Homer7 Lua script to change body of header user-agent in CANCEL method

gistfile1.txt

-- With this Lua code we will substitute body of header "User-Agent" to cisco, if there are more then one User-Agent headers, then we will fix them all.
-- Just add this to your docker compose part for heplify-server:
--    volumes:
--     - ./lua:/lua
-- put your script in ./lua directory and restart docker-container

-- this function will be executed first
function checkRAW()

        local protoType = GetHEPProtoType()

        -- Check if we have SIP type
        if protoType ~= 1 then
                return
        end

        -- original SIP message Payload
        local raw = GetRawMessage()

        -- https://www.lua.org/pil/20.html

        local method = string.sub(raw, 1, 6)

        if method == "CANCEL" then

        -- https://www.lua.org/pil/20.2.html
        -- https://www.ibm.com/docs/sr/ias?topic=manipulation-stringgsub-s-pattern-repl-n

        local ripe, count  = string.gsub(raw, "(User%-Agent:)(.-)(\n+)", "%1 cisco%3")

                if count > 0 then

                        Logp("ERROR", "ripe", ripe)
                        SetRawMessage(ripe)

                end

        end

        return

end