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1 | 'use strict'; | |
2 | ||
3 | const { access, cp, mkdir, readdir, readFile, rm, 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 | ||
10 | // Generators for the Blog | |
11 | ||
12 | const StaticGenerator = require('./generators/static'); | |
13 | const HTMLGenerator = require('./generators/html'); | |
14 | const RSSGenerator = require('./generators/rss'); | |
15 | const TXTGenerator = require('./generators/txt'); | |
16 | ||
17 | // Archiving Methods | |
18 | ||
19 | const GemlogArchiver = require('./archivers/gemlog'); | |
20 | ||
21 | // Remote Handler | |
22 | ||
23 | const Remote = require('./remote'); | |
24 | ||
25 | const internals = { | |
26 | ||
27 | // Promisified functions | |
28 | exec: promisify(exec), | |
29 | ||
30 | debuglog: debuglog('blog'), | |
31 | ||
32 | // constants | |
33 | ||
34 | kFileNotFoundError: 'ENOENT', | |
35 | kGeminiRe: /\.gmi$/i, | |
36 | kMetadataFilename: 'metadata.json', | |
37 | ||
38 | // Strings | |
39 | ||
40 | strings: { | |
41 | geminiNotFound: 'Gemini file was not found in blog directory. Please update.' | |
42 | } | |
43 | }; | |
44 | ||
45 | /** | |
46 | * The Blog class is the blog generator, it's in charge of adding and | |
47 | * updating posts, and handling the publishing. | |
48 | * | |
49 | * @class Blog | |
50 | * @param {Blog.tConfiguration} config the initialization options to | |
51 | * extend the instance | |
52 | */ | |
53 | module.exports = class Blog { | |
54 | ||
55 | constructor(config) { | |
56 | ||
57 | Object.assign(this, config); | |
58 | } | |
59 | ||
60 | /** | |
61 | * Shifts the blog posts, adds the passed path to slot 0, and | |
62 | * generates files. | |
63 | * | |
64 | * @function add | |
65 | * @memberof Blog | |
66 | * @param {string} postLocation the path to the directory containing | |
67 | * the post structure | |
68 | * @return {Promise<undefined>} empty promise, returns no value | |
69 | * @instance | |
70 | */ | |
71 | async add(postLocation) { | |
72 | ||
73 | await this._ensurePostsDirectoryExists(); | |
74 | try { | |
75 | await this.syncDown(); | |
76 | } | |
77 | catch {}; | |
78 | await this._shift(); | |
79 | await this._ensurePostsDirectoryExists(join(this.postsDirectory, '0')); | |
80 | await this.update(postLocation); | |
81 | } | |
82 | ||
83 | /** | |
84 | * Adds the passed path to slot 0, and generates files. | |
85 | * | |
86 | * @function update | |
87 | * @memberof Blog | |
88 | * @param {string} postLocation the path to the directory containing | |
89 | * the post structure | |
90 | * @return {Promise<undefined>} empty promise, returns no value | |
91 | * @instance | |
92 | */ | |
93 | async update(postLocation) { | |
94 | ||
95 | try { | |
96 | await this.syncDown(); | |
97 | } | |
98 | catch {}; | |
99 | const metadata = await this._getMetadata(); | |
100 | await this._ensurePostsDirectoryExists(); | |
101 | await this._copyPost(postLocation); | |
102 | await this._writeMetadata(metadata); | |
103 | ||
104 | await this._archive(postLocation); | |
105 | ||
106 | await this.generate(); | |
107 | try { | |
108 | await this.syncUp(); | |
109 | } | |
110 | catch {}; | |
111 | } | |
112 | ||
113 | /** | |
114 | * Publishes the files to a static host. | |
115 | * | |
116 | * @function publish | |
117 | * @memberof Blog | |
118 | * @return {Promise<undefined>} empty promise, returns no value | |
