docs: Improve log output for missing config

Fix #33

README.md

@@ -3,7 +3,7 @@
 `spaceapid` serves a [SpaceAPI](https://spaceapi.io)-compatible JSON on port 8080:
 
 ```shell
-$ curl http://[::1]:8080 | jq
+$ curl http://localhost:8080 | jq
 {
   "api_compatibility": [
     "14"
@@ -28,38 +28,50 @@ The config consists of three parts:
 
 See [Running](#Running) for details.
 
-## Updating values
-
-The state of the boolean `state->open` property can be modified via `/state/open`:
-
-```shell
-curl -X PUT -u user:password -d true http://[::1]:8080/state/open
-```
-
-The same is true for the endpoints for sensors configured under `"dynamic"`.
-Currently only the sensors with the `value/unit/location/name/description` schema are implemented.
-At the time of writing this includes `temperature`, `barometer`, `humidity`, `beverage_supply`, `power_consumption`,
-and `account_balance`.
-Out-of-spec sensors may also be used as long as they share the same schema.
-
-```shell
-curl -X PUT -u user:password -d 23.42 http://[::1]:8080/sensors/{temperature,humidity,...}[/location[/name]]
-```
-
-As can be seen in the example, the http urls are generated from sensor type and optionally `location` and `name`.
-Depending on sensor type `location` might be required for your sensors, see the schema for details.
-
 ## Building
 
 See the `go.mod` file for minimum required Go version.
 There are currently no dependencies apart from the Go standard library.
 
+``` shell
+go build -ldflags '-X main.version=v420.69-rc23' .
+```
+
 ## Running
 
 Set the environment variable to a comma-separated list of config files or pass the `-c` flag.
 
