
- Fixed external images not loading when hosted
- Added character count to user bio
- Updated to scroll up when searching
- Fixed code editor not working with null value
- Improved form error messages
no issue
- fixed an issue where toggling the visibility of the announcement bar doesn't update the preview.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at bad7a08</samp>
Simplified the `AnnouncementBarPreview` component by using a shallow
equality check for the `visibility` prop. This is part of a refactor to
use React hooks and functional components.
refs https://github.com/TryGhost/Product/issues/3807https://github.com/TryGhost/Product/issues/3806
Added double buffering to iframes in Admin to have smoother transitions when swapping out iframes for preview pages.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at ad2b1a9</samp>
Refactored the announcement bar modal and preview components to use a
custom `IframeBuffering` component for better performance and
simplicity. Extracted the `IframeBuffering` component to a new file and
added some types and functions to support it. Removed some unused code
and cleaned up imports.
no refs
When `data-members-newsletter` was used with checkboxes, if no
checkboxes were selected then the backend would subscribe the member to
the default newsletters which is not what we want - We want to subscribe
the members only to the newsletters they have selected
no issue
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 49f8c6a</samp>
Updated `@tryghost/admin-x-settings` package to version 0.0.14 with new
features and bug fixes. This package provides the settings UI for the
Ghost admin panel.
refs https://github.com/TryGhost/Product/issues/3819
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 9e5d762</samp>
This pull request adds a color picker feature to the membership
settings, which lets the user customize the appearance of the embed
signup form. It modifies the `EmbedSignupFormModal` and
`EmbedSignupSidebar` components and uses the `ColorPicker` component
from the admin-x-ds library.
refs https://github.com/TryGhost/DevOps/issues/50
- when creating a TS config in our `eslint-plugin-ghost` dependency, I
only extended the recommended config, which left out a lot of
stylistic things we used to enforce in JS
- this fixes that by bumping the dependency to a version which extends
those shared configs, and fixes all the code that currently goes
against those rules
fixes https://github.com/TryGhost/Product/issues/3822
fixes https://github.com/TryGhost/Product/issues/3838
This PR became a bit big because it affected multiple parts of Ghost
that needed to be updated to prevent breaking anything.
### Backend
- Added pagination to the recommendations API's
- Updated BookshelfRepository template implementation to handle
pagination
- Allow to pass `page` and `limit` options to Models `findAll`, to allow
fetching a page without also fetching the count/metadata (=> in the
repository pattern we prefer to fetch the count explicitly if we need
pagination metadata)
- Added E2E tests for public recommendations API (content API)
- Extended E2E tests of admin recommendations API
### Portal
- Corrected recommendations always loaded in Portal. Instead they are
now only fetched when the recommendations page is opened.
### Admin-X
- Added `usePagination` hook: internally used in the new
`usePaginatedQuery` hook. This automatically adds working pagination to
a query that can be used to display in a table by passing the
`pagination` and `isLoading` results to the `<Table>`
- Added placeholder `<LoadingIndicator>` component
- Added a loading indicator to `<Table>`. This remembers the previous
height of the table, to avoid layout jumps when going to the next page.
refs https://github.com/TryGhost/Product/issues/3819
- Wired up embeddable signup form to admin x.
- minus the colour picker, to add in the next commit.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 9a3f1b9</samp>
This pull request introduces a new feature that allows users to embed a
signup form for their blog site on other websites. It adds a new
component `EmbedSignupFormModal` that renders a modal with form
customization and code copying options. It also updates the `Config`
type and the `config.ts` file to store and access the necessary data for
the embed code generation.
refs https://github.com/TryGhost/Product/issues/3832
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 3a37838</samp>
This pull request refactors the color settings in the site design and
branding section of the admin settings app to use a reusable
`ColorPickerField` component. This improves the UI consistency, user
experience, and code readability.
refs https://github.com/TryGhost/Product/issues/3809
When an input is added to a custom sign-up form with the attribute
`data-members-newsletter`, the value of the input will be used as the
newsletter to subscribe the member to.
