add link integrity

Author: tib

Sources/SwiftHtml/Tags/Link.swift

@@ -112,15 +112,10 @@ public extension Link {
         attribute("referrerpolicy", value.rawValue)
     }
 
-    /// Specifies the relationship between the current document and the linked document
-//    func rel(_ value: String) -> Self {
-//        attribute("rel", value)
-//    }
-
-    /// Specifies the relationship between the current document and the linked document
-//    func rel(_ value: Rel) -> Self {
-//        rel(value.rawValue)
-//    }
+    /// Allows a browser to check the fetched link to ensure that the code is never loaded if the source has been manipulated
+    func integrity(_ value: String) -> Self {
+        attribute("integrity", value)
+    }
 
     /// Specifies the size of the linked resource. Only for `rel="icon"`
     func sizes(_ value: String) -> Self {

Tests/SwiftHtmlTests/Tags/LinkTagTests.swift

@@ -26,5 +26,17 @@ final class LinkTagTests: XCTestCase {
         XCTAssertEqual(#"<link rel="apple-touch-startup-image" media="screen and (device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/img/apple/splash/1136x640.png">"#, html)
     }
 
+    func testIntegrity() {
+        let doc = Document {
+            Link(rel: .stylesheet)
+                .href("https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css")
+                .integrity("sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm")
+                .crossorigin(.anonymous)
+            
+        }
+        let html = DocumentRenderer(minify: true).render(doc)
+        XCTAssertEqual(#"<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">"#, html)
+    }
+    
 
 }

Tests/SwiftHtmlTests/Tags/ScriptTagTests.swift

@@ -23,4 +23,16 @@ final class ScriptTagTests: XCTestCase {
                             """#)
     }
 
+    func testIntegrity() {
+        let doc = Document {
+            Script()
+                .src("https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js")
+                .integrity("sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl")
+                .crossorigin(.anonymous)
+            
+        }
+        let html = DocumentRenderer(minify: true).render(doc)
+        XCTAssertEqual(#"<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>"#, html)
+    }
+    
 }