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[rbdr/blog] / lib / blog.js
1 'use strict';
2
3 const { access, cp, mkdir, readdir, readFile, writeFile } = require('fs/promises');
4 const { exec } = require('child_process');
5 const { basename, resolve, join } = require('path');
6 const ParseGemini = require('gemini-to-html/parse');
7 const RenderGemini = require('gemini-to-html/render');
8 const { debuglog, promisify } = require('util');
9 const { ensureDirectoryExists, rmIfExists } = require('./utils');
10 const { kFileNotFoundError } = require('./constants');
11
12 // Generators for the Blog
13
14 const StaticGenerator = require('./generators/static');
15 const HTMLGenerator = require('./generators/html');
16 const RSSGenerator = require('./generators/rss');
17 const TXTGenerator = require('./generators/txt');
18
19 // Archiving Methods
20
21 const GemlogArchiver = require('./archivers/gemlog');
22
23 // Remote Handler
24
25 const Remote = require('./remote');
26
27 const internals = {
28
29 // Promisified functions
30 exec: promisify(exec),
31
32 debuglog: debuglog('blog'),
33
34 // constants
35
36 kGeminiRe: /\.gmi$/i,
37 kMetadataFilename: 'metadata.json',
38
39 // Strings
40
41 strings: {
42 geminiNotFound: 'Gemini file was not found in blog directory. Please update.'
43 }
44 };
45
46 /**
47 * The Blog class is the blog generator, it's in charge of adding and
48 * updating posts, and handling the publishing.
49 *
50 * @class Blog
51 * @param {Blog.tConfiguration} config the initialization options to
52 * extend the instance
53 */
54 module.exports = class Blog {
55
56 constructor(config) {
57
58 Object.assign(this, config);
59 }
60
61 /**
62 * Shifts the blog posts, adds the passed file to slot 0, and
63 * generates files.
64 *
65 * @function add
66 * @memberof Blog
67 * @param {string} postLocation the path to the blog post file
68 * @return {Promise<undefined>} empty promise, returns no value
69 * @instance
70 */
71 async add(postLocation) {
72
73 await ensureDirectoryExists(this.postsDirectory);
74 try {
75 await this.syncDown();
76 }
77 catch {};
78 await this._shift();
79 const firstDirectory = join(this.postsDirectory, '0');
80 await rmIfExists(firstDirectory);
81 await ensureDirectoryExists(firstDirectory);
82 await this._update(postLocation);
83 }
84
85 /**
86 * Update slot 0 with the passed gmi file, and generates files.
87 *
88 * @function update
89 * @memberof Blog
90 * @param {string} postLocation the path to the blog post file
91 * @return {Promise<undefined>} empty promise, returns no value
92 * @instance
93 */
94 async update(postLocation) {
95
96 try {
97 await this.syncDown();
98 }
99 catch {};
100 const metadata = await this._update(postLocation);
101 }
102
103 /**
104 * Publishes the files to a static host.
105 *
106 * @function publish
107 * @memberof Blog
108 * @return {Promise<undefined>} empty promise, returns no value
109 * @instance
110 */
111 async publish(host) {
112
113 internals.debuglog(`Publishing to ${host}`);
114 try {
115 await internals.exec('which aws');
116 }
117 catch (err) {
118 console.error('Please install and configure AWS CLI to publish.');
119 }
120
121 try {
122 internals.debuglog(`Copying ephemeral blog from ${this.staticDirectory}`);
123 await internals.exec(`rsync -r ${this.staticDirectory}/ ${host}`);
124 }
125 catch (err) {
126 console.error('Failed to publish');
127 console.error(err.stderr);
128 }
129
130 internals.debuglog('Finished publishing');
131 }
132
133 /**
134 * Publishes the archive to a host using rsync. Currently assumes
135 * gemlog archive.
