Eliminate blog settings page helpers — pure .sx defpages with service data

Convert 6 blog settings pages (settings-home, cache, snippets, menu-items,
tag-groups, tag-group-edit) from Python page helpers to .sx defpages with
(service "blog-page" ...) IO primitives. Create data-driven defcomps that
handle iteration via (map ...) instead of Python loops.

Post-related page helpers (editor, post-admin/data/preview/entries/settings/edit)
remain as Python helpers — they depend on _ensure_post_data and sx_components
rendering functions that need separate conversion.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blog/services/__init__.py

@@ -76,3 +76,6 @@ def register_domain_services() -> None:
     if not services.has("federation"):
         from shared.services.federation_impl import SqlFederationService
         services.federation = SqlFederationService()
+
+    from .blog_page import BlogPageService
+    services.register("blog_page", BlogPageService())

blog/services/blog_page.py

@@ -0,0 +1,234 @@
+"""Blog page data service — provides serialized dicts for .sx defpages."""
+from __future__ import annotations
+
+
+class BlogPageService:
+    """Service for blog page data, callable via (service "blog-page" ...)."""
+
+    async def cache_data(self, session, **kw):
+        from quart import url_for as qurl
+        from shared.browser.app.csrf import generate_csrf_token
+        return {
+            "clear_url": qurl("settings.cache_clear"),
+            "csrf": generate_csrf_token(),
+        }
+
+    async def snippets_data(self, session, **kw):
+        from quart import g, url_for as qurl
+        from sqlalchemy import select, or_
+        from models import Snippet
+        from shared.browser.app.csrf import generate_csrf_token
+
+        uid = g.user.id
+        is_admin = g.rights.get("admin")
+        csrf = generate_csrf_token()
+        filters = [Snippet.user_id == uid, Snippet.visibility == "shared"]
+        if is_admin:
+            filters.append(Snippet.visibility == "admin")
+        rows = (await session.execute(
+            select(Snippet).where(or_(*filters)).order_by(Snippet.name)
+        )).scalars().all()
+
+        snippets = []
+        for s in rows:
+            s_id = s.id
+            s_vis = s.visibility or "private"
+            s_uid = s.user_id
+            owner = "You" if s_uid == uid else f"User #{s_uid}"
+            can_delete = s_uid == uid or is_admin
+            d = {
+                "id": s_id,
+                "name": s.name or "",
+                "visibility": s_vis,
+                "owner": owner,
+                "can_delete": can_delete,
+            }
+            if is_admin:
+                d["patch_url"] = qurl("snippets.patch_visibility", snippet_id=s_id)
+            if can_delete:
+                d["delete_url"] = qurl("snippets.delete_snippet", snippet_id=s_id)
+            snippets.append(d)
+        return {
+            "snippets": snippets,
+            "is_admin": bool(is_admin),
+            "csrf": csrf,
+        }
+
+    async def menu_items_data(self, session, **kw):
+        from quart import url_for as qurl
+        from bp.menu_items.services.menu_items import get_all_menu_items
+        from shared.browser.app.csrf import generate_csrf_token
+
+        menu_items = await get_all_menu_items(session)
+        csrf = generate_csrf_token()
+        items = []
+        for mi in menu_items:
+            i_id = mi.id
+            label = mi.label or ""
+            fi = getattr(mi, "feature_image", None)
+            sort = mi.position or 0
+            items.append({
+                "id": i_id,
+                "label": label,
+                "url": mi.url or "",
+                "sort_order": sort,
+                "feature_image": fi,
+                "edit_url": qurl("menu_items.edit_menu_item", item_id=i_id),
+                "delete_url": qurl("menu_items.delete_menu_item_route", item_id=i_id),
+            })
+        return {
+            "menu_items": items,
+            "new_url": qurl("menu_items.new_menu_item"),
+            "csrf": csrf,
+        }
+
+    async def tag_groups_data(self, session, **kw):
+        from quart import url_for as qurl
+        from sqlalchemy import select
+        from models.tag_group import TagGroup
+        from bp.blog.admin.routes import _unassigned_tags
+        from shared.browser.app.csrf import generate_csrf_token
+
+        groups_rows = list(
+            (await session.execute(
+                select(TagGroup).order_by(TagGroup.sort_order, TagGroup.name)
+            )).scalars()
+        )
+        unassigned = await _unassigned_tags(session)
+
+        groups = []
+        for g in groups_rows:
+            groups.append({
+                "id": g.id,
+                "name": g.name or "",
+                "slug": getattr(g, "slug", "") or "",
+                "feature_image": getattr(g, "feature_image", None),
+                "colour": getattr(g, "colour", None),
+                "sort_order": getattr(g, "sort_order", 0) or 0,
