feat(certificates): шрифты Mont, PT Serif и Lobster для элементов шаблона

assets/certificates/fonts/Lobster-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2010 The Lobster Project Authors (https://github.com/impallari/The-Lobster-Font), with Reserved Font Name "Lobster".
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

assets/certificates/fonts/PTSerif-OFL.txt

@@ -0,0 +1,93 @@
+Copyright (c) 2010, ParaType Ltd. (http://www.paratype.com/public),
+with Reserved Font Names "PT Sans", "PT Serif" and "ParaType".
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1 
+This license is copied below, and is also available with a FAQ at: 
+http://scripts.sil.org/OFL
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

assets/certificates/fonts/README.md

@@ -0,0 +1,21 @@
+# Certificate fonts
+
+The renderer bundles these Google Fonts files at commit
+[`e7db6ca603fd4862010383ff17ffd6cc4ffac1c0`](https://github.com/google/fonts/tree/e7db6ca603fd4862010383ff17ffd6cc4ffac1c0):
+
+| Local file | Upstream file | SHA-256 |
+| --- | --- | --- |
+| PTSerif-Regular.ttf | ofl/ptserif/PT_Serif-Web-Regular.ttf | a4951fade06ff8f09b7673aa81ffb65a8cd409e24d3289a6dc670bc4dda2557a |
+| PTSerif-Bold.ttf | ofl/ptserif/PT_Serif-Web-Bold.ttf | 038ba7336bd7ea14f12ad155bed51a4345cac5153275d521dec3ba04021c526e |
+| Lobster-Regular.ttf | ofl/lobster/Lobster-Regular.ttf | d6568e697fd50cedc0be04d8aae4127fe95add607e7bff954ca88604be80c205 |
+
+PT Serif: ParaType. See [license and attribution](PTSerif-OFL.txt).
+Lobster: The Lobster Project Authors. See [license and attribution](Lobster-OFL.txt).
+The upstream font names and outlines are unchanged. Mont continues to use the
+existing application assets in `assets/users/user_CV/`.
+
+Frontend WOFF2 files are lossless container conversions of these TTF sources.
+The backend uses the exact TTF files for both Pillow measurements and embedded PDF
+faces. The renderer never downloads fonts during PDF generation. Lobster has one
+400-weight face; it is used without synthetic bold. PT Serif uses 400/700 and Mont
+uses the existing 400/600 faces.

docs/modules/program-certificates.md

@@ -86,3 +86,15 @@ PDF не изменяются, миграция БД не требуется. П
 включая подгонку текста. Фон вписывается целиком без обрезки; вертикальные
 изображения сохраняют разрешение до 2480 × 3508. Ранее сформированные PDF
 не пересоздаются. Миграция базы не требуется.
+
+## Шрифты элементов
+
+`layout.<element>.font_family`: `mont`, `pt-serif` или `lobster`. Выбор хранится
+отдельно для каждого элемента и входит в снимок выдачи. Старые шаблоны без поля
+используют Mont. Старый клиент, опустивший поле, сохраняет предыдущий выбор
+конкретного элемента; неизвестные семейства и произвольные URL отклоняются.
+Pillow и PDF используют одни и те же локальные TTF, выбранный шрифт встраивается
+в PDF. PT Serif использует 400/700, Mont 400/600, Lobster единственный 400 без
+синтетического полужирного начертания. Шрифт изображения подписи не применяется.
+Миграция и обновление ранее выданных PDF не требуются. Источники и лицензии:
+`assets/certificates/fonts/README.md`.

