From f981b7a338a3282b18683dd45fd1fd5868f6abf8 Mon Sep 17 00:00:00 2001
From: zPlus <zplus@peers.community>
Date: Sat, 16 Sep 2023 07:47:59 +0200
Subject: [PATCH] Add support for OPDS.

---
 app.py                                  | 29 ++++++++++
 pages/templates/library/opds/books.tpl  | 76 ++++++++++++++++++++++++
 pages/templates/library/opds/others.tpl | 77 +++++++++++++++++++++++++
 pages/templates/library/opds/root.tpl   | 28 +++++++++
 4 files changed, 210 insertions(+)
 create mode 100644 pages/templates/library/opds/books.tpl
 create mode 100644 pages/templates/library/opds/others.tpl
 create mode 100644 pages/templates/library/opds/root.tpl

diff --git a/app.py b/app.py
index dad8177..d896fb6 100755
--- a/app.py
+++ b/app.py
@@ -87,6 +87,35 @@ def static(filename):
 
     return bottle.static_file(filename, root='./static/')
 
+@bottle.get('/library/opds.xml', name='library_opds')
+def library_opds():
+    """
+    Serve OPDS Atom RSS feeds
+    """
+
+    #response.content_type = 'text/xml; charset=utf-8'
+    return template('templates/library/opds/root.tpl')
+
+@bottle.get('/library/opds/books.xml', name='library_opds_books')
+def library_opds_books():
+    """
+    Serve OPDS Atom RSS feeds.
+    Items of type "books" only
+    """
+
+    #response.content_type = 'text/xml; charset=utf-8'
+    return template('templates/library/opds/books.tpl')
+
+@bottle.get('/library/opds/others.xml', name='library_opds_others')
+def library_opds_others():
+    """
+    Serve OPDS Atom RSS feeds.
+    Uncategorized items only
+    """
+
+    #response.content_type = 'text/xml; charset=utf-8'
+    return template('templates/library/opds/others.tpl')
+
 @bottle.get('/library/<item_id>', name='library_item')
 def library_item(item_id):
     """
diff --git a/pages/templates/library/opds/books.tpl b/pages/templates/library/opds/books.tpl
new file mode 100644
index 0000000..ca6f780
--- /dev/null
+++ b/pages/templates/library/opds/books.tpl
@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+{% set data = query("""
+    PREFIX library: <dokk:library:>
+    PREFIX license: <dokk:license:>
+
+    CONSTRUCT {
+        ?item library:title ?title;
+              library:author ?author ;
+              library:license ?license .
+        ?license license:id ?license_id ;
+                 license:name ?license_name .
+    }
+    WHERE {
+        ?item library:type 'book' ;
+              library:title ?title ;
+              library:author ?author ;
+              library:license ?license .
+
+        OPTIONAL {
+        ?license license:id ?license_id_optional ;
+                 license:name ?license_name_optional .
+        }
+
+        BIND(COALESCE(?license_id_optional, SUBSTR(STR(?license), 14)) AS ?license_id)
+        BIND(COALESCE(?license_name_optional, SUBSTR(STR(?license), 14)) AS ?license_name)
+    }
+    """,
+    {
+        '@context': {
+            'library': 'dokk:library:',
+            'license': 'dokk:license:',
+            'library:author': { '@container': '@set' },
+            'library:license': { '@container': '@set' }
+        },
+        'library:title': {}
+    })
+%}
+
+<feed xmlns="http://www.w3.org/2005/Atom"
+      xmlns:dc="http://purl.org/dc/terms/"
+      xmlns:opds="http://opds-spec.org/2010/catalog">
+
+    <link rel="start" href="/library/opds.xml" type="application/atom+xml;profile=opds-catalog;kind=navigation"/>
+    <link rel="self" href="/library/opds/books.xml" type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
+
+    <id>urn:uuid:1ad42a21-f98f-44a9-b37a-7c4496ab661d</id>
+    <title>DOKK Library Books</title>
+    <updated>{{ now() }}</updated>
+    <author>
+        <name>DOKK</name>
+        <uri>https://dokk.org</uri>
+    </author>
+
+    {% for item in data["@graph"]|sort(attribute="library:title") %}
+    <entry>
+        <title>{{ item['library:title'] }}</title>
+
+        {% for author in item["library:author"]|sort() %}
+            <author>
+                <name>{{ author }}</name>
+            </author>
+        {% endfor%}
+
+        {% for license in item["library:license"]|sort(attribute="license:id") %}
+            <rights>{{ license['license:id'] }}</rights>
+        {% endfor%}
+
+        <updated></updated>
+
+        <dc:language></dc:language>
