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import { parseQuantity } from '@/helpers/quantity';
import { ProductBuilder } from '@/utils/ProductBuilder';
import { detectTermType } from '@/utils/search-query/detectTermType';
import {
isVWRAssetReferencesResponse,
isVWROrdertableResponse,
isVWRSearchResponse,
isVWRSpecificationResponse,
isVWRStockResponse,
isVWRSubstanceResponse,
isVWRTokenResponse,
} from '@/utils/typeGuards/vwr';
import { SupplierBase } from './SupplierBase';
import { getErrorMessage } from '@/helpers/exceptions';
/**
* SupplierVWR - supplier implementation for VWR (Avantor Sciences).
*
* @remarks
* VWR exposes an OCC (SAP Commerce) JSON API behind an OAuth `client_credentials` flow. A search
* is a two-phase operation: {@link queryProducts} authenticates, runs the product search, and
* fuzzy-ranks the raw results down to the top-N matches; {@link getProductData} then enriches only
* those survivors with the ordertable (variants/pricing/SDS), asset references (SDS + COA),
* chemical substance (CAS/formula/molecular weight), and a single batched stock-availability call.
* The product image comes from the search response, so no images call is made.
*
* @category Suppliers
* @source
*/
export class SupplierVWR extends SupplierBase<VWRSearchProduct, Product> implements ISupplier {
// Name of supplier (for display purposes)
public static readonly supplierName: string = 'VWR';
// Base URL for HTTP(s) requests (storefront; used for product links + referrer).
// Must be www.vwr.com — it's the storefront referrer and the host granted in the manifest.
public static readonly baseURL: string = 'https://www.vwr.com';
// Bare host for the OCC API (base builds `https://${apiURL}/*` for requiredHosts)
public static readonly apiURL: string = 'occapi.avantorsciences.com';
// Shipping scope
public static readonly shipping: ShippingRange = 'worldwide';
// The country code of the supplier.
public static readonly country: CountryCode = 'US';
// The payment methods accepted by the supplier.
public static readonly paymentMethods: PaymentMethod[] = ['mastercard', 'visa'];
// OAuth client id for the anonymous client_credentials grant.
private readonly clientId: string = 'VVjdGUHAb3ETZLEVTWtFy3BmhFhXSdBB';
// Cached bearer token and its absolute expiry (epoch ms).
private accessToken?: string;
private accessTokenExpiresAt?: number;
protected static readonly supportsCAS: boolean = true;
protected static readonly supportsFormula: boolean = true;
// Refresh the token this many ms before it actually expires.
private readonly tokenSafetyMarginMs: number = 30_000;
// Stop paginating after this many consecutive batches yield nothing post-filter.
private readonly maxEmptySearchBatches: number = 2;
// Raise the base per-search HTTP ceiling to accommodate paginated search + per-product detail calls.
protected readonly httpRequestHardLimit: number = 100;
// OCC API paths. All except the token endpoint carry the `/occ/v2/us.vwr.com` prefix;
// `assetReferences` is base-product specific so it's built on demand.
private readonly paths = {
token: '/authorizationserver/oauth/token',
search: '/occ/v2/us.vwr.com/products/search',
ordertable: '/occ/v2/us.vwr.com/api/product/ordertable',
substance: '/occ/v2/us.vwr.com/api/product/chemical/substance',
specification: '/occ/v2/us.vwr.com/api/product/chemical/specification',
stock: '/occ/v2/us.vwr.com/api/product/getAnonymousStockAvailability',
canonicalUrl: '/occ/v2/us.vwr.com/canonicalurlandhref',
assetReferences: (baseProduct: string): string =>
`/occ/v2/us.vwr.com/products/${baseProduct}/assetreferences`,
} as const;
/**
* Derives the unique product key from a VWR search product: its `code` (the
* same value passed to `.setID`), stable across the query→detail transition.
* @param data - The raw VWR search product
* @returns The product's code
* @example
* ```typescript
* this.getUniqueProductKey(item); // "MFCD00003462"
* ```
* @source
*/
protected getUniqueProductKey(data: VWRSearchProduct): string {
return String(data.code);
}
/**
* Ensures a valid bearer token is present, fetching a fresh one when it is unset or within the
* safety margin of expiry. On success the token is cached with its expiry and merged into
* `this.headers` as an `Authorization` header used by every subsequent request.
