summaryrefslogtreecommitdiff
path: root/src/transmission.zig
blob: e25d30b9a7d15a9f50628c6c8847964317abb3bb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
const std = @import("std");
const util = @import("util.zig");

const Request = @import("request.zig").Request;
const SessionGetFields = @import("request.zig").SessionGetFields;
const SessionGet = @import("request.zig").SessionGet;
const TorrentGet = @import("request.zig").TorrentGet;
const TorrentGetFields = @import("request.zig").TorrentGetFields;

pub const ClientOptions = extern struct {
    host: [*:0]const u8,
    port: u16,
    https: bool,
    user: ?[*:0]const u8 = null,
    password: ?[*:0]const u8 = null,
};

pub const Client = struct {
    uri: std.Uri,
    allocator: std.mem.Allocator,
    http_client: std.http.Client,
    http_headers: std.http.Headers,
    current_session_id: []u8 = "",

    pub fn init(allocator: std.mem.Allocator, opts: ClientOptions) Client {
        const base_url = std.Uri{
            .path = "/transmission/rpc",
            .scheme = blk: {
                if (opts.https) {
                    break :blk "https";
                } else {
                    break :blk "http";
                }
            },
            .host = std.mem.span(opts.host),
            .port = opts.port,
            .user = null,
            .password = null,
            .query = null,
            .fragment = null,
        };

        return Client{
            .uri = base_url,
            .allocator = allocator,
            .http_client = std.http.Client{ .allocator = allocator },
            .http_headers = std.http.Headers{ .allocator = allocator },
        };
    }

    pub fn deinit(self: *Client) void {
        self.http_headers.deinit();
        self.http_client.deinit();
        self.allocator.free(self.current_session_id);
    }

    fn setSessionId(self: *Client, r: std.http.Client.Response) !void {
        self.allocator.free(self.current_session_id);
        const session_id = r.headers.getFirstValue("X-Transmission-Session-Id") orelse return error.NoSessionId;
        self.current_session_id = try std.fmt.allocPrint(self.allocator, "{s}", .{session_id});
    }

    fn newRequest(self: *Client) !std.http.Client.Request {
        try self.http_headers.append("X-Transmission-Session-Id", self.current_session_id);
        return try self.http_client.request(.POST, self.uri, self.http_headers, .{});
    }

    pub fn do(self: *Client, req: Request) ![]u8 {
        var real_req = try self.newRequest();
        defer real_req.deinit();

        var payload = std.ArrayList(u8).init(self.allocator);
        defer payload.deinit();

        try std.json.stringify(req, .{}, payload.writer());

        real_req.transfer_encoding = std.http.Client.RequestTransfer{
            .content_length = payload.items.len,
        };

        try real_req.start();
        if (try real_req.write(payload.items) != payload.items.len) {
            return error.InvalidSize;
        }

        try real_req.finish();
        try real_req.wait();

        if (real_req.response.status == std.http.Status.conflict) {
            try self.setSessionId(real_req.response);
            return self.do(req);
        }

        var body = std.ArrayList(u8).init(self.allocator);

        // TODO making max_append_size this large
        // all the time doesn't feel right
        try real_req.reader().readAllArrayList(&body, 9000000000);

        return body.toOwnedSlice();
    }
};

pub fn session_get_raw(client: *Client, session_get: ?SessionGet) ![]u8 {
    const default: SessionGet = .{
        .fields = comptime util.enumFieldsToSlice(SessionGetFields),
    };

    const r = Request{
        .method = .session_get,
        .arguments = .{ .session_get = session_get orelse default },
    };
    const body = try client.do(r);
    return body;
}

pub fn torrent_get_raw(client: *Client, torrent_get: ?TorrentGet) ![]u8 {
    const default: TorrentGet = .{
        .fields = comptime util.enumFieldsToSlice(TorrentGetFields),
    };

    const r = Request{
        .method = .torrent_get,
        .arguments = .{ .torrent_get = torrent_get orelse default },
    };
    const body = try client.do(r);
    return body;
}