node-red-contrib-open-food-facts
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A Node-RED node that provides easy integration with the Open Food Facts API. Search for products, retrieve product information, add products, and manage product images.
494 lines (446 loc) • 16.5 kB
JavaScript
/**
* OpenFoodFacts API client for Node-RED
* A client library for interacting with the Open Food Facts API
*/
const he = require('he');
/**
* Custom error class for OpenFoodFacts API errors
* @class OpenFoodFactsError
* @extends {Error}
*/
class OpenFoodFactsError extends Error {
/**
* Creates an instance of OpenFoodFactsError
* @param {string} message - Error message
* @param {string} details - Additional error details
* @param {number} status - HTTP status code
*/
constructor(message, details, status) {
super(message);
this.name = 'OpenFoodFactsError';
this.details = details;
this.status = status;
}
}
/**
* Main API client for interacting with the Open Food Facts API
* @class OpenFoodFactsAPI
*/
class OpenFoodFactsAPI {
/**
* Creates an instance of OpenFoodFactsAPI
* @param {string} [baseUrl='https://world.openfoodfacts.org'] - Base URL for the API (must use HTTPS for authenticated requests)
*/
constructor(baseUrl = 'https://world.openfoodfacts.org') {
// Validate that baseUrl uses HTTPS for security
if (!baseUrl.startsWith('https://')) {
throw new Error('HTTPS is required for secure API access. Use https:// URLs only.');
}
this.baseUrl = baseUrl;
this.credentials = null;
}
/**
* Sets user credentials for authenticated requests
* WARNING: Credentials will be sent over the network. Ensure you're using HTTPS.
* @param {string} userId - Open Food Facts user ID
* @param {string} password - Open Food Facts password
*/
setCredentials(userId, password) {
if (typeof userId !== 'string' || typeof password !== 'string') {
throw new Error('User ID and password must be strings');
}
if (!userId.trim() || !password.trim()) {
throw new Error('User ID and password cannot be empty');
}
this.credentials = { userId, password };
}
/**
* Validates barcode format
* @param {string} barcode - Barcode to validate
* @param {boolean} allowPartial - Allow partial barcodes for search
* @private
*/
_validateBarcode(barcode, allowPartial = false) {
if (typeof barcode !== 'string') {
throw new Error('Barcode must be a string');
}
if (allowPartial) {
if (!/^\d+$/.test(barcode) || barcode.length === 0) {
throw new Error('Invalid barcode format. Must contain only digits.');
}
} else {
if (!/^\d{8,13}$/.test(barcode)) {
throw new Error('Invalid barcode format. Must be 8-13 digits.');
}
}
}
/**
* Validates image file for upload
* @param {File} file - File to validate
* @private
*/
async _validateImageFile(file) {
if (!file) {
throw new Error('Image file is required');
}
// Only validate file properties if they exist (allows for mock objects in tests)
if (file.type !== undefined) {
const allowedTypes = ['image/jpeg', 'image/jpg', 'image/png', 'image/webp'];
if (!allowedTypes.includes(file.type)) {
throw new Error('Invalid file type. Only JPEG, PNG, and WebP images are allowed.');
}
}
if (file.size !== undefined) {
const maxSize = 10 * 1024 * 1024; // 10MB
if (file.size > maxSize) {
throw new Error('File size too large. Maximum size is 10MB.');
}
}
// Additional magic byte validation for enhanced security
if (file.arrayBuffer && typeof file.arrayBuffer === 'function') {
try {
const buffer = await file.arrayBuffer();
const bytes = new Uint8Array(buffer);
// Check magic bytes for known image formats
const signatures = {
jpeg: [0xFF, 0xD8, 0xFF],
png: [0x89, 0x50, 0x4E, 0x47],
webp: [0x52, 0x49, 0x46, 0x46] // RIFF header (WebP starts with RIFF)
};
let validSignature = false;
for (const [format, signature] of Object.entries(signatures)) {
if (signature.every((byte, index) => bytes[index] === byte)) {
// Additional check for WebP format - verify 'WEBP' identifier at offset 8
if (format === 'webp' && bytes.length >= 12) {
const webpIdentifier = [0x57, 0x45, 0x42, 0x50]; // 'WEBP'
if (!webpIdentifier.every((byte, index) => bytes[8 + index] === byte)) {
continue; // RIFF header found but not WebP, continue checking other formats
}
}
validSignature = true;
break;
}
}
if (!validSignature) {
throw new Error('File content does not match allowed image formats');
}
} catch (error) {
// If magic byte validation fails, throw the error
if (error.message === 'File content does not match allowed image formats') {
throw error;
}
// For other errors (e.g., reading buffer), we'll log and continue
// This maintains compatibility with environments where arrayBuffer might not be available
}
}
}
/**
* Sanitizes search parameters
* @param {string} input - Input to sanitize
* @private
*/
_sanitizeSearchInput(input) {
