Last Chapter:  Creating a REST client to get Tracks from Spotify REST API - Part1 Check out token

Git link: https://github.com/ecelg/InterSystems-IRIS-as-a-Spotify-REST-client

Ok... Now we can check out a token but it will be expired in 3600 seconds.

There are 2 questions come up🤔

1. How to save this token????🙄

2. How to refresh this token????🤨🤔 

Lets come back to the API document https://developer.spotify.com/documentation/web-api/tutorials/getting-started

Base on my understanding, this piece of API do not have a token called refresh_token, as a result, we can assume the logic like following

OK let start writing the class method getToken

Open the class rest.utli.requestUtli.cls

Add the following class method 

ClassMethod getToken(apiname As %String = "") As %String [ Language = objectscript ]
{
	//w ##class(rest.utli.requestUtli).getToken("Spotify")
	set token="0"
	set rowid=##class(rest.class.apiinfo).checkRowid(apiname)
	if (rowid'=0)
	{
		kill a
		set a=##class(rest.class.apiinfo).%OpenId(rowid)
		set token=a.accesstoken
		
		// check expirey
		set tokenexpired=0
		set refreashbefore=a.refreshbefore
		if (token="")||(refreashbefore="")
		{
			set tokenexpired=1
		}else
		{
			set rfdate=+$p(refreashbefore,",",1)
			set rftime=+$p(refreashbefore,",",2)
			if (rftime<+$p($h,",",2)) 
			{
				if (rfdate<=+$p($h,",",1)) set tokenexpired=1
			}else
			{
				if (rfdate<+$p($h,",",1)) set tokenexpired=1
			}			
			 
		}
		
		// checkout token
		if (token="")||(tokenexpired=1)
		{
			set b={}.%FromJSON(##class(rest.utli.requestUtli).checkoutToken("Spotify"))
			//w b."access_token",",",b."token_type",",",b."expires_in",!
			//set the update before
			set rbdate=$p($h,",",1)
			set rbtime=+$p($h,",",2)+b."expires_in"
			if (rbtime>86400)
			{
				set rbdate=+rbdate+1
				set rbtime=+rbtime-86400
			}
			//w rbdate_","_rbtime,!
			set a.accesstoken=b."access_token"
			set a.tokentype=b."token_type"
			set a.expiresin=b."expires_in"
			set a.refreshbefore=rbdate_","_rbtime
			set a.updateat=$h
			set std=a.%Save()
			
			return a.accesstoken
		}
	}
	return token
}

Save it

Now open a terminal and test the code

Run the following line

w ##class(rest.utli.requestUtli).getToken("Spotify")

Yeah!!! 😆It is working!!!!