made add company details api and moved it in the host folder

src/common/utils/helper/parseMultipartFormData.ts

@@ -0,0 +1,126 @@
+import ApiError from './ApiError';
+
+interface ParsedFormData {
+  fields: Record<string, string>;
+  files: Array<{
+    fieldName: string;
+    fileName: string;
+    contentType: string;
+    data: Buffer;
+  }>;
+}
+
+/**
+ * Parse multipart/form-data from Lambda event
+ * Supports both base64 encoded and binary body
+ */
+export function parseMultipartFormData(
+  eventBody: string | null,
+  contentType: string | undefined,
+  isBase64Encoded: boolean = false
+): ParsedFormData {
+  if (!eventBody) {
+    throw new ApiError(400, 'Request body is required');
+  }
+
+  if (!contentType || !contentType.includes('multipart/form-data')) {
+    throw new ApiError(400, 'Content-Type must be multipart/form-data');
+  }
+
+  // Extract boundary from Content-Type header
+  const boundaryMatch = contentType.match(/boundary=([^;]+)/);
+  if (!boundaryMatch) {
+    throw new ApiError(400, 'Invalid multipart boundary');
+  }
+  const boundary = boundaryMatch[1].trim();
+
+  // Decode base64 body if needed (API Gateway sends base64 encoded for binary media types)
+  let bodyBuffer: Buffer;
+  try {
+    if (isBase64Encoded) {
+      bodyBuffer = Buffer.from(eventBody, 'base64');
+    } else {
+      // Try to detect if it's base64
+      if (eventBody.match(/^[A-Za-z0-9+/=]+$/)) {
+        bodyBuffer = Buffer.from(eventBody, 'base64');
+      } else {
+        bodyBuffer = Buffer.from(eventBody, 'binary');
+      }
+    }
+  } catch (error) {
+    throw new ApiError(400, 'Invalid request body encoding');
+  }
+
+  // Split by boundary
+  const parts = bodyBuffer.toString('binary').split(`--${boundary}`);
+
+  const fields: Record<string, string> = {};
+  const files: ParsedFormData['files'] = [];
+
+  for (const part of parts) {
+    if (!part || part.trim() === '' || part.trim() === '--') {
+      continue;
+    }
+
+    // Split headers and body
+    const [headers, ...bodyParts] = part.split('\r\n\r\n');
+    if (!headers || bodyParts.length === 0) {
+      continue;
+    }
+
+    const body = bodyParts.join('\r\n\r\n').trim();
+    if (!body) {
+      continue;
+    }
+
+    // Parse Content-Disposition header
+    const contentDispositionMatch = headers.match(/Content-Disposition:\s*form-data;\s*name="([^"]+)"/);
+    if (!contentDispositionMatch) {
+      continue;
+    }
+
+    const fieldName = contentDispositionMatch[1];
+
+    // Check if it's a file
+    const filenameMatch = headers.match(/filename="([^"]+)"/);
+    const contentTypeMatch = headers.match(/Content-Type:\s*([^\r\n]+)/);
+
+    if (filenameMatch) {
+      // It's a file
+      const fileName = filenameMatch[1];
+      const fileContentType = contentTypeMatch ? contentTypeMatch[1].trim() : 'application/octet-stream';
+      
+      // Convert body to buffer (remove trailing boundary markers)
+      const fileData = Buffer.from(body.replace(/\r\n--$/, ''), 'binary');
+
+      files.push({
+        fieldName,
+        fileName,
+        contentType: fileContentType,
+        data: fileData,
+      });
+    } else {
+      // It's a regular field
+      fields[fieldName] = body.replace(/\r\n--$/, '').trim();
+    }
+  }
+
+  return { fields, files };
+}
+
+/**
+ * Parse JSON field from form data
+ */
+export function parseJsonField(fields: Record<string, string>, fieldName: string): any {
+  const value = fields[fieldName];
+  if (!value) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(value);
+  } catch (error) {
+    throw new ApiError(400, `Invalid JSON in field: ${fieldName}`);
+  }
+}
+