8b2750c413
Color is stored in participant's metadata. Using a hash of some participant's info allow to persist the color for logged-in participant without storing the color in db. Please feel free to tune the saturation and lightness range. Code is inspired by a tutorial found online.
78 lines
2.2 KiB
Python
78 lines
2.2 KiB
Python
"""
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Utils functions used in the core app
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"""
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# ruff: noqa:S311
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import json
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import random
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from typing import Optional
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from uuid import uuid4
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from django.conf import settings
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from livekit.api import AccessToken, VideoGrants
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def generate_color(identity: str) -> str:
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"""Generates a consistent HSL color based on a given identity string.
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The function seeds the random generator with the identity's hash,
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ensuring consistent color output. The HSL format allows fine-tuned control
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over saturation and lightness, empirically adjusted to produce visually
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appealing and distinct colors. HSL is preferred over hex to constrain the color
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range and ensure predictability.
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"""
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random.seed(hash(identity))
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hue = random.randint(0, 360)
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saturation = random.randint(50, 75)
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lightness = random.randint(25, 60)
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return f"hsl({hue}, {saturation}%, {lightness}%)"
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def generate_token(room: str, user, username: Optional[str] = None) -> str:
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"""Generate a LiveKit access token for a user in a specific room.
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Args:
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room (str): The name of the room.
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user (User): The user which request the access token.
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username (Optional[str]): The username to be displayed in the room.
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If none, a default value will be used.
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Returns:
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str: The LiveKit JWT access token.
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"""
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video_grants = VideoGrants(
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room=room,
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room_join=True,
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can_update_own_metadata=True,
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can_publish_sources=[
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"camera",
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"microphone",
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"screen_share",
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"screen_share_audio",
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],
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)
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if user.is_anonymous:
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identity = str(uuid4())
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default_username = "Anonymous"
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else:
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identity = str(user.sub)
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default_username = str(user)
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token = (
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AccessToken(
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api_key=settings.LIVEKIT_CONFIGURATION["api_key"],
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api_secret=settings.LIVEKIT_CONFIGURATION["api_secret"],
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)
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.with_grants(video_grants)
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.with_identity(identity)
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.with_name(username or default_username)
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.with_metadata(json.dumps({"color": generate_color(identity)}))
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)
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return token.to_jwt()
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