136 *
137 * @function publishArchive
138 * @memberof Blog
139 * @return {Promise<undefined>} empty promise, returns no value
140 * @instance
141 */
142 async publishArchive(host) {
143
144 internals.debuglog(`Publishing archive to ${host}`);
145 try {
146 await internals.exec('which rsync');
147 }
148 catch (err) {
149 console.error('Please install rsync to publish the archive.');
150 }
151
152 try {
153 const gemlogPath = resolve(join(__dirname, '../', '.gemlog'));
154 internals.debuglog(`Copying archive from ${gemlogPath}`);
155 await internals.exec(`rsync -r ${gemlogPath}/ ${host}`);
156 }
157 catch (err) {
158 console.error('Failed to publish archive');
159 console.error(err.stderr);
160 }
161
162 internals.debuglog('Finished publishing');
163 }
164
165 /**
166 * Adds a remote
167 *
168 * @function addRemote
169 * @memberof Blog
170 * @return {Promise<undefined>} empty promise, returns no value
171 * @instance
172 */
173 async addRemote(remote) {
174 await Remote.add(this.remoteConfig, remote)
175 }
176
177 /**
178 * Removes a remote
179 *
180 * @function removeRemote
181 * @memberof Blog
182 * @return {Promise<undefined>} empty promise, returns no value
183 * @instance
184 */
185 async removeRemote() {
186 await Remote.remove(this.remoteConfig)
187 }
188
189
190 /**
191 * Pulls the posts and archive from the remote
192 *
193 * @function syncDown
194 * @memberof Blog
195 * @return {Promise<undefined>} empty promise, returns no value
196 * @instance
197 */
198 async syncDown() {
199 internals.debuglog('Pulling remote state');
200 await ensureDirectoryExists(this.postsDirectory);
201 await Remote.syncDown(this.remoteConfig, this.blogDirectory)
202 internals.debuglog('Pulled remote state');
203 }
204
205 /**
206 * Pushes the posts and archive to the remote
207 *
208 * @function syncUp
209 * @memberof Blog
210 * @return {Promise<undefined>} empty promise, returns no value
211 * @instance
212 */
213 async syncUp() {
214 internals.debuglog('Pushing remote state');
215 await ensureDirectoryExists(this.postsDirectory);
216 await Remote.syncUp(this.remoteConfig, this.blogDirectory)
217 internals.debuglog('Pushed remote state');
218 }
219
220 // Adds the passed path to slot 0, and generates files.
221
222 async _update(postLocation) {
223
224 const metadata = await this._getMetadata();
225 await ensureDirectoryExists(this.postsDirectory);
226 await this._copyPost(postLocation);
227 await this._writeMetadata(metadata);
228
229 await this._archive(postLocation);
230
231 await this.generate();
232 try {
233 await this.syncUp();
234 }
235 catch {};
236 }
237
238
239 // Parses Gemini for each page, copies assets and generates index.
240
241 async generate() {
242
243 internals.debuglog('Generating output');
244
245 const posts = await this._readPosts();
246
247 await StaticGenerator(this.postsDirectory, this.staticDirectory, posts);
248 await HTMLGenerator(this.templatesDirectory, this.staticDirectory, posts);
249 await RSSGenerator(this.templatesDirectory, this.staticDirectory, posts);
250 await TXTGenerator(this.templatesDirectory, this.staticDirectory, posts);
251
252 await GemlogArchiver(this.archiveDirectory);
253 }
254
255 // Reads the posts into an array
256
257 async _readPosts() {
258
259 internals.debuglog('Reading posts');
260 const posts = [];
261
262 for (let i = 0; i < this.maxPosts; ++i) {
263 try {
264 posts.push(await this._readPost(i));
265 }
266 catch (error) {
267 if (error.code === kFileNotFoundError) {
268 internals.debuglog(`Skipping ${i}`);
269 continue;
270 }
271
272 throw error;
273 }
274 }
275
276 return posts;
277 }
278
279 // Reads an individual post
280
281 async _readPost(index=0) {
282 const postSourcePath = join(this.postsDirectory, `${index}`);
283
284 internals.debuglog(`Reading ${postSourcePath}`);
285
286 await access(postSourcePath);
287
288 const metadata = await this._getMetadata(index);
289
290 const postContentPath = await this._findBlogContent(postSourcePath);
291 internals.debuglog(`Reading ${postContentPath}`);
292 const postContent = await readFile(postContentPath, { encoding: 'utf8' });
293
294 internals.debuglog('Parsing Gemini');
295 return {
296 ...metadata,
297 location: postSourcePath,
298 index,
299 html: RenderGemini(ParseGemini(postContent)),
300 raw: postContent
301 };
302 }
303
304 // Shift the posts, delete any remainder.