+                "edit_href": qurl("blog.tag_groups_admin.defpage_tag_group_edit", id=g.id),
+            })
+
+        unassigned_tags = []
+        for t in unassigned:
+            unassigned_tags.append({
+                "name": getattr(t, "name", "") if hasattr(t, "name") else t.get("name", ""),
+            })
+
+        return {
+            "groups": groups,
+            "unassigned_tags": unassigned_tags,
+            "create_url": qurl("blog.tag_groups_admin.create"),
+            "csrf": generate_csrf_token(),
+        }
+
+    async def tag_group_edit_data(self, session, *, id=None, **kw):
+        from quart import abort, url_for as qurl
+        from sqlalchemy import select
+        from models.tag_group import TagGroup, TagGroupTag
+        from models.ghost_content import Tag
+        from shared.browser.app.csrf import generate_csrf_token
+
+        tg = await session.get(TagGroup, id)
+        if not tg:
+            abort(404)
+
+        assigned_rows = list(
+            (await session.execute(
+                select(TagGroupTag.tag_id).where(TagGroupTag.tag_group_id == id)
+            )).scalars()
+        )
+        assigned_set = set(assigned_rows)
+
+        all_tags_rows = list(
+            (await session.execute(
+                select(Tag).where(
+                    Tag.deleted_at.is_(None),
+                    (Tag.visibility == "public") | (Tag.visibility.is_(None)),
+                ).order_by(Tag.name)
+            )).scalars()
+        )
+
+        all_tags = []
+        for t in all_tags_rows:
+            all_tags.append({
+                "id": t.id,
+                "name": getattr(t, "name", "") or "",
+                "feature_image": getattr(t, "feature_image", None),
+                "checked": t.id in assigned_set,
+            })
+
+        return {
+            "group": {
+                "id": tg.id,
+                "name": tg.name or "",
+                "colour": getattr(tg, "colour", "") or "",
+                "sort_order": getattr(tg, "sort_order", 0) or 0,
+                "feature_image": getattr(tg, "feature_image", "") or "",
+            },
+            "all_tags": all_tags,
+            "save_url": qurl("blog.tag_groups_admin.save", id=tg.id),
+            "delete_url": qurl("blog.tag_groups_admin.delete_group", id=tg.id),
+            "csrf": generate_csrf_token(),
+        }
+
+    async def post_admin_data(self, session, *, slug=None, **kw):
+        """Post admin panel — just needs post loaded into context."""
+        from quart import g
+        from sqlalchemy import select
+        from shared.models.page_config import PageConfig
+
+        # _ensure_post_data is called by before_request in defpage context
+        post = (g.post_data or {}).get("post", {})
+        features = {}
+        sumup_configured = False
+        if post.get("is_page"):
+            pc = (await session.execute(
+                select(PageConfig).where(
+                    PageConfig.container_type == "page",
+                    PageConfig.container_id == post["id"],
+                )
+            )).scalar_one_or_none()
+            if pc:
+                features = pc.features or {}
+                sumup_configured = bool(pc.sumup_api_key)
+        return {
+            "features": features,
+            "sumup_configured": sumup_configured,
+        }
+
+    async def preview_data(self, session, *, slug=None, **kw):
+        """Build preview data with prettified/rendered content."""
+        from quart import g
+        from models.ghost_content import Post
+        from sqlalchemy import select as sa_select
+
+        post_id = g.post_data["post"]["id"]
+        post = (await session.execute(
+            sa_select(Post).where(Post.id == post_id)
+        )).scalar_one_or_none()
+
+        result = {}
+        sx_content = getattr(post, "sx_content", None) or ""
+        if sx_content:
+            from shared.sx.prettify import sx_to_pretty_sx
+            result["sx_pretty"] = sx_to_pretty_sx(sx_content)
+        lexical_raw = getattr(post, "lexical", None) or ""
+        if lexical_raw:
+            from shared.sx.prettify import json_to_pretty_sx
+            result["json_pretty"] = json_to_pretty_sx(lexical_raw)
+        if sx_content:
+            from shared.sx.parser import parse as sx_parse
+            from shared.sx.html import render as sx_html_render
+            from shared.sx.jinja_bridge import _COMPONENT_ENV
+            try:
+                parsed = sx_parse(sx_content)
+                result["sx_rendered"] = sx_html_render(parsed, dict(_COMPONENT_ENV))
+            except Exception:
+                result["sx_rendered"] = "<em>Error rendering sx</em>"
+        if lexical_raw:
+            from bp.blog.ghost.lexical_renderer import render_lexical
+            try:
+                result["lex_rendered"] = render_lexical(lexical_raw)
+            except Exception:
+                result["lex_rendered"] = "<em>Error rendering lexical</em>"
+        return result