753 lines
17 KiB
Go
753 lines
17 KiB
Go
package form
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import (
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"fmt"
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"log"
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"net/url"
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"reflect"
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"strconv"
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"time"
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)
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const (
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errArraySize = "Array size of '%d' is larger than the maximum currently set on the decoder of '%d'. To increase this limit please see, SetMaxArraySize(size uint)"
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errMissingStartBracket = "Invalid formatting for key '%s' missing '[' bracket"
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errMissingEndBracket = "Invalid formatting for key '%s' missing ']' bracket"
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)
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type decoder struct {
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d *Decoder
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errs DecodeErrors
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dm dataMap
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values url.Values
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maxKeyLen int
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namespace []byte
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}
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func (d *decoder) setError(namespace []byte, err error) {
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if d.errs == nil {
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d.errs = make(DecodeErrors)
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}
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d.errs[string(namespace)] = err
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}
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func (d *decoder) findAlias(ns string) *recursiveData {
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for i := 0; i < len(d.dm); i++ {
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if d.dm[i].alias == ns {
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return d.dm[i]
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}
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}
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return nil
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}
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func (d *decoder) parseMapData() {
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// already parsed
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if len(d.dm) > 0 {
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return
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}
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d.maxKeyLen = 0
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d.dm = d.dm[0:0]
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var i int
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var idx int
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var l int
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var insideBracket bool
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var rd *recursiveData
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var isNum bool
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for k := range d.values {
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if len(k) > d.maxKeyLen {
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d.maxKeyLen = len(k)
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}
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for i = 0; i < len(k); i++ {
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switch k[i] {
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case '[':
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idx = i
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insideBracket = true
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isNum = true
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case ']':
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if !insideBracket {
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log.Panicf(errMissingStartBracket, k)
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}
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if rd = d.findAlias(k[:idx]); rd == nil {
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l = len(d.dm) + 1
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if l > cap(d.dm) {
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dm := make(dataMap, l)
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copy(dm, d.dm)
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rd = new(recursiveData)
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dm[len(d.dm)] = rd
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d.dm = dm
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} else {
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l = len(d.dm)
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d.dm = d.dm[:l+1]
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rd = d.dm[l]
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rd.sliceLen = 0
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rd.keys = rd.keys[0:0]
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}
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rd.alias = k[:idx]
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}
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// is map + key
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ke := key{
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ivalue: -1,
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value: k[idx+1 : i],
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searchValue: k[idx : i+1],
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}
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// is key is number, most likely array key, keep track of just in case an array/slice.
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if isNum {
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// no need to check for error, it will always pass
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// as we have done the checking to ensure
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// the value is a number ahead of time.
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var err error
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ke.ivalue, err = strconv.Atoi(ke.value)
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if err != nil {
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ke.ivalue = -1
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}
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if ke.ivalue > rd.sliceLen {
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rd.sliceLen = ke.ivalue
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}
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}
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rd.keys = append(rd.keys, ke)
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insideBracket = false
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default:
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// checking if not a number, 0-9 is 48-57 in byte, see for yourself fmt.Println('0', '1', '2', '3', '4', '5', '6', '7', '8', '9')
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if insideBracket && (k[i] > 57 || k[i] < 48) {
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isNum = false
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}
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}
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}
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// if still inside bracket, that means no ending bracket was ever specified
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if insideBracket {
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log.Panicf(errMissingEndBracket, k)
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}
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}
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}
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func (d *decoder) traverseStruct(v reflect.Value, typ reflect.Type, namespace []byte) (set bool) {
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l := len(namespace)
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first := l == 0
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// anonymous structs will still work for caching as the whole definition is stored
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// including tags
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s, ok := d.d.structCache.Get(typ)
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if !ok {
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s = d.d.structCache.parseStruct(d.d.mode, v, typ, d.d.tagName)
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}
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for _, f := range s.fields {
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namespace = namespace[:l]
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if f.isAnonymous {
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if d.setFieldByType(v.Field(f.idx), namespace, 0) {
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set = true
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}
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}
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if first {
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namespace = append(namespace, f.name...)
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} else {
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namespace = append(namespace, d.d.namespacePrefix...)
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namespace = append(namespace, f.name...)
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namespace = append(namespace, d.d.namespaceSuffix...)
