fix: embed actual ALPHA-LOGO.png as RGB JPEG in PDF (cached on disk)

app/services/certificate_service.py

@@ -1,5 +1,6 @@
 """Certificate service: issuance, verification, PDF rendering."""
 
+import base64
 import io
 import os
 import random
@@ -110,6 +111,35 @@ def _ar(text: str) -> str:
         return text
 
 
+# --------------------------------------------------------------------------- #
+#  Logo preparation (convert ALPHA-LOGO.png RGBA → RGB JPEG, cache on disk)  #
+# --------------------------------------------------------------------------- #
+
+_LOGO_JPG_PATH: Optional[str] = None
+
+def _prepare_logo():
+    global _LOGO_JPG_PATH
+    if _LOGO_JPG_PATH is not None:
+        return
+    try:
+        from PIL import Image as _PIL
+        from app.services.logo_data import LOGO_B64
+        raw = base64.b64decode(LOGO_B64)
+        pil = _PIL.open(io.BytesIO(raw))
+        if pil.mode != "RGB":
+            bg = _PIL.new("RGB", pil.size, (15, 27, 45))
+            if pil.mode == "RGBA":
+                bg.paste(pil, mask=pil.split()[3])
+            else:
+                bg.paste(pil)
+            pil = bg
+        path = os.path.join(tempfile.gettempdir(), "ca_alpha_logo.jpg")
+        pil.save(path, format="JPEG", quality=95)
+        _LOGO_JPG_PATH = path
+    except Exception:
+        _LOGO_JPG_PATH = ""
+
+
 # --------------------------------------------------------------------------- #
 #  Verifiability                                                              #
 # --------------------------------------------------------------------------- #
@@ -254,34 +284,12 @@ def build_certificate_pdf(
     c.setFillColor(GOLD)
     c.rect(BAR - 1.5 * mm, 0, 1.5 * mm, H, fill=1, stroke=0)
 
-    # ── Logo (drawn with reportlab primitives — always works) ──
-    cx_logo = BAR / 2
-    cy_logo = H - 36 * mm
-    r_logo = 10 * mm
-
-    # outer circle (gold border)
-    c.setStrokeColor(GOLD)
-    c.setLineWidth(1.0)
-    c.circle(cx_logo, cy_logo, r_logo, fill=0, stroke=1)
-
-    # inner circle (navy fill)
-    c.setFillColor(NAVY)
-    c.circle(cx_logo, cy_logo, r_logo - 0.8 * mm, fill=1, stroke=0)
-
-    # "A" letter (gold)
-    c.setFillColor(GOLD)
-    c.setFont(_font("bold"), 20)
-    c.drawCentredString(cx_logo, cy_logo - 7 * mm, "A")
-
-    # small shield accent below the A
-    sp = c.beginPath()
-    sp.moveTo(cx_logo, cy_logo - 9 * mm)
-    sp.lineTo(cx_logo + 3 * mm, cy_logo - 6 * mm)
-    sp.lineTo(cx_logo, cy_logo - 3 * mm)
-    sp.lineTo(cx_logo - 3 * mm, cy_logo - 6 * mm)
-    sp.close()
-    c.setFillColor(GOLD)
-    c.drawPath(sp, fill=1, stroke=0)
+    # ── Logo: ALPHA-LOGO.png (RGB JPEG, cached on disk) ──
+    _prepare_logo()
+    if _LOGO_JPG_PATH and os.path.exists(_LOGO_JPG_PATH):
+        logo_size = 22 * mm
+        c.drawImage(_LOGO_JPG_PATH, (BAR - logo_size) / 2, H - 36 * mm,
+                    width=logo_size, height=logo_size, preserveAspectRatio=True)
 
     c.setFillColor(GOLD)
     c.setFont(_font("bold"), 10)