Tag: GCP

/**
 * Web app entry point for POST requests.
 * Expects JSON payload with:
 * {
 *   "tempId": "TEMPLATE_DOC_ID" | "templateId",
 *   "folderId": "DRIVE_FOLDER_ID",
 *   "filename": "Invoice 001",
 *   "tags": {
 *     "InvoiceNumber": "Lidia",
 *     "date": "123 €",
 *     "ClientName":"",
 *   }
 * }
 *
 * @param {GoogleAppsScript.Events.DoPost} e - The POST event.
 * @returns {GoogleAppsScript.Content.TextOutput} JSON response.
 */
function doPost(e) {
  let output;

  try {
    if (!e || !e.postData || !e.postData.contents) {
      throw new Error("Missing POST body.");
    }
    const payload = JSON.parse(e.postData.contents);

    const result = createInvoiceFromTemplate_(payload);

    const response = {
      success: true,
      invoiceId: result.id,
      invoiceUrl: result.url,
      filename: result.name,
    };

    output = ContentService
      .createTextOutput(JSON.stringify(response))
      .setMimeType(ContentService.MimeType.JSON);
  } catch (err) {
    const errorResponse = {
      success: false,
      error: String(err && err.message ? err.message : err),
    };

    output = ContentService
      .createTextOutput(JSON.stringify(errorResponse))
      .setMimeType(ContentService.MimeType.JSON);
  }

  return output;
}

/**
 * @typedef {Object} InvoiceRequestPayload
 * @property {string} [tempId] - Template document ID (legacy name).
 * @property {string} [templateId] - Template document ID (preferred name).
 * @property {string} [folderId] - Drive folder ID where the new doc should be stored.
 * @property {string} filename - Name for the new document.
 * @property {Object.<string, string|number|boolean|null>} tags - Map of placeholders to values.
 */

/**
 * @typedef {Object} InvoiceCreationResult
 * @property {string} id - Created document ID.
 * @property {string} url - Created document URL.
 * @property {string} name - Created document name.
 */

/**
 * Creates an invoice document from a template and replaces placeholders.
 *
 * @param {InvoiceRequestPayload} payload - Data describing the invoice to create.
 * @returns {InvoiceCreationResult} Information about the created document.
 */
function createInvoiceFromTemplate_(payload) {
  if (!payload) {
    throw new Error("Payload is required.");
  }

  const templateId = payload.templateId || payload.tempId;
  if (!templateId) {
    throw new Error("templateId (or tempId) is required.");
  }

  if (!payload.filename) {
    throw new Error("filename is required.");
  }


  let templateFile;
  try {
    templateFile = DriveApp.getFileById(templateId)
  } catch (err) {
    throw new Error("Template file not found or inaccessible.");
  }

  /** @type {GoogleAppsScript.Drive.Folder} */
  let targetFolder;

  if (payload.folderId) {
    try {
      targetFolder = DriveApp.getFolderById(payload.folderId);
    } catch (err) {
      throw new Error("Target folder not found or inaccessible.");
    }
  } else {
    // Fallback: use the template's parent folder if possible, or root
    const parents = templateFile.getParents();
    targetFolder = parents.hasNext() ? parents.next() : DriveApp.getRootFolder();
  }

  const copy = templateFile.makeCopy(payload.filename, targetFolder);
  const newDocId = copy.getId();
  const newDocUrl = copy.getUrl();

  const tags = payload.tags || {};
  if (Object.keys(tags).length > 0) {
    replaceTagsInDocument_(newDocId, tags);
  }

  return {
    id: newDocId,
    url: newDocUrl,
    name: copy.getName(),
  };
}

/**
 * Replaces placeholders in a Google Docs document body.
 * Placeholders are expected in the form {{key}}.
 *
 * @param {string} docId - ID of the document to update.
 * @param {Object.<string, string|number|boolean|null>} tags - Map of placeholders to values.
 * @returns {void}
 */
function replaceTagsInDocument_(docId, tags) {
  const doc = DocumentApp.openById(docId);
  const body = doc.getBody();

  const entries = Object.entries(tags);

  for (const [key, rawValue] of entries) {
    const value = rawValue === null || rawValue === undefined ? "" : String(rawValue);
    const placeholder = "{{" + key + "}}";

    body.replaceText(escapeForRegex_(placeholder), value);

  }

  doc.saveAndClose();
}

/**
 * Escapes a string to be used safely inside a regular expression.
 *
 * @param {string} text - Raw text to escape.
 * @returns {string} Escaped text safe to use in a regex.
 */
function escapeForRegex_(text) {
  return text.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}

{
  "templateId": "1H1bFyR3VPI8U5CO_EDqCOOx5k_p6CFGw0HcfwyQ0vvw",
  "folderId": "1R0Izx-_pA0HYurhb25pZ2Hqd8RWOlnUG",
  "filename": "Invoice-POSTMAN-TEST-001",
  "tags": {
    "myName": "Lidia",
    "MyAddress": "Surf Camp",
    "ClientName": "Client",
    "ClientAddress": "ClientAddress",
    "Month": "November",
    "amountExcl": "120.00",
    "qty": "20",
    "Price": "100",
    "TotalTaxFree": "2000",
    "TaxRate": "20",
    "TaxTotal": "200",
    "TotalPrice": "2400"
  }
}