/
parser.go
218 lines (187 loc) · 6.24 KB
/
parser.go
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package request
import (
"encoding/json"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/tidepool-org/platform/crypto"
"github.com/tidepool-org/platform/errors"
"github.com/tidepool-org/platform/net"
"github.com/tidepool-org/platform/structure"
structureNormalizer "github.com/tidepool-org/platform/structure/normalizer"
structureParser "github.com/tidepool-org/platform/structure/parser"
structureValidator "github.com/tidepool-org/platform/structure/validator"
)
func DecodeRequestBody(req *http.Request, object interface{}) error {
if req == nil {
return errors.New("request is missing")
}
if req.Body == nil {
return ErrorJSONNotFound()
}
defer req.Body.Close()
return DecodeObject(structure.NewPointerSource(), req.Body, object)
}
func DecodeResponseBody(res *http.Response, object interface{}) error {
if res == nil {
return errors.New("response is missing")
}
if res.Body == nil {
return ErrorJSONNotFound()
}
defer res.Body.Close()
return DecodeObject(structure.NewPointerSource(), res.Body, object)
}
func DecodeObject(source structure.Source, reader io.Reader, object interface{}) error {
if err := ParseStreamObject(source, reader, object); err != nil {
return err
}
if err := ValidateObjects(source, object); err != nil {
return err
}
return NormalizeObjects(source, object)
}
func ParseStreamObject(source structure.Source, reader io.Reader, object interface{}) error {
if objectParsable, ok := object.(structure.ObjectParsable); ok {
return ParseObjectParseableStreamObject(source, reader, objectParsable)
}
if arrayParsable, ok := object.(structure.ArrayParsable); ok {
return ParseArrayParseableStreamObject(source, reader, arrayParsable)
}
return ParseSimpleStreamObject(reader, object)
}
func ParseObjectParseableStreamObject(source structure.Source, reader io.Reader, objectParsable structure.ObjectParsable) error {
object := &map[string]interface{}{}
if err := ParseSimpleStreamObject(reader, object); err != nil {
return err
}
parser := structureParser.NewObject(object).WithSource(source)
objectParsable.Parse(parser)
parser.NotParsed()
return parser.Error()
}
func ParseArrayParseableStreamObject(source structure.Source, reader io.Reader, arrayParsable structure.ArrayParsable) error {
array := &[]interface{}{}
if err := ParseSimpleStreamObject(reader, array); err != nil {
return err
}
parser := structureParser.NewArray(array).WithSource(source)
arrayParsable.Parse(parser)
parser.NotParsed()
return parser.Error()
}
func ParseSimpleStreamObject(reader io.Reader, object interface{}) error {
if reader == nil {
return errors.New("reader is missing")
}
if object == nil {
return errors.New("object is missing")
}
if err := json.NewDecoder(reader).Decode(object); err != nil {
if err == io.EOF {
return ErrorJSONNotFound()
}
return ErrorJSONMalformed()
}
return nil
}
func ValidateObjects(source structure.Source, objects ...interface{}) error {
validatables := []structure.Validatable{}
for _, object := range objects {
if validatable, ok := object.(structure.Validatable); ok {
validatables = append(validatables, validatable)
}
}
validator := structureValidator.New().WithSource(source)
for _, validatable := range validatables {
validatable.Validate(validator)
}
return validator.Error()
}
func NormalizeObjects(source structure.Source, objects ...interface{}) error {
normalizables := []structure.Normalizable{}
for _, object := range objects {
if normalizable, ok := object.(structure.Normalizable); ok {
normalizables = append(normalizables, normalizable)
}
}
normalizer := structureNormalizer.New().WithSource(source)
for _, normalizable := range normalizables {
normalizable.Normalize(normalizer)
}
return normalizer.Error()
}
func DecodeRequestQuery(req *http.Request, objectParsables ...structure.ObjectParsable) error {
if req == nil {
return errors.New("request is missing")
}
if req.URL == nil {
return errors.New("request url is missing")
}
values, err := url.ParseQuery(req.URL.RawQuery)
if err != nil {
return errors.New("unable to parse request query")
}
return DecodeValues((map[string][]string)(values), objectParsables...)
}
func DecodeValues(values map[string][]string, objectParsables ...structure.ObjectParsable) error {
objects := []interface{}{}
for _, object := range objectParsables {
objects = append(objects, object)
}
if err := ParseValuesObjects(values, objectParsables...); err != nil {
return err
}
if err := ValidateObjects(structure.NewParameterSource(), objects...); err != nil {
return err
}
return NormalizeObjects(structure.NewParameterSource(), objects...)
}
func ParseValuesObjects(values map[string][]string, objectParsables ...structure.ObjectParsable) error {
parser := NewValues(&values)
for _, objectParsable := range objectParsables {
objectParsable.Parse(parser)
}
parser.NotParsed()
return parser.Error()
}
func ParseSingletonHeader(header http.Header, key string) (*string, error) {
if values, ok := header[key]; !ok {
return nil, nil
} else if length := len(values); length == 0 {
return nil, nil
} else if length == 1 {
return &values[0], nil
}
return nil, ErrorHeaderInvalid(key)
}
func ParseDigestMD5Header(header http.Header, key string) (*string, error) {
if stringValue, err := ParseSingletonHeader(header, key); err != nil || stringValue == nil {
return nil, err
} else if parts := strings.SplitN(*stringValue, "=", 2); len(parts) == 2 {
if algorithm := strings.ToUpper(parts[0]); algorithm == "MD5" {
if value := parts[1]; crypto.IsValidBase64EncodedMD5Hash(value) {
return &value, nil
}
}
}
return nil, ErrorHeaderInvalid(key)
}
func ParseMediaTypeHeader(header http.Header, key string) (*string, error) {
if stringValue, err := ParseSingletonHeader(header, key); err != nil || stringValue == nil {
return nil, err
} else if value, valid := net.NormalizeMediaType(*stringValue); valid {
return &value, nil
}
return nil, ErrorHeaderInvalid(key)
}
func ParseIntHeader(header http.Header, key string) (*int, error) {
if stringValue, err := ParseSingletonHeader(header, key); err != nil || stringValue == nil {
return nil, err
} else if value, valueErr := strconv.Atoi(*stringValue); valueErr == nil {
return &value, nil
}
return nil, ErrorHeaderInvalid(key)
}