Fix 400s/empty server responses

https://github.com/ajayyy/SponsorBlock/issues/1819#issuecomment-1667166456

sponsorblock_lm.lua

@@ -1,5 +1,6 @@
 local utils = require "mp.utils"
 local opts = require "mp.options"
+local bit = require "bit"
 
 -- https://wiki.sponsor.ajay.app/w/Types#Category
 -- See README to configure options
@@ -195,8 +196,8 @@ function getSegments(video_id)
     end
 
     local url = options.api_url .. "/skipSegments/" .. hashed_id .. "?actionTypes="
-            .. "[\"skip\",\"mute\",\"full\"]&categories="
-            .. utils.format_json(split(options.categories))
+            .. percentEncodeComponent("[\"skip\",\"mute\",\"full\"]") .. "&categories="
+            .. percentEncodeComponent(utils.format_json(split(options.categories)))
     proc = mp.command_native({
         name = "subprocess",
         args = {"curl", "--silent", "--show-error",  "--globoff", url},
@@ -279,6 +280,14 @@ function getIDs()
     end
 end
 
+function percentEncodeComponent(s)
+    -- https://url.spec.whatwg.org/#component-percent-encode-set
+    return string.gsub(s, "[^!'()*-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~]", function (char)
+        local byte = string.byte(char)
+        return "%" .. bit.tohex(byte, -2)
+    end)
+end
+
 function split(s)
     local arr = {}
     for i in string.gmatch(s, "%S+") do