NewHandler creates a new handler from the given HandlerConfig. Two exceptions apply to the HandlerConfig documentation: NewHandler does not create default values for Prefix and ServerBaseURL. Prefix should be provided, and ServerBaseURL might be needed, depending on the other fields.
(cfg HandlerConfig)
| 356 | // values for Prefix and ServerBaseURL. Prefix should be provided, and |
| 357 | // ServerBaseURL might be needed, depending on the other fields. |
| 358 | func NewHandler(cfg HandlerConfig) (*Handler, error) { |
| 359 | if cfg.Program == "" { |
| 360 | return nil, fmt.Errorf("app: could not initialize Handler: empty Program") |
| 361 | } |
| 362 | name := cfg.Program |
| 363 | |
| 364 | if cfg.Prefix == "" { |
| 365 | return nil, fmt.Errorf("app: could not initialize Handler for %q: empty Prefix", name) |
| 366 | } |
| 367 | |
| 368 | listen, backendURL, apiHost := cfg.Listen, cfg.BackendURL, cfg.APIHost |
| 369 | var err error |
| 370 | if listen == "" { |
| 371 | serverListen := cfg.ServerListen |
| 372 | if serverListen == "" { |
| 373 | if cfg.ServerBaseURL == "" { |
| 374 | return nil, fmt.Errorf(`app: could not initialize Handler for %q: "Listen", "ServerListen" and "ServerBaseURL" all undefined`, name) |
| 375 | } |
| 376 | parsedUrl, err := url.Parse(cfg.ServerBaseURL) |
| 377 | if err != nil { |
| 378 | return nil, fmt.Errorf("app: could not initialize Handler for %q: unparseable ServerBaseURL %q: %v", name, cfg.ServerBaseURL, err) |
| 379 | } |
| 380 | serverListen = parsedUrl.Host |
| 381 | } |
| 382 | listen, err = randListen(serverListen) |
| 383 | if err != nil { |
| 384 | return nil, err |
| 385 | } |
| 386 | } |
| 387 | if backendURL == "" { |
| 388 | if cfg.ServerBaseURL == "" { |
| 389 | return nil, fmt.Errorf(`app: could not initialize Handler for %q: neither "BackendURL" or "ServerBaseURL" defined`, name) |
| 390 | } |
| 391 | backendURL, err = baseURL(cfg.ServerBaseURL, listen) |
| 392 | if err != nil { |
| 393 | return nil, err |
| 394 | } |
| 395 | } |
| 396 | if apiHost == "" { |
| 397 | if cfg.ServerBaseURL == "" { |
| 398 | return nil, fmt.Errorf(`app: could not initialize Handler for %q: neither "APIHost" or "ServerBaseURL" defined`, name) |
| 399 | } |
| 400 | apiHost = cfg.ServerBaseURL + "/" |
| 401 | } |
| 402 | |
| 403 | proxyURL, err := url.Parse(backendURL) |
| 404 | if err != nil { |
| 405 | return nil, fmt.Errorf("could not parse backendURL %q: %v", backendURL, err) |
| 406 | } |
| 407 | |
| 408 | username, password := auth.RandToken(20), auth.RandToken(20) |
| 409 | camliAuth := username + ":" + password |
| 410 | basicAuth := auth.NewBasicAuth(username, password) |
| 411 | envVars := map[string]string{ |
| 412 | "CAMLI_API_HOST": apiHost, |
| 413 | "CAMLI_AUTH": camliAuth, |
| 414 | "CAMLI_APP_LISTEN": listen, |
| 415 | } |
no test coverage detected