Spotify Now Playing.js

// Variables used by Scriptable.
// These must be at the very top of the file. Do not edit.
// icon-color: deep-green; icon-glyph: headphones-alt;

/*
 * Best Looking Spotify Now Playing Widget 
 * Author: Brian Reich / reichman2
 * Version: 1.0
 * Contact: [email protected]
 * 
 * Copyright (c) 2021 Brian Reich
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

const DEBUG = false;

let fm = FileManager.iCloud() || FileManager.local();

const blur = 75; 

let prevPath = fm.joinPath(fm.documentsDirectory(), "spotify-last-played2.json");
let credsPath = fm.joinPath(fm.documentsDirectory(), "spotify-creds2.json");
let spotifyCreds = await loadSpotifyCredentials();


let widget = await createWidget();
Script.setWidget(widget);

if (config.runsInApp) {
    widget.presentSmall();
}

async function createWidget() {
    let w = new ListWidget();
    
    let nowPlaying;
    if (spotifyCreds != null) {
        w.url = "spotify://";
        nowPlaying = await loadNowPlaying();
    }
    
    debug(`nowPlaying: ${JSON.stringify(nowPlaying)}`);
  
    if (!fm.fileExists(prevPath) && nowPlaying === null) {
        
        return w;
    }
    
    
    let songTitle, songArtist, coverUrl;
    if (nowPlaying != null) {
      
        songTitle = nowPlaying.item.name.split(" (")[0];
        songArtist = nowPlaying.item.artists[0].name;

        coverUrl = nowPlaying.item.album.images[0].url;
        
        let prevSongPlayed = {
            title: songTitle,
            artist: songArtist,
            img: coverUrl
        };
        
        
        
        fm.writeString(prevPath, JSON.stringify(prevSongPlayed));
    } else {
        debug("getting prev played");
      
        let prev = JSON.parse(fm.readString(prevPath));
        
        songTitle = prev.title;
        songArtist = prev.artist;
        coverUrl = prev.img;
    }
    
    let coverImage = await loadImage(coverUrl);

    let blurredCoverImage = await blurImage(coverImage, "dark");

    w.backgroundImage = blurredCoverImage;

    let row = w.addStack();
        
    let imgStack = row.addStack();
    imgStack.layoutHorizontally();
    imgStack.size = new Size(105, 105);

    let cover = imgStack.addImage(coverImage);
    cover.cornerRadius = 6;
    imgStack.addSpacer(10);
        
    let titleText = w.addText(songTitle);
    titleText.font = Font.boldSystemFont(11);
    titleText.textColor = Color.white();
    titleText.lineLimit = 1;

    let artistText = w.addText(songArtist);
    artistText.font = Font.regularSystemFont(10);
    artistText.textColor = Color.white();
    artistText.lineLimit = 1;

    return w;
}

async function loadSpotifyCredentials() {
    let newCreds;
    if (fm.fileExists(credsPath)) {
        await fm.downloadFileFromiCloud(credsPath);
        let data = fm.readString(credsPath);
        newCreds = JSON.parse(data);
        
        debug(JSON.stringify(newCreds));
        
        if (isNotEmpty(newCreds.clientId) &&
            isNotEmpty(newCreds.clientSecret) &&
            isNotEmpty(newCreds.refreshToken)) {
//            isNotEmpty(newCreds.accessToken)) {

            return newCreds;
        }

    } else {
        let clientId, clientSecret, refreshToken;  
        
        let cidAlert = new Alert();
        cidAlert.title = "Client ID";
        cidAlert.message = "Client ID from spotify";  
        cidAlert.addTextField("Client ID");
        cidAlert.addAction("Continue");
        cidAlert.addCancelAction("Cancel");
        
        let csAlert = new Alert();
        csAlert.title = "Client Secret";
        csAlert.message = "Client Secret from spotify";  
        csAlert.addTextField("Client Secret");
        csAlert.addAction("Continue");
        csAlert.addCancelAction("Cancel");
        
        let rtAlert = new Alert();
        rtAlert.title = "Refresh Token";
        rtAlert.message = "Refresh Token from spotify";  
        rtAlert.addTextField("Refresh Token");
        rtAlert.addAction("Continue");
        rtAlert.addCancelAction("Cancel");
        
