Tampermonkey script for DiscImg.

script.user.js

// ==UserScript==
// @name         DiscImg Upload
// @namespace    http://discimg.com/
// @version      0.1
// @description  Upload images to DiscImg.
// @author       contact@discimg.com
// @updateURL    https://gist.githubusercontent.com/headzoo/85528e64de6642457cb1675cf3d3be4b/raw/
// @downloadURL  https://gist.githubusercontent.com/headzoo/85528e64de6642457cb1675cf3d3be4b/raw/
// @match        https://discuit.net/*
// @icon         data:image/webp;base64,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
// @grant        none
// @require      https://raw.githubusercontent.com/soufianesakhi/node-creation-observer-js/master/release/node-creation-observer-latest.js
// ==/UserScript==

(async function () {
  'use strict';

  NodeCreationObserver.onCreation('.page-new-post-body', (body) => {
    const existing = document.querySelector('.discuit-image-downloader');
    if (existing) {
      existing.remove();
    }

    const downloader = document.createElement('div');
    downloader.innerHTML = `
      <div class="discuit-image-downloader">
        <div style="display: flex; align-items: center; margin-bottom: 1rem">
          <img
            src="https://discimg.com/_next/image?url=%2Flogo.png&w=32&q=75"
            alt=""
            style="width: 26px; height: 26px; border-radius: 2px; margin-right: 0.5rem"
          />
          <h3 style="font-size: 18px">DiscImg</h3>
        </div>
          <button class="discuit-image-btn" style="margin-bottom: 0.25rem;">Select Image</button>
          <div style="margin-bottom: 0.25rem;">OR</div>
          <input id="discuit-image-downloader__url" placeholder="Paste URL" />
          <div class="discuit-image-progress" style="display: none;">Uploading...</div>
          <input type="file" id="discuit-image-downloader__input" accept="image/*" />
      </div>
    `;
    body.after(downloader);

    const btn = downloader.querySelector('.discuit-image-btn');
    const progress = downloader.querySelector('.discuit-image-progress');
    const inputFile = downloader.querySelector('#discuit-image-downloader__input');
    const inputUrl = downloader.querySelector('#discuit-image-downloader__url');
    let selectionStart = 0;

    const sendFile = (formData) => {
      btn.disabled = true;
      inputUrl.disabled = true;
      progress.style.display = 'block';

      fetch('https://discimg.com/api/upload', {
        method: 'POST',
        body: formData,
      })
        .then((resp) => {
          resp.json().then((data) => {
            const img = data.urls[0];
            const textarea = document.querySelector('.page-new-post-body');
            const tab = document.querySelector('.pn-tabs-item.is-selected');
            const selected = tab.querySelector('svg').getAttribute('class');

            // Prevents discuit from undoing the textarea changes. It doesn't work
            // to simply set textarea.value = 'some value' because frontend framework
            // removes it when done that way.
            // @see https://stackoverflow.com/a/75430383
            function setNativeValue(element, value) {
              const { set: valueSetter } = Object.getOwnPropertyDescriptor(element, 'value') || {};
              const prototype = Object.getPrototypeOf(element);
              const { set: prototypeValueSetter } =
                Object.getOwnPropertyDescriptor(prototype, 'value') || {};
              if (prototypeValueSetter && valueSetter !== prototypeValueSetter) {
                prototypeValueSetter.call(element, value);
              } else if (valueSetter) {
                valueSetter.call(element, value);
              } else {
                throw new Error('The given element does not have a value setter');
              }
            }

            if (selected === 'page-new-icon-link') {
              setNativeValue(textarea, img);
            } else {
              if (selectionStart) {
                setNativeValue(
                  textarea,
                  (textarea.value =
                    textarea.value.substring(0, selectionStart) +
                    img +
                    textarea.value.substring(selectionStart)),
                );
              } else {
                setNativeValue(textarea, img + textarea.value);
              }
            }

            textarea.dispatchEvent(new Event('input', { bubbles: true }));
            selectionStart = 0;
          });
        })
        .finally(() => {
          btn.disabled = false;
          inputUrl.disabled = false;
          inputUrl.value = '';
          progress.style.display = 'none';
        });
    };

    btn.addEventListener('click', () => {
      const textarea = document.querySelector('.page-new-post-body');
      selectionStart = textarea.selectionStart;
      downloader.querySelector('#discuit-image-downloader__input').click();
    });

    inputUrl.addEventListener('input', (e) => {
      try {
        new URL(e.target.value);
      } catch {
        return;
      }

      const formData = new FormData();
      formData.append('url', e.target.value);
      sendFile(formData);
    });

    inputFile.addEventListener('change', (e) => {
      const files = e.target.files;
      if (files.length > 0) {
        const formData = new FormData();
        formData.append('files', files[0]);
        sendFile(formData);
      }
    });
  });

  function GM_addStyle(css) {
    const style =
      document.getElementById('GM_addStyleBy8626') ||
      (function () {
        const style = document.createElement('style');
        style.type = 'text/css';
        style.id = 'GM_addStyleBy8626';
        document.head.appendChild(style);
        return style;
      })();

    style.textContent = css;
  }

  GM_addStyle(`
    .discuit-image-downloader {
      border: 2px dashed #ccc;
      border-radius: 6px;
      transition: border-color 0.2s;
      padding: 20px;
      margin: 1rem;
      display: flex;
      justify-content: center;
      align-items: center;
      flex-direction: column;
    }

    .discuit-image-downloader:hover {
      border-color: #e0e0e0;
    }

    .discuit-image-downloader:focus {
        outline: 0;
        box-shadow: 0 0 0 5px rgba(255, 49, 186, 0.5);
    }

    .discuit-image-btn {
      background-color: #0297db;
      padding: 0.5rem 1rem;
      border-radius: 6px;
      transition: all 0.2s;
    }

    .discuit-image-btn:hover {
      background-color: #12a8eb;
    }

    .discuit-image-btn:focus {
        outline: 0;
        box-shadow: 0 0 0 5px rgba(3, 174, 251, 0.51);
    }

    #discuit-image-downloader__input {
      display: none;
    }
  `);
})();