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|
package api
import (
"fmt"
"strconv"
"strings"
)
const (
keyStart = '['
keyEnd = ']'
keySeparator = '='
)
func parseFields(opts *ApiOptions) (map[string]interface{}, error) {
params := make(map[string]interface{})
parseField := func(f string, isMagic bool) error {
var valueIndex int
var keystack []string
keyStartAt := 0
parseLoop:
for i, r := range f {
switch r {
case keyStart:
if keyStartAt == 0 {
keystack = append(keystack, f[0:i])
}
keyStartAt = i + 1
case keyEnd:
keystack = append(keystack, f[keyStartAt:i])
case keySeparator:
if keyStartAt == 0 {
keystack = append(keystack, f[0:i])
}
valueIndex = i + 1
break parseLoop
}
}
if len(keystack) == 0 {
return fmt.Errorf("invalid key: %q", f)
}
key := f
var value interface{} = nil
if valueIndex == 0 {
if keystack[len(keystack)-1] != "" {
return fmt.Errorf("field %q requires a value separated by an '=' sign", key)
}
} else {
key = f[0 : valueIndex-1]
value = f[valueIndex:]
}
if isMagic && value != nil {
var err error
value, err = magicFieldValue(value.(string), opts)
if err != nil {
return fmt.Errorf("error parsing %q value: %w", key, err)
}
}
destMap := params
isArray := false
var subkey string
for _, k := range keystack {
if k == "" {
isArray = true
continue
}
if subkey != "" {
var err error
if isArray {
destMap, err = addParamsSlice(destMap, subkey, k)
isArray = false
} else {
destMap, err = addParamsMap(destMap, subkey)
}
if err != nil {
return err
}
}
subkey = k
}
if isArray {
if value == nil {
destMap[subkey] = []interface{}{}
} else {
if v, exists := destMap[subkey]; exists {
if existSlice, ok := v.([]interface{}); ok {
destMap[subkey] = append(existSlice, value)
} else {
return fmt.Errorf("expected array type under %q, got %T", subkey, v)
}
} else {
destMap[subkey] = []interface{}{value}
}
}
} else {
destMap[subkey] = value
}
return nil
}
for _, f := range opts.RawFields {
if err := parseField(f, false); err != nil {
return params, err
}
}
for _, f := range opts.MagicFields {
if err := parseField(f, true); err != nil {
return params, err
}
}
return params, nil
}
func addParamsMap(m map[string]interface{}, key string) (map[string]interface{}, error) {
if v, exists := m[key]; exists {
if existMap, ok := v.(map[string]interface{}); ok {
return existMap, nil
} else {
return nil, fmt.Errorf("expected map type under %q, got %T", key, v)
}
}
newMap := make(map[string]interface{})
m[key] = newMap
return newMap, nil
}
func addParamsSlice(m map[string]interface{}, prevkey, newkey string) (map[string]interface{}, error) {
if v, exists := m[prevkey]; exists {
if existSlice, ok := v.([]interface{}); ok {
if len(existSlice) > 0 {
lastItem := existSlice[len(existSlice)-1]
if lastMap, ok := lastItem.(map[string]interface{}); ok {
if _, keyExists := lastMap[newkey]; !keyExists {
return lastMap, nil
}
}
}
newMap := make(map[string]interface{})
m[prevkey] = append(existSlice, newMap)
return newMap, nil
} else {
return nil, fmt.Errorf("expected array type under %q, got %T", prevkey, v)
}
}
newMap := make(map[string]interface{})
m[prevkey] = []interface{}{newMap}
return newMap, nil
}
func magicFieldValue(v string, opts *ApiOptions) (interface{}, error) {
if strings.HasPrefix(v, "@") {
b, err := opts.IO.ReadUserFile(v[1:])
if err != nil {
return "", err
}
return string(b), nil
}
if n, err := strconv.Atoi(v); err == nil {
return n, nil
}
switch v {
case "true":
return true, nil
case "false":
return false, nil
case "null":
return nil, nil
default:
return fillPlaceholders(v, opts)
}
}
|
