Molodetz blogrol volgens DPP-template

2026-10-05 09:36:20 +02:00
commit f290a4c766
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+# retoor <retoor@molodetz.nl>
+import hashlib
+from functools import lru_cache
+from html import escape
+
+PALETTE = (
+    ("#1b1a17", "#e2a100"),
+    ("#141414", "#c9c2b2"),
+    ("#1d1b16", "#b98a2e"),
+    ("#121417", "#8fa3a8"),
+    ("#191512", "#d9b779"),
+)
+
+
+@lru_cache(maxsize=4096)
+def render_avatar_svg(seed, size=64):
+    size = max(16, min(int(size), 512))
+    try:
+        digest = hashlib.sha256(seed.encode("utf-8")).digest()
+        background, ink = PALETTE[digest[0] % len(PALETTE)]
+        cells = []
+        unit = size / 5
+        for row in range(5):
+            for col in range(3):
+                if digest[1 + row * 3 + col] % 2 == 0:
+                    for mirrored in {col, 4 - col}:
+                        cells.append(
+                            f'<rect x="{mirrored * unit:.2f}" y="{row * unit:.2f}" width="{unit:.2f}" height="{unit:.2f}" fill="{ink}"/>'
+                        )
+        body = "".join(cells)
+    except Exception:
+        background, ink = PALETTE[0]
+        letter = escape((seed or "?")[:1].upper())
+        body = f'<text x="50%" y="58%" text-anchor="middle" font-family="Georgia, serif" font-size="{size // 2}" fill="{ink}">{letter}</text>'
+    return (
+        f'<svg xmlns="http://www.w3.org/2000/svg" width="{size}" height="{size}" viewBox="0 0 {size} {size}">'
+        f'<rect width="{size}" height="{size}" fill="{background}"/>{body}</svg>'
+    )
+
+
+def avatar_url(seed, size=64):
+    return f"/avatar/svg/{seed}?size={size}"