| 1 |
<?php |
| 2 |
/** |
| 3 |
* Desktop Mode — `/desktop-mode` Portal Entry Point. |
| 4 |
* |
| 5 |
* Registers `/desktop-mode` as a shareable URL that behaves like the |
| 6 |
* front door of the desktop UI: |
| 7 |
* 1. Logged-out users are bounced through `wp-login.php` with a |
| 8 |
* redirect back to `/desktop-mode/`. |
| 9 |
* 2. Logged-in users with basic admin-read capability have the |
| 10 |
* `desktop_mode_mode` user-meta toggle auto-enabled on first visit, |
| 11 |
* then are forwarded into `wp-admin` at whichever window was |
| 12 |
* last focused in their saved session (or the dashboard as |
| 13 |
* fallback). |
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* |
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* The URL is served virtually (no rewrite rules, no `.htaccess` |
| 16 |
* surgery) by intercepting `parse_request` before WordPress routes the |
| 17 |
* URL to 404. This keeps the plugin drop-in. |
| 18 |
* |
| 19 |
* @package WPDesktopMode |
| 20 |
*/ |
| 21 |
|
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defined( 'ABSPATH' ) || exit; |
| 23 |
|
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/** The URL path that triggers the portal handler. */ |
| 25 |
const DESKTOP_MODE_PORTAL_PATH = 'desktop-mode'; |
| 26 |
|
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/** Query var the admin shell reads to know it was entered via the portal. */ |
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const DESKTOP_MODE_PORTAL_FLAG = 'desktop_mode_portal'; |
| 29 |
|
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/** |
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* Query var set on portal redirects whose landing page came from an |
| 32 |
* explicit `?target=…` URL the user (or a redirect chain originating |
| 33 |
* from a click) provided — as opposed to the portal picking the |
| 34 |
* session's focused window or the default-window fallback. |
| 35 |
* |
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* The shell uses this to distinguish "user expressed navigation intent |
| 37 |
* toward this URL" (open it) from "portal had to forward somewhere" |
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* (don't disturb the restored session). |
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*/ |
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const DESKTOP_MODE_PORTAL_INTENT_FLAG = 'desktop_mode_portal_intent'; |
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|
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/** |
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* Query var set by the window-title-bar "Detach" action. Tells the |
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* admin_init redirect to skip portal forwarding for this request so the |
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* user can view the page as classic wp-admin in a new tab even when |
| 46 |
* desktop mode is globally enabled for their account. |
| 47 |
*/ |
| 48 |
const DESKTOP_MODE_CLASSIC_FLAG = 'desktop_mode_classic'; |
| 49 |
|
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/** |
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* Returns the canonical portal URL, e.g. `https://example.com/desktop-mode/`. |
| 52 |
* |
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* @since 0.4.0 |
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* |
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* @return string |
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*/ |
| 57 |
function desktop_mode_portal_url() { |
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return home_url( '/' . DESKTOP_MODE_PORTAL_PATH . '/' ); |
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} |
| 60 |
|
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/** |
| 62 |
* Intercepts requests to `/desktop-mode` and forwards them into the admin. |
| 63 |
* |
| 64 |
* Hooks on `parse_request` — early enough to pre-empt 404 handling but |
