Checked HtmlMarkup, tag policies, line framers and MXP secure lines - #12
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Consumers were each re-implementing what the library should own:
- HtmlMarkup took a raw tag name and attribute string and wrote both
unchecked. HtmlMarkup.Tag builds one from a checked name and encoded
HtmlAttributes; TryParseAttributes reads a raw string with values decoded
as a client reads them; HtmlTagPolicy (BrowserSafe, WellFormed, or your
own via `with`) keeps only the tags and attributes it allows, with
addresses checked against UrlSafety and refused if they hide whitespace.
- WithHtml(policy) / HtmlTagEmitter(format, policy) holds every tag rendered
in Html to the policy as it is written, so deserialised or unchecked
markup cannot reach a browser unfiltered. Pueblo and MXP are unchanged.
- MXP output needs ESC[1z on every line or the client prints the tags; each
consumer was prefixing lines itself. ILineFramer is a per-line framer slot
in the registry, and MxpSecureLineFramer / WithMxpSecureLines() supplies
MXP's, opt-in for the registry that renders for a connection.
The guides presented HtmlMarkup.Create("send", ...) as a portable link.
<send> is MXP's command link and a Pueblo client prints it; they now build
links with LinkKind.Command, and the formats guide documents how Pueblo and
MXP differ. It also no longer claims TextEncoding.Html escapes quotes.
All additive; package validation against 2.1.0 passes.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. WalkthroughThe change adds checked HTML construction, configurable HTML tag policies, policy-aware rendering, and opt-in MXP secure-line framing. It also updates portable link examples and related documentation. ChangesMarkup output safeguards and framing
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)HTML policy renderingsequenceDiagram
participant Caller
participant HtmlTagEmitter
participant HtmlTagPolicy
participant HtmlMarkup
Caller->>HtmlTagEmitter: Emit unchecked markup
HtmlTagEmitter->>HtmlTagPolicy: Apply policy
HtmlTagPolicy->>HtmlMarkup: Return accepted markup or rejection
HtmlTagEmitter-->>Caller: Write accepted tag or body only
Secure MXP line renderingsequenceDiagram
participant Caller
participant MarkupTextRenderer
participant MarkupRegistry
participant MxpSecureLineFramer
Caller->>MarkupTextRenderer: Render with registry
MarkupTextRenderer->>MarkupRegistry: FindLineFramer(Mxp)
MarkupRegistry-->>MarkupTextRenderer: Return secure line framer
MarkupTextRenderer->>MxpSecureLineFramer: WriteLineStart(output)
MxpSecureLineFramer-->>MarkupTextRenderer: Write ESC[1z
MarkupTextRenderer-->>Caller: Return framed MXP output
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 48.53% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 14 files. (9 skipped: 9 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@MarkupString.Html/HtmlTagPolicy.cs`:
- Line 90: Update the tag and attribute policy checks to use ordinal
case-insensitive matching independently of the comparers configured on
AllowedTags, AllowedAttributes, and UrlAttributes. In the tag validation and
Allows(HtmlAttribute) paths, replace direct set membership checks with a shared
ContainsIgnoringCase helper that preserves fast exact matches and performs
StringComparison.OrdinalIgnoreCase fallback.
In `@MarkupString/MarkupTextRenderer.cs`:
- Around line 106-107: Update the rendering flow around RenderUnframedLines and
WriteFramedLines so the IFormatFramer preamble is written directly before
framing the body, and the epilogue is written directly afterward without line
prefixes. Keep the existing emitted-state calculation passed to WriteEpilogue
unchanged.
In `@README.md`:
- Line 40: Update the README package-table description for MarkupString.Html to
remove the claim that it provides emitter-class stylesheets, or direct that
stylesheet functionality to MarkupString.Ansi instead; retain the existing
description of raw HTML markup, checked construction, and tag policies.
