Created
June 6, 2016 20:39
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gmail.go
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package main | |
import ( | |
"encoding/json" | |
"fmt" | |
"io/ioutil" | |
"log" | |
"net/http" | |
"net/url" | |
"os" | |
"os/user" | |
"path/filepath" | |
"golang.org/x/net/context" | |
"golang.org/x/oauth2" | |
"golang.org/x/oauth2/google" | |
gmail "google.golang.org/api/gmail/v1" | |
) | |
// getClient uses a Context and Config to retrieve a Token | |
// then generate a Client. It returns the generated Client. | |
func getClient(ctx context.Context, config *oauth2.Config) *http.Client { | |
cacheFile, err := tokenCacheFile() | |
if err != nil { | |
log.Fatalf("Unable to get path to cached credential file. %v", err) | |
} | |
tok, err := tokenFromFile(cacheFile) | |
if err != nil { | |
tok = getTokenFromWeb(config) | |
saveToken(cacheFile, tok) | |
} | |
return config.Client(ctx, tok) | |
} | |
// getTokenFromWeb uses Config to request a Token. | |
// It 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 code string | |
if _, err := fmt.Scan(&code); err != nil { | |
log.Fatalf("Unable to read authorization code %v", err) | |
} | |
tok, err := config.Exchange(oauth2.NoContext, code) | |
if err != nil { | |
log.Fatalf("Unable to retrieve token from web %v", err) | |
} | |
return tok | |
} | |
// tokenCacheFile generates credential file path/filename. | |
// It returns the generated credential path/filename. | |
func tokenCacheFile() (string, error) { | |
usr, err := user.Current() | |
if err != nil { | |
return "", err | |
} | |
tokenCacheDir := filepath.Join(usr.HomeDir, ".credentials") | |
os.MkdirAll(tokenCacheDir, 0700) | |
return filepath.Join(tokenCacheDir, | |
url.QueryEscape("gmail-go-quickstart.json")), err | |
} | |
// tokenFromFile retrieves a Token from a given file path. | |
// It returns the retrieved Token and any read error encountered. | |
func tokenFromFile(file string) (*oauth2.Token, error) { | |
f, err := os.Open(file) | |
if err != nil { | |
return nil, err | |
} | |
t := &oauth2.Token{} | |
err = json.NewDecoder(f).Decode(t) | |
defer f.Close() | |
return t, err | |
} | |
// saveToken uses a file path to create a file and store the | |
// token in it. | |
func saveToken(file string, token *oauth2.Token) { | |
fmt.Printf("Saving credential file to: %s\n", file) | |
f, err := os.Create(file) | |
if err != nil { | |
log.Fatalf("Unable to cache oauth token: %v", err) | |
} | |
defer f.Close() | |
json.NewEncoder(f).Encode(token) | |
} | |
func gmailMain() { | |
ctx := context.Background() | |
b, err := ioutil.ReadFile("client_id.json") | |
if err != nil { | |
log.Fatalf("Unable to read client secret file: %v", err) | |
} | |
// If modifying these scopes, delete your previously saved credentials | |
// at ~/.credentials/gmail-go-quickstart.json | |
config, err := google.ConfigFromJSON(b, gmail.GmailReadonlyScope) | |
if err != nil { | |
log.Fatalf("Unable to parse client secret file to config: %v", err) | |
} | |
client := getClient(ctx, config) | |
srv, err := gmail.New(client) | |
if err != nil { | |
log.Fatalf("Unable to retrieve gmail Client %v", err) | |
} | |
user := "me" | |
// r, err := srv.Users.Labels.Get(user, "INBOX").Do() | |
r, err := srv.Users.Threads.List(user).LabelIds("INBOX").Do() | |
if err != nil { | |
log.Fatalf("Unable to retrieve labels. %v", err) | |
} | |
data, _ := r.MarshalJSON() | |
fmt.Printf("- %s\n", string(data)) | |
} |
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