Allow trusting self-signed certificates

README.md

@@ -353,6 +353,7 @@ uri: https://volkszaehler/api/data/<uuid>.json?from=now
 method: GET # default HTTP method
 headers:
 - content-type: application/json
+insecure: false # set to true to trust self-signed certificates
 jq: .data.tuples[0][1] # parse response json
 scale: 0.001 # floating point factor applied to result, e.g. for kW to W conversion
 ```

provider/http.go

@@ -1,6 +1,7 @@
 package provider
 
 import (
+	"crypto/tls"
 	"fmt"
 	"io"
 	"math"
@@ -32,6 +33,7 @@ func NewHTTPProviderFromConfig(log *util.Logger, other map[string]interface{}) *
 		Body        string
 		Jq          string
 		Scale       float64
+		Insecure    bool
 	}{}
 	util.DecodeOther(log, other, &cc)
 
@@ -47,6 +49,13 @@ func NewHTTPProviderFromConfig(log *util.Logger, other map[string]interface{}) *
 		scale:      cc.Scale,
 	}
 
+	// ignore the self signed certificate
+	if cc.Insecure {
+		customTransport := http.DefaultTransport.(*http.Transport).Clone()
+		customTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
+		p.HTTPHelper.Client.Transport = customTransport
+	}
+
 	if cc.Jq != "" {
 		op, err := gojq.Parse(cc.Jq)
 		if err != nil {