Zig

BatchModify - Add a Label to each Message in Search Results

See more GMail REST API Examples

Searchs GMail for messages meeting a criteria and adds a label to each message found. Zig

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

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

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

    const http = try chilkat.Http.init();
    defer http.deinit();
    http.setAuthToken("GMAIL-ACCESS-TOKEN");

    const user_id = "me";
    http.setUrlVar("userId", user_id) catch {};

    const query = "subject:questions";
    http.setUrlVar("query", query) catch {};

    var url: [:0]const u8 = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages?q={$query}";

    const sb = try chilkat.StringBuilder.init();
    defer sb.deinit();
    http.quickGetSb(url, sb) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadSb(sb) catch {};
    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    if (http.getLastStatus() != 200) {
        std.debug.print("Failed.\n", .{});
        return;
    }

    // If successful, the received JSON looks like this:
    // {
    //   "messages": [
    //     {
    //       "id": "166f583051d36144",
    //       "threadId": "166f583051d36144"
    //     },
    //     {
    //       "id": "166f5815e1f36144",
    //       "threadId": "166f5815e1f36144"
    //     },
    //     ...
    //     {
    //       "id": "166f580639e36144",
    //       "threadId": "166f580639e36144"
    //     },
    //     {
    //       "id": "15dbc2e28ec789c6",
    //       "threadId": "15dbc2e28ec789c6"
    //     }
    //   ],
    //   "nextPageToken": "13434766102274844688",
    //   "resultSizeEstimate": 103
    // }
    //

    // Next, we'll be sending an HTTP POST to add the label "questions" to each message in the
    // search results.  The JSON to be sent for the batchModify is this:

    //     {
    //       "ids": [
    //         string
    //       ],
    //       "addLabelIds": [
    //         string
    //       ],
    //       "removeLabelIds": [
    //         string
    //       ]
    //     }

    // We'll omit "removeLabelIds" because we're not removing any labels.
    // We are parsing the JSON search results, and at the same time building the batchModify JSON.

    const json2 = try chilkat.JsonObject.init();
    defer json2.deinit();

    var i: i32 = 0;
    const num_messages = json.sizeOfArray("messages");
    while (i < num_messages) {
        json.setI(i);
        const id = try json.stringOf(alloc, "messages[i].id");
        json2.setI(i);
        json2.updateString("ids[i]", id) catch {};
        i = i + 1;
    }

    // We need the id of the label (not the name).
    // I know the name of the label is "questions", but I need to know the id.
    // See this example: Get Label Id by Name
    // The id of my label named "questions" is "Label_43"
    const label_id = "Label_43";
    json2.updateString("addLabelIds[0]", label_id) catch {};
    json2.updateNewArray("removeLabelIds") catch {};

    json2.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json2.emit(alloc)});

    // Send the batchModify
    url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/batchModify";
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpJson("POST", url, json2, "application/json", resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("status = {d}\n", .{resp.getStatusCode()});

    // A 204 response status indicate success.
    if (resp.getStatusCode() != 204) {
        std.debug.print("{s}\n", .{try resp.getBodyStr(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // The 204 response has an empty response body..

    std.debug.print("BatchModify success!\n", .{});
}