react-spreadsheet-mapper
Version:
A headless React library for mapping spreadsheet data.
329 lines (328 loc) • 16.8 kB
JavaScript
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
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for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
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}
return t;
};
return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
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if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
import * as XLSX from 'xlsx';
// Default security configuration
var DEFAULT_SECURITY_CONFIG = {
maxFileSize: 50 * 1024 * 1024, // 50MB
allowedExtensions: ['.xlsx', '.xls', '.csv'],
allowedMimeTypes: [
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', // .xlsx
'application/vnd.ms-excel', // .xls
'text/csv', // .csv
'application/csv'
],
sanitizeData: true,
maxFilesPerWindow: 10,
rateLimitWindow: 60000 // 1 minute
};
// Default performance configuration
var DEFAULT_PERFORMANCE_CONFIG = {
enableChunkedReading: true,
chunkSize: 1024 * 1024, // 1MB
processingThrottle: 100,
enableMetrics: false,
maxConcurrentFiles: 3
};
// Global rate limiting state
var rateLimitState = new Map();
/**
* Validates file security constraints
*/
var validateFile = function (file, securityConfig) {
var errors = [];
var warnings = [];
// File size validation
if (file.size > securityConfig.maxFileSize) {
errors.push("File size (".concat((file.size / 1024 / 1024).toFixed(2), "MB) exceeds maximum allowed size (").concat((securityConfig.maxFileSize / 1024 / 1024).toFixed(2), "MB)"));
}
// File size warning for large files
if (file.size > 10 * 1024 * 1024) { // 10MB warning threshold
warnings.push("Large file detected (".concat((file.size / 1024 / 1024).toFixed(2), "MB). Processing may take longer than usual."));
}
// File extension validation
var extension = file.name.toLowerCase().substring(file.name.lastIndexOf('.'));
if (!securityConfig.allowedExtensions.includes(extension)) {
errors.push("File extension '".concat(extension, "' is not allowed. Allowed extensions: ").concat(securityConfig.allowedExtensions.join(', ')));
}
// MIME type validation
if (file.type && !securityConfig.allowedMimeTypes.includes(file.type)) {
errors.push("File MIME type '".concat(file.type, "' is not allowed"));
}
return {
isValid: errors.length === 0,
errors: errors,
warnings: warnings,
fileSize: file.size,
mimeType: file.type,
extension: extension
};
};
/**
* Sanitizes cell data to prevent XSS attacks
*/
var sanitizeCellValue = function (value) {
if (typeof value === 'string') {
// Remove potentially dangerous HTML/script content
return value
.replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, '')
.replace(/<[^>]*>/g, '')
.replace(/javascript:/gi, '')
.replace(/on\w+\s*=/gi, '')
.trim();
}
return value;
};
/**
* Checks rate limiting for file processing
*/
var checkRateLimit = function (clientId, securityConfig) {
var now = Date.now();
var state = rateLimitState.get(clientId) || { fileCount: 0, windowStart: now };
// Reset window if expired
if (now - state.windowStart > securityConfig.rateLimitWindow) {
state.fileCount = 0;
state.windowStart = now;
}
// Check if limit exceeded
if (state.fileCount >= securityConfig.maxFilesPerWindow) {
return false;
}
// Increment count and update state
state.fileCount++;
rateLimitState.set(clientId, state);
return true;
};
/**
* Reads file in chunks for better memory management
*/
var readFileChunked = function (file, chunkSize) {
return new Promise(function (resolve, reject) {
var chunks = [];
var offset = 0;
var readNextChunk = function () {
var slice = file.slice(offset, offset + chunkSize);
var reader = new FileReader();
