Scaffold project, data model and artwork

Establish the LLeMbas foundation: FastAPI/Jinja/SQLite layout, the ORM schema, and the original SVG identity. Notable decisions, all recorded in comments at the point they matter: - No Alembic. SQLite only, schema created at startup, so models carry a few columns nothing reads yet (Message.parent_id for branching, content_parts_json for multimodal turns). Adding them later to a live database without migrations is the painful path. - Sessions are server-side rows keyed by a SHA-256 of the cookie value, not JWTs, so logout and bans revoke access immediately. - Upstream API keys are Fernet-encrypted with a key derived from LEMBAS_SECRET_KEY. decrypt() fails soft to "" so rotating the secret degrades to re-entering keys rather than crashing the admin UI. - Artwork is generated by scripts/build_artwork.py rather than hand-drawn per file: the mallorn leaf appears in the icon, favicon, lockup and banner, and one source is the only way those stay in sync. The wordmark is Source Serif 4 (OFL) converted to outlines, because a README banner cannot load a webfont and <text> would render in whatever serif the viewer happens to have. - Icons live in a template partial, not assets/, because same-document <use href="#id"> is universally supported and the cross-document form is not. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-21 10:34:48 +02:00
parent 0665027bc6
commit 5ef2af6a9f
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 # LLeMbas configuration
 # Copy to .env and edit. All variables are prefixed LEMBAS_.
 # REQUIRED. Secret used to sign session cookies and to derive the key that
 # encrypts stored API keys at rest. Generate one with:
 #   python -c "import secrets; print(secrets.token_urlsafe(48))"
 # Changing this invalidates all sessions AND makes stored API keys unreadable.
 LEMBAS_SECRET_KEY=
 # Where the SQLite database and uploaded files live.
 LEMBAS_DATA_DIR=./data
 # HTTP server bind address.
 LEMBAS_HOST=127.0.0.1
 LEMBAS_PORT=8080
 # Autoreload on code change. Development only.
 LEMBAS_RELOAD=false
 # debug | info | warning | error
 LEMBAS_LOG_LEVEL=info
 # Allow new accounts to register themselves. The very first account created is
 # always an admin, regardless of this setting. Turn off once your users exist.
 LEMBAS_ALLOW_SIGNUP=true
 # Default theme for signed-out visitors: moria (dark) or shire (light).
 LEMBAS_DEFAULT_THEME=moria
 # Seconds a login session stays valid. Default 30 days.
 LEMBAS_SESSION_TTL=2592000
 # Seconds to wait on an upstream LLM endpoint before giving up.
 LEMBAS_REQUEST_TIMEOUT=300
@@ -0,0 +1,27 @@
 # Python
 __pycache__/
 *.py[cod]
 *.egg-info/
 build/
 dist/
 .venv/
 venv/
 # Tooling
 .pytest_cache/
 .ruff_cache/
 .mypy_cache/
 # LLeMbas runtime
 .env
 data/
 *.db
 *.db-journal
 *.db-wal
 *.db-shm
 # Editors / OS
 .vscode/
 .idea/
 .DS_Store
 *.swp
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 </svg>
@@ -0,0 +1,49 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="64" height="64"
     role="img" aria-label="LLeMbas">
  <title>LLeMbas</title>
  <desc>A silver mallorn leaf laid across a scored golden lembas wafer.</desc>
  <defs>
    <linearGradient id="m-wafer" x1="0" y1="0" x2="0.3" y2="1">
      <stop offset="0" stop-color="#EACB74"/>
      <stop offset="0.5" stop-color="#C9A227"/>
      <stop offset="1" stop-color="#916F13"/>
    </linearGradient>
    <linearGradient id="m-leaf" x1="0.1" y1="1" x2="0.9" y2="0">
      <stop offset="0" stop-color="#93A5B6"/>
      <stop offset="0.4" stop-color="#F1F6FA"/>
      <stop offset="1" stop-color="#B8C7D5"/>
    </linearGradient>
    <clipPath id="m-clip">
      <rect x="6" y="6" width="52" height="52" rx="13"/>
    </clipPath>
  </defs>
  <rect x="6" y="6" width="52" height="52" rx="13" fill="url(#m-wafer)"/>
  <g clip-path="url(#m-clip)" fill="none" stroke-linecap="round">
    <g stroke="#7A5C10" stroke-opacity="0.38" stroke-width="2">
      <path d="M32 6 V58"/>
      <path d="M6 32 H58"/>
    </g>
    <g stroke="#F6E3A8" stroke-opacity="0.3" stroke-width="1">
      <path d="M33.2 6 V58"/>
      <path d="M6 33.2 H58"/>
    </g>
  </g>
  <rect x="7.1" y="7.1" width="49.8" height="49.8" rx="11.9"
        fill="none" stroke="#7A5C10" stroke-opacity="0.3" stroke-width="1.2"/>
  <g>
    <path d="M21.2 44.8 L17 49.4" stroke="#8A9AA8" stroke-width="3"
          stroke-linecap="round" fill="none"/>
    <path d="M20.5 45.5 C13.8 31.7 23.8 20.9 45.5 18.5 C49.8 35 39.8 45.8 20.5 45.5 Z" fill="url(#m-leaf)"/>
    <path d="M20.5 45.5 C28 38 36 29 45.5 18.5" fill="none" stroke="#61758A" stroke-opacity="0.5"
          stroke-width="1.5" stroke-linecap="round"/>
    <g fill="none" stroke="#61758A" stroke-opacity="0.32"
       stroke-width="1" stroke-linecap="round">
      <path d="M26.9 38.8 Q25.2 35.8 24.9 32.1"/>
      <path d="M32.3 33.1 Q30.9 30.3 30.4 26.9"/>
      <path d="M37.8 27.0 Q36.6 24.6 36.3 21.7"/>
      <path d="M26.9 38.8 Q30.5 40.1 33.7 40.3"/>
      <path d="M32.3 33.1 Q35.8 34.3 38.6 34.5"/>
      <path d="M37.8 27.0 Q40.8 27.9 43.2 28.1"/>
    </g>
  </g>
 </svg>
@@ -0,0 +1,23 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 544.03 112.09"
     width="544.03" height="112.09" role="img" aria-label="LLeMbas">
  <title>LLeMbas</title>
  <!-- Source Serif 4 (SIL OFL 1.1) outlines. The capitals L, L and M spell out
       LLM and take the accent colour; see scripts/build_artwork.py. -->
  <style>
    .base { fill: var(--lembas-ink, #1B1F23); }
    .accent { fill: var(--lembas-gold, #C9A227); }
    @media (prefers-color-scheme: dark) {
      .base { fill: var(--lembas-ink, #EDE6D6); }
      .accent { fill: var(--lembas-gold, #E0B252); }
    }
  </style>
  <g transform="translate(-5.07 110.15)">
