fix: Adjust custom http to notification provider (#2237)

* feat: Adjust custom http to notification provider

* fix go linter

* update ProviderEditPage

* update ProviderEditPage

notification/custom_http.go

@@ -0,0 +1,73 @@
+// 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 notification
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/casdoor/casdoor/proxy"
+)
+
+type HttpNotificationClient struct {
+	endpoint  string
+	method    string
+	paramName string
+}
+
+func NewCustomHttpProvider(endpoint string, method string, paramName string) (*HttpNotificationClient, error) {
+	client := &HttpNotificationClient{
+		endpoint:  endpoint,
+		method:    method,
+		paramName: paramName,
+	}
+	return client, nil
+}
+
+func (c *HttpNotificationClient) Send(ctx context.Context, subject string, content string) error {
+	var err error
+
+	httpClient := proxy.DefaultHttpClient
+
+	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{
+			c.paramName: {content},
+		}
+	} else if c.method == "GET" {
+		q := req.URL.Query()
+		q.Add(c.paramName, content)
+		req.URL.RawQuery = q.Encode()
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("SendMessage() error, custom HTTP Notification request failed with status: %s", resp.Status)
+	}
+
+	return err
+}