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http_form.go
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http_form.go
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package transport
import (
"encoding/json"
"io"
"io/ioutil"
"mime"
"net/http"
"os"
"strings"
"github.com/99designs/gqlgen/graphql"
)
// MultipartForm the Multipart request spec https://github.com/jaydenseric/graphql-multipart-request-spec
type MultipartForm struct {
// MaxUploadSize sets the maximum number of bytes used to parse a request body
// as multipart/form-data.
MaxUploadSize int64
// MaxMemory defines the maximum number of bytes used to parse a request body
// as multipart/form-data in memory, with the remainder stored on disk in
// temporary files.
MaxMemory int64
}
var _ graphql.Transport = MultipartForm{}
func (f MultipartForm) Supports(r *http.Request) bool {
if r.Header.Get("Upgrade") != "" {
return false
}
mediaType, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
if err != nil {
return false
}
return r.Method == "POST" && mediaType == "multipart/form-data"
}
func (f MultipartForm) maxUploadSize() int64 {
if f.MaxUploadSize == 0 {
return 32 << 20
}
return f.MaxUploadSize
}
func (f MultipartForm) maxMemory() int64 {
if f.MaxMemory == 0 {
return 32 << 20
}
return f.MaxMemory
}
func (f MultipartForm) Do(w http.ResponseWriter, r *http.Request, exec graphql.GraphExecutor) {
w.Header().Set("Content-Type", "application/json")
start := graphql.Now()
var err error
if r.ContentLength > f.maxUploadSize() {
writeJsonError(w, "failed to parse multipart form, request body too large")
return
}
r.Body = http.MaxBytesReader(w, r.Body, f.maxUploadSize())
if err = r.ParseMultipartForm(f.maxUploadSize()); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
if strings.Contains(err.Error(), "request body too large") {
writeJsonError(w, "failed to parse multipart form, request body too large")
return
}
writeJsonError(w, "failed to parse multipart form")
return
}
defer r.Body.Close()
var params graphql.RawParams
if err = jsonDecode(strings.NewReader(r.Form.Get("operations")), ¶ms); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonError(w, "operations form field could not be decoded")
return
}
var uploadsMap = map[string][]string{}
if err = json.Unmarshal([]byte(r.Form.Get("map")), &uploadsMap); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonError(w, "map form field could not be decoded")
return
}
var upload graphql.Upload
for key, paths := range uploadsMap {
if len(paths) == 0 {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonErrorf(w, "invalid empty operations paths list for key %s", key)
return
}
file, header, err := r.FormFile(key)
if err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonErrorf(w, "failed to get key %s from form", key)
return
}
defer file.Close()
if len(paths) == 1 {
upload = graphql.Upload{
File: file,
Size: header.Size,
Filename: header.Filename,
}
if err := params.AddUpload(upload, key, paths[0]); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonGraphqlError(w, err)
return
}
} else {
if r.ContentLength < f.maxMemory() {
fileBytes, err := ioutil.ReadAll(file)
if err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonErrorf(w, "failed to read file for key %s", key)
return
}
for _, path := range paths {
upload = graphql.Upload{
File: &bytesReader{s: &fileBytes, i: 0, prevRune: -1},
Size: header.Size,
Filename: header.Filename,
}
if err := params.AddUpload(upload, key, path); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonGraphqlError(w, err)
return
}
}
} else {
tmpFile, err := ioutil.TempFile(os.TempDir(), "gqlgen-")
if err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonErrorf(w, "failed to create temp file for key %s", key)
return
}
tmpName := tmpFile.Name()
defer func() {
_ = os.Remove(tmpName)
}()
_, err = io.Copy(tmpFile, file)
if err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
if err := tmpFile.Close(); err != nil {
writeJsonErrorf(w, "failed to copy to temp file and close temp file for key %s", key)
return
}
writeJsonErrorf(w, "failed to copy to temp file for key %s", key)
return
}
if err := tmpFile.Close(); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonErrorf(w, "failed to close temp file for key %s", key)
return
}
for _, path := range paths {
pathTmpFile, err := os.Open(tmpName)
if err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonErrorf(w, "failed to open temp file for key %s", key)
return
}
defer pathTmpFile.Close()
upload = graphql.Upload{
File: pathTmpFile,
Size: header.Size,
Filename: header.Filename,
}
if err := params.AddUpload(upload, key, path); err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
writeJsonGraphqlError(w, err)
return
}
}
}
}
}
params.ReadTime = graphql.TraceTiming{
Start: start,
End: graphql.Now(),
}
rc, gerr := exec.CreateOperationContext(r.Context(), ¶ms)
if gerr != nil {
resp := exec.DispatchError(graphql.WithOperationContext(r.Context(), rc), gerr)
w.WriteHeader(statusFor(gerr))
writeJson(w, resp)
return
}
responses, ctx := exec.DispatchOperation(r.Context(), rc)
writeJson(w, responses(ctx))
}