* @returns Promise that resolves once a usable token is in `this.headers`
* @example
* ```typescript
* await this.ensureAccessToken(); // this.headers.Authorization === "bearer <token>"
* ```
* @source
*/
private async ensureAccessToken(): Promise<void> {
const now = Date.now();
if (
this.accessToken &&
this.accessTokenExpiresAt &&
now < this.accessTokenExpiresAt - this.tokenSafetyMarginMs
) {
return;
}
const body = new URLSearchParams({
client_id: this.clientId,
client_secret: '',
grant_type: 'client_credentials',
}).toString();
const response = await this.httpPost({
path: this.paths.token,
host: this.apiURL,
body,
headers: { 'content-type': 'application/x-www-form-urlencoded' },
});
const tokenData = response ? await response.json() : undefined;
if (!isVWRTokenResponse(tokenData)) {
this.logger.error('Invalid VWR token response', { tokenData });
throw new TypeError('SupplierVWR| Failed to obtain access token');
}
this.accessToken = tokenData.access_token;
this.accessTokenExpiresAt = Date.now() + tokenData.expires_in * 1000;
this.headers = {
...this.headers,
Authorization: `${tokenData.token_type} ${tokenData.access_token}`,
};
}
/**
* Lazy per-instance setup hook. Runs once before the first query and obtains the initial token.
* @returns Promise that resolves once setup is complete
* @source
*/
protected async setup(): Promise<void> {
await this.ensureAccessToken();
}
/**
* Searches VWR for the given query and walks pages until it has `limit` matches. The API caps
* `pageSize` at 10, so pages are fetched {@link maxConcurrentRequests} at a time in parallel;
* each page is filtered (discontinued / restricted), fuzzy + AST filtered, and its survivors
* accumulated. Once a batch completes, another batch is dispatched only if we still need more.
* Pagination stops once `limit` is reached, the last page is consumed, or
* {@link maxEmptySearchBatches} consecutive batches produce no survivors (so we don't crawl every
* page of a broad query).
* @param query - The search term
* @param limit - Maximum number of ranked products to return (defaults to the instance limit)
* @returns Promise resolving to ranked ProductBuilder instances, or void when nothing matched
* @example
* ```typescript
* const builders = await this.queryProducts("sulfuric acid", 20);
* ```
* @source
*/
protected async queryProducts(
query: string,
limit: number = this.limit,
): Promise<ProductBuilder<Product>[] | void> {
const builders: ProductBuilder<Product>[] = [];
const batchSize = Math.max(1, this.maxConcurrentRequests);
// Unknown until the first response reports it; Infinity means "no cap yet".
let totalPages = Number.POSITIVE_INFINITY;
let nextPage = 0;
let emptyStreak = 0;
while (builders.length < limit) {
const count = Math.min(batchSize, totalPages - nextPage);
if (count <= 0) {
break;
}
const pageIndexes = Array.from({ length: count }, (_, i) => nextPage + i);
nextPage += count;
const responses = await Promise.all(pageIndexes.map((page) => this.searchPage(query, page)));
let batchSurvivors = 0;
for (const response of responses) {
if (!response) {
continue;
}
if (typeof response.pagination?.totalPages === 'number') {
totalPages = response.pagination.totalPages;
}
// Drop discontinued and restricted (e.g. license-required) products.
const products = response.products.filter(
(product) => product.discontinued !== true && product.restricted !== true,
);
// fuzzyFilterAst applies both the fuzzy score and the liqe/AST boolean predicate.
const survivors = this.fuzzyFilterAst<VWRSearchProduct>(products);
if (survivors.length > 0) {
builders.push(...this.initProductBuilders(survivors));
batchSurvivors += survivors.length;
}
}
if (batchSurvivors === 0) {
emptyStreak += 1;
if (emptyStreak >= this.maxEmptySearchBatches) {
this.logger.debug('VWR search: stopping after consecutive empty batches', {
query,
nextPage,
emptyStreak,
});
break;
}
} else {
emptyStreak = 0;
}
}
if (builders.length === 0) {
this.logger.warn('VWR search returned no usable products', { query });
return;
}
return builders.slice(0, limit);
}
/**
* Builds VWR's `query` search-param value, routing the term to the field VWR's
* search indexes it under: a CAS number to `cas_number`, a molecular formula to
* `chemical_formula_adv`, and a plain name to `chemical_name`. Anything else
* (e.g. a SMILES string) is passed through as the raw term. The identifier is
* used verbatim here so VWR runs a native identifier search; the base still
* fuzzy-matches the returned products against the factory-resolved chemical
* name (VWR leaves `supportsCAS`/`supportsFormula` false), so CAS/formula hits
* survive filtering.