refs https://github.com/TryGhost/Product/issues/3770
- Site is not always defined, so the things broke when using the signup action without a defined site, where it wants to read the recommendations_enabled setting
- Fixed this by removing the welcome page and looking for the existing query params instead
fixes https://github.com/TryGhost/Product/issues/3820
- This adds a new public site endpoint in the members API to check if a
site can offer the one-click-subscribe feature
- This is implemented on the members API as a copy of the `site`
endpoint because the admin API site endpoint is protected by CORS and
mainly because it can be served on a different domain than the
recommended site and this is hard to detect reliably from the frontend
- Added a new calculated setting `allow_self_signup`, which can replace
the setting that is currently used in Portal (best to do this after a
release otherwise we risk creating issues if a patch release happens)
refs https://github.com/TryGhost/Product/issues/3807
- Added announcement bar customisation to Admin X
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 91368ce</samp>
This pull request enhances the `AnnouncementBarModal` component to
enable users to customize the announcement bar on their site. It adds
editing and previewing features, as well as API integration and toast
notifications.
refs https://github.com/TryGhost/Product/issues/3815
- recommendations are rendered in a random order, using Fisher-Yates
shuffle
- only 5 recommendations are rendered by default, the other ones are
hidden behind a "Show all" button
- recommendations are fetched all at once from the backend, as we assume
there won't be more than 100-ish recommendations per publication
refs https://github.com/TryGhost/Product/issues/3771
- if recommendations are enabled, render the recommendation modal on
sign up, in Portal
- for free signups, the recommendations modal is rendered after clicking
on the magic link
- for paid signups, the recommendations modal is rendered after Stripe
Checkout
- the recommendations modal is not rendered on a free to paid upgrade
refs https://github.com/TryGhost/Product/issues/3745
---
This pull request adds a new feature to the `admin-x-settings` app that
allows users to customize the colors of their email newsletters. It also
simplifies and refactors the routing logic and the components related to
integrations, newsletters, and users. It introduces new dependencies and
components for color manipulation and selection, and updates the
existing components and stories to use them.
refs https://github.com/TryGhost/Product/issues/3349https://ghost.slack.com/archives/C0568LN2CGJ/p1693556448443489
- fixes an issue that's caused an infinite loop in the Portal design modal and stressing the CPU.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at ac33e3e</samp>
Refactors error handling logic for signup options form fields in
`SignupOptions.tsx` using `useCallback` and `useEffect` hooks. This
enhances the code quality and efficiency.
no issue
- Also fixes a backend issue with nullable fields
- Fixes blurring the url input and setting the value to '/'
automatically while we expect absolute urls
- Added autoFocus to inputs
refs https://github.com/TryGhost/Product/issues/3349
---
This pull request improves the end-to-end tests for the code injection
settings in the admin-x-settings app. It fixes some typing and saving
issues with the `CodeMirror` editor.
refs https://github.com/TryGhost/Product/issues/3745
---
This pull request adds a storybook file for the `CurrencyField`
component and changes its value prop to use cents instead of a string.
This improves the component's usability and consistency.
no issue
Previously the beta editor only worked for newly created posts/pages, any older content would open with the original editor. This change enables automatic conversion of old content to the new content format when a post/page is opened in the admin interface allowing new features like signup and advanced header cards to be used on existing content.
- removed `convertToLexical` feature flag
- where necessary switched to using just the `lexicalEditor` feature flag in its place
- moved the "L"/"M" indicators on the posts list to a new `lexicalIndicators` feature flag to make debugging/development easier
- added a redirect to the original editor route so that any route to opening the editor (such as the `/edit` front-end shortcut, or other areas of Admin) will open in the beta editor
- avoids confusing/inconsistent behavior
refs https://github.com/TryGhost/Product/issues/3745
---
Added a user setting for webmention notifications in the admin panel.
