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package teams
import (
"fmt"
"regexp"
)
// Validation constants.
const (
UUID4Length = 36 // Length of a UUID4 identifier
HashLength = 32 // Length of a hash identifier
WebhookDomain = `\.webhook\.office\.com`
ExpectedComponents = 7 // Expected number of components in webhook URL (1 match + 6 captures)
Path = "webhookb2"
ProviderName = "IncomingWebhook"
AltIDIndex = 2 // Index of AltID in parts array
GroupOwnerIndex = 3 // Index of GroupOwner in parts array
)
var (
// HostValidator ensures the host matches the Teams webhook domain pattern.
HostValidator = regexp.MustCompile(`^[a-zA-Z0-9-]+\.webhook\.office\.com$`)
// WebhookURLValidator ensures the full webhook URL matches the Teams pattern.
WebhookURLValidator = regexp.MustCompile(
`^https://[a-zA-Z0-9-]+\.webhook\.office\.com/webhookb2/[0-9a-f-]{36}@[0-9a-f-]{36}/IncomingWebhook/[0-9a-f]{32}/[0-9a-f-]{36}/[^/]+$`,
)
)
// ValidateWebhookURL ensures the webhook URL is valid before use.
func ValidateWebhookURL(url string) error {
if !WebhookURLValidator.MatchString(url) {
return fmt.Errorf("%w: %q", ErrInvalidWebhookURL, url)
}
return nil
}
// ParseAndVerifyWebhookURL extracts and validates webhook components from a URL.
func ParseAndVerifyWebhookURL(webhookURL string) ([5]string, error) {
pattern := regexp.MustCompile(
`https://([a-zA-Z0-9-\.]+)` + WebhookDomain + `/` + Path + `/([0-9a-f\-]{36})@([0-9a-f\-]{36})/` + ProviderName + `/([0-9a-f]{32})/([0-9a-f\-]{36})/([^/]+)`,
)
groups := pattern.FindStringSubmatch(webhookURL)
if len(groups) != ExpectedComponents {
return [5]string{}, fmt.Errorf(
"%w: expected %d components, got %d",
ErrInvalidWebhookComponents,
ExpectedComponents,
len(groups),
)
}
parts := [5]string{groups[2], groups[3], groups[4], groups[5], groups[6]}
if err := verifyWebhookParts(parts); err != nil {
return [5]string{}, err
}
return parts, nil
}
// verifyWebhookParts ensures webhook components meet format requirements.
func verifyWebhookParts(parts [5]string) error {
type partSpec struct {
name string
length int
index int
optional bool
}
specs := []partSpec{
{name: "group ID", length: UUID4Length, index: 0, optional: true},
{name: "tenant ID", length: UUID4Length, index: 1, optional: true},
{name: "altID", length: HashLength, index: AltIDIndex, optional: true},
{name: "groupOwner", length: UUID4Length, index: GroupOwnerIndex, optional: true},
}
for _, spec := range specs {
if len(parts[spec.index]) != spec.length && parts[spec.index] != "" {
return fmt.Errorf(
"%w: %s must be %d characters, got %d",
ErrInvalidPartLength,
spec.name,
spec.length,
len(parts[spec.index]),
)
}
}
if parts[4] == "" {
return ErrMissingExtraID
}
return nil
}
// BuildWebhookURL constructs a Teams webhook URL from components.
func BuildWebhookURL(host, group, tenant, altID, groupOwner, extraID string) string {
// Host validation moved here for clarity
if !HostValidator.MatchString(host) {
return "" // Will trigger ErrInvalidHostFormat in caller
}
return fmt.Sprintf("https://%s/%s/%s@%s/%s/%s/%s/%s",
host, Path, group, tenant, ProviderName, altID, groupOwner, extraID)
}
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