336 lines
8.8 KiB
Go
336 lines
8.8 KiB
Go
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package gofakeit
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"math/rand"
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"reflect"
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"strconv"
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)
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// JSONOptions defines values needed for json generation
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type JSONOptions struct {
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Type string `json:"type" xml:"type" fake:"{randomstring:[array,object]}"` // array or object
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RowCount int `json:"row_count" xml:"row_count" fake:"{number:1,10}"`
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Indent bool `json:"indent" xml:"indent"`
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Fields []Field `json:"fields" xml:"fields" fake:"{fields}"`
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}
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type jsonKeyVal struct {
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Key string
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Value any
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}
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type jsonOrderedKeyVal []*jsonKeyVal
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func (okv jsonOrderedKeyVal) MarshalJSON() ([]byte, error) {
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var buf bytes.Buffer
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buf.WriteString("{")
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for i, kv := range okv {
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// Add comma to all except last one
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if i != 0 {
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buf.WriteString(",")
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}
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// Marshal key and write
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key, err := json.Marshal(kv.Key)
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if err != nil {
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return nil, err
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}
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buf.Write(key)
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// Write colon separator
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buf.WriteString(":")
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// Marshal value and write
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val, err := json.Marshal(kv.Value)
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if err != nil {
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return nil, err
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}
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buf.Write(val)
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}
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buf.WriteString("}")
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return buf.Bytes(), nil
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}
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// JSON generates an object or an array of objects in json format.
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// A nil JSONOptions returns a randomly structured JSON.
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func JSON(jo *JSONOptions) ([]byte, error) { return jsonFunc(globalFaker, jo) }
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// JSON generates an object or an array of objects in json format.
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// A nil JSONOptions returns a randomly structured JSON.
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func (f *Faker) JSON(jo *JSONOptions) ([]byte, error) { return jsonFunc(f, jo) }
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// JSON generates an object or an array of objects in json format
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func jsonFunc(f *Faker, jo *JSONOptions) ([]byte, error) {
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if jo == nil {
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// We didn't get a JSONOptions, so create a new random one
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err := f.Struct(&jo)
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if err != nil {
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return nil, err
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}
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}
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// Check to make sure they passed in a type
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if jo.Type != "array" && jo.Type != "object" {
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return nil, errors.New("invalid type, must be array or object")
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}
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if jo.Fields == nil || len(jo.Fields) <= 0 {
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return nil, errors.New("must pass fields in order to build json object(s)")
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}
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if jo.Type == "object" {
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v := make(jsonOrderedKeyVal, len(jo.Fields))
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// Loop through fields and add to them to map[string]any
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for i, field := range jo.Fields {
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if field.Function == "autoincrement" {
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// Object only has one
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v[i] = &jsonKeyVal{Key: field.Name, Value: 1}
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continue
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}
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// Get function info
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funcInfo := GetFuncLookup(field.Function)
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if funcInfo == nil {
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return nil, errors.New("invalid function, " + field.Function + " does not exist")
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}
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// Call function value
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value, err := funcInfo.Generate(f.Rand, &field.Params, funcInfo)
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if err != nil {
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return nil, err
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}
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if _, ok := value.([]byte); ok {
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// If it's a slice, unmarshal it into an interface
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var val any
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err := json.Unmarshal(value.([]byte), &val)
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if err != nil {
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return nil, err
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}
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value = val
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}
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v[i] = &jsonKeyVal{Key: field.Name, Value: value}
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}
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// Marshal into bytes
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if jo.Indent {
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j, _ := json.MarshalIndent(v, "", " ")
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return j, nil
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}
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j, _ := json.Marshal(v)
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return j, nil
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}
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if jo.Type == "array" {
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// Make sure you set a row count
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if jo.RowCount <= 0 {
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return nil, errors.New("must have row count")
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}
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v := make([]jsonOrderedKeyVal, jo.RowCount)
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for i := 0; i < int(jo.RowCount); i++ {
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vr := make(jsonOrderedKeyVal, len(jo.Fields))
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// Loop through fields and add to them to map[string]any
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for ii, field := range jo.Fields {
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if field.Function == "autoincrement" {
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vr[ii] = &jsonKeyVal{Key: field.Name, Value: i + 1} // +1 because index starts with 0
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continue
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}
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// Get function info
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funcInfo := GetFuncLookup(field.Function)
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if funcInfo == nil {
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return nil, errors.New("invalid function, " + field.Function + " does not exist")
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}
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// Call function value
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value, err := funcInfo.Generate(f.Rand, &field.Params, funcInfo)
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if err != nil {
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return nil, err
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}
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if _, ok := value.([]byte); ok {
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// If it's a slice, unmarshal it into an interface
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var val any
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err := json.Unmarshal(value.([]byte), &val)
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if err != nil {
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return nil, err
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}
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value = val
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}
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vr[ii] = &jsonKeyVal{Key: field.Name, Value: value}
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}
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v[i] = vr
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}
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// Marshal into bytes
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if jo.Indent {
