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Add a BlackFriday option for rel="noreferrer" on external links
Add a configuration option "noreferrerLinks". When set to "true" the "HTML_NOREFERRER_LINKS" flag is being passed to Blackfriday. Thereby all *absolute* links will get a "noreferrer" value for their "rel" attribute. See #4722
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@ -48,6 +48,11 @@
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Blackfriday flag: **`HTML_NOFOLLOW_LINKS`** <br>
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Purpose: `true` creates <s>external links</s> **absolute** links with `nofollow` being added to their `rel` attribute. Thereby crawlers are advised to not follow the link. While the `rel="nofollow"` attribute is typically used for external links, Blackfriday does that for _all_ absolute links. One needs to make note of this if they use absolute links throughout, for internal links too (for example, by setting `canonifyURLs` to `true` or via `absURL`).
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`noreferrerLinks`
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: default: **`false`** <br>
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Blackfriday flag: **`HTML_NOREFERRER_LINKS`** <br>
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Purpose: `true` creates <s>external links</s> **absolute** links with `noreferrer` being added to their `rel` attribute. Thus when following the link no referrer information will be leaked. While the `rel="noreferrer"` attribute is typically used for external links, Blackfriday does that for _all_ absolute links. One needs to make note of this if they use absolute links throughout, for internal links too (for example, by setting `canonifyURLs` to `true` or via `absURL`).
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`plainIDAnchors`
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: default **`true`** <br>
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Blackfriday flag: **`FootnoteAnchorPrefix` and `HeaderIDSuffix`** <br>
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@ -109,6 +109,7 @@ type BlackFriday struct {
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Fractions bool
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HrefTargetBlank bool
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NofollowLinks bool
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NoreferrerLinks bool
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SmartDashes bool
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LatexDashes bool
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TaskLists bool
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@ -126,6 +127,7 @@ func newBlackfriday(config map[string]interface{}) *BlackFriday {
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"fractions": true,
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"hrefTargetBlank": false,
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"nofollowLinks": false,
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"noreferrerLinks": false,
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"smartDashes": true,
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"latexDashes": true,
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"plainIDAnchors": true,
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@ -283,6 +285,10 @@ func (c *ContentSpec) getHTMLRenderer(defaultFlags int, ctx *RenderingContext) b
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htmlFlags |= blackfriday.HTML_NOFOLLOW_LINKS
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}
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if ctx.Config.NoreferrerLinks {
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htmlFlags |= blackfriday.HTML_NOREFERRER_LINKS
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}
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if ctx.Config.SmartDashes {
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htmlFlags |= blackfriday.HTML_SMARTYPANTS_DASHES
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}
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@ -205,6 +205,7 @@ func TestGetHTMLRendererAllFlags(t *testing.T) {
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{blackfriday.HTML_SMARTYPANTS_FRACTIONS},
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{blackfriday.HTML_HREF_TARGET_BLANK},
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{blackfriday.HTML_NOFOLLOW_LINKS},
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{blackfriday.HTML_NOREFERRER_LINKS},
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{blackfriday.HTML_SMARTYPANTS_DASHES},
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{blackfriday.HTML_SMARTYPANTS_LATEX_DASHES},
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}
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@ -214,6 +215,7 @@ func TestGetHTMLRendererAllFlags(t *testing.T) {
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ctx.Config.Fractions = true
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ctx.Config.HrefTargetBlank = true
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ctx.Config.NofollowLinks = true
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ctx.Config.NoreferrerLinks = true
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ctx.Config.LatexDashes = true
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ctx.Config.PlainIDAnchors = true
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ctx.Config.SmartDashes = true
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