258 lines
8.2 KiB
Nix
258 lines
8.2 KiB
Nix
{ config, containerCfg, pkgs, lib, builder, name, ... }:
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let
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serverCfg = config.syscfg.server;
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mediaCfg = config.syscfg.media;
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port = 8080;
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cacheControl = containerCfg.extra.cacheControl or "public, max-age=86400";
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priority = toString (containerCfg.extra.priority or 2147482647);
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logoSvgFileName = builtins.baseNameOf (toString mediaCfg.logo.svg);
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logoSvgMount = "/assets/${logoSvgFileName}";
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borderRadius = toString (containerCfg.extra.borderRadius or 8);
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hostMappings = lib.mapAttrs' (mapping: profile:
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lib.nameValuePair
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(if lib.hasInfix "." mapping then mapping else "${mapping}.${serverCfg.domain}")
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profile
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) (containerCfg.extra.mappings or {});
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traefikAssetPathRegexp =
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"^/(.*/)?"
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+ "(favicon(-[0-9]+x[0-9]+)?\\.(ico|png|svg)"
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+ "|logo\\.(ico)"
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+ "|apple-touch-icon(-precomposed)?\\.png"
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+ "|android-chrome-[0-9]+x[0-9]+\\.png"
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+ "|mstile-[0-9]+x[0-9]+\\.png)$";
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configFile = pkgs.writeText "favicon-config.json" (builtins.toJSON {
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inherit cacheControl;
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borderRadius = borderRadius;
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mappings = hostMappings;
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default = containerCfg.extra.default or null;
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});
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pythonEnv = pkgs.python3.withPackages (ps: with ps; [
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cairosvg
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pillow
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]);
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serverScript = pkgs.writeText "favicon-server.py" ''
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import base64
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import hashlib
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from io import BytesIO
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import json
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import os
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import re
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from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
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from pathlib import Path
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import cairosvg
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from PIL import Image
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CONFIG_PATH = os.environ.get("FAVICON_CONFIG", "/config/config.json")
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LOGO_PATH = os.environ.get("FAVICON_LOGO", "/assets/logo.svg")
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CACHE_DIR = Path(os.environ.get("FAVICON_CACHE_DIR", "/cache"))
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LISTEN_HOST = os.environ.get("FAVICON_LISTEN_HOST", "0.0.0.0")
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LISTEN_PORT = int(os.environ.get("FAVICON_PORT", "8080"))
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DEFAULT_CACHE_CONTROL = "public, max-age=86400"
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with open(CONFIG_PATH, "r", encoding="utf-8") as fh:
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APP_CONFIG = json.load(fh)
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with open(LOGO_PATH, "rb") as fh:
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LOGO_BYTES = fh.read()
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LOGO_HASH = hashlib.sha256(LOGO_BYTES).hexdigest()
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def _normalize_host(host):
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return (host or "").split(":", 1)[0].strip().lower()
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def _pick_profile(host):
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mappings = APP_CONFIG.get("mappings", {})
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return mappings.get(host) or APP_CONFIG.get("default")
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def _color(value, fallback):
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return value if isinstance(value, str) and value else fallback
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def _badge_text(profile):
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badge = profile.get("icon") or profile.get("label") or profile.get("text") or ""
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return str(badge).strip()
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def _tinted_logo_data_uri(color):
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svg = LOGO_BYTES.decode("utf-8")
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svg = re.sub(
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r'fill="(?!none\b)[^"]*"',
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f'fill="{color}"',
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svg,
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flags=re.IGNORECASE,
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)
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svg = re.sub(
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r"fill='(?!none\b)[^']*'",
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f"fill='{color}'",
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svg,
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flags=re.IGNORECASE,
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)
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svg = re.sub(
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r'stroke="(?!none\b)[^"]*"',
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f'stroke="{color}"',
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svg,
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flags=re.IGNORECASE,
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)
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svg = re.sub(
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r"stroke='(?!none\b)[^']*'",
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f"stroke='{color}'",
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svg,
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flags=re.IGNORECASE,
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)
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return "data:image/svg+xml;base64," + base64.b64encode(svg.encode("utf-8")).decode("ascii")
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def _border_radius():
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value = APP_CONFIG.get("borderRadius", "8")
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text = str(value).strip()
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if text.endswith("px"):
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return text
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return f"{text}px"
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def _render_svg(profile):
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bg = _color(profile.get("background"), "#111827")
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fg = _color(profile.get("foreground"), "#f8fafc")
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accent = _color(profile.get("accent"), "#38bdf8")
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badge = _badge_text(profile)
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border_radius = _border_radius()
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logo_data_uri = _tinted_logo_data_uri(fg)
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canvas = 256
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badge_svg = ""
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if badge:
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badge_svg = f"""
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<text x="196" y="72"
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font-family="DejaVu Sans, sans-serif"
