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uscis.go
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uscis.go
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package main
import (
"flag"
"fmt"
"github.com/PuerkitoBio/goquery"
"io/ioutil"
"log"
"net/http"
"net/smtp"
"strconv"
"strings"
"time"
)
var username string
var password string
func main() {
statusMap := make(map[string]string)
start(statusMap)
ticker := time.NewTicker(60 * time.Minute)
for range ticker.C {
//fmt.Println("Tick at", t)
start(statusMap)
}
}
func start(statusMap map[string]string) {
var center = []string{"wac", "eac"}
var uniqueStatuses []string
var statuses []string
var cc int
var start int64
var limit int
flag.IntVar(&cc, "center", 0, "wac = 0 & eac = 1; default:0")
flag.Int64Var(&start, "start", 1919054100, "start of the series; default:1919054100")
flag.IntVar(&limit, "limit", 100, "no. of cases; default:100")
flag.StringVar(&username, "email", "", "gmail address for sending and receiving status")
flag.StringVar(&password, "pass", "", "gmail password for sending and receiving status")
flag.Parse()
for i := 0; i < limit; i++ {
var caseId = center[cc] + strconv.FormatInt(start+int64(i), 10)
var statusData = callApi(caseId)
var parsedData = parseHtml(statusData)
if len(parsedData) > 0 {
statuses = append(statuses, parsedData)
if !contains(uniqueStatuses, parsedData) {
uniqueStatuses = append(uniqueStatuses, parsedData)
}
var oldStatus = statusMap[caseId]
if oldStatus != "" && oldStatus != parsedData {
var statusString = fmt.Sprintf("Change in status for %s - %s -----> %s\n", caseId, statusMap[caseId], parsedData)
fmt.Printf(statusString)
sendEmail(statusString, "Change status")
}
statusMap[caseId] = parsedData
}
//fmt.Printf("%s - %s\n", caseId, parsedData)
if i == limit-1 {
var summary = ""
var s = time.Now().String()
summary = summary + "-----------SUMMARY at " + s + "---------\n"
for _, v := range uniqueStatuses {
summary = summary + fmt.Sprintf("%s - %d\n", v, occurrence(statuses, v))
}
summary = summary + "--------map size : " + strconv.Itoa(len(statusMap)) + "---------\n"
summary = summary + "-----------SUMMARY---------\n"
fmt.Println(summary)
sendEmail(summary, "Summary - "+s)
statuses = []string{}
}
}
}
func callApi(x string) string {
r, err := http.Post("https://egov.uscis.gov/casestatus/mycasestatus.do?appReceiptNum="+x, "", nil)
if err != nil {
panic(err)
}
data, _ := ioutil.ReadAll(r.Body)
return string(data)
}
func parseHtml(data string) string {
doc, err := goquery.NewDocumentFromReader(strings.NewReader(data))
content := string("")
if err != nil {
panic(err)
}
doc.Find(".rows.text-center").Each(func(i int, s *goquery.Selection) {
// For each item found, get the band and title
content = s.Find("h1").Text()
})
return content
}
func contains(slice []string, item string) bool {
set := make(map[string]struct{}, len(slice))
for _, s := range slice {
set[s] = struct{}{}
}
_, ok := set[item]
return ok
}
func occurrence(data []string, item string) int {
var count = 0
for _, v := range data {
if v == item {
count++
}
}
return count
}
func sendEmail(body string, subject string) {
auth := smtp.PlainAuth(
"",
username,
password,
"smtp.gmail.com",
)
msg := []byte("To: " + username + "\r\nSubject:" +
subject + "\r\n" +
"\r\n" + body +
"\r\n")
// Connect to the server, authenticate, set the sender and recipient,
// and send the email all in one step.
err := smtp.SendMail(
"smtp.gmail.com:587",
auth,
username,
[]string{username},
[]byte(msg),
)
if err != nil {
log.Fatal(err)
}
}