Refactoring separate file for OAuth2 provider

bouquins/auth.go

@@ -1,7 +1,6 @@
 package bouquins
 
 import (
-	"encoding/json"
 	"fmt"
 	"log"
 	"math/rand"
@@ -22,7 +21,7 @@ const (
 )
 
 var (
-	Providers = [1]OAuth2Provider{GithubProvider("github")}
+	Providers []OAuth2Provider
 )
 
 type OAuth2Provider interface {
@@ -30,50 +29,6 @@ type OAuth2Provider interface {
 	Name() string
 }
 
-type GithubProvider string
-
-func (p GithubProvider) Name() string {
-	return string(p)
-}
-func (p GithubProvider) GetUser(token *oauth2.Token) (string, error) {
-	apiReq, err := http.NewRequest("GET", "https://api.github.com/user/emails", nil)
-	apiReq.Header.Add("Accept", "application/vnd.github.v3+json")
-	apiReq.Header.Add("Authorization", "token "+token.AccessToken)
-	client := &http.Client{}
-	response, err := client.Do(apiReq)
-	defer response.Body.Close()
-	if err != nil {
-		log.Println("Auth error", err)
-		return "", fmt.Errorf("Authentification error")
-	}
-
-	dec := json.NewDecoder(response.Body)
-	var emails []GitHubEmail
-	err = dec.Decode(&emails)
-	if err != nil {
-		log.Println("Error reading github API response", err)
-		return "", fmt.Errorf("Error reading github API response")
-	}
-	fmt.Printf("Content: %s\n", emails)
-	var userEmail string
-	for _, email := range emails {
-		if email.Primary && email.Verified {
-			userEmail = email.Email
-		}
-	}
-	log.Println("User email:", userEmail)
-	return userEmail, nil
-}
-
-func findProvider(name string) OAuth2Provider {
-	for _, p := range Providers {
-		if p.Name() == name {
-			return p
-		}
-	}
-	return nil
-}
-
 // generates a 16 characters long random string
 func securedRandString() string {
 	b := make([]byte, 16)

bouquins/github.go

@@ -0,0 +1,59 @@
+package bouquins
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+
+	"golang.org/x/oauth2"
+)
+
+type GithubProvider string
+
+func init() {
+	Providers = append(Providers, GithubProvider("github"))
+}
+
+func (p GithubProvider) Name() string {
+	return string(p)
+}
+
+func (p GithubProvider) GetUser(token *oauth2.Token) (string, error) {
+	apiReq, err := http.NewRequest("GET", "https://api.github.com/user/emails", nil)
+	apiReq.Header.Add("Accept", "application/vnd.github.v3+json")
+	apiReq.Header.Add("Authorization", "token "+token.AccessToken)
+	client := &http.Client{}
+	response, err := client.Do(apiReq)
+	defer response.Body.Close()
+	if err != nil {
+		log.Println("Auth error", err)
+		return "", fmt.Errorf("Authentification error")
+	}
+
+	dec := json.NewDecoder(response.Body)
+	var emails []GitHubEmail
+	err = dec.Decode(&emails)
+	if err != nil {
+		log.Println("Error reading github API response", err)
+		return "", fmt.Errorf("Error reading github API response")
+	}
+	fmt.Printf("Content: %s\n", emails)
+	var userEmail string
+	for _, email := range emails {
+		if email.Primary && email.Verified {
+			userEmail = email.Email
+		}
+	}
+	log.Println("User email:", userEmail)
+	return userEmail, nil
+}
+
+func findProvider(name string) OAuth2Provider {
+	for _, p := range Providers {
+		if p.Name() == name {
+			return p
+		}
+	}
+	return nil
+}