This allows users to opt in or out of receiving notifications when they
are mentioned by other sites using webmentions.
refs https://github.com/TryGhost/Product/issues/3746
---
This pull request adds and improves features for the membership settings
app, especially for the tips or donations feature. It introduces a new
`CurrencyField` component and a `currency` module for handling currency
input and display. It also refactors and enhances some existing
components, hooks, and types for better user experience and code
quality. It affects files such as `TierDetailModal.tsx`,
`TipsOrDonations.tsx`, `useForm.ts`, and `currency.ts`.
refs https://github.com/TryGhost/Product/issues/3745
---
This pull request adds and refactors several components and hooks for
the labs and advanced settings in the admin app. It introduces feature
flags for alpha and beta features, and allows the user to upload and
download redirects, routes and content files.
refs https://github.com/TryGhost/Product/issues/3349
---
Improved user experience for editing user details in the admin settings.
Added `dirty` state to track and handle unsaved changes in the
`UserDetailModal` component.
refs https://github.com/TryGhost/Product/issues/3751
---
This pull request adds limit checks and upgrade prompts for various
features in the admin-x-settings app, such as staff, members,
newsletters, custom integrations, and custom themes. It uses a custom
hook called `useLimiter`, which relies on the `@tryghost/limit-service`
package and the host settings configuration data.
refs https://ghost.slack.com/archives/C0568LN2CGJ/p1692804385770949
- Analytics exports was previously retrieved on on page load instead of
on demand.
- This fixes that to ensure it gets fetched when the user hits the
download button.
- Renamed the file saving to `post-analytics.yyyy-mm-dd.csv`
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 2c96e78</samp>
Improved the export posts feature in the membership settings by fetching
the data only on demand and adding a date to the file name. Modified the
`usePostsExports` hook and the `exportPosts` function in
`Analytics.tsx`.
refs https://github.com/TryGhost/Product/issues/3504
- This adds support for translations, but doesn't yet translate every
possible string in the app.
- Only active if beta translations is enabled
fixes https://github.com/TryGhost/Product/issues/3753
The validation for the terms checkbox was being executed when the terms
checkbox was not being rendered. The validation checks needed to be
updated to account for if the checkbox was rendered or not. Basically
the same as this:
45a70a3f4c
refs https://github.com/TryGhost/Product/issues/3349
- When updating certain states, eg the branding colour using or a typing
in a text box, we want it display on the preview almost immediately.
However this comes with a drawback of sending a ton of requests to the
server.
- This fix adds debouncing which essentially adds a small delay of
500ms, to wait for the user to finish typing / selecting colour before
making a request.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 4e623ff</samp>
Improved the performance and user experience of the site description and
accent color settings by debouncing the backend updates. Added a
`debounce` utility function in `debounce.ts`.
refs https://github.com/TryGhost/Product/issues/3349
- Previously it detected members as being disabled altogether, which
wasn't the case.
- This resolves that by passing in a few extra required params to have
Portal loading properly
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at d3cccab</samp>
This pull request enhances the portal preview feature by adding new
parameters to the iframe URL for the portal settings and pricing tiers.
It also cleans up some code in `PortalFrame.tsx` for better readability
and type safety.
refs https://github.com/TryGhost/Product/issues/3729
This pull request improves the Slack integration settings by allowing
users to test the webhook URL and save the settings from a modal. It
also refactors the `SlackModal` component and adds a new API function
`useTestSlack` to handle the test message.
refs https://github.com/TryGhost/Product/issues/3349
- added a download handler for the analytics download button.
- wired up the download api endpoint
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 46054be</samp>
This pull request adds a feature to export post analytics as a csv file
from the membership analytics dashboard. It implements a new query hook,
a download function, and a response handler in the
`apps/admin-x-settings` app, and adds a test case for the feature.
refs https://github.com/TryGhost/Product/issues/3729
---
This pull request enhances the custom integrations feature in the
admin-x-settings app by adding accessibility and UI improvements to the
`Select` and `WebhookModal` components, refactoring the webhook and
integration types in the API module, and adding a new end-to-end test
file to verify the functionality using mocked API responses.
refs https://github.com/TryGhost/Product/issues/3349
- Adds an additional condition to set the 'default' mailgun base url in case it not need change, to prevent it from staying null in the database config, when setting the domain and api key.
