@kenxirwin/alma-search/SearchBibs.js

Search ExLibris's Alma API for bibliographic records

export default class SearchBibs {
  constructor(params) {
    const expectedKeys = ['baseUrl', 'apiKey'];

    for (const key of expectedKeys) {
      if (!params.hasOwnProperty(key)) {
        throw new Error(`Missing required option: ${key}`);
      } else if (typeof params[key] !== 'string') {
        throw new Error(
          `Option ${key} must be a string; received ${typeof params[key]}`
        );
      } else if (params[key].trim() === '') {
        throw new Error(`Option ${key} cannot be an empty string`);
      } else {
        this[key] = params[key].trim();
      }
    }
  }

  /*
  idLookup -- use any of these Alma Ids:
  'mms_id', 'holdings_id', 'ie_id', 'representation_id', 
  'nz_mms_id', 'cz_mms_id', 'other_system_id',

  Accepts comma-separated values (no spaces) for multiple items
  */
  async idLookup(searchParams = {}) {
    try {
      this.validateBibParams(searchParams);
    } catch (error) {
      throw new Error(`Validation failed: ${error.message}`);
    }
    const apiPath = '/almaws/v1/bibs';
    const url = new URL(this.baseUrl + apiPath);
    for (const [key, value] of Object.entries(searchParams)) {
      if (value !== undefined && value !== null) {
        url.searchParams.set(key, value);
      }
    }

    console.log(`Request URL: ${url.toString()}`);
    return await this.executeFetch(url);
  }

  async holdingsByMmsId(mms_id) {
    const apiPath = `/almaws/v1/bibs/${mms_id}/holdings`;
    const url = new URL(this.baseUrl + apiPath);
    console.log(`Request URL: ${url.toString()}`);
    return this.executeFetch(url);
  }

  // this can be used for any Alma link -- the API key will be added
  async followLink(inputUrl) {
    const url = new URL(inputUrl);
    console.log(`Request URL: ${url.toString()}`);
    return this.executeFetch(url);
  }

  validateBibParams(params) {
    const expectOneOf = [
      'mms_id',
      'holdings_id',
      'ie_id',
      'representation_id',
      'nz_mms_id',
      'cz_mms_id',
      'other_system_id',
    ];
    let count = 0;
    for (const key of expectOneOf) {
      if (params.hasOwnProperty(key)) {
        if (typeof params[key] !== 'string') {
          throw new Error(
            `Option ${key} must be a string; received ${typeof params[key]}`
          );
        } else if (params[key].trim() === '') {
          throw new Error(`Option ${key} cannot be an empty string`);
        } else {
          this[key] = params[key].trim();
          count++;
        }
      }
    }
    if (count === 0) {
      throw new Error(
        `At least one of the following options must be provided: ${expectOneOf.join(
          ', '
        )}`
      );
    }
  }

  async barcodeLookup(barcode) {
    //accept integer or string of integers
    if (barcode.toString().match(/^\d+$/) === null) {
      throw new Error(
        `Barcode must be a string of digits; received ${barcode}`
      );
    }

    const apiPath = '/almaws/v1/items';
    const url = new URL(this.baseUrl + apiPath);
    url.searchParams.set('item_barcode', barcode);
    console.log(`Request URL: ${url.toString()}`);
    return await this.executeFetch(url);
  }

  async executeFetch(url) {
    url.searchParams.set('apikey', this.apiKey);
    console.log(`Requesting: ${url.toString()}`);
    const response = await fetch(url.toString(), {
      method: 'GET',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json',
      },
    });

    if (!response.ok) {
      const resString = JSON.stringify(response, null, 2);
      throw new Error(`Network response was not ok: (${resString})`);
    }

    const data = await response.json();
    return data;
  }
}