NextcloudThemer/index.js

import fs from 'fs';
import path from 'path';
import FormData from 'form-data';
import dotenv from 'dotenv';

dotenv.config();

const instance = process.env.NEXTCLOUD_INSTANCE;
const username = process.env.NEXTCLOUD_LOGIN;
const appPassword = process.env.NEXTCLOUD_PASSWORD;
const __dirname = import.meta.dirname;

const authHeader = "Basic " + Buffer.from(`${username}:${appPassword}`).toString("base64");

function dir_project(after) {
  return path.join(__dirname, after)
}

function readDir(path, options) {
  return new Promise((res, rej) => {
    fs.readdir(path, options, (err, files) => {
      if (err) rej(err)
      else res(files)
    });
  })
}

function readFile(path, options) {
  return new Promise((res, rej) => {
    fs.readFile(path, options, (err, data) => {
      if (err) rej(err)
      else res(data)
    });
  })
}

function writeFile(path, data, options) {
  return new Promise((res, rej) => {
    fs.writeFile(path, data, options, (err, data) => {
      if (err) rej(err)
      else res(data)
    });
  })
}

function randomItem(array) {
  return array[Math.floor((Math.random() * array.length))];
}



async function updateTheming(object) {
  let kvPairs = Object.entries(object)

  for (const [setting, value] of kvPairs) {
    await fetch(`https://${instance}/apps/theming/ajax/updateStylesheet`, {
      method: "POST",
      headers: {
        "Accept": "application/json",
        "Content-Type": "application/json",
        "Authorization": authHeader,
        "OCS-APIRequest": "true"
      },
      body: JSON.stringify({ setting, value })
    });
  }
}

async function uploadImage({ image, filename, contentType }) {
  const imageBuffer = await readFile(dir_project(image))

  const form = new FormData();
  form.append('key', 'background');
  form.append('image', imageBuffer, { filename, contentType });

  const response = await fetch(`https://${instance}/apps/theming/ajax/uploadImage`, {
    method: "POST",
    headers: {
      "Accept": "application/json",
      "Authorization": authHeader,
      "OCS-APIRequest": "true",
      ...form.getHeaders()
    },
    body: form.getBuffer()
  });

  return await response.text()
}

function convertTheme(theme = "") {
  let themeData = theme.split("\n");

  return {
    theme: {
      name: themeData[0],
      slogan: themeData[1],
      primary_color: themeData[5]
    },
    background: {
      image: themeData[2],
      filename: themeData[3],
      contentType: themeData[4],
    }
  }
}

async function getTodaysTheme() {
  const directory = await readDir(dir_project("/themes/"));

  const lastTheme = await readFile(dir_project("last_theme.txt"), {
    encoding: "utf-8"
  });
  
  let themeFileName = lastTheme
  if (process.argv[2]) {
    themeFileName = process.argv[2]
  } else {
    let i = 50
    while (themeFileName == lastTheme) {
      themeFileName = randomItem(directory);
      if (i < 0) break
      i--
    }
  }

  await writeFile(dir_project("last_theme.txt"), themeFileName, {
    encoding: "utf-8"
  })

  const themeFile = await readFile(dir_project("/themes/" + themeFileName), {
    encoding: "utf-8"
  });

  const parsedTheme = convertTheme(themeFile);

  return parsedTheme
}



async function updateNextcloud() {
  const todaysTheme = await getTodaysTheme();

  await updateTheming(todaysTheme.theme);

  await uploadImage(todaysTheme.background);
}

updateNextcloud()