From 104b1ae096de133412838e9af09f13296fe0e59b Mon Sep 17 00:00:00 2001
From: amercader <amercadero@gmail.com>
Date: Wed, 8 Jan 2025 15:38:02 +0100
Subject: [PATCH] Add croissant endpoint at /dataset/<id>/croissant.jsonld

---
 ckanext/dcat/blueprints.py       | 41 +++++++++++++++++++++++++++++---
 ckanext/dcat/plugins/__init__.py |  6 +++++
 2 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/ckanext/dcat/blueprints.py b/ckanext/dcat/blueprints.py
index 4a12a3d3..957c9fae 100644
--- a/ckanext/dcat/blueprints.py
+++ b/ckanext/dcat/blueprints.py
@@ -1,13 +1,16 @@
 # -*- coding: utf-8 -*-
-from flask import Blueprint, jsonify
+from flask import Blueprint, jsonify, make_response
 
-from ckantoolkit import config
+import ckantoolkit as toolkit
 
 from ckan.views.dataset import CreateView
 
 import ckan.plugins.toolkit as toolkit
 import ckanext.dcat.utils as utils
-from ckanext.dcat.helpers import endpoints_enabled
+from ckanext.dcat.helpers import endpoints_enabled, croissant as croissant_serialization
+
+config = toolkit.config
+
 
 dcat = Blueprint(
     'dcat',
@@ -50,3 +53,35 @@ def dcat_json():
 dcat_json_interface.add_url_rule(config.get('ckanext.dcat.json_endpoint',
                                             '/dcat.json'),
                                  view_func=dcat_json)
+
+
+croissant = Blueprint('croissant', __name__)
+
+
+def read_dataset_croissant(_id):
+
+    try:
+        user_name = (
+            toolkit.current_user.name
+            if hasattr(toolkit, "current_user")
+            else toolkit.g.user
+        )
+
+        context = {
+            'user': user_name,
+        }
+        data_dict = {'id': _id}
+
+        dataset_dict = toolkit.get_action("package_show")(context, data_dict)
+    except (toolkit.ObjectNotFound, toolkit.NotAuthorized):
+        return toolkit.abort(
+            404,
+            toolkit._("Dataset not found or you have no permission to view it")
+        )
+
+    response = make_response(croissant_serialization(dataset_dict))
+    response.headers["Content-type"] = "application/ld+json"
+
+    return response
+
+croissant.add_url_rule('/dataset/<_id>/croissant.jsonld', view_func=read_dataset_croissant)
diff --git a/ckanext/dcat/plugins/__init__.py b/ckanext/dcat/plugins/__init__.py
index ad0b9fc5..c3944e47 100644
--- a/ckanext/dcat/plugins/__init__.py
+++ b/ckanext/dcat/plugins/__init__.py
@@ -264,6 +264,7 @@ class CroissantPlugin(p.SingletonPlugin):
 
     p.implements(p.IConfigurer, inherit=True)
     p.implements(p.ITemplateHelpers, inherit=True)
+    p.implements(p.IBlueprint)
 
     # IConfigurer
 
@@ -276,3 +277,8 @@ def get_helpers(self):
         return {
             'croissant': helpers.croissant,
         }
+
+    # IBlueprint
+
+    def get_blueprint(self):
+        return [blueprints.croissant]