go/markdown
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Implemented image links

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This commit is contained in:
Eduard Urbach 2024-04-03 21:13:59 +02:00
parent 463c8b4a85
commit 809b89d689
Signed by: akyoto
GPG Key ID: C874F672B1AF20C0
3 changed files with 62 additions and 31 deletions
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8
README.md
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@ -9,6 +9,7 @@ A markdown renderer that supports only a subset of the CommonMark spec in order
- Italic
- Links
- Lists
- Images
- Headers
- Paragraphs
- Quotes
@ -38,6 +39,7 @@ PASS: TestItalic
PASS: TestBold
PASS: TestStrike
PASS: TestLink
PASS: TestImage
PASS: TestList
PASS: TestTables
PASS: TestCode
@ -51,9 +53,9 @@ coverage: 100.0% of statements
## Benchmarks
```
BenchmarkSmall-12 5836533 205.3 ns/op 32 B/op 1 allocs/op
BenchmarkMedium-12 967740 1103 ns/op 512 B/op 1 allocs/op
BenchmarkLarge-12 277908 4099 ns/op 2560 B/op 2 allocs/op
BenchmarkSmall-12 5884641 201.5 ns/op 32 B/op 1 allocs/op
BenchmarkMedium-12 938371 1124 ns/op 512 B/op 1 allocs/op
BenchmarkLarge-12 277065 4115 ns/op 2560 B/op 2 allocs/op
```
## License

32
Render.go
View File

@ -279,6 +279,7 @@ func (r *renderer) writeText(markdown string) {
searchStart = 0
linkTextStart = -1
linkTextEnd = -1
linkIsImage = false
emStart = -1
strongStart = -1
strikeStart = -1
@ -286,7 +287,7 @@ func (r *renderer) writeText(markdown string) {
begin:
for {
i := strings.IndexAny(markdown[searchStart:], "[]()`*_~")
i := strings.IndexAny(markdown[searchStart:], "[]()`*_~!")
if i == -1 {
r.WriteString(html.EscapeString(markdown[tokenStart:]))
@ -332,11 +333,19 @@ begin:
linkText := markdown[linkTextStart+1 : linkTextEnd]
linkURL := markdown[i+1 : urlEnd]
r.WriteString("<a href=\"")
r.WriteString(sanitizeURL(linkURL))
r.WriteString("\">")
r.WriteString(html.EscapeString(linkText))
r.WriteString("</a>")
if linkIsImage {
r.WriteString("<img src=\"")
r.WriteString(sanitizeURL(linkURL))
r.WriteString("\" alt=\"")
r.WriteString(html.EscapeString(linkText))
r.WriteString("\">")
} else {
r.WriteString("<a href=\"")
r.WriteString(sanitizeURL(linkURL))
r.WriteString("\">")
r.WriteString(html.EscapeString(linkText))
r.WriteString("</a>")
}
linkTextStart = -1
linkTextEnd = -1
@ -402,6 +411,17 @@ begin:
tokenStart = i
strikeStart = i + 2
}
case '!':
if i+1 >= len(markdown) || markdown[i+1] != '[' {
continue
}
r.WriteString(html.EscapeString(markdown[tokenStart:i]))
tokenStart = i
linkTextStart = i + 1
searchStart++
linkIsImage = true
}
}
}