* @param query - The raw search term
* @returns The `query` param value, e.g. `cas_number=7757-83-7`
* @example
* ```typescript
* this.searchQueryParam('7757-83-7'); // "cas_number=7757-83-7"
* this.searchQueryParam('Na2SO3'); // "chemical_formula_adv=Na2SO3"
* this.searchQueryParam('acetone'); // "chemical_name=acetone"
* ```
* @source
*/
private searchQueryParam(query: string): string {
switch (detectTermType(query)) {
case 'cas':
return `cas_number=${query}`;
case 'formula':
return `chemical_formula_adv=${query}`;
case 'string':
return `chemical_name=${query}`;
default:
return query;
}
}
/**
* Fetches and validates a single page of VWR search results.
* @param query - The search term
* @param page - Zero-based page index (sent as `currentPage`)
* @returns Promise resolving to the validated search response, or void on failure
* @source
*/
private async searchPage(query: string, page: number): Promise<VWRSearchResponse | void> {
const response = await this.httpPostJson({
path: this.paths.search,
host: this.apiURL,
body: '{}',
headers: { 'content-type': 'application/json' },
params: {
fields: 'FULL',
query: this.searchQueryParam(query),
pageSize: 10,
currentPage: page,
lang: 'en_US',
curr: 'USD',
newStorefront: true,
},
});
if (!isVWRSearchResponse(response)) {
this.logger.error('Invalid VWR search response', { response, page });
return;
}
return response;
}
/**
* Builds initial ProductBuilder instances from raw VWR search products. Sets title, price, ids,
* description and image from the search item, and a synthesized product URL that encodes the
* `baseProduct` id (used later by {@link getProductData} to fetch detail data).
* @param results - Raw VWR search products (already ranked/sliced)
* @returns Array of initialized ProductBuilder instances
* @example
* ```typescript
* const builders = this.initProductBuilders(rankedSearchProducts);
* ```
* @source
*/
protected initProductBuilders(results: VWRSearchProduct[]): ProductBuilder<Product>[] {
return results.map((item) => {
const builder = new ProductBuilder<Product>(this.baseURL);
const title = item.displayName ?? item.name ?? '';
const price = item.uomSpecificPrices?.[0];
builder
.setBasicInfo(title, this.productUrl(item), this.supplierName)
.setMatchPercentage(this.matchScoreOf(item))
.setData(this.productDefaults)
.setID(item.code)
.setCacheKey(this.getUniqueProductKey(item))
.setSku(item.vwrCatalogNumber ?? item.code)
.setDescription(item.description);
if (price) {
builder.setPricing(price.value, price.currencyIso ?? 'USD', '$');
}
const image = item.images?.find((img) => img.imageType === 'PRIMARY') ?? item.images?.[0];
if (image) {
builder.setImage(image.url, title).setThumbnail(image.url);
}
return builder;
});
}
/**
* Selects the title used for fuzzy matching from a raw VWR search product.
* @param data - Raw VWR search product
* @returns The product's display title
* @source
*/
protected titleSelector(data: VWRSearchProduct): string {
return data.displayName ?? data.name ?? '';
}
/**
* Enriches a ranked product with detail data. Fetches the ordertable, asset references, chemical
* substance, chemical specification and canonical URL in parallel, plus one batched
* stock-availability call, and applies quantity/uom, pricing, CAS/formula/molecular weight,
* purity, the canonical product link, SDS + COA links, availability and variants.
* @param product - The ProductBuilder to enrich
* @returns Promise resolving to the enriched builder, or void on failure
* @example
* ```typescript
* const enriched = await this.getProductData(builder);
* ```
* @source
*/
protected async getProductData(
product: ProductBuilder<Product>,
): Promise<ProductBuilder<Product> | void> {
return this.getProductDataWithCache(product, async (builder) => {
const baseProduct = this.baseProductFromUrl(builder.get('url'));
if (!baseProduct) {
this.logger.warn('VWR getProductData| could not derive baseProduct', {
url: builder.get('url'),
});
return builder;
}
const commonParams = {
lang: 'en_US',
curr: 'USD',
newStorefront: true,
};
const [ordertable, assets, substance, specification, canonicalUrl] = await Promise.all([
this.httpGetJson({
path: this.paths.ordertable,
host: this.apiURL,
params: { ...commonParams, productId: baseProduct, impressions: '', user: 'anonymous' },
}),
this.httpGetJson({
path: this.paths.assetReferences(baseProduct),
host: this.apiURL,
params: { ...commonParams, fields: 'DEFAULT' },
}),
this.httpGetJson({
path: this.paths.substance,
host: this.apiURL,
params: { ...commonParams, productId: baseProduct, user: 'anonymous' },
}),
this.httpGetJson({
path: this.paths.specification,
host: this.apiURL,
params: { ...commonParams, productId: baseProduct, user: 'anonymous' },
}),
this.fetchCanonicalUrl(baseProduct),
]);
if (canonicalUrl) {
builder.setURL(canonicalUrl).setPermalink(canonicalUrl);
}
this.applySubstance(builder, substance);
this.applySpecification(builder, specification);
await this.applyOrdertable(builder, ordertable);
this.applyAssetReferences(builder, ordertable, assets);
return builder;
});
}
/**
* Applies chemical substance attributes (CAS, formula, molecular weight) to the builder.
