132 lines
3.1 KiB
Go
132 lines
3.1 KiB
Go
package env
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/zclconf/go-cty/cty"
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)
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var (
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// ErrInvalidObjectPath is returned when a key cannot be converted into
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// a nested object path like "foo...bar", ".foo", or "foo."
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ErrInvalidObjectPath = errors.New("invalid object path")
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)
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type ErrKeyExists struct {
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msg string
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}
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func NewErrKeyExists(newKey, oldKey string) *ErrKeyExists {
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return &ErrKeyExists{
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msg: fmt.Sprintf(
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"cannot add key %q because %q already exists with a different type",
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newKey, oldKey,
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),
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}
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}
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func (e *ErrKeyExists) Error() string {
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return e.msg
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}
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// addNestedKey expands keys into their nested form:
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//
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// k="foo.bar", v="quux" -> {"foo": {"bar": "quux"}}
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//
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// Existing keys are overwritten.
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//
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// If the key has dots but cannot be converted to a valid nested data structure
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// (eg "foo...bar", "foo.", or non-object value exists for key), an error is
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// returned.
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func addNestedKey(dst map[string]interface{}, k, v string) error {
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// createdParent and Key capture the parent object of the first created
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// object and the first created object's key respectively. The cleanup
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// func deletes them to prevent side-effects when returning errors.
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var createdParent map[string]interface{}
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var createdKey string
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cleanup := func() {
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if createdParent != nil {
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delete(createdParent, createdKey)
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}
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}
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segments := strings.Split(k, ".")
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for _, newKey := range segments[:len(segments)-1] {
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if newKey == "" {
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// String either begins with a dot (.foo) or has at
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// least two consecutive dots (foo..bar); either way
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// it's an invalid object path.
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cleanup()
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return ErrInvalidObjectPath
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}
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var target map[string]interface{}
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if existingI, ok := dst[newKey]; ok {
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existing, ok := existingI.(map[string]interface{})
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if !ok {
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// Existing value is not a map, unable to support this key
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cleanup()
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return NewErrKeyExists(k, newKey)
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}
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target = existing
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} else {
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// Does not exist, create
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target = make(map[string]interface{})
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dst[newKey] = target
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// If this is the first created key, capture it for
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// cleanup if there is an error later.
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if createdParent == nil {
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createdParent = dst
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createdKey = newKey
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}
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}
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// Descend into new m
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dst = target
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}
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// See if the final segment is a valid key
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newKey := segments[len(segments)-1]
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if newKey == "" {
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// String ends in a dot
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cleanup()
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return ErrInvalidObjectPath
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}
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dst[newKey] = v
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return nil
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}
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// ctyify converts nested map[string]interfaces to a map[string]cty.Value. An
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// error is returned if an unsupported type is encountered.
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//
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// Currently only strings, cty.Values, and nested maps are supported.
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func ctyify(src map[string]interface{}) (map[string]cty.Value, error) {
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dst := make(map[string]cty.Value, len(src))
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for k, vI := range src {
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switch v := vI.(type) {
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case string:
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dst[k] = cty.StringVal(v)
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case cty.Value:
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dst[k] = v
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case map[string]interface{}:
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o, err := ctyify(v)
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if err != nil {
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return nil, err
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}
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dst[k] = cty.ObjectVal(o)
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default:
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return nil, fmt.Errorf("key %q has invalid type %T", k, v)
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}
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}
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return dst, nil
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}
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