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feat(example): Allow configuring some parameters with env variables
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Andrey Rusakov
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Oct 9, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| const ( | ||
| // default port for the http server to run | ||
| DefaultIssuerPort = "9998" | ||
| ) | ||
|
|
||
| type Config struct { | ||
| Port string | ||
| RedirectURIs []string | ||
| UsersFile string | ||
| } | ||
|
|
||
| // FromEnvVars loads configuration parameters from environment variables. | ||
| // If there is no such variable defined, then use default values. | ||
| func FromEnvVars(defaults *Config) *Config { | ||
| if defaults == nil { | ||
| defaults = &Config{} | ||
| } | ||
| cfg := &Config{ | ||
| Port: defaults.Port, | ||
| RedirectURIs: defaults.RedirectURIs, | ||
| UsersFile: defaults.UsersFile, | ||
| } | ||
| if value, ok := os.LookupEnv("PORT"); ok { | ||
| cfg.Port = value | ||
| } | ||
| if value, ok := os.LookupEnv("USERS_FILE"); ok { | ||
| cfg.UsersFile = value | ||
| } | ||
| if value, ok := os.LookupEnv("REDIRECT_URIS"); ok { | ||
| cfg.RedirectURIs = strings.Split(value, ",") | ||
| } | ||
| return cfg | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestFromEnvVars(t *testing.T) { | ||
|
|
||
| for _, tc := range []struct { | ||
| name string | ||
| env map[string]string | ||
| defaults *Config | ||
| want *Config | ||
| }{ | ||
| { | ||
| name: "no vars, no default values", | ||
| env: map[string]string{}, | ||
| want: &Config{}, | ||
| }, | ||
| { | ||
| name: "no vars, only defaults", | ||
| env: map[string]string{}, | ||
| defaults: &Config{ | ||
| Port: "6666", | ||
| UsersFile: "/default/user/path", | ||
| RedirectURIs: []string{"re", "direct", "uris"}, | ||
| }, | ||
| want: &Config{ | ||
| Port: "6666", | ||
| UsersFile: "/default/user/path", | ||
| RedirectURIs: []string{"re", "direct", "uris"}, | ||
| }, | ||
| }, | ||
| { | ||
| name: "overriding default values", | ||
| env: map[string]string{ | ||
| "PORT": "1234", | ||
| "USERS_FILE": "/path/to/users", | ||
| "REDIRECT_URIS": "http://redirect/redirect", | ||
| }, | ||
| defaults: &Config{ | ||
| Port: "6666", | ||
| UsersFile: "/default/user/path", | ||
| RedirectURIs: []string{"re", "direct", "uris"}, | ||
| }, | ||
| want: &Config{ | ||
| Port: "1234", | ||
| UsersFile: "/path/to/users", | ||
| RedirectURIs: []string{"http://redirect/redirect"}, | ||
| }, | ||
| }, | ||
| { | ||
| name: "multiple redirect uris", | ||
| env: map[string]string{ | ||
| "REDIRECT_URIS": "http://host_1,http://host_2,http://host_3", | ||
| }, | ||
| want: &Config{ | ||
| RedirectURIs: []string{ | ||
| "http://host_1", "http://host_2", "http://host_3", | ||
| }, | ||
| }, | ||
| }, | ||
| } { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| os.Clearenv() | ||
| for k, v := range tc.env { | ||
| os.Setenv(k, v) | ||
| } | ||
| cfg := FromEnvVars(tc.defaults) | ||
| if fmt.Sprint(cfg) != fmt.Sprint(tc.want) { | ||
| t.Errorf("Expected FromEnvVars()=%q, but got %q", tc.want, cfg) | ||
| } | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package storage | ||
|
|
||
| import ( | ||
| "os" | ||
| "path" | ||
| "reflect" | ||
| "testing" | ||
|
|
||
| "golang.org/x/text/language" | ||
| ) | ||
|
|
||
| func TestStoreFromFile(t *testing.T) { | ||
| for _, tc := range []struct { | ||
| name string | ||
| pathToFile string | ||
| content string | ||
| want UserStore | ||
| wantErr bool | ||
| }{ | ||
| { | ||
| name: "normal user file", | ||
| pathToFile: "userfile.json", | ||
| content: `{ | ||
| "id1": { | ||
| "ID": "id1", | ||
| "EmailVerified": true, | ||
| "PreferredLanguage": "DE" | ||
| } | ||
| }`, | ||
| want: userStore{map[string]*User{ | ||
| "id1": { | ||
| ID: "id1", | ||
| EmailVerified: true, | ||
| PreferredLanguage: language.German, | ||
| }, | ||
| }}, | ||
| }, | ||
| { | ||
| name: "malformed file", | ||
| pathToFile: "whatever", | ||
| content: "not a json just a text", | ||
| wantErr: true, | ||
| }, | ||
| { | ||
| name: "not existing file", | ||
| pathToFile: "what/ever/file", | ||
| wantErr: true, | ||
| }, | ||
| } { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| actualPath := path.Join(t.TempDir(), tc.pathToFile) | ||
|
|
||
| if tc.content != "" && tc.pathToFile != "" { | ||
| if err := os.WriteFile(actualPath, []byte(tc.content), 0666); err != nil { | ||
| t.Fatalf("cannot create file with test content: %q", tc.content) | ||
| } | ||
| } | ||
| result, err := StoreFromFile(actualPath) | ||
| if err != nil && !tc.wantErr { | ||
| t.Errorf("StoreFromFile(%q) returned unexpected error %q", tc.pathToFile, err) | ||
| } else if err == nil && tc.wantErr { | ||
| t.Errorf("StoreFromFile(%q) did not return an expected error", tc.pathToFile) | ||
| } | ||
| if !tc.wantErr && !reflect.DeepEqual(tc.want, result.(userStore)) { | ||
| t.Errorf("expected StoreFromFile(%q) = %v, but got %v", | ||
| tc.pathToFile, tc.want, result) | ||
| } | ||
| }) | ||
| } | ||
| } |