unjs
diff --git a/‎src/providers/fontshare.ts‎
Lines changed: 12 additions & 1 deletion b/‎src/providers/fontshare.ts‎
Lines changed: 12 additions & 1 deletion
diff --git a/‎test/providers/fontshare.test.ts‎
Lines changed: 11 additions & 2 deletions b/‎test/providers/fontshare.test.ts‎
Lines changed: 11 additions & 2 deletions
@@ -90,7 +90,18 @@ export default defineFontProvider('fontshare', async (_options, ctx) => {
 
     const css = await ctx.fetch(`${BASE_URL}/css?f[]=${font.slug}@${numbers.join(',')}`).then(res => res.text())
 
-    return cleanFontFaces(extractFontFaceData(css), options.formats)
+    const fontFaces = extractFontFaceData(css)
+    for (const face of fontFaces) {
+      for (const source of face.src) {
+        // fontshare serves protocol-relative URLs, which are only resolvable from within a
+        // stylesheet loaded over http(s)
+        if ('url' in source && source.url.startsWith('//')) {
+          source.url = `https:${source.url}`
+        }
+      }
+    }
+
+    return cleanFontFaces(fontFaces, options.formats)
   }
 
   return {
 
@@ -19,7 +19,7 @@ describe('fontshare', () => {
           "src": [
             {
               "format": "woff2",
-              "url": "//cdn.fontshare.com/font",
+              "url": "https://cdn.fontshare.com/font",
             },
           ],
           "style": "normal",
@@ -41,7 +41,7 @@ describe('fontshare', () => {
           "src": [
             {
               "format": "woff2",
-              "url": "//cdn.fontshare.com/font",
+              "url": "https://cdn.fontshare.com/font",
             },
           ],
           "style": "italic",
@@ -51,6 +51,15 @@ describe('fontshare', () => {
     `)
   })
 
+  it('returns absolute font URLs', async () => {
+    const unifont = await createUnifont([providers.fontshare()])
+    const { fonts } = await unifont.resolveFont('Satoshi', { styles: ['normal'] })
+    const urls = fonts.flatMap(font => font.src.flatMap(source => 'url' in source ? source.url : []))
+
+    expect(urls.length).toBeGreaterThan(0)
+    expect(urls.every(url => url.startsWith('https://'))).toBe(true)
+  })
+
   it('supports variable fonts', async () => {
     const unifont = await createUnifont([providers.fontshare()])
     const { fonts } = await unifont.resolveFont('Satoshi', { weights: ['300 900'] })