实现报销材料连续预览（07-27-yang-jun-reimbursement-readiness）

server/src/routes/invoicePool/read.js

@@ -8,6 +8,7 @@ const { buildAttachmentContentDisposition } = require("../../utils/contentDispos
 const { openReadStream, StorageNotFoundError } = require("../../services/storage");
 const { toMoneyString } = require("../../utils/workflow");
 const { resolveInvoiceAvailability } = require("../../services/invoiceGovernance");
+const { mapInvoiceDocumentMeta } = require("../../services/invoiceDocumentMeta");
 const {
   mapInvoiceSummary,
   normalizeInvoiceResponse,
@@ -201,11 +202,13 @@ function registerInvoicePoolReadRoutes(fastify) {
           invoice_number: true,
           invoice_date: true,
           seller_name: true,
+          buyer_name: true,
           total_amount: true,
           original_name: true,
           ocr_attempts: true,
           ocr_last_error: true,
           ocr_completed_at: true,
+          ocr_result: { select: { result_json: true } },
           updated_at: true,
           linked_reimbursement: {
             select: {
@@ -221,6 +224,7 @@ function registerInvoicePoolReadRoutes(fastify) {
         items: readableRows.map((invoice) => {
           const statusReason = resolveInvoiceStatusReason(invoice);
           return {
+            ...mapInvoiceDocumentMeta(invoice),
             id: invoice.id,
             status: invoice.status,
             reason: statusReason.reason,
@@ -231,6 +235,7 @@ function registerInvoicePoolReadRoutes(fastify) {
             invoiceNumber: invoice.invoice_number ?? null,
             invoiceDate: invoice.invoice_date?.toISOString?.()?.slice(0, 10) ?? null,
             sellerName: invoice.seller_name ?? null,
+            buyerName: invoice.buyer_name ?? null,
             totalAmount: toMoneyString(invoice.total_amount),
             originalName: invoice.original_name ?? null,
             linkedReimbursementId: invoice.linked_reimbursement_id ?? null,
@@ -319,19 +324,23 @@ function registerInvoicePoolReadRoutes(fastify) {
           invoice_number: true,
           invoice_date: true,
           seller_name: true,
+          buyer_name: true,
           total_amount: true,
           original_name: true,
           created_at: true,
+          ocr_result: { select: { result_json: true } },
         },
       });
 
       return sendData(reply, request, {
         items: items.map((item) => ({
+          ...mapInvoiceDocumentMeta(item),
           id: item.id,
           invoiceCode: item.invoice_code ?? null,
           invoiceNumber: item.invoice_number ?? null,
           invoiceDate: item.invoice_date?.toISOString?.()?.slice(0, 10) ?? null,
           sellerName: item.seller_name ?? null,
+          buyerName: item.buyer_name ?? null,
           totalAmount: toMoneyString(item.total_amount),
           originalName: item.original_name ?? null,
           createdAt: item.created_at?.toISOString?.() ?? null,

server/src/routes/invoicePool/shared/mappers.js

@@ -1,5 +1,6 @@
 const { toMoneyString } = require("../../../utils/workflow");
 const { resolveInvoiceAvailability } = require("../../../services/invoiceGovernance");
+const { mapInvoiceDocumentMeta } = require("../../../services/invoiceDocumentMeta");
 
 function mapVerificationRecord(item) {
   if (!item) {
@@ -30,6 +31,7 @@ function mapInvoiceSummary(item) {
   const availability = resolveInvoiceAvailability(item);
 
   return {
+    ...mapInvoiceDocumentMeta(item),
     id: item.id,
     status: item.status,
     availabilityReason: availability.reason,
@@ -78,6 +80,7 @@ function normalizeInvoiceResponse(invoice) {
   const availability = resolveInvoiceAvailability(invoice);
 
   return {
+    ...mapInvoiceDocumentMeta(invoice),
     id: invoice.id,
     status: invoice.status,
     availabilityReason: availability.reason,

server/src/routes/invoicePool/shared/selects.js

@@ -49,6 +49,7 @@ function buildInvoiceSummarySelect() {
     created_at: true,
     updated_at: true,
     verification_records: buildLatestVerificationSelect(),
+    ocr_result: { select: { result_json: true } },
     owner_employee: {
       select: { id: true, employee_no: true, name: true },
     },
@@ -95,6 +96,7 @@ function buildInvoiceDetailSelect(options = {}) {
     created_at: true,
     updated_at: true,
     verification_records: buildLatestVerificationSelect(),
+    ocr_result: { select: { result_json: true } },
   };
 