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}
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if d.setFieldByType(v.Field(f.idx), namespace, 0) {
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set = true
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}
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}
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return
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}
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func (d *decoder) setFieldByType(current reflect.Value, namespace []byte, idx int) (set bool) {
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var err error
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v, kind := ExtractType(current)
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arr, ok := d.values[string(namespace)]
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if d.d.customTypeFuncs != nil {
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if ok {
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if cf, ok := d.d.customTypeFuncs[v.Type()]; ok {
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val, err := cf(arr[idx:])
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if err != nil {
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d.setError(namespace, err)
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return
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}
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v.Set(reflect.ValueOf(val))
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set = true
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return
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}
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}
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}
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switch kind {
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case reflect.Interface:
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if !ok || idx == len(arr) {
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return
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}
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v.Set(reflect.ValueOf(arr[idx]))
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set = true
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case reflect.Ptr:
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newVal := reflect.New(v.Type().Elem())
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if set = d.setFieldByType(newVal.Elem(), namespace, idx); set {
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v.Set(newVal)
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}
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case reflect.String:
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if !ok || idx == len(arr) {
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return
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}
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v.SetString(arr[idx])
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set = true
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case reflect.Uint, reflect.Uint64:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var u64 uint64
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if u64, err = strconv.ParseUint(arr[idx], 10, 64); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetUint(u64)
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set = true
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case reflect.Uint8:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var u64 uint64
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if u64, err = strconv.ParseUint(arr[idx], 10, 8); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetUint(u64)
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set = true
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case reflect.Uint16:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var u64 uint64
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if u64, err = strconv.ParseUint(arr[idx], 10, 16); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetUint(u64)
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set = true
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case reflect.Uint32:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var u64 uint64
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if u64, err = strconv.ParseUint(arr[idx], 10, 32); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetUint(u64)
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set = true
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case reflect.Int, reflect.Int64:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var i64 int64
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if i64, err = strconv.ParseInt(arr[idx], 10, 64); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetInt(i64)
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set = true
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case reflect.Int8:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var i64 int64
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if i64, err = strconv.ParseInt(arr[idx], 10, 8); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetInt(i64)
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set = true
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case reflect.Int16:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var i64 int64
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if i64, err = strconv.ParseInt(arr[idx], 10, 16); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetInt(i64)
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set = true
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case reflect.Int32:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var i64 int64
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if i64, err = strconv.ParseInt(arr[idx], 10, 32); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetInt(i64)
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set = true
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case reflect.Float32:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var f float64
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if f, err = strconv.ParseFloat(arr[idx], 32); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Float Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetFloat(f)
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set = true
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case reflect.Float64:
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if !ok || idx == len(arr) || len(arr[idx]) == 0 {
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return
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}
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var f float64
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if f, err = strconv.ParseFloat(arr[idx], 64); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Float Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetFloat(f)
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set = true
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case reflect.Bool:
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if !ok || idx == len(arr) {
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return
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}
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var b bool
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if b, err = parseBool(arr[idx]); err != nil {
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d.setError(namespace, fmt.Errorf("Invalid Boolean Value '%s' Type '%v' Namespace '%s'", arr[idx], v.Type(), string(namespace)))
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return
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}
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v.SetBool(b)
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set = true
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case reflect.Slice:
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d.parseMapData()
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// slice elements could be mixed eg. number and non-numbers Value[0]=[]string{"10"} and Value=[]string{"10","20"}
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if ok && len(arr) > 0 {
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var varr reflect.Value
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var ol int
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l := len(arr)
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if v.IsNil() {
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varr = reflect.MakeSlice(v.Type(), len(arr), len(arr))
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} else {
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ol = v.Len()
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l += ol
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if v.Cap() <= l {
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varr = reflect.MakeSlice(v.Type(), l, l)
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} else {
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// preserve predefined capacity, possibly for reuse after decoding
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varr = reflect.MakeSlice(v.Type(), l, v.Cap())
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}
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reflect.Copy(varr, v)
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}
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for i := ol; i < l; i++ {
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newVal := reflect.New(v.Type().Elem()).Elem()
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if d.setFieldByType(newVal, namespace, i-ol) {
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set = true
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varr.Index(i).Set(newVal)
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}
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}
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v.Set(varr)
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}
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// maybe it's an numbered array i.e. Phone[0].Number
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if rd := d.findAlias(string(namespace)); rd != nil {
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var varr reflect.Value
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var kv key
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sl := rd.sliceLen + 1
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// checking below for maxArraySize, but if array exists and already
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// has sufficient capacity allocated then we do not check as the code
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// obviously allows a capacity greater than the maxArraySize.
