forked from aggrolite/geddit
/
apponlyoauth_session.go
267 lines (222 loc) · 6.43 KB
/
apponlyoauth_session.go
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// Copyright 2012 Jimmy Zelinskie. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Copyright 2016 Samir Bhatt. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package geddit implements an abstraction for the reddit.com API.
package geddit
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/google/go-querystring/query"
"golang.org/x/net/context"
"golang.org/x/oauth2/clientcredentials"
)
// AppOnlyOAuthSession represents an OAuth session with reddit.com --
// all authenticated API calls are methods bound to this type.
type AppOnlyOAuthSession struct {
Client *http.Client
ClientID string
ClientSecret string
OAuthConfig *clientcredentials.Config
TokenExpiry time.Time
UserAgent string
ctx context.Context
Debug bool
}
// NewAppOnlyOAuthSession creates a new session for those who want to log into a
// reddit account via Application Only OAuth.
// See https://github.com/reddit/reddit/wiki/OAuth2#application-only-oauth
func NewAppOnlyOAuthSession(clientID, clientSecret, useragent string, debug bool) (*AppOnlyOAuthSession, error) {
s := &AppOnlyOAuthSession{}
if useragent != "" {
s.UserAgent = useragent
} else {
s.UserAgent = "Geddit API Client https://github.com/imheresamir/geddit"
}
s.ClientID = clientID
s.ClientSecret = clientSecret
// Set OAuth config
s.OAuthConfig = &clientcredentials.Config{
ClientID: clientID,
ClientSecret: clientSecret,
TokenURL: "https://www.reddit.com/api/v1/access_token",
}
s.ctx = context.Background()
return s, nil
}
// refreshToken should be called internally before each API call
func (a *AppOnlyOAuthSession) refreshToken() error {
// Check if token needs to be refreshed
if time.Now().Before(a.TokenExpiry) {
return nil
}
// Fetch OAuth token
t, err := a.OAuthConfig.Token(a.ctx)
if err != nil {
return err
}
a.TokenExpiry = t.Expiry
a.Client = a.OAuthConfig.Client(a.ctx)
return nil
}
func (a *AppOnlyOAuthSession) getBody(link string, d interface{}) error {
a.refreshToken()
req, err := http.NewRequest("GET", link, nil)
if err != nil {
return err
}
// This is needed to avoid rate limits
req.Header.Set("User-Agent", a.UserAgent)
if a.Client == nil {
return errors.New("OAuth Session lacks HTTP client! Error getting token")
}
resp, err := a.Client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
// DEBUG
if a.Debug {
fmt.Printf("***DEBUG***\nRequest Body: %s\n***DEBUG***\n\n", body)
}
err = json.Unmarshal(body, d)
if err != nil {
return err
}
return nil
}
// Listing returns a slice of Submission pointers.
// See https://www.reddit.com/dev/api#listings for documentation.
func (a *AppOnlyOAuthSession) Listing(username, listing string, sort popularitySort, params ListingOptions) ([]*Submission, error) {
p, err := query.Values(params)
if err != nil {
return nil, err
}
if sort != "" {
p.Set("sort", string(sort))
}
type resp struct {
Data struct {
Children []struct {
Data *Submission
}
}
}
r := &resp{}
url := fmt.Sprintf("https://oauth.reddit.com/user/%s/%s?%s", username, listing, p.Encode())
err = a.getBody(url, r)
if err != nil {
return nil, err
}
submissions := make([]*Submission, len(r.Data.Children))
for i, child := range r.Data.Children {
submissions[i] = child.Data
}
return submissions, nil
}
func (a *AppOnlyOAuthSession) Upvoted(username string, sort popularitySort, params ListingOptions) ([]*Submission, error) {
return a.Listing(username, "upvoted", sort, params)
}
// AboutRedditor returns a Redditor for the given username using OAuth.
func (a *AppOnlyOAuthSession) AboutRedditor(user string) (*Redditor, error) {
type redditor struct {
Data Redditor
}
r := &redditor{}
link := fmt.Sprintf("https://oauth.reddit.com/user/%s/about", user)
err := a.getBody(link, r)
if err != nil {
return nil, err
}
return &r.Data, nil
}
func (a *AppOnlyOAuthSession) UserTrophies(user string) ([]*Trophy, error) {
type trophyData struct {
Data struct {
Trophies []struct {
Data Trophy
}
}
}
t := &trophyData{}
url := fmt.Sprintf("https://oauth.reddit.com/api/v1/user/%s/trophies", user)
err := a.getBody(url, t)
if err != nil {
return nil, err
}
var trophies []*Trophy
for _, trophy := range t.Data.Trophies {
trophies = append(trophies, &trophy.Data)
}
return trophies, nil
}
// AboutSubreddit returns a subreddit for the given subreddit name using OAuth.
func (a *AppOnlyOAuthSession) AboutSubreddit(name string) (*Subreddit, error) {
type subreddit struct {
Data Subreddit
}
sr := &subreddit{}
link := fmt.Sprintf("https://oauth.reddit.com/r/%s/about", name)
err := a.getBody(link, sr)
if err != nil {
return nil, err
}
return &sr.Data, nil
}
// Comments returns the comments for a given Submission using OAuth.
func (a *AppOnlyOAuthSession) Comments(h *Submission, sort popularitySort, params ListingOptions) ([]*Comment, error) {
p, err := query.Values(params)
if err != nil {
return nil, err
}
var c interface{}
link := fmt.Sprintf("https://oauth.reddit.com/comments/%s?%s", h.ID, p.Encode())
err = a.getBody(link, &c)
if err != nil {
return nil, err
}
helper := new(helper)
helper.buildComments(c)
return helper.comments, nil
}
// SubredditSubmissions returns the submissions on the given subreddit using OAuth.
func (a *AppOnlyOAuthSession) SubredditSubmissions(subreddit string, sort popularitySort, params ListingOptions) ([]*Submission, error) {
v, err := query.Values(params)
if err != nil {
return nil, err
}
baseUrl := "https://oauth.reddit.com"
// If subbreddit given, add to URL
if subreddit != "" {
baseUrl += "/r/" + subreddit
}
redditURL := fmt.Sprintf(baseUrl+"/%s.json?%s", sort, v.Encode())
type Response struct {
Data struct {
Children []struct {
Data *Submission
}
}
}
r := new(Response)
err = a.getBody(redditURL, r)
if err != nil {
return nil, err
}
submissions := make([]*Submission, len(r.Data.Children))
for i, child := range r.Data.Children {
submissions[i] = child.Data
}
return submissions, nil
}
// Frontpage returns the submissions on the default reddit frontpage using OAuth.
func (a *AppOnlyOAuthSession) Frontpage(sort popularitySort, params ListingOptions) ([]*Submission, error) {
return a.SubredditSubmissions("", sort, params)
}