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j, _ := json.MarshalIndent(v, "", " ")
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return j, nil
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}
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j, _ := json.Marshal(v)
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return j, nil
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}
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return nil, errors.New("invalid type, must be array or object")
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}
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func addFileJSONLookup() {
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AddFuncLookup("json", Info{
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Display: "JSON",
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Category: "file",
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Description: "Format for structured data interchange used in programming, returns an object or an array of objects",
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Example: `[
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{ "first_name": "Markus", "last_name": "Moen", "password": "Dc0VYXjkWABx" },
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{ "first_name": "Osborne", "last_name": "Hilll", "password": "XPJ9OVNbs5lm" },
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{ "first_name": "Mertie", "last_name": "Halvorson", "password": "eyl3bhwfV8wA" }
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]`,
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Output: "[]byte",
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ContentType: "application/json",
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Params: []Param{
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{Field: "type", Display: "Type", Type: "string", Default: "object", Options: []string{"object", "array"}, Description: "Type of JSON, object or array"},
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{Field: "rowcount", Display: "Row Count", Type: "int", Default: "100", Description: "Number of rows in JSON array"},
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{Field: "indent", Display: "Indent", Type: "bool", Default: "false", Description: "Whether or not to add indents and newlines"},
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{Field: "fields", Display: "Fields", Type: "[]Field", Description: "Fields containing key name and function to run in json format"},
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},
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Generate: func(r *rand.Rand, m *MapParams, info *Info) (any, error) {
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jo := JSONOptions{}
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typ, err := info.GetString(m, "type")
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if err != nil {
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return nil, err
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}
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jo.Type = typ
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rowcount, err := info.GetInt(m, "rowcount")
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if err != nil {
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return nil, err
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}
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jo.RowCount = rowcount
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indent, err := info.GetBool(m, "indent")
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if err != nil {
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return nil, err
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}
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jo.Indent = indent
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fieldsStr, err := info.GetStringArray(m, "fields")
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if err != nil {
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return nil, err
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}
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// Check to make sure fields has length
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if len(fieldsStr) > 0 {
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jo.Fields = make([]Field, len(fieldsStr))
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for i, f := range fieldsStr {
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// Unmarshal fields string into fields array
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err = json.Unmarshal([]byte(f), &jo.Fields[i])
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if err != nil {
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return nil, err
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}
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}
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}
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f := &Faker{Rand: r}
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return jsonFunc(f, &jo)
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},
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})
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}
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// encoding/json.RawMessage is a special case of []byte
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// it cannot be handled as a reflect.Array/reflect.Slice
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// because it needs additional structure in the output
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func rJsonRawMessage(f *Faker, t reflect.Type, v reflect.Value, tag string, size int) error {
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b, err := f.JSON(nil)
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if err != nil {
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return err
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}
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v.SetBytes(b)
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return nil
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}
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// encoding/json.Number is a special case of string
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// that represents a JSON number literal.
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// It cannot be handled as a string because it needs to
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// represent an integer or a floating-point number.
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func rJsonNumber(f *Faker, t reflect.Type, v reflect.Value, tag string, size int) error {
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var ret json.Number
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var numberType string
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if tag == "" {
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numberType = f.RandomString([]string{"int", "float"})
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switch numberType {
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case "int":
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retInt := f.Int16()
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ret = json.Number(strconv.Itoa(int(retInt)))
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case "float":
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retFloat := f.Float64()
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ret = json.Number(strconv.FormatFloat(retFloat, 'f', -1, 64))
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}
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} else {
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fName, fParams := parseNameAndParamsFromTag(tag)
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info := GetFuncLookup(fName)
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if info == nil {
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return fmt.Errorf("invalid function, %s does not exist", fName)
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}
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// Parse map params
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mapParams := parseMapParams(info, fParams)
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valueIface, err := info.Generate(f.Rand, mapParams, info)
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if err != nil {
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return err
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}
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switch value := valueIface.(type) {
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case int:
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ret = json.Number(strconv.FormatInt(int64(value), 10))
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case int8:
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ret = json.Number(strconv.FormatInt(int64(value), 10))
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case int16:
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ret = json.Number(strconv.FormatInt(int64(value), 10))
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case int32:
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ret = json.Number(strconv.FormatInt(int64(value), 10))
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case int64:
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ret = json.Number(strconv.FormatInt(int64(value), 10))
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case uint:
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ret = json.Number(strconv.FormatUint(uint64(value), 10))
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case uint8:
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ret = json.Number(strconv.FormatUint(uint64(value), 10))
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case uint16:
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ret = json.Number(strconv.FormatUint(uint64(value), 10))
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case uint32:
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ret = json.Number(strconv.FormatUint(uint64(value), 10))
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case uint64:
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ret = json.Number(strconv.FormatUint(uint64(value), 10))
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case float32:
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ret = json.Number(strconv.FormatFloat(float64(value), 'f', -1, 64))
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case float64:
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ret = json.Number(strconv.FormatFloat(float64(value), 'f', -1, 64))
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default:
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return fmt.Errorf("invalid type, %s is not a valid type for json.Number", reflect.TypeOf(value))
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}
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}
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v.Set(reflect.ValueOf(ret))
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return nil
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}
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