feat: add custom HTTP Email provider (#2542)

* feat: implement Custom HTTP Email provider

* Update Setting.js

* Update ProviderEditPage.js

* Update http.go

* Update provider.go

---------

Co-authored-by: hsluoyz <hsluoyz@qq.com>

email/http.go

@@ -0,0 +1,75 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package email
+
+import (
+	"bytes"
+	"fmt"
+	"net/http"
+
+	"github.com/casdoor/casdoor/proxy"
+)
+
+type HttpEmailProvider struct {
+	endpoint string
+	method   string
+}
+
+func NewHttpEmailProvider(endpoint string, method string) *HttpEmailProvider {
+	client := &HttpEmailProvider{
+		endpoint: endpoint,
+		method:   method,
+	}
+	return client
+}
+
+func (c *HttpEmailProvider) Send(fromAddress string, fromName string, toAddress string, subject string, content string) error {
+	req, err := http.NewRequest(c.method, c.endpoint, bytes.NewBufferString(content))
+	if err != nil {
+		return err
+	}
+
+	if c.method == "POST" {
+		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+		req.PostForm = map[string][]string{
+			"fromName":  {fromName},
+			"toAddress": {toAddress},
+			"subject":   {subject},
+			"content":   {content},
+		}
+	} else if c.method == "GET" {
+		q := req.URL.Query()
+		q.Add("fromName", fromName)
+		q.Add("toAddress", toAddress)
+		q.Add("subject", subject)
+		q.Add("content", content)
+		req.URL.RawQuery = q.Encode()
+	} else {
+		return fmt.Errorf("HttpEmailProvider's Send() error, unsupported method: %s", c.method)
+	}
+
+	httpClient := proxy.DefaultHttpClient
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("HttpEmailProvider's Send() error, custom HTTP Email request failed with status: %s", resp.Status)
+	}
+
+	return err
+}

email/provider.go

@@ -18,9 +18,11 @@ type EmailProvider interface {
 	Send(fromAddress string, fromName, toAddress string, subject string, content string) error
 }
 
-func GetEmailProvider(typ string, clientId string, clientSecret string, host string, port int, disableSsl bool) EmailProvider {
+func GetEmailProvider(typ string, clientId string, clientSecret string, host string, port int, disableSsl bool, endpoint string, method string) EmailProvider {
 	if typ == "Azure ACS" {
 		return NewAzureACSEmailProvider(clientSecret, host)
+	} else if typ == "Custom HTTP Email" {
+		return NewHttpEmailProvider(endpoint, method)
 	} else {
 		return NewSmtpEmailProvider(clientId, clientSecret, host, port, typ, disableSsl)
 	}

object/email.go

@@ -36,7 +36,7 @@ func getDialer(provider *Provider) *gomail.Dialer {
 }
 
 func SendEmail(provider *Provider, title string, content string, dest string, sender string) error {
-	emailProvider := email.GetEmailProvider(provider.Type, provider.ClientId, provider.ClientSecret, provider.Host, provider.Port, provider.DisableSsl)
+	emailProvider := email.GetEmailProvider(provider.Type, provider.ClientId, provider.ClientSecret, provider.Host, provider.Port, provider.DisableSsl, provider.Endpoint, provider.Method)
 
 	fromAddress := provider.ClientId2
 	if fromAddress == "" {

web/src/ProviderEditPage.js

@@ -528,9 +528,12 @@ class ProviderEditPage extends React.Component {
                 this.updateProviderField("customTokenUrl", "https://door.casdoor.com/api/login/oauth/access_token");
                 this.updateProviderField("customUserInfoUrl", "https://door.casdoor.com/api/userinfo");
               } else if (value === "Custom HTTP SMS") {
-                this.updateProviderField("endpoint", "https://example.com/send-custom-http");
+                this.updateProviderField("endpoint", "https://example.com/send-custom-http-sms");
                 this.updateProviderField("method", "GET");
                 this.updateProviderField("title", "code");
+              } else if (value === "Custom HTTP Email") {
+                this.updateProviderField("endpoint", "https://example.com/send-custom-http-email");
+                this.updateProviderField("method", "POST");
               } else if (value === "Custom HTTP") {
                 this.updateProviderField("method", "GET");
                 this.updateProviderField("title", "");
@@ -768,7 +771,7 @@ class ProviderEditPage extends React.Component {
             </Row>
           )
         }
-        {this.state.provider.category === "Storage" || this.state.provider.type === "Custom HTTP SMS" ? (
+        {this.state.provider.category === "Storage" || ["Custom HTTP SMS", "Custom HTTP Email"].includes(this.state.provider.type) ? (
           <div>
             {["Local File System"].includes(this.state.provider.type) ? null : (
               <Row style={{marginTop: "20px"}} >
@@ -1017,7 +1020,7 @@ class ProviderEditPage extends React.Component {
                 )
               }
               {
-                !["Custom HTTP SMS"].includes(this.state.provider.type) ? null : (
+                !["Custom HTTP SMS", "Custom HTTP Email"].includes(this.state.provider.type) ? null : (
                   <React.Fragment>
                     <Row style={{marginTop: "20px"}} >
                       <Col style={{marginTop: "5px"}} span={2}>

web/src/Setting.js

@@ -169,6 +169,10 @@ export const OtherProviderInfo = {
       logo: `${StaticBaseUrl}/img/social_azure.png`,
       url: "https://learn.microsoft.com/zh-cn/azure/communication-services",
     },
+    "Custom HTTP Email": {
+      logo: `${StaticBaseUrl}/img/social_default.png`,
+      url: "https://casdoor.org/docs/provider/email/overview",
+    },
   },
   Storage: {
     "Local File System": {
@@ -985,6 +989,7 @@ export function getProviderTypeOptions(category) {
         {id: "SUBMAIL", name: "SUBMAIL"},
         {id: "Mailtrap", name: "Mailtrap"},
         {id: "Azure ACS", name: "Azure ACS"},
+        {id: "Custom HTTP Email", name: "Custom HTTP Email"},
       ]
     );
   } else if (category === "SMS") {