Redirect to start page if we were logged out.

Previously, Lychee simply stopped working if, e.g., our cookie
expired without letting the user know what went wrong. Now, the user
gets redirected to the start page instead.

This happens if:
1) viewing a private album/photo is denied in private mode
2) the requested function on the served doesn't exist

The second case can also happen due to a bug in Lychee, though.

src/scripts/album.js

@@ -49,6 +49,12 @@ album.load = function(albumID, refresh = false) {
 
 			if (data==='Warning: Album private!') {
 
+				// if we were in private mode, restart lychee. maybe the cookie has expired
+				if (!lychee.publicMode) {
+					lychee.restart()
+					return false
+				}
+
 				if (document.location.hash.replace('#', '').split('/')[1]!=undefined) {
 					// Display photo only
 					lychee.setMode('view')

src/scripts/lychee.js

@@ -144,6 +144,12 @@ lychee.logout = function() {
 
 }
 
+lychee.restart = function() {
+
+	document.location.href = ''
+
+}
+
 lychee.goto = function(url = '') {
 
 	url = '#' + url
@@ -418,6 +424,12 @@ lychee.html = function(literalSections, ...substs) {
 
 lychee.error = function(errorThrown, params, data) {
 
+	// if the requested function was not found, our cookie has probably expired
+	if (data.startsWith('Error: Function not found!')) {
+		lychee.restart()
+		return
+	}
+
 	console.error({
 		description : errorThrown,
 		params      : params,

src/scripts/photo.js

@@ -48,9 +48,17 @@ photo.load = function(photoID, albumID) {
 	api.post('Photo::get', params, function(data) {
 
 		if (data==='Warning: Photo private!') {
+
+			// if we were in private mode, restart lychee. maybe the cookie has expired
+			if (!lychee.publicMode) {
+				lychee.restart()
+				return false
+			}
+
 			lychee.content.show()
 			lychee.goto()
 			return false
+
 		}
 
 		if (data==='Warning: Wrong password!') {