| 65 |
* late enough that `is_user_logged_in()` is reliable. |
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* |
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* @since 0.4.0 |
| 68 |
* |
| 69 |
* @param WP $wp Current WordPress environment instance. |
| 70 |
*/ |
| 71 |
function desktop_mode_handle_portal_request( $wp ) { |
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unset( $wp ); |
| 73 |
|
| 74 |
if ( ! desktop_mode_is_portal_request() ) { |
| 75 |
return; |
| 76 |
} |
| 77 |
|
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// Logged-out: bounce through login, returning to the portal URL. |
| 79 |
if ( ! is_user_logged_in() ) { |
| 80 |
wp_safe_redirect( wp_login_url( desktop_mode_portal_url() ) ); |
| 81 |
exit; |
| 82 |
} |
| 83 |
|
| 84 |
// Require basic admin-read capability so subscribers of sites that |
| 85 |
// blocked `read` from admin don't land in a broken window. |
| 86 |
if ( ! current_user_can( 'read' ) ) { |
| 87 |
wp_die( |
| 88 |
esc_html__( 'Sorry, you are not allowed to access the WordPress desktop.', 'desktop-mode' ), |
| 89 |
'', |
| 90 |
array( 'response' => 403 ) |
| 91 |
); |
| 92 |
} |
| 93 |
|
| 94 |
$user_id = get_current_user_id(); |
| 95 |
|
| 96 |
/** |
| 97 |
* Filters whether visiting the `/desktop-mode` portal should auto-enable |
| 98 |
* desktop mode for the current user. |
| 99 |
* |
| 100 |
* Default: true — the portal is an explicit opt-in action, so flipping |
| 101 |
* the user meta mirrors the intent of visiting the URL. |
| 102 |
* |
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* @since 0.4.0 |
| 104 |
* |
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* @param bool $auto_enable Whether to auto-enable desktop mode. |
| 106 |
* @param int $user_id The current user's ID. |
| 107 |
*/ |
| 108 |
$auto_enable = apply_filters( 'desktop_mode_portal_auto_enable', true, $user_id ); |
| 109 |
|
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// CSRF guard: only flip user-meta when the request is a same-origin |
| 111 |
// top-level navigation. The portal is a GET URL by design (users |
| 112 |
// follow shared `/wp-desktop/` links), so we can't require a nonce |
| 113 |
// — but we can require that the navigation originated from the |
| 114 |
// same site (or a typed/bookmarked URL with no Referer/Sec-Fetch- |
| 115 |
// Site). Off-origin hits still redirect into admin so shared |
| 116 |
// links keep working; they just don't silently mutate user-meta. |
| 117 |
if ( $auto_enable && desktop_mode_portal_is_same_origin_navigation() && '1' !== get_user_meta( $user_id, 'desktop_mode_mode', true ) ) { |
| 118 |
update_user_meta( $user_id, 'desktop_mode_mode', '1' ); |
| 119 |
} |
| 120 |
|
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// Pick the landing page. Priority: |
| 122 |
// 1. Explicit `target` query arg, if same-origin wp-admin URL. |
| 123 |
// This is how `desktop_mode_redirect_plain_admin_to_portal` preserves |
| 124 |
// the user's navigation intent when they follow a link to a |
| 125 |
// specific admin page (e.g. profile.php). |
| 126 |
// 2. Last-focused window from the saved session. |
| 127 |
// 3. Dashboard fallback. |
| 128 |
$target = ''; |
| 129 |
$has_intent = false; |
| 130 |
if ( ! empty( $_GET['target'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 131 |
// `esc_url_raw`, NOT `sanitize_text_field`: the latter strips |
| 132 |
// every `%XX` percent-encoded sequence from its input as an XSS |
| 133 |
// safeguard, which mangles request URIs that legitimately carry |
| 134 |
// encoded slashes (e.g. `plugin=dir%2Ffile.php`). The downstream |
| 135 |
// `desktop_mode_sanitize_portal_target` validates the URL |
| 136 |
// rigorously (whitelist against the actual wp-admin directory, |
| 137 |
// scheme rejection, file_exists gate) so we don't lose any |
| 138 |
// real safety by skipping `sanitize_text_field` here. |
| 139 |
