Zig

Box.com Streaming Upload File

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Demonstrates how to upload a file to box.com, streaming the file directly from the filesystem.

Note: This example requires a fix that is included in Chilkat v9.5.0.70 and above.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const rest = try chilkat.Rest.init();
    defer rest.deinit();

    //   Provide a previously obtained OAuth2 access token.
    const oauth2 = try chilkat.OAuth2.init();
    defer oauth2.deinit();
    oauth2.setAccessToken("BOX_ACCESS_TOKEN");
    rest.setAuthOAuth2(oauth2) catch {};

    // First, make the initial connection.
    // A single REST object, once connected, can be used for many Box REST API calls.
    // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    // then it will be automatically re-established as needed.
    const b_auto_reconnect = true;

    // ----------------------------------------------------------------------
    // IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
    // ----------------------------------------------------------------------
    rest.connect("upload.box.com", 443, true, b_auto_reconnect) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    // The request body uses the "multipart/form-data" format to transmit two "parts".
    // The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file
    // and the ID of the parent folder. The second part contains the contents of the file.
    // (Note that the name of the second "part" is ignored.)

    rest.addHeader("Content-Type", "multipart/form-data") catch {};

    // Provide the content for each part of the request...

    // First the JSON attributes.  Use "0" for the root folder.
    //   {"name":"hedgehogs.jpg", "parent":{"id":"0"}}
    const json_attr = try chilkat.JsonObject.init();
    defer json_attr.deinit();
    json_attr.updateString("name", "hedgehogs.jpg") catch {};
    json_attr.updateString("parent.id", "0") catch {};

    rest.setPartSelector("1");
    rest.addHeader("Content-Disposition", "form-data; name=\"attributes\"; ") catch {};
    rest.setMultipartBodyString(try json_attr.emit(alloc)) catch {};

    // The upload will stream directly from a file.
    rest.setPartSelector("2");
    rest.addHeader("Content-Disposition", "form-data; name=\"file\"; filename=\"hedgehogs.jpg\"") catch {};
    // "application/octet-stream" can be safely used for any type file..
    rest.addHeader("Content-Type", "application/octet-stream") catch {};

    // IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
    // multipart/streaming uploads.
    const file_stream = try chilkat.Stream.init();
    defer file_stream.deinit();
    file_stream.setSourceFile("qa_data/jpg/hedgehogs.jpg");
    rest.setMultipartBodyStream(file_stream) catch {};

    // Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
    rest.setPartSelector("0");

    // Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
    const response_body = rest.fullRequestMultipart(alloc, "POST", "/api/2.0/files/content") catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    // A 201 is received for a successful upload
    if (rest.getResponseStatusCode() != 201) {
        std.debug.print("Box.com upload failed.\n", .{});
        std.debug.print("Request header:\n", .{});
        std.debug.print("{s}\n", .{try rest.getLastRequestHeader(alloc)});
        std.debug.print("---\n", .{});
        std.debug.print("Response status code = {d}\n", .{rest.getResponseStatusCode()});
        std.debug.print("Response body:\n", .{});
        std.debug.print("{s}\n", .{response_body});
        return;
    }

    std.debug.print("File uploaded.\n", .{});
}