forked from ridewindx/wechat
/
client.go
261 lines (222 loc) · 5.11 KB
/
client.go
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package mp
import (
"bytes"
"encoding/json"
"io"
"io/ioutil"
"mime"
"mime/multipart"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"fmt"
"strconv"
)
var BASE_URL URL = "https://api.weixin.qq.com/cgi-bin"
var CORP_BASE_URL URL = "https://qyapi.weixin.qq.com/cgi-bin"
type Client struct {
*TokenAccessor
*http.Client
AgentID int64 // corp app ID
}
func NewClient(appID, appSecret string, needsTicket bool) *Client {
return &Client{
TokenAccessor: NewTokenAccessor(appID, appSecret, needsTicket),
Client: http.DefaultClient,
}
}
func NewCorpClient(corpID, secret string, agentID int64) *Client {
return &Client{
TokenAccessor: NewCorpTokenAccessor(corpID, secret),
Client: http.DefaultClient,
AgentID: agentID,
}
}
func (c *Client) urlAddAgentID(u URL) URL {
return u.Query("agentid", strconv.FormatInt(c.AgentID, 10))
}
func (c *Client) call(u URL, rep interface{}, streamRep io.Writer, request func(URL) (*http.Response, error)) error {
token, err := c.Token()
if err != nil {
return err
}
firstTime := true
RETRY:
r, err := request(u.Query("access_token", token))
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return fmt.Errorf("http.Status: %s", r.Status)
}
if streamRep != nil {
contentDisposition := r.Header.Get("Content-Disposition")
contentType, _, _ := mime.ParseMediaType(r.Header.Get("Content-Type"))
if contentDisposition != "" && contentType != "text/plain" && contentType != "application/json" {
_, err = io.Copy(streamRep, r.Body)
return err
}
}
err = json.NewDecoder(r.Body).Decode(rep)
if err != nil {
return err
}
e := rep.(Error)
if e.Code() == OK {
return nil
}
if (e.Code() == InvalidCredential || e.Code() == AccessTokenExpired) && firstTime {
firstTime = false
token, err = c.RefreshToken(token)
if err != nil {
return err
}
goto RETRY
}
return rep.(error)
}
func (c *Client) Get(u URL, rep interface{}) error {
return c.call(u, rep, nil, func(u URL) (*http.Response, error) {
return c.Client.Get(string(u))
})
}
func (c *Client) Post(u URL, req, rep interface{}) error {
buf := &bytes.Buffer{}
err := json.NewEncoder(buf).Encode(req)
if err != nil {
return err
}
return c.call(u, rep, nil, func(u URL) (*http.Response, error) {
return c.Client.Post(string(u), "application/json; charset=utf-8", buf)
})
}
var MaxMemoryForFile = 10 * 1024 * 1024
type fileBuf struct {
bytes.Buffer
*os.File
n int
}
func (fb *fileBuf) Write(p []byte) (n int, err error) {
if fb.File != nil {
n, err = fb.File.Write(p)
fb.n += n
return
}
pr := bytes.NewReader(p)
nn, err := io.CopyN(&fb.Buffer, pr, int64(MaxMemoryForFile+1-fb.n))
n = int(nn)
fb.n += n
if err != nil && err != io.EOF {
return
}
if fb.n > MaxMemoryForFile && fb.File == nil {
// too big, write to disk and flush buffer
var file *os.File
file, err = ioutil.TempFile("", "multipart-")
if err != nil {
return
}
p = p[n:]
fb.n, err = file.Write(fb.Buffer.Bytes())
if err == nil {
var nn int
nn, err = file.Write(p)
n += nn
fb.n += nn
}
if err != nil {
file.Close()
os.Remove(file.Name())
return
}
fb.File = file
}
return
}
func (fb *fileBuf) Close() error {
if fb.File != nil {
return fb.File.Close()
}
return nil
}
func (c *Client) UploadFile(u URL, name, filePath string, extraFields map[string]string, rep interface{}) error {
var buf fileBuf
defer buf.Close()
mp := multipart.NewWriter(&buf)
partWriter, err := mp.CreateFormFile(name, filepath.Base(filePath))
if err != nil {
return err
}
file, err := os.Open(filePath)
if err != nil {
return err
}
defer file.Close()
if _, err = io.Copy(partWriter, file); err != nil {
return err
}
for k, v := range extraFields {
if err = mp.WriteField(k, v); err != nil {
return err
}
}
if err = mp.Close(); err != nil {
return err
}
var reader io.ReadSeeker
if buf.File != nil {
reader = buf.File
} else {
reader = bytes.NewReader(buf.Buffer.Bytes())
}
return c.call(u, rep, nil, func(u URL) (*http.Response, error) {
_, err := reader.Seek(0, 0)
if err != nil {
return nil, err
}
return c.Client.Post(string(u), mp.FormDataContentType(), reader)
})
}
func (c *Client) DownloadFile(u URL, req interface{}, filePath string, rep interface{}) (err error) {
file, err := os.Create(filePath)
if err != nil {
return err
}
defer func() {
file.Close()
if err != nil {
os.Remove(filePath)
}
}()
return c.call(u, rep, file, func(u URL) (*http.Response, error) {
if req == nil {
return c.Client.Get(string(u))
} else {
buf := &bytes.Buffer{}
err := json.NewEncoder(buf).Encode(req)
if err != nil {
return nil, err
}
return c.Client.Post(string(u), "application/json; charset=utf-8", buf)
}
})
}
type URL string
func (u URL) Join(segment string) URL {
return URL(string(u) + segment)
}
func (u URL) Query(key, value string) URL {
buf := bytes.NewBufferString(string(u))
if strings.IndexByte(string(u), '?') > -1 {
buf.WriteByte('&')
} else {
buf.WriteByte('?')
}
buf.WriteString(key)
buf.WriteByte('=')
buf.WriteString(url.QueryEscape(value))
return URL(buf.String())
}