partner_programs/services/certificates.py

@@ -27,6 +27,11 @@
 from projects.models import Collaborator
 
 logger = logging.getLogger(__name__)
+CERTIFICATE_FONTS = {
+    "mont": ("Mont", "Mont-Regular.ttf", "Mont-SemiBold.ttf", 600),
+    "pt-serif": ("Certificate PT Serif", "PTSerif-Regular.ttf", "PTSerif-Bold.ttf", 700),
+    "lobster": ("Certificate Lobster", "Lobster-Regular.ttf", "Lobster-Regular.ttf", 400),
+}
 ELEMENTS = (
     "title",
     "subtitle",
@@ -67,7 +72,9 @@ def default_draft():
         "subject": "Ваш сертификат за участие в программе {program}",
         "message": "Здравствуйте, {name}!\nСпасибо за участие в программе «{program}».\nВаш сертификат готов.",
         "layout": {
-            key: dict(zip(("x", "y", "width", "height", "font_size"), pos))
+            key: dict(
+                zip(("x", "y", "width", "height", "font_size"), pos), font_family="mont"
+            )
             for key, pos in zip(ELEMENTS, positions)
         },
     }
@@ -87,6 +94,10 @@ def normalized_draft(draft):
         **draft,
         "orientation": draft.get("orientation", "landscape"),
         "hidden_elements": [key for key in ELEMENTS if key in hidden_elements(draft)],
+        "layout": {
+            key: {**box, "font_family": box.get("font_family", "mont")}
+            for key, box in draft["layout"].items()
+        },
     }
 
 
@@ -232,6 +243,9 @@ class Element(serializers.Serializer):
         width = serializers.FloatField(min_value=2, max_value=100)
         height = serializers.FloatField(min_value=1, max_value=100)
         font_size = serializers.FloatField(min_value=8, max_value=72)
+        font_family = serializers.ChoiceField(
+            choices=list(CERTIFICATE_FONTS), required=False
+        )
 
     class Draft(serializers.Serializer):
         orientation = serializers.ChoiceField(
@@ -275,11 +289,18 @@ class Draft(serializers.Serializer):
         raise ValidationError({"hidden_elements": "Элементы не должны повторяться."})
     if set(data["layout"]) != set(ELEMENTS):
         raise ValidationError("Состав элементов шаблона изменен. Обновите страницу.")
-    for element in data["layout"].values():
+    for key, element in data["layout"].items():
         import math
 
-        if not all(math.isfinite(value) for value in element.values()):
+        if not all(
+            math.isfinite(element[field])
+            for field in ("x", "y", "width", "height", "font_size")
+        ):
             raise ValidationError("Размеры и положение должны быть конечными числами.")
+        element.setdefault(
+            "font_family",
+            (previous or {}).get("layout", {}).get(key, {}).get("font_family", "mont"),
+        )
         if (
             element["x"] + element["width"] > 100.01
             or element["y"] + element["height"] > 100.01
@@ -301,21 +322,29 @@ class Draft(serializers.Serializer):
     return normalized_draft(dict(data))
 
 
-@lru_cache(maxsize=4)
-def certificate_font(bold):
-    filename = "Mont-SemiBold.ttf" if bold else "Mont-Regular.ttf"
-    return ImageFont.truetype(
-        str(Path(settings.BASE_DIR) / "assets/users/user_CV" / filename), 1000
-    )
+def certificate_font_key(box):
+    key = box.get("font_family", "mont")
+    return key if key in CERTIFICATE_FONTS else "mont"
+
+
+def certificate_font_path(key, bold):
+    filename = CERTIFICATE_FONTS[key][2 if bold else 1]
+    directory = "assets/users/user_CV" if key == "mont" else "assets/certificates/fonts"
+    return Path(settings.BASE_DIR) / directory / filename
+
+
+@lru_cache(maxsize=6)
+def certificate_font(bold, family="mont"):
+    return ImageFont.truetype(str(certificate_font_path(family, bold)), 1000)
 
 
 def page_dimensions(orientation="landscape"):
     return (210, 297) if orientation == "portrait" else (297, 210)
 
 
 def fit_certificate_text(value, box, bold=False, orientation="landscape"):
-    """Подгоняем реальные строки Mont по обеим сторонам бокса, без обрезки ФИО."""
-    font = certificate_font(bold)
+    """Подгоняем реальные строки выбранного шрифта без обрезки ФИО."""
+    font = certificate_font(bold, certificate_font_key(box))
     page_width, page_height = (
         (793.7, 1122) if orientation == "portrait" else (1122, 793.7)
     )
@@ -361,21 +390,17 @@ def render_pdf(snapshot, assets, name, program_name, number, issued_at):
     from weasyprint import HTML
     from weasyprint.text.fonts import FontConfiguration
 
