/
http.go
212 lines (179 loc) · 5.15 KB
/
http.go
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package http
import (
"bytes"
"encoding/json"
"io"
"mime/multipart"
"net/http"
"net/url"
"os"
"path/filepath"
"github.com/gamejolt/cli/config"
customIO "github.com/gamejolt/cli/pkg/io"
)
// SimpleClient is a simplified http client
type SimpleClient struct {
// Base is the base to use for all urls. If empty, will use the given urls as is.
Base string
// NewRequest allows to customize which http.Request the simple client will use.
NewRequest func(method, urlStr string, body io.Reader) (*http.Request, error)
}
// NewSimpleClient creates a new default client
func NewSimpleClient() *SimpleClient {
client := &SimpleClient{
Base: "",
NewRequest: func(method, urlStr string, body io.Reader) (*http.Request, error) {
return http.NewRequest(method, urlStr, body)
},
}
return client
}
func (c *SimpleClient) send(req *http.Request) (*http.Request, *http.Response, error) {
res, err := http.DefaultClient.Do(req)
return req, res, err
}
func (c *SimpleClient) getURL(urlStr string, forUpload bool) (*url.URL, error) {
base, err := url.Parse(c.Base)
if err != nil {
return nil, err
}
if forUpload {
base.Host = config.UploadHost
}
u, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
return base.ResolveReference(u), nil
}
func (c *SimpleClient) buildQuery(urlStr string, get url.Values, forUpload bool) (string, error) {
urlData, err := c.getURL(urlStr, forUpload)
if err != nil {
return "", err
}
query := urlData.Query()
for key, values := range get {
if len(values) == 1 {
query.Set(key, values[0])
} else {
key += "[]"
for _, value := range values {
query.Add(key, value)
}
}
}
urlData.RawQuery = query.Encode()
return urlData.String(), nil
}
// Get does an http get
func (c *SimpleClient) Get(urlStr string, params url.Values) (*http.Request, *http.Response, error) {
urlStr, err := c.buildQuery(urlStr, params, false)
if err != nil {
return nil, nil, err
}
req, err := c.NewRequest("GET", urlStr, nil)
if err != nil {
return nil, nil, err
}
return c.send(req)
}
// Post does an http post of type application/json
func (c *SimpleClient) Post(urlStr string, get url.Values, post interface{}) (*http.Request, *http.Response, error) {
urlStr, err := c.buildQuery(urlStr, get, false)
if err != nil {
return nil, nil, err
}
jsonBytes, err := json.Marshal(post)
if err != nil {
return nil, nil, err
}
req, err := c.NewRequest("POST", urlStr, bytes.NewBuffer(jsonBytes))
if err != nil {
return nil, nil, err
}
req.Header.Set("Content-Type", "application/json")
return c.send(req)
}
// MultipartFileEntry is a multipart file entry.
// It is used to map a file to it's field value and label for Multipart requests.
type MultipartFileEntry struct {
Param string
Path string
File *os.File
}
func (c *SimpleClient) makeMultipartEntries(files map[string]string) ([]MultipartFileEntry, error) {
fileEntries := []MultipartFileEntry{}
for fileParam, path := range files {
fileHandle, err := os.Open(path)
if err != nil {
return nil, err
}
fileEntries = append(fileEntries, MultipartFileEntry{
Param: fileParam,
Path: path,
File: fileHandle,
})
}
return fileEntries, nil
}
// WriteFileFunc allows the caller to customize how the file is written.
// If this is null, a simple io.Copy will be done.
type WriteFileFunc func(dst io.Writer, src MultipartFileEntry) (int64, error)
func (c *SimpleClient) uploadMultipartEntries(fileEntries []MultipartFileEntry, reqWriter io.WriteCloser, multipartWriter *multipart.Writer, writeFileCallback WriteFileFunc) {
for _, fileEntry := range fileEntries {
defer fileEntry.File.Close()
}
defer reqWriter.Close()
defer multipartWriter.Close()
for _, fileEntry := range fileEntries {
fileField, err := multipartWriter.CreateFormFile(fileEntry.Param, filepath.Base(fileEntry.Path))
if err != nil {
return
}
if writeFileCallback == nil {
_, err = io.Copy(fileField, customIO.NewReader(fileEntry.File))
} else {
_, err = writeFileCallback(fileField, fileEntry)
}
fileEntry.File.Close()
if err != nil {
return
}
}
}
// Multipart does a multipart file upload request of type multipart/form-data
func (c *SimpleClient) Multipart(urlStr string, files map[string]string, get, post url.Values, writeFileCallback WriteFileFunc) (*http.Request, *http.Response, error) {
urlStr, err := c.buildQuery(urlStr, get, true)
if err != nil {
return nil, nil, err
}
fileEntries, err := c.makeMultipartEntries(files)
if err != nil {
return nil, nil, err
}
reqReader, reqWriter := io.Pipe()
multipartWriter := multipart.NewWriter(reqWriter)
go func() {
for key, values := range post {
if len(values) == 1 {
if err := multipartWriter.WriteField(key, values[0]); err != nil {
return
}
} else {
key += "[]"
for _, value := range values {
if err := multipartWriter.WriteField(key, value); err != nil {
return
}
}
}
}
c.uploadMultipartEntries(fileEntries, reqWriter, multipartWriter, writeFileCallback)
}()
req, err := c.NewRequest("POST", urlStr, reqReader)
if err != nil {
return nil, nil, err
}
req.Header.Set("Content-Type", multipartWriter.FormDataContentType())
return c.send(req)
}