    <path class="accent" data-char="L" d="M5.07 -96.27 16.12 -94.93C16.57 -83.13 16.57 -66.87 16.57 -53.28V-46.72C16.57 -32.84 16.57 -16.12 16.12 -4.18L5.07 -2.84V0.00H71.64L73.43 -29.10H70.60L61.19 -3.73H32.54C32.09 -15.52 31.94 -32.54 31.94 -46.72V-53.28C31.94 -66.87 32.09 -83.13 32.54 -94.93L43.43 -96.27V-99.10H5.07Z"/>
    <path class="accent" data-char="L" d="M82.09 -96.27 93.13 -94.93C93.58 -83.13 93.58 -66.87 93.58 -53.28V-46.72C93.58 -32.84 93.58 -16.12 93.13 -4.18L82.09 -2.84V0.00H148.66L150.45 -29.10H147.61L138.21 -3.73H109.55C109.10 -15.52 108.96 -32.54 108.96 -46.72V-53.28C108.96 -66.87 109.10 -83.13 109.55 -94.93L120.45 -96.27V-99.10H82.09Z"/>
    <path class="base" data-char="e" d="M191.04 -66.27C198.66 -66.27 203.73 -60.30 203.73 -49.10C203.73 -42.54 201.49 -40.30 194.63 -40.30H175.07C176.12 -59.40 183.43 -66.27 191.04 -66.27ZM191.19 1.94C202.39 1.94 211.79 -3.13 217.16 -14.63L215.07 -16.12C210.60 -10.60 204.78 -7.01 196.72 -7.01C184.18 -7.01 174.93 -17.61 174.93 -35.67V-36.87H215.97C216.57 -38.96 216.87 -40.75 216.87 -44.03C216.87 -59.55 206.12 -69.85 190.90 -69.85C174.33 -69.85 159.70 -55.97 159.70 -32.69C159.70 -10.75 173.58 1.94 191.19 1.94Z"/>
    <path class="accent" data-char="M" d="M228.21 0.00H256.12V-2.84L244.18 -4.18V-87.31L275.22 0.00H280.75L311.79 -88.36V-46.72C311.79 -32.84 311.64 -15.97 311.19 -4.18L301.04 -2.84V0.00H338.66V-2.84L327.76 -4.18C327.31 -15.97 327.16 -32.84 327.16 -46.72V-53.28C327.16 -66.87 327.31 -83.13 327.76 -94.93L338.66 -96.27V-99.10H311.19L283.73 -22.09L256.57 -99.10H228.21V-96.27L239.85 -94.78V-4.18L228.21 -2.84Z"/>
    <path class="base" data-char="b" d="M348.66 0.00 372.84 1.64V-9.25C377.91 -1.19 384.63 1.94 391.94 1.94C407.91 1.94 419.85 -11.94 419.85 -35.67C419.85 -58.21 408.36 -69.85 393.43 -69.85C384.33 -69.85 377.31 -64.78 372.84 -57.16V-78.81L373.43 -108.66L371.79 -110.15L348.06 -103.88V-101.49L358.36 -99.10V-31.04C358.36 -23.28 358.21 -12.39 357.91 -4.18L348.66 -2.84ZM387.16 -62.24C397.01 -62.24 404.48 -54.18 404.48 -34.78C404.48 -14.93 396.87 -5.82 387.46 -5.82C381.49 -5.82 377.61 -7.61 372.84 -12.69V-53.88C376.87 -58.96 381.64 -62.24 387.16 -62.24Z"/>
    <path class="base" data-char="a" d="M481.49 1.64C488.21 1.64 492.39 -2.09 494.63 -7.46L492.84 -8.96C490.45 -6.27 489.10 -5.22 486.87 -5.22C484.33 -5.22 482.84 -6.87 482.84 -11.64V-44.93C482.84 -62.24 475.97 -69.85 460.75 -69.85C445.67 -69.85 434.93 -62.84 433.28 -52.69C434.03 -48.66 435.97 -46.42 440.00 -46.42C444.03 -46.42 447.46 -49.10 448.21 -55.52L449.85 -64.93C451.79 -65.52 453.58 -65.82 455.67 -65.82C464.78 -65.82 468.21 -61.19 468.21 -46.57V-41.34C462.54 -40.00 457.76 -38.66 454.48 -37.46C435.82 -31.49 430.75 -24.18 430.75 -14.93C430.75 -4.03 438.36 1.94 448.36 1.94C456.12 1.94 462.39 -0.90 468.36 -8.66C469.40 -2.09 473.73 1.64 481.49 1.64ZM445.07 -18.36C445.07 -24.93 448.06 -30.30 458.21 -34.78C460.15 -35.67 463.58 -36.87 468.21 -38.36V-11.64C463.28 -7.61 460.00 -6.72 455.52 -6.72C449.55 -6.72 445.07 -10.15 445.07 -18.36Z"/>
    <path class="base" data-char="s" d="M523.43 1.94C540.00 1.94 549.10 -6.42 549.10 -19.40C549.10 -31.49 540.15 -35.97 531.34 -39.70L527.16 -41.49C519.85 -44.63 513.58 -47.91 513.58 -55.37C513.58 -61.94 518.36 -66.57 526.72 -66.57C530.45 -66.57 533.43 -66.12 536.12 -64.78L542.54 -47.31H545.07L545.67 -64.63C539.85 -68.06 534.18 -69.85 526.72 -69.85C510.75 -69.85 502.69 -60.90 502.69 -49.25C502.69 -37.46 511.19 -32.84 519.70 -29.25L523.88 -27.46C531.19 -24.33 537.61 -21.19 537.61 -13.58C537.61 -6.42 532.54 -1.19 523.43 -1.19C518.81 -1.19 515.52 -1.79 512.24 -2.99L505.52 -22.24H503.13L502.24 -3.73C508.96 0.00 515.07 1.94 523.43 1.94Z"/>
  </g>
 </svg>
@@ -0,0 +1,66 @@
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 [project]
 name = "lembas"
 version = "0.1.0"
 description = "LLeMbas - a Middle-earth themed web UI for OpenAI-compatible LLM endpoints"
 readme = "README.md"
 requires-python = ">=3.11"
 license = { file = "LICENSE" }
 authors = [{ name = "Jaroslav Benes", email = "admin@ecoposta.sk" }]
 keywords = ["llm", "webui", "openai", "chat", "self-hosted"]
 classifiers = [
    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
    "Programming Language :: Python :: 3",
    "Topic :: Communications :: Chat",
 ]
 dependencies = [
    "fastapi>=0.115",
    "uvicorn[standard]>=0.32",
    "jinja2>=3.1",
    "sqlalchemy>=2.0",
    "pydantic>=2.9",
    "pydantic-settings>=2.6",
    "httpx>=0.27",
    "python-multipart>=0.0.12",
    "argon2-cffi>=23.1",
    "cryptography>=43.0",
    "markdown-it-py>=3.0",
    "mdit-py-plugins>=0.4",
    "pygments>=2.18",
    "nh3>=0.2.18",
    "typer>=0.12",
 ]
 [project.optional-dependencies]
 dev = [
    "pytest>=8.3",
    "pytest-asyncio>=0.24",
    "ruff>=0.7",
 ]
 [project.scripts]
 lembas = "lembas.cli:app"
 [project.urls]
 Homepage = "https://github.com/homer/LLeMbas"
 [tool.hatch.build.targets.wheel]
 packages = ["src/lembas"]
 [tool.ruff]
 line-length = 100
 target-version = "py311"
 src = ["src", "tests"]
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP", "B", "SIM", "C4"]
 ignore = ["B008"]  # FastAPI Depends() in defaults is idiomatic
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 asyncio_mode = "auto"
 filterwarnings = ["ignore::DeprecationWarning"]
@@ -0,0 +1,473 @@
 #!/usr/bin/env python3
 """Generate every LLeMbas SVG asset from one source of truth.
 Why a generator rather than five hand-written files: the leaf mark appears in
 the icon, the favicon, the lockup and the banner. Keeping the geometry in one
 place is the only way those stay identical as the mark is tuned.
 Why the wordmark is outlines and not <text>: a README banner on GitHub or Gitea
 cannot load a webfont, so <text> would render in whatever serif the viewer
 happens to have. Outlines look the same everywhere. Letterforms come from
 Source Serif 4 (Adobe, SIL OFL 1.1); only the handful of glyphs actually used
 are extracted, as a static drawing -- no font binary is redistributed.