119 | * @instance | |
120 | */ | |
121 | async publish(bucket) { | |
122 | ||
123 | internals.debuglog(`Publishing to ${bucket}`); | |
124 | try { | |
125 | await internals.exec('which aws'); | |
126 | } | |
127 | catch (err) { | |
128 | console.error('Please install and configure AWS CLI to publish.'); | |
129 | } | |
130 | ||
131 | try { | |
132 | await internals.exec(`aws s3 sync --acl public-read --delete ${this.staticDirectory} s3://${bucket}`); | |
133 | await internals.exec(`aws s3 cp --content-type 'text/plain; charset=utf-8 ' --acl public-read ${this.staticDirectory}/index.txt s3://${bucket}`); | |
134 | } | |
135 | catch (err) { | |
136 | console.error('Failed to publish'); | |
137 | console.error(err.stderr); | |
138 | } | |
139 | ||
140 | internals.debuglog('Finished publishing'); | |
141 | } | |
142 | ||
143 | /** | |
144 | * Publishes the archive to a host using rsync. Currently assumes | |
145 | * gemlog archive. | |
146 | * | |
147 | * @function publishArchive | |
148 | * @memberof Blog | |
149 | * @return {Promise<undefined>} empty promise, returns no value | |
150 | * @instance | |
151 | */ | |
152 | async publishArchive(host) { | |
153 | ||
154 | internals.debuglog(`Publishing archive to ${host}`); | |
155 | try { | |
156 | await internals.exec('which rsync'); | |
157 | } | |
158 | catch (err) { | |
159 | console.error('Please install rsync to publish the archive.'); | |
160 | } | |
161 | ||
162 | try { | |
163 | const gemlogPath = resolve(join(__dirname, '../', '.gemlog')); | |
164 | internals.debuglog(`Reading archive from ${gemlogPath}`); | |
165 | await internals.exec(`rsync -r ${gemlogPath}/ ${host}`); | |
166 | } | |
167 | catch (err) { | |
168 | console.error('Failed to publish archive'); | |
169 | console.error(err.stderr); | |
170 | } | |
171 | ||
172 | internals.debuglog('Finished publishing'); | |
173 | } | |
174 | ||
175 | /** | |
176 | * Adds a remote | |
177 | * | |
178 | * @function addRemote | |
179 | * @memberof Blog | |
180 | * @return {Promise<undefined>} empty promise, returns no value | |
181 | * @instance | |
182 | */ | |
183 | async addRemote(remote) { | |
184 | await Remote.add(this.remoteConfig, remote) | |
185 | } | |
186 | ||
187 | /** | |
188 | * Removes a remote | |
189 | * | |
190 | * @function removeRemote | |
191 | * @memberof Blog | |
192 | * @return {Promise<undefined>} empty promise, returns no value | |
193 | * @instance | |
194 | */ | |
195 | async removeRemote() { | |
196 | await Remote.remove(this.remoteConfig) | |
197 | } | |
198 | ||
199 | ||
200 | /** | |
201 | * Pulls the posts and archive from the remote | |
202 | * | |
203 | * @function syncDown | |
204 | * @memberof Blog | |
205 | * @return {Promise<undefined>} empty promise, returns no value | |
206 | * @instance | |
207 | */ | |
208 | async syncDown() { | |
209 | await Remote.syncDown(this.remoteConfig, this.blogDirectory) | |
210 | } | |
211 | ||
212 | /** | |
213 | * Pushes the posts and archive to the remote | |
214 | * | |
215 | * @function syncUp | |
216 | * @memberof Blog | |
217 | * @return {Promise<undefined>} empty promise, returns no value | |
218 | * @instance | |
219 | */ | |
220 | async syncUp() { | |
221 | await Remote.syncUp(this.remoteConfig, this.blogDirectory) | |
222 | } | |
223 | ||
224 | // Parses Gemini for each page, copies assets and generates index. | |
225 | ||
226 | async generate() { | |
227 | ||
228 | internals.debuglog('Generating output'); | |
