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client.go
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client.go
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package client
import (
"encoding/json"
"net/http"
"net/url"
"strings"
"time"
)
type Client struct {
ClientId string
clientSecret string
AccessToken string
AccessTokenExpirationTime time.Time
Username string
password string
httpClient *http.Client
UserAgent string
lastRequestTime time.Time
}
func New(clientId string, clientSecret string) *Client {
c := &Client{
ClientId: clientId,
clientSecret: clientSecret,
UserAgent: "golang:maybemaybemaybe_bot:v0.0.1 (by /u/ninja_haiku)",
httpClient: &http.Client{},
}
return c
}
func (c *Client) doRequest(request *http.Request) (response *http.Response, err error) {
request.Header.Set("User-Agent", c.UserAgent)
waitLength := time.Duration(2) * time.Second
elapsedTime := time.Now().Sub(c.lastRequestTime)
if elapsedTime < waitLength {
time.Sleep(waitLength - elapsedTime)
}
response, err = c.httpClient.Do(request)
c.lastRequestTime = time.Now()
return
}
func (c *Client) Signin(username string, password string) {
c.Username = username
c.password = password
}
func (c *Client) authorize() error {
if c.AccessToken != "" && time.Now().Before(c.AccessTokenExpirationTime) {
return nil
}
form := url.Values{
"grant_type": {"password"},
"username": {c.Username},
"password": {c.password},
}
endpointUrl := "https://www.reddit.com/api/v1/access_token"
req, err := http.NewRequest("POST", endpointUrl, strings.NewReader(form.Encode()))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.SetBasicAuth(c.ClientId, c.clientSecret)
resp, err := c.doRequest(req)
if err != nil {
return err
}
defer resp.Body.Close()
type TokenStruct struct {
Scope string
AccessToken string `json:"access_token"`
ExpiresIn int `json:"expires_in"`
}
token_struct := TokenStruct{}
decoder := json.NewDecoder(resp.Body)
err = decoder.Decode(&token_struct)
if err != nil {
return err
}
c.AccessToken = token_struct.AccessToken
c.AccessTokenExpirationTime = time.Now().Add(time.Duration(token_struct.ExpiresIn) * time.Second)
return nil
}
func (c *Client) Get(resourceUrl string) (*http.Response, error) {
err := c.authorize()
if err != nil {
return nil, err
}
endpointUrl := "https://oauth.reddit.com" + resourceUrl
req, err := http.NewRequest("GET", endpointUrl, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", c.UserAgent)
req.Header.Set("Authorization", "bearer "+c.AccessToken)
return c.doRequest(req)
}
func (c *Client) Post(resourceUrl string, values url.Values) (*http.Response, error) {
err := c.authorize()
if err != nil {
return nil, err
}
endpointUrl := "https://oauth.reddit.com" + resourceUrl
req, err := http.NewRequest("POST", endpointUrl, strings.NewReader(values.Encode()))
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", c.UserAgent)
req.Header.Set("Authorization", "bearer "+c.AccessToken)
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
return c.doRequest(req)
}
func (c *Client) SubmitComment(parentId string, text string) error {
values := url.Values{
"api_type": {"json"},
"text": {text},
"thing_id": {parentId},
}
response, err := c.Post("/api/comment.json", values)
if err != nil {
return err
}
defer response.Body.Close()
/* TODO: Parse response and actually make sure submission was successful */
return nil
}