 This is a design-time tool. The application never imports it, and the generated
 files are committed. Re-run it only when the artwork itself changes:
    pip install fonttools
    python scripts/build_artwork.py
 """
 from __future__ import annotations
 import argparse
 import random
 import sys
 from pathlib import Path
 try:
    from fontTools.pens.boundsPen import BoundsPen
    from fontTools.pens.svgPathPen import SVGPathPen
    from fontTools.pens.transformPen import TransformPen
    from fontTools.ttLib import TTFont
 except ImportError:  # pragma: no cover - design-time tool
    sys.exit("fontTools is required for this script: pip install fonttools")
 ROOT = Path(__file__).resolve().parent.parent
 ASSETS = ROOT / "assets"
 FONT_SEMIBOLD = Path("/usr/share/fonts/adobe-source-serif/SourceSerif4Display-Semibold.otf")
 FONT_ITALIC = Path("/usr/share/fonts/adobe-source-serif/SourceSerif4Display-It.otf")
 WORDMARK = "LLeMbas"
 TAGLINE = "Waybread for the long road of thought"
 # The capitals of LLeMbas spell LLM. Those three glyphs carry the accent colour.
 ACCENT_GLYPHS = frozenset({0, 1, 3})
 # --- Palette -----------------------------------------------------------------
 GOLD_LIGHT = "#EACB74"
 GOLD = "#C9A227"
 GOLD_DARK = "#916F13"
 GOLD_SCORE = "#7A5C10"
 GOLD_HILIGHT = "#F6E3A8"
 RUNE_GOLD = "#E0B252"
 LEAF_EDGE = "#93A5B6"
 LEAF_LIGHT = "#F1F6FA"
 LEAF_MID = "#B8C7D5"
 LEAF_VEIN = "#61758A"
 LEAF_STEM = "#8A9AA8"
 NIGHT_TOP = "#080B0F"
 NIGHT_MID = "#101822"
 NIGHT_LOW = "#1A2530"
 PARCHMENT = "#EDE6D6"
 INK = "#1B1F23"
 MUTED = "#9AA7B4"
 # --- The mallorn leaf --------------------------------------------------------
 # Drawn once, in a 64x64 box, and reused everywhere. Tuned so the silhouette
 # still reads as a leaf at 16px, where veins and score lines disappear.
 LEAF_BLADE = (
    "M20.5 45.5 C13.8 31.7 23.8 20.9 45.5 18.5 C49.8 35 39.8 45.8 20.5 45.5 Z"
 )
 LEAF_MIDRIB = "M20.5 45.5 C28 38 36 29 45.5 18.5"
 LEAF_STEM_PATH = "M21.2 44.8 L17 49.4"
 LEAF_VEINS = [
    "M26.9 38.8 Q25.2 35.8 24.9 32.1",
    "M32.3 33.1 Q30.9 30.3 30.4 26.9",
    "M37.8 27.0 Q36.6 24.6 36.3 21.7",
    "M26.9 38.8 Q30.5 40.1 33.7 40.3",
    "M32.3 33.1 Q35.8 34.3 38.6 34.5",
    "M37.8 27.0 Q40.8 27.9 43.2 28.1",
 ]
 HEADER = '<svg xmlns="http://www.w3.org/2000/svg"'
 # --- Type --------------------------------------------------------------------
 class TextRun:
    """A string converted to SVG outlines, positioned with the baseline at y=0."""
    def __init__(self, font_path: Path, text: str, cap_px: float):
        if not font_path.exists():
            sys.exit(f"font not found: {font_path}")
        font = TTFont(font_path)
        cmap = font.getBestCmap()
        glyph_set = font.getGlyphSet()
        hmtx = font["hmtx"]
        # Scale to cap height rather than em size: it is what the eye measures.
        cap_height = getattr(font["OS/2"], "sCapHeight", None) or font["head"].unitsPerEm * 0.7
        scale = cap_px / cap_height
        self.glyphs: list[dict] = []
        pen_x = 0.0
        x0 = y0 = float("inf")
        x1 = y1 = float("-inf")
        for index, char in enumerate(text):
            if char == " ":
                pen_x += hmtx[cmap[ord(" ")]][0] * scale
                continue
            name = cmap.get(ord(char))
            if name is None:
                sys.exit(f"{font_path.name} has no glyph for {char!r}")
            # Font coordinates run upwards; SVG's run downwards, hence -scale.
            transform = (scale, 0, 0, -scale, pen_x, 0)
            svg_pen = SVGPathPen(glyph_set, ntos=lambda v: f"{v:.2f}")
            glyph_set[name].draw(TransformPen(svg_pen, transform))
            bounds_pen = BoundsPen(glyph_set)
            glyph_set[name].draw(TransformPen(bounds_pen, transform))
            if bounds_pen.bounds:
                gx0, gy0, gx1, gy1 = bounds_pen.bounds
                x0, y0 = min(x0, gx0), min(y0, gy0)
                x1, y1 = max(x1, gx1), max(y1, gy1)
            self.glyphs.append(
                {"char": char, "index": index, "path": svg_pen.getCommands()}
            )
            pen_x += hmtx[name][0] * scale
        self.x0, self.y0, self.x1, self.y1 = x0, y0, x1, y1
        self.width = x1 - x0
        self.height = y1 - y0
    def paths(
        self,
        accent_indices: frozenset[int] = frozenset(),
        *,
        indent: str = "  ",
        base_class: str = "base",
        accent_class: str = "accent",
    ) -> str:
        """Render the glyphs, offset so the run's left edge sits at x=0.
        Class names are caller-supplied because <style> inside an SVG is scoped
        to the whole document, not to the group it sits in. Two runs in one file
        sharing a class name means the second rule silently recolours the first.
        """
        out = []
        for glyph in self.glyphs:
            cls = accent_class if glyph["index"] in accent_indices else base_class
            out.append(
                f'{indent}<path class="{cls}" data-char="{glyph["char"]}" '
                f'd="{glyph["path"]}"/>'
            )
        return "\n".join(out)
    @property
    def origin_shift(self) -> str:
        """Transform placing the run's top-left at the current origin."""
        return f"translate({-self.x0:.2f} {-self.y0:.2f})"
 def type_style(indent: str = "    ") -> str:
    """Colour rules for outlined type.
    The CSS variables let the application theme the type when the SVG is
    inlined into a page. The literal fallbacks matter just as much: opened as a
    standalone file or loaded through <img>, no page CSS reaches the document,
    so the media query is the only thing keeping the wordmark legible on a dark
    background.
    """
    return f"""{indent}<style>
 {indent}  .base {{ fill: var(--lembas-ink, {INK}); }}
 {indent}  .accent {{ fill: var(--lembas-gold, {GOLD}); }}
 {indent}  @media (prefers-color-scheme: dark) {{
 {indent}    .base {{ fill: var(--lembas-ink, {PARCHMENT}); }}
 {indent}    .accent {{ fill: var(--lembas-gold, {RUNE_GOLD}); }}
 {indent}  }}
 {indent}</style>"""
 # --- The mark ----------------------------------------------------------------
 def mark_defs(prefix: str) -> str:
    return f"""  <defs>
    <linearGradient id="{prefix}-wafer" x1="0" y1="0" x2="0.3" y2="1">
      <stop offset="0" stop-color="{GOLD_LIGHT}"/>
      <stop offset="0.5" stop-color="{GOLD}"/>
      <stop offset="1" stop-color="{GOLD_DARK}"/>
    </linearGradient>
    <linearGradient id="{prefix}-leaf" x1="0.1" y1="1" x2="0.9" y2="0">
      <stop offset="0" stop-color="{LEAF_EDGE}"/>
      <stop offset="0.4" stop-color="{LEAF_LIGHT}"/>
      <stop offset="1" stop-color="{LEAF_MID}"/>
    </linearGradient>
    <clipPath id="{prefix}-clip">
      <rect x="6" y="6" width="52" height="52" rx="13"/>
    </clipPath>
  </defs>"""
 def mark_body(prefix: str, *, detail: bool = True) -> str:
    """The wafer-and-leaf mark in a 64x64 box.
    detail=False drops the score lines, rim and veins for small-size use.