        let cidRes = await cidAlert.present();
        if (cidRes != -1) {
            clientId = cidAlert.textFieldValue(0);

            let csRes = await csAlert.present();
            if (csRes != -1) {
                clientSecret = csAlert.textFieldValue(0);
                

                let rtRes = await rtAlert.present();
                if (rtRes != -1) {
                    refreshToken = rtAlert.textFieldValue(0);
                    
                    newCreds = {
                      clientId: clientId,
                      clientSecret: clientSecret,
                      refreshToken: refreshToken,
                  };
                }
            }
        }
        
        if (!clientId || !clientSecret || !refreshToken)
            return null;
            
        
        
        
        return newCreds;
    }
}

async function loadNowPlaying(calls=0) {
    // base case for recursive call to avoid StackOverflow.
    if (calls > 5) { // just to be sure :)
        debug('calls > 5');
        return null;
    }
    
    debug('building request');
    let req = new Request("https://api.spotify.com/v1/me/player");
    req.headers = {
        "Authorization": "Bearer " + spotifyCreds.accessToken,
        "Content-Type": "application/json"
    };

    debug('about to make request');
    let res = await req.load();
    debug(`statusCode: ${req.response.statusCode}`);
    if (req.response.statusCode == 401) {
        // Access Denied -- Refresh Access Token and try again.
        if (refreshAccessToken()) {
            return await loadNowPlaying(calls + 1);
        } else {
            return null;
        }
    } else if (req.response.statusCode == 204) {
        // nothing is playing
//         debug(JSON.parse(res.toRawString()));
        return null;
    } else if (req.response.statusCode == 200) {
        return JSON.parse(res.toRawString());
    }

    return res;
}

async function refreshAccessToken() {
    debug('refreshAccessToken()');
    if (spotifyCreds != null) {
        // Create the request.
        let req = new Request("https://accounts.spotify.com/api/token");
        req.method = "POST";
        req.headers = { "Content-Type": "application/x-www-form-urlencoded" };
        req.body = "grant_type=refresh_token&refresh_token=" + spotifyCreds.refreshToken + "&client_id=" + spotifyCreds.clientId + "&client_secret=" + spotifyCreds.clientSecret;

        // Send request and await result.
        debug('Making request');
        let res;  
        await req.loadJSON().then((rs) => {
            res = rs;

            debug(`rs: ${JSON.stringify(rs)}`);
        }).catch((err) => {
            debug('stinky error: ' + err);
        });

        debug(`accessToken: ${res.access_token}`);

        spotifyCreds.accessToken = res.access_token;

        // Save the credentials to a file for later use.
        let fm = FileManager.iCloud() || FileManager.local();

        if (spotifyCreds != null)
            fm.write(credsPath, Data.fromString(JSON.stringify(spotifyCreds)));
        else {
            let alert = new Alert();
            alert.title = "Error";
            alert.message = "One ore more credentials were missing.";
            alert.addCancelAction("Done");
            alert.present();
        }

        debug('refresh successful');
        return true; // Return true if successful.
    }

    debug('refresh unsuccessful!');
    return false; // Otherwise return false. :(
}

async function loadImage(url) {
    debug(`loadImage(${url})`);
    let req = new Request(url);
    return await req.loadImage();
}

function debug(...msg) {
    if (DEBUG) {
        console.log(...msg);
    }
}

function isNotEmpty(s) {
    return s != null && s.length > 0;
}

async function blurImage(img, style) {
    const js = `
    /*
  
    StackBlur - a fast almost Gaussian Blur For Canvas
  
    Version:   0.5
    Author:    Mario Klingemann
    Contact:   [email protected]
    Website:  http://quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
    Twitter:  @quasimondo
  
    In case you find this class useful - especially in commercial projects -
    I am not totally unhappy for a small donation to my PayPal account
    [email protected]
  
    Or support me on flattr: 
    https://flattr.com/thing/72791/StackBlur-a-fast-almost-Gaussian-Blur-Effect-for-CanvasJavascript
  
    Copyright (c) 2010 Mario Klingemann
  
    Permission is hereby granted, free of charge, to any person
    obtaining a copy of this software and associated documentation
    files (the "Software"), to deal in the Software without
    restriction, including without limitation the rights to use,
    copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following
    conditions:
  
    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.
  
