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| 1 | +package writefreely |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "errors" |
| 6 | + "net/http" |
| 7 | + "net/url" |
| 8 | + "strings" |
| 9 | +) |
| 10 | + |
| 11 | +type genericOauthClient struct { |
| 12 | + ClientID string |
| 13 | + ClientSecret string |
| 14 | + AuthLocation string |
| 15 | + ExchangeLocation string |
| 16 | + InspectLocation string |
| 17 | + CallbackLocation string |
| 18 | + HttpClient HttpClient |
| 19 | +} |
| 20 | + |
| 21 | +var _ oauthClient = genericOauthClient{} |
| 22 | + |
| 23 | +const ( |
| 24 | + genericOauthDisplayName = "oAuth" |
| 25 | +) |
| 26 | + |
| 27 | +func (c genericOauthClient) GetProvider() string { |
| 28 | + return "generic" |
| 29 | +} |
| 30 | + |
| 31 | +func (c genericOauthClient) GetClientID() string { |
| 32 | + return c.ClientID |
| 33 | +} |
| 34 | + |
| 35 | +func (c genericOauthClient) GetCallbackLocation() string { |
| 36 | + return c.CallbackLocation |
| 37 | +} |
| 38 | + |
| 39 | +func (c genericOauthClient) buildLoginURL(state string) (string, error) { |
| 40 | + u, err := url.Parse(c.AuthLocation) |
| 41 | + if err != nil { |
| 42 | + return "", err |
| 43 | + } |
| 44 | + q := u.Query() |
| 45 | + q.Set("client_id", c.ClientID) |
| 46 | + q.Set("redirect_uri", c.CallbackLocation) |
| 47 | + q.Set("response_type", "code") |
| 48 | + q.Set("state", state) |
| 49 | + q.Set("scope", "read_user") |
| 50 | + u.RawQuery = q.Encode() |
| 51 | + return u.String(), nil |
| 52 | +} |
| 53 | + |
| 54 | +func (c genericOauthClient) exchangeOauthCode(ctx context.Context, code string) (*TokenResponse, error) { |
| 55 | + form := url.Values{} |
| 56 | + form.Add("grant_type", "authorization_code") |
| 57 | + form.Add("redirect_uri", c.CallbackLocation) |
| 58 | + form.Add("scope", "read_user") |
| 59 | + form.Add("code", code) |
| 60 | + req, err := http.NewRequest("POST", c.ExchangeLocation, strings.NewReader(form.Encode())) |
| 61 | + if err != nil { |
| 62 | + return nil, err |
| 63 | + } |
| 64 | + req.WithContext(ctx) |
| 65 | + req.Header.Set("User-Agent", "writefreely") |
| 66 | + req.Header.Set("Accept", "application/json") |
| 67 | + req.Header.Set("Content-Type", "application/x-www-form-urlencoded") |
| 68 | + req.SetBasicAuth(c.ClientID, c.ClientSecret) |
| 69 | + |
| 70 | + resp, err := c.HttpClient.Do(req) |
| 71 | + if err != nil { |
| 72 | + return nil, err |
| 73 | + } |
| 74 | + if resp.StatusCode != http.StatusOK { |
| 75 | + return nil, errors.New("unable to exchange code for access token") |
| 76 | + } |
| 77 | + |
| 78 | + var tokenResponse TokenResponse |
| 79 | + if err := limitedJsonUnmarshal(resp.Body, tokenRequestMaxLen, &tokenResponse); err != nil { |
| 80 | + return nil, err |
| 81 | + } |
| 82 | + if tokenResponse.Error != "" { |
| 83 | + return nil, errors.New(tokenResponse.Error) |
| 84 | + } |
| 85 | + return &tokenResponse, nil |
| 86 | +} |
| 87 | + |
| 88 | +func (c genericOauthClient) inspectOauthAccessToken(ctx context.Context, accessToken string) (*InspectResponse, error) { |
| 89 | + req, err := http.NewRequest("GET", c.InspectLocation, nil) |
| 90 | + if err != nil { |
| 91 | + return nil, err |
| 92 | + } |
| 93 | + req.WithContext(ctx) |
| 94 | + req.Header.Set("User-Agent", "writefreely") |
| 95 | + req.Header.Set("Accept", "application/json") |
| 96 | + req.Header.Set("Authorization", "Bearer "+accessToken) |
| 97 | + |
| 98 | + resp, err := c.HttpClient.Do(req) |
| 99 | + if err != nil { |
| 100 | + return nil, err |
| 101 | + } |
| 102 | + if resp.StatusCode != http.StatusOK { |
| 103 | + return nil, errors.New("unable to inspect access token") |
| 104 | + } |
| 105 | + |
| 106 | + var inspectResponse InspectResponse |
| 107 | + if err := limitedJsonUnmarshal(resp.Body, infoRequestMaxLen, &inspectResponse); err != nil { |
| 108 | + return nil, err |
| 109 | + } |
| 110 | + if inspectResponse.Error != "" { |
| 111 | + return nil, errors.New(inspectResponse.Error) |
| 112 | + } |
| 113 | + return &inspectResponse, nil |
| 114 | +} |
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