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rule.go
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rule.go
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package goformkeeper
import (
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"path/filepath"
yaml "gopkg.in/yaml.v1"
)
type Rule struct {
Fields map[string]*Field
Selections map[string]*Selection
Forms map[string]*Form
}
type Form struct {
Fields []*Field
Selections []*Selection
}
type Field struct {
Name string
Ref string
Required bool
Default string
Message string
Filters []string
Constraints []*Constraint
FallThrough bool
}
type Selection struct {
Name string
Ref string
Count *Count
Message string
Filters []string
Constraints []*Constraint
FallThrough bool
}
type Count struct {
From int
To int
}
func newRule() *Rule {
return &Rule{
Fields: make(map[string]*Field),
Selections: make(map[string]*Selection),
Forms: make(map[string]*Form),
}
}
func LoadRuleFromDir(dirPath string) (*Rule, error) {
r := newRule()
err := filepath.Walk(dirPath,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
rule, err := LoadRuleFromFile(path)
if err != nil {
return err
}
r.Merge(rule)
}
return nil
})
if err != nil {
return nil, err
}
return r, nil
}
func LoadRuleFromFile(filePath string) (*Rule, error) {
data, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, fmt.Errorf("Failed to read form-rule %s: %s", filePath, err.Error())
}
r := &Rule{}
err = yaml.Unmarshal(data, &r)
if err != nil {
return nil, fmt.Errorf("Failed to parse form-rule %s: %s", filePath, err.Error())
}
return r, nil
}
func (field *Field) GetFilterNames() []string {
return field.Filters
}
func (field *Field) mergeReferenceIfNeeded(rule *Rule) {
if field.Ref != "" {
ref, found := rule.Fields[field.Ref]
if found {
if field.Name == "" {
field.Name = ref.Name
}
if field.Message == "" {
field.Message = ref.Message
}
field.Required = ref.Required
field.Default = ref.Default
field.Constraints = ref.Constraints
field.Filters = ref.Filters
}
}
}
func (selection *Selection) GetFilterNames() []string {
return selection.Filters
}
func (selection *Selection) mergeReferenceIfNeeded(rule *Rule) {
if selection.Ref != "" {
ref, found := rule.Selections[selection.Ref]
if found {
if selection.Name == "" {
selection.Name = ref.Name
}
if selection.Message == "" {
selection.Message = ref.Message
}
selection.Count = ref.Count
selection.Constraints = ref.Constraints
selection.Filters = ref.Filters
}
}
}
func (r *Rule) Merge(r2 *Rule) {
for k, v := range r2.Fields {
r.Fields[k] = v
}
for k, v := range r2.Selections {
r.Selections[k] = v
}
for k, v := range r2.Forms {
r.Forms[k] = v
}
}
const defaultMaxMemory = 32 << 20
func (rule *Rule) Validate(formName string, req *http.Request) (*Result, error) {
form, found := rule.Forms[formName]
if !found {
return nil, fmt.Errorf("Form rule not found '%s'", formName)
}
// we need to pick multiple form values from r.Form
if req.Form == nil {
req.ParseMultipartForm(defaultMaxMemory)
}
result := NewResult()
for _, field := range form.Fields {
field.mergeReferenceIfNeeded(rule)
if field.Name == "" {
return nil, fmt.Errorf("Field name not found on a rule for '%s'", formName)
}
fv := req.FormValue(field.Name)
if fv == "" && field.Default != "" {
fv = field.Default
}
value, err := filter(field, fv)
if err != nil {
return nil, err
}
err = field.validate(result, value)
if err != nil {
return nil, err
}
}
for _, selection := range form.Selections {
selection.mergeReferenceIfNeeded(rule)
if selection.Name == "" {
return nil, errors.New("Selection name not found")
}
values := req.Form[selection.Name]
filteredValues := make([]string, 0)
for _, value := range values {
filteredValue, err := filter(selection, value)
if err != nil {
return nil, err
}
if filteredValue != "" {
filteredValues = append(filteredValues, filteredValue)
}
}
err := selection.validate(result, filteredValues)
if err != nil {
return nil, err
}
}
return result, nil
}
func (field *Field) validate(result *Result, value string) error {
if value == "" {
if field.Required {
result.putRequiredFailure(field.Name, field.Message)
} else {
result.ValidFields[field.Name] = ""
return nil
}
} else {
failure := NewFailureForField(field.Name, field.Message)
passAll := true
for _, constraint := range field.Constraints {
pass, err := validate(value, constraint)
if err != nil {
return err
}
if !pass {
passAll = false
failure.failOnConstraint(constraint.Type, constraint.Message)
if !field.FallThrough {
break
}
}
}
if passAll {
result.ValidFields[field.Name] = value
} else {
result.AddFailure(failure)
}
}
return nil
}
func (selection *Selection) validate(result *Result, values []string) error {
count := len(values)
if count >= selection.Count.From && count <= selection.Count.To {
if count == 0 {
result.ValidSelections[selection.Name] = []string{}
return nil
}
failure := NewFailureForSelection(selection.Name, selection.Message)
passAll := true
for _, value := range values {
for _, constraint := range selection.Constraints {
pass, err := validate(value, constraint)
if err != nil {
return err
}
if !pass {
passAll = false
failure.failOnConstraint(constraint.Type, constraint.Message)
break
}
}
}
if passAll {
result.ValidSelections[selection.Name] = values
} else {
result.AddFailure(failure)
}
} else {
result.putRequiredFailure(selection.Name, selection.Message)
}
return nil
}