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callTgApi.ts
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callTgApi.ts
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import { TG_API_URL } from "./TG_API_URL.ts";
import type { TgApiOptions } from "./TgApiOptions.ts";
import type { TgBotConfig } from "./TgBotConfig.ts";
import { TgError } from "./TgError.ts";
import type { TgApi } from "./TgApi.ts";
/**
* Calls a Telegram Bot API method.
*
* This is just a simple wrapper over {@link fetch}.
*
* @throws {TgError} if the response is not OK.
*
* @example Setting bot's name.
*
* ```ts
* import { callTgApi } from "./mod.ts";
*
* const botToken = "YOUR_TOKEN";
*
* await callTgApi({ botToken }, "setMyName", { name: "My Bot" });
*
* const botUser = await callTgApi({ botToken }, "getMe", undefined);
* console.log(botUser.first_name); // "My Bot"
* ```
*/
export async function callTgApi<M extends keyof TgApi>(
config: TgBotConfig,
method: M,
...[params, options]: Parameters<TgApi<TgApiOptions>[M]>
): Promise<Awaited<ReturnType<TgApi[M]>>> {
const baseUrl = new URL(
`./bot${config.botToken}/${method}`,
config.apiUrl ?? TG_API_URL,
);
const { url, ...init } = prepareTgRequest(config, baseUrl, params, options);
const localFetch = config.fetch ?? globalThis.fetch;
const response = await localFetch(url.href, { method: "POST", ...init });
const data = await response.json().catch(() => null);
if (data?.ok === true) return data.result;
if (data?.ok === false) throw new TgError(data.description, data.error_code, data.parameters);
if (!response.ok) throw new TgError(response.statusText, response.status);
throw new TgError("Invalid response", response.status);
}
function prepareTgRequest(
config: TgBotConfig,
url: URL,
params: Record<string, unknown> | null | undefined,
options?: TgApiOptions,
) {
const signal = options?.signal ?? null;
// Params are empty?
if (params == null || Object.keys(params).length === 0) {
// Send an empty request.
return { url, signal };
}
// Params are simple values?
if (
Object.values(params).every(
(v) =>
typeof v == "string" ||
typeof v == "number" ||
typeof v == "boolean" ||
v == null,
)
) {
// Send params in query string.
const searchParams = new URLSearchParams();
for (const [key, value] of Object.entries(params)) {
if (value != null && value !== false) {
searchParams.set(key, String(value));
}
}
return { url: new URL(`?${searchParams}`, url.href), signal };
}
// Params contain a Blob?
if (
Object.values(params).some(
(v) =>
v != null &&
typeof v == "object" &&
typeof (v as Blob).arrayBuffer == "function",
)
) {
// Send params as FormData.
return { url, body: jsonToFormData(config, params), signal };
}
const { blobs, json } = extractBlobsFromJson(params);
// There wasn't any deeply nested blobs?
if (blobs.size === 0) {
// Send params as JSON.
return {
url,
headers: { "Content-Type": "application/json" as const },
body: JSON.stringify(json),
signal,
};
}
// Send params as FormData, with blobs moved to the top level.
// See for example: https://core.telegram.org/bots/api#inputmediaphoto
for (const [key, blob] of blobs) {
json[key] = blob;
}
return { url, body: jsonToFormData(config, json), signal };
}
function jsonToFormData(config: TgBotConfig, json: Record<string, unknown>) {
const LocalFormData = config.FormData ?? globalThis.FormData;
const formData = new LocalFormData();
for (const [key, value] of Object.entries(json)) {
if (typeof value == "string" || typeof value == "number") {
// Send strings and numbers as strings.
formData.set(key, String(value));
} else if (
value != null &&
typeof value == "object" &&
typeof (value as Blob).arrayBuffer == "function"
) {
// Send Blobs as Blobs.
formData.set(key, value as Blob);
} else if (value != null && value !== false) {
// Send everything else as a JSON string.
formData.set(key, JSON.stringify(value));
}
}
return formData;
}
function extractBlobsFromJson(value: unknown) {
const blobs = new Map<string, Blob>();
let blobIndex = 0;
const json = JSON.parse(JSON.stringify(value, (_key, value) => {
if (
value != null &&
typeof value == "object" &&
typeof (value as Blob).arrayBuffer == "function"
) {
const blobKey = `blob${blobIndex++}`;
blobs.set(blobKey, value as Blob);
return `attach://${blobKey}`;
}
return value;
}));
return { blobs, json };
}