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    OTHER DEALINGS IN THE SOFTWARE.
    */
  
    var mul_table = [
            512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512,
            454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512,
            482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456,
            437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512,
            497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328,
            320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456,
            446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335,
            329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512,
            505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405,
            399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328,
            324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271,
            268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456,
            451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388,
            385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335,
            332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292,
            289,287,285,282,280,278,275,273,271,269,267,265,263,261,259];
          
     
    var shg_table = [
           9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 
        17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 
        19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
        20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
        21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
        21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 
        22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
        22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
        23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 
        23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 ];
  
    function stackBlurCanvasRGB( id, top_x, top_y, width, height, radius )
    {
      if ( isNaN(radius) || radius < 1 ) return;
      radius |= 0;
    
      var canvas  = document.getElementById( id );
      var context = canvas.getContext("2d");
      var imageData;
    
      try {
        try {
        imageData = context.getImageData( top_x, top_y, width, height );
        } catch(e) {
      
        // NOTE: this part is supposedly only needed if you want to work with local files
        // so it might be okay to remove the whole try/catch block and just use
        // imageData = context.getImageData( top_x, top_y, width, height );
        try {
          netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
          imageData = context.getImageData( top_x, top_y, width, height );
        } catch(e) {
          alert("Cannot access local image");
          throw new Error("unable to access local image data: " + e);
          return;
        }
        }
      } catch(e) {
        alert("Cannot access image");
        throw new Error("unable to access image data: " + e);
      }
        
      var pixels = imageData.data;
        
      var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum,
      r_out_sum, g_out_sum, b_out_sum,
      r_in_sum, g_in_sum, b_in_sum,
      pr, pg, pb, rbs;
        
      var div = radius + radius + 1;
      var w4 = width << 2;
      var widthMinus1  = width - 1;
      var heightMinus1 = height - 1;
      var radiusPlus1  = radius + 1;
      var sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2;
    
      var stackStart = new BlurStack();
      var stack = stackStart;
      for ( i = 1; i < div; i++ )
      {
        stack = stack.next = new BlurStack();
        if ( i == radiusPlus1 ) var stackEnd = stack;
      }
      stack.next = stackStart;
      var stackIn = null;
      var stackOut = null;
    
      yw = yi = 0;
    
      var mul_sum = mul_table[radius];
      var shg_sum = shg_table[radius];
    
      for ( y = 0; y < height; y++ )
      {
        r_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0;
      
        r_out_sum = radiusPlus1 * ( pr = pixels[yi] );
        g_out_sum = radiusPlus1 * ( pg = pixels[yi+1] );
        b_out_sum = radiusPlus1 * ( pb = pixels[yi+2] );
      
        r_sum += sumFactor * pr;
        g_sum += sumFactor * pg;
        b_sum += sumFactor * pb;
      
        stack = stackStart;
      
        for( i = 0; i < radiusPlus1; i++ )
        {
          stack.r = pr;
          stack.g = pg;
          stack.b = pb;
          stack = stack.next;
        }
      
        for( i = 1; i < radiusPlus1; i++ )
        {
          p = yi + (( widthMinus1 < i ? widthMinus1 : i ) << 2 );
          r_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i );
          g_sum += ( stack.g = ( pg = pixels[p+1])) * rbs;
          b_sum += ( stack.b = ( pb = pixels[p+2])) * rbs;
        
          r_in_sum += pr;
          g_in_sum += pg;
          b_in_sum += pb;
        
          stack = stack.next;
        }
      
      
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( x = 0; x < width; x++ )
        {
          pixels[yi]   = (r_sum * mul_sum) >> shg_sum;
          pixels[yi+1] = (g_sum * mul_sum) >> shg_sum;
          pixels[yi+2] = (b_sum * mul_sum) >> shg_sum;
        
          r_sum -= r_out_sum;
          g_sum -= g_out_sum;
          b_sum -= b_out_sum;
        
          r_out_sum -= stackIn.r;
          g_out_sum -= stackIn.g;
          b_out_sum -= stackIn.b;
        
          p =  ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2;
        
          r_in_sum += ( stackIn.r = pixels[p]);
          g_in_sum += ( stackIn.g = pixels[p+1]);
          b_in_sum += ( stackIn.b = pixels[p+2]);
        