   if (options.includeLinkedReimbursement) {

server/src/routes/reimbursements.js

@@ -22,6 +22,7 @@ const {
 const { NOTIFICATION_TYPES } = require("../constants/notificationTypes");
 const { sendNotificationEmailSafe } = require("../services/email");
 const { enqueueReimbursementJournalExport } = require("../services/integrations/erpJournal");
+const { mapInvoiceDocumentMeta } = require("../services/invoiceDocumentMeta");
 const { dispatchNotificationBatch, flushNotificationDispatchTasks } = require("../services/notificationDispatcher");
 const { FEATURE_FLAG_KEYS, evaluateFeatureFlag } = require("../services/featureFlags");
 const { ensureCutoverAllowed } = require("../services/cutover");
@@ -32,7 +33,11 @@ const {
   resolveEntityPrecheck,
 } = require("../services/feeControl");
 const { issueDocumentNumber } = require("../services/documentSequence");
-const { openReadStream, StorageNotFoundError, writeBuffer } = require("../services/storage");
+const { openReadStream, readFileBuffer, StorageNotFoundError, writeBuffer } = require("../services/storage");
+const {
+  MaterialPreviewError,
+  createReimbursementMaterialPreviewStore,
+} = require("../services/reimbursementMaterialPreview");
 const {
   ATTACHMENT_TYPE,
   DOWNLOAD_POLICY,
@@ -80,6 +85,8 @@ const REIMBURSEMENT_ATTACHMENT_DELETE_BODY_SCHEMA = z
 const REIMBURSEMENT_ATTACHMENT_PREVIEW_BODY_SCHEMA = z
   .object({ reason: z.string().trim().max(200).optional() })
   .strict();
+const REIMBURSEMENT_MATERIAL_PREVIEW_BODY_SCHEMA = REIMBURSEMENT_ATTACHMENT_PREVIEW_BODY_SCHEMA;
+const REIMBURSEMENT_MATERIAL_PREVIEW_PAGE_SCHEMA = z.coerce.number().int().min(0).max(39);
 
 function resolveSignedFileOrigin(config, request) {
   const configured = String(config.appOrigin ?? "")
@@ -94,6 +101,21 @@ function resolvePreviewUrlTtlMs(config) {
   return Math.min(configuredSeconds, 120) * 1000;
 }
 
+function throwMaterialPreviewAppError(error) {
+  if (error instanceof StorageNotFoundError) {
+    throw new AppError({ code: "SYS_404", message: "Not Found", statusCode: 404 });
+  }
+  if (!(error instanceof MaterialPreviewError)) {
+    throw error;
+  }
+  const limitError = /_limit$/.test(error.code);
+  throw new AppError({
+    code: limitError ? "VALID_001" : "MATERIAL_PREVIEW_001",
+    message: limitError ? "报销材料较多，暂时无法连续预览" : "部分材料暂时无法生成连续预览",
+    statusCode: limitError ? 409 : 422,
+  });
+}
+
 const REIMBURSEMENT_CREATE_BODY_SCHEMA = z
   .object({
     ownerEmployeeId: z.string().uuid().optional(),
@@ -1361,6 +1383,9 @@ async function finalizeReimbursementSubmitSideEffects({
 }
 
 async function reimbursementRoutes(fastify) {
+  const materialPreviewStore = fastify.reimbursementMaterialPreviewStore
+    ?? createReimbursementMaterialPreviewStore();
+
   fastify.post(
     "/reimbursements",
     {
@@ -2121,11 +2146,13 @@ async function reimbursementRoutes(fastify) {
               invoice_number: true,
               invoice_date: true,
               seller_name: true,
+              buyer_name: true,
               total_amount: true,
               original_name: true,
               mime_type: true,
               file_size: true,
               linked_item_id: true,
+              ocr_result: { select: { result_json: true } },
             },
           },
           workflow_instances: {
@@ -2291,12 +2318,14 @@ async function reimbursementRoutes(fastify) {
         attachments: reimbursement.attachments.map(mapReimbursementAttachment),
         budgetHint,
         invoices: reimbursement.invoice_pool_items.map((item) => ({
+          ...mapInvoiceDocumentMeta(item),
           id: item.id,
           status: item.status,
           invoiceCode: item.invoice_code,
           invoiceNumber: item.invoice_number,
           invoiceDate: item.invoice_date?.toISOString?.()?.slice(0, 10) ?? null,
           sellerName: item.seller_name ?? null,
+          buyerName: item.buyer_name ?? null,
           totalAmount: toMoneyString(item.total_amount),
           originalName: item.original_name ?? null,
           mimeType: item.mime_type ?? null,
@@ -2951,6 +2980,212 @@ async function reimbursementRoutes(fastify) {
     },
   );
 
