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HTML escape included mermaid files to handle embedded tags #1580

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HTML escape included mermaid files to handle embedded tags #1580

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mgranell
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@mgranell mgranell commented May 27, 2021 •
edited by trusktr
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Summary

Fixes an issue where included mermaid files that had embedded tags failed to render, due to the file being included verbatim into the <div> tag, and embedded html within the mermaid file "breaking out" of the div.

e.g. the following mermaid file will fail:

graph TB
  linkStyle default fill:#ffffff

  14["&lt;div style='font-weight: bold'&gt;This will break&lt;/div&gt;&lt;div style='font-size: 70%; margin-top: 0px'&gt;[Software System]&lt;/div&gt;&lt;div style='font-size: 80%; margin-top:10px'&gt;Description&lt;br /&gt;with HTML&lt;/div&gt;"]

What kind of change does this PR introduce?

Bugfix

For any code change,

  • Related documentation has been updated if needed
  • Related tests have been updated or tests have been added
    There are no tests that test in the include functionality

Does this PR introduce a breaking change? (check one)

  • Yes
  • No

Related issue, if any:

Tested in the following browsers:

  • Chrome
  • Firefox
  • Safari
  • Edge
  • IE
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@sy-records sy-records requested a review from a team May 27, 2021 07:59
@mgranell
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Test failed due to timeout, not related to change
@sy-records
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Hi, @mgranell
Can you provide a screenshot of the before and after comparison?
I test here there is no difference.
trusktr
trusktr requested changes Aug 2, 2021
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src/core/render/embed.js
text: `<div class="mermaid">\n${text
.replace(/&/g, '&amp;')
.replace(/</g, '&lt;')
.replace(/"/g, '&quot;')}\n</div>`,
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Maybe we should use a more robust solution like described in the following SO question so that it accounts for other characters, not just those specific ones?

https://stackoverflow.com/questions/18749591/encode-html-entities-in-javascript
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