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path_policy.go
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/
path_policy.go
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package pathpolicy
import (
"fmt"
"path"
)
type PathPolicy struct {
Deny bool // explicitly do not allow this entry
Exact bool // require and exact match, no subdirs
}
type PathPolicies = PathTrie
// Create a new PathPolicies trie from a map of path to PathPolicy
func NewPathPolicies(entries map[string]PathPolicy) *PathPolicies {
noType := make(map[string]interface{}, len(entries))
for k, v := range entries {
noType[k] = v
}
return NewPathTrieFromMap(noType)
}
// Check a given path against the PathPolicies
func (pol *PathPolicies) Check(fsPath string) error {
// Quickly check we have a path and it is absolute
if fsPath == "" || fsPath[0] != '/' {
return fmt.Errorf("path must be absolute")
}
// ensure that only clean paths are valid
if fsPath != path.Clean(fsPath) {
return fmt.Errorf("path must be canonical")
}
node, left := pol.Lookup(fsPath)
policy, ok := node.Payload.(PathPolicy)
if !ok {
panic("programming error: invalid path trie payload")
}
// 1) path is explicitly not allowed or
// 2) a subpath was match but an explicit match is required
if policy.Deny || (policy.Exact && len(left) > 0) {
return fmt.Errorf("path '%s ' is not allowed", fsPath)
}
// exact match or recursive path allowed
return nil
}