Slashes not allowed in MXID

src/d2m/converters/user-to-mxid.js

@@ -20,10 +20,10 @@ const SPECIAL_USER_MAPPINGS = new Map([
 function downcaseUsername(user) {
 	// First, try to convert the username to the set of allowed characters
 	let downcased = user.username.toLowerCase()
-		// spaces to underscores...
-		.replace(/ /g, "_")
+		// spaces and slashes to underscores...
+		.replace(/[ /]/g, "_")
 		// remove disallowed characters...
-		.replace(/[^a-z0-9._=/-]*/g, "")
+		.replace(/[^a-z0-9._=-]*/g, "")
 		// remove leading and trailing dashes and underscores...
 		.replace(/(?:^[_-]*|[_-]*$)/g, "")
 	// If requested, also make the Discord user ID part of the username

src/d2m/converters/user-to-mxid.test.js

@@ -21,8 +21,12 @@ test("user2name: works on single emoji at the end", t => {
    t.equal(userToSimName({username: "Melody 🎵", discriminator: "2192"}), "melody")
 })
 
-test("user2name: works on crazy name", t => {
-   t.equal(userToSimName({username: "*** D3 &W (89) _7//-", discriminator: "0001"}), "d3_w_89__7//")
+test("user2name: works on really weird name", t => {
+   t.equal(userToSimName({username: "*** D3 &W (89) _7//-", discriminator: "0001"}), "d3_w_89__7")
+})
+
+test("user2name: treats slashes", t => {
+	t.equal(userToSimName({username: "Evil Lillith (she/her)", discriminator: "5892"}), "evil_lillith_she_her")
 })
 
 test("user2name: adds discriminator if name is unavailable (old tag format)", t => {

src/db/migrations/0034-slash-not-allowed-in-mxid.sql

@@ -0,0 +1,5 @@
+BEGIN TRANSACTION;
+
+DELETE FROM sim WHERE sim_name like '%/%';
+
+COMMIT;