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📒 Files selected for processing (22)
CHANGELOG.mdMarkupString.Ansi/AnsiRegistration.csMarkupString.Ansi/MxpSecureLineFramer.csMarkupString.Ansi/PublicAPI.Unshipped.txtMarkupString.Ansi/README.mdMarkupString.Html/Emitters/HtmlTagEmitter.csMarkupString.Html/HtmlAttribute.csMarkupString.Html/HtmlMarkup.csMarkupString.Html/HtmlRegistration.csMarkupString.Html/HtmlTagPolicy.csMarkupString.Html/MarkupString.Html.csprojMarkupString.Html/PublicAPI.Unshipped.txtMarkupString.Html/README.mdMarkupString.Tests/Ansi/MxpSecureLineFramerTests.csMarkupString.Tests/Html/HtmlTagPolicyTests.csMarkupString/ILineFramer.csMarkupString/MarkupRegistry.csMarkupString/MarkupTextRenderer.csMarkupString/PublicAPI.Unshipped.txtREADME.mddocs/formats.mddocs/getting-started.md
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…ruction MxpSecureLineFramer frames the Mxp format, whichever package wrote the tags (HtmlMarkup's as much as AnsiMarkup's links), so it and WithMxpSecureLines() belong to the core package beside ILineFramer, not to MarkupString.Ansi. HtmlTagPolicy's allowed-tag and -attribute sets were case-insensitive only if the caller built them that way; a plain HashSet made a policy silently case-sensitive. The init accessors now copy into an OrdinalIgnoreCase FrozenSet. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…stylesheet claim A line framer prefixed the IFormatFramer preamble as if it were the first line, and would prefix an epilogue that began a line. The preamble and epilogue are now written around the framed body, so a document framer wraps the line framing: <pre>ESC[1z..., not ESC[1z<pre>.... The README and the MarkupString.Html package description credited it with the ms-* stylesheet, which is MarkupString.Ansi's AnsiCss. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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All three CodeRabbit findings are addressed and their threads resolved (case-insensitive policy sets, document framing wrapping line framing, and the stylesheet credit). CodeRabbit's pre-merge docstring coverage warning (55%) counts private helpers and test methods in the diff. Every new public member carries XML docs, and the |
BrowserSafe declared which tags and attributes are safe in a browser, which is the consuming application's decision, not this library's. Removed, and address checking is now off until a consumer names the attributes to check: AddressAttributes (was DefaultUrlAttributes) is published as the list HTML gives an address to, and nothing applies it on its own. WellFormed remains the starting point to narrow with `with`, and the README carries the worked example a consumer would write. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Why
While fixing a SharpMUSH bug (MXP clients shown literal
<a xch_cmd=…>; SharpMUSH/SharpMUSH#1195), several workarounds turned out to be things this library should own. Each consumer was re-implementing them, or not implementing them at all:HtmlMarkup.HtmlMarkupwrites its tag name and attribute string unchecked. SharpMUSH had to write its own attribute parser, allowlist and encoder to keep softcode from injecting script into the web portal.ESC[1zon every line, and SharpMUSH prefixed lines itself after rendering.HtmlMarkup.Create("send", …)as a portable link.<send>is MXP's command link, and a Pueblo client prints it as text.What's added (all additive; package validation against 2.1.0 passes)
MarkupString.Html
HtmlAttribute(Name, Value), which writesname="value"with the value encoded. Only& " < >are encoded; accented text is left alone.HtmlMarkup.Tag(name, params attributes), which checks the tag and attribute names.IsValidTagNameandIsValidAttributeName.TryParseAttributes, which decodes values the way a client would, sojavascript:is checked asjavascript:.HtmlTagPolicy(its sets are copied case-insensitive, whatever comparer the caller's set had): settings for allowed tags, allowed attributes and address-bearing attributes, plus what happens on a bad attribute (DropAttribute/DropAllAttributes). It hasTryCreateandApply. It is machinery, not a security posture:WellFormedallows any well-formed tag, address checking stays off until a consumer names the attributes to check (their own list, or the publishedAddressAttributes), and a policy is a record, sowithnarrows one to whatever the application considers safe. What is safe in a given medium is the consumer's call, not this library's.WithHtml(HtmlTagPolicy)andHtmlTagEmitter(format, policy). Every tag rendered inHtmlis held to the policy as it's written; a refused tag leaves its body unwrapped. Pueblo and MXP output is unchanged unless a policy is registered for them too.MarkupString
ILineFramer, plusMarkupRegistry.With(ILineFramer)andFindLineFramer. It writes a prefix before every line that has content. It has its own slot besideIFormatFramer, so it doesn't displace a document framer.MxpSecureLineFramerandMarkupRegistry.WithMxpSecureLines(). They live in core rather than the Ansi package because they frame theMxpformat: tags written byHtmlMarkupneed the line opened just as much asAnsiMarkup's links do.MXPProtocol); this only frames the text sent afterwards.Docs
LinkKind.Command.TextEncoding.Htmlescapes".Verification
HtmlTagPolicyTestsandMxpSecureLineFramerTests.dotnet packpackage validation against 2.1.0 is clean.Follow-up (3.0, not in this PR)
AnsiMarkupinto a coreLinkMarkup, carryingUrlSafetyand MXP multi-command menus with it.HtmlMarkuplinks.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Documentation