67 lines
2.4 KiB
JavaScript
67 lines
2.4 KiB
JavaScript
 
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// @ts-check
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/**
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* Files outside the notebooks: image files to put on a page, and the place
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* a picture of a page is exported to. A web page cannot look through the
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* user's directories or write where the user chooses, so it asks the local
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* program (kokkoja.py), as it does for the notebooks.
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*/
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import { askLocalProgram } from './notebook.js';
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/**
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* @typedef {object} DirectoryListing
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* @property {string} directory Its full path.
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* @property {string | null} parent Null at the top of the file system.
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* @property {{name: string, path: string}[]} directories
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* @property {{name: string, path: string, size: number}[]} files Image files only.
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*/
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/**
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* @param {Response} response
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* @returns {Promise<string>} What the local program says went wrong.
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*/
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async function reason(response) {
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try {
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return String((await response.json()).error);
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} catch {
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return `error ${response.status}`;
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}
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}
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/**
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* @param {string} [directory] A full path; without one, where the notebooks are.
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* @returns {Promise<DirectoryListing>}
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*/
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export async function listFiles(directory = '') {
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const response = await askLocalProgram(`api/files?directory=${encodeURIComponent(directory)}`);
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if (!response.ok) throw new Error(`${directory}: ${await reason(response)}`);
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return response.json();
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}
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/**
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* @param {string} path The full path of an image file, from a listing.
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* @returns {Promise<Blob>}
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*/
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export async function readFile(path) {
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const response = await askLocalProgram(`api/file?path=${encodeURIComponent(path)}`);
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if (!response.ok) throw new Error(`${path}: ${await reason(response)}`);
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return response.blob();
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}
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/**
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* Write a PNG picture into a directory.
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* @param {string} directory Its full path.
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* @param {string} name Ending in .png.
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* @param {Blob} picture
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* @param {boolean} replace Whether a file of that name may be replaced.
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* @returns {Promise<string | null>} The full path written, or null if a
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* file of that name exists and may not be replaced.
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*/
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export async function writePicture(directory, name, picture, replace) {
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const query = `directory=${encodeURIComponent(directory)}&name=${encodeURIComponent(name)}` +
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(replace ? '&replace=1' : '');
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const response = await askLocalProgram(`api/file?${query}`, 'PUT', picture);
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if (response.status === 409) return null;
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if (!response.ok) throw new Error(await reason(response));
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return (await response.json()).saved;
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}
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