Prevent NPE on partial match of compare URL and allow short SHA1 compare URLs (#18472)

* Don't panic & allow shorter sha1

- Don't panic when the full regex isn't matched and allow the usage of a
shorter sha1 being used.
- Resolves #18471

* Update modules/markup/html.go

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
This commit is contained in:
Gusted 2022-01-31 00:48:47 +01:00 committed by GitHub
parent b2250d2fb3
commit 72256c16a8
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2 changed files with 21 additions and 1 deletions

View File

@ -55,7 +55,7 @@ var (
anySHA1Pattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{40})(/[-+~_%.a-zA-Z0-9/]+)?(#[-+~_%.a-zA-Z0-9]+)?`)
// comparePattern matches "http://domain/org/repo/compare/COMMIT1...COMMIT2#hash"
comparePattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{40})(\.\.\.?)([0-9a-f]{40})?(#[-+~_%.a-zA-Z0-9]+)?`)
comparePattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{7,40})(\.\.\.?)([0-9a-f]{7,40})?(#[-+~_%.a-zA-Z0-9]+)?`)
validLinksPattern = regexp.MustCompile(`^[a-z][\w-]+://`)
@ -946,6 +946,13 @@ func comparePatternProcessor(ctx *RenderContext, node *html.Node) {
return
}
// Ensure that every group (m[0]...m[7]) has a match
for i := 0; i < 8; i++ {
if m[i] == -1 {
return
}
}
urlFull := node.Data[m[0]:m[1]]
text1 := base.ShortSha(node.Data[m[2]:m[3]])
textDots := base.ShortSha(node.Data[m[4]:m[5]])

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@ -548,3 +548,16 @@ func TestFuzz(t *testing.T) {
assert.NoError(t, err)
}
func TestIssue18471(t *testing.T) {
data := `http://domain/org/repo/compare/783b039...da951ce`
var res strings.Builder
err := PostProcess(&RenderContext{
URLPrefix: "https://example.com",
Metas: localMetas,
}, strings.NewReader(data), &res)
assert.NoError(t, err)
assert.Equal(t, res.String(), "<a href=\"http://domain/org/repo/compare/783b039...da951ce\" class=\"compare\"><code class=\"nohighlight\">783b039...da951ce</code></a>")
}