Add LiberaPay support

Signed-off-by: Knut Ahlers <knut@ahlers.me>

service_liberapay.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/Luzifer/go_helpers/str"
+	"golang.org/x/net/context"
+)
+
+func init() {
+	registerServiceHandler("liberapay", liberapayServiceHandler{})
+}
+
+type liberapayPublicProfile struct {
+	Giving *struct {
+		Amount   float64 `json:"amount,string"`
+		Currency string  `json:"currency"`
+	} `json:"giving"`
+	Receiving *struct {
+		Amount   float64 `json:"amount,string"`
+		Currency string  `json:"currency"`
+	} `json:"receiving"`
+}
+
+type liberapayServiceHandler struct{}
+
+func (s liberapayServiceHandler) GetDocumentation() serviceHandlerDocumentationList {
+	return serviceHandlerDocumentationList{
+		{
+			ServiceName: "LiberaPay Amount Receiving",
+			DemoPath:    "/liberapay/liberapay/receiving",
+			Arguments:   []string{"<user>", "receiving"},
+		},
+		{
+			ServiceName: "LiberaPay Amount Giving",
+			DemoPath:    "/liberapay/Nutomic/giving",
+			Arguments:   []string{"<user>", "giving"},
+		},
+	}
+}
+
+func (s liberapayServiceHandler) Handle(ctx context.Context, params []string) (title, text, color string, err error) {
+	if len(params) < 2 {
+		err = errors.New("You need to provide user and payment direction")
+		return
+	}
+
+	if !str.StringInSlice(params[1], []string{"receiving", "giving"}) {
+		err = fmt.Errorf("%q is an invalid payment direction", params[1])
+		return
+	}
+
+	title = params[1]
+	color = "ffee16"
+
+	cacheKey := strings.Join([]string{params[0], params[1]}, ":")
+	text, err = cacheStore.Get("liberapay", cacheKey)
+
+	if err != nil {
+		req, _ := http.NewRequest("GET", fmt.Sprintf("https://liberapay.com/%s/public.json", params[0]), nil)
+
+		var resp *http.Response
+		resp, err = http.DefaultClient.Do(req.WithContext(ctx))
+		if err != nil {
+			return
+		}
+		defer resp.Body.Close()
+
+		r := liberapayPublicProfile{}
+		if err = json.NewDecoder(resp.Body).Decode(&r); err != nil {
+			return
+		}
+
+		switch params[1] {
+		case "receiving":
+			if r.Receiving == nil {
+				text = "hidden"
+			} else {
+				text = fmt.Sprintf("%.2f %s", r.Receiving.Amount, r.Receiving.Currency)
+			}
+		case "giving":
+			if r.Giving == nil {
+				text = "hidden"
+			} else {
+				text = fmt.Sprintf("%.2f %s", r.Giving.Amount, r.Giving.Currency)
+			}
+		}
+
+		cacheStore.Set("liberapay", cacheKey, text, 60*time.Minute)
+	}
+
+	return
+}