ja-geotiff/dist-module/source/client/fetch.js

GeoTIFF image decoding in JavaScript

import { BaseClient, BaseResponse } from "./base.js"

class FetchResponse extends BaseResponse {
  /**
   * BaseResponse facade for fetch API Response
   * @param {Response} response
   */
  constructor(response) {
    super()
    this.response = response
  }

  get status() {
    return this.response.status
  }

  getHeader(name) {
    return this.response.headers.get(name)
  }

  async getData() {
    const data = this.response.arrayBuffer
      ? await this.response.arrayBuffer()
      : (await this.response.buffer()).buffer
    return data
  }
}

export class FetchClient extends BaseClient {
  constructor(url, credentials) {
    super(url)
    this.credentials = credentials
  }

  /**
   * @param {{headers: HeadersInit, signal: AbortSignal}} [options={}]
   * @returns {Promise<FetchResponse>}
   */
  async request({ headers, signal } = {}) {
    let url = this.url
    if (Array.isArray(this.url)) {
      url = this.url[Math.floor(Math.random() * this.url.length)]
    }
    const response = await fetch(url, {
      headers,
      credentials: this.credentials,
      signal,
    })
    return new FetchResponse(response)
  }
}