$target = desktop_mode_sanitize_portal_target( esc_url_raw( wp_unslash( $_GET['target'] ) ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 140 |
if ( '' !== $target ) { |
| 141 |
$has_intent = true; |
| 142 |
} |
| 143 |
} |
| 144 |
if ( '' === $target ) { |
| 145 |
$target = desktop_mode_portal_entry_url( $user_id ); |
| 146 |
} |
| 147 |
|
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// Flag the forward so the shell can stamp the address bar back to |
| 149 |
// /desktop-mode/ via history.replaceState once it has loaded. |
| 150 |
$target = add_query_arg( DESKTOP_MODE_PORTAL_FLAG, '1', $target ); |
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|
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// Second flag: the redirect resolved from an explicit `target`, so |
| 153 |
// the shell should treat the resulting `currentPage` as user |
| 154 |
// intent and auto-open it on top of the restored session. Without |
| 155 |
// this, a bare `/desktop-mode/` visit and a portal-redirected |
| 156 |
// admin-bar click would be indistinguishable downstream. |
| 157 |
if ( $has_intent ) { |
| 158 |
$target = add_query_arg( DESKTOP_MODE_PORTAL_INTENT_FLAG, '1', $target ); |
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} |
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|
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wp_safe_redirect( $target ); |
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exit; |
| 163 |
} |
| 164 |
add_action( 'parse_request', 'desktop_mode_handle_portal_request' ); |
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|
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/** |
| 167 |
* Decides whether the current request to the portal can mutate |
| 168 |
* user-meta safely (same-origin) or should only redirect (cross- |
| 169 |
* origin, possibly CSRF). |
| 170 |
* |
| 171 |
* Logic mirrors the `Sec-Fetch-Site` heuristic browsers use: |
| 172 |
* |
| 173 |
* - `Sec-Fetch-Site: same-origin | same-site | none` → trusted |
| 174 |
* (the request originated from this site, or from a typed URL |
| 175 |
* / bookmark with no referrer info). |
| 176 |
* - `Sec-Fetch-Site: cross-site` → untrusted (a third-party page |
| 177 |
* pointed the user at the portal — could be an `<img>` tag). |
| 178 |
* - Header missing (older browsers): fall back to `Referer` — |
| 179 |
* same host or empty referrer is trusted, anything else isn't. |
| 180 |
* |
| 181 |
* @since 0.6.2 |
| 182 |
* |
| 183 |
* @return bool |
| 184 |
*/ |
| 185 |
function desktop_mode_portal_is_same_origin_navigation() { |
| 186 |
if ( ! empty( $_SERVER['HTTP_SEC_FETCH_SITE'] ) ) { |
| 187 |
$site = strtolower( sanitize_text_field( wp_unslash( $_SERVER['HTTP_SEC_FETCH_SITE'] ) ) ); |
| 188 |
return in_array( $site, array( 'same-origin', 'same-site', 'none' ), true ); |
| 189 |
} |
| 190 |
|
| 191 |
if ( empty( $_SERVER['HTTP_REFERER'] ) ) { |
| 192 |
return true; |
| 193 |
} |
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|
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$referer_host = wp_parse_url( esc_url_raw( wp_unslash( $_SERVER['HTTP_REFERER'] ) ), PHP_URL_HOST ); |
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$home_host = wp_parse_url( home_url(), PHP_URL_HOST ); |
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|
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if ( ! is_string( $referer_host ) || '' === $referer_host ) { |
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return true; |
| 200 |
} |
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|
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return is_string( $home_host ) && strtolower( $referer_host ) === strtolower( $home_host ); |
| 203 |
} |
| 204 |
|
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/** |
| 206 |
* Detects whether the current request is for the portal URL. |
| 207 |
* |
| 208 |
* Strips any query string and trailing slash and compares against |