    """
    parts = [f'  <rect x="6" y="6" width="52" height="52" rx="13" fill="url(#{prefix}-wafer)"/>']
    if detail:
        parts.append(f"""  <g clip-path="url(#{prefix}-clip)" fill="none" stroke-linecap="round">
    <g stroke="{GOLD_SCORE}" stroke-opacity="0.38" stroke-width="2">
      <path d="M32 6 V58"/>
      <path d="M6 32 H58"/>
    </g>
    <g stroke="{GOLD_HILIGHT}" stroke-opacity="0.3" stroke-width="1">
      <path d="M33.2 6 V58"/>
      <path d="M6 33.2 H58"/>
    </g>
  </g>
  <rect x="7.1" y="7.1" width="49.8" height="49.8" rx="11.9"
        fill="none" stroke="{GOLD_SCORE}" stroke-opacity="0.3" stroke-width="1.2"/>""")
    parts.append(f"""  <g>
    <path d="{LEAF_STEM_PATH}" stroke="{LEAF_STEM}" stroke-width="3"
          stroke-linecap="round" fill="none"/>
    <path d="{LEAF_BLADE}" fill="url(#{prefix}-leaf)"/>
    <path d="{LEAF_MIDRIB}" fill="none" stroke="{LEAF_VEIN}" stroke-opacity="0.5"
          stroke-width="1.5" stroke-linecap="round"/>""")
    if detail:
        veins = "\n".join(f'      <path d="{v}"/>' for v in LEAF_VEINS)
        parts.append(f"""    <g fill="none" stroke="{LEAF_VEIN}" stroke-opacity="0.32"
       stroke-width="1" stroke-linecap="round">
 {veins}
    </g>""")
    parts.append("  </g>")
    return "\n".join(parts)
 # --- Asset builders ----------------------------------------------------------
 def build_logo_mark() -> str:
    return f"""{HEADER} viewBox="0 0 64 64" width="64" height="64"
     role="img" aria-label="LLeMbas">
  <title>LLeMbas</title>
  <desc>A silver mallorn leaf laid across a scored golden lembas wafer.</desc>
 {mark_defs("m")}
 {mark_body("m")}
 </svg>
 """
 def build_favicon() -> str:
    """Small-size variant: no score lines or veins, larger blade, tighter tile."""
    return f"""{HEADER} viewBox="0 0 64 64" width="64" height="64"
     role="img" aria-label="LLeMbas">
  <title>LLeMbas</title>
 {mark_defs("f")}
  <rect x="2" y="2" width="60" height="60" rx="14" fill="url(#f-wafer)"/>
  <g transform="translate(32 32) scale(1.16) translate(-32 -32)">
    <path d="M20.6 44.6 L15.6 50.1" stroke="{LEAF_STEM}" stroke-width="3.4"
          stroke-linecap="round" fill="none"/>
    <path d="{LEAF_BLADE}" fill="url(#f-leaf)"/>
    <path d="{LEAF_MIDRIB}" fill="none" stroke="{LEAF_VEIN}" stroke-opacity="0.45"
          stroke-width="1.8" stroke-linecap="round"/>
  </g>
 </svg>
 """
 def build_wordmark() -> str:
    """Standalone type. Inherits colour so it can sit on any background."""
    run = TextRun(FONT_SEMIBOLD, WORDMARK, 100)
    return f"""{HEADER} viewBox="0 0 {run.width:.2f} {run.height:.2f}"
     width="{run.width:.2f}" height="{run.height:.2f}" role="img" aria-label="LLeMbas">
  <title>LLeMbas</title>
  <!-- Source Serif 4 (SIL OFL 1.1) outlines. The capitals L, L and M spell out
       LLM and take the accent colour; see scripts/build_artwork.py. -->
 {type_style("  ")}
  <g transform="{run.origin_shift}">
 {run.paths(ACCENT_GLYPHS, indent="    ")}
  </g>
 </svg>
 """
 def build_lockup() -> str:
    """Horizontal mark + wordmark, for the application header."""
    cap = 46.0
    run = TextRun(FONT_SEMIBOLD, WORDMARK, cap)
    mark_size = 64.0
    gap = 20.0
    pad = 4.0
    height = mark_size + pad * 2
    text_x = pad + mark_size + gap
    # Optically centre on the cap height rather than the full glyph bounds, so
    # the ascender of "b" and the overshoot of "e" do not shift the baseline.
    baseline_y = height / 2 + cap / 2
    width = text_x + run.width + pad
    return f"""{HEADER} viewBox="0 0 {width:.2f} {height:.2f}"
     width="{width:.2f}" height="{height:.2f}" role="img" aria-label="LLeMbas">
  <title>LLeMbas</title>
 {mark_defs("l")}
 {type_style("  ")}
  <g transform="translate({pad} {pad})">
 {mark_body("l")}
  </g>
  <g transform="translate({text_x - run.x0:.2f} {baseline_y:.2f})">
 {run.paths(ACCENT_GLYPHS, indent="    ")}
  </g>
 </svg>
 """
 def _mountains(width: float, base_y: float, seed: int, height: float, colour: str) -> str:
    """One jagged ridge line spanning the full width."""
    rng = random.Random(seed)
    points = [(0.0, base_y)]
    x = 0.0
    while x < width:
        step = rng.uniform(width * 0.045, width * 0.11)
        x = min(x + step, width)
        peak = base_y - rng.uniform(height * 0.35, height)
        points.append((x, peak))
        # A short shoulder after each peak keeps the ridge from looking like a saw.
        if x < width:
            x = min(x + rng.uniform(width * 0.01, width * 0.03), width)
            points.append((x, peak + rng.uniform(height * 0.08, height * 0.25)))
    points.append((width, base_y))
    coords = " ".join(f"{px:.1f},{py:.1f}" for px, py in points)
    return f'  <polygon points="{coords} {width:.0f},999 0,999" fill="{colour}"/>'
 def _stars(width: float, height: float, count: int, seed: int) -> str:
    rng = random.Random(seed)
    out = []
    for _ in range(count):
        sx = rng.uniform(0, width)
        sy = rng.uniform(0, height)
        r = rng.uniform(0.6, 1.9)
        opacity = rng.uniform(0.18, 0.85)
        out.append(
            f'    <circle cx="{sx:.1f}" cy="{sy:.1f}" r="{r:.2f}" opacity="{opacity:.2f}"/>'
        )
    return "\n".join(out)
 def _drifting_leaves(seed: int) -> str:
    """A few mallorn leaves adrift in the sky, well behind the type."""
    rng = random.Random(seed)
    placements = [
        (120, 90, 0.42, -18), (250, 250, 0.30, 24), (1035, 95, 0.36, 12),
        (1160, 215, 0.46, -32), (905, 300, 0.26, 40), (185, 300, 0.24, -8),
    ]
    out = []
    for cx, cy, scale, rot in placements:
        opacity = rng.uniform(0.10, 0.19)
        out.append(
            f'    <g transform="translate({cx} {cy}) rotate({rot}) '
            f'scale({scale}) translate(-32 -32)" opacity="{opacity:.2f}">'
            f'<path d="{LEAF_BLADE}" fill="{RUNE_GOLD}"/></g>'
        )
    return "\n".join(out)
 def build_banner() -> str:
    """README hero.
    Carries its own dark background rather than relying on the page, because a
    README is rendered on a light background as often as a dark one.
