fediglam/src/api/services/invites.zig

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const std = @import("std");
const builtin = @import("builtin");
const util = @import("util");
const Uuid = util.Uuid;
const DateTime = util.DateTime;
// 9 random bytes = 12 random b64
const rand_len = 8;
const code_len = 12;
const Encoder = std.base64.url_safe.Encoder;
const Decoder = std.base64.url_safe.Decoder;
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pub const Kind = enum {
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system,
community_owner,
user,
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pub const jsonStringify = util.jsonSerializeEnumAsString;
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};
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const InviteCount = u16;
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pub const Invite = struct {
id: Uuid,
created_by: Uuid, // User ID
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community_id: ?Uuid,
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name: []const u8,
code: []const u8,
created_at: DateTime,
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times_used: InviteCount,
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expires_at: ?DateTime,
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max_uses: ?InviteCount,
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kind: Kind,
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};
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pub const InviteOptions = struct {
name: ?[]const u8 = null,
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max_uses: ?InviteCount = null,
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lifespan: ?DateTime.Duration = null,
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kind: Kind = .user,
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};
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pub fn create(db: anytype, created_by: Uuid, community_id: ?Uuid, options: InviteOptions, alloc: std.mem.Allocator) !Uuid {
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const id = Uuid.randV4(util.getThreadPrng());
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var code_bytes: [rand_len]u8 = undefined;
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util.getThreadPrng().bytes(&code_bytes);
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const code = try alloc.alloc(u8, code_len);
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defer alloc.free(code);
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_ = Encoder.encode(code, &code_bytes);
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const name = options.name orelse code;
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const created_at = DateTime.now();
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try db.insert(
"invite",
.{
.id = id,
.created_by = created_by,
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.community_id = community_id,
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.name = name,
.code = code,
.max_uses = options.max_uses,
.created_at = created_at,
.expires_at = if (options.lifespan) |lifespan|
created_at.add(lifespan)
else
null,
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.kind = options.kind,
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},
alloc,
);
return id;
}
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pub const GetError = error{
NotFound,
DatabaseFailure,
};
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// Helper fn for getting a single invite
fn doGetQuery(
db: anytype,
comptime where: []const u8,
query_args: anytype,
alloc: std.mem.Allocator,
) GetError!Invite {
// Generate list of fields from struct
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const field_list = comptime util.comptimeJoinWithPrefix(
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",",
"invite.",
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&.{
"id",
"created_by",
"community_id",
"name",
"code",
"created_at",
"expires_at",
"max_uses",
"kind",
},
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);
// times_used field is not stored directly in the DB, instead
// it is calculated based on the number of accounts that were created
// from it
const query = std.fmt.comptimePrint(
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\\SELECT {s}, COUNT(local_account.account_id) AS times_used
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\\FROM invite LEFT OUTER JOIN local_account
\\ ON invite.id = local_account.invite_id
\\WHERE {s}
\\GROUP BY invite.id
\\LIMIT 1
,
.{ field_list, where },
);
return db.queryRow(Invite, query, query_args, alloc) catch |err| switch (err) {
error.NoRows => error.NotFound,
else => error.DatabaseFailure,
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};
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}
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pub fn get(db: anytype, id: Uuid, alloc: std.mem.Allocator) GetError!Invite {
return doGetQuery(db, "invite.id = $1", .{id}, alloc);
}
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pub fn getByCode(db: anytype, code: []const u8, community_id: Uuid, alloc: std.mem.Allocator) GetError!Invite {
return doGetQuery(
db,
"invite.code = $1 AND invite.community_id = $2",
.{ code, community_id },
alloc,
);
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}