From 051da8832817e8bbfb26cb1c028076ce6aeed043 Mon Sep 17 00:00:00 2001
From: mrwormo <mrwormo@ox2.fr>
Date: Sun, 7 Feb 2021 22:10:20 +0100
Subject: [PATCH] Add Library of Congress engine

---
 searx/engines/loc.py | 68 ++++++++++++++++++++++++++++++++++++++++++++
 searx/settings.yml   |  5 ++++
 2 files changed, 73 insertions(+)
 create mode 100644 searx/engines/loc.py

diff --git a/searx/engines/loc.py b/searx/engines/loc.py
new file mode 100644
index 000000000..5c09ceff2
--- /dev/null
+++ b/searx/engines/loc.py
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+
+ Library of Congress : images from Prints and Photographs Online Catalog
+
+"""
+
+from json import loads
+from urllib.parse import urlencode
+
+
+about = {
+    "website": 'https://www.loc.gov/pictures/',
+    "wikidata_id": 'Q131454',
+    "official_api_documentation": 'https://www.loc.gov/pictures/api',
+    "use_official_api": True,
+    "require_api_key": False,
+    "results": 'JSON',
+}
+
+categories = ['images']
+
+paging = True
+
+base_url = 'https://loc.gov/pictures/search/?'
+search_string = "&sp={page}&{query}&fo=json"
+
+IMG_SRC_FIXES = {
+    'https://tile.loc.gov/storage-services/': 'https://tile.loc.gov/storage-services/',
+    'https://loc.gov/pictures/static/images/': 'https://tile.loc.gov/storage-services/',
+    'https://www.loc.gov/pictures/cdn/': 'https://tile.loc.gov/storage-services/',
+}
+
+
+def request(query, params):
+
+    search_path = search_string.format(
+        query=urlencode({'q': query}),
+        page=params['pageno'])
+
+    params['url'] = base_url + search_path
+
+    return params
+
+
+def response(resp):
+    results = []
+
+    json_data = loads(resp.text)
+
+    for result in json_data['results']:
+        img_src = result['image']['full']
+        for url_prefix, url_replace in IMG_SRC_FIXES.items():
+            if img_src.startswith(url_prefix):
+                img_src = img_src.replace(url_prefix, url_replace)
+                break
+        else:
+            img_src = result['image']['thumb']
+        results.append({
+            'url': result['links']['item'],
+            'title': result['title'],
+            'img_src': img_src,
+            'thumbnail_src': result['image']['thumb'],
+            'author': result['creator'],
+            'template': 'images.html'
+        })
+
+    return results
diff --git a/searx/settings.yml b/searx/settings.yml
index 785e7a642..7ff36efd3 100644
--- a/searx/settings.yml
+++ b/searx/settings.yml
@@ -698,6 +698,11 @@ engines:
       require_api_key: false
       results: HTML
 
+  - name : library of congress
+    engine : loc
+    shortcut : loc
+    categories : images
+
   - name : lobste.rs
     engine : xpath
     search_url : https://lobste.rs/search?utf8=%E2%9C%93&q={query}&what=stories&order=relevance