          r_sum += r_in_sum;
          g_sum += g_in_sum;
          b_sum += b_in_sum;
        
          stackIn = stackIn.next;
        
          r_out_sum += ( pr = stackOut.r );
          g_out_sum += ( pg = stackOut.g );
          b_out_sum += ( pb = stackOut.b );
        
          r_in_sum -= pr;
          g_in_sum -= pg;
          b_in_sum -= pb;
        
          stackOut = stackOut.next;
  
          yi += 4;
        }
        yw += width;
      }
  
    
      for ( x = 0; x < width; x++ )
      {
        g_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0;
      
        yi = x << 2;
        r_out_sum = radiusPlus1 * ( pr = pixels[yi]);
        g_out_sum = radiusPlus1 * ( pg = pixels[yi+1]);
        b_out_sum = radiusPlus1 * ( pb = pixels[yi+2]);
      
        r_sum += sumFactor * pr;
        g_sum += sumFactor * pg;
        b_sum += sumFactor * pb;
      
        stack = stackStart;
      
        for( i = 0; i < radiusPlus1; i++ )
        {
          stack.r = pr;
          stack.g = pg;
          stack.b = pb;
          stack = stack.next;
        }
      
        yp = width;
      
        for( i = 1; i <= radius; i++ )
        {
          yi = ( yp + x ) << 2;
        
          r_sum += ( stack.r = ( pr = pixels[yi])) * ( rbs = radiusPlus1 - i );
          g_sum += ( stack.g = ( pg = pixels[yi+1])) * rbs;
          b_sum += ( stack.b = ( pb = pixels[yi+2])) * rbs;
        
          r_in_sum += pr;
          g_in_sum += pg;
          b_in_sum += pb;
        
          stack = stack.next;
      
          if( i < heightMinus1 )
          {
            yp += width;
          }
        }
      
        yi = x;
        stackIn = stackStart;
        stackOut = stackEnd;
        for ( y = 0; y < height; y++ )
        {
          p = yi << 2;
          pixels[p]   = (r_sum * mul_sum) >> shg_sum;
          pixels[p+1] = (g_sum * mul_sum) >> shg_sum;
          pixels[p+2] = (b_sum * mul_sum) >> shg_sum;
        
          r_sum -= r_out_sum;
          g_sum -= g_out_sum;
          b_sum -= b_out_sum;
        
          r_out_sum -= stackIn.r;
          g_out_sum -= stackIn.g;
          b_out_sum -= stackIn.b;
        
          p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2;
        
          r_sum += ( r_in_sum += ( stackIn.r = pixels[p]));
          g_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]));
          b_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]));
        
          stackIn = stackIn.next;
        
          r_out_sum += ( pr = stackOut.r );
          g_out_sum += ( pg = stackOut.g );
          b_out_sum += ( pb = stackOut.b );
        
          r_in_sum -= pr;
          g_in_sum -= pg;
          b_in_sum -= pb;
        
          stackOut = stackOut.next;
        
          yi += width;
        }
      }
    
      context.putImageData( imageData, top_x, top_y );
    
    }
  
    function BlurStack()
    {
      this.r = 0;
      this.g = 0;
      this.b = 0;
      this.a = 0;
      this.next = null;
    }
    
    // https://gist.github.com/mjackson/5311256
  
    function rgbToHsl(r, g, b){
        r /= 255, g /= 255, b /= 255;
        var max = Math.max(r, g, b), min = Math.min(r, g, b);
        var h, s, l = (max + min) / 2;
  
        if(max == min){
            h = s = 0; // achromatic
        }else{
            var d = max - min;
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            switch(max){
                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
                case g: h = (b - r) / d + 2; break;
                case b: h = (r - g) / d + 4; break;
            }
            h /= 6;
        }
  
        return [h, s, l];
    }
  
    function hslToRgb(h, s, l){
        var r, g, b;
  
        if(s == 0){
            r = g = b = l; // achromatic
        }else{
            var hue2rgb = function hue2rgb(p, q, t){
                if(t < 0) t += 1;
                if(t > 1) t -= 1;
                if(t < 1/6) return p + (q - p) * 6 * t;
                if(t < 1/2) return q;
                if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
                return p;
            }
  
            var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
            var p = 2 * l - q;
            r = hue2rgb(p, q, h + 1/3);
            g = hue2rgb(p, q, h);
            b = hue2rgb(p, q, h - 1/3);
        }
  
        return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
    }
    
    function lightBlur(hsl) {
    
      // Adjust the luminance.
      let lumCalc = 0.35 + (0.3 / hsl[2]);
      if (lumCalc < 1) { lumCalc = 1; }
      else if (lumCalc > 3.3) { lumCalc = 3.3; }
      const l = hsl[2] * lumCalc;
      
