Phase 0: per-user backup/restore through user_migration (spike E)

RepositoryExportDestination / RepositoryImportSource implement the public OCP\UserMigration interfaces on top of the repository, so user_migration's migrators (calendar, contacts, trashbin, account, files) export straight into the encrypted repository. Spike E (NC34): export 0.8s, unchanged second export stores nothing; after deleting the user, import restores account, files (bit-identical), calendar event and contact. Findings: calendars/address books come back as 'migrated-*' with new object URIs; importing over an existing user duplicates contacts and adds a migrated birthday calendar; creating the user on import needs >128 MB (password_policy word list).
2026-10-01 18:36:57 +02:00
parent b06ff0f89f
commit 6ee2b7e138
4 changed files with 369 additions and 0 deletions
@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+
+// SPDX-FileCopyrightText: 2026 Dillard Blom
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+namespace OCA\NgBackup\UserMigration;
+
+use OCA\NgBackup\Repository\Repository;
+use OCP\Files\File;
+use OCP\Files\Folder;
+use OCP\UserMigration\IExportDestination;
+
+/**
+ * Export destination for user_migration that writes straight into the encrypted repository:
+ * no zip, no copy in the user's folder. Every exported path becomes a blob stream; the list
+ * of paths is stored as one encrypted manifest (users/<uid>/<exportId>) when close() is called.
+ */
+final class RepositoryExportDestination implements IExportDestination {
+	/** @var array<string, array{t:string, b?:list<string>, s?:int}> path => entry */
+	private array $entries = [];
+	private array $versions = [];
+	private array $stats = ['newBlobs' => 0, 'dupBlobs' => 0, 'uploaded' => 0];
+	private string $exportId;
+
+	public function __construct(
+		private Repository $repo,
+		private string $uid,
+	) {
+		$this->exportId = gmdate('Ymd\THis\Z') . '-' . bin2hex(random_bytes(4));
+	}
+
+	public function addFileContents(string $path, string $content): void {
+		$writer = $this->repo->blobWriter($this->stats);
+		$writer->write($content);
+		$this->entries[self::norm($path)] = ['t' => 'f', 'b' => $writer->finish(), 's' => strlen($content)];
+	}
+
+	public function addFileAsStream(string $path, $stream): void {
+		$writer = $this->repo->blobWriter($this->stats);
+		while (!feof($stream)) {
+			$chunk = fread($stream, 1048576);
+			if ($chunk === false) {
+				break;
+			}
+			$writer->write($chunk);
+		}
+		$this->entries[self::norm($path)] = ['t' => 'f', 'b' => $writer->finish(), 's' => $writer->bytes()];
+	}
+
+	public function copyFolder(Folder $folder, string $destinationPath, ?callable $nodeFilter = null): void {
+		$base = self::norm($destinationPath);
+		$this->entries[$base] = ['t' => 'd'];
+		foreach ($folder->getDirectoryListing() as $node) {
+			if ($nodeFilter !== null && !$nodeFilter($node)) {
+				continue;
+			}
+			$target = $base . '/' . $node->getName();
+			if ($node instanceof Folder) {
+				$this->copyFolder($node, $target, $nodeFilter);
+			} elseif ($node instanceof File) {
+				$stream = $node->fopen('rb');
+				if ($stream === false) {
+					throw new \RuntimeException('Cannot read ' . $node->getPath());
+				}
+				$this->addFileAsStream($target, $stream);
+				fclose($stream);
+			}
+		}
+	}
+
+	public function setMigratorVersions(array $versions): void {
+		$this->versions = $versions;
+	}
+
+	public function close(): void {
+		$this->repo->flushPacks();
+		$manifest = ['uid' => $this->uid, 'time' => gmdate('c'), 'versions' => $this->versions, 'entries' => $this->entries];
+		$this->repo->putObject($this->manifestPath(), json_encode($manifest, JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR));
+	}
+
+	public function manifestPath(): string {
