Basically, I need to implement the following method in Go - https://api.slack.com/methods/users.lookupByEmail.
I tried doing it like this:
import (
"bytes"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
)
type Payload struct {
Email string `json:"email,omitempty"`
}
// assume the following code is inside some function
client := &http.Client{}
payload := Payload{
Email: "[email protected]",
}
body, err := json.Marshal(payload)
if err != nil {
return "", err
}
req, err := http.NewRequest("GET", "https://slack.com/api/users.lookupByEmail", bytes.NewReader(body))
if err != nil {
return "", err
}
req.Header.Add("Authorization", "Bearer "+token)
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
t, _ := ioutil.ReadAll(resp.Body)
return "", errors.New(string(t))
}
responseData, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(responseData), nil
But I get an error that "email" field is missing, which is obvious because this content-type does not support JSON payload:
{"ok":false,"error":"invalid_arguments","response_metadata":{"messages":["[ERROR] missing required field: email"]}} (type: string)
I couldn't find how to include a post form with the GET request - there is no available post form argument neither to http.NewRequest, nor to http.Client.Get; http.Client.PostForm issues a POST request but GET is needed in this case. Also, I think I have to use http.NewRequest here (unless another approach exists) because I need to set the Authorization header.
You misunderstand the application/x-www-form-urlencoded
header, you should pass an URL parameters here. Check out an example:
import (
...
"net/url"
...
)
data := url.Values{}
data.Set("email", "[email protected]")
data.Set("token", "SOME_TOKEN_GOES_HERE")
r, _ := http.NewRequest("GET", "https://slack.com/api/users.lookupByEmail", strings.NewReader(data.Encode()))
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
r.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))