      // Adjust the saturation. 
      const colorful = 2 * hsl[1] * l;
      const s = hsl[1] * colorful * 1.5;
      
      return [hsl[0],s,l];
      
    }
    
    function darkBlur(hsl) {
  
      // Adjust the saturation. 
      const colorful = 2 * hsl[1] * hsl[2];
      const s = hsl[1] * (1 - hsl[2]) * 3;
      
      return [hsl[0],s,hsl[2]];
      
    }
  
    // Set up the canvas.
    const img = document.getElementById("blurImg");
    const canvas = document.getElementById("mainCanvas");
  
    const w = img.naturalWidth;
    const h = img.naturalHeight;
  
    canvas.style.width  = w + "px";
    canvas.style.height = h + "px";
    canvas.width = w;
    canvas.height = h;
  
    const context = canvas.getContext("2d");
    context.clearRect( 0, 0, w, h );
    context.drawImage( img, 0, 0 );
    
    // Get the image data from the context.
    var imageData = context.getImageData(0,0,w,h);
    var pix = imageData.data;
    
    // Set the image function, if any.
    var imageFunc;
    var style = "${style}";
    if (style == "dark") { imageFunc = darkBlur; }
    else if (style == "light") { imageFunc = lightBlur; }
  
    for (let i=0; i < pix.length; i+=4) {
  
      // Convert to HSL.
      let hsl = rgbToHsl(pix[i],pix[i+1],pix[i+2]);
      
      // Apply the image function if it exists.
      if (imageFunc) { hsl = imageFunc(hsl); }
    
      // Convert back to RGB.
      const rgb = hslToRgb(hsl[0], hsl[1], hsl[2]);
    
      // Put the values back into the data.
      pix[i] = rgb[0];
      pix[i+1] = rgb[1];
      pix[i+2] = rgb[2];
  
    }
  
    // Draw over the old image.
    context.putImageData(imageData,0,0);
  
    // Blur the image.
    stackBlurCanvasRGB("mainCanvas", 0, 0, w, h, ${blur});
    
    // Perform the additional processing for dark images.
    if (style == "dark") {
    
      // Draw the hard light box over it.
      context.globalCompositeOperation = "hard-light";
      context.fillStyle = "rgba(55,55,55,0.15)";
      context.fillRect(0, 0, w, h);
  
      // Draw the soft light box over it.
      context.globalCompositeOperation = "soft-light";
      context.fillStyle = "rgba(55,55,55,1)";
      context.fillRect(0, 0, w, h);
  
      // Draw the regular box over it.
      context.globalCompositeOperation = "source-over";
      context.fillStyle = "rgba(55,55,55,0.4)";
      context.fillRect(0, 0, w, h);
    
    // Otherwise process light images.
    } else if (style == "light") {
      context.fillStyle = "rgba(255,255,255,0.4)";
      context.fillRect(0, 0, w, h);
    }
  
    // Return a base64 representation.
    canvas.toDataURL(); 
    `
    
    // Convert the images and create the HTML.
    let blurImgData = Data.fromPNG(img).toBase64String()
    let html = `
    <img id="blurImg" src="data:image/png;base64,${blurImgData}" />
    <canvas id="mainCanvas" />
    `
    
    // Make the web view and get its return value.
    let view = new WebView()
    await view.loadHTML(html)
    let returnValue = await view.evaluateJavaScript(js)
    
    // Remove the data type from the string and convert to data.
    let imageDataString = returnValue.slice(22)
    let imageData = Data.fromBase64String(imageDataString)
    
    // Convert to image and crop before returning.
    let imageFromData = Image.fromData(imageData)
    return imageFromData;
}

How I get the Refresh Token?