    """
    width, height = 1280.0, 420.0
    cap = 92.0
    run = TextRun(FONT_SEMIBOLD, WORDMARK, cap)
    tag = TextRun(FONT_ITALIC, TAGLINE, 26.0)
    mark_size = 136.0
    gap = 34.0
    lockup_w = mark_size + gap + run.width
    lockup_x = (width - lockup_w) / 2
    baseline_y = 232.0
    mark_y = baseline_y - cap / 2 - mark_size / 2
    tag_x = (width - tag.width) / 2 - tag.x0
    tag_y = baseline_y + 68.0
    mark_scale = mark_size / 64.0
    return f"""{HEADER} viewBox="0 0 {width:.0f} {height:.0f}"
     width="{width:.0f}" height="{height:.0f}" role="img"
     aria-label="LLeMbas - {TAGLINE}">
  <title>LLeMbas</title>
  <desc>{TAGLINE}. A mallorn leaf and wafer above the mountains at night.</desc>
  <defs>
    <linearGradient id="b-sky" x1="0" y1="0" x2="0" y2="1">
      <stop offset="0" stop-color="{NIGHT_TOP}"/>
      <stop offset="0.62" stop-color="{NIGHT_MID}"/>
      <stop offset="1" stop-color="{NIGHT_LOW}"/>
    </linearGradient>
    <radialGradient id="b-glow" cx="0.5" cy="0.54" r="0.5">
      <stop offset="0" stop-color="{GOLD}" stop-opacity="0.22"/>
      <stop offset="1" stop-color="{GOLD}" stop-opacity="0"/>
    </radialGradient>
    <!-- Cool light sitting just above the ridge line, so the far mountains
         separate from the near ones instead of merging into one dark mass. -->
    <radialGradient id="b-horizon" cx="0.5" cy="1" r="0.72">
      <stop offset="0" stop-color="#4E6C86" stop-opacity="0.30"/>
      <stop offset="1" stop-color="#4E6C86" stop-opacity="0"/>
    </radialGradient>
 {mark_defs("b").removeprefix("  <defs>").removesuffix("  </defs>").rstrip()}
  </defs>
  <rect width="{width:.0f}" height="{height:.0f}" fill="url(#b-sky)"/>
  <g fill="#FFFFFF">
 {_stars(width, 300, 130, 11)}
  </g>
  <rect y="180" width="{width:.0f}" height="240" fill="url(#b-horizon)"/>
  <rect width="{width:.0f}" height="{height:.0f}" fill="url(#b-glow)"/>
 {_drifting_leaves(5)}
  <!-- Ridge lines, furthest first. Each is lighter than the one in front of it,
       which is what reads as distance. -->
 {_mountains(width, 366, 3, 150, "#1C2836")}
 {_mountains(width, 392, 8, 112, "#111A25")}
 {_mountains(width, 416, 21, 74, "#080D13")}
  <rect y="{height - 5:.0f}" width="{width:.0f}" height="5" fill="{GOLD}" opacity="0.55"/>
  <!-- Lockup. Colours are fixed rather than themed: the banner carries its own
       night sky, so it must not follow the reader's colour scheme. -->
  <g transform="translate({lockup_x:.2f} {mark_y:.2f}) scale({mark_scale:.4f})">
 {mark_body("b")}
  </g>
  <g transform="translate({lockup_x + mark_size + gap - run.x0:.2f} {baseline_y:.2f})">
    <style>.base {{ fill: {PARCHMENT}; }} .accent {{ fill: {RUNE_GOLD}; }}</style>
 {run.paths(ACCENT_GLYPHS, indent="    ")}
  </g>
  <g transform="translate({tag_x:.2f} {tag_y:.2f})">
    <style>.tag {{ fill: {MUTED}; }}</style>
 {tag.paths(indent="    ", base_class="tag")}
  </g>
 </svg>
 """
 # --- Entry point -------------------------------------------------------------
 BUILDERS = {
    "logo-mark.svg": build_logo_mark,
    "favicon.svg": build_favicon,
    "wordmark.svg": build_wordmark,
    "logo-lockup.svg": build_lockup,
    "banner.svg": build_banner,
 }
 def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--out", type=Path, default=ASSETS)
    parser.add_argument("--only", nargs="*", choices=sorted(BUILDERS), default=None)
    args = parser.parse_args()
    args.out.mkdir(parents=True, exist_ok=True)
    for filename in args.only or BUILDERS:
        path = args.out / filename
        path.write_text(BUILDERS[filename](), encoding="utf-8")
        print(f"wrote {path.relative_to(ROOT)} ({path.stat().st_size:,} bytes)")
 if __name__ == "__main__":
    main()
@@ -0,0 +1,3 @@
 """LLeMbas - a Middle-earth themed web UI for OpenAI-compatible LLM endpoints."""
 __version__ = "0.1.0"
@@ -0,0 +1,91 @@
 """Shared FastAPI dependencies: database sessions and the current user."""
 from __future__ import annotations
 from collections.abc import Iterator
 from typing import Annotated
 from fastapi import Depends, HTTPException, Request, status
 from fastapi.responses import RedirectResponse
 from sqlalchemy.orm import Session as DBSession
 from lembas.db.models import User
 from lembas.db.session import get_session_factory
 from lembas.security.sessions import COOKIE_NAME, resolve_session
 def get_db() -> Iterator[DBSession]:
    """One database session per request, always closed."""
    session = get_session_factory()()
    try:
        yield session
    finally:
        session.close()
 Db = Annotated[DBSession, Depends(get_db)]
 def get_current_user(request: Request, db: Db) -> User | None:
    """Resolve the session cookie to a user, or None when signed out.
    Cached on request.state so several dependencies in one request do not each
    hit the sessions table.
    """
    cached = getattr(request.state, "user", None)
    if cached is not None:
        return cached
    user = resolve_session(db, request.cookies.get(COOKIE_NAME))
    request.state.user = user
    return user
 CurrentUser = Annotated[User | None, Depends(get_current_user)]
 class RedirectToLogin(HTTPException):
    """Signals "not signed in" so the exception handler can redirect a browser.
    Raised instead of returning a response because dependencies cannot return
    one. lembas.main turns this into a 303 for page loads and an HX-Redirect
    header for HTMX requests, so a partial swap never renders a login form
    inside the chat pane.
    """
    def __init__(self, next_url: str = "/") -> None:
        super().__init__(status_code=status.HTTP_401_UNAUTHORIZED, detail="Sign in required")
        self.next_url = next_url
 def require_user(request: Request, user: CurrentUser) -> User:
    if user is None:
        raise RedirectToLogin(next_url=request.url.path)
    return user
 RequiredUser = Annotated[User, Depends(require_user)]
 def require_admin(user: RequiredUser) -> User:
    if not user.is_admin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="This area is restricted to administrators.",
        )
    return user
 AdminUser = Annotated[User, Depends(require_admin)]
 def is_htmx(request: Request) -> bool:
    return request.headers.get("HX-Request") == "true"
 def login_redirect(next_url: str = "/") -> RedirectResponse:
    target = "/auth/login"
    if next_url and next_url not in ("/", "/auth/login"):
        from urllib.parse import quote
        target = f"{target}?next={quote(next_url, safe='')}"
    return RedirectResponse(target, status_code=status.HTTP_303_SEE_OTHER)
@@ -0,0 +1,64 @@
 """Application configuration, loaded from the environment and/or a .env file."""
 from __future__ import annotations
 import secrets
 from functools import lru_cache
 from pathlib import Path
 from typing import Literal
 from pydantic import Field, field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 class Settings(BaseSettings):
    """Runtime configuration. Every variable is prefixed ``LEMBAS_``."""
    model_config = SettingsConfigDict(
        env_prefix="LEMBAS_",
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )
    secret_key: str = Field(default="")
    data_dir: Path = Path("./data")
    host: str = "127.0.0.1"
    port: int = 8080
    reload: bool = False
    log_level: Literal["debug", "info", "warning", "error"] = "info"
    allow_signup: bool = True
    default_theme: Literal["moria", "shire"] = "moria"
    session_ttl: int = 60 * 60 * 24 * 30
    request_timeout: float = 300.0
    @field_validator("secret_key")
    @classmethod
    def _generate_secret_if_absent(cls, v: str) -> str:
        # A generated key lets `lembas serve` work out of the box, but it changes
        # on every restart: sessions drop and stored API keys become unreadable.
        # main.py warns loudly about this. Never rely on it in production.
        return v or secrets.token_urlsafe(48)
    @property
    def db_path(self) -> Path:
        return self.data_dir / "lembas.db"
    @property
    def uploads_dir(self) -> Path:
        return self.data_dir / "uploads"
    def ensure_dirs(self) -> None:
        self.data_dir.mkdir(parents=True, exist_ok=True)
        self.uploads_dir.mkdir(parents=True, exist_ok=True)
@lru_cache
 def get_settings() -> Settings:
    """Cached singleton so config is parsed once per process."""
    return Settings()
 settings = get_settings()
@@ -0,0 +1,54 @@
 """Declarative base and column conventions shared by every model.
 There is no Alembic in this project (SQLite only, schema created at startup).
 That makes adding a column to an existing deployment a manual chore, so models
 carry a few forward-looking columns that are not read yet -- see the notes on
 ``Message.parent_id`` and ``Message.content_parts_json``.
