Add Frauenhofer ISE energy-charts-api | day ahead price (#13706)

main.go

@@ -12,10 +12,10 @@ import (
 )
 
 var (
-	//go:embed dist
+	// go:embed dist
 	web embed.FS
 
-	//go:embed i18n/*.toml
+	// go:embed i18n/*.toml
 	i18n embed.FS
 )
 

provider/http.go

@@ -6,8 +6,10 @@ import (
 	"math"
 	"strconv"
 	"strings"
+	"text/template"
 	"time"
 
+	"github.com/42atomys/sprout"
 	"github.com/evcc-io/evcc/provider/pipeline"
 	"github.com/evcc-io/evcc/util"
 	"github.com/evcc-io/evcc/util/request"
@@ -162,8 +164,18 @@ func (p *HTTP) request(url string, body ...string) ([]byte, error) {
 			b = strings.NewReader(body[0])
 		}
 
+		tmpl, err := template.New("url").Funcs(sprout.TxtFuncMap()).Parse(url)
+		if err != nil {
+			return nil, err
+		}
+
+		builder := new(strings.Builder)
+		if err := tmpl.Execute(builder, nil); err != nil {
+			return nil, err
+		}
+
 		// empty method becomes GET
-		req, err := request.New(strings.ToUpper(p.method), url, b, p.headers)
+		req, err := request.New(strings.ToUpper(p.method), builder.String(), b, p.headers)
 		if err != nil {
 			return []byte{}, err
 		}

templates/definition/tariff/energy-charts-api.yaml

@@ -0,0 +1,41 @@
+template: energy-charts-api
+products:
+  - brand: Fraunhofer ISE
+    description:
+      de: "Day-ahead Energiepreise (je kWh) an der Börse. Kann ohne vorherige Anmeldung auf https://api.energy-charts.info/ abgerufen werden. Nutzbar u.a. für dynamische Stromtarife, wo der Anbieter bis dato auf der Kundenschnittstelle noch kein Preis-Vorhersagen anbietet."
+      en: "Day-ahead forecast of energy prices (per kWh) on the exchange. No prior registration for https://api.energy-charts.info/ necessary. Can be used for dynamic electricity tariffs, for example, where the supplier does not yet offer a price forecast on the customer interface."
+params:
+  - name: bzn
+    type: string
+    required: true
+    validvalues:
+      [
+        "AT",
+        "BE",
+        "CH",
+        "CZ",
+        "DE-LU",
+        "DE-AT-LU",
+        "DK1",
+        "DK2",
+        "FR",
+        "HU",
+        "IT-NORTH",
+        "NL",
+        "NO2",
+        "PL",
+        "SE4",
+        "SI",
+      ]
+    default: DE-LU
+    description:
+      de: "Gebotszonen - https://api.energy-charts.info/#/prices/day_ahead_price_price_get"
+      en: "Bidding zones - https://api.energy-charts.info/#/prices/day_ahead_price_price_get"
+  - preset: tariff-base
+render: |
+  type: custom
+  {{ include "tariff-base" . }}
+  forecast:
+    source: http
+    uri: https://api.energy-charts.info/price?bzn={{ .bzn }}&end={{ now | dateModify "+24h" | date "2006-01-02" }}
+    jq: '[.unix_seconds, .price] | transpose | map({ "start": (.[0] | todate), "end": ((.[0]+3600) | todate), "price": (.[1]/1000)}) | tostring'