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Make Mermaid.js limit configurable (#16519)

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* Make Mermaid.js limit configurable

Add `MERMAID_MAX_SOURCE_CHARACTERS` to `[markup]` settings
to make the maximum size of a mermaid render configurable.

Fix #16513

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fixup! Make Mermaid.js limit configurable

* Update custom/conf/app.example.ini

Co-authored-by: silverwind <me@silverwind.io>

* Update docs/content/doc/advanced/config-cheat-sheet.en-us.md

Co-authored-by: silverwind <me@silverwind.io>

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
zeripath 2021-07-24 05:21:51 +01:00 committed by GitHub
parent 342f338bda
commit f135a818f5
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 22 additions and 5 deletions
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9
custom/conf/app.example.ini
View file

@ -1985,6 +1985,15 @@ PATH =
;; Show template execution time in the footer
;SHOW_FOOTER_TEMPLATE_LOAD_TIME = true
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;[markup]
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Set the maximum number of characters in a mermaid source. (Set to -1 to disable limits)
;MERMAID_MAX_SOURCE_CHARACTERS = 5000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;[markup.sanitizer.1]

2
docs/content/doc/advanced/config-cheat-sheet.en-us.md
View file

@ -882,6 +882,8 @@ NB: You must have `DISABLE_ROUTER_LOG` set to `false` for this option to take ef
## Markup (`markup`)
- `MERMAID_MAX_SOURCE_CHARACTERS`: **5000**: Set the maximum size of a Mermaid source. (Set to -1 to disable)
Gitea can support Markup using external tools. The example below will add a markup named `asciidoc`.
```ini

6
modules/setting/markup.go
View file

@ -15,8 +15,9 @@ import (
// ExternalMarkupRenderers represents the external markup renderers
var (
ExternalMarkupRenderers []*MarkupRenderer
ExternalSanitizerRules []MarkupSanitizerRule
ExternalMarkupRenderers []*MarkupRenderer
ExternalSanitizerRules []MarkupSanitizerRule
MermaidMaxSourceCharacters int
)
// MarkupRenderer defines the external parser configured in ini
@ -40,6 +41,7 @@ type MarkupSanitizerRule struct {
}
func newMarkup() {
MermaidMaxSourceCharacters = Cfg.Section("markup").Key("MERMAID_MAX_SOURCE_CHARACTERS").MustInt(5000)
ExternalMarkupRenderers = make([]*MarkupRenderer, 0, 10)
ExternalSanitizerRules = make([]MarkupSanitizerRule, 0, 10)

3
modules/templates/helper.go
View file

@ -390,6 +390,9 @@ func NewFuncMap() []template.FuncMap {
html += "</span>"
return template.HTML(html)
},
"MermaidMaxSourceCharacters": func() int {
return setting.MermaidMaxSourceCharacters
},
}}
}

1
templates/base/head.tmpl
View file

@ -60,6 +60,7 @@
{{ end }}
]).values()),
{{end}}
MermaidMaxSourceCharacters: {{MermaidMaxSourceCharacters}},
};
</script>
<link rel="icon" href="{{AssetUrlPrefix}}/img/logo.svg" type="image/svg+xml">

6
web_src/js/markup/mermaid.js
View file

@ -1,4 +1,4 @@
const MAX_SOURCE_CHARACTERS = 5000;
const {MermaidMaxSourceCharacters} = window.config;
function displayError(el, err) {
el.closest('pre').classList.remove('is-loading');
@ -26,8 +26,8 @@ export async function renderMermaid(els) {
});
for (const el of els) {
if (el.textContent.length > MAX_SOURCE_CHARACTERS) {
displayError(el, new Error(`Mermaid source of ${el.textContent.length} characters exceeds the maximum allowed length of ${MAX_SOURCE_CHARACTERS}.`));
if (MermaidMaxSourceCharacters >= 0 && el.textContent.length > MermaidMaxSourceCharacters) {
displayError(el, new Error(`Mermaid source of ${el.textContent.length} characters exceeds the maximum allowed length of ${MermaidMaxSourceCharacters}.`));
continue;
}