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package mastodon
import (
"context"
"encoding/json"
"net/http"
"net/url"
"path"
"strings"
)
// AppConfig is a setting for registering applications.
type AppConfig struct {
Server string
ClientName string
// Where the user should be redirected after authorization (for no redirect, use urn:ietf:wg:oauth:2.0:oob)
RedirectURIs string
// This can be a space-separated list of items listed on the /settings/applications/new page of any Mastodon
// instance. "read", "write", and "follow" are top-level scopes that include all the permissions of the more
// specific scopes like "read:favourites", "write:statuses", and "write:follows".
Scopes string
// Optional.
Website string
}
// Application is mastodon application.
type Application struct {
ID string `json:"id"`
RedirectURI string `json:"redirect_uri"`
ClientID string `json:"client_id"`
ClientSecret string `json:"client_secret"`
// AuthURI is not part of the Mastodon API; it is generated by go-mastodon.
AuthURI string `json:"auth_uri,omitempty"`
}
// RegisterApp returns the mastodon application.
func RegisterApp(ctx context.Context, appConfig *AppConfig) (*Application, error) {
params := url.Values{}
params.Set("client_name", appConfig.ClientName)
if appConfig.RedirectURIs == "" {
params.Set("redirect_uris", "urn:ietf:wg:oauth:2.0:oob")
} else {
params.Set("redirect_uris", appConfig.RedirectURIs)
}
params.Set("scopes", appConfig.Scopes)
params.Set("website", appConfig.Website)
u, err := url.Parse(appConfig.Server)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, "/api/v1/apps")
req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(params.Encode()))
if err != nil {
return nil, err
}
req = req.WithContext(ctx)
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
resp, err := httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, parseAPIError("bad request", resp)
}
var app Application
err = json.NewDecoder(resp.Body).Decode(&app)
if err != nil {
return nil, err
}
u, err = url.Parse(appConfig.Server)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, "/oauth/authorize")
u.RawQuery = url.Values{
"scope": {appConfig.Scopes},
"response_type": {"code"},
"redirect_uri": {app.RedirectURI},
"client_id": {app.ClientID},
}.Encode()
app.AuthURI = u.String()
return &app, nil
}
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