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client.go
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client.go
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package activiti
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/httputil"
)
// NewClient returns new Client struct
// BaseURL is the activiti rest api url, for example 'http://localhost:8080'
func NewClient(username string, password string, baseURL string) (*ActClient, error) {
if username == "" || password == "" || baseURL == "" {
return nil, errors.New("Username, Password and BaseURL are required to create a Client ")
}
return &ActClient{
Client: &http.Client{},
Username: username,
Password: password,
BaseURL: baseURL,
}, nil
}
// SetHTTPClient sets *http.Client to current client
func (c *ActClient) SetHTTPClient(client *http.Client) {
c.Client = client
}
// SetLog will set/change the output destination.
// If log file is set all requests and responses will be logged to this Writer
func (c *ActClient) SetLog(log io.Writer) {
c.Log = log
}
// Send makes a request to the API, the response body will be
// unmarshaled into v, or if v is an io.Writer, the response will
// be written to it without decoding
func (c *ActClient) Send(req *http.Request, v interface{}) error {
var (
err error
resp *http.Response
data []byte
)
// Set default headers
req.Header.Set("Accept", "application/json")
req.Header.Set("Accept-Language", "zh-CN,en_US")
if req.Header.Get("Content-type") == "" {
req.Header.Set("Content-type", "application/json")
}
resp, err = c.Client.Do(req)
c.log(req, resp)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 299 {
errResp := &ActErrorResponse{Response: resp}
data, err = ioutil.ReadAll(resp.Body)
if err == nil && len(data) > 0 {
json.Unmarshal(data, errResp)
}
return errResp
}
if v == nil {
return nil
}
if w, ok := v.(io.Writer); ok {
io.Copy(w, resp.Body)
return nil
}
return json.NewDecoder(resp.Body).Decode(v)
}
// SendWithBasicAuth makes a request to the API using username:password basic auth
func (c *ActClient) SendWithBasicAuth(req *http.Request, v interface{}) error {
req.SetBasicAuth(c.Username, c.Password)
return c.Send(req, v)
}
// NewRequest constructs a request
// Convert payload to a JSON
func (c *ActClient) NewRequest(method, url string, payload interface{}) (*http.Request, error) {
var buf io.Reader
if payload != nil {
var b []byte
b, err := json.Marshal(&payload)
if err != nil {
return nil, err
}
buf = bytes.NewBuffer(b)
}
return http.NewRequest(method, url, buf)
}
// log will dump request and response to the log file
func (c *ActClient) log(r *http.Request, resp *http.Response) {
if c.Log != nil {
var (
reqDump string
respDump []byte
)
if r != nil {
reqDump = fmt.Sprintf("%s %s. Data: %s", r.Method, r.URL.String(), r.Form.Encode())
}
if resp != nil {
respDump, _ = httputil.DumpResponse(resp, true)
}
c.Log.Write([]byte(fmt.Sprintf("Request: %s\nResponse: %s\n", reqDump, string(respDump))))
}
}