305
306 async _shift() {
307
308
309 for (let i = this.maxPosts - 1; i >= 1; --i) {
310 const targetPath = join(this.postsDirectory, `${i}`);
311 const sourcePath = join(this.postsDirectory, `${i - 1}`);
312
313 try {
314 internals.debuglog(`Archiving ${targetPath}`);
315 await rmIfExists(targetPath);
316 await access(sourcePath); // check the source path
317
318 internals.debuglog(`Shifting blog post ${sourcePath} to ${targetPath}`);
319 await cp(sourcePath, targetPath, { recursive: true });
320 }
321 catch (error) {
322 if (error.code === kFileNotFoundError) {
323 internals.debuglog(`Skipping ${sourcePath}: Does not exist.`);
324 continue;
325 }
326
327 throw error;
328 }
329 }
330 }
331
332 // Moves older posts to the archive
333
334 async _archive() {
335 internals.debuglog('Archiving post');
336 const post = await this._readPost(0);
337 await ensureDirectoryExists(this.archiveDirectory);
338
339 const targetPath = join(this.archiveDirectory, post.id);
340
341 internals.debuglog(`Removing ${targetPath}`);
342 await rmIfExists(targetPath);
343 internals.debuglog(`Adding ${post.location} to ${targetPath}`);
344 await ensureDirectoryExists(targetPath);
345 await cp(post.location, targetPath, { recursive: true });
346 internals.debuglog(`Added ${post.location} to ${targetPath}`);
347 }
348
349 // Attempts to read existing metadata. Otherwise generates new set.
350
351 async _getMetadata(index = 0) {
352
353 const metadataTarget = join(this.postsDirectory, String(index), internals.kMetadataFilename);
354
355 try {
356 internals.debuglog(`Looking for metadata at ${metadataTarget}`);
357 return JSON.parse(await readFile(metadataTarget, { encoding: 'utf8' }));
358 }
359 catch (e) {
360 internals.debuglog(`Metadata not found or unreadable. Generating new set.`);
361 const createdOn = Date.now();
362 const metadata = {
363 id: String(createdOn),
364 createdOn
365 };
366
367 return metadata;
368 }
369 }
370
371 // Writes metadata. Assumes post 0 since it only gets written
372 // on create
373
374 async _writeMetadata(metadata) {
375
376 const metadataTarget = join(this.postsDirectory, '0', internals.kMetadataFilename);
377 internals.debuglog(`Writing ${metadataTarget}`);
378 await writeFile(metadataTarget, JSON.stringify(metadata, null, 2));
379 }
380
381 // Copies a post file to the latest slot.
382
383 async _copyPost(postLocation) {
384
385 internals.debuglog(`Copying ${postLocation}`);
386 const targetPath = join(this.postsDirectory, '0');
387 const postName = basename(postLocation);
388 const targetPost = join(targetPath, postName);
389
390 await rmIfExists(targetPath);
391 await ensureDirectoryExists(targetPath);
392 await cp(postLocation, targetPost, { recursive: true });
393 internals.debuglog(`Added ${postLocation} to ${targetPath}`);
394 }
395
396 // Looks for a `.gmi` file in the blog directory, and returns the path
397
398 async _findBlogContent(directory) {
399
400 const entries = await readdir(directory);
401
402 const geminiEntries = entries
403 .filter((entry) => internals.kGeminiRe.test(entry))
404 .map((entry) => join(directory, entry));
405
406 if (geminiEntries.length > 0) {
407 internals.debuglog(`Found gemini file: ${geminiEntries[0]}`);
408 return geminiEntries[0];
409 }
410
411 throw new Error(internals.strings.geminiNotFound);
412 }
413 };