 """
 from __future__ import annotations
 import uuid
 from datetime import UTC, datetime
 from sqlalchemy import DateTime, MetaData, String
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
 # Explicit naming convention so constraints have stable, predictable names.
 NAMING_CONVENTION = {
    "ix": "ix_%(column_0_label)s",
    "uq": "uq_%(table_name)s_%(column_0_name)s",
    "ck": "ck_%(table_name)s_%(constraint_name)s",
    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
    "pk": "pk_%(table_name)s",
 }
 def new_id() -> str:
    """Primary keys are UUID4 hex strings: URL-safe and non-enumerable."""
    return uuid.uuid4().hex
 def utcnow() -> datetime:
    return datetime.now(UTC)
 class Base(DeclarativeBase):
    metadata = MetaData(naming_convention=NAMING_CONVENTION)
 class UUIDPrimaryKey:
    """Mixin: opaque string primary key generated in Python."""
    id: Mapped[str] = mapped_column(String(32), primary_key=True, default=new_id)
 class Timestamps:
    """Mixin: creation and modification times, both timezone-aware UTC."""
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=utcnow, nullable=False
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=utcnow, onupdate=utcnow, nullable=False
    )
@@ -0,0 +1,45 @@
 """All ORM models.
 Importing this package registers every table on ``Base.metadata``, which is
 what ``init_db()`` relies on to create the schema at startup. Any new model
 module must be imported here or its table will silently never be created.
 """
 from lembas.db.models.chat import (
    ROLE_ASSISTANT,
    ROLE_SYSTEM,
    ROLE_TOOL,
    ROLE_USER,
    Chat,
    Folder,
    Message,
 )
 from lembas.db.models.connection import Connection, Model
 from lembas.db.models.setting import Setting
 from lembas.db.models.user import (
    ROLE_ADMIN,
    ROLE_PENDING,
    Group,
    Session,
    User,
    user_groups,
 )
 __all__ = [
    "ROLE_ADMIN",
    "ROLE_ASSISTANT",
    "ROLE_PENDING",
    "ROLE_SYSTEM",
    "ROLE_TOOL",
    "ROLE_USER",
    "Chat",
    "Connection",
    "Folder",
    "Group",
    "Message",
    "Model",
    "Session",
    "Setting",
    "User",
    "user_groups",
 ]
@@ -0,0 +1,117 @@
 """Folders, chats and messages."""
 from __future__ import annotations
 from typing import Any
 from sqlalchemy import Boolean, ForeignKey, Integer, String, Text
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from lembas.db.base import Base, Timestamps, UUIDPrimaryKey
 from lembas.db.types import JSONDict, JSONList
 ROLE_SYSTEM = "system"
 ROLE_USER = "user"
 ROLE_ASSISTANT = "assistant"
 ROLE_TOOL = "tool"
 class Folder(UUIDPrimaryKey, Timestamps, Base):
    """A user-owned, arbitrarily nested container for chats."""
    __tablename__ = "folders"
    user_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    parent_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("folders.id", ondelete="CASCADE")
    )
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    position: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    collapsed: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    children: Mapped[list[Folder]] = relationship(
        back_populates="parent",
        cascade="all, delete-orphan",
        order_by="Folder.position, Folder.name",
    )
    parent: Mapped[Folder | None] = relationship(back_populates="children", remote_side="Folder.id")
    chats: Mapped[list[Chat]] = relationship(back_populates="folder")
    def __repr__(self) -> str:
        return f"<Folder {self.name}>"
 class Chat(UUIDPrimaryKey, Timestamps, Base):
    __tablename__ = "chats"
    user_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    # Deleting a folder keeps its chats; they fall back to the unfiled list.
    folder_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("folders.id", ondelete="SET NULL"), index=True
    )
    title: Mapped[str] = mapped_column(String(300), default="New chat")
    # Set once the model writes the first reply, so auto-titling only runs once.
    title_generated: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    # Denormalised rather than a foreign key: chat history must survive an admin
    # deleting a connection or a model disappearing upstream.
    model_id: Mapped[str] = mapped_column(String(300), default="")
    connection_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("connections.id", ondelete="SET NULL")
    )
    system_prompt: Mapped[str] = mapped_column(Text, default="")
    params_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    pinned: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    archived: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    folder: Mapped[Folder | None] = relationship(back_populates="chats")
    messages: Mapped[list[Message]] = relationship(
        back_populates="chat",
        cascade="all, delete-orphan",
        order_by="Message.created_at",
    )
    def __repr__(self) -> str:
        return f"<Chat {self.title!r}>"
 class Message(UUIDPrimaryKey, Timestamps, Base):
    __tablename__ = "messages"
    chat_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("chats.id", ondelete="CASCADE"), nullable=False, index=True
    )
    # Reserved for conversation branching (edit a message, regenerate a reply
    # and keep both). Nothing reads it yet; it exists now because retrofitting a
    # column onto a live SQLite database without migrations is painful.
    parent_id: Mapped[str | None] = mapped_column(String(32), ForeignKey("messages.id"))
    role: Mapped[str] = mapped_column(String(16), nullable=False)
    content: Mapped[str] = mapped_column(Text, default="")
    # Reserved for multimodal turns: [{"type": "image_url", ...}, ...].
    # Plain-text messages leave this empty and use `content`.
    content_parts_json: Mapped[list[Any]] = mapped_column(JSONList, default=list)
    model_id: Mapped[str] = mapped_column(String(300), default="")
    tool_calls_json: Mapped[list[Any]] = mapped_column(JSONList, default=list)
    usage_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    # Non-empty when generation failed. Rendered as a styled error in the
    # thread so a failed turn is never an unexplained blank bubble.
    error: Mapped[str] = mapped_column(Text, default="")
    # False while a reply is still streaming; flipped when the stream ends.
    complete: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    chat: Mapped[Chat] = relationship(back_populates="messages")
    def __repr__(self) -> str:
        return f"<Message {self.role} {self.content[:40]!r}>"
@@ -0,0 +1,82 @@
 """OpenAI-compatible endpoint connections and their discovered models."""
 from __future__ import annotations
 from datetime import datetime
 from typing import Any
 from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from lembas.db.base import Base, Timestamps, UUIDPrimaryKey
 from lembas.db.types import JSONDict
 class Connection(UUIDPrimaryKey, Timestamps, Base):
    """A configured upstream endpoint speaking the OpenAI HTTP API.
    Works for api.openai.com as well as LM Studio, vLLM, llama.cpp, Ollama's
    compatibility layer, OpenRouter, and anything else exposing /v1.
    """
    __tablename__ = "connections"
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    base_url: Mapped[str] = mapped_column(String(500), nullable=False)
    # Fernet ciphertext, never the raw key. See lembas.services.crypto.
    # Empty string is legitimate: local endpoints often need no auth at all.
    api_key_encrypted: Mapped[str] = mapped_column(Text, default="")
    enabled: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    position: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    # Extra headers merged into every request (e.g. OpenRouter's HTTP-Referer).
    extra_headers_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    # Result of the most recent "Test & refresh", surfaced in the admin list.
    last_checked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    last_error: Mapped[str] = mapped_column(Text, default="")
    models: Mapped[list[Model]] = relationship(
        back_populates="connection",
        cascade="all, delete-orphan",
        order_by="Model.model_id",
    )
    def __repr__(self) -> str:
        return f"<Connection {self.name} {self.base_url}>"
 class Model(UUIDPrimaryKey, Timestamps, Base):
    """A model advertised by a connection, cached locally.
    Cached rather than fetched live so the chat UI stays responsive and keeps
    working when an endpoint is briefly unreachable. Refreshed on demand from
    the admin screen.