+		return 'users/' . $this->uid . '/' . $this->exportId;
+	}
+
+	public function stats(): array {
+		return $this->stats;
+	}
+
+	private static function norm(string $path): string {
+		return trim($path, '/');
+	}
+}
@@ -0,0 +1,120 @@
+<?php
+
+declare(strict_types=1);
+
+// SPDX-FileCopyrightText: 2026 Dillard Blom
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+namespace OCA\NgBackup\UserMigration;
+
+use OCA\NgBackup\Repository\Repository;
+use OCP\Files\Folder;
+use OCP\UserMigration\IImportSource;
+use OCP\UserMigration\UserMigrationException;
+
+/** Import source for user_migration that reads a user export from the repository. */
+final class RepositoryImportSource implements IImportSource {
+	private array $manifest;
+
+	public function __construct(
+		private Repository $repo,
+		string $manifestPath,
+	) {
+		$this->manifest = json_decode($repo->getObject($manifestPath), true, 512, JSON_THROW_ON_ERROR);
+	}
+
+	public function getFileContents(string $path): string {
+		$stream = $this->getFileAsStream($path);
+		$data = (string)stream_get_contents($stream);
+		fclose($stream);
+		return $data;
+	}
+
+	public function getFileAsStream(string $path) {
+		$entry = $this->entry($path, 'f');
+		// Phase 0: buffer in php://temp (memory up to 8 MiB, then a temp file for this one file).
+		$stream = fopen('php://temp/maxmemory:' . (8 * 1048576), 'w+b');
+		foreach ($this->repo->readBlobs($entry['b']) as $data) {
+			fwrite($stream, $data);
+		}
+		rewind($stream);
+		return $stream;
+	}
+
+	public function getFolderListing(string $path): array {
+		$prefix = trim($path, '/');
+		$prefix = $prefix === '' ? '' : $prefix . '/';
+		$names = [];
+		foreach (array_keys($this->manifest['entries']) as $p) {
+			if ($prefix === '' || str_starts_with($p, $prefix)) {
+				$rest = substr($p, strlen($prefix));
+				if ($rest !== '' && !str_contains($rest, '/')) {
+					$names[] = $rest;
+				}
+			}
+		}
+		sort($names);
+		return $names;
+	}
+
+	public function pathExists(string $path): bool {
+		$p = trim($path, '/');
+		if (isset($this->manifest['entries'][$p])) {
+			return true;
+		}
+		foreach (array_keys($this->manifest['entries']) as $k) {
+			if (str_starts_with($k, $p . '/')) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	public function copyToFolder(Folder $destination, string $sourcePath): void {
+		foreach ($this->getFolderListing($sourcePath) as $name) {
+			$path = trim($sourcePath, '/') . '/' . $name;
+			$entry = $this->manifest['entries'][$path] ?? ['t' => 'd'];
+			if ($entry['t'] === 'd') {
+				$sub = $destination->nodeExists($name) ? $destination->get($name) : $destination->newFolder($name);
+				if (!$sub instanceof Folder) {
+					throw new UserMigrationException("$path exists and is not a folder");
+				}
+				$this->copyToFolder($sub, $path);
+			} else {
+				$stream = $this->getFileAsStream($path);
+				if ($destination->nodeExists($name)) {
+					$destination->get($name)->putContent($stream);
+				} else {
+					$destination->newFile($name, $stream);
+				}
+				if (is_resource($stream)) {
+					fclose($stream);
+				}
+			}
+		}
+	}
+
+	public function getMigratorVersions(): array {
+		return $this->manifest['versions'];
+	}
+
+	public function getMigratorVersion(string $migrator): ?int {
+		return $this->manifest['versions'][$migrator] ?? null;
+	}
+
+	public function getOriginalUid(): string {
+		return $this->manifest['uid'];
+	}
+
+	public function close(): void {
+	}
+
+	/** @return array{t:string, b:list<string>, s:int} */
+	private function entry(string $path, string $type): array {
+		$entry = $this->manifest['entries'][trim($path, '/')] ?? null;
+		if ($entry === null || $entry['t'] !== $type) {
+			throw new UserMigrationException('Path not found in backup: ' . $path);
+		}
+		return $entry;
+	}
+}