229 | ||
230 | const posts = await this._readPosts(); | |
231 | ||
232 | await StaticGenerator(this.postsDirectory, this.staticDirectory, posts); | |
233 | await HTMLGenerator(this.templatesDirectory, this.staticDirectory, posts); | |
234 | await RSSGenerator(this.templatesDirectory, this.staticDirectory, posts); | |
235 | await TXTGenerator(this.templatesDirectory, this.staticDirectory, posts); | |
236 | ||
237 | await GemlogArchiver(this.archiveDirectory); | |
238 | } | |
239 | ||
240 | // Reads the posts into an array | |
241 | ||
242 | async _readPosts() { | |
243 | ||
244 | internals.debuglog('Reading posts'); | |
245 | const posts = []; | |
246 | ||
247 | for (let i = 0; i < this.maxPosts; ++i) { | |
248 | try { | |
249 | posts.push(await this._readPost(i)); | |
250 | } | |
251 | catch (error) { | |
252 | if (error.code === internals.kFileNotFoundError) { | |
253 | internals.debuglog(`Skipping ${i}`); | |
254 | continue; | |
255 | } | |
256 | ||
257 | throw error; | |
258 | } | |
259 | } | |
260 | ||
261 | return posts; | |
262 | } | |
263 | ||
264 | // Reads an individual post | |
265 | ||
266 | async _readPost(index=0) { | |
267 | const postSourcePath = join(this.postsDirectory, `${index}`); | |
268 | ||
269 | internals.debuglog(`Reading ${postSourcePath}`); | |
270 | ||
271 | await access(postSourcePath); | |
272 | ||
273 | const metadata = await this._getMetadata(index); | |
274 | ||
275 | const postContentPath = await this._findBlogContent(postSourcePath); | |
276 | internals.debuglog(`Reading ${postContentPath}`); | |
277 | const postContent = await readFile(postContentPath, { encoding: 'utf8' }); | |
278 | ||
279 | internals.debuglog('Parsing Gemini'); | |
280 | return { | |
281 | ...metadata, | |
282 | location: postSourcePath, | |
283 | index, | |
284 | html: RenderGemini(ParseGemini(postContent)), | |
285 | raw: postContent | |
286 | }; | |
287 | } | |
288 | ||
289 | // Shift the posts, delete any remainder. | |
290 | ||
291 | async _shift() { | |
292 | ||
293 | ||
294 | for (let i = this.maxPosts - 1; i >= 1; --i) { | |
295 | const targetPath = join(this.postsDirectory, `${i}`); | |
296 | const sourcePath = join(this.postsDirectory, `${i - 1}`); | |
297 | ||
298 | try { | |
299 | internals.debuglog(`Archiving ${targetPath}`); | |
300 | await rm(targetPath, { recursive: true, force: true }); | |
301 | await access(sourcePath); // check the source path | |
302 | ||
303 | internals.debuglog(`Shifting blog post ${sourcePath} to ${targetPath}`); | |
304 | await cp(sourcePath, targetPath, { recursive: true }); | |
305 | } | |
306 | catch (error) { | |
307 | if (error.code === internals.kFileNotFoundError) { | |
308 | internals.debuglog(`Skipping ${sourcePath}: Does not exist.`); | |
309 | continue; | |
310 | } | |
311 | ||
312 | throw error; | |
313 | } | |
314 | } | |
315 | } | |
316 | ||
317 | // Moves older posts to the archive | |
318 | ||
319 | async _archive() { | |
320 | internals.debuglog('Archiving post'); | |
321 | const post = await this._readPost(0); | |
322 | await this._ensureDirectoryExists(this.archiveDirectory); | |
323 | ||
324 | const targetPath = join(this.archiveDirectory, post.id); | |
325 | ||
326 | internals.debuglog(`Removing ${targetPath}`); | |
327 | await rm(targetPath, { recursive: true, force: true }); | |
328 | internals.debuglog(`Adding ${post.location} to ${targetPath}`); | |
