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gh-check.go
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gh-check.go
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package main
import (
"encoding/base64"
"encoding/json"
"errors"
"github.com/garyburd/redigo/redis"
"github.com/google/go-github/github"
"github.com/hugbotme/hug-go/twitter"
"golang.org/x/oauth2"
"log"
netUrl "net/url"
"strings"
)
const (
CheckEverythingIsFine = iota
CheckURLParse
CheckHasNoReadme
CheckIsNotAllowed
)
type GitHubURL struct {
URL *netUrl.URL
Owner string
Repository string
}
// tokenSource is an oauth2.TokenSource which returns a static access token
type tokenSource struct {
token *oauth2.Token
}
// Token implements the oauth2.TokenSource interface
func (t *tokenSource) Token() (*oauth2.Token, error) {
return t.token, nil
}
func ParseGitHubURL(rawurl string) (*GitHubURL, error) {
parsed, err := netUrl.Parse(rawurl)
if err != nil {
return nil, err
}
if parsed.Host != "github.com" {
return nil, errors.New("Not a GitHub URL")
}
splitted := strings.Split(parsed.Path, "/")
if len(splitted) < 3 {
return nil, errors.New("Broken GitHub URL")
}
owner := splitted[1]
repository := splitted[2]
return &GitHubURL{
URL: parsed,
Owner: owner,
Repository: repository,
}, nil
}
func GitHubHasReadme(client *github.Client, url *GitHubURL) (bool, error) {
owner := url.Owner
repo := url.Repository
content, resp, err := client.Repositories.GetReadme(owner, repo, nil)
if err != nil {
log.Println(resp, err)
return false, err
}
_, err = base64.StdEncoding.DecodeString(*content.Content)
if err != nil {
return false, err
}
return true, nil
}
func CanonicalURL(url *GitHubURL) string {
return "http://github.com/" + url.Owner + "/" + url.Repository
}
func GitHubRepoAllowed(client redis.Conn, url *GitHubURL) bool {
b, err := redis.Bool(client.Do("EXISTS", "blacklist:"+CanonicalURL(url)))
if err != nil {
log.Print("EXIST failed", err)
return true
}
return !b
}
func AddToBlacklist(client redis.Conn, url *GitHubURL) error {
_, err := client.Do("SET", "blacklist:"+CanonicalURL(url), 1, "EX", 7*24*60*60)
return err
}
func AddToQueue(client redis.Conn, hug *twitter.Hug) error {
jsonHug, err := json.Marshal(hug)
if err != nil {
return err
}
_, err = client.Do("RPUSH", "hug:queue", string(jsonHug))
if err != nil {
log.Print("RPUSH failed", err)
}
return err
}
func GitHubClient(accessToken string) *github.Client {
ts := &tokenSource{
token: &oauth2.Token{AccessToken: accessToken},
}
tc := oauth2.NewClient(oauth2.NoContext, ts)
return github.NewClient(tc)
}
func ProcessURL(gh *github.Client, red redis.Conn, hug twitter.Hug) (int, error) {
parsed, err := ParseGitHubURL(hug.URL)
if err != nil {
return CheckURLParse, err
}
has, err := GitHubHasReadme(gh, parsed)
if err != nil {
return CheckHasNoReadme, err
}
allowed := GitHubRepoAllowed(red, parsed)
if !allowed {
return CheckIsNotAllowed, nil
}
if has && allowed {
AddToBlacklist(red, parsed)
}
return CheckEverythingIsFine, nil
}