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package objx
import (
"encoding/base64"
"encoding/json"
"errors"
"io/ioutil"
"net/url"
"strings"
)
// MSIConvertable is an interface that defines methods for converting your
// custom types to a map[string]interface{} representation.
type MSIConvertable interface {
// MSI gets a map[string]interface{} (msi) representing the
// object.
MSI() map[string]interface{}
}
// Map provides extended functionality for working with
// untyped data, in particular map[string]interface (msi).
type Map map[string]interface{}
// Value returns the internal value instance
func (m Map) Value() *Value {
return &Value{data: m}
}
// Nil represents a nil Map.
var Nil Map = New(nil)
// New creates a new Map containing the map[string]interface{} in the data argument.
// If the data argument is not a map[string]interface, New attempts to call the
// MSI() method on the MSIConvertable interface to create one.
func New(data interface{}) Map {
if _, ok := data.(map[string]interface{}); !ok {
if converter, ok := data.(MSIConvertable); ok {
data = converter.MSI()
} else {
return nil
}
}
return Map(data.(map[string]interface{}))
}
// MSI creates a map[string]interface{} and puts it inside a new Map.
//
// The arguments follow a key, value pattern.
//
// Panics
//
// Panics if any key arugment is non-string or if there are an odd number of arguments.
//
// Example
//
// To easily create Maps:
//
// m := objx.MSI("name", "Mat", "age", 29, "subobj", objx.MSI("active", true))
//
// // creates an Map equivalent to
// m := objx.New(map[string]interface{}{"name": "Mat", "age": 29, "subobj": map[string]interface{}{"active": true}})
func MSI(keyAndValuePairs ...interface{}) Map {
newMap := make(map[string]interface{})
keyAndValuePairsLen := len(keyAndValuePairs)
if keyAndValuePairsLen%2 != 0 {
panic("objx: MSI must have an even number of arguments following the 'key, value' pattern.")
}
for i := 0; i < keyAndValuePairsLen; i = i + 2 {
key := keyAndValuePairs[i]
value := keyAndValuePairs[i+1]
// make sure the key is a string
keyString, keyStringOK := key.(string)
if !keyStringOK {
panic("objx: MSI must follow 'string, interface{}' pattern. " + keyString + " is not a valid key.")
}
newMap[keyString] = value
}
return New(newMap)
}
// ****** Conversion Constructors
// MustFromJSON creates a new Map containing the data specified in the
// jsonString.
//
// Panics if the JSON is invalid.
func MustFromJSON(jsonString string) Map {
o, err := FromJSON(jsonString)
if err != nil {
panic("objx: MustFromJSON failed with error: " + err.Error())
}
return o
}
// FromJSON creates a new Map containing the data specified in the
// jsonString.
//
// Returns an error if the JSON is invalid.
func FromJSON(jsonString string) (Map, error) {
var data interface{}
err := json.Unmarshal([]byte(jsonString), &data)
if err != nil {
return Nil, err
}
return New(data), nil
}
// FromBase64 creates a new Obj containing the data specified
// in the Base64 string.
//
// The string is an encoded JSON string returned by Base64
func FromBase64(base64String string) (Map, error) {
decoder := base64.NewDecoder(base64.StdEncoding, strings.NewReader(base64String))
decoded, err := ioutil.ReadAll(decoder)
if err != nil {
return nil, err
}
return FromJSON(string(decoded))
}
// MustFromBase64 creates a new Obj containing the data specified
// in the Base64 string and panics if there is an error.
//
// The string is an encoded JSON string returned by Base64
func MustFromBase64(base64String string) Map {
result, err := FromBase64(base64String)
if err != nil {
panic("objx: MustFromBase64 failed with error: " + err.Error())
}
return result
}
// FromSignedBase64 creates a new Obj containing the data specified
// in the Base64 string.
//
// The string is an encoded JSON string returned by SignedBase64
func FromSignedBase64(base64String, key string) (Map, error) {
parts := strings.Split(base64String, SignatureSeparator)
if len(parts) != 2 {
return nil, errors.New("objx: Signed base64 string is malformed.")
}
sig := HashWithKey(parts[0], key)
if parts[1] != sig {
return nil, errors.New("objx: Signature for base64 data does not match.")
}
return FromBase64(parts[0])
}
// MustFromSignedBase64 creates a new Obj containing the data specified
// in the Base64 string and panics if there is an error.
//
// The string is an encoded JSON string returned by Base64
func MustFromSignedBase64(base64String, key string) Map {
result, err := FromSignedBase64(base64String, key)
if err != nil {
panic("objx: MustFromSignedBase64 failed with error: " + err.Error())
}
return result
}
// FromURLQuery generates a new Obj by parsing the specified
// query.
//
// For queries with multiple values, the first value is selected.
func FromURLQuery(query string) (Map, error) {
vals, err := url.ParseQuery(query)
if err != nil {
return nil, err
}
m := make(map[string]interface{})
for k, vals := range vals {
m[k] = vals[0]
}
return New(m), nil
}
// MustFromURLQuery generates a new Obj by parsing the specified
// query.
//
// For queries with multiple values, the first value is selected.
//
// Panics if it encounters an error
func MustFromURLQuery(query string) Map {
o, err := FromURLQuery(query)
if err != nil {
panic("objx: MustFromURLQuery failed with error: " + err.Error())
}
return o
}
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