+  fastify.post(
+    "/reimbursements/:id/materials/preview-bundle",
+    { preHandler: fastify.authenticate },
+    async (request, reply) => {
+      const reimbursementId = parseReimbursementId(request.params?.id);
+      const parsedBody = REIMBURSEMENT_MATERIAL_PREVIEW_BODY_SCHEMA.safeParse(request.body ?? {});
+      if (!parsedBody.success) {
+        throw new AppError({ code: "VALID_001", message: "参数校验失败", statusCode: 400 });
+      }
+
+      const reimbursement = await fastify.prisma.reimbursementForm.findUnique({
+        where: { id: reimbursementId },
+        select: {
+          id: true,
+          owner_id: true,
+          submitter_id: true,
+          invoice_pool_items: {
+            orderBy: [{ created_at: "asc" }, { id: "asc" }],
+            select: {
+              id: true,
+              storage_path: true,
+              mime_type: true,
+              file_size: true,
+            },
+          },
+          attachments: {
+            orderBy: [{ created_at: "asc" }, { id: "asc" }],
+            select: {
+              id: true,
+              storage_path: true,
+              mime_type: true,
+              file_size: true,
+              governance_status: true,
+              sensitivity_level: true,
+              attachment_type: true,
+              download_policy: true,
+            },
+          },
+        },
+      });
+      if (!reimbursement) {
+        throw new AppError({ code: "SYS_404", message: "Not Found", statusCode: 404 });
+      }
+      ensureOwnOrCanViewAll(fastify, request, reimbursement);
+
+      const reason = sanitizeDownloadReason(parsedBody.data.reason);
+      if (reimbursement.attachments.some((attachment) => requiresDownloadReason(attachment)) && !reason) {
+        throw new AppError({
+          code: "VALID_001",
+          message: "参数校验失败",
+          statusCode: 400,
+          details: { reason: "required" },
+        });
+      }
+
+      const materials = [
+        ...reimbursement.invoice_pool_items.map((invoice, index) => ({
+          id: invoice.id,
+          materialType: "invoice",
+          materialIndex: index + 1,
+          storagePath: invoice.storage_path,
+          mimeType: invoice.mime_type,
+          fileSize: invoice.file_size,
+        })),
+        ...reimbursement.attachments.map((attachment, index) => ({
+          id: attachment.id,
+          materialType: "attachment",
+          materialIndex: index + 1,
+          storagePath: attachment.storage_path,
+          mimeType: attachment.mime_type,
+          fileSize: attachment.file_size,
+        })),
+      ];
+      if (materials.some((material) => !ATTACHMENT_MIME_ALLOWLIST.has(material.mimeType))) {
+        throw new AppError({
+          code: "MATERIAL_PREVIEW_001",
+          message: "部分材料格式暂不支持连续预览",
+          statusCode: 422,
+        });
+      }
+
+      const expiresAt = Date.now() + resolvePreviewUrlTtlMs(fastify.config);
+      let created;
+      try {
+        created = await materialPreviewStore.createBundle({
+          actorId: request.employee.id,
+          reimbursementId,
+          materials,
+          expiresAt,
+          readSource: (material) => readFileBuffer({
+            config: fastify.config,
+            storagePath: material.storagePath,
+          }),
+        });
+      } catch (error) {
+        throwMaterialPreviewAppError(error);
+      }
+
+      const origin = resolveSignedFileOrigin(fastify.config, request);
+      const pages = created.bundle.pages.map((page, pageIndex) => {
+        const previewToken = signPayload({
+          purpose: "reimbursement_material_preview",
+          reimbursementId,
+          bundleId: created.bundleId,
+          pageIndex,
+          actorId: request.employee.id,
+          exp: expiresAt,
+        }, fastify.config.jwtSecret);