* @param builder - The ProductBuilder to enrich
* @param substance - The raw substance response (validated internally)
* @returns void
* @source
*/
private applySubstance(builder: ProductBuilder<Product>, substance: unknown): void {
if (!isVWRSubstanceResponse(substance)) {
return;
}
const attr = (name: string): string | undefined =>
substance.substanceAttributes.find((a) => a.code === name || a.name === name)?.value;
// MW_value may carry a unit suffix (e.g. "79.06 g/mol"); take just the leading number.
const moleweight = attr('MW_value')?.match(/\d+(?:\.\d+)?/)?.[0];
builder.setCAS(attr('c_cas')).setFormula(attr('c_formula')).setMoleweight(moleweight);
}
/**
* Applies the product purity from the chemical specification response. Uses the `Purity` row's
* result (e.g. `"> 98 %"`); `setPurity` extracts the percentage token.
* @param builder - The ProductBuilder to enrich
* @param specification - The raw specification response (validated internally)
* @returns void
* @source
*/
private applySpecification(builder: ProductBuilder<Product>, specification: unknown): void {
if (!isVWRSpecificationResponse(specification)) {
return;
}
const purity = specification.find((entry) => entry.name.toLowerCase() === 'purity')?.result;
builder.setPurity(purity);
}
/**
* Fetches the canonical (SEO-friendly) product URL, a plain-text absolute href returned by the
* `canonicalurlandhref` endpoint. Returns undefined when the request fails or the body isn't a URL.
* @param baseProduct - The base product id
* @returns Promise resolving to the absolute product URL, or undefined
* @source
*/
private async fetchCanonicalUrl(baseProduct: string): Promise<string | undefined> {
try {
const response = await this.httpGet({
path: this.paths.canonicalUrl,
host: this.apiURL,
params: {
pageType: 'product',
id: baseProduct,
lang: 'en_US',
curr: 'USD',
newStorefront: true,
},
});
if (!response) {
return undefined;
}
const url = (await response.text()).trim();
return url.startsWith('http') ? url : undefined;
} catch (error: unknown) {
this.logger.warn(`VWR canonical URL fetch failed: ${getErrorMessage(error)}`, {
baseProduct,
error,
});
return undefined;
}
}
/**
* Applies ordertable detail (quantity/uom, refined price, availability, variants) to the builder.
* Picks the row matching the builder's id, falling back to the first row, and fires one batched
* stock-availability call for all variant catalog numbers.
* @param builder - The ProductBuilder to enrich
* @param ordertable - The raw ordertable response (validated internally)
* @returns Promise that resolves once enrichment is applied
* @source
*/
private async applyOrdertable(
builder: ProductBuilder<Product>,
ordertable: unknown,
): Promise<void> {
if (!isVWROrdertableResponse(ordertable)) {
return;
}
const rows = ordertable.productRows;
if (rows.length === 0) {
return;
}
const code = String(builder.get('id') ?? '');
const matched = rows.find((row) => row.code === code) ?? rows[0];
const quantity = parseQuantity(this.rowSize(matched) ?? '');
if (quantity) {
builder.setQuantity(quantity);
}
const price = matched.prices?.[0];
if (price) {
builder.setPricing(price.listPrice, price.currencyCode ?? 'USD', '$');
}
const stockMap = await this.fetchStock(
rows.map((row) => row.catalogNumber).filter((num): num is string => Boolean(num)),
);
const matchedStock = stockMap.get(matched.catalogNumber);
if (matchedStock) {
builder.setAvailability(matchedStock.stockStatus === 'inStock');
builder.setStatusTxt(matchedStock.availabilityMessage);
}
builder.addVariants(
rows.map((row) => {
const variantQuantity = parseQuantity(this.rowSize(row) ?? '');
const stock = stockMap.get(row.catalogNumber);
const variant: Partial<Variant> = {
id: row.code,
sku: row.catalogNumber,
title: row.name,
price: row.prices?.[0]?.listPrice,
...(variantQuantity ?? {}),
};
if (stock) {
variant.availability =
stock.stockStatus === 'inStock' ? AVAILABILITY.IN_STOCK : AVAILABILITY.OUT_OF_STOCK;
}
return variant;
}),
);
}
/**
* Applies SDS and COA document links. SDS prefers an `en_US` MSDS asset and falls back to the
* matched ordertable row's `downloadSDSLink`; COA uses the first `en_US` certificate-of-analysis.