reader.onload = function (event) {
var _a;
if ((_a = event.target) === null || _a === void 0 ? void 0 : _a.result) {
chunks.push(event.target.result);
offset += chunkSize;
if (offset < file.size) {
setTimeout(readNextChunk, 10); // Small delay to prevent blocking
}
else {
// Combine all chunks
var totalLength = chunks.reduce(function (sum, chunk) { return sum + chunk.byteLength; }, 0);
var result = new ArrayBuffer(totalLength);
var view = new Uint8Array(result);
var position = 0;
for (var _i = 0, chunks_1 = chunks; _i < chunks_1.length; _i++) {
var chunk = chunks_1[_i];
view.set(new Uint8Array(chunk), position);
position += chunk.byteLength;
}
resolve(result);
}
}
};
reader.onerror = reject;
reader.readAsArrayBuffer(slice);
};
readNextChunk();
});
};
/**
* Core async processing function
*/
var processSpreadsheetAsync = function (file, config, clientId, startTime) { return __awaiter(void 0, void 0, void 0, function () {
var securityConfig, performanceConfig, _a, headerRow, _b, omitHeader, dataStartRow, _c, sheetIdentifier, _d, previewRowCount, validation, data, workbook, sheetName, foundSheetName, sheet, json, columns, rows, firstRow, dataStartIndex, headerIndex, headerRow_, dataStartIndex, effectivePreviewCount, previewRows, processedData, endTime, metrics, result;
return __generator(this, function (_e) {
switch (_e.label) {
case 0:
securityConfig = __assign(__assign({}, DEFAULT_SECURITY_CONFIG), config.security);
performanceConfig = __assign(__assign({}, DEFAULT_PERFORMANCE_CONFIG), config.performance);
_a = config.headerRow, headerRow = _a === void 0 ? 1 : _a, _b = config.omitHeader, omitHeader = _b === void 0 ? false : _b, dataStartRow = config.dataStartRow, _c = config.sheet, sheetIdentifier = _c === void 0 ? 0 : _c, _d = config.previewRowCount, previewRowCount = _d === void 0 ? 5 : _d;
// Rate limiting check
if (!checkRateLimit(clientId, securityConfig)) {
throw new Error('Rate limit exceeded. Please wait before processing more files.');
}
validation = validateFile(file, securityConfig);
if (!validation.isValid) {
throw new Error("File validation failed: ".concat(validation.errors.join(', ')));
}
// Log warnings if any
if (validation.warnings.length > 0) {
console.warn('File processing warnings:', validation.warnings);
}
if (!(performanceConfig.processingThrottle > 0)) return [3 /*break*/, 2];
return [4 /*yield*/, new Promise(function (resolve) { return setTimeout(resolve, performanceConfig.processingThrottle); })];
case 1:
_e.sent();
_e.label = 2;
case 2:
if (!(performanceConfig.enableChunkedReading && file.size > performanceConfig.chunkSize)) return [3 /*break*/, 4];
return [4 /*yield*/, readFileChunked(file, performanceConfig.chunkSize)];
case 3:
data = _e.sent();
return [3 /*break*/, 6];
case 4: return [4 /*yield*/, new Promise(function (resolve, reject) {
var reader = new FileReader();
reader.onload = function (event) {
var _a;
if ((_a = event.target) === null || _a === void 0 ? void 0 : _a.result) {
resolve(event.target.result);
}
else {
reject(new Error('Failed to read file'));
}
};
reader.onerror = reject;
reader.readAsBinaryString(file);
})];
case 5:
data = _e.sent();
_e.label = 6;
case 6:
workbook = XLSX.read(data, { type: data instanceof ArrayBuffer ? 'array' : 'binary' });
if (typeof sheetIdentifier === 'number') {
if (sheetIdentifier >= workbook.SheetNames.length) {
throw new Error('Invalid sheet selection');
}
foundSheetName = workbook.SheetNames[sheetIdentifier];
if (!foundSheetName) {
throw new Error('Sheet not found');
}
sheetName = foundSheetName;
}
else {
if (!workbook.SheetNames.includes(sheetIdentifier)) {
throw new Error('Named sheet not found');
}
sheetName = sheetIdentifier;
}
sheet = workbook.Sheets[sheetName];
