First commit.

.gitignore

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+.env
+.cache
+__pycache__
+playlists/*
+archive/*
+_*

get_songs.py

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+import os
+import shutil
+import threading
+from dotenv import load_dotenv
+from pydub import AudioSegment
+import spotipy
+from spotipy.oauth2 import SpotifyClientCredentials
+from spotify_dl.spotify import fetch_tracks, parse_spotify_url, validate_spotify_url
+from spotify_dl.youtube import download_songs, default_filename
+
+# setup spotify client
+load_dotenv()
+sp = spotipy.Spotify(auth_manager=SpotifyClientCredentials())
+
+# get songs, call callback at end with uuid
+def get_songs(request_url, uuid, cb):
+
+  if validate_spotify_url(request_url):
+    print(request_url)
+    # parse url
+    request_type, request_id = parse_spotify_url(request_url)
+
+    # create new songs folder for new songs
+    os.mkdir('./playlists/' + uuid)
+
+    # get songs and put in ./uuid
+    request_tracks = fetch_tracks(sp, request_type, request_url)
+
+    # download_songs(request_tracks, './' + uuid, 'bestaudio/best', False)
+    download_songs(request_tracks, './playlists/' + uuid, 'bestaudio/best', False)
+
+    # build zip named uuid.zip
+    shutil.make_archive('./archive/' + uuid, 'zip', './playlists/' + uuid)
+
+    # delete songs
+    shutil.rmtree('./playlists/' + uuid)
+
+  return cb(uuid)

main.py

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+import shutil
+import os
+import uuid
+from flask import Flask, request, send_file
+from get_songs import get_songs
+
+app = Flask(__name__, static_folder='static', static_url_path='')
+
+# serve static files
+@app.route('/')
+def homepage():
+  return app.send_static_file('index.html')
+
+# api - get songs given link
+@app.route('/api/v1/getsongs', methods=['POST'])
+def get_songs_api():
+
+  # callback when download is finished
+  def cb(file_uuid):
+
+    # get file
+    res = send_file('./archive/' + file_uuid + '.zip')
+
+    # delete file
+    os.remove('./archive/' + file_uuid + '.zip')
+
+    # return (will be sent to client)
+    return res
+
+  # returns whatever callback returns, input validated in function
+  return get_songs(request.json['link'], str(uuid.uuid4()), cb)
+
+# init
+app.run(host='0.0.0.0')

requirements.txt

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+attrs==19.3.0
+Automat==0.8.0
+blinker==1.4
+certifi==2019.11.28
+chardet==3.0.4
+charset-normalizer==2.0.12
+click==8.0.4
+cloud-init==21.4
+colorama==0.4.3
+command-not-found==0.3
+commonmark==0.9.1
+configobj==5.0.6
+constantly==15.1.0
+cryptography==2.8
+dbus-python==1.2.16
+distro==1.4.0
+distro-info===0.23ubuntu1
+entrypoints==0.3
+ffmpeg==1.4
+Flask==2.0.3
+httplib2==0.14.0
+hyperlink==19.0.0
+idna==2.8
+importlib-metadata==1.5.0
+incremental==16.10.1
+itsdangerous==2.1.1
+Jinja2==3.0.3
+jsonpatch==1.22
+jsonpointer==2.0
+jsonschema==3.2.0
+keyring==18.0.1
+language-selector==0.1
+launchpadlib==1.10.13
+lazr.restfulclient==0.14.2
+lazr.uri==1.0.3
+MarkupSafe==2.1.0
+more-itertools==4.2.0
+mutagen==1.45.1
+netifaces==0.10.4
+oauthlib==3.1.0
+pexpect==4.6.0
+pyasn1==0.4.2
+pyasn1-modules==0.2.1
+pycryptodomex==3.14.1
+pydub==0.25.1
+Pygments==2.11.2
+PyGObject==3.36.0
+PyHamcrest==1.9.0
+PyJWT==1.7.1
+pymacaroons==0.13.0
+PyNaCl==1.3.0
+pyOpenSSL==19.0.0
+pyrsistent==0.15.5
+pyserial==3.4
+python-apt==2.0.0+ubuntu0.20.4.7
+python-debian===0.1.36ubuntu1
+python-dotenv==0.19.2
+PyYAML==5.3.1
+requests==2.27.1
+requests-unixsocket==0.2.0
+rich==11.2.0
+SecretStorage==2.3.1
+sentry-sdk==1.5.6
+service-identity==18.1.0
+simplejson==3.16.0
+six==1.16.0
+sos==4.2
+spotify-dl==8.1.0
+spotipy==2.19.0
+ssh-import-id==5.10
+systemd-python==234
+Twisted==18.9.0
+ubuntu-advantage-tools==27.6
+ufw==0.36
+unattended-upgrades==0.1
+urllib3==1.26.8
+wadllib==1.3.3
+websockets==10.2
+Werkzeug==2.0.3
+youtube-dl==2021.12.17
+yt-dlp==2022.2.4
+zipp==1.0.0
+zope.interface==4.7.1

static/css/style.css

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+@font-face {
+  font-family: montserrat;
+  src: url(../fonts/Montserrat/Montserrat-VariableFont_wght.ttf);
+}
+
+@keyframes rotation {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(359deg);
+  }
+}
+
+* {
+  font-family: montserrat;
+}
+
+body {
+  background-color: #F5F5F8;
+}
+
+#title {
+  margin: 30px 30px 10px 30px;
+  font-size: 40pt;
+  color: #4D2D52;
+}
+
+#subtitle {
+  margin: 0 30px;
+  font-size: 15pt;
+  color: #4D2D52;
+  font-weight: thin;
+}
+
+#container {
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  position: absolute; 
+  text-align: center;
+  width: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+#link-input {
+  margin: 5px;
+  padding: 10px;
+  width: 50%;
+  border: 2px solid #4D2D52;
+  border-radius: 1000px;
+} 
+
+#download-button {
+  background-color: #4D2D52;
+  color: white;
+  border: 0px;
+  padding: 10px;
+  border-radius: 1000px;
+  margin: 10px;
+}
+
+#download-button:hover {
+  transform: scale(1.05)
+}
+
+#loading-icon {
+  display: inline-block;
+  animation: rotation 2s infinite linear;
+}
+
+#loading {
+  padding: 10px;
+  margin: 5px;
+  display: none;
+}
+
+#title-box {
+  display: inline-block;
+}
+
+#links {
+  margin: 70px 30px 0px 30px;
+  float: right;
+}
+
+.link {
+  margin-left: 30px;
+  top: 50pt; 
+  color: #4D2D52;
+  font-weight: bold;
+  text-decoration: none;
+  font-size: 15pt;
+}
+
+.link:hover {
+  color: #F08CAE;
+}

static/fonts/Montserrat/OFL.txt

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+Copyright 2011 The Montserrat Project Authors (https://github.com/JulietaUla/Montserrat)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.