/
gopi.go
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/
gopi.go
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package gopi
import (
"bufio"
"context"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"os"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/blogger/v3"
"google.golang.org/api/docs/v1"
"google.golang.org/api/drive/v3"
"google.golang.org/api/gmail/v1"
"google.golang.org/api/option"
"google.golang.org/api/sheets/v4"
)
// retrive service from api
func GetService(client *http.Client, srvtype string) interface{} {
ctx := context.Background()
var srv interface{}
var err error
switch srvtype {
case "docs":
srv, err = docs.NewService(ctx, option.WithHTTPClient(client))
case "sheets":
srv, err = sheets.NewService(ctx, option.WithHTTPClient(client))
case "blogger":
srv, err = blogger.NewService(ctx, option.WithHTTPClient(client))
case "drive":
srv, err = drive.NewService(ctx, option.WithHTTPClient(client))
case "gmail":
srv, err = gmail.NewService(ctx, option.WithHTTPClient(client))
}
if err != nil {
log.Fatalf("Unable to retrieve Service client: %v", err)
}
return srv
}
// Retrieves a token, saves the token, then returns the generated client.
func GetClient(jsonsecfile string, tokFile string, apiscope ...string) *http.Client {
config := getConfig(jsonsecfile, apiscope...)
tok, err := tokenFromFile(tokFile)
if err != nil {
tok = getTokenFromWeb(config)
saveToken(tokFile, tok)
}
return config.Client(context.Background(), tok)
}
func getConfig(jsonsecfile string, apiscope ...string) *oauth2.Config {
b, err := os.ReadFile(jsonsecfile)
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
config, err := google.ConfigFromJSON(b, apiscope...)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
return config
}
// Requests a token from the web, then returns the retrieved token.
func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Go to the following link in your browser then type the "+
"authorization code: \n%v\n", authURL)
var authCode string
if _, err := fmt.Scan(&authCode); err != nil {
log.Fatalf("Unable to read authorization code: %v", err)
}
tok, err := config.Exchange(context.Background(), authCode)
if err != nil {
log.Fatalf("Unable to retrieve token from web: %v", err)
}
return tok
}
// Requests a token from the web, then returns the retrieved token.
func GenerateTokenFile(jsonsecfile string, tokFile string, apiscope ...string) {
config := getConfig(jsonsecfile, apiscope...)
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Go to the following link in your browser then type the "+
"authorization code: \n%v\n", authURL)
r, _ := io.Pipe()
scanner := bufio.NewScanner(r)
authCode := scanner.Text()
tok, err := config.Exchange(context.Background(), authCode)
if err != nil {
log.Fatalf("Unable to retrieve token from web: %v", err)
}
saveToken(tokFile, tok)
}
// Retrieves a token from a local file.
func tokenFromFile(file string) (*oauth2.Token, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
tok := &oauth2.Token{}
err = json.NewDecoder(f).Decode(tok)
return tok, err
}
// Saves a token to a file path.
func saveToken(path string, token *oauth2.Token) {
fmt.Printf("Saving credential file to: %s\n", path)
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
log.Fatalf("Unable to cache OAuth token: %v", err)
}
defer f.Close()
json.NewEncoder(f).Encode(token)
}