+        return {
+          url: `${origin}/api/reimbursements/${reimbursementId}/materials/preview/${created.bundleId}/${pageIndex}?previewToken=${encodeURIComponent(previewToken)}`,
+          materialType: page.materialType,
+          materialIndex: page.materialIndex,
+          pageNumber: page.pageNumber,
+        };
+      });
+
+      try {
+        await fastify.prisma.auditLog.create({
+          data: buildAuditLogData(request, {
+            actorId: request.employee.id,
+            action: "REIMBURSEMENT_MATERIAL_PREVIEW_BUNDLE_ISSUED",
+            targetType: "reimbursement",
+            targetId: reimbursementId,
+            extra: {
+              invoiceCount: reimbursement.invoice_pool_items.length,
+              attachmentCount: reimbursement.attachments.length,
+              pageCount: pages.length,
+              reason,
+              expiresAt,
+            },
+          }),
+        });
+      } catch (error) {
+        materialPreviewStore.deleteBundle?.(created.bundleId);
+        throw error;
+      }
+
+      return sendData(reply, request, {
+        expiresAt: new Date(expiresAt).toISOString(),
+        pages,
+      });
+    },
+  );
+
+  fastify.get(
+    "/reimbursements/:id/materials/preview/:bundleId/:pageIndex",
+    {},
+    async (request, reply) => {
+      const reimbursementId = parseReimbursementId(request.params?.id);
+      const parsedBundleId = UUID_SCHEMA.safeParse(request.params?.bundleId);
+      const parsedPageIndex = REIMBURSEMENT_MATERIAL_PREVIEW_PAGE_SCHEMA.safeParse(request.params?.pageIndex);
+      const previewToken = typeof request.query?.previewToken === "string" ? request.query.previewToken : "";
+      const verified = previewToken ? verifyToken(previewToken, fastify.config.jwtSecret) : { ok: false };
+      const payload = verified.ok ? verified.payload : null;
+      const parsedActorId = UUID_SCHEMA.safeParse(payload?.actorId);
+      if (
+        !parsedBundleId.success ||
+        !parsedPageIndex.success ||
+        !verified.ok ||
+        payload?.purpose !== "reimbursement_material_preview" ||
+        payload?.reimbursementId !== reimbursementId ||
+        payload?.bundleId !== parsedBundleId.data ||
+        payload?.pageIndex !== parsedPageIndex.data ||
+        typeof payload?.exp !== "number" ||
+        payload.exp <= Date.now() ||
+        !parsedActorId.success
+      ) {
+        throw new AppError({ code: "PERM_001", message: "无权限", statusCode: 403 });
+      }
+
+      const resolved = materialPreviewStore.getPage({
+        bundleId: parsedBundleId.data,
+        pageIndex: parsedPageIndex.data,
+      });
+      if (
+        !resolved ||
+        resolved.bundle.reimbursementId !== reimbursementId ||
+        resolved.bundle.actorId !== parsedActorId.data ||
+        resolved.bundle.expiresAt !== payload.exp
+      ) {
+        throw new AppError({ code: "PERM_001", message: "无权限", statusCode: 403 });
+      }
+
+      await fastify.prisma.auditLog.create({
+        data: buildAuditLogData(request, {
+          actorId: parsedActorId.data,
+          action: "REIMBURSEMENT_MATERIAL_PREVIEWED",
+          targetType: "reimbursement",
+          targetId: reimbursementId,
+          extra: {
+            materialId: resolved.page.materialId,
+            materialType: resolved.page.materialType,
+            materialIndex: resolved.page.materialIndex,
+            pageNumber: resolved.page.pageNumber,
+          },
+        }),
+      });
+
+      reply.type("image/png");
+      reply.header("cache-control", "private, no-store");
+      reply.header("referrer-policy", "no-referrer");
+      reply.header("content-disposition", "inline");
+      return reply.send(resolved.page.buffer);
+    },
+  );
+
   fastify.post(
     "/reimbursements/:id/items",
     {

