fix(alerting): Resolve Slack issue with bad payload when condition has " in it

alerting/provider/slack/slack.go

@@ -2,6 +2,7 @@ package slack
 
 import (
 	"bytes"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
@@ -59,9 +60,28 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
 	return err
 }
 
+type Body struct {
+	Text        string       `json:"text"`
+	Attachments []Attachment `json:"attachments"`
+}
+
+type Attachment struct {
+	Title  string  `json:"title"`
+	Text   string  `json:"text"`
+	Short  bool    `json:"short"`
+	Color  string  `json:"color"`
+	Fields []Field `json:"fields"`
+}
+
+type Field struct {
+	Title string `json:"title"`
+	Value string `json:"value"`
+	Short bool   `json:"short"`
+}
+
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) string {
-	var message, color, results string
+func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
+	var message, color string
 	if resolved {
 		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
 		color = "#36A64F"
@@ -69,37 +89,39 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
 		color = "#DD0000"
 	}
-	for _, conditionResult := range result.ConditionResults {
+	fields := make([]Field, len(result.ConditionResults))
+	for i, conditionResult := range result.ConditionResults {
 		var prefix string
 		if conditionResult.Success {
 			prefix = ":white_check_mark:"
 		} else {
 			prefix = ":x:"
 		}
-		results += fmt.Sprintf("%s - `%s`\\n", prefix, conditionResult.Condition)
+		fields[i] = Field{
+			Value: fmt.Sprintf("%s - `%s`", prefix, conditionResult.Condition),
+			Short: false,
+		}
+		if i == 0 {
+			fields[i].Title = "Condition results"
+		}
 	}
 	var description string
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
-		description = ":\\n> " + alertDescription
+		description = ":\n> " + alertDescription
 	}
-	return fmt.Sprintf(`{
-  "text": "",
-  "attachments": [
-    {
-      "title": ":helmet_with_white_cross: Gatus",
-      "text": "%s%s",
-      "short": false,
-      "color": "%s",
-      "fields": [
-        {
-          "title": "Condition results",
-          "value": "%s",
-          "short": false
-        }
-      ]
-    }
-  ]
-}`, message, description, color, results)
+	body, _ := json.Marshal(Body{
+		Text: "",
+		Attachments: []Attachment{
+			{
+				Title:  ":helmet_with_white_cross: Gatus",
+				Text:   message + description,
+				Short:  false,
+				Color:  color,
+				Fields: fields,
+			},
+		},
+	})
+	return body
 }
 
 // getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group