| 209 |
* `/desktop-mode` relative to the site's home path. |
| 210 |
* |
| 211 |
* @since 0.4.0 |
| 212 |
* |
| 213 |
* @return bool |
| 214 |
*/ |
| 215 |
function desktop_mode_is_portal_request() { |
| 216 |
if ( empty( $_SERVER['REQUEST_URI'] ) ) { |
| 217 |
return false; |
| 218 |
} |
| 219 |
|
| 220 |
// `esc_url_raw` instead of `sanitize_text_field` so percent-encoded |
| 221 |
// chars in the URI (notably `%2F` from query-arg slashes) survive |
| 222 |
// long enough for `wp_parse_url` to split path / query correctly. |
| 223 |
$uri = esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ); |
| 224 |
$path = wp_parse_url( $uri, PHP_URL_PATH ); |
| 225 |
if ( ! is_string( $path ) ) { |
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return false; |
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} |
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|
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$home_path = wp_parse_url( home_url( '/' ), PHP_URL_PATH ); |
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$home_path = is_string( $home_path ) ? rtrim( $home_path, '/' ) : ''; |
| 231 |
|
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$expected = $home_path . '/' . DESKTOP_MODE_PORTAL_PATH; |
| 233 |
$path = '/' . ltrim( rtrim( $path, '/' ), '/' ); |
| 234 |
|
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return $path === $expected; |
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} |
| 237 |
|
| 238 |
/** |
| 239 |
* Forwards plain `/wp-admin/...` requests to the `/desktop-mode/` portal |
| 240 |
* when the current user has desktop mode enabled. |
| 241 |
* |
| 242 |
* Why: when desktop mode is on, `/desktop-mode/` is meant to be the one |
| 243 |
* canonical address. A user who bookmarks `/wp-admin/plugins.php` or |
| 244 |
* follows an old admin link should still land in the shell, not in |
| 245 |
* vanilla admin with the shell glued over the top. Running through the |
| 246 |
* portal unifies the address bar and honors the saved session's focused |
| 247 |
* window. |
| 248 |
* |
| 249 |
* Narrowly scoped to bail on every automated or sub-request entry point |
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* — AJAX, REST, cron, admin-post.php, non-GET methods — so the hook |
| 251 |
* can't corrupt a form submission or break an API call. |
| 252 |
* |
| 253 |
* Disable via the `desktop_mode_admin_redirect_to_portal` filter (return |
| 254 |
* false). Passthrough kicks in automatically when the current request |
| 255 |
* is chromeless or already carries the portal flag. |
| 256 |
* |
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* @since 0.4.0 |
| 258 |
*/ |
| 259 |
function desktop_mode_redirect_plain_admin_to_portal() { |
| 260 |
if ( ! desktop_mode_is_enabled() ) { |
| 261 |
return; |
| 262 |
} |
| 263 |
if ( desktop_mode_is_chromeless_request() ) { |
| 264 |
return; |
| 265 |
} |
| 266 |
if ( wp_doing_ajax() || wp_doing_cron() ) { |
| 267 |
return; |
| 268 |
} |
| 269 |
if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) { |
| 270 |
return; |
| 271 |
} |
| 272 |
if ( ! empty( $_SERVER['REQUEST_METHOD'] ) && 'GET' !== strtoupper( sanitize_text_field( wp_unslash( $_SERVER['REQUEST_METHOD'] ) ) ) ) { |
| 273 |
return; |
| 274 |
} |
| 275 |
|
| 276 |
// The portal handler adds this flag after it forwards into admin. |
| 277 |
// Bailing here keeps us out of an infinite redirect loop. |
| 278 |
if ( ! empty( $_GET[ DESKTOP_MODE_PORTAL_FLAG ] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 279 |
return; |
| 280 |
} |
| 281 |
|
| 282 |
// The "Detach to new tab" button tags its URL with this flag so the |
| 283 |
// user can view one admin page classically without disabling desktop |
| 284 |
// mode account-wide. Only affects the single request — subsequent |
| 285 |
// navigations inside the tab lose the flag and follow normal rules. |
| 286 |
if ( ! empty( $_GET[ DESKTOP_MODE_CLASSIC_FLAG ] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 287 |
