From 6011221d0246ba587b412a8bd2047b53a067a542 Mon Sep 17 00:00:00 2001
From: papush
Date: Sun, 29 Aug 2021 16:02:25 +0200
Subject: clean up the preference migration code

---
 chrome/js/redirector.js | 80 +++++++++++++++++++++++++------------------------
 1 file changed, 41 insertions(+), 39 deletions(-)

diff --git a/chrome/js/redirector.js b/chrome/js/redirector.js
index b62c3da..11905a9 100644
--- a/chrome/js/redirector.js
+++ b/chrome/js/redirector.js
@@ -105,47 +105,49 @@ Redirector = {
 		return file;
 	},
 
-	handleUpgrades : function() {
-		AddonManager.getAddonByID("url-rewriter@papush", (addon) => {
-			currentVersion = '' + addon.version;
-			this._list = [];
-
-			if (this._prefs.version == currentVersion) {
-				this.debug("No version change, prefs migration skipped");
-				return;
+	// Return a list of Redirects read from a string.
+	//
+	// The string is expected to be in the format redirector used in
+	// older versions where it was stored as a user pref.
+	parseRedirectsString : function(data) {
+		let list = [];
+		for each (redirectString in data.split(':::')) {
+			if (!redirectString || !redirectString.split) {
+				this.debug('Invalid old redirect: ' + redirectString);
+				continue;
 			}
-			this.debug("Migrating prefs");
-			//Here update checks are handled
-
-			try {
-				var branch = PrefService.getBranch("extensions.redirector.");
-				var data = branch.getCharPref("redirects");
-			} catch(e) {
-				this._prefs.version = currentVersion;
-				return;
+			let parts = redirectString.split(',,,');
+			if (parts.length < 5) {
+				throw Error("Invalid serialized redirect, too few fields: " + redirectString);
 			}
-			var arr;
-			this._list = [];
-			if (data != '') {
-				for each (redirectString in data.split(':::')) {
-					if (!redirectString || !redirectString.split) {
-						continue;
-						this.debug('Invalid old redirect: ' + redirectString);
-					}
-					var parts = redirectString.split(',,,');
-					if (parts.length < 5) {
-						throw Error("Invalid serialized redirect, too few fields: " + redirectString);
-					}
-					var redirect = new Redirect();
-					redirect._init.apply(redirect, parts);
-					this._list.push(redirect);
-				}
-				this.save();
-				this._list = []; //Let the real loading start this properly
-			}
-			branch.deleteBranch('redirects');
-			this._prefs.version = currentVersion;
-		});
+			let redirect = new Redirect();
+			redirect._init.apply(redirect, parts);
+			list.push(redirect);
+		}
+		return list;
+	},
+
+	handleUpgrades : function() {
+		let branch, data;
+		try {
+			branch = PrefService.getBranch("extensions.redirector.");
+		 	data = branch.getCharPref("redirects");
+		} catch (e) {
+			this.debug("No legacy redirect string preference found");
+			return;
+		}
+		this.debug("Legacy redirect string preference found, migrating");
+		oldRedirects = this.parseRedirectsString(data);
+		if (!oldRedirects) {
+			throw Error("Failed to migrate redirects, this shouldn't happen, send hatemail to papush@deepzero.net");
+		}
+		let redirectsFile = this._getRedirectsFile();
+		if (redirectsFile.exists()) {
+			this.importRedirects(redirectsFile);
+		}
+		this._list = this._list.concat(oldRedirects);
+		this.save();
+		branch.deleteBranch('redirects');
 	},
 
 	importRedirects : function(file) {
-- 
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