+        <dc:identifier></dc:identifier>
+        <link rel="http://opds-spec.org/acquisition" href="https://blob.dokk.org/pdf/{{ item['@id'][8:] }}.pdf" type="application/pdf" />
+    </entry>
+    {% endfor %}
+</feed>
diff --git a/pages/templates/library/opds/others.tpl b/pages/templates/library/opds/others.tpl
new file mode 100644
index 0000000..d9429d2
--- /dev/null
+++ b/pages/templates/library/opds/others.tpl
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+{% set data = query("""
+    PREFIX library: <dokk:library:>
+    PREFIX license: <dokk:license:>
+
+    CONSTRUCT {
+        ?item library:title ?title;
+              library:author ?author ;
+              library:license ?license .
+        ?license license:id ?license_id ;
+                 license:name ?license_name .
+    }
+    WHERE {
+        ?item library:title ?title ;
+              library:author ?author ;
+              library:license ?license .
+
+        FILTER(NOT EXISTS { ?item library:type ?item_type })
+
+        OPTIONAL {
+        ?license license:id ?license_id_optional ;
+                 license:name ?license_name_optional .
+        }
+
+        BIND(COALESCE(?license_id_optional, SUBSTR(STR(?license), 14)) AS ?license_id)
+        BIND(COALESCE(?license_name_optional, SUBSTR(STR(?license), 14)) AS ?license_name)
+    }
+    """,
+    {
+        '@context': {
+            'library': 'dokk:library:',
+            'license': 'dokk:license:',
+            'library:author': { '@container': '@set' },
+            'library:license': { '@container': '@set' }
+        },
+        'library:title': {}
+    })
+%}
+
+<feed xmlns="http://www.w3.org/2005/Atom"
+      xmlns:dc="http://purl.org/dc/terms/"
+      xmlns:opds="http://opds-spec.org/2010/catalog">
+
+    <link rel="start" href="/library/opds.xml" type="application/atom+xml;profile=opds-catalog;kind=navigation"/>
+    <link rel="self" href="/library/opds/others.xml" type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
+
+    <id>urn:uuid:98d6aff1-0df9-4229-8c6e-2ab0ebece9e1</id>
+    <title>DOKK Library Other Materials</title>
+    <updated>{{ now() }}</updated>
+    <author>
+        <name>DOKK</name>
+        <uri>https://dokk.org</uri>
+    </author>
+
+    {% for item in data["@graph"]|sort(attribute="library:title") %}
+    <entry>
+        <title>{{ item['library:title'] }}</title>
+
+        {% for author in item["library:author"]|sort() %}
+            <author>
+                <name>{{ author }}</name>
+            </author>
+        {% endfor%}
+
+        {% for license in item["library:license"]|sort(attribute="license:id") %}
+            <rights>{{ license['license:id'] }}</rights>
+        {% endfor%}
+
+        <updated></updated>
+
+        <dc:language></dc:language>
+        <dc:identifier></dc:identifier>
+        <link rel="http://opds-spec.org/acquisition" href="https://blob.dokk.org/pdf/{{ item['@id'][8:] }}.pdf" type="application/pdf" />
+    </entry>
+    {% endfor %}
+</feed>
diff --git a/pages/templates/library/opds/root.tpl b/pages/templates/library/opds/root.tpl
new file mode 100644
index 0000000..e4314a4
--- /dev/null
+++ b/pages/templates/library/opds/root.tpl
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom"
+      xmlns:dc="http://purl.org/dc/terms/"
+      xmlns:opds="http://opds-spec.org/2010/catalog">
+
+    <id>urn:uuid:37a3bc53-cce9-47a2-b557-2c2d5b73d915</id>
+    <title>DOKK Library</title>
+    <updated>{{ now() }}</updated>
+    <author>
+        <name>DOKK</name>
+        <uri>https://dokk.org</uri>
+    </author>
+
+    <link rel="start" href="/library/opds.xml" type="application/atom+xml;profile=opds-catalog;kind=navigation"/>
+
+    <entry>
+        <title>Books</title>
+        <link rel="subsection" href="/library/opds/books.xml" type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
+        <updated>{{ now() }}</updated>
+        <id>urn:uuid:1ad42a21-f98f-44a9-b37a-7c4496ab661d</id>
+    </entry>
+    <entry>
+        <title>Other Materials</title>
+        <link rel="subsection" href="/library/opds/others.xml" type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
+        <updated>{{ now() }}</updated>
+        <id>urn:uuid:98d6aff1-0df9-4229-8c6e-2ab0ebece9e1</id>
+    </entry>
+</feed>