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Add options KeyPreserveCase() and KeyNormalizer(func (string) string)

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This commit is contained in:
Dmitry Irtegov 2020-03-03 00:14:43 +07:00 committed by Oleg Chunikhin
parent 3970ad177e
commit bde4ac488a
4 changed files with 157 additions and 50 deletions
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40
util.go
View file

@ -31,31 +31,31 @@ func (pe ConfigParseError) Error() string {
return fmt.Sprintf("While parsing config: %s", pe.err.Error())
}
// toCaseInsensitiveValue checks if the value is a map;
// if so, create a copy and lower-case the keys recursively.
func toCaseInsensitiveValue(value interface{}) interface{} {
// toCaseInsensitiveValue checks if the value is a map;
// if so, create a copy and lower-case (normalize) the keys recursively.
func toCaseInsensitiveValue(value interface{}, normalize keyNormalizeHookType) interface{} {
switch v := value.(type) {
case map[interface{}]interface{}:
value = copyAndInsensitiviseMap(cast.ToStringMap(v))
value = copyAndInsensitiviseMap(cast.ToStringMap(v), normalize)
case map[string]interface{}:
value = copyAndInsensitiviseMap(v)
value = copyAndInsensitiviseMap(v, normalize)
}
return value
}
// copyAndInsensitiviseMap behaves like insensitiviseMap, but creates a copy of
// any map it makes case insensitive.
func copyAndInsensitiviseMap(m map[string]interface{}) map[string]interface{} {
// any map it makes case insensitive (normalized).
func copyAndInsensitiviseMap(m map[string]interface{}, normalize keyNormalizeHookType) map[string]interface{} {
nm := make(map[string]interface{})
for key, val := range m {
lkey := strings.ToLower(key)
lkey := normalize(key)
switch v := val.(type) {
case map[interface{}]interface{}:
nm[lkey] = copyAndInsensitiviseMap(cast.ToStringMap(v))
nm[lkey] = copyAndInsensitiviseMap(cast.ToStringMap(v), normalize)
case map[string]interface{}:
nm[lkey] = copyAndInsensitiviseMap(v)
nm[lkey] = copyAndInsensitiviseMap(v, normalize)
default:
nm[lkey] = v
}
@ -64,26 +64,26 @@ func copyAndInsensitiviseMap(m map[string]interface{}) map[string]interface{} {
return nm
}
func insensitiviseVal(val interface{}) interface{} {
switch val.(type) {
func insensitiviseVal(val interface{}, normalize keyNormalizeHookType) interface{} {
switch valT := val.(type) {
case map[interface{}]interface{}:
// nested map: cast and recursively insensitivise
val = cast.ToStringMap(val)
insensitiviseMap(val.(map[string]interface{}))
insensitiviseMap(val.(map[string]interface{}), normalize)
case map[string]interface{}:
// nested map: recursively insensitivise
insensitiviseMap(val.(map[string]interface{}))
insensitiviseMap(valT, normalize)
case []interface{}:
// nested array: recursively insensitivise
insensitiveArray(val.([]interface{}))
insensitiveArray(valT, normalize)
}
return val
}
func insensitiviseMap(m map[string]interface{}) {
func insensitiviseMap(m map[string]interface{}, normalize keyNormalizeHookType) {
for key, val := range m {
val = insensitiviseVal(val)
lower := strings.ToLower(key)
val = insensitiviseVal(val, normalize)
lower := normalize(key)
if key != lower {
// remove old key (not lower-cased)
delete(m, key)
@ -93,9 +93,9 @@ func insensitiviseMap(m map[string]interface{}) {
}
}
func insensitiveArray(a []interface{}) {
func insensitiveArray(a []interface{}, normalize keyNormalizeHookType) {
for i, val := range a {
a[i] = insensitiviseVal(val)
a[i] = insensitiviseVal(val, normalize)
}
}

3
util_test.go
View file

@ -14,6 +14,7 @@ import (
"os"
"path/filepath"
"reflect"
"strings"
"testing"
"github.com/spf13/viper/internal/testutil"
@ -37,7 +38,7 @@ func TestCopyAndInsensitiviseMap(t *testing.T) {
}
)
got := copyAndInsensitiviseMap(given)
got := copyAndInsensitiviseMap(given, strings.ToLower)
if !reflect.DeepEqual(got, expected) {
t.Fatalf("Got %q\nexpected\n%q", got, expected)

