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100 lines
2.7 KiB
100 lines
2.7 KiB
package email
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import (
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"bytes"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"os"
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"time"
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)
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// resendEndpoint Resend 发信 API（走 HTTPS/443，规避国内出口 SMTP 被限速/信誉差导致的海外送达率问题）。
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const resendEndpoint = "https://api.resend.com/emails"
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// Resend 通过 Resend HTTP API 发信，实现 ISys。
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// 复用 Options.Password 承载 API Key（re_ 开头）；Options.FromEmail 须为在 Resend 已验证域名下的发件地址。
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type Resend struct {
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ApiKey string
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From string
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Name string
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}
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// resendAttachment Resend 附件：内容为 base64 编码。
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type resendAttachment struct {
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Filename string `json:"filename"`
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Content string `json:"content"`
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}
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// resendPayload Resend /emails 请求体。
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type resendPayload struct {
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From string `json:"from"`
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To []string `json:"to"`
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Subject string `json:"subject"`
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Html string `json:"html"`
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Attachments []resendAttachment `json:"attachments,omitempty"`
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}
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var resendClient = &http.Client{Timeout: 15 * time.Second}
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// fromAddr 拼成 "昵称 <邮箱>"（无昵称则仅邮箱）。
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func (this *Resend) fromAddr() string {
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if this.Name != "" {
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return fmt.Sprintf("%s <%s>", this.Name, this.From)
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}
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return this.From
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}
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// send 提交一次发信请求，非 2xx 视为失败并带回响应体。
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func (this *Resend) send(p *resendPayload) error {
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body, err := json.Marshal(p)
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if err != nil {
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return err
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}
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req, err := http.NewRequest(http.MethodPost, resendEndpoint, bytes.NewReader(body))
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Bearer "+this.ApiKey)
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req.Header.Set("Content-Type", "application/json")
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resp, err := resendClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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rb, _ := io.ReadAll(resp.Body)
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if resp.StatusCode < 200 || resp.StatusCode >= 300 {
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return fmt.Errorf("resend send failed: status=%d body=%s", resp.StatusCode, string(rb))
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}
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return nil
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}
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// SendMail 发送 HTML 邮件。
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func (this *Resend) SendMail(title, content string, to ...string) error {
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return this.send(&resendPayload{
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From: this.fromAddr(),
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To: to,
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Subject: title,
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Html: content,
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})
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}
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// SendMailForFile 发送带单个附件的 HTML 邮件。
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func (this *Resend) SendMailForFile(title string, content string, filepath string, filename string, to ...string) (err error) {
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data, err := os.ReadFile(filepath)
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if err != nil {
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return err
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}
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return this.send(&resendPayload{
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From: this.fromAddr(),
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To: to,
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Subject: title,
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Html: content,
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Attachments: []resendAttachment{{
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Filename: filename,
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Content: base64.StdEncoding.EncodeToString(data),
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}},
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})
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}
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