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service.go
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service.go
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// Package google has Google API client stuff
package google
import (
"bytes"
"compress/gzip"
"context"
"encoding/base64"
"flag"
"io"
"net/http"
"sync"
"github.com/spotlightpa/almanack/pkg/almlog"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
)
type Service struct {
certMU sync.RWMutex
cert []byte
mockClient *http.Client
viewID string
driveID string
}
func (gsvc *Service) AddFlags(fl *flag.FlagSet) {
// Using a crazy Base64+GZIP because storing JSON containing \n in
//an env var breaks a lot for some reason
fl.Func("google-json", "GZIP Base64 JSON `credentials` for Google", gsvc.ConfigureCert)
fl.StringVar(&gsvc.viewID, "ga-view-id", "", "view `ID` for Google Analytics")
fl.StringVar(&gsvc.driveID, "google-drive-id", "", "`ID` for shared Google Drive")
}
func (gsvc *Service) HasCert() bool {
gsvc.certMU.RLock()
defer gsvc.certMU.RUnlock()
return len(gsvc.cert) > 0
}
func (gsvc *Service) SetMockClient(cl *http.Client) {
gsvc.certMU.Lock()
defer gsvc.certMU.Unlock()
gsvc.mockClient = cl
}
func (gsvc *Service) ConfigureCert(s string) error {
gsvc.certMU.Lock()
defer gsvc.certMU.Unlock()
b, err := base64.StdEncoding.DecodeString(s)
if err != nil {
return err
}
g, err := gzip.NewReader(bytes.NewReader(b))
if err != nil {
return err
}
defer g.Close()
gsvc.cert, err = io.ReadAll(g)
if err != nil {
return err
}
return nil
}
func (gsvc *Service) client(ctx context.Context, scopes ...string) (cl *http.Client, err error) {
gsvc.certMU.RLock()
defer gsvc.certMU.RUnlock()
if gsvc.mockClient != nil {
return gsvc.mockClient, nil
}
if len(gsvc.cert) == 0 {
l := almlog.FromContext(ctx)
l.WarnContext(ctx, "using default Google credentials")
cl, err = google.DefaultClient(ctx, scopes...)
return
}
creds, err := google.CredentialsFromJSON(ctx, gsvc.cert, scopes...)
if err != nil {
return
}
cl = oauth2.NewClient(ctx, creds.TokenSource)
return
}