server/src/services/invoiceDocumentMeta.js

@@ -0,0 +1,22 @@
+const SAFE_DOCUMENT_CATEGORIES = new Set([
+  "vat_invoice",
+  "full_vat_invoice",
+  "electronic_train_ticket",
+]);
+
+function normalizeSafeMetaString(value, maxLength = 64) {
+  if (typeof value !== "string") return null;
+  const normalized = value.trim();
+  return normalized ? normalized.slice(0, maxLength) : null;
+}
+
+function mapInvoiceDocumentMeta(invoice) {
+  const result = invoice?.ocr_result?.result_json;
+  const category = normalizeSafeMetaString(result?.documentCategory);
+  return {
+    documentCategory: SAFE_DOCUMENT_CATEGORIES.has(category) ? category : null,
+    documentSubtype: normalizeSafeMetaString(result?.documentSubtype),
+  };
+}
+
+module.exports = { mapInvoiceDocumentMeta };

server/src/services/reimbursementMaterialPreview.js

@@ -0,0 +1,210 @@
+const crypto = require("node:crypto");
+const fs = require("node:fs/promises");
+const os = require("node:os");
+const path = require("node:path");
+const { promisify } = require("node:util");
+const { execFile } = require("node:child_process");
+const sharp = require("sharp");
+
+const execFileAsync = promisify(execFile);
+
+const MATERIAL_PREVIEW_LIMITS = Object.freeze({
+  maxMaterials: 20,
+  maxSourceBytes: 50 * 1024 * 1024,
+  maxPages: 40,
+  maxPageWidth: 1800,
+  maxPagePixels: 40_000_000,
+  maxOutputBytes: 40 * 1024 * 1024,
+  maxCacheBytes: 80 * 1024 * 1024,
+  rasterDpi: 144,
+  rasterTimeoutMs: 20_000,
+});
+
+class MaterialPreviewError extends Error {
+  constructor(code) {
+    super(code);
+    this.name = "MaterialPreviewError";
+    this.code = code;
+  }
+}
+
+function pageNumberFromName(fileName) {
+  const matched = fileName.match(/-(\d+)\.png$/i);
+  return matched ? Number(matched[1]) : Number.MAX_SAFE_INTEGER;
+}
+
+async function normalizePreviewImage(buffer, limits = MATERIAL_PREVIEW_LIMITS) {
+  try {
+    return await sharp(buffer, { failOn: "error", limitInputPixels: limits.maxPagePixels })
+      .rotate()
+      .resize({ width: limits.maxPageWidth, withoutEnlargement: true })
+      .png({ compressionLevel: 8, adaptiveFiltering: true })
+      .toBuffer();
+  } catch {
+    throw new MaterialPreviewError("material_preview_image_invalid");
+  }
+}
+
+async function rasterizePdfWithPoppler(buffer, limits = MATERIAL_PREVIEW_LIMITS) {
+  const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "hyb-oa-material-preview-"));
+  const sourcePath = path.join(tempDir, "source.pdf");
+  const outputPrefix = path.join(tempDir, "page");
+
+  try {
+    await fs.writeFile(sourcePath, buffer, { flag: "wx" });
+    try {
+      await execFileAsync(
+        "pdftoppm",
+        [
+          "-png",
+          "-r",
+          String(limits.rasterDpi),
+          "-f",
+          "1",
+          "-l",
+          String(limits.maxPages + 1),
+          "-scale-to-x",
+          String(limits.maxPageWidth),
+          "-scale-to-y",
+          "-1",
+          sourcePath,
+          outputPrefix,
+        ],
+        {
+          timeout: limits.rasterTimeoutMs,
+          maxBuffer: 1024 * 1024,
+          windowsHide: true,
+        },
+      );
+    } catch (error) {
+      if (error?.code === "ENOENT") {
+        throw new MaterialPreviewError("material_preview_rasterizer_unavailable");
+      }
+      if (error?.killed || error?.signal) {
+        throw new MaterialPreviewError("material_preview_raster_timeout");
+      }
+      throw new MaterialPreviewError("material_preview_pdf_invalid");
+    }
+
+    const fileNames = (await fs.readdir(tempDir))
+      .filter((fileName) => /^page-\d+\.png$/i.test(fileName))
+      .sort((left, right) => pageNumberFromName(left) - pageNumberFromName(right));
+    if (!fileNames.length) {
+      throw new MaterialPreviewError("material_preview_pdf_empty");
+    }
+
+    const pages = [];
+    for (const fileName of fileNames) {
+      pages.push(await normalizePreviewImage(await fs.readFile(path.join(tempDir, fileName)), limits));
+    }
+    return pages;
+  } finally {