-    fonts = Path(settings.BASE_DIR) / "assets/users/user_CV"
     orientation = snapshot.get("orientation", "landscape")
     page_width, page_height = page_dimensions(orientation)
 
     def fetch(url):
-        if url == "certificate-font:regular":
-            return {
-                "string": (fonts / "Mont-Regular.ttf").read_bytes(),
-                "mime_type": "font/ttf",
-            }
-        if url == "certificate-font:bold":
-            return {
-                "string": (fonts / "Mont-SemiBold.ttf").read_bytes(),
-                "mime_type": "font/ttf",
-            }
+        for key in CERTIFICATE_FONTS:
+            for bold, weight in ((False, "regular"), (True, "bold")):
+                if url == f"certificate-font:{key}:{weight}":
+                    return {
+                        "string": certificate_font_path(key, bold).read_bytes(),
+                        "mime_type": "font/ttf",
+                    }
         if url.startswith("data:image/png;base64,"):
             return {
                 "string": base64.b64decode(url.split(",", 1)[1], validate=True),
@@ -411,23 +436,35 @@ def src(asset):
                 )
         else:
             value = values[key]
+            family = certificate_font_key(box)
+            family_name, _, _, bold_weight = CERTIFICATE_FONTS[family]
+            weight = bold_weight if key in ("name", "title") else 400
             size, lines = fit_certificate_text(
                 value, box, key in ("name", "title"), orientation
             )
             content = "<br>".join(escape(line) for line in lines)
             elements.append(
-                f'<div class="element {key}" style="{style}font-size:{size}px"><span>{content}</span></div>'
+                f'<div class="element {key}" style="{style}font-size:{size}px;'
+                f'font-family:{family_name};font-weight:{weight}"><span>{content}</span></div>'
             )
     html = (
-        """<html><head><meta charset="utf-8"><style>
-    @font-face{font-family:Mont;src:url('certificate-font:regular')}
-    @font-face{font-family:Mont;src:url('certificate-font:bold');font-weight:600}
+        '<html><head><meta charset="utf-8"><style>'
+        + "".join(
+            f"@font-face{{font-family:'{name}';src:url('certificate-font:{key}:regular');font-weight:400}}"
+            + (
+                f"@font-face{{font-family:'{name}';src:url('certificate-font:{key}:bold');font-weight:{bold_weight}}}"
+                if bold_weight != 400
+                else ""
+            )
+            for key, (name, _, _, bold_weight) in CERTIFICATE_FONTS.items()
+        )
+        + """
     @page{size:PAGE_WIDTHmm PAGE_HEIGHTmm;margin:0}*{box-sizing:border-box}body{margin:0;font-family:Mont;color:#353535}
     .sheet{position:relative;width:PAGE_WIDTHmm;height:PAGE_HEIGHTmm;overflow:hidden;background:white}
     .background{position:absolute;width:100%;height:100%;object-fit:contain}
     .element{position:absolute;text-align:center;line-height:1.3;overflow:hidden;padding:1px}
     .element span{position:absolute;left:1px;right:1px;top:50%;transform:translateY(-50%);white-space:nowrap}
-    .name,.title{font-weight:600}.signature{object-fit:contain}
+    .signature{object-fit:contain}
     </style></head><body><div class="sheet">""".replace(
             "PAGE_WIDTH", str(page_width)
         ).replace(