新增多证书模板管理流程

backend/app/services/pdf.py

@@ -8,6 +8,11 @@ from PIL import Image, ImageDraw, ImageFont
 from app.core.config import settings
 from app.core.paths import data_path
 from app.models import Certificate, CertificateAccessToken, Learner, ProjectCourse
+from app.services.certificate_templates import (
+    CLASSIC_TEMPLATE_CODE,
+    PRACTICE_CAMP_TEMPLATE_CODE,
+    get_certificate_template,
+)
 
 DESIGN_WIDTH = 1024
 DESIGN_HEIGHT = 759
@@ -70,13 +75,8 @@ def mark_pdf_generated(certificate: Certificate, output_path: Path) -> None:
     update_pdf_access_time(certificate)
 
 
-def certificate_template_path() -> Path:
-    assets_dir = Path(__file__).resolve().parents[1] / "assets"
-    for name in ["certificate-template.png", "certificate-template.jpg"]:
-        path = assets_dir / name
-        if path.exists():
-            return path
-    raise FileNotFoundError("Certificate template image not found")
+def certificate_template_path(template_code: str = CLASSIC_TEMPLATE_CODE) -> Path:
+    return get_certificate_template(template_code).asset_path
 
 
 def pdf_resolution(image: Image.Image) -> float:
@@ -91,7 +91,8 @@ def render_certificate_pdf(
     concurrency_limit: int = 2,
 ) -> Path:
     output_path = pdf_cache_path(certificate.certificate_no)
-    template_path = certificate_template_path()
+    template_code = getattr(certificate, "template_code", CLASSIC_TEMPLATE_CODE)
+    template_path = certificate_template_path(template_code)
     latest_renderer_mtime = max(template_path.stat().st_mtime, Path(__file__).stat().st_mtime)
     if cached_pdf_is_fresh(output_path) and output_path.stat().st_mtime >= latest_renderer_mtime:
         mark_pdf_generated(certificate, output_path)
@@ -112,7 +113,13 @@ def render_certificate_pdf(
 
 
 def render_certificate_image(certificate: Certificate, learner: Learner, project: ProjectCourse | None) -> Image.Image:
-    template = certificate_template_path()
+    if getattr(certificate, "template_code", CLASSIC_TEMPLATE_CODE) == PRACTICE_CAMP_TEMPLATE_CODE:
+        return render_practice_camp_certificate_image(certificate, learner)
+    return render_classic_certificate_image(certificate, learner, project)
+
+
+def render_classic_certificate_image(certificate: Certificate, learner: Learner, project: ProjectCourse | None) -> Image.Image:
+    template = certificate_template_path(CLASSIC_TEMPLATE_CODE)
     image = Image.open(template).convert("RGB")
     base_image = image.copy()
     draw = ImageDraw.Draw(image)
@@ -174,6 +181,62 @@ def render_certificate_image(certificate: Certificate, learner: Learner, project
     return image
 
 
+def render_practice_camp_certificate_image(certificate: Certificate, learner: Learner) -> Image.Image:
+    design_width = 1854
+    design_height = 1359
+    image = Image.open(certificate_template_path(PRACTICE_CAMP_TEMPLATE_CODE)).convert("RGB")
+    draw = ImageDraw.Draw(image)
+    x_scale = image.width / design_width
+    y_scale = image.height / design_height
+    text_scale = (x_scale + y_scale) / 2
+
+    start_year, start_month, _ = date_parts(certificate.course_start_date or certificate.issue_date)
+    end_year, end_month, _ = date_parts(certificate.course_end_date or certificate.issue_date)
+    issue_year, issue_month, issue_day = date_parts(certificate.issue_date)
+
+    draw.text(
+        (568 * x_scale, 542 * y_scale),
+        learner.current_name,
+        fill="#202020",
+        font=font(42, "kai", True, text_scale),
+        anchor="ms",
+    )
+    for value, x in [
+        (start_year, 474),
+        (start_month, 630),
+        (end_year, 888),
+        (end_month, 1058),
+    ]:
+        draw.text(
+            (x * x_scale, 668 * y_scale),
+            value,
+            fill="#202020",
+            font=font(41, "song", False, text_scale),
+            anchor="ms",
+        )
+
+    issue_date_text = f"{issue_year}年{issue_month}月{issue_day}日"
+    issue_date_font = font(36, "song", False, text_scale)
+    issue_date_position = (568 * x_scale, 1158 * y_scale)
+    draw.rectangle(
+        (
+            442 * x_scale,
+            1118 * y_scale,
+            696 * x_scale,
+            1168 * y_scale,
+        ),
+        fill="#ffffff",
+    )
+    draw.text(
+        issue_date_position,
+        issue_date_text,
+        fill="#202020",
+        font=issue_date_font,
+        anchor="ms",
+    )
+    return image
+
+
 def font(size: int, kind: str = "song", bold: bool = False, scale: float = 1.0) -> ImageFont.FreeTypeFont | ImageFont.ImageFont:
     choices = {
         "kai": [