Create wikis in a background process

* The form now points to start.php, which converts
  allowed POST data to environment variables and
  sends them to new.php
* The output is written to log files in log/*.html
  which are then polled by the JS for new content
  every second
* Logs are only deleted when the wiki is deleted,
  allowing for debugging and inspection by other
  users.

Fixes #399

deletewiki.sh

@@ -3,5 +3,7 @@ set -ex
 
 rm -rf $PATCHDEMO/wikis/$WIKI
 
+rm $PATCHDEMO/logs/$WIKI.html
+
 # delete database
 mysql -u patchdemo --password=patchdemo -e "DROP DATABASE IF EXISTS patchdemo_$WIKI";

includes.php

@@ -308,7 +308,17 @@ function shell( $cmd, array $env = [] ): ?string {
 	return $error ? null : $process->getOutput();
 }
 
+/**
+ * Can't be called from CLI, use delete_wiki_cli_safe
+ *
+ * @param string $wiki Wiki name
+ * @return int Error code
+ */
 function delete_wiki( string $wiki ): int {
+	return delete_wiki_cli_safe( $wiki, getServer() . getServerPath() );
+}
+
+function delete_wiki_cli_safe( string $wiki, string $serverUri ): int {
 	global $mysqli;
 
 	$wikiData = get_wiki_data( $wiki );
@@ -325,16 +335,12 @@ function delete_wiki( string $wiki ): int {
 	);
 
 	foreach ( $wikiData['announcedTasks'] as $task ) {
-		// TODO: Deduplicate server/serverPath with variables in new.php
-		$server = detectProtocol() . '://' . $_SERVER['HTTP_HOST'];
-		$serverPath = preg_replace( '`/[^/]*$`', '', $_SERVER['REQUEST_URI'] );
-
 		$creator = $wikiData['creator'];
 		post_phab_comment(
 			'T' . $task,
-			"Test wiki on [[ $server$serverPath | Patch demo ]] " . ( $creator ? ' by ' . $creator : '' ) . " using patch(es) linked to this task was **deleted**:\n" .
+			"Test wiki on [[ $serverUri | Patch demo ]] " . ( $creator ? ' by ' . $creator : '' ) . " using patch(es) linked to this task was **deleted**:\n" .
 			"\n" .
-			"~~[[ $server$serverPath/wikis/$wiki/w/ ]]~~"
+			"~~[[ $serverUri/wikis/$wiki/w/ ]]~~"
 		);
 	}
 
@@ -475,7 +481,14 @@ function get_repo_presets(): array {
 	return $presets;
 }
 
+function isCli(): bool {
+	return PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg';
+}
+
 function detectProtocol(): string {
+	if ( isCli() ) {
+		throw new Error( 'Can\'t access server variables from CLI.' );
+	}
 	// Copied from MediaWiki's WebRequest::detectProtocol
 	if (
 		( !empty( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] !== 'off' ) ||
@@ -490,6 +503,20 @@ function detectProtocol(): string {
 	}
 }
 
+function getServer(): string {
+	if ( isCli() ) {
+		throw new Error( 'Can\'t access server variables from CLI.' );
+	}
+	return detectProtocol() . '://' . $_SERVER['HTTP_HOST'];
+}
+
+function getServerPath(): string {
+	if ( isCli() ) {
+		throw new Error( 'Can\'t access server variables from CLI.' );
+	}
+	return preg_replace( '`/[^/]*$`', '', $_SERVER['REQUEST_URI'] );
+}
+
 function get_csrf_token(): string {
 	global $useOAuth;
 	if ( !$useOAuth ) {