94
viper.go
View file

@ -142,6 +142,10 @@ func DecodeHook(hook mapstructure.DecodeHookFunc) DecoderConfigOption {
}
}
type keyNormalizeHookType func(string) string
var defaultKeyNormalizer = strings.ToLower
// Viper is a prioritized configuration registry. It
// maintains a set of configuration sources, fetches
// values to populate those, and provides them according
@ -183,6 +187,10 @@ type Viper struct {
// used to access a nested value in one go
keyDelim string
// Function to normalize keys
// by default, strings.ToLower
keyNormalizeHook keyNormalizeHookType
// A set of paths to look for the config file in
configPaths []string
@ -229,6 +237,7 @@ type Viper struct {
func New() *Viper {
v := new(Viper)
v.keyDelim = "."
v.keyNormalizeHook = defaultKeyNormalizer
v.configName = "config"
v.configPermissions = os.FileMode(0o644)
v.fs = afero.NewOsFs()
@ -270,6 +279,23 @@ func KeyDelimiter(d string) Option {
})
}
// KeyNormalizer is option to set arbitrary function for key normalization
// This function will be applied to all keys after unmarshal, during merge, search for duplicates, etc
// Default normalizer is strings.ToLower
func KeyNormalizer(n keyNormalizeHookType) Option {
return optionFunc(func(v *Viper) {
v.keyNormalizeHook = n
})
}
// KeyPreserveCase is option to disable key lowercasing
// By default, Viper converts all keys to lovercase
func KeyPreserveCase() Option {
return optionFunc(func(v *Viper) {
v.keyNormalizeHook = func(key string) string { return key }
})
}
// StringReplacer applies a set of replacements to a string.
type StringReplacer interface {
// Replace returns a copy of s with all replacements performed.
@ -523,6 +549,13 @@ func (v *Viper) SetEnvPrefix(in string) {
}
}
func (v *Viper) keyNormalize(k string) string {
if v.keyNormalizeHook != nil {
return v.keyNormalizeHook(k)
}
return defaultKeyNormalizer(k)
}
func (v *Viper) mergeWithEnvPrefix(in string) string {
if v.envPrefix != "" {
return strings.ToUpper(v.envPrefix + "_" + in)
@ -652,7 +685,7 @@ func (v *Viper) providerPathExists(p *defaultRemoteProvider) bool {
// searchMap recursively searches for a value for path in source map.
// Returns nil if not found.
// Note: This assumes that the path entries and map keys are lower cased.
// Note: This assumes that the path entries and map keys are normalized (by default, lowercased).
func (v *Viper) searchMap(source map[string]interface{}, path []string) interface{} {
if len(path) == 0 {
return source
@ -691,7 +724,7 @@ func (v *Viper) searchMap(source map[string]interface{}, path []string) interfac
// This should be useful only at config level (other maps may not contain dots
// in their keys).
//
// Note: This assumes that the path entries and map keys are lower cased.
// Note: This assumes that the path entries and map keys are lower cased (normalized).
func (v *Viper) searchIndexableWithPathPrefixes(source interface{}, path []string) interface{} {
if len(path) == 0 {
return source
@ -699,7 +732,7 @@ func (v *Viper) searchIndexableWithPathPrefixes(source interface{}, path []strin
// search for path prefixes, starting from the longest one
for i := len(path); i > 0; i-- {
prefixKey := strings.ToLower(strings.Join(path[0:i], v.keyDelim))
prefixKey := v.keyNormalize(strings.Join(path[0:i], v.keyDelim))
var val interface{}
switch sourceIndexable := source.(type) {
@ -890,7 +923,7 @@ func GetViper() *Viper {
func Get(key string) interface{} { return v.Get(key) }
func (v *Viper) Get(key string) interface{} {
lcaseKey := strings.ToLower(key)
lcaseKey := v.keyNormalize(key)
val := v.find(lcaseKey, true)
if val == nil {
return nil
@ -950,7 +983,7 @@ func (v *Viper) Sub(key string) *Viper {
}
if reflect.TypeOf(data).Kind() == reflect.Map {
subv.parents = append(v.parents, strings.ToLower(key))
subv.parents = append(v.parents, v.keyNormalize(key))
subv.automaticEnvApplied = v.automaticEnvApplied
subv.envPrefix = v.envPrefix
subv.envKeyReplacer = v.envKeyReplacer
@ -1189,7 +1222,7 @@ func (v *Viper) BindFlagValue(key string, flag FlagValue) error {
if flag == nil {
return fmt.Errorf("flag for %q is nil", key)
}
v.pflags[strings.ToLower(key)] = flag
v.pflags[v.keyNormalize(key)] = flag
return nil
}
@ -1206,7 +1239,7 @@ func (v *Viper) BindEnv(input ...string) error {
return fmt.Errorf("missing key to bind to")
}
key := strings.ToLower(input[0])
key := v.keyNormalize(input[0])
if len(input) == 1 {
v.env[key] = append(v.env[key], v.mergeWithEnvPrefix(key))
@ -1236,7 +1269,7 @@ func (v *Viper) MustBindEnv(input ...string) {
// Lastly, if no value was found and flagDefault is true, and if the key
// corresponds to a flag, the flag's default value is returned.
//