return; |
| 288 |
} |
| 289 |
|
| 290 |
// admin-post.php and admin-ajax.php handle form submissions and JSON |
| 291 |
// endpoints; redirecting them would break the call. |
| 292 |
global $pagenow; |
| 293 |
if ( in_array( $pagenow, array( 'admin-post.php', 'admin-ajax.php' ), true ) ) { |
| 294 |
return; |
| 295 |
} |
| 296 |
|
| 297 |
/** |
| 298 |
* Filters whether plain admin URLs should redirect to the portal |
| 299 |
* when desktop mode is active. |
| 300 |
* |
| 301 |
* @since 0.4.0 |
| 302 |
* |
| 303 |
* @param bool $redirect Whether to redirect. Default true. |
| 304 |
* @param int $user_id The current user's ID. |
| 305 |
*/ |
| 306 |
$redirect = apply_filters( 'desktop_mode_admin_redirect_to_portal', true, get_current_user_id() ); |
| 307 |
if ( ! $redirect ) { |
| 308 |
return; |
| 309 |
} |
| 310 |
|
| 311 |
// Preserve the original target on the portal redirect. Without this, |
| 312 |
// navigating to a specific admin page (profile.php, plugins.php, any |
| 313 |
// deep link) loses the user's intent — the portal would forward them |
| 314 |
// to whichever window was last focused instead of the page they asked |
| 315 |
// for. The portal handler reads `target`, validates it's same-origin |
| 316 |
// wp-admin, and uses it as the entry URL. |
| 317 |
$portal_url = desktop_mode_portal_url(); |
| 318 |
// `esc_url_raw` instead of `sanitize_text_field`: the latter strips |
| 319 |
// every `%XX` percent-encoded sequence, which corrupts URIs whose |
| 320 |
// query string legitimately carries an encoded slash — e.g. WP's |
| 321 |
// own `plugins.php?action=activate&plugin=dir%2Ffile.php` activate |
| 322 |
// link. The portal handler will validate this target downstream. |
| 323 |
$target = isset( $_SERVER['REQUEST_URI'] ) ? esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : ''; |
| 324 |
if ( is_string( $target ) && '' !== $target ) { |
| 325 |
$portal_url = add_query_arg( 'target', rawurlencode( $target ), $portal_url ); |
| 326 |
} |
| 327 |
|
| 328 |
wp_safe_redirect( $portal_url ); |
| 329 |
exit; |
| 330 |
} |
| 331 |
add_action( 'admin_init', 'desktop_mode_redirect_plain_admin_to_portal' ); |
| 332 |
|
| 333 |
/** |
| 334 |
* Resolves the admin URL the portal should forward to for a given user. |
| 335 |
* |
| 336 |
* Looks up the user's session and returns the URL of the window flagged |
| 337 |
* as `focused`. If the session is empty, has no focused window, or the |
| 338 |
* focused window's URL isn't same-origin admin, falls back to the |
| 339 |
* dashboard. |
| 340 |
* |
| 341 |
* The portal navigates the TOP window, not an iframe, so any chromeless |
| 342 |
* `desktop_mode_chromeless=1` flag baked into the stored URL is stripped — a leftover |
| 343 |
* flag would land the user in a standalone chromeless page (no admin |
| 344 |
* bar, no toggle, no way out) instead of the shell. |
| 345 |
* |
| 346 |
* @since 0.4.0 |
| 347 |
* |
| 348 |
* @param int $user_id The user whose session to consult. |
| 349 |
* @return string The admin URL to redirect to. |
| 350 |
*/ |
| 351 |
function desktop_mode_portal_entry_url( $user_id ) { |
| 352 |
$session = desktop_mode_get_session( $user_id ); |
| 353 |
|
| 354 |
// User's configured default-window preference. When disabled, we |
| 355 |
// still have to forward SOMEWHERE (the portal is an HTTP redirect), |
| 356 |
// so we land on the Dashboard URL — but the shell detects the |
| 357 |
// `enabled=false` state via the config and skips the auto-open, |
| 358 |
// leaving the user with an empty desktop as they chose. |
| 359 |
$default_window = desktop_mode_get_default_window( $user_id ); |
| 360 |
$fallback = $default_window['url']; |
| 361 |
|
| 362 |
// Native marker (e.g. "native:desktop-mode-os-settings") is not a |
| 363 |
// redirectable URL. The portal MUST forward somewhere — the |
| 364 |
// redirect happens at HTTP level — so we land on the admin home |