index.php

@@ -56,7 +56,7 @@
 	echo new OOUI\FormLayout( [
 		'infusable' => true,
 		'method' => 'POST',
-		'action' => 'new.php',
+		'action' => 'start.php',
 		'id' => 'new-form',
 		'items' => [
 			new OOUI\FieldsetLayout( [
@@ -311,7 +311,10 @@
 		'<td data-label="Linked tasks" class="linkedTasks">' . $linkedTasks . '</td>' .
 		'<td data-label="Time" class="date">' . date( 'Y-m-d H:i:s', $wikiData[ 'created' ] ) . '</td>' .
 		( $useOAuth ? '<td data-label="Creator">' . ( $creator ? user_link( $creator ) : '?' ) . '</td>' : '' ) .
-		( $canAdmin ? '<td data-label="Time to create">' . ( $wikiData['timeToCreate'] ? $wikiData['timeToCreate'] . 's' : '' ) . '</td>' : '' ) .
+		( $canAdmin ?
+			'<td data-label="Time to create"><a href="start.php?wiki=' . $wiki . '">' . ( $wikiData['timeToCreate'] ? $wikiData['timeToCreate'] . 's' : '' ) . '</a></td>' :
+			''
+		) .
 		( $canDelete ?
 			'<td data-label="Actions"><a href="delete.php?wiki=' . $wiki . '">Delete</a></td>' :
 			'<!-- EMPTY ACTIONS -->'

js/start.js

@@ -0,0 +1,57 @@
+/* global OO, pd */
+( function () {
+	window.pd = window.pd || {};
+
+	pd.installProgressField = OO.ui.infuse(
+		document.getElementsByClassName( 'installProgressField' )[ 0 ]
+	);
+
+	pd.installProgressField.fieldWidget.pushPending();
+
+	pd.openWiki = OO.ui.infuse(
+		document.getElementsByClassName( 'openWiki' )[ 0 ]
+	);
+
+	pd.notify = function ( message, body ) {
+		if ( 'Notification' in window && +localStorage.getItem( 'patchdemo-notifications' ) ) {
+			// eslint-disable-next-line no-new
+			new Notification(
+				message,
+				{
+					icon: './images/favicon-32x32.png',
+					body: body
+				}
+			);
+		}
+	};
+
+	$( function () {
+		var log = '';
+		var offset = 0;
+		// eslint-disable-next-line no-jquery/no-global-selector
+		var $log = $( '.newWikiLog' );
+		function poll() {
+			$.get( 'log.php', {
+				wiki: pd.wiki,
+				offset: offset
+			} ).then( function ( result ) {
+				if ( result ) {
+					// result can be unbalanced HTML, so store it in
+					// a string and rewrite the whole thing each time
+					log += result;
+					$log.html( log );
+					offset += result.length;
+				}
+				if ( !pd.finished ) {
+					setTimeout( poll, 1000 );
+				}
+			} );
+		}
+
+		poll();
+
+		// Add wiki to URL so that page can be shared/reloaded
+		history.replaceState( null, '', 'start.php?wiki=' + pd.wiki );
+	} );
+
+}() );

log.php

@@ -0,0 +1,33 @@
+<?php
+
+$offset = $_GET['offset'];
+$wiki = $_GET['wiki'];
+
+if ( !preg_match( '/^[0-9a-f]{10,32}$/', $wiki ) ) {
+	die( 'Invalid wiki name.' );
+}
+
+$file = 'logs/' . $wiki . '.html';
+
+if ( file_exists( $file ) ) {
+	echo file_get_contents(
+		$file,
+		false,
+		null,
+		$offset
+	);
+} else {
+	// TODO: De-duplicate with new.php
+	$err = 'Log not found.';
+	echo $err;
+	$errJson = json_encode( $err );
+	echo <<<EOT
+		<script>
+			pd.installProgressField.fieldWidget.setDisabled( true );
+			pd.installProgressField.fieldWidget.popPending();
+			pd.installProgressField.setErrors( [ new OO.ui.HtmlSnippet( $errJson ) ] );
+			pd.notify( 'Your PatchDemo wiki failed to build', $errJson );
+			pd.finished = true;
+		</script>
+EOT;
+}