// Note: this assumes a lower-cased key given.
// Note: this assumes a normalized key given.
func (v *Viper) find(lcaseKey string, flagDefault bool) interface{} {
var (
val interface{}
@ -1419,12 +1452,12 @@ func stringToStringConv(val string) interface{} {
}
// IsSet checks to see if the key has been set in any of the data locations.
// IsSet is case-insensitive for a key.
// IsSet normalizes the key.
func IsSet(key string) bool { return v.IsSet(key) }
func (v *Viper) IsSet(key string) bool {
lcaseKey := strings.ToLower(key)
val := v.find(lcaseKey, false)
normKey := v.keyNormalize(key)
val := v.find(normKey, false)
return val != nil
}
@ -1450,11 +1483,11 @@ func (v *Viper) SetEnvKeyReplacer(r *strings.Replacer) {
func RegisterAlias(alias string, key string) { v.RegisterAlias(alias, key) }
func (v *Viper) RegisterAlias(alias string, key string) {
v.registerAlias(alias, strings.ToLower(key))
v.registerAlias(alias, v.keyNormalize(key))
}
func (v *Viper) registerAlias(alias string, key string) {
alias = strings.ToLower(alias)
alias = v.keyNormalize(alias)
if alias != key && alias != v.realKey(key) {
_, exists := v.aliases[alias]
@ -1499,7 +1532,7 @@ func (v *Viper) realKey(key string) string {
func InConfig(key string) bool { return v.InConfig(key) }
func (v *Viper) InConfig(key string) bool {
lcaseKey := strings.ToLower(key)
lcaseKey := v.keyNormalize(key)
// if the requested key is an alias, then return the proper key
lcaseKey = v.realKey(lcaseKey)
@ -1509,17 +1542,18 @@ func (v *Viper) InConfig(key string) bool {
}
// SetDefault sets the default value for this key.
// SetDefault is case-insensitive for a key.
// SetDefault applies normalization (by default, lowercases) a key.
// Default only used when no value is provided by the user via flag, config or ENV.
func SetDefault(key string, value interface{}) { v.SetDefault(key, value) }
func (v *Viper) SetDefault(key string, value interface{}) {
// If alias passed in, then set the proper default
key = v.realKey(strings.ToLower(key))
value = toCaseInsensitiveValue(value)
key = v.keyNormalize(key)
value = toCaseInsensitiveValue(value, v.keyNormalize)
key = v.realKey(key)
path := strings.Split(key, v.keyDelim)
lastKey := strings.ToLower(path[len(path)-1])
lastKey := v.keyNormalize(path[len(path)-1])
deepestMap := deepSearch(v.defaults, path[0:len(path)-1])
// set innermost value
@ -1527,18 +1561,19 @@ func (v *Viper) SetDefault(key string, value interface{}) {
}
// Set sets the value for the key in the override register.
// Set is case-insensitive for a key.
// Set normalizes a key.
// Will be used instead of values obtained via
// flags, config file, ENV, default, or key/value store.
func Set(key string, value interface{}) { v.Set(key, value) }
func (v *Viper) Set(key string, value interface{}) {
// If alias passed in, then set the proper override
key = v.realKey(strings.ToLower(key))
value = toCaseInsensitiveValue(value)
key = v.keyNormalize(key)
value = toCaseInsensitiveValue(value, v.keyNormalize)
key = v.realKey(key)
path := strings.Split(key, v.keyDelim)
lastKey := strings.ToLower(path[len(path)-1])
lastKey := v.keyNormalize(path[len(path)-1])
deepestMap := deepSearch(v.override, path[0:len(path)-1])
// set innermost value
@ -1627,7 +1662,7 @@ func (v *Viper) MergeConfigMap(cfg map[string]interface{}) error {
if v.config == nil {
v.config = make(map[string]interface{})
}
insensitiviseMap(cfg)
insensitiviseMap(cfg, v.keyNormalize)
mergeMaps(cfg, v.config, nil)
return nil
}
@ -1727,7 +1762,8 @@ func (v *Viper) unmarshalReader(in io.Reader, c map[string]interface{}) error {
}
}
insensitiviseMap(c)
insensitiviseMap(c, v.keyNormalize)
return nil
}
@ -1750,9 +1786,9 @@ func (v *Viper) marshalWriter(f afero.File, configType string) error {
}
func keyExists(k string, m map[string]interface{}) string {
lk := strings.ToLower(k)
lk := v.keyNormalize(k)
for mk := range m {
lmk := strings.ToLower(mk)
lmk := v.keyNormalize(mk)
if lmk == lk {
return mk
}
@ -2031,7 +2067,7 @@ func (v *Viper) flattenAndMergeMap(shadow map[string]bool, m map[string]interfac
m2 = cast.ToStringMap(val)
default:
// immediate value
shadow[strings.ToLower(fullKey)] = true
shadow[v.keyNormalize(fullKey)] = true
continue
}
// recursively merge to shadow map
@ -2057,7 +2093,7 @@ outer:
}
}
// add key
shadow[strings.ToLower(k)] = true
shadow[v.keyNormalize(k)] = true
}
return shadow
}
@ -2076,7 +2112,7 @@ func (v *Viper) AllSettings() map[string]interface{} {
continue
}
path := strings.Split(k, v.keyDelim)
lastKey := strings.ToLower(path[len(path)-1])
lastKey := v.keyNormalize(path[len(path)-1])
deepestMap := deepSearch(m, path[0:len(path)-1])
// set innermost value
deepestMap[lastKey] = value