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font-size="72"
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font-weight="900"
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text-anchor="middle"
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fill="{accent}">{badge}</text>
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"""
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return f"""<svg xmlns="http://www.w3.org/2000/svg" width="{canvas}" height="{canvas}" viewBox="0 0 {canvas} {canvas}">
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<rect x="0" y="0" width="{canvas}" height="{canvas}" rx="{border_radius}" ry="{border_radius}" fill="{bg}" />
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<image href="{logo_data_uri}" x="0" y="0" width="{canvas}" height="{canvas}" preserveAspectRatio="xMidYMid meet" />
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{badge_svg}
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</svg>"""
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def _cache_key(host, profile):
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payload = json.dumps(
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{"host": host, "profile": profile, "logo": LOGO_HASH},
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sort_keys=True,
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).encode("utf-8")
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return hashlib.sha256(payload).hexdigest()
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def _generate_asset(host, profile):
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cache_name = f"{_cache_key(host, profile)}.ico"
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target = CACHE_DIR / cache_name
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if target.exists():
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return target
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CACHE_DIR.mkdir(parents=True, exist_ok=True)
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svg = _render_svg(profile).encode("utf-8")
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png_bytes = cairosvg.svg2png(bytestring=svg, output_width=64, output_height=64)
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image = Image.open(BytesIO(png_bytes))
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image.save(target, format="ICO", sizes=[(64, 64)])
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image.close()
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return target
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class Handler(BaseHTTPRequestHandler):
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server_version = "favicon-router/1.0"
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def _serve(self, include_body):
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host = _normalize_host(self.headers.get("Host", ""))
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profile = _pick_profile(host)
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if not profile:
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self.send_error(404, "No favicon mapping for host")
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return
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asset_path = _generate_asset(host, profile)
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payload = asset_path.read_bytes()
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self.send_response(200)
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self.send_header("Content-Type", "image/x-icon")
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self.send_header("Content-Length", str(len(payload)))
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self.send_header("Cache-Control", APP_CONFIG.get("cacheControl", DEFAULT_CACHE_CONTROL))
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self.end_headers()
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if include_body:
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self.wfile.write(payload)
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def do_GET(self):
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self._serve(include_body=True)
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def do_HEAD(self):
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self._serve(include_body=False)
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def log_message(self, fmt, *args):
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print("%s - - [%s] %s" % (self.address_string(), self.log_date_time_string(), fmt % args))
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if __name__ == "__main__":
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httpd = ThreadingHTTPServer((LISTEN_HOST, LISTEN_PORT), Handler)
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httpd.serve_forever()
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'';
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image = pkgs.dockerTools.streamLayeredImage {
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name = "favicon";
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tag = "1";
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contents = [
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pythonEnv
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pkgs.fontconfig
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pkgs.dejavu_fonts
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pkgs.cacert
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pkgs.tzdata
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];
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config = {
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Entrypoint = [ "${pythonEnv}/bin/python3" serverScript ];
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ExposedPorts = { "${toString port}/tcp" = { }; };
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WorkingDir = "/";
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};
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};
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in {
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runtime = {
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paths = [
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{
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path = "${serverCfg.path.config}/favicon";
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mode = "0755";
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dirs = [ "cache" ];
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}
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];
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containers = {
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server = builder.mkContainer {
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imageStream = image;
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port = port;
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extraEnv = {
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FAVICON_CONFIG = "/config/config.json";
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FAVICON_LOGO = logoSvgMount;
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FAVICON_CACHE_DIR = "/cache";
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FAVICON_PORT = toString port;
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FONTCONFIG_FILE = "${pkgs.fontconfig.out}/etc/fonts/fonts.conf";
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FONTCONFIG_PATH = "${pkgs.fontconfig.out}/etc/fonts";
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};
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extraLabels = {
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"traefik.enable" = "true";
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"traefik.http.routers.${name}.entrypoints" = "web-secure";
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"traefik.http.routers.${name}.rule" = "PathRegexp(`${traefikAssetPathRegexp}`)";
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"traefik.http.routers.${name}.priority" = priority;
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"traefik.http.routers.${name}.tls" = "true";
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"traefik.http.services.${name}.loadbalancer.server.port" = toString port;
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};
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overrides = {
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volumes = [
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"${configFile}:/config/config.json:ro"
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"${serverCfg.path.config}/favicon/cache:/cache"
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"${mediaCfg.logo.svg}:${logoSvgMount}:ro"
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];
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};
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};
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};
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};
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}
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