* @param builder - The ProductBuilder to enrich
* @param ordertable - The raw ordertable response (for the SDS fallback link)
* @param assets - The raw asset-references response (validated internally)
* @returns void
* @source
*/
private applyAssetReferences(
builder: ProductBuilder<Product>,
ordertable: unknown,
assets: unknown,
): void {
const sdsFromAssets = isVWRAssetReferencesResponse(assets)
? this.pickAsset(assets.assetReferences, 'MSDS')
: undefined;
const coa = isVWRAssetReferencesResponse(assets)
? this.pickAsset(assets.assetReferences, 'CERTIFICATE_OF_ANALYSIS')
: undefined;
const sdsFallback = isVWROrdertableResponse(ordertable)
? (ordertable.productRows.find((row) => row.downloadSDSLink)?.downloadSDSLink ??
ordertable.downloadSDSLink)
: undefined;
builder.setSDSUrl(sdsFromAssets ?? sdsFallback).setCoaUrl(coa);
}
/**
* Picks the URL of the first asset of the given type, preferring an `en_US` localization.
* @param assetReferences - The asset references to search
* @param assetType - The asset type to match (e.g. `"MSDS"`, `"CERTIFICATE_OF_ANALYSIS"`)
* @returns The chosen asset URL, or undefined if none match
* @source
*/
private pickAsset(
assetReferences: VWRAssetReference[],
assetType: NonNullable<VWRAssetReference['assetType']>,
): string | undefined {
const ofType = assetReferences.filter((asset) => asset.assetType === assetType);
const preferred = ofType.find((asset) => asset.languageLists?.includes('en_US'));
return (preferred ?? ofType[0])?.url;
}
/**
* Fetches per-catalog-number stock availability in a single batched request.
* @param catalogNumbers - The variant catalog numbers to look up
* @returns Map of catalog number to its availability status/message (empty on failure)
* @source
*/
private async fetchStock(
catalogNumbers: string[],
): Promise<Map<string, { stockStatus?: string; availabilityMessage?: string }>> {
const stockMap = new Map<string, { stockStatus?: string; availabilityMessage?: string }>();
if (catalogNumbers.length === 0) {
return stockMap;
}
const response = await this.httpPostJson({
path: this.paths.stock,
host: this.apiURL,
body: catalogNumbers.map((catalogNumber) => ({ catalogNumber })),
headers: { 'content-type': 'application/json' },
params: {
fields: 'FULL',
lang: 'en_US',
curr: 'USD',
newStorefront: true,
},
});
if (!isVWRStockResponse(response)) {
this.logger.warn('Invalid VWR stock response', { response });
return stockMap;
}
for (const detail of response.articleAvailabilityDetails.articleAvailabilityDetail) {
stockMap.set(detail.catalogNumber, {
stockStatus: detail.availability.stockStatus,
availabilityMessage: detail.availability.availabilityMessage,
});
}
return stockMap;
}
/**
* Reads the `o_size` cell (e.g. `"2.5 L"`) from an ordertable row's column map.
* @param row - The ordertable product row
* @returns The size string, or undefined if not present
* @source
*/
private rowSize(row: VWRProductRow): string | undefined {
return row.colCellMap?.entry?.find((cell) => cell.key === 'o_size')?.value ?? undefined;
}
/**
* Builds a synthesized, absolute product URL that encodes the `baseProduct` id so it can be
* recovered during detail enrichment and doubles as the product-detail cache key.
* @param item - The raw VWR search product
* @returns A relative product path (resolved to absolute by the builder)
* @source
*/
private productUrl(item: VWRSearchProduct): string {
return `/store/product/${item.baseProduct}/${encodeURIComponent(item.code)}`;
}
/**
* Extracts the `baseProduct` id from a synthesized product URL.
* @param url - The product URL (absolute or relative)
* @returns The baseProduct id, or undefined if the URL doesn't match the expected shape
* @source
*/
private baseProductFromUrl(url: unknown): string | undefined {
if (typeof url !== 'string') {
return undefined;
}
return url.match(/\/store\/product\/([^/]+)\//)?.[1];
}
}
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