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if v.IsNil() {
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if sl > d.d.maxArraySize {
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d.setError(namespace, fmt.Errorf(errArraySize, sl, d.d.maxArraySize))
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return
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}
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varr = reflect.MakeSlice(v.Type(), sl, sl)
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} else if v.Len() < sl {
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if v.Cap() <= sl {
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if sl > d.d.maxArraySize {
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d.setError(namespace, fmt.Errorf(errArraySize, sl, d.d.maxArraySize))
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return
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}
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varr = reflect.MakeSlice(v.Type(), sl, sl)
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} else {
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varr = reflect.MakeSlice(v.Type(), sl, v.Cap())
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}
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reflect.Copy(varr, v)
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} else {
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varr = v
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}
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for i := 0; i < len(rd.keys); i++ {
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kv = rd.keys[i]
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newVal := reflect.New(varr.Type().Elem()).Elem()
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if kv.ivalue == -1 {
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d.setError(namespace, fmt.Errorf("invalid slice index '%s'", kv.value))
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continue
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}
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if d.setFieldByType(newVal, append(namespace, kv.searchValue...), 0) {
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set = true
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varr.Index(kv.ivalue).Set(newVal)
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}
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}
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if !set {
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return
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}
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v.Set(varr)
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}
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case reflect.Array:
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d.parseMapData()
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// array elements could be mixed eg. number and non-numbers Value[0]=[]string{"10"} and Value=[]string{"10","20"}
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if ok && len(arr) > 0 {
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var varr reflect.Value
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l := len(arr)
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overCapacity := v.Len() < l
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if overCapacity {
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// more values than array capacity, ignore values over capacity as it's possible some would just want
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// to grab the first x number of elements; in the future strict mode logic should return an error
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fmt.Println("warning number of post form array values is larger than array capacity, ignoring overflow values")
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}
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varr = reflect.Indirect(reflect.New(reflect.ArrayOf(v.Len(), v.Type().Elem())))
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reflect.Copy(varr, v)
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if v.Len() < len(arr) {
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l = v.Len()
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}
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for i := 0; i < l; i++ {
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newVal := reflect.New(v.Type().Elem()).Elem()
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if d.setFieldByType(newVal, namespace, i) {
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set = true
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varr.Index(i).Set(newVal)
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}
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}
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v.Set(varr)
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}
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// maybe it's an numbered array i.e. Phone[0].Number
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if rd := d.findAlias(string(namespace)); rd != nil {
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var varr reflect.Value
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var kv key
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overCapacity := rd.sliceLen >= v.Len()
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if overCapacity {
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// more values than array capacity, ignore values over capacity as it's possible some would just want
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// to grab the first x number of elements; in the future strict mode logic should return an error
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fmt.Println("warning number of post form array values is larger than array capacity, ignoring overflow values")
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}
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varr = reflect.Indirect(reflect.New(reflect.ArrayOf(v.Len(), v.Type().Elem())))
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reflect.Copy(varr, v)
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for i := 0; i < len(rd.keys); i++ {
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kv = rd.keys[i]
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if kv.ivalue >= v.Len() {
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continue
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}
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newVal := reflect.New(varr.Type().Elem()).Elem()
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if kv.ivalue == -1 {
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d.setError(namespace, fmt.Errorf("invalid array index '%s'", kv.value))
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continue
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}
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if d.setFieldByType(newVal, append(namespace, kv.searchValue...), 0) {
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set = true
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varr.Index(kv.ivalue).Set(newVal)
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}
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}
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if !set {
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return
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}
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v.Set(varr)
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}
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case reflect.Map:
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var rd *recursiveData
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d.parseMapData()
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// no natural map support so skip directly to dm lookup
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if rd = d.findAlias(string(namespace)); rd == nil {
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return
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}
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var existing bool
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var kv key
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var mp reflect.Value
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var mk reflect.Value
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typ := v.Type()
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if v.IsNil() {
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mp = reflect.MakeMap(typ)
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} else {
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existing = true
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mp = v
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}
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for i := 0; i < len(rd.keys); i++ {
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newVal := reflect.New(typ.Elem()).Elem()
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mk = reflect.New(typ.Key()).Elem()
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kv = rd.keys[i]
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if err := d.getMapKey(kv.value, mk, namespace); err != nil {
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d.setError(namespace, err)
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continue
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}
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if d.setFieldByType(newVal, append(namespace, kv.searchValue...), 0) {
|
|
set = true
|
|
mp.SetMapIndex(mk, newVal)
|
|
}
|
|
}
|
|
|
|
if !set || existing {
|
|
return
|
|
}
|
|
|
|
v.Set(mp)
|
|
|
|
case reflect.Struct:
|
|
typ := v.Type()
|
|
|
|
// if we get here then no custom time function declared so use RFC3339 by default
|
|
if typ == timeType {
|
|
|
|
if !ok || len(arr[idx]) == 0 {
|
|
return
|
|
}
|
|
|
|
t, err := time.Parse(time.RFC3339, arr[idx])
|
|
if err != nil {
|
|
d.setError(namespace, err)
|
|
}
|
|
|
|
v.Set(reflect.ValueOf(t))
|
|
set = true
|
|
return
|
|
}
|
|
|
|
d.parseMapData()
|
|
|
|
// we must be recursing infinitly...but that's ok we caught it on the very first overun.
