fediglam/src/main/api.zig

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const std = @import("std");
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const util = @import("util");
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const builtin = @import("builtin");
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const db = @import("./db.zig");
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const models = @import("./db/models.zig");
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pub const DateTime = util.DateTime;
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pub const Uuid = util.Uuid;
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const Config = @import("./main.zig").Config;
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const PwHash = std.crypto.pwhash.scrypt;
const pw_hash_params = PwHash.Params.interactive;
const pw_hash_encoding = .phc;
const pw_hash_buf_size = 128;
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const token_len = 20;
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const token_str_len = std.base64.standard.Encoder.calcSize(token_len);
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const invite_code_len = 16;
const invite_code_str_len = std.base64.url_safe.Encoder.calcSize(invite_code_len);
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// Frees an api struct and its fields allocated from alloc
pub fn free(alloc: std.mem.Allocator, val: anytype) void {
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switch (@typeInfo(@TypeOf(val))) {
.Pointer => |ptr_info| switch (ptr_info.size) {
.One => {
free(alloc, val.*);
alloc.destroy(val);
},
.Slice => {
for (val) |elem| free(alloc, elem);
alloc.free(val);
},
else => unreachable,
},
.Struct => inline for (std.meta.fields(@TypeOf(val))) |f| free(alloc, @field(val, f.name)),
.Array => for (val) |elem| free(alloc, elem),
.Optional => if (val) |opt| free(alloc, opt),
.Bool, .Int, .Float, .Enum => {},
else => unreachable,
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}
}
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pub fn firstIndexOf(str: []const u8, ch: u8) ?usize {
for (str) |c, i| {
if (c == ch) return i;
}
return null;
}
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pub fn CreateInfo(comptime T: type) type {
const t_fields = std.meta.fields(T);
var fields: [t_fields.len - 1]std.builtin.Type.StructField = undefined;
var count = 0;
inline for (t_fields) |f| {
if (std.mem.eql(u8, f.name, "id")) continue;
fields[count] = f;
count += 1;
}
return @Type(.{ .Struct = .{
.layout = .Auto,
.fields = &fields,
.decls = &[0]std.builtin.Type.Declaration{},
.is_tuple = false,
} });
}
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fn reify(comptime T: type, id: Uuid, val: CreateInfo(T)) T {
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var result: T = undefined;
result.id = id;
inline for (std.meta.fields(CreateInfo(T))) |f| {
@field(result, f.name) = @field(val, f.name);
}
return result;
}
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pub const NoteCreateInfo = struct {
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content: []const u8,
};
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pub const Scheme = models.Community.Scheme;
pub const CommunityCreateOptions = struct {
name: []const u8,
host: []const u8,
};
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pub const RegistrationInfo = struct {
username: []const u8,
password: []const u8,
email: ?[]const u8,
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invite_code: ?[]const u8,
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community_host: ?[]const u8,
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};
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pub const LoginResult = struct {
user_id: Uuid,
token: [token_str_len]u8,
issued_at: DateTime,
};
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pub const InviteOptions = struct {
name: []const u8 = "",
max_uses: ?i64 = null,
lifetime: ?i64 = null, // unix seconds, TODO make a TimeSpan type
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to_community: ?[]const u8,
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};
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threadlocal var prng: std.rand.DefaultPrng = undefined;
pub fn initThreadPrng(seed: u64) void {
prng = std.rand.DefaultPrng.init(seed +% std.Thread.getCurrentId());
}
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pub const ApiSource = struct {
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db: db.Database,
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internal_alloc: std.mem.Allocator,
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config: Config,
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pub const Conn = ApiConn(db.Database);
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pub fn init(alloc: std.mem.Allocator, cfg: Config) !ApiSource {
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var my_db = try db.Database.init();
{
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const row = try my_db.execRow2(
&.{Uuid},
"SELECT id FROM user WHERE username = ?",
.{"heartles"},
null,
);
std.log.debug("{s}", .{row.?[0]});
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}
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return ApiSource{
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//.db = try db.Database.init(),
.db = my_db,
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.internal_alloc = alloc,
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.config = cfg,
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};
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}
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pub fn connectUnauthorized(self: *ApiSource, host: ?[]const u8, alloc: std.mem.Allocator) !Conn {
const community_id = blk: {
if (host) |h| {
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const result = try self.db.execRow2(&.{Uuid}, "SELECT id FROM community WHERE host = ?", .{h}, null);
if (result) |r| break :blk r[0];
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}
break :blk null;
};
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return Conn{
.db = self.db,
.internal_alloc = self.internal_alloc,
.as_user = null,
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.on_community = community_id,
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.arena = std.heap.ArenaAllocator.init(alloc),
};
}
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pub fn connectToken(self: *ApiSource, host: ?[]const u8, token: []const u8, alloc: std.mem.Allocator) !Conn {
