UPDATED: golang code to query GA data via the Google Core Reporting API using two-legged service account Google OAuth2 authentication

i’ve updated my example Golang code that authenticates with the Core Reporting API using service account OAuth2 (two-legged) authentication to use the newly updated golang.org/x/oauth2 library.

my previous post & full explanation of service account pre-reqs/setup:


full code:

package main
import (
// constants
const (
datelayout string = "2006-01-02" // date format that Core Reporting API requires
// globals that you DON'T need to change
var (
enddate string = time.Now().Format(datelayout) // set end query date to today
startdate string = time.Now().Add(time.Hour * 24 * 1).Format(datelayout) // set start query date to yesterday
metric string = "ga:pageviews" // GA metric that we want
tokenurl string = "https://accounts.google.com/o/oauth2/token" // (json:"token_uri") Google oauth2 Token URL
// globals that you DO need to change
// populate these with values from the JSON secretsfile obtained from the Google Cloud Console specific to your app)
// example secretsfile JSON:
// {
// "web": {
// "auth_uri": "https://accounts.google.com/o/oauth2/auth",
// "token_uri": "https://accounts.google.com/o/oauth2/token",
// "client_email": "blahblahblahblah@developer.gserviceaccount.com",
// "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/blahblahblahblah@developer.gserviceaccount.com",
// "client_id": "blahblahblahblah.apps.googleusercontent.com",
// "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs"
// }
// }
var (
gaServiceAcctEmail string = "blahblahblahblah@developer.gserviceaccount.com" // (json:"client_email") email address of registered application
gaServiceAcctPEMKey string = "./analyticsdumper.pem" // full path to private key file (PEM format) of your application from Google Cloud Console
gaTableID string = "ga:NNNNNNNN" // namespaced profile (table) ID of your analytics account/property/profile
// func: main()
// the main function.
func main() {
// load up the registered applications private key
pk, err := ioutil.ReadFile(gaServiceAcctPEMKey)
if err != nil {
log.Fatal("Error reading GA Service Account PEM key -", err)
// create a jwt.Config that we will subsequently use for our authenticated client/transport
// relevant docs for all the oauth2 & json web token stuff at https://godoc.org/golang.org/x/oauth2 & https://godoc.org/golang.org/x/oauth2/jwt
jwtc := jwt.Config{
Email: gaServiceAcctEmail,
PrivateKey: pk,
Scopes: []string{analytics.AnalyticsReadonlyScope},
TokenURL: tokenurl,
// create our authenticated http client using the jwt.Config we just created
clt := jwtc.Client(oauth2.NoContext)
// create a new analytics service by passing in the authenticated http client
as, err := analytics.New(clt)
if err != nil {
log.Fatal("Error creating Analytics Service at analytics.New() -", err)
// create a new analytics data service by passing in the analytics service we just created
// relevant docs for all the analytics stuff at https://godoc.org/google.golang.org/api/analytics/v3
ads := analytics.NewDataGaService(as)
// w00t! now we're talking to the core reporting API. the hard stuff is over, lets setup a simple query.
// setup the query, call the Analytics API via our analytics data service's Get func with the table ID, dates & metric variables
gasetup := ads.Get(gaTableID, startdate, enddate, metric)
// send the query to the API, get a big fat gaData back.
gadata, err := gasetup.Do()
if err != nil {
log.Fatal("API error at gasetup.Do() -", err)
// print out some nice things
fmt.Printf("%s pageviews for %s (%s) from %s to %s.\n", gadata.Rows[0], gadata.ProfileInfo.ProfileName, gadata.ProfileInfo.WebPropertyId, startdate, enddate)

have fun!

drop me a line or say hello on twitter if any questions.

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