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Add a BlackFriday option for rel="noreferrer" on external links

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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
This commit is contained in:
Stefan Neuhaus 2018-05-27 23:20:39 +02:00 committed by Bjørn Erik Pedersen
parent 2174525cec
commit 20cbc2c785
3 changed files with 13 additions and 0 deletions
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5
docs/content/en/readfiles/bfconfig.md
View file

@ -48,6 +48,11 @@
Blackfriday flag: **`HTML_NOFOLLOW_LINKS`** <br> Blackfriday flag: **`HTML_NOFOLLOW_LINKS`** <br>
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`). 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`).
`noreferrerLinks`
: default: **`false`** <br>
Blackfriday flag: **`HTML_NOREFERRER_LINKS`** <br>
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`).
`plainIDAnchors` `plainIDAnchors`
: default **`true`** <br> : default **`true`** <br>
Blackfriday flag: **`FootnoteAnchorPrefix` and `HeaderIDSuffix`** <br> Blackfriday flag: **`FootnoteAnchorPrefix` and `HeaderIDSuffix`** <br>

6
helpers/content.go
View file

@ -109,6 +109,7 @@ type BlackFriday struct {
Fractions bool Fractions bool
HrefTargetBlank bool HrefTargetBlank bool
NofollowLinks bool NofollowLinks bool
NoreferrerLinks bool
SmartDashes bool SmartDashes bool
LatexDashes bool LatexDashes bool
TaskLists bool TaskLists bool
@ -126,6 +127,7 @@ func newBlackfriday(config map[string]interface{}) *BlackFriday {
"fractions": true, "fractions": true,
"hrefTargetBlank": false, "hrefTargetBlank": false,
"nofollowLinks": false, "nofollowLinks": false,
"noreferrerLinks": false,
"smartDashes": true, "smartDashes": true,
"latexDashes": true, "latexDashes": true,
"plainIDAnchors": true, "plainIDAnchors": true,
@ -283,6 +285,10 @@ func (c *ContentSpec) getHTMLRenderer(defaultFlags int, ctx *RenderingContext) b
htmlFlags |= blackfriday.HTML_NOFOLLOW_LINKS htmlFlags |= blackfriday.HTML_NOFOLLOW_LINKS
} }
if ctx.Config.NoreferrerLinks {
htmlFlags |= blackfriday.HTML_NOREFERRER_LINKS
}
if ctx.Config.SmartDashes { if ctx.Config.SmartDashes {
htmlFlags |= blackfriday.HTML_SMARTYPANTS_DASHES htmlFlags |= blackfriday.HTML_SMARTYPANTS_DASHES
} }

2
helpers/content_test.go
View file

@ -205,6 +205,7 @@ func TestGetHTMLRendererAllFlags(t *testing.T) {
{blackfriday.HTML_SMARTYPANTS_FRACTIONS}, {blackfriday.HTML_SMARTYPANTS_FRACTIONS},
{blackfriday.HTML_HREF_TARGET_BLANK}, {blackfriday.HTML_HREF_TARGET_BLANK},
{blackfriday.HTML_NOFOLLOW_LINKS}, {blackfriday.HTML_NOFOLLOW_LINKS},
{blackfriday.HTML_NOREFERRER_LINKS},
{blackfriday.HTML_SMARTYPANTS_DASHES}, {blackfriday.HTML_SMARTYPANTS_DASHES},
{blackfriday.HTML_SMARTYPANTS_LATEX_DASHES}, {blackfriday.HTML_SMARTYPANTS_LATEX_DASHES},
} }
@ -214,6 +215,7 @@ func TestGetHTMLRendererAllFlags(t *testing.T) {
ctx.Config.Fractions = true ctx.Config.Fractions = true
ctx.Config.HrefTargetBlank = true ctx.Config.HrefTargetBlank = true
ctx.Config.NofollowLinks = true ctx.Config.NofollowLinks = true
ctx.Config.NoreferrerLinks = true
ctx.Config.LatexDashes = true ctx.Config.LatexDashes = true
ctx.Config.PlainIDAnchors = true ctx.Config.PlainIDAnchors = true
ctx.Config.SmartDashes = true ctx.Config.SmartDashes = true