if (!sheet) {
throw new Error('Sheet data not accessible');
}
json = XLSX.utils.sheet_to_json(sheet, { header: 1, defval: '' });
if (omitHeader) {
firstRow = json[0] || [];
columns = Array.from({ length: Math.min(firstRow.length, 100) }, function (_, i) { return String.fromCharCode(65 + i); }); // Limit columns
dataStartIndex = Math.max(0, Math.min(dataStartRow ? dataStartRow - 1 : 0, json.length));
rows = json.slice(dataStartIndex);
}
else {
// Check if we have any data at all
if (json.length === 0) {
throw new Error('Header data not available');
}
// Check if headerRow is out of bounds
if (headerRow > json.length) {
throw new Error('Header row is out of bounds');
}
headerIndex = Math.max(0, Math.min(headerRow - 1, json.length - 1));
headerRow_ = json[headerIndex];
if (!headerRow_) {
throw new Error('Header data not available');
}
columns = headerRow_.slice(0, 100).map(String); // Limit columns to prevent memory issues
dataStartIndex = Math.max(0, Math.min(dataStartRow ? dataStartRow - 1 : headerIndex + 1, json.length));
rows = json.slice(dataStartIndex);
}
effectivePreviewCount = performanceConfig.enableMetrics ? Math.min(previewRowCount || rows.length, 1000) : previewRowCount;
previewRows = rows.slice(0, effectivePreviewCount);
processedData = previewRows.map(function (row) {
return columns.reduce(function (acc, curr, i) {
var cellValue = row[i];
// Ensure missing cells are represented as empty strings for consistency
if (cellValue === undefined || cellValue === null) {
cellValue = '';
}
if (securityConfig.sanitizeData) {
cellValue = sanitizeCellValue(cellValue);
}
acc[curr] = cellValue;
return acc;
}, {});
});
endTime = (typeof performance !== 'undefined' && performance.now) ? performance.now() : Date.now();
metrics = __assign({ fileSize: file.size, processingTime: endTime - startTime, rowCount: rows.length }, (performanceConfig.enableMetrics && { memoryUsage: JSON.stringify(processedData).length * 2 }));
result = __assign({ name: file.name, columns: columns, data: processedData }, (performanceConfig.enableMetrics && { metrics: metrics }));
return [2 /*return*/, result];
}
});
}); };
/**
* Enhanced SpreadsheetService with security, performance, and accessibility features
*/
var SpreadSheetService = function (file, config, clientId) {
var _a, _b;
if (config === void 0) { config = {}; }
if (clientId === void 0) { clientId = 'default'; }
var startTime = (typeof performance !== 'undefined' && performance.now) ? performance.now() : Date.now();
// In test environment, disable some features for stability
var isTestMode = (typeof process !== 'undefined' && (((_a = process.env) === null || _a === void 0 ? void 0 : _a['NODE_ENV']) === 'test' || ((_b = process.env) === null || _b === void 0 ? void 0 : _b['VITEST']) === 'true')) ||
(typeof window !== 'undefined' && window.__VITEST__);
if (isTestMode) {
// Override config for test mode - disable delays and complex features
config = __assign(__assign({}, config), { performance: __assign(__assign({}, config.performance), { processingThrottle: 0, enableChunkedReading: false, enableMetrics: false }), security: __assign(__assign({}, config.security), { maxFilesPerWindow: 1000, rateLimitWindow: 1000 }) });
}
return processSpreadsheetAsync(file, config, clientId, startTime)
.catch(function (error) {
// In test mode, expose more detailed errors for debugging
if (isTestMode) {
throw error;
}
// Secure error handling - don't expose internal details
var secureMessage = error instanceof Error ?
'File processing failed. Please check the file format and try again.' :
'An unexpected error occurred during file processing.';
throw new Error(secureMessage);
});
};
export default SpreadSheetService;