var conn = try self.connectUnauthorized(host, alloc);
errdefer conn.close();
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const decoded_len = std.base64.standard.Decoder.calcSizeForSlice(token) catch return error.InvalidToken;
if (decoded_len != token_len) return error.InvalidToken;
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var decoded: [token_len]u8 = undefined;
std.base64.standard.Decoder.decode(&decoded, token) catch return error.InvalidToken;
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var hash: models.ByteArray(models.Token.hash_len) = undefined;
models.Token.HashFn.hash(&decoded, &hash.data, .{});
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const db_token = (try self.db.getBy(models.Token, .hash, hash, conn.arena.allocator())) orelse return error.InvalidToken;
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//const token_result = (try self.db.execRow2(
//&.{Uuid},
//"SELECT id FROM token WHERE hash = ?",
//.{hash},
//null,
//)) orelse return error.InvalidToken;
//conn.as_user = token_result[0];
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conn.as_user = db_token.user_id;
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return conn;
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}
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};
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fn ApiConn(comptime DbConn: type) type {
return struct {
const Self = @This();
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db: DbConn,
internal_alloc: std.mem.Allocator, // used *only* for large, internal buffers
as_user: ?Uuid,
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on_community: ?Uuid,
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arena: std.heap.ArenaAllocator,
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pub fn close(self: *Self) void {
self.arena.deinit();
}
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fn getAuthenticatedUser(self: *Self) !models.User {
if (self.as_user) |id| {
const user = try self.db.getBy(models.User, .id, id, self.arena.allocator());
if (user == null) return error.NotAuthorized;
return user.?;
} else {
return error.NotAuthorized;
}
}
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fn getAuthenticatedLocalUser(self: *Self) !models.LocalUser {
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if (self.as_user) |user_id| {
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const local_user = try self.db.getBy(models.LocalUser, .user_id, user_id, self.arena.allocator());
if (local_user == null) return error.NotAuthorized;
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return local_user.?;
} else {
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return error.NotAuthorized;
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}
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}
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fn getAuthenticatedActor(self: *Self) !models.Actor {
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return if (self.as_user) |user_id|
(try self.db.getBy(models.Actor, .user_id, user_id, self.arena.allocator())) orelse error.NotAuthorized
else
error.NotAuthorized;
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}
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pub fn createNote(self: *Self, info: NoteCreateInfo) !models.Note {
const id = Uuid.randV4(prng.random());
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const actor = try self.getAuthenticatedActor();
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const note = models.Note{
.id = id,
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.author_id = actor.user_id,
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.content = info.content,
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.created_at = DateTime.now(),
};
try self.db.insert(models.Note, note);
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return note;
}
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//pub fn getNote(self: *Self, id: Uuid) !?models.Note {
pub fn getNote(self: *Self, id: Uuid) !?[]const u8 {
const row = try self.db.execRow("select content from note where id = ?", .{id}, &.{[]const u8}, self.arena.allocator());
if (row) |results| {
return results[0];
} else return null;
//return self.db.getBy(models.Note, .id, id, self.arena.allocator());
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}
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pub fn getActor(self: *Self, user_id: Uuid) !?models.Actor {
return self.db.getBy(models.Actor, .user_id, user_id, self.arena.allocator());
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}
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pub fn getActorByHandle(self: *Self, handle: []const u8) !?models.Actor {
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const user = (try self.db.getBy(models.User, .username, handle, self.arena.allocator())) orelse return null;
return self.db.getBy(models.Actor, .user_id, user.id, self.arena.allocator());
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}
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pub fn react(self: *Self, note_id: Uuid) !void {
const id = Uuid.randV4(prng.random());
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const actor = try self.getAuthenticatedActor();
try self.db.insert(models.Reaction, .{ .id = id, .note_id = note_id, .reactor_id = actor.user_id, .created_at = DateTime.now() });
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}
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pub fn listReacts(self: *Self, note_id: Uuid) ![]models.Reaction {
return try self.db.getWhereEq(models.Reaction, .note_id, note_id, self.arena.allocator());
}
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pub fn createCommunity(self: *Self, info: CommunityCreateOptions) !models.Community {
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const scheme_len = firstIndexOf(info.host, ':') orelse return error.InvalidHost;
const scheme_str = info.host[0..scheme_len];
const scheme = std.meta.stringToEnum(models.Community.Scheme, scheme_str) orelse return error.UnsupportedScheme;
const host = blk: {
// host must be in the format "{scheme}://{host}"
if (info.host.len <= scheme_len + ("://").len or
info.host[scheme_len] != ':' or
info.host[scheme_len + 1] != '/' or
info.host[scheme_len + 2] != '/') return error.InvalidHost;
const host = info.host[scheme_len + 3 ..];
// community cannot use non-default ports (except for testing)
// NOTE: Do not add, say localhost and localhost:80 or bugs may happen.
