Release v2.2.0

vendor/github.com/fiatjaf/go-lnurl/handle.go

@@ -0,0 +1,83 @@
+package lnurl
+
+import (
+	"errors"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/tidwall/gjson"
+)
+
+// HandleLNURL takes a bech32-encoded lnurl and either gets its parameters from the query-
+// string or calls the URL to get the parameters.
+// Returns a different struct for each of the lnurl subprotocols, the .LNURLKind() method of
+// which should be checked next to see how the wallet is going to proceed.
+func HandleLNURL(rawlnurl string) (string, LNURLParams, error) {
+	var err error
+	var rawurl string
+
+	if strings.HasPrefix(rawlnurl, "https:") {
+		rawurl = rawlnurl
+	} else {
+		lnurl, ok := FindLNURLInText(rawlnurl)
+		if !ok {
+			return "", nil, errors.New("invalid bech32-encoded lnurl: " + rawlnurl)
+		}
+		rawurl, err = LNURLDecode(lnurl)
+		if err != nil {
+			return "", nil, err
+		}
+	}
+
+	parsed, err := url.Parse(rawurl)
+	if err != nil {
+		return rawurl, nil, err
+	}
+
+	query := parsed.Query()
+
+	switch query.Get("tag") {
+	case "login":
+		value, err := HandleAuth(rawurl, parsed, query)
+		return rawurl, value, err
+	case "withdrawRequest":
+		if value, ok := HandleFastWithdraw(query); ok {
+			return rawurl, value, nil
+		}
+	}
+
+	resp, err := http.Get(rawurl)
+	if err != nil {
+		return rawurl, nil, err
+	}
+
+	b, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return rawurl, nil, err
+	}
+
+	j := gjson.ParseBytes(b)
+	if j.Get("status").String() == "ERROR" {
+		return rawurl, nil, LNURLErrorResponse{
+			URL:    parsed,
+			Reason: j.Get("reason").String(),
+			Status: "ERROR",
+		}
+	}
+
+	switch j.Get("tag").String() {
+	case "withdrawRequest":
+		value, err := HandleWithdraw(j)
+		return rawurl, value, err
+	case "payRequest":
+		value, err := HandlePay(j)
+		return rawurl, value, err
+	case "channelRequest":
+		value, err := HandleChannel(j)
+		return rawurl, value, err
+	default:
+		return rawurl, nil, errors.New("unknown response tag " + j.String())
+	}
+}