parsley/app/javascript/lib/Api.js

import config from '../config';
import * as Errors from './Errors';

class Api {
  constructor() {
  }

  baseUrl() { return config.baseApiUrl; }

  url(path) {
    return this.baseUrl() + path;
  }

  checkStatus(response) {
    if (response.status >= 200 && response.status < 300) {
      return response;
    } else if (response.status === 404) {
      throw new Errors.ApiNotFoundError(response.statusText, response);
    } else if (response.status === 422) {
      return response.json().then(json => { throw new Errors.ApiValidationError(null, response, json) }, jsonErr => { throw new Errors.ApiValidationError(null, response, null) });
    } else {
      throw new Errors.ApiServerError(response.statusText || "Unknown Server Error", response);
    }
  }

  parseJSON(response) {
    return response.json();
  }

  performRequest(url, method, params = {}) {
    const hasBody = Object.keys(params || {}).length !== 0;

    const headers = new Headers();
    headers.append('Accept', 'application/json');

    const opts = {
      headers,
      method: method,
      credentials: "same-origin"
    };

    if (hasBody) {
      headers.append('Content-Type', 'application/json');
      opts.body = JSON.stringify(params);
    }

    return fetch(url, opts).then(this.checkStatus).then(this.parseJSON);
  }

  objectToUrlParams(obj, queryParams = [], prefixes = []) {
    for (let key in obj) {
      const val = obj[key];
      const paramName = prefixes.join("[") + "[".repeat(Math.min(prefixes.length, 1)) + encodeURIComponent(key) + "]".repeat(prefixes.length);
      if (Array.isArray(val)) {
        for (let x of val) {
          queryParams.push(paramName + "[]=" + (x === null ? '' : encodeURIComponent(x)));
        }
      } else if (typeof(val) === "object") {
        this.objectToUrlParams(val, queryParams, prefixes.concat([key]));
      } else {
        queryParams.push(paramName + "=" + (val === null ? '' : encodeURIComponent(val)));
      }
    }

    return queryParams;
  }

  get(url, params = {}) {

    const queryParams = this.objectToUrlParams(params);

    if (queryParams.length) {
      url = url + "?" + queryParams.join("&");
    }

    return this.performRequest(url, "GET");
  }

  post(url, params = {}) {
    return this.performRequest(url, "POST", params);
  }

  patch(url, params = {}) {
    return this.performRequest(url, "PATCH", params);
  }

  getRecipeList(page, per, sortColumn, sortDirection, name, tags) {
    const params = {
      criteria: {
        page: page || null,
        per: per || null,
        sort_column: sortColumn || null,
        sort_direction: sortDirection || null,
        name: name || null,
        tags: tags || null
      }
    };

    return this.get("/recipes", params);
  }

  getRecipe(id) {
    return this.get("/recipes/" + id);
  }

  patchRecipe(recipe) {
    const params = {
      recipe: {
        name: recipe.name,
        description: recipe.description,
        source: recipe.source,
        yields: recipe.yields,
        total_time: recipe.total_time,
        active_time: recipe.active_time,
        step_text: recipe.step_text,
        tag_names: recipe.tag_names,
        recipe_ingredients_attributes: recipe.ingredients.map(i => {
          if (i._destroy) {
            return {
              id: i.id,
              _destroy: true
            };
          } else {
            return {
              id: i.id,
              name: i.name,
              ingredient_id: null,
              quantity: i.quantity,
              units: i.units,
              preparation: i.preparation,
              sort_order: i.sort_order
            };
          }
        })
      }
    };

    return this.patch("/recipes/" + recipe.id, params);
  }

  postPreviewSteps(step_text) {
    const params = {
      step_text: step_text
    };

    return this.post("/recipes/preview_steps", params);
  }

  getSearchIngredients(query) {
    const params = { query: query };
    return this.get("/ingredients/search", params);
  }

  postLogin(username, password) {
    const params = {
      username: username,
      password: password
    };

    return this.post("/login", params);
  }

  getLogout() {
    return this.get("/logout");
  }

  getCurrentUser() {
    return this.get("/user")
  }
}

const api = new Api();

export default api;