if (typeof input !== 'string') {
throw new Error('Search input must be a string');
}
// Use he.js library for robust HTML entity encoding and limit length
return he.encode(input).trim().substring(0, 100);
}
/**
* Creates headers for requests (reserved for future use)
* @returns {Object} Headers object
* @private
*/
_createRequestHeaders() {
return {
'User-Agent': 'node-red-contrib-open-food-facts/0.2.2'
};
}
/**
* Validates that the connection uses HTTPS before sending credentials
* @private
*/
_validateSecureConnection() {
if (!this.baseUrl.startsWith('https://')) {
throw new Error('Cannot send credentials over non-HTTPS connection. HTTPS is required for authenticated requests.');
}
}
/**
* Fetches product details by barcode
* @param {string} barcode - Product barcode
* @returns {Promise<Object>} Product details
*/
async getProduct(barcode) {
this._validateBarcode(barcode);
try {
const response = await fetch(`${this.baseUrl}/api/v0/product/${barcode}`);
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
const { product } = await response.json();
// Client-side field filtering
const {
code,
product_name,
brands,
quantity,
serving_size,
packaging,
// nutriments,
storage_conditions,
conservation_conditions,
expiration_date_format,
categories,
labels,
food_groups,
} = product;
return {
code,
product_name,
brands,
quantity,
serving_size,
packaging,
// nutriments,
storage_conditions,
conservation_conditions,
expiration_date_format,
categories,
labels,
food_groups,
};
} catch (error) {
throw new Error(`Failed to fetch product: ${error.message}`);
}
}
/**
* Searches for products using various criteria
* @param {Object} params - Search parameters
* @param {string} [params.search_terms] - Text search terms
* @param {string} [params.code] - Product code to search for
* @param {string} [params.code_type] - Type of code match: 'exact', 'contains', 'starts', 'ends'
* @param {Array} [params.tagType] - Types of tags to search
* @param {Array} [params.tag] - Tag values to search for
* @param {Array} [params.tagContains] - How to match tags
* @param {string} [params.additives] - Filter by additives
* @param {string} [params.ingredientsFromPalmOil] - Filter by palm oil content
* @param {number} [params.page] - Page number for pagination
* @param {number} [params.pageSize] - Page size for pagination
* @param {Array} [params.fields] - Fields to include in results
* @param {string} [params.action='process'] - Action to perform
* @returns {Promise<Object>} Search results
*/
async searchProducts(params) {
try {
const queryParams = new URLSearchParams({
json: 'true', // Ensure JSON response
action: params.action || 'process',
});
// Add text search if provided
if (params.search_terms) {
queryParams.append('search_terms', this._sanitizeSearchInput(params.search_terms));
}
// Handle code search with different matching types
if (params.code) {
this._validateBarcode(params.code, true);
queryParams.append('code', params.code);
if (params.code_type) {
switch (params.code_type) {
case 'contains':
queryParams.append('code_type', 'contains');
break;
case 'starts':
queryParams.append('code_type', 'starts');
break;
case 'ends':
queryParams.append('code_type', 'ends');
break;
default:
queryParams.append('code_type', 'exact');
}
}
}
// Handle tag-based search parameters
if (params.tagType && params.tag && params.tagContains) {
params.tagType.forEach((type, index) => {
queryParams.append(`tagtype_${index}`, type);
queryParams.append(`tag_contains_${index}`, params.tagContains[index]);
queryParams.append(`tag_${index}`, params.tag[index]);
});
}
// Handle additional filters
if (params.additives) queryParams.append('additives', params.additives);
if (params.ingredientsFromPalmOil) queryParams.append('ingredients_from_palm_oil', params.ingredientsFromPalmOil);
// Handle pagination
if (params.page) queryParams.append('page', params.page.toString());
if (params.pageSize) queryParams.append('page_size', params.pageSize.toString());
// For debugging - consider enabling through an optional config parameter
// console.log(`${this.baseUrl}/cgi/search.pl?${queryParams.toString()}`);
const response = await fetch(`${this.baseUrl}/cgi/search.pl?${queryParams.toString()}`);
if (!response.ok) {
throw new OpenFoodFactsError(`HTTP error! status: ${response.status}`, 'API request failed', response.status);
}
const data = await response.json();
if (!data || typeof data !== 'object') {
throw new Error('Invalid response format');
}
// Client-side field filtering - only filter if fields are provided (fixed hardcoded override)
if (params.fields && Array.isArray(params.fields) && params.fields.length > 0) {
return {
...data,
products: data.products.map((product) => {
const filtered = {};
params.fields.forEach((field) => {
