[enh] add invidious engine. (#1657)

closes #1372

searx/engines/invidious.py

+# Invidious (Videos)
+#
+# @website     https://invidio.us/
+# @provide-api yes (https://github.com/omarroth/invidious/wiki/API)
+#
+# @using-api   yes
+# @results     JSON
+# @stable      yes
+# @parse       url, title, content, publishedDate, thumbnail, embedded
+
+from searx.url_utils import quote_plus
+from dateutil import parser
+import time
+
+# engine dependent config
+categories = ["videos", "music"]
+paging = True
+language_support = True
+time_range_support = True
+
+# search-url
+base_url = "https://invidio.us/"
+
+
+# do search-request
+def request(query, params):
+    time_range_dict = {
+        "day": "today",
+        "week": "week",
+        "month": "month",
+        "year": "year",
+    }
+    search_url = base_url + "api/v1/search?q={query}"
+    params["url"] = search_url.format(
+        query=quote_plus(query)
+    ) + "&page={pageno}".format(pageno=params["pageno"])
+
+    if params["time_range"] in time_range_dict:
+        params["url"] += "&date={timerange}".format(
+            timerange=time_range_dict[params["time_range"]]
+        )
+
+    if params["language"] != "all":
+        lang = params["language"].split("-")
+        if len(lang) == 2:
+            params["url"] += "&range={lrange}".format(lrange=lang[1])
+
+    return params
+
+
+# get response from search-request
+def response(resp):
+    results = []
+
+    search_results = resp.json()
+    embedded_url = (
+        '<iframe width="540" height="304" '
+        + 'data-src="'
+        + base_url
+        + 'embed/{videoid}" '
+        + 'frameborder="0" allowfullscreen></iframe>'
+    )
+
+    base_invidious_url = base_url + "watch?v="
+
+    for result in search_results:
+        rtype = result.get("type", None)
+        if rtype == "video":
+            videoid = result.get("videoId", None)
+            if not videoid:
+                continue
+
+            url = base_invidious_url + videoid
+            embedded = embedded_url.format(videoid=videoid)
+            thumbs = result.get("videoThumbnails", [])
+            thumb = next(
+                (th for th in thumbs if th["quality"] == "sddefault"), None
+            )
+            if thumb:
+                thumbnail = thumb.get("url", "")
+            else:
+                thumbnail = ""
+
+            publishedDate = parser.parse(
+                time.ctime(result.get("published", 0))
+            )
+
+            results.append(
+                {
+                    "url": url,
+                    "title": result.get("title", ""),
+                    "content": result.get("description", ""),
+                    "template": "videos.html",
+                    "publishedDate": publishedDate,
+                    "embedded": embedded,
+                    "thumbnail": thumbnail,
+                }
+            )
+
+    return results

searx/settings.yml

@@ -392,6 +392,12 @@ engines:
     timeout : 6.0
     disabled : True
 
+  - name : invidious
+    engine : invidious
+    base_url : 'https://invidio.us/'
+    shortcut: iv
+    timeout : 5.0
+
   - name: kickass
     engine : kickass
     shortcut : kc