Teams refresh.xml

teams_refresh.xml
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<?xml version="1.0" encoding="utf-8"?>
<luaAutoStarters>
    <luaScript name="Automatic Token Request">
        <code><![CDATA[
-- Variables that depend on Microsofts API
local refreshUrl = "https://login.microsoftonline.com/organizations/oauth2/v2.0/token"
local content = "client_id=[Client-ID]&scope=presence.read&redirect_uri=https://login.microsoftonline.com/common/oauth2/nativeclient&grant_type=refresh_token&refresh_token="

-- Configure the timing. Tokens last for 3599 seconds so the overall refresh-time must be lower.
local refreshInterval = 20       -- check every 20 seconds if there is something new to do
local refreshCountdownMax = 150  -- once authentication was successful, wait 150 times 20 seconds until refresh
local refreshCountdown = 0       -- current live-ticker decremented once every 20 seconds, new credentials are fetched when it reaches 0

-- Analyzes the response from Microsoft to the request of (new) tokens
local function analyzeResponse(responseCode, responseBody, responseHeaders)
    if responseCode == 200 and responseBody then
        values = json.eval(responseBody)
        debug.log("Teams Automatic Token Refresh: updating tokens")
        persisted["msTeamsToken"] = values["access_token"]
        persisted["msTeamsRefresh"] = values["refresh_token"]
        refreshCountdown = refreshCountdownMax
    else
        debug.log("Teams Automatic Token Refresh: failed to receive tokens", "e")
        refreshCountdown = 0
    end
    shared["msTeamsReAuthNeeded"] = "false"
end

local function refreshLoop()
    if persisted["msTeamsToken"] and persisted["msTeamsRefresh"] then
        refreshCountdown = refreshCountdown - 1
        if shared["msTeamsReAuthNeeded"] and shared["msTeamsReAuthNeeded"] == "true" then
            debug.log("Teams Automatic Token Refresh: other scripts failed to authenticate -> trigger refresh at "..tostring(refreshCountdown), "e")
            refreshCountdown = 0
        end
        if refreshCountdown <= 0 then
            debug.log("Teams Automatic Token Refresh: inquire token update", "d")
            http.post(refreshUrl, analyzeResponse, content..persisted["msTeamsRefresh"])
        end
    else
        debug.log("Teams Automatic Token Refresh: not yet valid", "i")
        refreshCountdown = 0
    end
    time.callbackIn(refreshLoop, refreshInterval)
end

-- start refreshing tokens
refreshLoop()
]]></code>
    </luaScript>
    <luaScript name="Get User-Code">
        <code><![CDATA[
-- Variables that depend on Microsofts API
local tokenRequestUrl = "https://login.microsoftonline.com/organizations/oauth2/v2.0/token"
local tokenRequestContent ="client_id=[Client-ID]&scope=presence.read&redirect_uri=https://login.microsoftonline.com/common/oauth2/nativeclient&grant_type=authorization_code&code="

-- Analyze the response from Microsoft to the request of tokens
local function analyzeTokenResponse(responseCode, responseBody, responseHeaders)
    if responseBody then
        debug.log("Teams Get User-Code got response: "..responseBody)
    end
    if responseCode == 200 and responseBody then
        values = json.eval(responseBody)
        debug.log("Teams Get User-Code storing access_token: "..values["access_token"])
        debug.log("Teams Get User-Code storing refresh_token: "..values["refresh_token"])
        persisted["msTeamsToken"] = values["access_token"]
        persisted["msTeamsRefresh"] = values["refresh_token"]
    end
end

-- Get a code out of the query parameters of the given URL and calls Microsofts servers to receive the tokens with the code
local function analyzeRequest(requestUrl, requestBody, requestHeader, requestVariables)
    x1, x2 = string.find(requestVariables["query_string"], "code=")
    y1, y2 = string.find(requestVariables["query_string"], "&session_state")
    debug.log("Teams Get User-Code got request to start: "..x1.." - "..x2.." - "..y1.." - "..y2)
    if x1 and y2 then
        code = string.sub(requestVariables["query_string"], x2+1, y1-1)
        http.post(tokenRequestUrl,analyzeTokenResponse,tokenRequestContent..code)
    end
end

-- Listen to the address <Phone-IP>/api/v1/exec/getTeamsCode and gives the request to "analyzeRequest"
http.listen("getTeamsCode", analyzeRequest, true)]]></code>
    </luaScript>
</luaAutoStarters>