[mod] Revision of the favicon solution

All favicons implementations have been documented and moved to the Python
package:

    searx.favicons

There is a configuration (based on Pydantic) for the favicons and all its
components:

    searx.favicons.config

A solution for caching favicons has been implemented:

    searx.favicon.cache

If the favicon is already in the cache, the returned URL is a data URL [1]
(something like `data:image/png;base64,...`).  By generating a data url from
the FaviconCache, additional HTTP roundtripps via the favicon_proxy are saved:

    favicons.proxy.favicon_url

The favicon proxy service now sets a HTTP header "Cache-Control: max-age=...":

    favicons.proxy.favicon_proxy

The resolvers now also provide the mime type (data, mime):

    searx.favicon.resolvers

[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

1 files changed, 25 insertions, 0 deletions

diff --git a/searx/favicons/favicons.toml b/searx/favicons/favicons.toml
new file mode 100644
index 000000000..0e433d3aa
--- /dev/null
+++ b/searx/favicons/favicons.toml
@@ -0,0 +1,25 @@
+[favicons]
+
+cfg_schema = 1   # config's schema version no.
+
+[favicons.proxy]
+
+# max_age = 5184000             # 60 days / default: 7 days (604800 sec)
+
+# [favicons.proxy.resolver_map]
+#
+# The available favicon resolvers are registered here.
+#
+# "duckduckgo" = "searx.favicons.resolvers.duckduckgo"
+# "allesedv" = "searx.favicons.resolvers.allesedv"
+# "google" = "searx.favicons.resolvers.google"
+# "yandex" = "searx.favicons.resolvers.yandex"
+
+[favicons.cache]
+
+# db_url = "/var/cache/searxng/faviconcache.db"  # default: "/tmp/faviconcache.db"
+# HOLD_TIME = 5184000                            # 60 days / default: 30 days
+# LIMIT_TOTAL_BYTES = 2147483648                 # 2 GB / default: 50 MB
+# BLOB_MAX_BYTES = 40960                         # 40 KB / default 20 KB
+# MAINTENANCE_MODE = "off"                       # default: "auto"
+# MAINTENANCE_PERIOD = 600                       # 10min / default: 1h
\ No newline at end of file