Add more code to indieauth

auth.go

@@ -4,10 +4,13 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"log"
 	"net"
 	"net/http"
 	"net/url"
+	"os"
+	"strings"
 
 	"linkheader"
 
@@ -15,6 +18,10 @@ import (
 	"willnorris.com/go/microformats"
 )
 
+type AuthResponse struct {
+	Me string `json:"me"`
+}
+
 type Endpoints struct {
 	AuthorizationEndpoint string `json:"authorization_endpoint"`
 	TokenEndpoint         string `json:"token_endpoint"`
@@ -183,3 +190,86 @@ func CreateAuthorizationURL(authURL url.URL, meURL, clientID, redirectURI, state
 	authURL.RawQuery = q.Encode()
 	return authURL.String()
 }
+
+func VerifyAuthCode(code, redirectURI, authEndpoint string) (bool, *AuthResponse, error) {
+	const ClientID = "https://p83.nl/track-me"
+
+	reqData := url.Values{}
+	reqData.Set("code", code)
+	reqData.Set("client_id", ClientID)
+	reqData.Set("redirect_uri", redirectURI)
+
+	req, err := http.NewRequest(http.MethodPost, authEndpoint, strings.NewReader(reqData.Encode()))
+	if err != nil {
+		return false, nil, err
+	}
+
+	req.Header.Add("Accept", "application/json")
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+
+	client := http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return false, nil, err
+	}
+
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 200 {
+		input := io.TeeReader(resp.Body, os.Stderr)
+		dec := json.NewDecoder(input)
+		var authResponse AuthResponse
+		err = dec.Decode(&authResponse)
+		if err != nil {
+			return false, nil, err
+		}
+
+		return true, &authResponse, nil
+	}
+
+	return false, nil, fmt.Errorf("HTTP response code from authorization_endpoint (%s) %d", authEndpoint, resp.StatusCode)
+}
+
+
+type App struct {
+	Name    string
+	IconURL string
+}
+
+func getPropString(mf *microformats.Microformat, prop string) string {
+	if v, e := mf.Properties[prop]; e {
+		if len(v) > 0 {
+			if val, ok := v[0].(string); ok {
+				return val
+			}
+		}
+	}
+
+	return ""
+}
+
+func GetAppInfo(clientID string) (App, error) {
+	var app App
+	clientURL, err := url.Parse(clientID)
+	if err != nil {
+		return app, err
+	}
+	resp, err := http.Get(clientID)
+	if err != nil {
+		return app, err
+	}
+	defer resp.Body.Close()
+
+	md := microformats.Parse(resp.Body, clientURL)
+
+	if len(md.Items) > 0 {
+		mf := md.Items[0]
+
+		if mf.Type[0] == "h-x-app" || mf.Type[0] == "h-app" {
+			app.Name = getPropString(mf, "name")
+			app.IconURL = getPropString(mf, "logo")
+		}
+	}
+
+	return app, nil
+}