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request.go
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request.go
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package rest
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"slices"
"strings"
"time"
rest "github.com/hasura/ndc-rest-schema/schema"
"github.com/hasura/ndc-rest/rest/internal"
"github.com/hasura/ndc-sdk-go/utils"
)
// RetryableRequest wraps the raw request with retryable
type RetryableRequest struct {
rawRequest *rest.Request
contentType string
headers http.Header
body *bytes.Buffer
}
// CreateRequest creates an HTTP request with body copied
func (r *RetryableRequest) CreateRequest(ctx context.Context) (*http.Request, context.CancelFunc, error) {
var body io.Reader
if r.body != nil {
body = r.body
}
ctxR, cancel := context.WithTimeout(ctx, time.Duration(r.rawRequest.Timeout)*time.Second)
request, err := http.NewRequestWithContext(ctxR, strings.ToUpper(r.rawRequest.Method), r.rawRequest.URL, body)
if err != nil {
cancel()
return nil, nil, err
}
for key, header := range r.headers {
request.Header[key] = header
}
request.Header.Set(rest.ContentTypeHeader, r.contentType)
return request, cancel, nil
}
func (c *RESTConnector) createRequest(rawRequest *rest.Request, headers http.Header, arguments map[string]any) (*RetryableRequest, error) {
var buffer *bytes.Buffer
contentType := contentTypeJSON
bodyData, ok := arguments["body"]
if rawRequest.RequestBody != nil {
contentType = rawRequest.RequestBody.ContentType
if ok && bodyData != nil {
binaryBody := getRequestUploadBody(rawRequest)
if binaryBody != nil {
b64, err := utils.DecodeString(bodyData)
if err != nil {
return nil, err
}
dataURI, err := internal.DecodeDataURI(b64)
if err != nil {
return nil, err
}
buffer = bytes.NewBuffer([]byte(dataURI.Data))
} else if strings.HasPrefix(contentType, "text/") {
buffer = bytes.NewBuffer([]byte(fmt.Sprint(bodyData)))
} else if strings.HasPrefix(contentType, "multipart/") {
var err error
buffer, contentType, err = c.createMultipartForm(rawRequest.RequestBody, arguments)
if err != nil {
return nil, err
}
} else {
switch contentType {
case rest.ContentTypeFormURLEncoded:
// do nothing, body properties are moved to parameters
case rest.ContentTypeJSON:
bodyBytes, err := json.Marshal(bodyData)
if err != nil {
return nil, err
}
buffer = bytes.NewBuffer(bodyBytes)
default:
return nil, fmt.Errorf("unsupported content type %s", contentType)
}
}
} else if contentType != rest.ContentTypeFormURLEncoded &&
(rawRequest.RequestBody.Schema != nil && !rawRequest.RequestBody.Schema.Nullable) {
return nil, errors.New("request body is required")
}
}
request := &RetryableRequest{
rawRequest: rawRequest,
contentType: contentType,
headers: headers,
body: buffer,
}
return request, nil
}
func (c *RESTConnector) createMultipartForm(reqBody *rest.RequestBody, arguments map[string]any) (*bytes.Buffer, string, error) {
bodyData := arguments["body"]
buffer := new(bytes.Buffer)
writer := internal.NewMultipartWriter(buffer)
dataMap, ok := bodyData.(map[string]any)
if !ok {
return nil, "", fmt.Errorf("failed to decode request body, expect object, got: %v", bodyData)
}
if reqBody.Schema.Type != "object" || len(reqBody.Schema.Properties) == 0 {
return nil, "", errors.New("invalid object schema for multipart")
}
for key, value := range dataMap {
prop, ok := reqBody.Schema.Properties[key]
if !ok {
continue
}
var enc *rest.EncodingObject
if len(reqBody.Encoding) > 0 {
en, ok := reqBody.Encoding[key]
if ok {
enc = &en
}
}
err := c.evalMultipartFieldValue(writer, arguments, key, value, &prop, enc)
if err != nil {
return nil, "", fmt.Errorf("%s: %s", key, err)
}
}
if err := writer.Close(); err != nil {
return nil, "", err
}
return buffer, writer.FormDataContentType(), nil
}
func (c *RESTConnector) evalMultipartFieldValue(w *internal.MultipartWriter, arguments map[string]any, name string, value any, typeSchema *rest.TypeSchema, encObject *rest.EncodingObject) error {
if utils.IsNil(value) {
return nil
}
var headers http.Header
var err error
if encObject != nil && len(encObject.Headers) > 0 {
headers, err = c.evalEncodingHeaders(encObject.Headers, arguments)
if err != nil {
return err
}
}
if slices.Contains([]string{"object", "array"}, typeSchema.Type) && (encObject == nil || slices.Contains(encObject.ContentType, rest.ContentTypeJSON)) {
return w.WriteJSON(name, value, headers)
}
switch typeSchema.Type {
case "file", string(rest.ScalarBinary):
return w.WriteDataURI(name, value, headers)
default:
params, err := c.encodeParameterValues(typeSchema, value, []string{})
if err != nil {
return err
}
if len(params) == 0 {
return nil
}
for _, p := range params {
keys := p.Keys()
values := p.Values()
fieldName := name
if len(keys) > 0 {
keys = append([]internal.Key{internal.NewKey(name)}, keys...)
fieldName = keys.String()
}
if typeSchema.Type == "array" || len(values) > 1 {
fieldName = fmt.Sprintf("%s[]", fieldName)
for _, v := range values {
if err = w.WriteField(fieldName, v, headers); err != nil {
return err
}
}
} else if len(values) == 1 {
if err = w.WriteField(fieldName, values[0], headers); err != nil {
return err
}
}
}
}
return nil
}
func (c *RESTConnector) evalEncodingHeaders(encHeaders map[string]rest.RequestParameter, arguments map[string]any) (http.Header, error) {
results := http.Header{}
for key, param := range encHeaders {
argumentName := param.ArgumentName
if argumentName == "" {
argumentName = key
}
rawHeaderValue, ok := arguments[argumentName]
if !ok {
continue
}
headerParams, err := c.encodeParameterValues(param.Schema, rawHeaderValue, []string{})
if err != nil {
return nil, err
}
param.Name = key
setHeaderParameters(&results, ¶m, headerParams)
}
return results, nil
}
func getRequestUploadBody(rawRequest *rest.Request) *rest.RequestBody {
if rawRequest.RequestBody == nil {
return nil
}
if rawRequest.RequestBody.ContentType == "application/octet-stream" {
return rawRequest.RequestBody
}
if rawRequest.RequestBody.Schema != nil && rawRequest.RequestBody.Schema.Type == string(rest.ScalarBinary) {
return rawRequest.RequestBody
}
return nil
}