329 | await this._ensureDirectoryExists(targetPath); | |
330 | await cp(post.location, targetPath, { recursive: true }); | |
331 | internals.debuglog(`Added ${post.location} to ${targetPath}`); | |
332 | } | |
333 | ||
334 | // Attempts to read existing metadata. Otherwise generates new set. | |
335 | ||
336 | async _getMetadata(index = 0) { | |
337 | ||
338 | const metadataTarget = join(this.postsDirectory, String(index), internals.kMetadataFilename); | |
339 | ||
340 | try { | |
341 | internals.debuglog(`Looking for metadata at ${metadataTarget}`); | |
342 | return JSON.parse(await readFile(metadataTarget, { encoding: 'utf8' })); | |
343 | } | |
344 | catch (e) { | |
345 | internals.debuglog(`Metadata not found or unreadable. Generating new set.`); | |
346 | const createdOn = Date.now(); | |
347 | const metadata = { | |
348 | id: String(createdOn), | |
349 | createdOn | |
350 | }; | |
351 | ||
352 | return metadata; | |
353 | } | |
354 | } | |
355 | ||
356 | // Writes metadata. Assumes post 0 since it only gets written | |
357 | // on create | |
358 | ||
359 | async _writeMetadata(metadata) { | |
360 | ||
361 | const metadataTarget = join(this.postsDirectory, '0', internals.kMetadataFilename); | |
362 | internals.debuglog(`Writing ${metadataTarget}`); | |
363 | await writeFile(metadataTarget, JSON.stringify(metadata, null, 2)); | |
364 | } | |
365 | ||
366 | // Copies a post directory to the latest slot. | |
367 | ||
368 | async _copyPost(postLocation) { | |
369 | ||
370 | const targetPath = join(this.postsDirectory, '0'); | |
371 | const postName = basename(postLocation); | |
372 | const targetPost = join(targetPath, postName); | |
373 | ||
374 | internals.debuglog(`Removing ${targetPath}`); | |
375 | await rm(targetPath, { recursive: true, force: true }); | |
376 | await this._ensureDirectoryExists(targetPath); | |
377 | internals.debuglog(`Adding ${postLocation} to ${targetPost}`); | |
378 | await cp(postLocation, targetPost, { recursive: true }); | |
379 | internals.debuglog(`Added ${postLocation} to ${targetPath}`); | |
380 | } | |
381 | ||
382 | // Ensures a directory exists. | |
383 | ||
384 | async _ensureDirectoryExists(directory) { | |
385 | ||
386 | internals.debuglog(`Checking if ${directory} exists.`); | |
387 | try { | |
388 | await access(directory); | |
389 | } | |
390 | catch (error) { | |
391 | if (error.code === internals.kFileNotFoundError) { | |
392 | internals.debuglog(`Creating ${directory}`); | |
393 | await mkdir(directory, { recursive: true }); | |
394 | return; | |
395 | } | |
396 | ||
397 | throw error; | |
398 | } | |
399 | } | |
400 | ||
401 | // Ensures posts directory exists | |
402 | ||
403 | async _ensurePostsDirectoryExists() { | |
404 | ||
405 | return this._ensureDirectoryExists(this.postsDirectory); | |
406 | } | |
407 | ||
408 | // Looks for a `.gmi` file in the blog directory, and returns the path | |
409 | ||
410 | async _findBlogContent(directory) { | |
411 | ||
412 | const entries = await readdir(directory); | |
413 | ||
414 | const geminiEntries = entries | |
415 | .filter((entry) => internals.kGeminiRe.test(entry)) | |
416 | .map((entry) => join(directory, entry)); | |
417 | ||
418 | if (geminiEntries.length > 0) { | |
419 | internals.debuglog(`Found gemini file: ${geminiEntries[0]}`); | |
420 | return geminiEntries[0]; | |
421 | } | |
422 | ||
423 | throw new Error(internals.strings.geminiNotFound); | |
424 | } | |
425 | }; |