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capabilities.go
100 lines (90 loc) · 2.12 KB
/
capabilities.go
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package caddytailscaleauth
import (
"encoding/json"
"fmt"
"net/http"
"regexp"
"strings"
"tailscale.com/tailcfg"
)
type capabilities struct {
DefaultAction string `json:"default_action"`
Rules []capabilityRule `json:"rules"`
}
type capabilityRule struct {
Action string `json:"action"`
PathRE string `json:"path_re"`
Methods []string `json:"method"`
}
type action string
const (
actionAllow action = "allow"
actionDeny action = "deny"
)
func parseAction(s string) (action, error) {
act := action(strings.ToLower(s))
switch act {
case actionAllow, actionDeny:
default:
return "", fmt.Errorf("invalid capability action %q", s)
}
return act, nil
}
type compiledCapabilities struct {
defaultAction action
rules []*compiledCapabilityRule
}
type compiledCapabilityRule struct {
action action
pathRE *regexp.Regexp
methods []string
}
func parseCapabilities(rawCaps tailcfg.RawMessage) (*compiledCapabilities, error) {
var caps capabilities
if err := json.Unmarshal([]byte(rawCaps), &caps); err != nil {
return nil, fmt.Errorf("failed to unmarshal capabilities %q: %w", rawCaps, err)
}
cc := &compiledCapabilities{
rules: make([]*compiledCapabilityRule, 0, len(caps.Rules)),
}
if caps.DefaultAction != "" {
var err error
cc.defaultAction, err = parseAction(caps.DefaultAction)
if err != nil {
return nil, err
}
}
for _, r := range caps.Rules {
pr, err := regexp.Compile(r.PathRE)
if err != nil {
return nil, fmt.Errorf("invalid capability path regular expression %q: %w", r.PathRE, err)
}
act, err := parseAction(r.Action)
if err != nil {
return nil, err
}
for i, m := range r.Methods {
m = strings.ToUpper(m)
r.Methods[i] = m
switch m {
case http.MethodGet,
http.MethodHead,
http.MethodPost,
http.MethodPut,
http.MethodPatch,
http.MethodDelete,
http.MethodConnect,
http.MethodOptions,
http.MethodTrace:
default:
return nil, fmt.Errorf("invalid capability method %q", m)
}
}
cc.rules = append(cc.rules, &compiledCapabilityRule{
action: act,
pathRE: pr,
methods: r.Methods,
})
}
return cc, nil
}