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main.go
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main.go
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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"strconv"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/gmail/v1"
"google.golang.org/api/option"
)
var totalMessagesRead int
// Retrieve a token, saves the token, then returns the generated client.
func getClient(config *oauth2.Config) *http.Client {
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
tokFile := "token.json"
tok, err := tokenFromFile(tokFile)
if err != nil {
tok = getTokenFromWeb(config)
saveToken(tokFile, tok)
}
return config.Client(context.Background(), tok)
}
// Request 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.TODO(), authCode)
if err != nil {
log.Fatalf("Unable to retrieve token from web: %v", err)
}
return 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)
}
func main() {
ctx := context.Background()
b, err := os.ReadFile("credentials.json")
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
// If modifying these scopes, delete your previously saved token.json.
config, err := google.ConfigFromJSON(b, gmail.GmailReadonlyScope, gmail.GmailModifyScope)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
client := getClient(config)
srv, err := gmail.NewService(ctx, option.WithHTTPClient(client))
if err != nil {
log.Fatalf("Unable to retrieve Gmail client: %v", err)
}
user := "me"
var listOfMessageIDs []string
for {
r, err := srv.Users.Messages.List(user).MaxResults(500).LabelIds("UNREAD").Do() //Users.Labels.List(user).Do()
if err != nil {
log.Fatalf("Unable to retrieve labels: %v", err)
}
messages := r.Messages
if len(messages) == 0 {
break
}
listOfMessageIDs = []string{}
// fmt.Println(listOfMessageIDs)
for _, msg := range messages {
// srv.Users.Messages.Modify(user, msg.Id, &gmail.ModifyMessageRequest{})
// if msg.Payload.Headers
listOfMessageIDs = append(listOfMessageIDs, msg.Id)
}
// fmt.Println(listOfMessageIDs)
err = srv.Users.Messages.BatchModify(user, &gmail.BatchModifyMessagesRequest{
RemoveLabelIds: []string{"UNREAD"},
Ids: listOfMessageIDs,
}).Do()
if err != nil {
log.Fatalf("Unable to retrieve Gmail client: %v", err)
}
totalMessagesRead += len(messages)
fmt.Println("Read " + strconv.Itoa(len(messages)) + " messages\nTotal messages read: " + strconv.Itoa(totalMessagesRead) + "\n")
}
}