// Avoid using non-default ports unless a test can't be conducted without it.
if (firstIndexOf(host, ':') != null and builtin.mode != .Debug) return error.InvalidHost;
// community cannot be hosted on a path
if (firstIndexOf(host, '/') != null) return error.InvalidHost;
break :blk host;
};
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const id = Uuid.randV4(prng.random());
const now = DateTime.now();
// Require TLS on production builds
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if (scheme != .https and builtin.mode != .Debug) return error.UnsupportedScheme;
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const community = models.Community{
.id = id,
.created_at = now,
.name = info.name,
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.host = host,
.scheme = scheme,
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};
try self.db.insert(models.Community, community);
return community;
}
pub fn getCommunity(self: *Self, host: []const u8) !?models.Community {
return try self.db.getBy(models.Community, .host, host, self.arena.allocator());
}
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pub fn register(self: *Self, info: RegistrationInfo) !models.Actor {
const user_id = Uuid.randV4(prng.random());
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// TODO: lock for transaction
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// TODO: not community aware :(
if (try self.db.execRow2(&.{}, "SELECT 1 FROM user WHERE username = ?", .{info.username}, null) != null) {
//if (try self.db.existsWhereEq(models.User, .username, info.username)) {
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return error.UsernameUnavailable;
}
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const now = DateTime.now();
const invite_id = if (info.invite_code) |invite_code| blk: {
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// TODO have this query also check for time-based expiration
const result = (try self.db.execRow2(
&.{ Uuid, ?DateTime },
\\SELECT invite.id, invite.expires_at
\\FROM invite
\\ LEFT OUTER JOIN local_user ON invite.id = local_user.invite_id
\\WHERE invite.invite_code = ?
\\GROUP BY invite.id
\\HAVING
\\ (invite.max_uses IS NULL OR invite.max_uses > COUNT(local_user.user_id))
\\
,
.{invite_code},
null,
)) orelse return error.InvalidInvite;
const expired = if (result[1]) |expires_at| now.seconds_since_epoch > expires_at.seconds_since_epoch else false;
if (expired) return error.InvalidInvite;
//const invite = (try self.db.getBy(models.Invite, .invite_code, invite_code, self.arena.allocator())) orelse return error.InvalidInvite;
//const invite = (try self.db.getBy(models.Invite, .invite_code, invite_code, self.arena.allocator())) orelse return error.InvalidInvite;
//const uses = try self.db.countWhereEq(models.LocalUser, .invite_id, invite.id);
//const uses_left = if (invite.max_uses) |max_uses| uses < max_uses else true;
//const expired = if (invite.expires_at) |expires_at| now.seconds_since_epoch > expires_at.seconds_since_epoch else false;
//if (!uses_left or expired) return error.InvalidInvite;
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// TODO: increment uses
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break :blk result[0];
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} else null;
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// use internal alloc because necessary buffer is *big*
var buf: [pw_hash_buf_size]u8 = undefined;
const hash = try PwHash.strHash(info.password, .{ .allocator = self.internal_alloc, .params = pw_hash_params, .encoding = pw_hash_encoding }, &buf);
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const community_id = if (info.community_host) |host| blk: {
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//const id_tuple = (try self.db.execRow("select id from community where host = '?'", host, &.{Uuid}, self.arena.allocator())) orelse return error.CommunityNotFound;
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const community_result = (try self.db.execRow2(
&.{Uuid},
"SELECT id FROM community WHERE host = ?",
.{host},
null,
)) orelse return error.CommunityNotFound;
//const community = (try self.db.getBy(models.Community, .host, host, self.arena.allocator())) orelse return error.CommunityNotFound;
break :blk community_result[0];
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//break :blk id_tuple[0];
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} else null;
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const user = models.User{
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.id = user_id,
.username = info.username,
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.created_at = now,
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.community_id = community_id,
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};
const actor = models.Actor{
.user_id = user_id,
.public_id = "abc", // TODO
};
const local_user = models.LocalUser{
.user_id = user_id,