| 365 |
// and let the shell pick up `defaultWindow.url` from the config |
| 366 |
// after init and call nativeWindows.openById( <slug> ). |
| 367 |
if ( is_string( $fallback ) && 0 === strpos( $fallback, 'native:' ) ) { |
| 368 |
$fallback = admin_url(); |
| 369 |
} |
| 370 |
|
| 371 |
if ( empty( $session['focused'] ) || empty( $session['windows'] ) ) { |
| 372 |
return $fallback; |
| 373 |
} |
| 374 |
|
| 375 |
foreach ( $session['windows'] as $win ) { |
| 376 |
if ( ! isset( $win['id'], $win['url'] ) ) { |
| 377 |
continue; |
| 378 |
} |
| 379 |
if ( $win['id'] !== $session['focused'] ) { |
| 380 |
continue; |
| 381 |
} |
| 382 |
if ( ! desktop_mode_url_is_same_admin( $win['url'] ) ) { |
| 383 |
return $fallback; |
| 384 |
} |
| 385 |
return remove_query_arg( array( 'desktop_mode_chromeless', DESKTOP_MODE_PORTAL_FLAG ), $win['url'] ); |
| 386 |
} |
| 387 |
|
| 388 |
return $fallback; |
| 389 |
} |
| 390 |
|
| 391 |
/** |
| 392 |
* Validates and normalizes a `target` query arg on the portal URL. |
| 393 |
* |
| 394 |
* Accepts a raw request-URI-shaped string (path + optional query, e.g. |
| 395 |
* `/wp-admin/profile.php?foo=bar`) and returns a fully-qualified admin |
| 396 |
* URL if — and only if — it resolves to a same-origin `wp-admin/` path. |
| 397 |
* Everything else returns an empty string so the caller falls back to |
| 398 |
* the saved-session entry URL. |
| 399 |
* |
| 400 |
* Strips `desktop_mode_chromeless` and the portal flag from the query so the target |
| 401 |
* doesn't chain us into a chromeless standalone load or an infinite |
| 402 |
* redirect loop. |
| 403 |
* |
| 404 |
* @since 0.6.0 |
| 405 |
* |
| 406 |
* @param string $raw Raw value from `$_GET['target']` (already unslashed). |
| 407 |
* @return string A safe absolute admin URL, or '' if the input is invalid. |
| 408 |
*/ |
| 409 |
function desktop_mode_sanitize_portal_target( $raw ) { |
| 410 |
if ( ! is_string( $raw ) || '' === $raw ) { |
| 411 |
return ''; |
| 412 |
} |
| 413 |
|
| 414 |
// Reject URIs with a scheme or protocol-relative prefix — we only |
| 415 |
// accept relative paths so there's no way to redirect off-site. |
| 416 |
if ( preg_match( '#^([a-z][a-z0-9+.-]*:|//)#i', $raw ) ) { |
| 417 |
return ''; |
| 418 |
} |
| 419 |
|
| 420 |
// Must be an absolute path starting with /. |
| 421 |
if ( '/' !== $raw[0] ) { |
| 422 |
return ''; |
| 423 |
} |
| 424 |
|
| 425 |
$path = wp_parse_url( $raw, PHP_URL_PATH ); |
| 426 |
$query = wp_parse_url( $raw, PHP_URL_QUERY ); |
| 427 |
if ( ! is_string( $path ) || '' === $path ) { |
| 428 |
return ''; |
| 429 |
} |
| 430 |
|
| 431 |
$admin_path = wp_parse_url( admin_url(), PHP_URL_PATH ); |
| 432 |
$admin_path = is_string( $admin_path ) ? $admin_path : '/wp-admin/'; |
| 433 |
if ( 0 !== strpos( $path, $admin_path ) ) { |
| 434 |
return ''; |
| 435 |
} |
| 436 |
|
| 437 |
$file = substr( $path, strlen( $admin_path ) ); |
| 438 |
$file = ltrim( (string) $file, '/' ); |
| 439 |
if ( '' === $file ) { |
| 440 |
$file = 'index.php'; |
| 441 |
} |
| 442 |
|
| 443 |
// Resolve + whitelist against the actual wp-admin directory. A |
| 444 |
// regex alone would accept a plausible-looking filename that |
| 445 |
// doesn't exist (e.g. `custom_admin_page.php`) and effectively |
| 446 |
// become an open redirect to a 404 page served under the admin |
| 447 |
// path; the file_exists gate closes that. |
| 448 |
$target = desktop_mode_resolve_admin_target( $file ); |
| 449 |
if ( is_wp_error( $target ) ) { |
| 450 |
return ''; |
| 451 |
} |
| 452 |
|
| 453 |
if ( is_string( $query ) && '' !== $query ) { |
| 454 |
parse_str( $query, $args ); |
| 455 |
unset( $args['desktop_mode_chromeless'], $args[ DESKTOP_MODE_PORTAL_FLAG ], $args[ DESKTOP_MODE_PORTAL_INTENT_FLAG ], $args['target'] ); |
| 456 |
if ( ! empty( $args ) ) { |
| 457 |
$target = add_query_arg( $args, $target ); |
| 458 |
} |
| 459 |
} |
| 460 |
|
| 461 |
return $target; |
| 462 |
} |
| 463 |
|
