fix: do not crash with data URLs (#1142)

src/plugins/postcss-url-parser.js

@@ -28,6 +28,10 @@ function shouldHandleRule(rule, decl, result) {
     return false;
   }
 
+  if (!isUrlRequestable(rule.url)) {
+    return false;
+  }
+
   return true;
 }
 
@@ -143,11 +147,6 @@ export default postcss.plugin(pluginName, (options) => async (css, result) => {
 
     normalizedUrl = normalizeUrl(normalizedUrl, isStringValue);
 
-    if (!isUrlRequestable(normalizedUrl)) {
-      // eslint-disable-next-line no-continue
-      continue;
-    }
-
     if (!options.filter(normalizedUrl)) {
       // eslint-disable-next-line no-continue
       continue;

src/utils.js

@@ -5,7 +5,7 @@
 import { fileURLToPath } from 'url';
 import path from 'path';
 
-import { urlToRequest, interpolateName, isUrlRequest } from 'loader-utils';
+import { urlToRequest, interpolateName } from 'loader-utils';
 import normalizePath from 'normalize-path';
 import cssesc from 'cssesc';
 import modulesValues from 'postcss-modules-values';
@@ -87,7 +87,7 @@ function requestify(url, rootContext) {
     return fileURLToPath(url);
   }
 
-  return mayBeServerRelativeUrl(url)
+  return url.charAt(0) === '/'
     ? urlToRequest(url, rootContext)
     : urlToRequest(url);
 }
@@ -508,31 +508,33 @@ async function resolveRequests(resolve, context, possibleRequests) {
     });
 }
 
-/*
- * May be url is server-relative url, but not //example.com
- * */
-function mayBeServerRelativeUrl(url) {
-  if (url.charAt(0) === '/' && !/^\/\//.test(url)) {
-    return true;
-  }
-
-  return false;
-}
-
 function isUrlRequestable(url) {
+  // Windows absolute paths
   if (matchNativeWin32Path.test(url)) {
     return false;
   }
 
-  if (mayBeServerRelativeUrl(url)) {
-    return true;
+  // Protocol-relative URLs
+  if (/^\/\//.test(url)) {
+    return false;
   }
 
+  // `file:` protocol
   if (/^file:/i.test(url)) {
     return true;
   }
 
-  return isUrlRequest(url);
+  // Absolute URLs
+  if (/^[a-z][a-z0-9+.-]*:/i.test(url)) {
+    return false;
+  }
+
+  // `#` URLs
+  if (/^#/.test(url)) {
+    return false;
+  }
+
+  return true;
 }
 