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.email = info.email,
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.invite_id = invite_id,
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.hashed_password = hash,
.password_changed_at = now,
};
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try self.db.insert(models.User, user);
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try self.db.insert(models.Actor, actor);
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try self.db.insert(models.LocalUser, local_user);
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return actor;
}
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pub fn login(self: *Self, username: []const u8, password: []const u8) !LoginResult {
// TODO: This gives away the existence of a user through a timing side channel. is that acceptable?
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//const user_info = (try self.db.getBy(models.User, .username, username, self.arena.allocator())) orelse return error.InvalidLogin;
//const local_user_info = (try self.db.getBy(models.LocalUser, .user_id, user_info.id, self.arena.allocator())) orelse return error.InvalidLogin;
const user_info = (try self.db.execRow2(
&.{ Uuid, []const u8 },
\\SELECT user.id, local_user.hashed_password
\\FROM user JOIN local_user ON local_user.user_id = user.id
\\WHERE user.username = ?
,
.{username},
self.arena.allocator(),
)) orelse return error.InvalidLogin;
const user_id = user_info[0];
const hashed_password = user_info[1];
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//defer free(self.arena.allocator(), user_info);
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const Hash = std.crypto.pwhash.scrypt;
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Hash.strVerify(hashed_password, password, .{ .allocator = self.internal_alloc }) catch |err| switch (err) {
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error.PasswordVerificationFailed => return error.InvalidLogin,
else => return err,
};
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const token = try self.createToken(user_id);
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var token_enc: [token_str_len]u8 = undefined;
_ = std.base64.standard.Encoder.encode(&token_enc, &token.value);
return LoginResult{
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.user_id = user_id,
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.token = token_enc,
.issued_at = token.info.issued_at,
};
}
const TokenResult = struct {
info: models.Token,
value: [token_len]u8,
};
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fn createToken(self: *Self, user_id: Uuid) !TokenResult {
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var token: [token_len]u8 = undefined;
std.crypto.random.bytes(&token);
var hash: [models.Token.hash_len]u8 = undefined;
models.Token.HashFn.hash(&token, &hash, .{});
const db_token = models.Token{
.id = Uuid.randV4(prng.random()),
.hash = .{ .data = hash },
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.user_id = user_id,
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.issued_at = DateTime.now(),
};
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try self.db.insert2("token", db_token);
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return TokenResult{
.info = db_token,
.value = token,
};
}
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pub fn createInvite(self: *Self, options: InviteOptions) !models.Invite {
const id = Uuid.randV4(prng.random());
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const user = try self.getAuthenticatedUser();
// Users can only make invites to their own community, unless they
// are system users
const community_id = if (options.to_community) |host| blk: {
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const desired_community = (try self.db.execRow2(
&.{Uuid},
"SELECT id FROM community WHERE host = ?",
.{host},
null,
)) orelse return error.CommunityNotFound;
if (user.community_id != null and !Uuid.eql(desired_community[0], user.community_id.?)) {
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return error.WrongCommunity;
}
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break :blk desired_community[0];
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} else null;
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if (user.community_id != null and community_id == null) {
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return error.WrongCommunity;
}
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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),
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.created_by = user.id,
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.invite_code = code_str,
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.to_community = community_id,
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.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());
}
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};
}