70
viper_test.go
View file

@ -2334,6 +2334,76 @@ func TestCaseInsensitiveSet(t *testing.T) {
}
}
func TestCaseSensitive(t *testing.T) {
for _, config := range []struct {
typ string
content string
}{
{"yaml", `
aBcD: 1
eF:
gH: 2
iJk: 3
Lm:
nO: 4
P:
Q: 5
R: 6
`},
{"json", `{
"aBcD": 1,
"eF": {
"iJk": 3,
"Lm": {
"P": {
"Q": 5,
"R": 6
},
"nO": 4
},
"gH": 2
}
}`},
{"toml", `aBcD = 1
[eF]
gH = 2
iJk = 3
[eF.Lm]
nO = 4
[eF.Lm.P]
Q = 5
R = 6
`},
} {
doTestCaseSensitive(t, config.typ, config.content)
}
}
func doTestCaseSensitive(t *testing.T, typ, config string) {
// Create case-sensitive instance
v := NewWithOptions(KeyPreserveCase())
v.SetConfigType(typ)
r := strings.NewReader(config)
if err := v.unmarshalReader(r, v.config); err != nil {
panic(err)
}
v.Set("RfD", true)
assert.Equal(t, nil, v.Get("rfd"))
assert.Equal(t, true, v.Get("RfD"))
assert.Equal(t, 0, cast.ToInt(v.Get("abcd")))
assert.Equal(t, 1, cast.ToInt(v.Get("aBcD")))
assert.Equal(t, 0, cast.ToInt(v.Get("ef.gh")))
assert.Equal(t, 2, cast.ToInt(v.Get("eF.gH")))
assert.Equal(t, 0, cast.ToInt(v.Get("ef.ijk")))
assert.Equal(t, 3, cast.ToInt(v.Get("eF.iJk")))
assert.Equal(t, 0, cast.ToInt(v.Get("ef.lm.no")))
assert.Equal(t, 4, cast.ToInt(v.Get("eF.Lm.nO")))
assert.Equal(t, 0, cast.ToInt(v.Get("ef.lm.p.q")))
assert.Equal(t, 5, cast.ToInt(v.Get("eF.Lm.P.Q")))
}
func TestParseNested(t *testing.T) {
type duration struct {
Delay time.Duration