 function sort(a, b) {

test/fixtures/url/url.css

@@ -369,3 +369,7 @@ a {
   background: url('./something.png?foo=1&bar=2');
   background: url('./something.png?foo=2&bar=1');
 }
+
+.base {
+  background: url("data:image/svg+xml;charset=UTF-8,%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%3E%0A%3C!DOCTYPE%20svg%20PUBLIC%20%22-%2F%2FW3C%2F%2FDTD%20SVG%201.1%2F%2FEN%22%20%22http%3A%2F%2Fwww.w3.org%2FGraphics%2FSVG%2F1.1%2FDTD%2Fsvg11.dtd%22%3E%0A%3Csvg%20version%3D%221.1%22%20id%3D%22Layer_1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20x%3D%220px%22%20y%3D%220px%22%0A%09%20width%3D%22191px%22%20height%3D%22191px%22%20viewBox%3D%220%200%20191%20191%22%20enable-background%3D%22new%200%200%20191%20191%22%20xml%3Aspace%3D%22preserve%22%3E%0A%3Cpath%20fill%3D%22%23636363%22%20d%3D%22M95.5%2C0C42.8%2C0%2C0%2C42.8%2C0%2C95.5S42.8%2C191%2C95.5%2C191S191%2C148.2%2C191%2C95.5S148.2%2C0%2C95.5%2C0z%20M95.5%2C187.6%0A%09c-50.848%2C0-92.1-41.25-92.1-92.1c0-50.848%2C41.252-92.1%2C92.1-92.1c50.85%2C0%2C92.1%2C41.252%2C92.1%2C92.1%0A%09C187.6%2C146.35%2C146.35%2C187.6%2C95.5%2C187.6z%22%2F%3E%0A%3Cg%3E%0A%09%3Cpath%20fill%3D%22%23636363%22%20d%3D%22M92.9%2C10v8.6H91v-6.5c-0.1%2C0.1-0.2%2C0.2-0.4%2C0.3c-0.2%2C0.1-0.3%2C0.2-0.4%2C0.2c-0.1%2C0-0.3%2C0.1-0.5%2C0.2%0A%09%09c-0.2%2C0.1-0.3%2C0.1-0.5%2C0.1v-1.6c0.5-0.1%2C0.9-0.3%2C1.4-0.5c0.5-0.2%2C0.8-0.5%2C1.2-0.7h1.1V10z%22%2F%3E%0A%09%3Cpath%20fill%3D%22%23636363%22%20d%3D%22M97.1%2C17.1h3.602v1.5h-5.6V18c0-0.4%2C0.1-0.8%2C0.2-1.2c0.1-0.4%2C0.3-0.6%2C0.5-0.9c0.2-0.3%2C0.5-0.5%2C0.7-0.7%0A%09%09c0.2-0.2%2C0.5-0.4%2C0.7-0.6c0.199-0.2%2C0.5-0.3%2C0.6-0.5c0.102-0.2%2C0.301-0.3%2C0.5-0.5c0.2-0.2%2C0.2-0.3%2C0.301-0.5%0A%09%09c0.101-0.2%2C0.101-0.3%2C0.101-0.5c0-0.4-0.101-0.6-0.3-0.8c-0.2-0.2-0.4-0.3-0.801-0.3c-0.699%2C0-1.399%2C0.3-2.101%2C0.9v-1.6%0A%09%09c0.7-0.5%2C1.5-0.7%2C2.5-0.7c0.399%2C0%2C0.8%2C0.1%2C1.101%2C0.2c0.301%2C0.1%2C0.601%2C0.3%2C0.899%2C0.5c0.3%2C0.2%2C0.399%2C0.5%2C0.5%2C0.8%0A%09%09c0.101%2C0.3%2C0.2%2C0.6%2C0.2%2C1s-0.102%2C0.7-0.2%2C1c-0.099%2C0.3-0.3%2C0.6-0.5%2C0.8c-0.2%2C0.2-0.399%2C0.5-0.7%2C0.7c-0.3%2C0.2-0.5%2C0.4-0.8%2C0.6%0A%09%09c-0.2%2C0.1-0.399%2C0.3-0.5%2C0.4s-0.3%2C0.3-0.5%2C0.4s-0.2%2C0.3-0.3%2C0.4C97.1%2C17%2C97.1%2C17%2C97.1%2C17.1z%22%2F%3E%0A%3C%2Fg%3E%0A%3Cg%3E%0A%09%3Cpath%20fill%3D%22%23636363%22%20d%3D%22M15%2C95.4c0%2C0.7-0.1%2C1.4-0.2%2C2c-0.1%2C0.6-0.4%2C1.1-0.7%2C1.5C13.8%2C99.3%2C13.4%2C99.6%2C12.9%2C99.8s-1%2C0.3-1.5%2C0.3%0A%09%09c-0.7%2C0-1.3-0.1-1.8-0.3v-1.5c0.4%2C0.3%2C1%2C0.4%2C1.6%2C0.4c0.6%2C0%2C1.1-0.2%2C1.5-0.7c0.4-0.5%2C0.5-1.1%2C0.5-1.9l0%2C0%0A%09%09C12.8%2C96.7%2C12.3%2C96.9%2C11.5%2C96.9c-0.3%2C0-0.7-0.102-1-0.2c-0.3-0.101-0.5-0.3-0.8-0.5c-0.3-0.2-0.4-0.5-0.5-0.8%0A%09%09c-0.1-0.3-0.2-0.7-0.2-1c0-0.4%2C0.1-0.8%2C0.2-1.2c0.1-0.4%2C0.3-0.7%2C0.6-0.9c0.3-0.2%2C0.6-0.5%2C0.9-0.6c0.3-0.1