+    await fs.rm(tempDir, { recursive: true, force: true });
+  }
+}
+
+function createReimbursementMaterialPreviewStore(options = {}) {
+  const limits = { ...MATERIAL_PREVIEW_LIMITS, ...(options.limits ?? {}) };
+  const rasterizePdf = options.rasterizePdf ?? ((buffer) => rasterizePdfWithPoppler(buffer, limits));
+  const normalizeImage = options.normalizeImage ?? ((buffer) => normalizePreviewImage(buffer, limits));
+  const now = options.now ?? (() => Date.now());
+  const randomUUID = options.randomUUID ?? (() => crypto.randomUUID());
+  const bundles = new Map();
+  let cachedBytes = 0;
+
+  function deleteBundle(bundleId) {
+    const bundle = bundles.get(bundleId);
+    if (!bundle) return;
+    cachedBytes -= bundle.outputBytes;
+    bundles.delete(bundleId);
+  }
+
+  function pruneExpired() {
+    const current = now();
+    for (const [bundleId, bundle] of bundles) {
+      if (bundle.expiresAt <= current) deleteBundle(bundleId);
+    }
+  }
+
+  async function createBundle({ actorId, reimbursementId, materials, expiresAt, readSource }) {
+    pruneExpired();
+    if (!Array.isArray(materials) || materials.length === 0) {
+      throw new MaterialPreviewError("material_preview_empty");
+    }
+    if (materials.length > limits.maxMaterials) {
+      throw new MaterialPreviewError("material_preview_material_limit");
+    }
+    const sourceBytes = materials.reduce((sum, material) => sum + Number(material.fileSize ?? 0), 0);
+    if (!Number.isSafeInteger(sourceBytes) || sourceBytes <= 0 || sourceBytes > limits.maxSourceBytes) {
+      throw new MaterialPreviewError("material_preview_source_size_limit");
+    }
+
+    const pages = [];
+    let outputBytes = 0;
+    let actualSourceBytes = 0;
+    for (const material of materials) {
+      const source = await readSource(material);
+      if (!Buffer.isBuffer(source) || source.length === 0) {
+        throw new MaterialPreviewError("material_preview_source_missing");
+      }
+      actualSourceBytes += source.length;
+      if (actualSourceBytes > limits.maxSourceBytes) {
+        throw new MaterialPreviewError("material_preview_source_size_limit");
+      }
+      const renderedPages = material.mimeType === "application/pdf"
+        ? await rasterizePdf(source)
+        : [await normalizeImage(source)];
+      for (let index = 0; index < renderedPages.length; index += 1) {
+        if (pages.length >= limits.maxPages) {
+          throw new MaterialPreviewError("material_preview_page_limit");
+        }
+        const image = renderedPages[index];
+        outputBytes += image.length;
+        if (outputBytes > limits.maxOutputBytes) {
+          throw new MaterialPreviewError("material_preview_output_size_limit");
+        }
+        pages.push({
+          buffer: image,
+          materialId: material.id,
+          materialType: material.materialType,
+          materialIndex: material.materialIndex,
+          pageNumber: index + 1,
+        });
+      }
+    }
+
+    if (cachedBytes + outputBytes > limits.maxCacheBytes) {
+      pruneExpired();
+      if (cachedBytes + outputBytes > limits.maxCacheBytes) {
+        throw new MaterialPreviewError("material_preview_cache_limit");
+      }
+    }
+
+    const bundleId = randomUUID();
+    const bundle = { actorId, reimbursementId, expiresAt, outputBytes, pages };
+    bundles.set(bundleId, bundle);
+    cachedBytes += outputBytes;
+    const timer = setTimeout(() => deleteBundle(bundleId), Math.max(1, expiresAt - now()));
+    timer.unref?.();
+    return { bundleId, bundle };
+  }
+
+  function getPage({ bundleId, pageIndex }) {
+    pruneExpired();
+    const bundle = bundles.get(bundleId);
+    if (!bundle || !Number.isInteger(pageIndex) || pageIndex < 0 || pageIndex >= bundle.pages.length) {
+      return null;
+    }
+    return { bundle, page: bundle.pages[pageIndex] };
+  }
+
+  return { createBundle, getPage, deleteBundle };
+}
+
+module.exports = {
+  MATERIAL_PREVIEW_LIMITS,
+  MaterialPreviewError,
+  createReimbursementMaterialPreviewStore,
+  normalizePreviewImage,
+  rasterizePdfWithPoppler,
+};