/
gmail.go
161 lines (148 loc) · 4.39 KB
/
gmail.go
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package utils
import (
"../models"
"encoding/json"
"fmt"
"golang.org/x/net/context"
"google.golang.org/api/gmail/v1"
"log"
"net/http"
"net/url"
"os"
"os/user"
"path/filepath"
"strings"
"time"
"golang.org/x/oauth2"
)
// ProcessMessages - process unread messages
func ProcessMessages(
mResponseMessages []*gmail.Message,
gmailClient *gmail.Service,
queue []models.Message,
processedQueue map[string]bool,
pushToQueue bool,
lastProcessedTimestamp int64) ([]models.Message, map[string]bool, bool, int64) {
var messagesChannel = make(chan *gmail.Message)
var processedMessagesCount = 0
var totalMessagesCount = 0
var noNewMessages = false
for _, m := range mResponseMessages {
go func(messageId string) {
if message, err := gmailClient.Users.Messages.Get(User, messageId).Do(); err == nil {
if message.InternalDate > lastProcessedTimestamp {
fmt.Println("Message fetched")
totalMessagesCount++
messagesChannel <- message
noNewMessages = false
} else {
noNewMessages = true
}
} else {
fmt.Printf("There was an error trying to get message - %s\n", err.Error())
}
}(m.Id)
}
for {
select {
case message := <-messagesChannel:
processedMessagesCount++
fmt.Printf("Inside\n")
var messageItem = models.Message{}
messageItem.ID = message.Id
if ok := processedQueue[messageItem.ID]; ok != true {
fmt.Printf("Processing headers\n")
for _, header := range message.Payload.Headers {
if header.Name == "From" {
messageItem.From = header.Value
} else if header.Name == "Subject" {
messageItem.Subject = header.Value
}
}
fmt.Printf("Processing queuee\n")
messageItem.Link = strings.Replace(BaseGmailMessageURL, "%MESSAGE_ID%", message.Id, -1)
if pushToQueue == true {
queue = append(queue, messageItem)
} else {
NotifyMessage(messageItem)
processedQueue[messageItem.ID] = true
pushToQueue = true
}
}
if totalMessagesCount == processedMessagesCount {
fmt.Printf("Last processed message timestamp %#v \n", message.InternalDate)
return queue, processedQueue, pushToQueue, message.InternalDate
}
case <-time.After(50 * time.Millisecond):
if noNewMessages == true {
return queue, processedQueue, pushToQueue, lastProcessedTimestamp
}
fmt.Printf(".")
}
}
}
// 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)
}