53
Render_test.go
View File

@ -45,13 +45,22 @@ func TestStrike(t *testing.T) {
}
func TestLink(t *testing.T) {
assert.Equal(t, markdown.Render("[text](https://example.com/)"), "<p><a href=\"https://example.com/\">text</a></p>")
assert.Equal(t, markdown.Render("[text](https://example.com/"), "<p>[text](https://example.com/</p>")
assert.Equal(t, markdown.Render("[text]https://example.com/)"), "<p>[text]https://example.com/)</p>")
assert.Equal(t, markdown.Render("[text(https://example.com/)"), "<p>[text(https://example.com/)</p>")
assert.Equal(t, markdown.Render("text](https://example.com/)"), "<p>text](https://example.com/)</p>")
assert.Equal(t, markdown.Render("[text](https://example.com/_test_)"), "<p><a href=\"https://example.com/_test_\">text</a></p>")
assert.Equal(t, markdown.Render("Prefix [text](https://example.com/) suffix."), "<p>Prefix <a href=\"https://example.com/\">text</a> suffix.</p>")
assert.Equal(t, markdown.Render("[text](https://example.com/)"), `<p><a href="https://example.com/">text</a></p>`)
assert.Equal(t, markdown.Render("[text](https://example.com/"), `<p>[text](https://example.com/</p>`)
assert.Equal(t, markdown.Render("[text]https://example.com/)"), `<p>[text]https://example.com/)</p>`)
assert.Equal(t, markdown.Render("[text(https://example.com/)"), `<p>[text(https://example.com/)</p>`)
assert.Equal(t, markdown.Render("text](https://example.com/)"), `<p>text](https://example.com/)</p>`)
assert.Equal(t, markdown.Render("[text](https://example.com/_test_)"), `<p><a href="https://example.com/_test_">text</a></p>`)
assert.Equal(t, markdown.Render("Prefix [text](https://example.com/) suffix."), `<p>Prefix <a href="https://example.com/">text</a> suffix.</p>`)
}
func TestImage(t *testing.T) {
assert.Equal(t, markdown.Render("!"), `<p>!</p>`)
assert.Equal(t, markdown.Render("!["), `<p>![</p>`)
assert.Equal(t, markdown.Render("![]"), `<p>![]</p>`)
assert.Equal(t, markdown.Render("![]("), `<p>![](</p>`)
assert.Equal(t, markdown.Render("![]()"), `<p><img src="" alt=""></p>`)
assert.Equal(t, markdown.Render("![title](https://example.com/image.png)"), `<p><img src="https://example.com/image.png" alt="title"></p>`)
}
func TestList(t *testing.T) {
@ -97,22 +106,22 @@ func TestSeparator(t *testing.T) {
}
func TestCombined(t *testing.T) {
assert.Equal(t, markdown.Render("# Header\n\nLine 1."), "<h1>Header</h1><p>Line 1.</p>")
assert.Equal(t, markdown.Render("# Header\nLine 1.\nLine 2.\nLine 3."), "<h1>Header</h1><p>Line 1. Line 2. Line 3.</p>")
assert.Equal(t, markdown.Render("# Header 1\nLine 1.\n# Header 2\nLine 2."), "<h1>Header 1</h1><p>Line 1.</p><h1>Header 2</h1><p>Line 2.</p>")
assert.Equal(t, markdown.Render("# [Header Link](https://example.com/)"), "<h1><a href=\"https://example.com/\">Header Link</a></h1>")
assert.Equal(t, markdown.Render("# Title\n\n- Entry 1\n- Entry 2\n\nText."), "<h1>Title</h1><ul><li>Entry 1</li><li>Entry 2</li></ul><p>Text.</p>")
assert.Equal(t, markdown.Render("- Entry\n# Header"), "<ul><li>Entry</li></ul><h1>Header</h1>")
assert.Equal(t, markdown.Render("> - Entry\n> # Header"), "<blockquote><ul><li>Entry</li></ul><h1>Header</h1></blockquote>")
assert.Equal(t, markdown.Render("> **bold** and *italic* text."), "<blockquote><p><strong>bold</strong> and <em>italic</em> text.</p></blockquote>")
assert.Equal(t, markdown.Render("> __bold__ and _italic_ text."), "<blockquote><p><strong>bold</strong> and <em>italic</em> text.</p></blockquote>")
assert.Equal(t, markdown.Render("# Header\n\nLine 1."), `<h1>Header</h1><p>Line 1.</p>`)
assert.Equal(t, markdown.Render("# Header\nLine 1.\nLine 2.\nLine 3."), `<h1>Header</h1><p>Line 1. Line 2. Line 3.</p>`)
assert.Equal(t, markdown.Render("# Header 1\nLine 1.\n# Header 2\nLine 2."), `<h1>Header 1</h1><p>Line 1.</p><h1>Header 2</h1><p>Line 2.</p>`)
assert.Equal(t, markdown.Render("# [Header Link](https://example.com/)"), `<h1><a href="https://example.com/">Header Link</a></h1>`)
assert.Equal(t, markdown.Render("# Title\n\n- Entry 1\n- Entry 2\n\nText."), `<h1>Title</h1><ul><li>Entry 1</li><li>Entry 2</li></ul><p>Text.</p>`)
assert.Equal(t, markdown.Render("- Entry\n# Header"), `<ul><li>Entry</li></ul><h1>Header</h1>`)
assert.Equal(t, markdown.Render("> - Entry\n> # Header"), `<blockquote><ul><li>Entry</li></ul><h1>Header</h1></blockquote>`)
assert.Equal(t, markdown.Render("> **bold** and *italic* text."), `<blockquote><p><strong>bold</strong> and <em>italic</em> text.</p></blockquote>`)
assert.Equal(t, markdown.Render("> __bold__ and _italic_ text."), `<blockquote><p><strong>bold</strong> and <em>italic</em> text.</p></blockquote>`)
}
func TestSecurity(t *testing.T) {
assert.Equal(t, markdown.Render("[text](javascript:alert(\"xss\"))"), "<p><a href=\"\">text</a></p>")
assert.Equal(t, markdown.Render("[text](javAscRipt:alert(\"xss\"))"), "<p><a href=\"\">text</a></p>")
assert.Equal(t, markdown.Render("[text]( javascript:alert(\"xss\"))"), "<p><a href=\"\">text</a></p>")
assert.Equal(t, markdown.Render("[text]('javAscRipt:alert(\"xss\")')"), "<p><a href=\"&#39;javAscRipt:alert(&#34;xss&#34;)&#39;\">text</a></p>")
assert.Equal(t, markdown.Render("[text](\"><script>alert(123)</script>)"), "<p><a href=\"&#34;&gt;&lt;script&gt;alert(123)&lt;/script&gt;\">text</a></p>")
assert.Equal(t, markdown.Render("[<script>alert(123)</script>]()"), "<p><a href=\"\">&lt;script&gt;alert(123)&lt;/script&gt;</a></p>")
assert.Equal(t, markdown.Render(`[text](javascript:alert("xss"))`), `<p><a href="">text</a></p>`)
assert.Equal(t, markdown.Render(`[text](javAscRipt:alert("xss"))`), `<p><a href="">text</a></p>`)
assert.Equal(t, markdown.Render(`[text]( javascript:alert("xss"))`), `<p><a href="">text</a></p>`)
assert.Equal(t, markdown.Render(`[text]('javAscRipt:alert("xss")')`), `<p><a href="&#39;javAscRipt:alert(&#34;xss&#34;)&#39;">text</a></p>`)
assert.Equal(t, markdown.Render(`[text]("><script>alert(123)</script>)`), `<p><a href="&#34;&gt;&lt;script&gt;alert(123)&lt;/script&gt;">text</a></p>`)
assert.Equal(t, markdown.Render(`[<script>alert(123)</script>]()`), `<p><a href="">&lt;script&gt;alert(123)&lt;/script&gt;</a></p>`)
}