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:
http://code.rickt.org/post/142452087425/how-to-download-google-analytics-data-with-golangfull code:
| package main | |
| import ( | |
| "fmt" | |
| "golang.org/x/oauth2" | |
| "golang.org/x/oauth2/jwt" | |
| "google.golang.org/api/analytics/v3" | |
| "io/ioutil" | |
| "log" | |
| "time" | |
| ) | |
| // 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 ( | |
| // CHANGE THESE!!! | |
| 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) | |
| return | |
| } |
have fun!
drop me a line or say hello on twitter if any questions.
