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url.go
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url.go
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package httpapi
import (
"fmt"
"net"
"regexp"
"strconv"
"strings"
"golang.org/x/xerrors"
)
var (
// Remove the "starts with" and "ends with" regex components.
nameRegex = strings.Trim(UsernameValidRegex.String(), "^$")
appURL = regexp.MustCompile(fmt.Sprintf(
// {PORT/APP_SLUG}--{AGENT_NAME}--{WORKSPACE_NAME}--{USERNAME}
`^(?P<AppSlug>%[1]s)--(?P<AgentName>%[1]s)--(?P<WorkspaceName>%[1]s)--(?P<Username>%[1]s)$`,
nameRegex))
validHostnameLabelRegex = regexp.MustCompile(`^[a-z0-9]([-a-z0-9]*[a-z0-9])?$`)
)
// ApplicationURL is a parsed application URL hostname.
type ApplicationURL struct {
// Only one of AppSlug or Port will be set.
AppSlug string
Port uint16
AgentName string
WorkspaceName string
Username string
}
// String returns the application URL hostname without scheme. You will likely
// want to append a period and the base hostname.
func (a ApplicationURL) String() string {
appSlugOrPort := a.AppSlug
if a.Port != 0 {
appSlugOrPort = strconv.Itoa(int(a.Port))
}
return fmt.Sprintf("%s--%s--%s--%s", appSlugOrPort, a.AgentName, a.WorkspaceName, a.Username)
}
// ParseSubdomainAppURL parses an ApplicationURL from the given subdomain. If
// the subdomain is not a valid application URL hostname, returns a non-nil
// error. If the hostname is not a subdomain of the given base hostname, returns
// a non-nil error.
//
// The base hostname should not include a scheme, leading asterisk or dot.
//
// Subdomains should be in the form:
//
// {PORT/APP_SLUG}--{AGENT_NAME}--{WORKSPACE_NAME}--{USERNAME}
// (eg. https://8080--main--dev--dean.hi.c8s.io)
func ParseSubdomainAppURL(subdomain string) (ApplicationURL, error) {
matches := appURL.FindAllStringSubmatch(subdomain, -1)
if len(matches) == 0 {
return ApplicationURL{}, xerrors.Errorf("invalid application url format: %q", subdomain)
}
matchGroup := matches[0]
appSlug, port := AppSlugOrPort(matchGroup[appURL.SubexpIndex("AppSlug")])
return ApplicationURL{
AppSlug: appSlug,
Port: port,
AgentName: matchGroup[appURL.SubexpIndex("AgentName")],
WorkspaceName: matchGroup[appURL.SubexpIndex("WorkspaceName")],
Username: matchGroup[appURL.SubexpIndex("Username")],
}, nil
}
// AppSlugOrPort takes a string and returns either the input string or a port
// number.
func AppSlugOrPort(val string) (string, uint16) {
port, err := strconv.ParseUint(val, 10, 16)
if err != nil || port == 0 {
port = 0
} else {
val = ""
}
return val, uint16(port)
}
// HostnamesMatch returns true if the hostnames are equal, disregarding
// capitalization, extra leading or trailing periods, and ports.
func HostnamesMatch(a, b string) bool {
a = strings.Trim(a, ".")
b = strings.Trim(b, ".")
aHost, _, err := net.SplitHostPort(a)
if err != nil {
aHost = a
}
bHost, _, err := net.SplitHostPort(b)
if err != nil {
bHost = b
}
return strings.EqualFold(aHost, bHost)
}
// CompileHostnamePattern compiles a hostname pattern into a regular expression.
// A hostname pattern is a string that may contain a single wildcard character
// at the beginning. The wildcard character matches any number of hostname-safe
// characters excluding periods. The pattern is case-insensitive.
//
// The supplied pattern:
// - must not start or end with a period
// - must contain exactly one asterisk at the beginning
// - must not contain any other wildcard characters
// - must not contain any other characters that are not hostname-safe (including
// whitespace)
// - must contain at least two hostname labels/segments (i.e. "foo" or "*" are
// not valid patterns, but "foo.bar" and "*.bar" are).
//
// The returned regular expression will match an entire hostname with optional
// trailing periods and whitespace. The first submatch will be the wildcard
// match.
func CompileHostnamePattern(pattern string) (*regexp.Regexp, error) {
pattern = strings.ToLower(pattern)
if strings.Contains(pattern, "http:") || strings.Contains(pattern, "https:") {
return nil, xerrors.Errorf("hostname pattern must not contain a scheme: %q", pattern)
}
if strings.Contains(pattern, ":") {
return nil, xerrors.Errorf("hostname pattern must not contain a port: %q", pattern)
}
if strings.HasPrefix(pattern, ".") || strings.HasSuffix(pattern, ".") {
return nil, xerrors.Errorf("hostname pattern must not start or end with a period: %q", pattern)
}
if strings.Count(pattern, ".") < 1 {
return nil, xerrors.Errorf("hostname pattern must contain at least two labels/segments: %q", pattern)
}
if strings.Count(pattern, "*") != 1 {
return nil, xerrors.Errorf("hostname pattern must contain exactly one asterisk: %q", pattern)
}
if !strings.HasPrefix(pattern, "*") {
return nil, xerrors.Errorf("hostname pattern must only contain an asterisk at the beginning: %q", pattern)
}
for i, label := range strings.Split(pattern, ".") {
if i == 0 {
// We have to allow the asterisk to be a valid hostname label.
label = strings.TrimPrefix(label, "*")
label = "a" + label
}
if !validHostnameLabelRegex.MatchString(label) {
return nil, xerrors.Errorf("hostname pattern contains invalid label %q: %q", label, pattern)
}
}
// Replace periods with escaped periods.
regexPattern := strings.ReplaceAll(pattern, ".", "\\.")
// Capture wildcard match.
regexPattern = strings.Replace(regexPattern, "*", "([^.]+)", 1)
// Allow trailing period.
regexPattern = regexPattern + "\\.?"
// Allow optional port number.
regexPattern += "(:\\d+)?"
// Allow leading and trailing whitespace.
regexPattern = `^\s*` + regexPattern + `\s*$`
return regexp.Compile(regexPattern)
}
// ExecuteHostnamePattern executes a pattern generated by CompileHostnamePattern
// and returns the wildcard match. If the pattern does not match the hostname,
// returns false.
func ExecuteHostnamePattern(pattern *regexp.Regexp, hostname string) (string, bool) {
matches := pattern.FindStringSubmatch(hostname)
if len(matches) < 2 {
return "", false
}
return matches[1], true
}