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// Copyright 2025 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package api
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"net/http"
)
func getJSON[Resp any](ctx context.Context, url string) (*Resp, error) {
httpReq, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return nil, err
}
return finishRequest[Resp](httpReq)
}
func postJSON[Req any, Resp any](ctx context.Context, url string, req *Req) (*Resp, error) {
jsonBody, err := json.Marshal(req)
if err != nil {
return nil, err
}
httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBuffer(jsonBody))
if err != nil {
return nil, err
}
httpReq.Header.Set("Content-Type", "application/json")
return finishRequest[Resp](httpReq)
}
func postMultiPartFile[Resp any](ctx context.Context, url string, reader io.Reader) (*Resp, error) {
// TODO: this will work well only up to some size of the file. We need a pipe and a goroutine.
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
part, err := writer.CreateFormFile("content", "content")
if err != nil {
return nil, fmt.Errorf("failed to create a form file part: %w", err)
}
if _, err := io.Copy(part, reader); err != nil {
return nil, err
}
if err := writer.Close(); err != nil {
return nil, err
}
httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, body)
if err != nil {
return nil, err
}
httpReq.Header.Set("Content-Type", writer.FormDataContentType())
return finishRequest[Resp](httpReq)
}
func ReplyJSON[T any](w http.ResponseWriter, resp T) {
w.Header().Set("Content-Type", "application/json")
err := json.NewEncoder(w).Encode(resp)
if err != nil {
http.Error(w, "failed to serialize the response", http.StatusInternalServerError)
return
}
}
func ParseJSON[T any](w http.ResponseWriter, r *http.Request) *T {
if r.Method != http.MethodPost {
http.Error(w, "must be called via POST", http.StatusMethodNotAllowed)
return nil
}
body, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, "failed to read body", http.StatusBadRequest)
return nil
}
var data T
err = json.Unmarshal(body, &data)
if err != nil {
http.Error(w, "invalid body", http.StatusBadRequest)
return nil
}
return &data
}
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