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oauth_generic.go
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oauth_generic.go
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/*
* Copyright © 2020-2021 Musing Studio LLC and respective authors.
*
* This file is part of WriteFreely.
*
* WriteFreely is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, included
* in the LICENSE file in this source code package.
*/
package writefreely
import (
"context"
"errors"
"fmt"
"github.com/writeas/web-core/log"
"net/http"
"net/url"
"strings"
)
type genericOauthClient struct {
ClientID string
ClientSecret string
AuthLocation string
ExchangeLocation string
InspectLocation string
CallbackLocation string
Scope string
MapUserID string
MapUsername string
MapDisplayName string
MapEmail string
HttpClient HttpClient
}
var _ oauthClient = genericOauthClient{}
const (
genericOauthDisplayName = "OAuth"
)
func (c genericOauthClient) GetProvider() string {
return "generic"
}
func (c genericOauthClient) GetClientID() string {
return c.ClientID
}
func (c genericOauthClient) GetCallbackLocation() string {
return c.CallbackLocation
}
func (c genericOauthClient) buildLoginURL(state string) (string, error) {
u, err := url.Parse(c.AuthLocation)
if err != nil {
return "", err
}
q := u.Query()
q.Set("client_id", c.ClientID)
q.Set("redirect_uri", c.CallbackLocation)
q.Set("response_type", "code")
q.Set("state", state)
q.Set("scope", c.Scope)
u.RawQuery = q.Encode()
return u.String(), nil
}
func (c genericOauthClient) exchangeOauthCode(ctx context.Context, code string) (*TokenResponse, error) {
form := url.Values{}
form.Add("grant_type", "authorization_code")
form.Add("redirect_uri", c.CallbackLocation)
form.Add("scope", c.Scope)
form.Add("code", code)
req, err := http.NewRequest("POST", c.ExchangeLocation, strings.NewReader(form.Encode()))
if err != nil {
return nil, err
}
req.WithContext(ctx)
req.Header.Set("User-Agent", ServerUserAgent(""))
req.Header.Set("Accept", "application/json")
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.SetBasicAuth(c.ClientID, c.ClientSecret)
resp, err := c.HttpClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, errors.New("unable to exchange code for access token")
}
var tokenResponse TokenResponse
if err := limitedJsonUnmarshal(resp.Body, tokenRequestMaxLen, &tokenResponse); err != nil {
return nil, err
}
if tokenResponse.Error != "" {
return nil, errors.New(tokenResponse.Error)
}
return &tokenResponse, nil
}
func (c genericOauthClient) inspectOauthAccessToken(ctx context.Context, accessToken string) (*InspectResponse, error) {
req, err := http.NewRequest("GET", c.InspectLocation, nil)
if err != nil {
return nil, err
}
req.WithContext(ctx)
req.Header.Set("User-Agent", ServerUserAgent(""))
req.Header.Set("Accept", "application/json")
req.Header.Set("Authorization", "Bearer "+accessToken)
resp, err := c.HttpClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, errors.New("unable to inspect access token")
}
// since we don't know what the JSON from the server will look like, we create a
// generic interface and then map manually to values set in the config
var genericInterface map[string]interface{}
if err := limitedJsonUnmarshal(resp.Body, infoRequestMaxLen, &genericInterface); err != nil {
return nil, err
}
// map each relevant field in inspectResponse to the mapped field from the config
var inspectResponse InspectResponse
inspectResponse.UserID, _ = genericInterface[c.MapUserID].(string)
if inspectResponse.UserID == "" {
log.Error("[CONFIGURATION ERROR] Generic OAuth provider returned empty UserID value (`%s`).\n Do you need to configure a different `map_user_id` value for this provider?", c.MapUserID)
return nil, fmt.Errorf("no UserID (`%s`) value returned", c.MapUserID)
}
inspectResponse.Username, _ = genericInterface[c.MapUsername].(string)
inspectResponse.DisplayName, _ = genericInterface[c.MapDisplayName].(string)
inspectResponse.Email, _ = genericInterface[c.MapEmail].(string)
return &inspectResponse, nil
}

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