fix: resolve markdown renderer under dashboard subpath (#63)

tests/test_markdown_renderer.py

@@ -1,9 +1,24 @@
 import json
 import subprocess
+from html.parser import HTMLParser
 from pathlib import Path
+from urllib.parse import urljoin
 
 
-RENDERER = Path(__file__).parent.parent / "frontend" / "markdown.js"
+FRONTEND = Path(__file__).parent.parent / "frontend"
+RENDERER = FRONTEND / "markdown.js"
+
+
+class ScriptSourceParser(HTMLParser):
+    def __init__(self):
+        super().__init__()
+        self.sources = []
+
+    def handle_starttag(self, tag, attrs):
+        if tag == "script":
+            source = dict(attrs).get("src")
+            if source:
+                self.sources.append(source)
 
 
 def test_markdown_renderer_escapes_raw_html_before_rendering_heading():
@@ -23,3 +38,15 @@ def test_markdown_renderer_escapes_raw_html_before_rendering_heading():
     assert result.stdout == (
         "<h1>&lt;img src=x onerror=alert(document.domain)&gt;</h1>"
     )
+
+
+def test_markdown_script_resolves_inside_dashboard_subpath():
+    parser = ScriptSourceParser()
+    parser.feed((FRONTEND / "index.html").read_text())
+    markdown_source = next(
+        source for source in parser.sources if source.endswith("markdown.js")
+    )
+
+    assert urljoin(
+        "https://forge.alexanderwhitestone.com/dashboard/", markdown_source
+    ) == "https://forge.alexanderwhitestone.com/dashboard/static/markdown.js"