api.gs

function doGet(request) {
    return withAuthentication(request, () => {
        const store = request.parameter["store"];
        const id = request.parameter["id"];
        if (store == null && id != null)
            return makeResponse({
                status: "fail",
                data: {
                    parameters:
                        'URL parameter "store" cannot be missing if "id" is present',
                },
            });
        let data = null;
        if (store == null) data = uDB.getStores();
        else if (id == null) data = new uDB(store).getAll();
        else data = new uDB(store).get(id);
        return makeResponse({
            status: "success",
            data: data,
        });
    });
}

function doPost(request) {
    return withAuthentication(request, () => {
        const store = request.parameter["store"];
        if (store == null)
            return makeResponse({
                status: "fail",
                data: { store: 'Missing URL parameter "store"' },
            });
        const id = request.parameter["id"];
        if (
            id != null &&
            request.postData != null &&
            request.postData.contents.trim().length > 0
        )
            return makeResponse({
                status: "fail",
                data: {
                    id: 'URL parameter "id" may not be given with document in body',
                },
            });
        let data = null;
        if (
            id == null &&
            (request.postData == null ||
                request.postData.contents.trim().length == 0)
        )
            data = new uDB(store).clear();
        else if (id != null) data = new uDB(store).delete(id);
        else {
            let doc = null;
            try {
                doc = JSON.parse(request.postData.contents);
            } catch {
                return makeResponse({
                    status: "fail",
                    data: { postData: "Request body is not valid JSON" },
                });
            }
            data = new uDB(store).put(doc);
        }
        return makeResponse({
            status: "success",
            data: data,
        });
    });
}

function makeResponse(response) {
    return ContentService.createTextOutput(
        JSON.stringify(response)
    ).setMimeType(ContentService.MimeType.JSON);
}

function withAuthentication(request, func) {
    const expectedApiKey =
        PropertiesService.getScriptProperties().getProperty("api_key");
    if (expectedApiKey == null) {
        console.error('No script property "api_key" set up!');
        return makeResponse({
            status: "error",
            message: 'No script property "api_key" set up',
        });
    }
    const apiKey = request.parameter["api_key"];
    if (apiKey == null || apiKey !== expectedApiKey)
        return makeResponse({
            status: "fail",
            data: {
                authentication: 'Invalid or missing URL parameter "api_key"',
            },
        });
    return func();
}