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fix: allow links to resources embedded in content documents
This commit checks that the linked resource is not in the spine before reporting `OPF-067` ("The resource "…" must not be listed both as a "link" element in the package metadata and as a manifest item."). Effectively, this allows package links to publication resources in the two cases identified in the EPUB 3.3 specification: > Resources referenced from the link element are publication resources > only when they are: > - referenced from the spine; or > - included or embedded in an EPUB content document Fix #1454
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9 files changed

+72
-6
lines changed

9 files changed

+72
-6
lines changed

‎src/main/java/com/adobe/epubcheck/opf/OPFChecker30.java

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -412,10 +412,10 @@ private void checkLinkedResources()
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LinkedResources links = ((OPFHandler30) opfHandler).getLinkedResources();
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for (LinkedResource link : links.asList())
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{
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if (opfHandler.getItemByURL(link.getDocumentURL()).isPresent())
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Optional<OPFItem> item = opfHandler.getItemByURL(link.getDocumentURL());
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if (item.isPresent() && !item.get().isInSpine())
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{
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// FIXME 2022 check how to report the URL
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report.message(MessageId.OPF_067, EPUBLocation.of(context), link.getDocumentURL().path());
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report.message(MessageId.OPF_067, EPUBLocation.of(context), item.get().getPath());
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}
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}
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}

‎src/main/resources/com/adobe/epubcheck/messages/MessageBundle.properties

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@@ -214,7 +214,7 @@ OPF_095=The "media-type" attribute of "voicing" links must be an audio MIME type
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OPF_096=Non-linear content must be reachable, but found no hyperlink to "%1$s".
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OPF_096b=No hyperlink was found to non-linear document "%1$s", please check that it can be reached from scripted content.
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OPF_097=Resource "%1$s" is listed in the manifest, but no reference to it was found in content documents.
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OPF_098=The "href" attribute must not reference resources via elements in the package document itself, but found URL "%1$s".
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OPF_098=The "href" attribute must reference resources, not elements in the package document, but found URL "%1$s".
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#Package
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PKG_001=Validating the EPUB against version %1$s but detected version %2$s.

‎src/test/resources/epub3/05-package-document/files/link-to-embedded-resource-valid/EPUB/content_001.xhtml

Lines changed: 18 additions & 0 deletions
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@@ -0,0 +1,18 @@
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<!DOCTYPE html>
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<html xmlns:epub="http://www.idpf.org/2007/ops" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
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lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Minimal EPUB</title>
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<script id="meta-json" type="application/ld+json">
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{
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"@context" : "http://schema.org",
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"name" : "test"
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}
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</script>
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</head>
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<body>
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<h1>Loomings</h1>
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<p>Call me Ishmael.</p>
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</body>
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</html>

‎src/test/resources/epub3/05-package-document/files/link-to-embedded-resource-valid/EPUB/nav.xhtml

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@@ -0,0 +1,14 @@
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" xml:lang="en" lang="en">
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<head>
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<meta charset="utf-8"/>
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<title>Minimal Nav</title>
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</head>
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<body>
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<nav epub:type="toc">
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<ol>
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<li><a href="content_001.xhtml">content 001</a></li>
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</ol>
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</nav>
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</body>
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</html>

‎src/test/resources/epub3/05-package-document/files/link-to-embedded-resource-valid/EPUB/package.opf

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@@ -0,0 +1,18 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<package xmlns="http://www.idpf.org/2007/opf" version="3.0" xml:lang="en" unique-identifier="q">
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<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
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<dc:title id="title">Minimal EPUB 3.0</dc:title>
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<dc:language>en</dc:language>
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<dc:identifier id="q">NOID</dc:identifier>
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<meta property="dcterms:modified">2017-06-14T00:00:01Z</meta>
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<link rel="record" href="content_001.xhtml#meta-json" media-type="application/xhtml+xml" hreflang="en"
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/>
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</metadata>
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<manifest>
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<item id="content_001" href="content_001.xhtml" media-type="application/xhtml+xml"/>
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<item id="nav" href="nav.xhtml" media-type="application/xhtml+xml" properties="nav"/>
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</manifest>
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<spine>
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<itemref idref="content_001"/>
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</spine>
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</package>

‎src/test/resources/epub3/05-package-document/files/link-to-embedded-resource-valid/META-INF/container.xml

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@@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="UTF-8" ?>
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<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
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<rootfiles>
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<rootfile full-path="EPUB/package.opf" media-type="application/oebps-package+xml"/>
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</rootfiles>
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</container>

‎src/test/resources/epub3/05-package-document/files/link-to-embedded-resource-valid/mimetype

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@@ -0,0 +1 @@
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application/epub+zip

‎src/test/resources/epub3/05-package-document/files/link-to-publication-resource-error.opf renamed to ‎src/test/resources/epub3/05-package-document/files/link-to-spine-item-valid.opf

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,8 +7,7 @@
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<dc:language>en</dc:language>
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<dc:identifier id="uid">NOID</dc:identifier>
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<meta property="dcterms:modified">2019-01-01T12:00:00Z</meta>
10-
<!--Linked resources MUST NOT be listed in the manifest.-->
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<link rel="example:property" href="contents.xhtml#ch1" media-type="application/xhtml+xml"/>
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<link rel="example:property" href="contents.xhtml" media-type="application/xhtml+xml"/>
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</metadata>
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<manifest>
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<item id="t001" href="contents.xhtml" properties="nav" media-type="application/xhtml+xml"/>

‎src/test/resources/epub3/05-package-document/package-document.feature

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Original file line numberDiff line numberDiff line change
@@ -382,6 +382,16 @@ Feature: EPUB 3 — Package document
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When checking file 'link-hreflang-not-well-formed-error.opf'
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Then error OPF-092 is reported
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And no other errors or warnings are reported
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@spec @xref:sec-link-elem
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Scenario: Allow a link to a resource referenced from the spine
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When checking file 'link-to-spine-item-valid.opf'
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Then no errors or warnings are reported
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@spec @xref:sec-link-elem
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Scenario: Allow a link to a resource embedded in a content document
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When checking EPUB 'link-to-embedded-resource-valid'
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Then no errors or warnings are reported
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### 5.6 Manifest section

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