add basic REST APIs for data retention

Fixes #495

httpd/api_retention.go

@@ -0,0 +1,44 @@
+package httpd
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/go-chi/render"
+
+	"github.com/drakkan/sftpgo/v2/common"
+	"github.com/drakkan/sftpgo/v2/dataprovider"
+)
+
+func getRetentionChecks(w http.ResponseWriter, r *http.Request) {
+	r.Body = http.MaxBytesReader(w, r.Body, maxRequestSize)
+	render.JSON(w, r, common.RetentionChecks.Get())
+}
+
+func startRetentionCheck(w http.ResponseWriter, r *http.Request) {
+	r.Body = http.MaxBytesReader(w, r.Body, maxRequestSize)
+	username := getURLParam(r, "username")
+	user, err := dataprovider.UserExists(username)
+	if err != nil {
+		sendAPIResponse(w, r, err, "", getRespStatus(err))
+		return
+	}
+	var check common.RetentionCheck
+	err = render.DecodeJSON(r.Body, &check.Folders)
+	if err != nil {
+		sendAPIResponse(w, r, err, "", http.StatusBadRequest)
+		return
+	}
+	if err := check.Validate(); err != nil {
+		sendAPIResponse(w, r, err, "Invalid folders to check", http.StatusBadRequest)
+		return
+	}
+	c := common.RetentionChecks.Add(check, &user)
+	if c == nil {
+		sendAPIResponse(w, r, err, fmt.Sprintf("Another check is already in progress for user %#v", username),
+			http.StatusConflict)
+		return
+	}
+	go c.Start()
+	sendAPIResponse(w, r, err, "Check started", http.StatusAccepted)
+}