refactor webhook *NewPost (#20729)

* refactor webhook *NewPost

* remove empty values

* always show errs.Message

* remove utils.IsValidSlackChannel

* move IsValidSlackChannel to services/webhook package

* binding: handle empty Message case

* make IsValidSlackChannel more strict

services/webhook/slack.go

@@ -7,6 +7,7 @@ package webhook
 import (
 	"errors"
 	"fmt"
+	"regexp"
 	"strings"
 
 	webhook_model "code.gitea.io/gitea/models/webhook"
@@ -286,3 +287,13 @@ func GetSlackPayload(p api.Payloader, event webhook_model.HookEventType, meta st
 
 	return convertPayloader(s, p, event)
 }
+
+var slackChannel = regexp.MustCompile(`^#?[a-z0-9_-]{1,80}$`)
+
+// IsValidSlackChannel validates a channel name conforms to what slack expects:
+// https://api.slack.com/methods/conversations.rename#naming
+// Conversation names can only contain lowercase letters, numbers, hyphens, and underscores, and must be 80 characters or less.
+// Gitea accepts if it starts with a #.
+func IsValidSlackChannel(name string) bool {
+	return slackChannel.MatchString(name)
+}

services/webhook/slack_test.go

@@ -170,3 +170,22 @@ func TestSlackJSONPayload(t *testing.T) {
 	require.NoError(t, err)
 	assert.NotEmpty(t, json)
 }
+
+func TestIsValidSlackChannel(t *testing.T) {
+	tt := []struct {
+		channelName string
+		expected    bool
+	}{
+		{"gitea", true},
+		{"#gitea", true},
+		{"  ", false},
+		{"#", false},
+		{" #", false},
+		{"gitea   ", false},
+		{"  gitea", false},
+	}
+
+	for _, v := range tt {
+		assert.Equal(t, v.expected, IsValidSlackChannel(v.channelName))
+	}
+}