|
|
if len(namespace) > d.maxKeyLen {
|
|
return
|
|
}
|
|
|
|
set = d.traverseStruct(v, typ, namespace)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *decoder) getMapKey(key string, current reflect.Value, namespace []byte) (err error) {
|
|
|
|
v, kind := ExtractType(current)
|
|
|
|
if d.d.customTypeFuncs != nil {
|
|
if cf, ok := d.d.customTypeFuncs[v.Type()]; ok {
|
|
|
|
val, er := cf([]string{key})
|
|
if er != nil {
|
|
err = er
|
|
return
|
|
}
|
|
|
|
v.Set(reflect.ValueOf(val))
|
|
return
|
|
}
|
|
}
|
|
|
|
switch kind {
|
|
case reflect.Interface:
|
|
// If interface would have been set on the struct before decoding,
|
|
// say to a struct value we would not get here but kind would be struct.
|
|
v.Set(reflect.ValueOf(key))
|
|
return
|
|
case reflect.Ptr:
|
|
newVal := reflect.New(v.Type().Elem())
|
|
if err = d.getMapKey(key, newVal.Elem(), namespace); err == nil {
|
|
v.Set(newVal)
|
|
}
|
|
|
|
case reflect.String:
|
|
v.SetString(key)
|
|
|
|
case reflect.Uint, reflect.Uint64:
|
|
|
|
u64, e := strconv.ParseUint(key, 10, 64)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetUint(u64)
|
|
|
|
case reflect.Uint8:
|
|
|
|
u64, e := strconv.ParseUint(key, 10, 8)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetUint(u64)
|
|
|
|
case reflect.Uint16:
|
|
|
|
u64, e := strconv.ParseUint(key, 10, 16)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetUint(u64)
|
|
|
|
case reflect.Uint32:
|
|
|
|
u64, e := strconv.ParseUint(key, 10, 32)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Unsigned Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetUint(u64)
|
|
|
|
case reflect.Int, reflect.Int64:
|
|
|
|
i64, e := strconv.ParseInt(key, 10, 64)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetInt(i64)
|
|
|
|
case reflect.Int8:
|
|
|
|
i64, e := strconv.ParseInt(key, 10, 8)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetInt(i64)
|
|
|
|
case reflect.Int16:
|
|
|
|
i64, e := strconv.ParseInt(key, 10, 16)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetInt(i64)
|
|
|
|
case reflect.Int32:
|
|
|
|
i64, e := strconv.ParseInt(key, 10, 32)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Integer Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetInt(i64)
|
|
|
|
case reflect.Float32:
|
|
|
|
f, e := strconv.ParseFloat(key, 32)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Float Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetFloat(f)
|
|
|
|
case reflect.Float64:
|
|
|
|
f, e := strconv.ParseFloat(key, 64)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Float Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetFloat(f)
|
|
|
|
case reflect.Bool:
|
|
|
|
b, e := parseBool(key)
|
|
if e != nil {
|
|
err = fmt.Errorf("Invalid Boolean Value '%s' Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
return
|
|
}
|
|
|
|
v.SetBool(b)
|
|
|
|
default:
|
|
err = fmt.Errorf("Unsupported Map Key '%s', Type '%v' Namespace '%s'", key, v.Type(), string(namespace))
|
|
}
|
|
|
|
return
|
|
}
|