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package hook
import (
"errors"
"fmt"
"regexp"
rspec "github.com/opencontainers/runtime-spec/specs-go"
)
// When holds hook-injection conditions.
type When struct {
Always *bool `json:"always,omitempty"`
Annotations map[string]string `json:"annotations,omitempty"`
Commands []string `json:"commands,omitempty"`
HasBindMounts *bool `json:"hasBindMounts,omitempty"`
// Or enables any-of matching.
//
// Deprecated: this property is for is backwards-compatibility with
// 0.1.0 hooks. It will be removed when we drop support for them.
Or bool `json:"-"`
}
// Match returns true if the given conditions match the configuration.
func (when *When) Match(config *rspec.Spec, annotations map[string]string, hasBindMounts bool) (match bool, err error) {
matches := 0
if when.Always != nil {
if *when.Always {
if when.Or {
return true, nil
}
matches++
} else if !when.Or {
return false, nil
}
}
if when.HasBindMounts != nil {
if *when.HasBindMounts && hasBindMounts {
if when.Or {
return true, nil
}
matches++
} else if !when.Or {
return false, nil
}
}
for keyPattern, valuePattern := range when.Annotations {
match := false
for key, value := range annotations {
match, err = regexp.MatchString(keyPattern, key)
if err != nil {
return false, fmt.Errorf("annotation key: %w", err)
}
if match {
match, err = regexp.MatchString(valuePattern, value)
if err != nil {
return false, fmt.Errorf("annotation value: %w", err)
}
if match {
break
}
}
}
if match {
if when.Or {
return true, nil
}
matches++
} else if !when.Or {
return false, nil
}
}
if config.Process != nil && len(when.Commands) > 0 {
if len(config.Process.Args) == 0 {
return false, errors.New("process.args must have at least one entry")
}
command := config.Process.Args[0]
for _, cmdPattern := range when.Commands {
match, err := regexp.MatchString(cmdPattern, command)
if err != nil {
return false, fmt.Errorf("command: %w", err)
}
if match {
return true, nil
}
}
return false, nil
}
return matches > 0, nil
}
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