- In other cases it will work as usual.
refs https://github.com/TryGhost/Product/issues/3504
- App component now uses React hooks intead of React class component
- App is now written in TypeScript
- All JavaScript is now removed from the Comments-UI project
- Removed `PopupNotification` because these were never displayed
- Removed `action` from AppContext (never used)
- Moved options parsing out of `index.ts` into a separate utility file,
similar to the signup-form
- Improved reliability of some editor tests by always waiting for the
editor to be focused (was not always the case) + added an utility method
for this
refs https://github.com/TryGhost/Product/issues/3729
- Wired up the Pintura Integration to AdminX.
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 4d33355</samp>
This pull request adds the ability to customize the Pintura image editor
with custom JS and CSS files in the advanced settings modal. It
introduces a new `files.ts` file in the `api` folder, which provides a
hook and a helper function for uploading and retrieving files. It also
modifies the `PinturaModal.tsx` component to use these functions and
display the settings.
refs. https://github.com/TryGhost/Product/issues/3349
- added static Preview button to Tips and Donations
- updated modal buttons in Design settigns, so it doesn't close on save
and easier to play around with various settings
refs TryGhost/Product#3743
- Users should be able to hide the free plan from Portal, which removes it as an option on the main portal /signup page
- However, they should still be able to use the /signup/free link to allow members to signup for the free plan. Currently if the free plan is hidden from portal, the /signup/free link renders the main /signup page, with only paid plans available.
- This PR fixes that by allowing the /signup/free link to work even if the free plan is hidden from portal, but only by directly accessing the /signup/free link
refs https://github.com/TryGhost/Product/issues/3504
- When you are logged in as an admin, but not as a member, no buttons
showed (discovered in new e2e tests)
- Added E2E tests for admin actions
refs: https://github.com/TryGhost/Product/issues/3729
- Wired up the FirstPromoter api to adminx
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at bacd8ec</samp>
This pull request refactors the `FirstPromoterModal` component to use
hooks and helper functions, and adds a new end-to-end test file to
verify its functionality. The purpose of these changes is to improve the
code quality and the user experience of the FirstPromoter integration
feature.
refs https://github.com/TryGhost/Product/issues/3729
- wired up api to the AMP integration on AdminX
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at 930d3b2</samp>
This file adds a modal component to the advanced settings page that
allows users to toggle and customize AMP integration for their site. It
uses the `settings` API and React hooks to handle the modal logic and
state.
closes https://github.com/TryGhost/Product/issues/3741
refs https://github.com/TryGhost/Product/issues/3729
- my first commit with some Admin X stuff! 🕺🏻
- Wired up the API to the Unsplash integration modal
---
<!-- Leave the line below if you'd like GitHub Copilot to generate a
summary from your commit -->
<!--
copilot:summary
-->
### <samp>🤖 Generated by Copilot at da09dd4</samp>
This pull request adds a toggle to the Unsplash modal in the advanced
settings to enable or disable the Unsplash integration. It also updates
the settings API hook to include the Unsplash setting in the query.
refs. https://github.com/TryGhost/Product/issues/3729
- added static setting group for Integrations in AdminX
- added static built-in integration modals with forms
- added static custom integration list
closes https://github.com/TryGhost/Product/issues/3661
- until now, Portal was not loaded if members were disabled. With the
introduction of Tips & Donations, signed-off readers can also make
payments, using the Portal link /#/portal/support.
- now, Portal is loaded when Tips & Donations are enabled, even if
Memberships are disabled
- depending on the member signup access, the top bar / trigger button
Portal buttons are hidden as before (signup/subscribe hidden if access is set to none, subscribe hidden if
access is set to invite-only)
- for any other signup / signin Portal links (e.g., added by the theme,
or added via a Post/Page), a new popup informs the reader when
Memberships are disabled: "Memberships unavailable, contact the site
owner for access".
no issue
- When clicking back button in the browser when on the checkout page,
will not open Stripe again
- Does not open Stripe checkout in peek and pop mode in Arc