wip web playback

groove/cli.py

@@ -9,12 +9,12 @@ from slugify import slugify
 from rich import print
 import rich.table
 
-from groove import webserver
 from groove.shell import interactive_shell
 from groove.playlist import Playlist
 from groove import db
 from groove.db.manager import database_manager
 from groove.db.scanner import media_scanner
+from groove.webserver import webserver
 
 playlist_app = typer.Typer()
 app = typer.Typer()

groove/exceptions.py

@@ -0,0 +1,5 @@
+
+class APIHandlingException(Exception):
+    """
+    An API reqeust could not be encoded or decoded.
+    """

groove/playlist.py

@@ -35,9 +35,12 @@ class Playlist:
     @property
     def exists(self) -> bool:
         if self.deleted:
+            logging.debug("Playlist has been deleted.")
             return False
         if not self._record:
-            return (self._create_ok and self.record)
+            if self._create_ok:
+                return True and self.record
+            return False
         return True
 
     @property
@@ -163,6 +166,10 @@ class Playlist:
         if self._create_ok or create_ok:
             return self.save()
 
+    def load(self):
+        self.get_or_create(create_ok=False)
+        return self
+
     def save(self) -> Row:
         keys = {'slug': self.slug, 'name': self._name, 'description': self._description}
         stmt = db.playlist.update(keys) if self._record else db.playlist.insert(keys)

groove/webserver/requests.py

@@ -0,0 +1,39 @@
+from hashlib import blake2b
+from hmac import compare_digest
+from typing import List
+import os
+
+
+def encode(args: List, uri: str) -> str:
+    """
+    Encode a request and cryptographically sign it. This serves two purposes:
+    First, it enables the handler that receives the request to verify that the
+    request was meant for it, preventing various routing and relay-induced bugs.
+    Second, it ensures the request wasn't corrutped or tampered with during
+    transmission.
+
+    Args:
+        args (List): a list of parameters to pass along with the request.
+        uri (String): the URI of the intended handler for the request.
+
+    Returns:
+        String: A cryptographically signed request.
+    """
+    return sign(uri + '\0' + '\0'.join(args))
+
+
+def sign(request):
+    """
+    Sign a request with a cryptographic hash.  Returns the hex digest.
+    """
+    h = blake2b(digest_size=16, key=bytes(os.environ['SECRET_KEY'].encode()))
+    h.update(request.encode())
+    return h.hexdigest()
+
+
+def verify(request, digest):
+    return compare_digest(request, digest)
+
+
+def url():
+    return f"http://{os.environ['HOST']}:{os.environ['PORT']}"

groove/webserver/webserver.py

@@ -1,15 +1,19 @@
-import json
 import logging
+import json
 import os
+from pathlib import Path
 
 import bottle
-from bottle import HTTPResponse
+from bottle import HTTPResponse, template, static_file
 from bottle.ext import sqlalchemy
 
+import groove.db
 from groove.auth import is_authenticated
 from groove.db.manager import database_manager
-from groove.db import metadata
 from groove.playlist import Playlist
+from groove.webserver import requests
+
+from groove.exceptions import APIHandlingException
 
 server = bottle.Bottle()
 
@@ -23,7 +27,7 @@ def start(host: str, port: int, debug: bool) -> None:  # pragma: no cover
     with database_manager() as manager:
         server.install(sqlalchemy.Plugin(
             manager.engine,
-            metadata,
+            groove.db.metadata,
             keyword='db',
             create=True,
             commit=True,
@@ -49,16 +53,48 @@ def build():
     return "Authenticated. Groovy."
 
 
+@bottle.auth_basic(is_authenticated)
+@server.route('/build/search/playlist')
+def search_playlist(slug, db):
+    playlist = Playlist(slug=slug, session=db, create_ok=False)
+    response = json.dumps(playlist.as_dict)
+    logging.debug(response)
+    return HTTPResponse(status=200, content_type='application/json', body=response)
+
+
+@server.route('/track/<request>/<track_id>')
+def serve_track(request, track_id, db):
+
+    expected = requests.encode([track_id], '/track')
+    if not requests.verify(request, expected):
+        return HTTPResponse(status=404, body="Not found")
+
+    track_id = int(track_id)
+    track = db.query(groove.db.track).filter(
+        groove.db.track.c.id == track_id
+    ).one()
+
+    path = Path(os.environ['MEDIA_ROOT']) / Path(track['relpath'])
+    return static_file(path.name, root=path.parent)
+
+
 @server.route('/playlist/<slug>')
-def get_playlist(slug, db):
+def serve_playlist(slug, db):
     """
     Retrieve a playlist and its entries by a slug.
     """
     logging.debug(f"Looking up playlist: {slug}...")
-    playlist = Playlist(slug=slug, session=db, create_ok=False)
-    print(playlist.record)
-    if not playlist.exists:
+    playlist = Playlist(slug=slug, session=db, create_ok=False).load()
+    if not playlist.record:
+        logging.debug(f"Playist {slug} doesn't exist.")
         return HTTPResponse(status=404, body="Not found")
-    response = json.dumps(playlist.as_dict)
-    logging.debug(response)
-    return HTTPResponse(status=200, content_type='application/json', body=response)
+    logging.debug(f"Loaded {playlist.record}")
+    logging.debug(playlist.as_dict['entries'])
+
+    args = [
+        (requests.encode([str(entry['track_id'])], uri='/track'), entry['track_id'])
+        for entry in playlist.as_dict['entries']
+    ]
+
+    template_path = Path(os.environ['TEMPLATE_PATH']) / Path('playlist.tpl')
+    return template(str(template_path), url=requests.url(), playlist=playlist.as_dict, args=args)

web-templates/playlist.tpl

@@ -0,0 +1,6 @@
+<audio id="audio" preload="none" tabindex="0">
+% for sig, track_id in args:
+    <source src="/track/{{sig}}/{{track_id}}">
+% end
+    Your browser does not support HTML5 audio.
+</audio>