books/backends/rest_client.js

const frappe = require('frappe-core');
const path = require('path');

module.exports = class RESTClient {
    constructor({server, protocol='http'}) {
        this.server = server;
        this.protocol = protocol;

        this.init_type_map();

        this.json_headers = {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        }
    }

    connect() {

    }

    async insert(doctype, doc) {
        doc.doctype = doctype;
        let url = this.protocol + '://' + path.join(this.server, `/api/resource/${frappe.slug(doctype)}`);
        let response = await frappe.fetch(url, {
            method: 'POST',
            headers: this.json_headers,
            body: JSON.stringify(doc)
        });

        return await response.json();
    }

    async get(doctype, name) {
        let url = this.protocol + '://' + path.join(this.server, `/api/resource/${frappe.slug(doctype)}/${name}`);
        let response = await frappe.fetch(url, {
            method: 'GET',
            headers: this.json_headers
        });
        return await response.json();
    }

    async get_all({doctype, fields, filters, start, limit, sort_by, order}) {
        let url = this.protocol + '://' + path.join(this.server, `/api/resource/${frappe.slug(doctype)}`);

        url = url + "?" + this.get_query_string({
            fields: JSON.stringify(fields),
            filters: JSON.stringify(filters),
            start: start,
            limit: limit,
            sort_by: sort_by,
            order: order
        });

        let response = await frappe.fetch(url, {
            method: 'GET',
            headers: this.json_headers
        });
        return await response.json();

    }

    async update(doctype, doc) {
        doc.doctype = doctype;
        let url = this.protocol + '://' + path.join(this.server, `/api/resource/${frappe.slug(doctype)}/${doc.name}`);
        let response = await frappe.fetch(url, {
            method: 'PUT',
            headers: this.json_headers,
            body: JSON.stringify(doc)
        });

        return await response.json();
    }

    async delete(doctype, name) {
        let url = this.protocol + '://' + path.join(this.server, `/api/resource/${frappe.slug(doctype)}/${name}`);

        let response = await frappe.fetch(url, {
            method: 'DELETE',
            headers: this.json_headers
        });

        return await response.json();
    }

    get_query_string(params) {
        return Object.keys(params)
            .map(k => params[k] != null ? encodeURIComponent(k) + '=' + encodeURIComponent(params[k]) : null)
            .filter(v => v)
            .join('&');
    }

    init_type_map() {
        this.type_map = {
            'Currency':        true
            ,'Int':            true
            ,'Float':        true
            ,'Percent':        true
            ,'Check':        true
            ,'Small Text':    true
            ,'Long Text':    true
            ,'Code':        true
            ,'Text Editor':    true
            ,'Date':        true
            ,'Datetime':    true
            ,'Time':        true
            ,'Text':        true
            ,'Data':        true
            ,'Link':        true
            ,'Dynamic Link':true
            ,'Password':    true
            ,'Select':        true
            ,'Read Only':    true
            ,'Attach':        true
            ,'Attach Image':true
            ,'Signature':    true
            ,'Color':        true
            ,'Barcode':        true
            ,'Geolocation':    true
        }
    }

    close() {

    }

}