if (field in product) {
filtered[field] = product[field];
}
});
return filtered;
}),
};
}
return data;
} catch (error) {
if (error instanceof OpenFoodFactsError) {
throw error;
}
if (error.message === 'Invalid response format') {
throw error; // Pass through this specific error without wrapping
}
throw new Error(`Failed to search products: ${error.message}`);
}
}
/**
* Adds a new product to the database
* @param {Object} data - Product data
* @param {string} data.code - Product barcode
* @param {string} [data.brands] - Product brands
* @param {string} [data.labels] - Product labels
* @returns {Promise<Object>} API response
*/
async addProduct(data) {
if (!this.credentials) {
throw new Error('Credentials required for adding products');
}
// Ensure secure connection before sending credentials
this._validateSecureConnection();
this._validateBarcode(data.code);
try {
const formData = new FormData();
formData.append('code', data.code);
formData.append('user_id', this.credentials.userId);
formData.append('password', this.credentials.password);
if (data.brands) formData.append('brands', this._sanitizeSearchInput(data.brands));
if (data.labels) formData.append('labels', this._sanitizeSearchInput(data.labels));
const headers = this._createRequestHeaders();
const response = await fetch(`${this.baseUrl}/cgi/product_jqm2.pl`, {
method: 'POST',
headers,
body: formData,
});
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
return await response.json();
} catch (error) {
throw new Error(`Failed to add product: ${error.message}`);
}
}
/**
* Uploads a photo for a product
* @param {string} barcode - Product barcode
* @param {File} image - Image file to upload
* @param {Object} type - Photo type information
* @param {string} type.field - Field type (front, ingredients, nutrition)
* @param {string} type.languageCode - Language code for the image
* @returns {Promise<Object>} API response
*/
async uploadPhoto(barcode, image, type) {
if (!this.credentials) {
throw new Error('Credentials required for uploading photos');
}
// Ensure secure connection before sending credentials
this._validateSecureConnection();
this._validateBarcode(barcode);
await this._validateImageFile(image);
if (!type || !type.field || !type.languageCode) {
throw new Error('Type with field and languageCode is required');
}
const allowedFields = ['front', 'ingredients', 'nutrition'];
if (!allowedFields.includes(type.field)) {
throw new Error('Invalid field type. Must be front, ingredients, or nutrition.');
}
try {
const formData = new FormData();
formData.append('code', barcode);
formData.append('user_id', this.credentials.userId);
formData.append('password', this.credentials.password);
formData.append('imagefield', `${type.field}_${type.languageCode}`);
formData.append(`imgupload_${type.field}_${type.languageCode}`, image);
const headers = this._createRequestHeaders();
const response = await fetch(`${this.baseUrl}/cgi/product_image_upload.pl`, {
method: 'POST',
headers,
body: formData,
});
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
return await response.json();
} catch (error) {
throw new Error(`Failed to upload photo: ${error.message}`);
}
}
/**
* Fetches taxonomy data by type
* @param {string} type - Taxonomy type
* @returns {Promise<Object>} Taxonomy data
*/
async getTaxonomy(type) {
try {
const response = await fetch(`${this.baseUrl}/data/taxonomies/${type}.json`);
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
return await response.json();
} catch (error) {
throw new Error(`Failed to fetch taxonomy: ${error.message}`);
}
}
/**
* Fetches additives taxonomy
* @returns {Promise<Object>} Additives taxonomy
*/
async getAdditives() {
return this.getTaxonomy('additives');
}
/**
* Fetches allergens taxonomy
* @returns {Promise<Object>} Allergens taxonomy
*/
async getAllergens() {
return this.getTaxonomy('allergens');
}
/**
* Fetches brands taxonomy
* @returns {Promise<Object>} Brands taxonomy
*/
async getBrands() {
return this.getTaxonomy('brands');
}
/**
* Fetches random insights from Robotoff
* @param {number} [count=1] - Number of insights to fetch
* @param {string} [lang] - Language filter
* @returns {Promise<Object>} Random insights
*/
async getRandomInsight(count = 1, lang) {
try {
const queryParams = new URLSearchParams({
count: count.toString(),
});
if (lang) queryParams.append('lang', lang);
const response = await fetch(
`https://robotoff.openfoodfacts.org/api/v1/questions/random?${queryParams.toString()}`,
);
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
return await response.json();
} catch (error) {
throw new Error(`Failed to fetch random insight: ${error.message}`);
}
}
}
// Export the class and error
module.exports = { OpenFoodFactsAPI, OpenFoodFactsError };