    """
    __tablename__ = "models"
    __table_args__ = (UniqueConstraint("connection_id", "model_id"),)
    connection_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("connections.id", ondelete="CASCADE"), nullable=False, index=True
    )
    model_id: Mapped[str] = mapped_column(String(300), nullable=False)
    display_name: Mapped[str] = mapped_column(String(300), default="")
    enabled: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    # Endpoints do not reliably advertise capabilities, so these are admin
    # overrides consumed by later passes (vision uploads, tool calling).
    capabilities_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    # Default sampling params applied to new chats using this model.
    params_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    connection: Mapped[Connection] = relationship(back_populates="models")
    @property
    def label(self) -> str:
        return self.display_name or self.model_id
    def __repr__(self) -> str:
        return f"<Model {self.model_id}>"
@@ -0,0 +1,28 @@
 """Instance-wide settings, stored as a key/value table."""
 from __future__ import annotations
 from typing import Any
 from sqlalchemy import String
 from sqlalchemy.orm import Mapped, mapped_column
 from lembas.db.base import Base, Timestamps
 from lembas.db.types import JSONDict
 class Setting(Timestamps, Base):
    """One row per settings group, value is an arbitrary JSON object.
    A key/value table rather than a wide typed table: admin settings grow with
    every feature (tools, agents, image generation) and adding a column to a
    live SQLite database without migrations is exactly what this avoids.
    """
    __tablename__ = "settings"
    key: Mapped[str] = mapped_column(String(120), primary_key=True)
    value: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    def __repr__(self) -> str:
        return f"<Setting {self.key}>"
@@ -0,0 +1,89 @@
 """Users, groups and login sessions."""
 from __future__ import annotations
 from datetime import datetime
 from typing import Any
 from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Index, String, Table, Text
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from lembas.db.base import Base, Timestamps, UUIDPrimaryKey
 from lembas.db.types import JSONDict
 # Roles are a simple ordered ladder rather than a permission matrix. Groups
 # (below) carry finer-grained permissions once the users/groups UI lands.
 ROLE_ADMIN = "admin"
 ROLE_USER = "user"
 ROLE_PENDING = "pending"  # registered but awaiting admin approval
 user_groups = Table(
    "user_groups",
    Base.metadata,
    Column("user_id", String(32), ForeignKey("users.id", ondelete="CASCADE"), primary_key=True),
    Column("group_id", String(32), ForeignKey("groups.id", ondelete="CASCADE"), primary_key=True),
 )
 class User(UUIDPrimaryKey, Timestamps, Base):
    __tablename__ = "users"
    email: Mapped[str] = mapped_column(String(320), unique=True, nullable=False, index=True)
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    password_hash: Mapped[str] = mapped_column(Text, nullable=False)
    role: Mapped[str] = mapped_column(String(16), default=ROLE_USER, nullable=False)
    active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    last_login_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    # Per-user preferences: theme, default model, composer behaviour, etc.
    settings_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    groups: Mapped[list[Group]] = relationship(secondary=user_groups, back_populates="users")
    sessions: Mapped[list[Session]] = relationship(
        back_populates="user", cascade="all, delete-orphan"
    )
    @property
    def is_admin(self) -> bool:
        return self.role == ROLE_ADMIN
    def __repr__(self) -> str:
        return f"<User {self.email} role={self.role}>"
 class Group(UUIDPrimaryKey, Timestamps, Base):
    """A named set of users. Permissions are enforced once the RBAC pass lands."""
    __tablename__ = "groups"
    name: Mapped[str] = mapped_column(String(120), unique=True, nullable=False)
    description: Mapped[str] = mapped_column(Text, default="")
    permissions_json: Mapped[dict[str, Any]] = mapped_column(JSONDict, default=dict)
    users: Mapped[list[User]] = relationship(secondary=user_groups, back_populates="groups")
 class Session(UUIDPrimaryKey, Timestamps, Base):
    """Server-side login session.
    Sessions live in the database rather than in a signed JWT so that logging
    out, banning a user, or rotating a device actually revokes access
    immediately instead of waiting for a token to expire.
    """
    __tablename__ = "sessions"
    user_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    # SHA-256 of the cookie value. The raw token is shown to the browser once
    # and never stored, so a database leak does not hand over live sessions.
    token_hash: Mapped[str] = mapped_column(String(64), unique=True, nullable=False)
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    user_agent: Mapped[str] = mapped_column(Text, default="")
    ip_address: Mapped[str] = mapped_column(String(45), default="")
    user: Mapped[User] = relationship(back_populates="sessions")
 Index("ix_sessions_user_id", Session.user_id)
@@ -0,0 +1,102 @@
 """Engine, session factory and startup schema creation."""
 from __future__ import annotations
 import logging
 from collections.abc import Iterator
 from contextlib import contextmanager
 from sqlalchemy import Engine, create_engine, event
 from sqlalchemy.orm import Session, sessionmaker
 from lembas.config import settings
 from lembas.db.base import Base
 log = logging.getLogger(__name__)
 _engine: Engine | None = None
 _SessionFactory: sessionmaker[Session] | None = None
@event.listens_for(Engine, "connect")
 def _configure_sqlite(dbapi_connection, connection_record) -> None:  # noqa: ANN001
    """Apply the pragmas SQLite needs to behave under a concurrent web server.
    - WAL lets readers proceed while a write is in flight, which matters because
      a streaming reply holds a write open for the length of the generation.
    - foreign_keys is OFF by default in SQLite, so every ondelete= in the models
      would be decoration without this.
    - busy_timeout makes concurrent writers wait rather than fail instantly.
    """
    cursor = dbapi_connection.cursor()
    cursor.execute("PRAGMA journal_mode=WAL")
    cursor.execute("PRAGMA foreign_keys=ON")
    cursor.execute("PRAGMA busy_timeout=5000")
    cursor.execute("PRAGMA synchronous=NORMAL")
    cursor.close()
 def get_engine() -> Engine:
    global _engine
    if _engine is None:
        settings.ensure_dirs()
        _engine = create_engine(
            f"sqlite:///{settings.db_path}",
            # FastAPI runs sync endpoints in a threadpool, so a connection can
            # legitimately be used from a thread other than the one that made it.
            connect_args={"check_same_thread": False},
            echo=False,
            future=True,
        )
    return _engine
 def get_session_factory() -> sessionmaker[Session]:
    global _SessionFactory
    if _SessionFactory is None:
        _SessionFactory = sessionmaker(
            bind=get_engine(),
            autoflush=False,
            expire_on_commit=False,
        )
    return _SessionFactory
 def init_db() -> None:
    """Create any missing tables.
    This is ``CREATE TABLE IF NOT EXISTS`` only -- it never alters an existing
    table. There is no migration tool in this project by design, so changing a
    column on a model requires migrating the database by hand.
    """
    import lembas.db.models  # noqa: F401  (registers tables on the metadata)
    Base.metadata.create_all(bind=get_engine())
    log.debug("schema ensured at %s", settings.db_path)
@contextmanager
 def session_scope() -> Iterator[Session]:
    """Transactional scope for background work and CLI commands.
    Request handlers should use the `db` dependency in lembas.api.deps instead.
    """
    factory = get_session_factory()
    session = factory()
    try:
        yield session
        session.commit()
    except Exception:
        session.rollback()
        raise
    finally:
        session.close()
 def reset_engine() -> None:
    """Drop cached engine/factory. Used by tests to rebind to a temp database."""
    global _engine, _SessionFactory
    if _engine is not None:
        _engine.dispose()
    _engine = None
    _SessionFactory = None
@@ -0,0 +1,14 @@
 """Reusable column types.
 SQLite stores JSON as text. Wrapping the JSON type in SQLAlchemy's mutation
 tracking means ``obj.settings_json["theme"] = "shire"`` marks the row dirty --
 without it, in-place edits of a dict column are silently dropped on flush.
 """
 from __future__ import annotations
 from sqlalchemy import JSON
 from sqlalchemy.ext.mutable import MutableDict, MutableList
 JSONDict = MutableDict.as_mutable(JSON)
 JSONList = MutableList.as_mutable(JSON)
@@ -0,0 +1,40 @@
 """Password hashing.
 Argon2id via argon2-cffi, using the library's current recommended parameters.
 ``needs_rehash`` lets stored hashes be upgraded transparently when those
 defaults tighten in a future release.
