Generate invite codes

src/main/api.zig

@@ -15,6 +15,9 @@ const pw_hash_buf_size = 128;
 const token_len = 20;
 const token_str_len = std.base64.standard.Encoder.calcSize(token_len);
 
+const invite_code_len = 16;
+const invite_code_str_len = std.base64.url_safe.Encoder.calcSize(invite_code_len);
+
 // Frees an api struct and its fields allocated from alloc
 pub fn free(alloc: std.mem.Allocator, val: anytype) void {
     switch (@typeInfo(@TypeOf(val))) {
@@ -291,5 +294,49 @@ fn ApiConn(comptime DbConn: type) type {
                 .value = token,
             };
         }
+
+        const InviteOptions = struct {
+            name: []const u8 = "",
+            max_uses: ?i64 = null,
+            lifetime: ?i64 = null, // unix seconds, TODO make a TimeSpan type
+        };
+        pub fn createInvite(self: *Self, options: InviteOptions) !models.Invite {
+            const id = Uuid.randV4(prng.random());
+
+            const user_id = (try self.getAuthenticatedUser()).id;
+
+            var code: [invite_code_len]u8 = undefined;
+            std.crypto.random.bytes(&code);
+
+            var code_str = try self.arena.allocator().alloc(u8, invite_code_str_len);
+            _ = std.base64.url_safe.Encoder.encode(code_str, &code);
+
+            const now = DateTime.now();
+            const expires_at = if (options.lifetime) |lifetime| DateTime{
+                .seconds_since_epoch = lifetime + now.seconds_since_epoch,
+            } else null;
+
+            const invite = models.Invite{
+                .id = id,
+
+                .name = try self.arena.allocator().dupe(u8, options.name),
+                .created_by = user_id,
+                .invite_code = code_str,
+
+                .uses = 0,
+                .max_uses = options.max_uses,
+
+                .created_at = now,
+                .expires_at = expires_at,
+            };
+
+            try self.db.insert(models.Invite, invite);
+
+            return invite;
+        }
+
+        pub fn getInvite(self: *Self, id: Uuid) !?models.Invite {
+            return self.db.getBy(models.Invite, .id, id, self.arena.allocator());
+        }
     };
 }

src/main/controllers.zig

@@ -8,6 +8,9 @@ const Uuid = @import("util").Uuid;
 pub const auth = @import("./controllers/auth.zig");
 pub const notes = @import("./controllers/notes.zig");
 pub const actors = @import("./controllers/actors.zig");
+pub const admin = struct {
+    pub const invites = @import("./controllers/admin/invites.zig");
+};
 
 pub const utils = struct {
     const json_options = if (builtin.mode == .Debug) .{

src/main/controllers/admin/invites.zig

@@ -0,0 +1,29 @@
+const root = @import("root");
+const http = @import("http");
+const Uuid = @import("util").Uuid;
+
+const utils = @import("../../controllers.zig").utils;
+const NoteCreateInfo = @import("../../api.zig").NoteCreateInfo;
+
+const RequestServer = root.RequestServer;
+const RouteArgs = http.RouteArgs;
+
+pub fn create(srv: *RequestServer, ctx: *http.server.Context, _: RouteArgs) !void {
+    var api = try utils.getApiConn(srv, ctx);
+    defer api.close();
+
+    const invite = try api.createInvite(.{});
+
+    try utils.respondJson(ctx, .created, invite);
+}
+
+pub fn get(srv: *RequestServer, ctx: *http.server.Context, args: RouteArgs) !void {
+    const id_str = args.get("id") orelse return error.NotFound;
+    const id = Uuid.parse(id_str) catch return utils.respondError(ctx, .bad_request, "Invalid UUID");
+    var api = try utils.getApiConn(srv, ctx);
+    defer api.close();
+
+    const invite = (try api.getInvite(id)) orelse return utils.respondError(ctx, .not_found, "Invite not found");
+
+    try utils.respondJson(ctx, .ok, invite);
+}

src/main/db.zig

@@ -15,6 +15,7 @@ fn tableName(comptime T: type) String {
         models.Reaction => "reaction",
         models.LocalUser => "local_user",
         models.Token => "token",
+        models.Invite => "invite",
         else => unreachable,
     };
 }
@@ -203,6 +204,21 @@ pub const Database = struct {
         \\
         \\  PRIMARY KEY(id)
         \\) STRICT;
+        ,
+        \\CREATE TABLE IF NOT EXISTS
+        \\invite(
+        \\  id TEXT NOT NULL PRIMARY KEY,
+        \\
+        \\  name TEXT NOT NULL,
+        \\  invite_code TEXT NOT NULL,
+        \\  created_by TEXT NOT NULL REFERENCES local_user(id),
+        \\
+        \\  uses INTEGER NOT NULL,
+        \\  max_uses INTEGER,
+        \\
+        \\  created_at INTEGER NOT NULL,
+        \\  expires_at INTEGER
+        \\) STRICT;
     };
 
     pub fn init() !Database {

src/main/db/models.zig

@@ -20,6 +20,18 @@ pub fn ByteArray(comptime n: usize) type {
             _ = try row.getBlob(idx, &self.data);
             return self;
         }
+
+        pub fn format(self: Self, comptime _: []const u8, _: std.fmt.FormatOptions, writer: anytype) !void {
+            const Encoder = std.base64.standard.Encoder;
+            const buf_len = comptime Encoder.calcSize(n);
+            var buf: [buf_len]u8 = undefined;
+            const str = Encoder.encode(&buf, &self.data);
+            try std.fmt.format(writer, "{s}", .{str});
+        }
+
+        pub fn stringifyJson(self: Self, _: std.json.StringifyOptions, writer: anytype) !void {
+            try self.format("{}", .{}, writer);
+        }
     };
 }
 
@@ -90,3 +102,17 @@ pub const Token = struct {
     user_id: Ref(LocalUser),
     issued_at: DateTime,
 };
+
+pub const Invite = struct {
+    id: Uuid,
+
+    name: []const u8,
+    invite_code: []const u8,
+    created_by: Ref(LocalUser),
+
+    uses: i64,
+    max_uses: ?i64,
+
+    created_at: DateTime,
+    expires_at: ?DateTime,
+};

src/main/main.zig

@@ -25,6 +25,9 @@ const router = Router{
         Route.new(.POST, "/notes/:id/reacts", c.notes.reacts.create),
 
         Route.new(.GET, "/actors/:id", c.actors.get),
+
+        Route.new(.POST, "/admin/invites", c.admin.invites.create),
+        Route.new(.GET, "/admin/invites/:id", c.admin.invites.get),
     },
 };
 

src/sql/lib.zig

@@ -113,7 +113,9 @@ pub const PreparedStmt = struct {
     }
 
     pub fn bindText(self: PreparedStmt, idx: u15, str: []const u8) !void {
-        return switch (c.sqlite3_bind_text(self.stmt, idx, str.ptr, @intCast(c_int, str.len), c.SQLITE_TRANSIENT)) {
+        // Work around potential null pointer in empty string
+        const eff_str = if (str.len == 0) (" ")[0..0] else str;
+        return switch (c.sqlite3_bind_text(self.stmt, idx, eff_str.ptr, @intCast(c_int, eff_str.len), c.SQLITE_TRANSIENT)) {
             c.SQLITE_OK => {},
             else => error.UnknownError,
         };