Webfinger + Small fixes (#20)

internal/api/s2s/webfinger/webfingerget.go

@@ -0,0 +1,68 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package webfinger
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// WebfingerGETRequest handles requests to, for example, https://example.org/.well-known/webfinger?resource=acct:some_user@example.org
+func (m *Module) WebfingerGETRequest(c *gin.Context) {
+
+	q, set := c.GetQuery("resource")
+	if !set || q == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no 'resource' in request query"})
+		return
+	}
+
+	withAcct := strings.Split(q, "acct:")
+	if len(withAcct) != 2 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "bad request"})
+		return
+	}
+
+	usernameDomain := strings.Split(withAcct[1], "@")
+	if len(usernameDomain) != 2 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "bad request"})
+		return
+	}
+	username := strings.ToLower(usernameDomain[0])
+	domain := strings.ToLower(usernameDomain[1])
+	if username == "" || domain == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "bad request"})
+		return
+	}
+
+	if domain != m.config.Host {
+		c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("domain %s does not belong to this instance", domain)})
+		return
+	}
+
+	resp, err := m.processor.GetWebfingerAccount(username, c.Request)
+	if err != nil {
+		c.JSON(err.Code(), gin.H{"error": err.Safe()})
+		return
+	}
+
+	c.JSON(http.StatusOK, resp)
+}