%2C0.8-0.2%2C1.2-0.2%0A%09%09c0.5%2C0%2C0.9%2C0.1%2C1.2%2C0.3c0.3%2C0.2%2C0.7%2C0.4%2C0.9%2C0.8s0.5%2C0.7%2C0.6%2C1.2S15%2C94.8%2C15%2C95.4z%20M13.1%2C94.4c0-0.2%2C0-0.4-0.1-0.6%0A%09%09c-0.1-0.2-0.1-0.4-0.2-0.5c-0.1-0.1-0.2-0.2-0.4-0.3c-0.2-0.1-0.3-0.1-0.5-0.1c-0.2%2C0-0.3%2C0-0.4%2C0.1s-0.3%2C0.2-0.3%2C0.3%0A%09%09c0%2C0.1-0.2%2C0.3-0.2%2C0.4c0%2C0.1-0.1%2C0.4-0.1%2C0.6c0%2C0.2%2C0%2C0.4%2C0.1%2C0.6c0.1%2C0.2%2C0.1%2C0.3%2C0.2%2C0.4c0.1%2C0.1%2C0.2%2C0.2%2C0.4%2C0.3%0A%09%09c0.2%2C0.1%2C0.3%2C0.1%2C0.5%2C0.1c0.2%2C0%2C0.3%2C0%2C0.4-0.1s0.2-0.2%2C0.3-0.3c0.1-0.1%2C0.2-0.2%2C0.2-0.4C13%2C94.7%2C13.1%2C94.6%2C13.1%2C94.4z%22%2F%3E%0A%3C%2Fg%3E%0A%3Cg%3E%0A%09%3Cpath%20fill%3D%22%23636363%22%20d%3D%22M176%2C99.7V98.1c0.6%2C0.4%2C1.2%2C0.602%2C2%2C0.602c0.5%2C0%2C0.8-0.102%2C1.1-0.301c0.301-0.199%2C0.4-0.5%2C0.4-0.801%0A%09%09c0-0.398-0.2-0.699-0.5-0.898c-0.3-0.2-0.8-0.301-1.3-0.301h-0.802V95h0.701c1.101%2C0%2C1.601-0.4%2C1.601-1.1c0-0.7-0.4-1-1.302-1%0A%09%09c-0.6%2C0-1.1%2C0.2-1.6%2C0.5v-1.5c0.6-0.3%2C1.301-0.4%2C2.1-0.4c0.9%2C0%2C1.5%2C0.2%2C2%2C0.6s0.701%2C0.9%2C0.701%2C1.5c0%2C1.1-0.601%2C1.8-1.701%2C2.1l0%2C0%0A%09%09c0.602%2C0.1%2C1.102%2C0.3%2C1.4%2C0.6s0.5%2C0.8%2C0.5%2C1.3c0%2C0.801-0.3%2C1.4-0.9%2C1.9c-0.6%2C0.5-1.398%2C0.7-2.398%2C0.7%0A%09%09C177.2%2C100.1%2C176.5%2C100%2C176%2C99.7z%22%2F%3E%0A%3C%2Fg%3E%0A%3Cg%3E%0A%09%3Cpath%20fill%3D%22%23636363%22%20d%3D%22M98.5%2C179.102c0%2C0.398-0.1%2C0.799-0.2%2C1.199C98.2%2C180.7%2C98%2C181%2C97.7%2C181.2s-0.601%2C0.5-0.9%2C0.601%0A%09%09c-0.3%2C0.1-0.7%2C0.199-1.2%2C0.199c-0.5%2C0-0.9-0.1-1.3-0.3c-0.4-0.2-0.7-0.399-0.9-0.8c-0.2-0.4-0.5-0.7-0.6-1.2%0A%09%09c-0.1-0.5-0.2-1-0.2-1.601c0-0.699%2C0.1-1.399%2C0.3-2c0.2-0.601%2C0.4-1.101%2C0.8-1.5c0.4-0.399%2C0.7-0.699%2C1.2-1c0.5-0.3%2C1-0.3%2C1.6-0.3%0A%09%09c0.6%2C0%2C1.2%2C0.101%2C1.5%2C0.199v1.5c-0.4-0.199-0.9-0.399-1.4-0.399c-0.3%2C0-0.6%2C0.101-0.8%2C0.2c-0.2%2C0.101-0.5%2C0.3-0.7%2C0.5%0A%09%09c-0.2%2C0.199-0.3%2C0.5-0.4%2C0.8c-0.1%2C0.301-0.2%2C0.7-0.2%2C1.101l0%2C0c0.4-0.601%2C1-0.8%2C1.8-0.8c0.3%2C0%2C0.7%2C0.1%2C0.9%2C0.199%0A%09%09c0.2%2C0.101%2C0.5%2C0.301%2C0.7%2C0.5c0.199%2C0.2%2C0.398%2C0.5%2C0.5%2C0.801C98.5%2C178.2%2C98.5%2C178.7%2C98.5%2C179.102z%20M96.7%2C179.2%0A%09%09c0-0.899-0.4-1.399-1.1-1.399c-0.2%2C0-0.3%2C0-0.5%2C0.1c-0.2%2C0.101-0.3%2C0.201-0.4%2C0.301c-0.1%2C0.101-0.2%2C0.199-0.2%2C0.4%0A%09%09c0%2C0.199-0.1%2C0.299-0.1%2C0.5c0%2C0.199%2C0%2C0.398%2C0.1%2C0.6s0.1%2C0.3%2C0.2%2C0.5c0.1%2C0.199%2C0.2%2C0.199%2C0.4%2C0.3c0.2%2C0.101%2C0.3%2C0.101%2C0.5%2C0.101%0A%09%09c0.2%2C0%2C0.3%2C0%2C0.5-0.101c0.2-0.101%2C0.301-0.199%2C0.301-0.3c0-0.1%2C0.199-0.301%2C0.199-0.399C96.6%2C179.7%2C96.7%2C179.4%2C96.7%2C179.2z%22%2F%3E%0A%3C%2Fg%3E%0A%3Ccircle%20fill%3D%22%23636363%22%20cx%3D%2295%22%20cy%3D%2295%22%20r%3D%227%22%2F%3E%0A%3C%2Fsvg%3E%0A") 50% 50%/191px no-repeat;
+}