yunohost-admin/app/src/helpers/api.js

function objectToParams(object) {
    const urlParams = new URLSearchParams();
    for (const [key, value] of Object.entries(object)) {
        urlParams.append(key, value)
    }
    return urlParams
}


function handleResponse(response, type = 'json') {
    return response.ok ? response[type]() : handleErrors(response)
}


function handleErrors(response) {
    if (response.status == 401) {
        throw new Error('Unauthorized');
    }
}


export default {
    options: {
        credentials: 'include',
        mode: 'cors',
        headers: {
            // FIXME is it important to keep this previous `Accept` header ?
            // 'Accept': 'application/json, text/javascript, */*; q=0.01',
            // Auto header is :
            // "Accept": "*/*",

            // Also is this still important ? (needed by back-end)
            'X-Requested-With': 'XMLHttpRequest',
        }
    },

    get(uri) {
        return fetch('/api/' + uri, this.options)
        .then(response => handleResponse(response))
        .catch(err => {
            console.log(err)
        })
    },

    login(password) {
        return fetch('/api/login', {
            method: 'POST',
            body: objectToParams({password}),
            ...this.options
        }).then(response => (response.ok))
    },

    logout() {
        return fetch('/api/logout', this.options).then(response => (response.ok))
    },

    getVersion() {
        return fetch('/api/versions', this.options)
        .then(response => handleResponse(response))
    }
}