 """
 from __future__ import annotations
 from argon2 import PasswordHasher
 from argon2.exceptions import InvalidHashError, VerifyMismatchError, VerificationError
 _hasher = PasswordHasher()
 MIN_PASSWORD_LENGTH = 8
 def hash_password(password: str) -> str:
    return _hasher.hash(password)
 def verify_password(password: str, password_hash: str) -> bool:
    try:
        return _hasher.verify(password_hash, password)
    except (VerifyMismatchError, VerificationError, InvalidHashError):
        return False
 def needs_rehash(password_hash: str) -> bool:
    try:
        return _hasher.check_needs_rehash(password_hash)
    except InvalidHashError:
        return True
 def validate_password(password: str) -> str | None:
    """Return a human-readable problem with the password, or None if it is fine."""
    if len(password) < MIN_PASSWORD_LENGTH:
        return f"Password must be at least {MIN_PASSWORD_LENGTH} characters."
    return None
@@ -0,0 +1,99 @@
 """Login session lifecycle.
 The browser holds an opaque random token in an httpOnly cookie. The database
 stores only its SHA-256, so a dump of the sessions table cannot be replayed as
 a live login. Tokens are compared by hash lookup, and revoking is a DELETE.
 """
 from __future__ import annotations
 import hashlib
 import secrets
 from datetime import UTC, datetime, timedelta
 from sqlalchemy import select
 from sqlalchemy.orm import Session as DBSession
 from lembas.config import settings
 from lembas.db.models import Session as SessionRow
 from lembas.db.models import User
 COOKIE_NAME = "lembas_session"
 TOKEN_BYTES = 32
 def _hash_token(token: str) -> str:
    return hashlib.sha256(token.encode("utf-8")).hexdigest()
 def create_session(
    db: DBSession,
    user: User,
    *,
    user_agent: str = "",
    ip_address: str = "",
 ) -> str:
    """Open a session for a user and return the raw token for the cookie.
    The raw token is returned exactly once and never persisted.
    """
    token = secrets.token_urlsafe(TOKEN_BYTES)
    row = SessionRow(
        user_id=user.id,
        token_hash=_hash_token(token),
        expires_at=datetime.now(UTC) + timedelta(seconds=settings.session_ttl),
        user_agent=user_agent[:500],
        ip_address=ip_address[:45],
    )
    db.add(row)
    user.last_login_at = datetime.now(UTC)
    db.commit()
    return token
 def resolve_session(db: DBSession, token: str | None) -> User | None:
    """Return the signed-in user for a cookie value, or None.
    Expired and orphaned sessions are cleaned up as they are encountered, which
    keeps the table tidy without needing a scheduled job.
    """
    if not token:
        return None
    row = db.scalar(select(SessionRow).where(SessionRow.token_hash == _hash_token(token)))
    if row is None:
        return None
    # SQLite hands back naive datetimes even for timezone-aware columns.
    expires_at = row.expires_at
    if expires_at.tzinfo is None:
        expires_at = expires_at.replace(tzinfo=UTC)
    if expires_at < datetime.now(UTC):
        db.delete(row)
        db.commit()
        return None
    user = db.get(User, row.user_id)
    if user is None or not user.active:
        db.delete(row)
        db.commit()
        return None
    return user
 def revoke_session(db: DBSession, token: str | None) -> None:
    if not token:
        return
    row = db.scalar(select(SessionRow).where(SessionRow.token_hash == _hash_token(token)))
    if row is not None:
        db.delete(row)
        db.commit()
 def revoke_all_for_user(db: DBSession, user: User) -> None:
    """Sign a user out everywhere. Used when deactivating or changing a password."""
    for row in db.scalars(select(SessionRow).where(SessionRow.user_id == user.id)):
        db.delete(row)
    db.commit()
@@ -0,0 +1,58 @@
 """Symmetric encryption for secrets stored in the database.
 Only upstream API keys use this today. The key is derived from
 ``LEMBAS_SECRET_KEY`` rather than stored separately, which means rotating that
 variable makes every stored API key unreadable -- decrypt() returns "" rather
 than raising, so the app degrades to "re-enter your keys" instead of crashing.
 """
 from __future__ import annotations
 import base64
 import hashlib
 import logging
 from functools import lru_cache
 from cryptography.fernet import Fernet, InvalidToken
 from lembas.config import settings
 log = logging.getLogger(__name__)
@lru_cache
 def _fernet() -> Fernet:
    # Fernet requires a 32-byte urlsafe-base64 key; SECRET_KEY is free-form text.
    digest = hashlib.sha256(settings.secret_key.encode("utf-8")).digest()
    return Fernet(base64.urlsafe_b64encode(digest))
 def encrypt(plaintext: str) -> str:
    """Encrypt a secret. Empty input stays empty -- keyless endpoints are valid."""
    if not plaintext:
        return ""
    return _fernet().encrypt(plaintext.encode("utf-8")).decode("ascii")
 def decrypt(ciphertext: str) -> str:
    """Decrypt a secret, returning "" if it cannot be read.
    An unreadable value almost always means LEMBAS_SECRET_KEY changed. Failing
    soft keeps the admin UI usable so the key can simply be re-entered.
    """
    if not ciphertext:
        return ""
    try:
        return _fernet().decrypt(ciphertext.encode("ascii")).decode("utf-8")
    except (InvalidToken, ValueError):
        log.warning("could not decrypt a stored secret; has LEMBAS_SECRET_KEY changed?")
        return ""
 def mask(secret: str) -> str:
    """Render a secret for display: never the whole thing, just enough to identify it."""
    if not secret:
        return ""
    if len(secret) <= 8:
        return "*" * len(secret)
    return f"{secret[:3]}{'*' * 8}{secret[-4:]}"
@@ -0,0 +1,125 @@
 {#
  Icon sprite, inlined once at the top of <body>.
  It lives here rather than in assets/ and is deliberately NOT loaded as an
  external file: cross-document <use href="sprite.svg#id"> has patchy browser
  support, while same-document <use href="#id"> is universal. Inlining also
  costs zero extra requests.
  Icons are 24x24, stroked (never filled), and inherit currentColor, so they
  take the surrounding text colour in every theme automatically.
  Use via the macro in _macros.html:  {{ icon("send") }}
 #}
 <svg xmlns="http://www.w3.org/2000/svg" style="display:none" aria-hidden="true">
  <defs>
    <g id="icon-defaults"></g>
  </defs>
  <symbol id="i-send" viewBox="0 0 24 24"><path d="M12 20V5M5 12l7-7 7 7"/></symbol>
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    <circle cx="12" cy="5" r="1.4"/><circle cx="12" cy="12" r="1.4"/><circle cx="12" cy="19" r="1.4"/>
  </symbol>
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    <path d="M20.5 12.2a7.7 7.7 0 0 1-8.3 7.7l-5 2.4.9-3.7a7.7 7.7 0 1 1 12.4-6.4Z"/>
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    <circle cx="12" cy="8.3" r="3.8"/>
    <path d="M4.5 20a7.5 7.5 0 0 1 15 0"/>
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    <path d="M14.5 4.5H18a2 2 0 0 1 2 2v11a2 2 0 0 1-2 2h-3.5"/>
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    <path d="M7 7h.01M7 17h.01"/>
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  <symbol id="i-sliders" viewBox="0 0 24 24">
    <path d="M4 8h10M18 8h2M4 16h4M12 16h8"/>
    <circle cx="16" cy="8" r="2"/><circle cx="10" cy="16" r="2"/>
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    <circle cx="12" cy="12" r="3.2"/>
    <path d="M12 3v2.2M12 18.8V21M3 12h2.2M18.8 12H21M5.6 5.6l1.6 1.6M16.8 16.8l1.6 1.6M18.4 5.6l-1.6 1.6M7.2 16.8l-1.6 1.6"/>
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  </symbol>
 </svg>
		`@@ -0,0 +1,3 @@`
							`"""LLeMbas - a Middle-earth themed web UI for OpenAI-compatible LLM endpoints."""`

							`__version__ = "0.1.0"`