 ```shell
-env CONFIG_PATH=config-template.json go run .
+env SPACEAPID_CONFIG_PATH=config-template.json go run .
 # OR
 go run . -c config-credentials.json,config-dynamic.json,config-response.json
 ```
+
+## Updating values
+
+The state of the boolean `state->open` and `state->message` property can be modified via `/state/{open,message}`:
+
+```shell
+curl -X PUT -u user:password -d true http://localhost:8080/state/open
+curl -X PUT -u user:password -d "Nur mit Passierschein A38 :3" http://localhost:8080/state/message
+```
+
+As `state->message` is optional, its value can be deleted by using the `PUT` method with an empty payload, or by using `DELETE`:
+
+```shell
+curl -X PUT -u user:password -d "" http://localhost:8080/state/message
+# OR
+curl -X DELETE -u user:password http://localhost:8080/state/message
+```
+
+The same updating procedure applies for the endpoints for sensors configured under `"dynamic"`.
+Currently only the sensors with the `value/unit/location/name/description` schema are implemented.
+At the time of writing this includes `temperature`, `barometer`, `humidity`, `beverage_supply`, `power_consumption`, and `account_balance`.
+Out-of-spec sensors may be used as well, as long as they share the same schema.
+
+```shell
+curl -X PUT -u user:password -d 23.42 http://localhost:8080/sensors/{temperature,humidity,...}[/location[/name]]
+```
+
+As can be seen in the example, the http urls are generated from sensor type and optionally `location` and `name`.
+Depending on sensor type, `location` might be required for your sensors, see the schema for details.

config/config.go

@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	envConfigPath = "CONFIG_PATH"
+	envConfigPath = "SPACEAPID_CONFIG_PATH"
 )
 
 type pathsT []string
@@ -59,7 +59,7 @@ func getConfigPaths() (paths pathsT) {
 
 	// If paths is still empty we are missing something
 	if len(paths) == 0 {
-		log.Fatalln("Neither the env variable nor cli flag was specified, we are missing a config file.")
+		log.Fatalln("Error: Neither env: ", envConfigPath, "nor cli flag was specified, unable to start without config.")
 	}
 	return
 }
@@ -91,7 +91,7 @@ func ParseConfiguration() (conf SpaceapidConfig) {
 		log.Fatalln("Provided file doesn't specify compatibility with API version 14")
 	}
 
-	// Initialise fields for environment sensors
+	// Initialize fields for environment sensors
 	conf.Response.Sensors = make(map[string][]types.EnvironmentSensor)
 	for key, sensorConfigs := range conf.Dynamic.Sensors {
 		conf.Response.Sensors[key] = make([]types.EnvironmentSensor, len(sensorConfigs))

go.mod

@@ -1,3 +1,3 @@
 module git.hamburg.ccc.de/ccchh/spaceapid
 
-go 1.21
+go 1.22

handlers/state.go

@@ -34,3 +34,37 @@ func StateOpen(
 		resp.LastChange = time.Now().Unix()
 	}
 }
+
+func StateMessagePUT(
+	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID,
+	resp *types.SpaceState,
+) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		body, err := updateEndpointValidator(authDB, validCredentials, w, r)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+
+		// Set SpaceAPI response values
+		resp.Message = string(body)
+		resp.LastChange = time.Now().Unix()
+	}
+}
+
+func StateMessageDELETE(
+	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID,
+	resp *types.SpaceState,
+) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		_, err := updateEndpointValidator(authDB, validCredentials, w, r)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+
+		// Set SpaceAPI response values
+		resp.Message = ""
+		resp.LastChange = time.Now().Unix()
+	}
+}

handlers/util.go

@@ -10,8 +10,7 @@ import (
 	"git.hamburg.ccc.de/ccchh/spaceapid/util"
 )
 
-// updateEndpointValidator checks BasicAuth credentials,
+// updateEndpointValidator checks BasicAuth credentials and then returns the request body
-// checks for correct HTTP method and then returns the request body
 func updateEndpointValidator(
 	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID,
 	w http.ResponseWriter, r *http.Request,
@@ -24,13 +23,6 @@ func updateEndpointValidator(
 		return []byte{}, errors.New(fmt.Sprintf("Unauthorized request from %s Username: %s Password: %s", r.RemoteAddr, username, password))
 	}
 
-	// Check if PUT method
-	if r.Method != http.MethodPut {
-		w.Header().Set("Allow", http.MethodPut)
-		http.Error(w, "", http.StatusMethodNotAllowed)
-		return []byte{}, errors.New(fmt.Sprintf("Wrong Method: %s from %s at %s", r.Method, r.RemoteAddr, r.RequestURI))
-	}
-
 	// Read request body
 	body, err := io.ReadAll(r.Body)
 	if err != nil {

main.go

@@ -50,21 +50,29 @@ func main() {
 		os.Exit(0)
 	}(&conf.Response)
 
-	// Register HTTP handlers
+	// Root handler
-	http.HandleFunc("/",
+	http.HandleFunc("GET /{$}",
 		handlers.Root(&conf.Response),
 	)
-	http.HandleFunc("/state/open",
+	// state->open
+	http.HandleFunc("PUT /state/open",
 		handlers.StateOpen(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
 	)
-	// Register handlers for Environmental Sensors
+	// state->message
+	http.HandleFunc("PUT /state/message",
+		handlers.StateMessagePUT(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
+	)
+	http.HandleFunc("DELETE /state/message",
+		handlers.StateMessageDELETE(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
+	)
+	// Register handlers for environmental sensors
 	for sensorType, envSensorConfigs := range conf.Dynamic.Sensors {
 		for i, envSensorConfig := range envSensorConfigs {
-			urlPath := util.GetSensorURLPath(
+			urlPattern := "PUT " + util.GetSensorURLPath(
 				sensorType, envSensorConfig.SensorData.Location, envSensorConfig.SensorData.Name,
 			)
 			http.HandleFunc(
-				urlPath,
+				urlPattern,
 				handlers.EnvironmentSensor(
 					conf.Credentials, envSensorConfig.AllowedCredentials, &conf.Response.Sensors[sensorType][i],
 				),

persistence/persistentState.go

@@ -89,9 +89,10 @@ func SaveCurrentState(response types.SpaceAPIResponseV14) {
 	// Create persistent state
 	persistentStateV14 := types.PersistentStateV14{
 		State: struct {
-			Open       bool  `json:"open"`
+			Open       bool   `json:"open"`
-			LastChange int64 `json:"lastchange"`
+			LastChange int64  `json:"lastchange"`
-		}{Open: response.State.Open, LastChange: response.State.LastChange},
+			Message    string `json:"message,omitempty"`
+		}{Open: response.State.Open, LastChange: response.State.LastChange, Message: response.State.Message},
 	}
 	// Save sensor state
 	persistentStateV14.Sensors = make(map[string][]types.PersistentEnvironmentSensor)

types/v14.go

@@ -38,8 +38,9 @@ type SpaceAPIResponseV14 struct {
 }
 
 type SpaceState struct {
-	Open       bool  `json:"open"`
+	Open       bool   `json:"open"`
-	LastChange int64 `json:"lastchange"`
+	LastChange int64  `json:"lastchange"`
+	Message    string `json:"message,omitempty"`
 }
 
 type EnvironmentSensor struct {
@@ -53,8 +54,9 @@ type EnvironmentSensor struct {
 
 type PersistentStateV14 struct {
 	State struct {
-		Open       bool  `json:"open"`
+		Open       bool   `json:"open"`
-		LastChange int64 `json:"lastchange"`
+		LastChange int64  `json:"lastchange"`
+		Message    string `json:"message,omitempty"`
 	} `json:"state"`
 	Sensors map[string][]PersistentEnvironmentSensor `json:"sensors,omitempty"`
 }