Add Path/Query Escape functions

Signed-off-by: Luca Bigliardi <shammash@google.com>

format.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"log"
+	"net/url"
 	"strings"
 	"text/template"
 
@@ -34,6 +35,9 @@ func NewFormatter(config *Config) (*Formatter, error) {
 		"ToUpper": strings.ToUpper,
 		"ToLower": strings.ToLower,
 		"Join":    strings.Join,
+
+		"QueryEscape": url.QueryEscape,
+		"PathEscape":  url.PathEscape,
 	}
 
 	tmpl, err := template.New("msg").Funcs(funcMap).Parse(config.MsgTemplate)

format_test.go

@@ -90,3 +90,22 @@ func TestStringsFunctions(t *testing.T) {
 
 	CreateFormatterAndCheckOutput(t, &testingConfig, expectedAlertMsgs)
 }
+
+func TestUrlFunctions(t *testing.T) {
+	testingConfig := Config{
+		MsgTemplate: "{{ .Annotations.SUMMARY | PathEscape }}",
+	}
+
+	expectedAlertMsgs := []AlertMsg{
+		AlertMsg{
+			Channel: "#somechannel",
+			Alert:   "service%20%2Fprometheus%20air%20down%20on%20instance1",
+		},
+		AlertMsg{
+			Channel: "#somechannel",
+			Alert:   "service%20%2Fprometheus%20air%20down%20on%20instance2",
+		},
+	}
+
+	CreateFormatterAndCheckOutput(t, &testingConfig, expectedAlertMsgs)
+}