How to use the time function in Go language to generate a schedule calendar and generate SMS, email and WeChat reminders?

How to use the time function in Go language to generate a schedule calendar and generate SMS, email and WeChat reminders?

Time management is very important for each of us. Whether it is personal life or work matters, we need to arrange our time reasonably in order to complete various tasks efficiently. In daily life, we can help ourselves manage time by using a schedule calendar. In the technical field, we can use the time function in the Go language to implement a schedule and calendar, and remind ourselves to complete tasks in time through SMS, email and WeChat reminders. This article will introduce how to use the time function in the Go language to generate a schedule calendar, and demonstrate through code examples how to implement the functions of SMS, email and WeChat reminders.

1. Use the time function in Go language to generate a schedule calendar

In Go language, we can use the time package to handle time and date. First, we need to import the time package:

import (
    "fmt"
    "time"
)

Next, we can get the current time through the time.Now() function:

now := time.Now()

To generate a schedule calendar, we can use time.Date () function specifies date and time:

eventDate := time.Date(2022, 1, 1, 10, 0, 0, 0, time.UTC)

In the above code, we specify 10 am on January 1, 2022 as the schedule date.

To determine whether the current time is before the schedule calendar, you can use the Before() function:

if now.Before(eventDate) {
    fmt.Println("当前时间在日程日历之前")
} else {
    fmt.Println("当前时间在日程日历之后")
}

With the above code, we can determine whether it is before the schedule calendar based on the current time.

2. Generate text messages, emails and WeChat reminders

In real life and work, we will want to remind ourselves to complete tasks through text messages, emails or WeChat reminders. The following will introduce how to use Go language to generate text messages, emails and WeChat reminders.

2.1 Generate SMS reminder

We can use the API of the SMS service provider to send SMS reminders. Assuming that we use Alibaba Cloud's SMS service, we first need to register an account and obtain an API key. We can use the Go language's net/http package to send HTTP requests to call APIs and send SMS reminders.

func sendSMS(phoneNumber string, content string) error {
    apiKey := "your_api_key"
    secret := "your_secret"
    apiUrl := "https://dysmsapi.aliyuncs.com"

    httpClient := &http.Client{}
    params := url.Values{}
    params.Set("Action", "SendSms")
    params.Set("Format", "json")
    params.Set("PhoneNumbers", phoneNumber)
    params.Set("SignName", "your_sign_name")
    params.Set("TemplateCode", "your_template_code")
    params.Set("TemplateParam", `{"content": "`+content+`"}`)
    params.Set("AccessKeyId", apiKey)
    params.Set("SignatureMethod", "HMAC-SHA1")
    params.Set("SignatureNonce", strconv.FormatInt(int64(time.Now().UnixNano()/1e6), 10))
    params.Set("SignatureVersion", "1.0")
    params.Set("Timestamp", time.Now().UTC().Format("2006-01-02T15:04:05Z"))
    params.Set("Version", "2017-05-25")

    keys := []string{}
    for k := range params {
        keys = append(keys, k)
    }
    sort.Strings(keys)

    var signString string
    for _, k := range keys {
        signString += "&" + percentEncode(k) + "=" + percentEncode(params.Get(k))
    }

    signStringToSign := "POST&%2F&" + percentEncode(signString[1:])

    mac := hmac.New(sha1.New, []byte(secret+"&"))
    mac.Write([]byte(signStringToSign))

    signature := base64.StdEncoding.EncodeToString(mac.Sum(nil))

    url := apiUrl + "?" + signString + "&Signature=" + percentEncode(signature)

    req, err := http.NewRequest("POST", url, nil)
    if err != nil {
        return err
    }

    resp, err := httpClient.Do(req)
    if err != nil {
        return err
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return err
    }

    fmt.Println(string(body))

    return nil
}

func percentEncode(s string) string {
    s = url.QueryEscape(s)
    s = strings.Replace(s, "+", "%20", -1)
    s = strings.Replace(s, "*", "%2A", -1)
    s = strings.Replace(s, "%7E", "~", -1)
    return s
}

The above code is a simple function to send SMS reminders. We need to replace the API Key, Secret, SMS signature, template code and other information. Then, we can call the sendSMS() function where we need to send SMS reminders.

2.2 Generate email reminder

We can use the net/smtp package of Go language to send email reminders. Assuming that we use QQ mailbox as the sender's mailbox, we first need to obtain the SMTP server address and port number of the mailbox, and configure the user name and password of the sender's mailbox.

func sendEmail(toEmail string, subject string, content string) error {
    smtpHost := "smtp.qq.com"
    smtpPort := 587
    smtpUsername := "your_email@example.com"
    smtpPassword := "your_password"

    auth := smtp.PlainAuth("", smtpUsername, smtpPassword, smtpHost)

    body := "To: " + toEmail + "
" +
        "Subject: " + subject + "
" +
        "Content-Type: text/plain; charset=UTF-8
" +
        "
" +
        content

    err := smtp.SendMail(smtpHost+":"+strconv.Itoa(smtpPort), auth, smtpUsername, []string{toEmail}, []byte(body))
    if err != nil {
        return err
    }

    return nil
}

The above code is a simple function that sends email reminders. We need to replace the SMTP server address, port number, sender email address, password and other information. Then, we can call the sendEmail() function wherever we need to send email reminders.

2.3 Generate WeChat reminder

To generate WeChat reminder, we can use the template message interface provided by WeChat open platform. First, we need to register an account on the WeChat open platform and create an application to obtain the AppID and AppSecret.

func sendWechat(openID string, templateID string, content string) error {
    apiURL := "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token="

    appID := "your_app_id"
    appSecret := "your_app_secret"

    res, err := http.Get(apiURL + getAccessToken(appID, appSecret))
    if err != nil {
        return err
    }
    defer res.Body.Close()

    var result map[string]interface{}
    json.NewDecoder(res.Body).Decode(&result)

    accessToken := result["access_token"].(string)

    message := map[string]interface{}{
        "touser":      openID,
        "template_id": templateID,
        "data": map[string]interface{}{
            "content": map[string]string{
                "value": content,
            },
        },
    }

    requestBody, err := json.Marshal(message)
    if err != nil {
        return err
    }

    response, err := http.Post(apiURL+accessToken, "application/json", bytes.NewBuffer(requestBody))
    if err != nil {
        return err
    }
    defer response.Body.Close()

    return nil
}

func getAccessToken(appID string, appSecret string) string {
    res, _ := http.Get("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appID + "&secret=" + appSecret)
    defer res.Body.Close()

    var result map[string]interface{}
    json.NewDecoder(res.Body).Decode(&result)

    accessToken := result["access_token"].(string)
    return accessToken
}

The above code is a simple function to send WeChat reminders. We need to replace the AppID and AppSecret information. Then, we can call the sendWechat() function wherever we need to send WeChat reminders.

In actual use, you can choose the reminder method to be used as needed, and integrate the code into the schedule calendar to realize the automatic reminder function.

Summary:

This article introduces how to use the time function in the Go language to generate a schedule calendar, and remind yourself to complete tasks in time through SMS, email and WeChat reminders. The code example shows how to send SMS, email and WeChat reminders, and provides corresponding configuration instructions. Using these reminders can help us better manage time and improve work and life efficiency. Hope this article helps you!

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